proteaaudio 0.7.0.1 → 0.7.1.0
raw patch · 7 files changed
+5532/−5371 lines, 7 filesPVP: major bump suggested
API removals or changes: PVP suggests a major version bump
API changes (from Hackage documentation)
+ Sound.ProteaAudio: sampleFromMemoryPcm :: ByteString -> Int -> Int -> Int -> Float -> IO Sample
- Sound.ProteaAudio: initAudio :: (Int) -> (Int) -> (Int) -> IO ((Bool))
+ Sound.ProteaAudio: initAudio :: Int -> Int -> Int -> IO Bool
- Sound.ProteaAudio: loaderAvailable :: (String) -> IO ((Bool))
+ Sound.ProteaAudio: loaderAvailable :: String -> IO Bool
- Sound.ProteaAudio: sampleFromFile :: (String) -> (Float) -> IO ((Sample))
+ Sound.ProteaAudio: sampleFromFile :: String -> Float -> IO Sample
- Sound.ProteaAudio: soundActive :: IO ((Int))
+ Sound.ProteaAudio: soundActive :: IO Int
- Sound.ProteaAudio: soundLoop :: (Sample) -> (Float) -> (Float) -> (Float) -> (Float) -> IO ()
+ Sound.ProteaAudio: soundLoop :: Sample -> Float -> Float -> Float -> Float -> IO ()
- Sound.ProteaAudio: soundPlay :: (Sample) -> (Float) -> (Float) -> (Float) -> (Float) -> IO ()
+ Sound.ProteaAudio: soundPlay :: Sample -> Float -> Float -> Float -> Float -> IO ()
- Sound.ProteaAudio: soundStop :: (Sample) -> IO ((Bool))
+ Sound.ProteaAudio: soundStop :: Sample -> IO Bool
- Sound.ProteaAudio: soundUpdate :: (Sample) -> (Float) -> (Float) -> (Float) -> (Float) -> IO ((Bool))
+ Sound.ProteaAudio: soundUpdate :: Sample -> Float -> Float -> Float -> Float -> IO Bool
- Sound.ProteaAudio: volume :: (Float) -> (Float) -> IO ()
+ Sound.ProteaAudio: volume :: Float -> Float -> IO ()
Files
- CHANGELOG.md +7/−0
- README.md +6/−0
- Sound/ProteaAudio.chs +23/−1
- cbits/proteaaudio_binding.cpp +30/−18
- cbits/proteaaudio_binding.h +1/−0
- cbits/stb_vorbis.c +5462/−5349
- proteaaudio.cabal +3/−3
CHANGELOG.md view
@@ -1,3 +1,10 @@+# 0.7.1.0+- add sampleFromMemoryPcm+- update stb_vorbis to v1.14++# 0.7.0.1+- better haddock+ # 0.7.0 - use ByteString for in-memory sample loading - fix: c++ mixer init caused segfaults sometimes
README.md view
@@ -6,6 +6,12 @@ - Macintosh OS X *(CoreAudio)* - Windows *(DirectSound)* +Supported audio formats:+- Wav+- Ogg+- Raw linear PCM++Samples can be loaded from file or memory. # Example
Sound/ProteaAudio.chs view
@@ -24,6 +24,7 @@ -- * Sample Loading loaderAvailable,+ sampleFromMemoryPcm, sampleFromMemoryWav, sampleFromMemoryOgg, sampleFromFile,@@ -44,7 +45,7 @@ -- | Initializes the audio system.-{#fun initAudio +{#fun initAudio { `Int' -- ^ the maximum number of sounds that are played parallely. Computation time is linearly correlated to this factor. , `Int' -- ^ sample frequency of the playback in Hz. 22050 corresponds to FM radio 44100 is CD quality. Computation time is linearly correlated to this factor. , `Int' -- ^ the number of bytes that are sent to the sound card at once. Low numbers lead to smaller latencies but need more computation time (thread switches). If a too small number is chosen, the sounds might not be played continuously. The default value 512 guarantees a good latency below 40 ms at 22050 Hz sample frequency.@@ -63,6 +64,17 @@ #} +-- | Loads raw linear pcm sound sample from memory buffer.+{#fun _sampleFromMemoryPcm+ { id `Ptr CChar' -- ^ memory buffer pointer+ , `Int' -- ^ memory buffer size in bytes+ , `Int' -- ^ number of channels, e.g. 1 for mono, 2 for stereo.+ , `Int' -- ^ sample rate, i.e. 44100 Hz+ , `Int' -- ^ bits per sample, i.e. 8/16/32+ , `Float' -- ^ volume+ } -> `Sample' Sample -- ^ returns handle+#}+ -- | Loads wav sound sample from memory buffer. {#fun _sampleFromMemoryWav { id `Ptr CChar' -- ^ memory buffer pointer@@ -78,6 +90,16 @@ , `Float' -- ^ volume } -> `Sample' Sample -- ^ returns handle #}++-- | Loads raw linear pcm sound sample from memory buffer.+sampleFromMemoryPcm :: ByteString -- ^ pcm sample data; array of pcm samples (signed 8 bit int, signed 16 bit int or 32 bit float)+ -> Int -- ^ number of channels, e.g. 1 for mono, 2 for stereo.+ -> Int -- ^ sample rate, i.e. 44100 Hz+ -> Int -- ^ bits per sample, i.e. 8/16/32+ -> Float -- ^ volume+ -> IO Sample -- ^ return sample handle+sampleFromMemoryPcm pcmData channels sampleRate bitsPerSample volume =+ useAsCStringLen pcmData $ \(ptr, size) -> _sampleFromMemoryPcm ptr size channels sampleRate bitsPerSample volume -- | Loads wav sound sample from memory buffer. sampleFromMemoryWav :: ByteString -- ^ wav sample data
cbits/proteaaudio_binding.cpp view
@@ -25,13 +25,13 @@ static AudioSample* loadWavFromMemory(unsigned char * ptr, size_t len) { MEM_FILE* fp = new MEM_FILE();- if (!fp) return 0;- fp->data = ptr;- fp->size = len;- fp->pos = 0;- AudioSample * pSample = AudioSample::readWav((FILE*)fp, mem_fread);- delete fp;- return pSample;+ if (!fp) return 0;+ fp->data = ptr;+ fp->size = len;+ fp->pos = 0;+ AudioSample * pSample = AudioSample::readWav((FILE*)fp, mem_fread);+ delete fp;+ return pSample; } extern "C" {@@ -39,17 +39,17 @@ }; static AudioSample* loadOggFromMemory(unsigned char * file_data_ptr, size_t file_data_len) {- int channels, sampleRate;- short *decoded;- int len = stb_vorbis_decode_memory(file_data_ptr, file_data_len, &channels, &sampleRate, &decoded);- if(len<0) return 0;- // convert to AudioSample:- unsigned int size = len*channels*sizeof(short);- unsigned char * data = new unsigned char[size];- if(!data) return 0;- memcpy(data,decoded, size);- free(decoded);- return new AudioSample(data, size, channels, sampleRate, 16);+ int channels, sampleRate;+ short *decoded;+ int len = stb_vorbis_decode_memory(file_data_ptr, file_data_len, &channels, &sampleRate, &decoded);+ if(len<0) return 0;+ // convert to AudioSample:+ unsigned int size = len*channels*sizeof(short);+ unsigned char * data = new unsigned char[size];+ if(!data) return 0;+ memcpy(data,decoded, size);+ free(decoded);+ return new AudioSample(data, size, channels, sampleRate, 16); } @@ -82,6 +82,18 @@ return (int)audio.sampleFromFile(filename, volume); } +sample_t _sampleFromMemoryPcm(char *pcm_data, int size, int channels, int sampleRate, int bitsPerSample, float volume) {+ DeviceAudio & audio = DeviceAudio::singleton();+ if((&audio) == 0) return 0;+ unsigned char * data = new unsigned char[size];+ if(!data) return 0;+ memcpy(data, pcm_data, size);+ AudioSample * pSample = new AudioSample(data, size, channels, sampleRate, bitsPerSample);+ if(!pSample) return 0;+ unsigned int ret = audio.sampleFromMemory(*pSample, volume);+ delete pSample;+ return (int)ret;+} sample_t _sampleFromMemoryWav(char *data, int size, float volume) { DeviceAudio & audio = DeviceAudio::singleton(); if((&audio) == 0) return 0;
cbits/proteaaudio_binding.h view
@@ -8,6 +8,7 @@ void finishAudio(); int loaderAvailable(char* suffix); void volume(float left, float right);+sample_t _sampleFromMemoryPcm(char *data, int size, int channels, int sampleRate, int bitsPerSample, float volume); sample_t _sampleFromMemoryWav(char *data, int size, float volume); sample_t _sampleFromMemoryOgg(char *data, int size, float volume); sample_t sampleFromFile(char* filename, float volume);
cbits/stb_vorbis.c view
@@ -1,5349 +1,5462 @@-// Ogg Vorbis I audio decoder -- version 0.99996 -// -// Written in April 2007 by Sean Barrett, sponsored by RAD Game Tools. -// -// Placed in the public domain April 2007 by the author: no copyright is -// claimed, and you may use it for any purpose you like. -// -// No warranty for any purpose is expressed or implied by the author (nor -// by RAD Game Tools). Report bugs and send enhancements to the author. -// -// Get the latest version and other information at: -// http://nothings.org/stb_vorbis/ - - -// Todo: -// -// - seeking (note you can seek yourself using the pushdata API) -// -// Limitations: -// -// - floor 0 not supported (used in old ogg vorbis files) -// - lossless sample-truncation at beginning ignored -// - cannot concatenate multiple vorbis streams -// - sample positions are 32-bit, limiting seekable 192Khz -// files to around 6 hours (Ogg supports 64-bit) -// -// All of these limitations may be removed in future versions. - - -////////////////////////////////////////////////////////////////////////////// -// -// HEADER BEGINS HERE -// - -#ifndef STB_VORBIS_INCLUDE_STB_VORBIS_H -#define STB_VORBIS_INCLUDE_STB_VORBIS_H - -#if defined(STB_VORBIS_NO_CRT) && !defined(STB_VORBIS_NO_STDIO) -#define STB_VORBIS_NO_STDIO 1 -#endif - -#ifndef STB_VORBIS_NO_STDIO -#include <stdio.h> -#endif - -#ifdef __cplusplus -extern "C" { -#endif - -/////////// THREAD SAFETY - -// Individual stb_vorbis* handles are not thread-safe; you cannot decode from -// them from multiple threads at the same time. However, you can have multiple -// stb_vorbis* handles and decode from them independently in multiple thrads. - - -/////////// MEMORY ALLOCATION - -// normally stb_vorbis uses malloc() to allocate memory at startup, -// and alloca() to allocate temporary memory during a frame on the -// stack. (Memory consumption will depend on the amount of setup -// data in the file and how you set the compile flags for speed -// vs. size. In my test files the maximal-size usage is ~150KB.) -// -// You can modify the wrapper functions in the source (setup_malloc, -// setup_temp_malloc, temp_malloc) to change this behavior, or you -// can use a simpler allocation model: you pass in a buffer from -// which stb_vorbis will allocate _all_ its memory (including the -// temp memory). "open" may fail with a VORBIS_outofmem if you -// do not pass in enough data; there is no way to determine how -// much you do need except to succeed (at which point you can -// query get_info to find the exact amount required. yes I know -// this is lame). -// -// If you pass in a non-NULL buffer of the type below, allocation -// will occur from it as described above. Otherwise just pass NULL -// to use malloc()/alloca() - -typedef struct -{ - char *alloc_buffer; - int alloc_buffer_length_in_bytes; -} stb_vorbis_alloc; - - -/////////// FUNCTIONS USEABLE WITH ALL INPUT MODES - -typedef struct stb_vorbis stb_vorbis; - -typedef struct -{ - unsigned int sample_rate; - int channels; - - unsigned int setup_memory_required; - unsigned int setup_temp_memory_required; - unsigned int temp_memory_required; - - int max_frame_size; -} stb_vorbis_info; - -// get general information about the file -extern stb_vorbis_info stb_vorbis_get_info(stb_vorbis *f); - -// get the last error detected (clears it, too) -extern int stb_vorbis_get_error(stb_vorbis *f); - -// close an ogg vorbis file and free all memory in use -extern void stb_vorbis_close(stb_vorbis *f); - -// this function returns the offset (in samples) from the beginning of the -// file that will be returned by the next decode, if it is known, or -1 -// otherwise. after a flush_pushdata() call, this may take a while before -// it becomes valid again. -// NOT WORKING YET after a seek with PULLDATA API -extern int stb_vorbis_get_sample_offset(stb_vorbis *f); - -// returns the current seek point within the file, or offset from the beginning -// of the memory buffer. In pushdata mode it returns 0. -extern unsigned int stb_vorbis_get_file_offset(stb_vorbis *f); - -/////////// PUSHDATA API - -#ifndef STB_VORBIS_NO_PUSHDATA_API - -// this API allows you to get blocks of data from any source and hand -// them to stb_vorbis. you have to buffer them; stb_vorbis will tell -// you how much it used, and you have to give it the rest next time; -// and stb_vorbis may not have enough data to work with and you will -// need to give it the same data again PLUS more. Note that the Vorbis -// specification does not bound the size of an individual frame. - -extern stb_vorbis *stb_vorbis_open_pushdata( - unsigned char *datablock, int datablock_length_in_bytes, - int *datablock_memory_consumed_in_bytes, - int *error, - stb_vorbis_alloc *alloc_buffer); -// create a vorbis decoder by passing in the initial data block containing -// the ogg&vorbis headers (you don't need to do parse them, just provide -// the first N bytes of the file--you're told if it's not enough, see below) -// on success, returns an stb_vorbis *, does not set error, returns the amount of -// data parsed/consumed on this call in *datablock_memory_consumed_in_bytes; -// on failure, returns NULL on error and sets *error, does not change *datablock_memory_consumed -// if returns NULL and *error is VORBIS_need_more_data, then the input block was -// incomplete and you need to pass in a larger block from the start of the file - -extern int stb_vorbis_decode_frame_pushdata( - stb_vorbis *f, unsigned char *datablock, int datablock_length_in_bytes, - int *channels, // place to write number of float * buffers - float ***output, // place to write float ** array of float * buffers - int *samples // place to write number of output samples - ); -// decode a frame of audio sample data if possible from the passed-in data block -// -// return value: number of bytes we used from datablock -// possible cases: -// 0 bytes used, 0 samples output (need more data) -// N bytes used, 0 samples output (resynching the stream, keep going) -// N bytes used, M samples output (one frame of data) -// note that after opening a file, you will ALWAYS get one N-bytes,0-sample -// frame, because Vorbis always "discards" the first frame. -// -// Note that on resynch, stb_vorbis will rarely consume all of the buffer, -// instead only datablock_length_in_bytes-3 or less. This is because it wants -// to avoid missing parts of a page header if they cross a datablock boundary, -// without writing state-machiney code to record a partial detection. -// -// The number of channels returned are stored in *channels (which can be -// NULL--it is always the same as the number of channels reported by -// get_info). *output will contain an array of float* buffers, one per -// channel. In other words, (*output)[0][0] contains the first sample from -// the first channel, and (*output)[1][0] contains the first sample from -// the second channel. - -extern void stb_vorbis_flush_pushdata(stb_vorbis *f); -// inform stb_vorbis that your next datablock will not be contiguous with -// previous ones (e.g. you've seeked in the data); future attempts to decode -// frames will cause stb_vorbis to resynchronize (as noted above), and -// once it sees a valid Ogg page (typically 4-8KB, as large as 64KB), it -// will begin decoding the _next_ frame. -// -// if you want to seek using pushdata, you need to seek in your file, then -// call stb_vorbis_flush_pushdata(), then start calling decoding, then once -// decoding is returning you data, call stb_vorbis_get_sample_offset, and -// if you don't like the result, seek your file again and repeat. -#endif - - -////////// PULLING INPUT API - -#ifndef STB_VORBIS_NO_PULLDATA_API -// This API assumes stb_vorbis is allowed to pull data from a source-- -// either a block of memory containing the _entire_ vorbis stream, or a -// FILE * that you or it create, or possibly some other reading mechanism -// if you go modify the source to replace the FILE * case with some kind -// of callback to your code. (But if you don't support seeking, you may -// just want to go ahead and use pushdata.) - -#if !defined(STB_VORBIS_NO_STDIO) && !defined(STB_VORBIS_NO_INTEGER_CONVERSION) -extern int stb_vorbis_decode_filename(char *filename, int *channels, int* sample_rate, short **output); -#endif -extern int stb_vorbis_decode_memory(unsigned char *mem, int len, int *channels, int* sample_rate, short **output); -// decode an entire file and output the data interleaved into a malloc()ed -// buffer stored in *output. The return value is the number of samples -// decoded, or -1 if the file could not be opened or was not an ogg vorbis file. -// When you're done with it, just free() the pointer returned in *output. - -extern stb_vorbis * stb_vorbis_open_memory(unsigned char *data, int len, - int *error, stb_vorbis_alloc *alloc_buffer); -// create an ogg vorbis decoder from an ogg vorbis stream in memory (note -// this must be the entire stream!). on failure, returns NULL and sets *error - -#ifndef STB_VORBIS_NO_STDIO -extern stb_vorbis * stb_vorbis_open_filename(char *filename, - int *error, stb_vorbis_alloc *alloc_buffer); -// create an ogg vorbis decoder from a filename via fopen(). on failure, -// returns NULL and sets *error (possibly to VORBIS_file_open_failure). - -extern stb_vorbis * stb_vorbis_open_file(FILE *f, int close_handle_on_close, - int *error, stb_vorbis_alloc *alloc_buffer); -// create an ogg vorbis decoder from an open FILE *, looking for a stream at -// the _current_ seek point (ftell). on failure, returns NULL and sets *error. -// note that stb_vorbis must "own" this stream; if you seek it in between -// calls to stb_vorbis, it will become confused. Morever, if you attempt to -// perform stb_vorbis_seek_*() operations on this file, it will assume it -// owns the _entire_ rest of the file after the start point. Use the next -// function, stb_vorbis_open_file_section(), to limit it. - -extern stb_vorbis * stb_vorbis_open_file_section(FILE *f, int close_handle_on_close, - int *error, stb_vorbis_alloc *alloc_buffer, unsigned int len); -// create an ogg vorbis decoder from an open FILE *, looking for a stream at -// the _current_ seek point (ftell); the stream will be of length 'len' bytes. -// on failure, returns NULL and sets *error. note that stb_vorbis must "own" -// this stream; if you seek it in between calls to stb_vorbis, it will become -// confused. -#endif - -extern int stb_vorbis_seek_frame(stb_vorbis *f, unsigned int sample_number); -extern int stb_vorbis_seek(stb_vorbis *f, unsigned int sample_number); -// NOT WORKING YET -// these functions seek in the Vorbis file to (approximately) 'sample_number'. -// after calling seek_frame(), the next call to get_frame_*() will include -// the specified sample. after calling stb_vorbis_seek(), the next call to -// stb_vorbis_get_samples_* will start with the specified sample. If you -// do not need to seek to EXACTLY the target sample when using get_samples_*, -// you can also use seek_frame(). - -extern void stb_vorbis_seek_start(stb_vorbis *f); -// this function is equivalent to stb_vorbis_seek(f,0), but it -// actually works - -extern unsigned int stb_vorbis_stream_length_in_samples(stb_vorbis *f); -extern float stb_vorbis_stream_length_in_seconds(stb_vorbis *f); -// these functions return the total length of the vorbis stream - -extern int stb_vorbis_get_frame_float(stb_vorbis *f, int *channels, float ***output); -// decode the next frame and return the number of samples. the number of -// channels returned are stored in *channels (which can be NULL--it is always -// the same as the number of channels reported by get_info). *output will -// contain an array of float* buffers, one per channel. These outputs will -// be overwritten on the next call to stb_vorbis_get_frame_*. -// -// You generally should not intermix calls to stb_vorbis_get_frame_*() -// and stb_vorbis_get_samples_*(), since the latter calls the former. - -#ifndef STB_VORBIS_NO_INTEGER_CONVERSION -extern int stb_vorbis_get_frame_short_interleaved(stb_vorbis *f, int num_c, short *buffer, int num_shorts); -extern int stb_vorbis_get_frame_short (stb_vorbis *f, int num_c, short **buffer, int num_samples); -#endif -// decode the next frame and return the number of samples per channel. the -// data is coerced to the number of channels you request according to the -// channel coercion rules (see below). You must pass in the size of your -// buffer(s) so that stb_vorbis will not overwrite the end of the buffer. -// The maximum buffer size needed can be gotten from get_info(); however, -// the Vorbis I specification implies an absolute maximum of 4096 samples -// per channel. Note that for interleaved data, you pass in the number of -// shorts (the size of your array), but the return value is the number of -// samples per channel, not the total number of samples. - -// Channel coercion rules: -// Let M be the number of channels requested, and N the number of channels present, -// and Cn be the nth channel; let stereo L be the sum of all L and center channels, -// and stereo R be the sum of all R and center channels (channel assignment from the -// vorbis spec). -// M N output -// 1 k sum(Ck) for all k -// 2 * stereo L, stereo R -// k l k > l, the first l channels, then 0s -// k l k <= l, the first k channels -// Note that this is not _good_ surround etc. mixing at all! It's just so -// you get something useful. - -extern int stb_vorbis_get_samples_float_interleaved(stb_vorbis *f, int channels, float *buffer, int num_floats); -extern int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, int num_samples); -// gets num_samples samples, not necessarily on a frame boundary--this requires -// buffering so you have to supply the buffers. DOES NOT APPLY THE COERCION RULES. -// Returns the number of samples stored per channel; it may be less than requested -// at the end of the file. If there are no more samples in the file, returns 0. - -#ifndef STB_VORBIS_NO_INTEGER_CONVERSION -extern int stb_vorbis_get_samples_short_interleaved(stb_vorbis *f, int channels, short *buffer, int num_shorts); -extern int stb_vorbis_get_samples_short(stb_vorbis *f, int channels, short **buffer, int num_samples); -#endif -// gets num_samples samples, not necessarily on a frame boundary--this requires -// buffering so you have to supply the buffers. Applies the coercion rules above -// to produce 'channels' channels. Returns the number of samples stored per channel; -// it may be less than requested at the end of the file. If there are no more -// samples in the file, returns 0. - -#endif - -//////// ERROR CODES - -enum STBVorbisError -{ - VORBIS__no_error, - - VORBIS_need_more_data=1, // not a real error - - VORBIS_invalid_api_mixing, // can't mix API modes - VORBIS_outofmem, // not enough memory - VORBIS_feature_not_supported, // uses floor 0 - VORBIS_too_many_channels, // STB_VORBIS_MAX_CHANNELS is too small - VORBIS_file_open_failure, // fopen() failed - VORBIS_seek_without_length, // can't seek in unknown-length file - - VORBIS_unexpected_eof=10, // file is truncated? - VORBIS_seek_invalid, // seek past EOF - - // decoding errors (corrupt/invalid stream) -- you probably - // don't care about the exact details of these - - // vorbis errors: - VORBIS_invalid_setup=20, - VORBIS_invalid_stream, - - // ogg errors: - VORBIS_missing_capture_pattern=30, - VORBIS_invalid_stream_structure_version, - VORBIS_continued_packet_flag_invalid, - VORBIS_incorrect_stream_serial_number, - VORBIS_invalid_first_page, - VORBIS_bad_packet_type, - VORBIS_cant_find_last_page, - VORBIS_seek_failed, -}; - - -#ifdef __cplusplus -} -#endif - -#endif // STB_VORBIS_INCLUDE_STB_VORBIS_H -// -// HEADER ENDS HERE -// -////////////////////////////////////////////////////////////////////////////// - -#ifndef STB_VORBIS_HEADER_ONLY - -// global configuration settings (e.g. set these in the project/makefile), -// or just set them in this file at the top (although ideally the first few -// should be visible when the header file is compiled too, although it's not -// crucial) - -// STB_VORBIS_NO_PUSHDATA_API -// does not compile the code for the various stb_vorbis_*_pushdata() -// functions -// #define STB_VORBIS_NO_PUSHDATA_API - -// STB_VORBIS_NO_PULLDATA_API -// does not compile the code for the non-pushdata APIs -// #define STB_VORBIS_NO_PULLDATA_API - -// STB_VORBIS_NO_STDIO -// does not compile the code for the APIs that use FILE *s internally -// or externally (implied by STB_VORBIS_NO_PULLDATA_API) -// #define STB_VORBIS_NO_STDIO - -// STB_VORBIS_NO_INTEGER_CONVERSION -// does not compile the code for converting audio sample data from -// float to integer (implied by STB_VORBIS_NO_PULLDATA_API) -// #define STB_VORBIS_NO_INTEGER_CONVERSION - -// STB_VORBIS_NO_FAST_SCALED_FLOAT -// does not use a fast float-to-int trick to accelerate float-to-int on -// most platforms which requires endianness be defined correctly. -//#define STB_VORBIS_NO_FAST_SCALED_FLOAT - - -// STB_VORBIS_MAX_CHANNELS [number] -// globally define this to the maximum number of channels you need. -// The spec does not put a restriction on channels except that -// the count is stored in a byte, so 255 is the hard limit. -// Reducing this saves about 16 bytes per value, so using 16 saves -// (255-16)*16 or around 4KB. Plus anything other memory usage -// I forgot to account for. Can probably go as low as 8 (7.1 audio), -// 6 (5.1 audio), or 2 (stereo only). -#ifndef STB_VORBIS_MAX_CHANNELS -#define STB_VORBIS_MAX_CHANNELS 16 // enough for anyone? -#endif - -// STB_VORBIS_PUSHDATA_CRC_COUNT [number] -// after a flush_pushdata(), stb_vorbis begins scanning for the -// next valid page, without backtracking. when it finds something -// that looks like a page, it streams through it and verifies its -// CRC32. Should that validation fail, it keeps scanning. But it's -// possible that _while_ streaming through to check the CRC32 of -// one candidate page, it sees another candidate page. This #define -// determines how many "overlapping" candidate pages it can search -// at once. Note that "real" pages are typically ~4KB to ~8KB, whereas -// garbage pages could be as big as 64KB, but probably average ~16KB. -// So don't hose ourselves by scanning an apparent 64KB page and -// missing a ton of real ones in the interim; so minimum of 2 -#ifndef STB_VORBIS_PUSHDATA_CRC_COUNT -#define STB_VORBIS_PUSHDATA_CRC_COUNT 4 -#endif - -// STB_VORBIS_FAST_HUFFMAN_LENGTH [number] -// sets the log size of the huffman-acceleration table. Maximum -// supported value is 24. with larger numbers, more decodings are O(1), -// but the table size is larger so worse cache missing, so you'll have -// to probe (and try multiple ogg vorbis files) to find the sweet spot. -#ifndef STB_VORBIS_FAST_HUFFMAN_LENGTH -#define STB_VORBIS_FAST_HUFFMAN_LENGTH 10 -#endif - -// STB_VORBIS_FAST_BINARY_LENGTH [number] -// sets the log size of the binary-search acceleration table. this -// is used in similar fashion to the fast-huffman size to set initial -// parameters for the binary search - -// STB_VORBIS_FAST_HUFFMAN_INT -// The fast huffman tables are much more efficient if they can be -// stored as 16-bit results instead of 32-bit results. This restricts -// the codebooks to having only 65535 possible outcomes, though. -// (At least, accelerated by the huffman table.) -#ifndef STB_VORBIS_FAST_HUFFMAN_INT -#define STB_VORBIS_FAST_HUFFMAN_SHORT -#endif - -// STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH -// If the 'fast huffman' search doesn't succeed, then stb_vorbis falls -// back on binary searching for the correct one. This requires storing -// extra tables with the huffman codes in sorted order. Defining this -// symbol trades off space for speed by forcing a linear search in the -// non-fast case, except for "sparse" codebooks. -// #define STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH - -// STB_VORBIS_DIVIDES_IN_RESIDUE -// stb_vorbis precomputes the result of the scalar residue decoding -// that would otherwise require a divide per chunk. you can trade off -// space for time by defining this symbol. -// #define STB_VORBIS_DIVIDES_IN_RESIDUE - -// STB_VORBIS_DIVIDES_IN_CODEBOOK -// vorbis VQ codebooks can be encoded two ways: with every case explicitly -// stored, or with all elements being chosen from a small range of values, -// and all values possible in all elements. By default, stb_vorbis expands -// this latter kind out to look like the former kind for ease of decoding, -// because otherwise an integer divide-per-vector-element is required to -// unpack the index. If you define STB_VORBIS_DIVIDES_IN_CODEBOOK, you can -// trade off storage for speed. -//#define STB_VORBIS_DIVIDES_IN_CODEBOOK - -// STB_VORBIS_CODEBOOK_SHORTS -// The vorbis file format encodes VQ codebook floats as ax+b where a and -// b are floating point per-codebook constants, and x is a 16-bit int. -// Normally, stb_vorbis decodes them to floats rather than leaving them -// as 16-bit ints and computing ax+b while decoding. This is a speed/space -// tradeoff; you can save space by defining this flag. -#ifndef STB_VORBIS_CODEBOOK_SHORTS -#define STB_VORBIS_CODEBOOK_FLOATS -#endif - -// STB_VORBIS_DIVIDE_TABLE -// this replaces small integer divides in the floor decode loop with -// table lookups. made less than 1% difference, so disabled by default. - -// STB_VORBIS_NO_INLINE_DECODE -// disables the inlining of the scalar codebook fast-huffman decode. -// might save a little codespace; useful for debugging -// #define STB_VORBIS_NO_INLINE_DECODE - -// STB_VORBIS_NO_DEFER_FLOOR -// Normally we only decode the floor without synthesizing the actual -// full curve. We can instead synthesize the curve immediately. This -// requires more memory and is very likely slower, so I don't think -// you'd ever want to do it except for debugging. -// #define STB_VORBIS_NO_DEFER_FLOOR - - - - -////////////////////////////////////////////////////////////////////////////// - -#ifdef STB_VORBIS_NO_PULLDATA_API - #define STB_VORBIS_NO_INTEGER_CONVERSION - #define STB_VORBIS_NO_STDIO -#endif - -#if defined(STB_VORBIS_NO_CRT) && !defined(STB_VORBIS_NO_STDIO) - #define STB_VORBIS_NO_STDIO 1 -#endif - -#ifndef STB_VORBIS_NO_INTEGER_CONVERSION -#ifndef STB_VORBIS_NO_FAST_SCALED_FLOAT - - // only need endianness for fast-float-to-int, which we don't - // use for pushdata - - #ifndef STB_VORBIS_BIG_ENDIAN - #define STB_VORBIS_ENDIAN 0 - #else - #define STB_VORBIS_ENDIAN 1 - #endif - -#endif -#endif - - -#ifndef STB_VORBIS_NO_STDIO -#include <stdio.h> -#endif - -#ifndef STB_VORBIS_NO_CRT -#include <stdlib.h> -#include <string.h> -#include <assert.h> -#include <math.h> -#if !(defined(__APPLE__) || defined(MACOSX) || defined(macintosh) || defined(Macintosh)) -#include <malloc.h> -#endif -#else -#define NULL 0 -#endif - -#ifndef _MSC_VER - #if __GNUC__ - #define __forceinline inline - #else - #define __forceinline - #endif -#endif - -#if STB_VORBIS_MAX_CHANNELS > 256 -#error "Value of STB_VORBIS_MAX_CHANNELS outside of allowed range" -#endif - -#if STB_VORBIS_FAST_HUFFMAN_LENGTH > 24 -#error "Value of STB_VORBIS_FAST_HUFFMAN_LENGTH outside of allowed range" -#endif - - -#define MAX_BLOCKSIZE_LOG 13 // from specification -#define MAX_BLOCKSIZE (1 << MAX_BLOCKSIZE_LOG) - - -typedef unsigned char uint8; -typedef signed char int8; -typedef unsigned short uint16; -typedef signed short int16; -typedef unsigned int uint32; -typedef signed int int32; - -#ifndef TRUE -#define TRUE 1 -#define FALSE 0 -#endif - -#ifdef STB_VORBIS_CODEBOOK_FLOATS -typedef float codetype; -#else -typedef uint16 codetype; -#endif - -// @NOTE -// -// Some arrays below are tagged "//varies", which means it's actually -// a variable-sized piece of data, but rather than malloc I assume it's -// small enough it's better to just allocate it all together with the -// main thing -// -// Most of the variables are specified with the smallest size I could pack -// them into. It might give better performance to make them all full-sized -// integers. It should be safe to freely rearrange the structures or change -// the sizes larger--nothing relies on silently truncating etc., nor the -// order of variables. - -#define FAST_HUFFMAN_TABLE_SIZE (1 << STB_VORBIS_FAST_HUFFMAN_LENGTH) -#define FAST_HUFFMAN_TABLE_MASK (FAST_HUFFMAN_TABLE_SIZE - 1) - -typedef struct -{ - int dimensions, entries; - uint8 *codeword_lengths; - float minimum_value; - float delta_value; - uint8 value_bits; - uint8 lookup_type; - uint8 sequence_p; - uint8 sparse; - uint32 lookup_values; - codetype *multiplicands; - uint32 *codewords; - #ifdef STB_VORBIS_FAST_HUFFMAN_SHORT - int16 fast_huffman[FAST_HUFFMAN_TABLE_SIZE]; - #else - int32 fast_huffman[FAST_HUFFMAN_TABLE_SIZE]; - #endif - uint32 *sorted_codewords; - int *sorted_values; - int sorted_entries; -} Codebook; - -typedef struct -{ - uint8 order; - uint16 rate; - uint16 bark_map_size; - uint8 amplitude_bits; - uint8 amplitude_offset; - uint8 number_of_books; - uint8 book_list[16]; // varies -} Floor0; - -typedef struct -{ - uint8 partitions; - uint8 partition_class_list[32]; // varies - uint8 class_dimensions[16]; // varies - uint8 class_subclasses[16]; // varies - uint8 class_masterbooks[16]; // varies - int16 subclass_books[16][8]; // varies - uint16 Xlist[31*8+2]; // varies - uint8 sorted_order[31*8+2]; - uint8 neighbors[31*8+2][2]; - uint8 floor1_multiplier; - uint8 rangebits; - int values; -} Floor1; - -typedef union -{ - Floor0 floor0; - Floor1 floor1; -} Floor; - -typedef struct -{ - uint32 begin, end; - uint32 part_size; - uint8 classifications; - uint8 classbook; - uint8 **classdata; - int16 (*residue_books)[8]; -} Residue; - -typedef struct -{ - uint8 magnitude; - uint8 angle; - uint8 mux; -} MappingChannel; - -typedef struct -{ - uint16 coupling_steps; - MappingChannel *chan; - uint8 submaps; - uint8 submap_floor[15]; // varies - uint8 submap_residue[15]; // varies -} Mapping; - -typedef struct -{ - uint8 blockflag; - uint8 mapping; - uint16 windowtype; - uint16 transformtype; -} Mode; - -typedef struct -{ - uint32 goal_crc; // expected crc if match - int bytes_left; // bytes left in packet - uint32 crc_so_far; // running crc - int bytes_done; // bytes processed in _current_ chunk - uint32 sample_loc; // granule pos encoded in page -} CRCscan; - -typedef struct -{ - uint32 page_start, page_end; - uint32 after_previous_page_start; - uint32 first_decoded_sample; - uint32 last_decoded_sample; -} ProbedPage; - -struct stb_vorbis -{ - // user-accessible info - unsigned int sample_rate; - int channels; - - unsigned int setup_memory_required; - unsigned int temp_memory_required; - unsigned int setup_temp_memory_required; - - // input config -#ifndef STB_VORBIS_NO_STDIO - FILE *f; - uint32 f_start; - int close_on_free; -#endif - - uint8 *stream; - uint8 *stream_start; - uint8 *stream_end; - - uint32 stream_len; - - uint8 push_mode; - - uint32 first_audio_page_offset; - - ProbedPage p_first, p_last; - - // memory management - stb_vorbis_alloc alloc; - int setup_offset; - int temp_offset; - - // run-time results - int eof; - enum STBVorbisError error; - - // user-useful data - - // header info - int blocksize[2]; - int blocksize_0, blocksize_1; - int codebook_count; - Codebook *codebooks; - int floor_count; - uint16 floor_types[64]; // varies - Floor *floor_config; - int residue_count; - uint16 residue_types[64]; // varies - Residue *residue_config; - int mapping_count; - Mapping *mapping; - int mode_count; - Mode mode_config[64]; // varies - - uint32 total_samples; - - // decode buffer - float *channel_buffers[STB_VORBIS_MAX_CHANNELS]; - float *outputs [STB_VORBIS_MAX_CHANNELS]; - - float *previous_window[STB_VORBIS_MAX_CHANNELS]; - int previous_length; - - #ifndef STB_VORBIS_NO_DEFER_FLOOR - int16 *finalY[STB_VORBIS_MAX_CHANNELS]; - #else - float *floor_buffers[STB_VORBIS_MAX_CHANNELS]; - #endif - - uint32 current_loc; // sample location of next frame to decode - int current_loc_valid; - - // per-blocksize precomputed data - - // twiddle factors - float *A[2],*B[2],*C[2]; - float *window[2]; - uint16 *bit_reverse[2]; - - // current page/packet/segment streaming info - uint32 serial; // stream serial number for verification - int last_page; - int segment_count; - uint8 segments[255]; - uint8 page_flag; - uint8 bytes_in_seg; - uint8 first_decode; - int next_seg; - int last_seg; // flag that we're on the last segment - int last_seg_which; // what was the segment number of the last seg? - uint32 acc; - int valid_bits; - int packet_bytes; - int end_seg_with_known_loc; - uint32 known_loc_for_packet; - int discard_samples_deferred; - uint32 samples_output; - - // push mode scanning - int page_crc_tests; // only in push_mode: number of tests active; -1 if not searching -#ifndef STB_VORBIS_NO_PUSHDATA_API - CRCscan scan[STB_VORBIS_PUSHDATA_CRC_COUNT]; -#endif - - // sample-access - int channel_buffer_start; - int channel_buffer_end; -}; - -#if defined(STB_VORBIS_NO_PUSHDATA_API) - #define IS_PUSH_MODE(f) FALSE -#elif defined(STB_VORBIS_NO_PULLDATA_API) - #define IS_PUSH_MODE(f) TRUE -#else - #define IS_PUSH_MODE(f) ((f)->push_mode) -#endif - -typedef struct stb_vorbis vorb; - -static int error(vorb *f, enum STBVorbisError e) -{ - f->error = e; - if (!f->eof && e != VORBIS_need_more_data) { - f->error=e; // breakpoint for debugging - } - return 0; -} - - -// these functions are used for allocating temporary memory -// while decoding. if you can afford the stack space, use -// alloca(); otherwise, provide a temp buffer and it will -// allocate out of those. - -#define array_size_required(count,size) (count*(sizeof(void *)+(size))) - -#define temp_alloc(f,size) (f->alloc.alloc_buffer ? setup_temp_malloc(f,size) : alloca(size)) -#ifdef dealloca -#define temp_free(f,p) (f->alloc.alloc_buffer ? 0 : dealloca(size)) -#else -#define temp_free(f,p) 0 -#endif -#define temp_alloc_save(f) ((f)->temp_offset) -#define temp_alloc_restore(f,p) ((f)->temp_offset = (p)) - -#define temp_block_array(f,count,size) make_block_array(temp_alloc(f,array_size_required(count,size)), count, size) - -// given a sufficiently large block of memory, make an array of pointers to subblocks of it -static void *make_block_array(void *mem, int count, int size) -{ - int i; - void ** p = (void **) mem; - char *q = (char *) (p + count); - for (i=0; i < count; ++i) { - p[i] = q; - q += size; - } - return p; -} - -static void *setup_malloc(vorb *f, int sz) -{ - sz = (sz+3) & ~3; - f->setup_memory_required += sz; - if (f->alloc.alloc_buffer) { - void *p = (char *) f->alloc.alloc_buffer + f->setup_offset; - if (f->setup_offset + sz > f->temp_offset) return NULL; - f->setup_offset += sz; - return p; - } - return sz ? malloc(sz) : NULL; -} - -static void setup_free(vorb *f, void *p) -{ - if (f->alloc.alloc_buffer) return; // do nothing; setup mem is not a stack - free(p); -} - -static void *setup_temp_malloc(vorb *f, int sz) -{ - sz = (sz+3) & ~3; - if (f->alloc.alloc_buffer) { - if (f->temp_offset - sz < f->setup_offset) return NULL; - f->temp_offset -= sz; - return (char *) f->alloc.alloc_buffer + f->temp_offset; - } - return malloc(sz); -} - -static void setup_temp_free(vorb *f, void *p, size_t sz) -{ - if (f->alloc.alloc_buffer) { - f->temp_offset += (sz+3)&~3; - return; - } - free(p); -} - -#define CRC32_POLY 0x04c11db7 // from spec - -static uint32 crc_table[256]; -static void crc32_init(void) -{ - int i,j; - uint32 s; - for(i=0; i < 256; i++) { - for (s=i<<24, j=0; j < 8; ++j) - s = (s << 1) ^ (s >= (1<<31) ? CRC32_POLY : 0); - crc_table[i] = s; - } -} - -static __forceinline uint32 crc32_update(uint32 crc, uint8 byte) -{ - return (crc << 8) ^ crc_table[byte ^ (crc >> 24)]; -} - - -// used in setup, and for huffman that doesn't go fast path -static unsigned int bit_reverse(unsigned int n) -{ - n = ((n & 0xAAAAAAAA) >> 1) | ((n & 0x55555555) << 1); - n = ((n & 0xCCCCCCCC) >> 2) | ((n & 0x33333333) << 2); - n = ((n & 0xF0F0F0F0) >> 4) | ((n & 0x0F0F0F0F) << 4); - n = ((n & 0xFF00FF00) >> 8) | ((n & 0x00FF00FF) << 8); - return (n >> 16) | (n << 16); -} - -static float square(float x) -{ - return x*x; -} - -// this is a weird definition of log2() for which log2(1) = 1, log2(2) = 2, log2(4) = 3 -// as required by the specification. fast(?) implementation from stb.h -// @OPTIMIZE: called multiple times per-packet with "constants"; move to setup -static int ilog(int32 n) -{ - static signed char log2_4[16] = { 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4 }; - - // 2 compares if n < 16, 3 compares otherwise (4 if signed or n > 1<<29) - if (n < (1U << 14)) - if (n < (1U << 4)) return 0 + log2_4[n ]; - else if (n < (1U << 9)) return 5 + log2_4[n >> 5]; - else return 10 + log2_4[n >> 10]; - else if (n < (1U << 24)) - if (n < (1U << 19)) return 15 + log2_4[n >> 15]; - else return 20 + log2_4[n >> 20]; - else if (n < (1U << 29)) return 25 + log2_4[n >> 25]; - else if (n < (1U << 31)) return 30 + log2_4[n >> 30]; - else return 0; // signed n returns 0 -} - -#ifndef M_PI - #define M_PI 3.14159265358979323846264f // from CRC -#endif - -// code length assigned to a value with no huffman encoding -#define NO_CODE 255 - -/////////////////////// LEAF SETUP FUNCTIONS ////////////////////////// -// -// these functions are only called at setup, and only a few times -// per file - -static float float32_unpack(uint32 x) -{ - // from the specification - uint32 mantissa = x & 0x1fffff; - uint32 sign = x & 0x80000000; - uint32 exp = (x & 0x7fe00000) >> 21; - double res = sign ? -(double)mantissa : (double)mantissa; - return (float) ldexp((float)res, exp-788); -} - - -// zlib & jpeg huffman tables assume that the output symbols -// can either be arbitrarily arranged, or have monotonically -// increasing frequencies--they rely on the lengths being sorted; -// this makes for a very simple generation algorithm. -// vorbis allows a huffman table with non-sorted lengths. This -// requires a more sophisticated construction, since symbols in -// order do not map to huffman codes "in order". -static void add_entry(Codebook *c, uint32 huff_code, int symbol, int count, int len, uint32 *values) -{ - if (!c->sparse) { - c->codewords [symbol] = huff_code; - } else { - c->codewords [count] = huff_code; - c->codeword_lengths[count] = len; - values [count] = symbol; - } -} - -static int compute_codewords(Codebook *c, uint8 *len, int n, uint32 *values) -{ - int i,k,m=0; - uint32 available[32]; - - memset(available, 0, sizeof(available)); - // find the first entry - for (k=0; k < n; ++k) if (len[k] < NO_CODE) break; - if (k == n) { assert(c->sorted_entries == 0); return TRUE; } - // add to the list - add_entry(c, 0, k, m++, len[k], values); - // add all available leaves - for (i=1; i <= len[k]; ++i) - available[i] = 1 << (32-i); - // note that the above code treats the first case specially, - // but it's really the same as the following code, so they - // could probably be combined (except the initial code is 0, - // and I use 0 in available[] to mean 'empty') - for (i=k+1; i < n; ++i) { - uint32 res; - int z = len[i], y; - if (z == NO_CODE) continue; - // find lowest available leaf (should always be earliest, - // which is what the specification calls for) - // note that this property, and the fact we can never have - // more than one free leaf at a given level, isn't totally - // trivial to prove, but it seems true and the assert never - // fires, so! - while (z > 0 && !available[z]) --z; - if (z == 0) { assert(0); return FALSE; } - res = available[z]; - available[z] = 0; - add_entry(c, bit_reverse(res), i, m++, len[i], values); - // propogate availability up the tree - if (z != len[i]) { - for (y=len[i]; y > z; --y) { - assert(available[y] == 0); - available[y] = res + (1 << (32-y)); - } - } - } - return TRUE; -} - -// accelerated huffman table allows fast O(1) match of all symbols -// of length <= STB_VORBIS_FAST_HUFFMAN_LENGTH -static void compute_accelerated_huffman(Codebook *c) -{ - int i, len; - for (i=0; i < FAST_HUFFMAN_TABLE_SIZE; ++i) - c->fast_huffman[i] = -1; - - len = c->sparse ? c->sorted_entries : c->entries; - #ifdef STB_VORBIS_FAST_HUFFMAN_SHORT - if (len > 32767) len = 32767; // largest possible value we can encode! - #endif - for (i=0; i < len; ++i) { - if (c->codeword_lengths[i] <= STB_VORBIS_FAST_HUFFMAN_LENGTH) { - uint32 z = c->sparse ? bit_reverse(c->sorted_codewords[i]) : c->codewords[i]; - // set table entries for all bit combinations in the higher bits - while (z < FAST_HUFFMAN_TABLE_SIZE) { - c->fast_huffman[z] = i; - z += 1 << c->codeword_lengths[i]; - } - } - } -} - -static int uint32_compare(const void *p, const void *q) -{ - uint32 x = * (uint32 *) p; - uint32 y = * (uint32 *) q; - return x < y ? -1 : x > y; -} - -static int include_in_sort(Codebook *c, uint8 len) -{ - if (c->sparse) { assert(len != NO_CODE); return TRUE; } - if (len == NO_CODE) return FALSE; - if (len > STB_VORBIS_FAST_HUFFMAN_LENGTH) return TRUE; - return FALSE; -} - -// if the fast table above doesn't work, we want to binary -// search them... need to reverse the bits -static void compute_sorted_huffman(Codebook *c, uint8 *lengths, uint32 *values) -{ - int i, len; - // build a list of all the entries - // OPTIMIZATION: don't include the short ones, since they'll be caught by FAST_HUFFMAN. - // this is kind of a frivolous optimization--I don't see any performance improvement, - // but it's like 4 extra lines of code, so. - if (!c->sparse) { - int k = 0; - for (i=0; i < c->entries; ++i) - if (include_in_sort(c, lengths[i])) - c->sorted_codewords[k++] = bit_reverse(c->codewords[i]); - assert(k == c->sorted_entries); - } else { - for (i=0; i < c->sorted_entries; ++i) - c->sorted_codewords[i] = bit_reverse(c->codewords[i]); - } - - qsort(c->sorted_codewords, c->sorted_entries, sizeof(c->sorted_codewords[0]), uint32_compare); - c->sorted_codewords[c->sorted_entries] = 0xffffffff; - - len = c->sparse ? c->sorted_entries : c->entries; - // now we need to indicate how they correspond; we could either - // #1: sort a different data structure that says who they correspond to - // #2: for each sorted entry, search the original list to find who corresponds - // #3: for each original entry, find the sorted entry - // #1 requires extra storage, #2 is slow, #3 can use binary search! - for (i=0; i < len; ++i) { - int huff_len = c->sparse ? lengths[values[i]] : lengths[i]; - if (include_in_sort(c,huff_len)) { - uint32 code = bit_reverse(c->codewords[i]); - int x=0, n=c->sorted_entries; - while (n > 1) { - // invariant: sc[x] <= code < sc[x+n] - int m = x + (n >> 1); - if (c->sorted_codewords[m] <= code) { - x = m; - n -= (n>>1); - } else { - n >>= 1; - } - } - assert(c->sorted_codewords[x] == code); - if (c->sparse) { - c->sorted_values[x] = values[i]; - c->codeword_lengths[x] = huff_len; - } else { - c->sorted_values[x] = i; - } - } - } -} - -// only run while parsing the header (3 times) -static int vorbis_validate(uint8 *data) -{ - static uint8 vorbis[6] = { 'v', 'o', 'r', 'b', 'i', 's' }; - return memcmp(data, vorbis, 6) == 0; -} - -// called from setup only, once per code book -// (formula implied by specification) -static int lookup1_values(int entries, int dim) -{ - int r = (int) floor(exp((float) log((float) entries) / dim)); - if ((int) floor(pow((float) r+1, dim)) <= entries) // (int) cast for MinGW warning; - ++r; // floor() to avoid _ftol() when non-CRT - assert(pow((float) r+1, dim) > entries); - assert((int) floor(pow((float) r, dim)) <= entries); // (int),floor() as above - return r; -} - -// called twice per file -static void compute_twiddle_factors(int n, float *A, float *B, float *C) -{ - int n4 = n >> 2, n8 = n >> 3; - int k,k2; - - for (k=k2=0; k < n4; ++k,k2+=2) { - A[k2 ] = (float) cos(4*k*M_PI/n); - A[k2+1] = (float) -sin(4*k*M_PI/n); - B[k2 ] = (float) cos((k2+1)*M_PI/n/2) * 0.5f; - B[k2+1] = (float) sin((k2+1)*M_PI/n/2) * 0.5f; - } - for (k=k2=0; k < n8; ++k,k2+=2) { - C[k2 ] = (float) cos(2*(k2+1)*M_PI/n); - C[k2+1] = (float) -sin(2*(k2+1)*M_PI/n); - } -} - -static void compute_window(int n, float *window) -{ - int n2 = n >> 1, i; - for (i=0; i < n2; ++i) - window[i] = (float) sin(0.5 * M_PI * square((float) sin((i - 0 + 0.5) / n2 * 0.5 * M_PI))); -} - -static void compute_bitreverse(int n, uint16 *rev) -{ - int ld = ilog(n) - 1; // ilog is off-by-one from normal definitions - int i, n8 = n >> 3; - for (i=0; i < n8; ++i) - rev[i] = (bit_reverse(i) >> (32-ld+3)) << 2; -} - -static int init_blocksize(vorb *f, int b, int n) -{ - int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3; - f->A[b] = (float *) setup_malloc(f, sizeof(float) * n2); - f->B[b] = (float *) setup_malloc(f, sizeof(float) * n2); - f->C[b] = (float *) setup_malloc(f, sizeof(float) * n4); - if (!f->A[b] || !f->B[b] || !f->C[b]) return error(f, VORBIS_outofmem); - compute_twiddle_factors(n, f->A[b], f->B[b], f->C[b]); - f->window[b] = (float *) setup_malloc(f, sizeof(float) * n2); - if (!f->window[b]) return error(f, VORBIS_outofmem); - compute_window(n, f->window[b]); - f->bit_reverse[b] = (uint16 *) setup_malloc(f, sizeof(uint16) * n8); - if (!f->bit_reverse[b]) return error(f, VORBIS_outofmem); - compute_bitreverse(n, f->bit_reverse[b]); - return TRUE; -} - -static void neighbors(uint16 *x, int n, int *plow, int *phigh) -{ - int low = -1; - int high = 65536; - int i; - for (i=0; i < n; ++i) { - if (x[i] > low && x[i] < x[n]) { *plow = i; low = x[i]; } - if (x[i] < high && x[i] > x[n]) { *phigh = i; high = x[i]; } - } -} - -// this has been repurposed so y is now the original index instead of y -typedef struct -{ - uint16 x,y; -} Point; - -int point_compare(const void *p, const void *q) -{ - Point *a = (Point *) p; - Point *b = (Point *) q; - return a->x < b->x ? -1 : a->x > b->x; -} - -// -/////////////////////// END LEAF SETUP FUNCTIONS ////////////////////////// - - -#if defined(STB_VORBIS_NO_STDIO) - #define USE_MEMORY(z) TRUE -#else - #define USE_MEMORY(z) ((z)->stream) -#endif - -static uint8 get8(vorb *z) -{ - if (USE_MEMORY(z)) { - if (z->stream >= z->stream_end) { z->eof = TRUE; return 0; } - return *z->stream++; - } - - #ifndef STB_VORBIS_NO_STDIO - { - int c = fgetc(z->f); - if (c == EOF) { z->eof = TRUE; return 0; } - return c; - } - #endif -} - -static uint32 get32(vorb *f) -{ - uint32 x; - x = get8(f); - x += get8(f) << 8; - x += get8(f) << 16; - x += get8(f) << 24; - return x; -} - -static int getn(vorb *z, uint8 *data, int n) -{ - if (USE_MEMORY(z)) { - if (z->stream+n > z->stream_end) { z->eof = 1; return 0; } - memcpy(data, z->stream, n); - z->stream += n; - return 1; - } - - #ifndef STB_VORBIS_NO_STDIO - if (fread(data, n, 1, z->f) == 1) - return 1; - else { - z->eof = 1; - return 0; - } - #endif -} - -static void skip(vorb *z, int n) -{ - if (USE_MEMORY(z)) { - z->stream += n; - if (z->stream >= z->stream_end) z->eof = 1; - return; - } - #ifndef STB_VORBIS_NO_STDIO - { - long x = ftell(z->f); - fseek(z->f, x+n, SEEK_SET); - } - #endif -} - -static int set_file_offset(stb_vorbis *f, unsigned int loc) -{ - #ifndef STB_VORBIS_NO_PUSHDATA_API - if (f->push_mode) return 0; - #endif - f->eof = 0; - if (USE_MEMORY(f)) { - if (f->stream_start + loc >= f->stream_end || f->stream_start + loc < f->stream_start) { - f->stream = f->stream_end; - f->eof = 1; - return 0; - } else { - f->stream = f->stream_start + loc; - return 1; - } - } - #ifndef STB_VORBIS_NO_STDIO - if (loc + f->f_start < loc || loc >= 0x80000000) { - loc = 0x7fffffff; - f->eof = 1; - } else { - loc += f->f_start; - } - if (!fseek(f->f, loc, SEEK_SET)) - return 1; - f->eof = 1; - fseek(f->f, f->f_start, SEEK_END); - return 0; - #endif -} - - -static uint8 ogg_page_header[4] = { 0x4f, 0x67, 0x67, 0x53 }; - -static int capture_pattern(vorb *f) -{ - if (0x4f != get8(f)) return FALSE; - if (0x67 != get8(f)) return FALSE; - if (0x67 != get8(f)) return FALSE; - if (0x53 != get8(f)) return FALSE; - return TRUE; -} - -#define PAGEFLAG_continued_packet 1 -#define PAGEFLAG_first_page 2 -#define PAGEFLAG_last_page 4 - -static int start_page_no_capturepattern(vorb *f) -{ - uint32 loc0,loc1,n,i; - // stream structure version - if (0 != get8(f)) return error(f, VORBIS_invalid_stream_structure_version); - // header flag - f->page_flag = get8(f); - // absolute granule position - loc0 = get32(f); - loc1 = get32(f); - // @TODO: validate loc0,loc1 as valid positions? - // stream serial number -- vorbis doesn't interleave, so discard - get32(f); - //if (f->serial != get32(f)) return error(f, VORBIS_incorrect_stream_serial_number); - // page sequence number - n = get32(f); - f->last_page = n; - // CRC32 - get32(f); - // page_segments - f->segment_count = get8(f); - if (!getn(f, f->segments, f->segment_count)) - return error(f, VORBIS_unexpected_eof); - // assume we _don't_ know any the sample position of any segments - f->end_seg_with_known_loc = -2; - if (loc0 != ~0 || loc1 != ~0) { - // determine which packet is the last one that will complete - for (i=f->segment_count-1; i >= 0; --i) - if (f->segments[i] < 255) - break; - // 'i' is now the index of the _last_ segment of a packet that ends - if (i >= 0) { - f->end_seg_with_known_loc = i; - f->known_loc_for_packet = loc0; - } - } - if (f->first_decode) { - int i,len; - ProbedPage p; - len = 0; - for (i=0; i < f->segment_count; ++i) - len += f->segments[i]; - len += 27 + f->segment_count; - p.page_start = f->first_audio_page_offset; - p.page_end = p.page_start + len; - p.after_previous_page_start = p.page_start; - p.first_decoded_sample = 0; - p.last_decoded_sample = loc0; - f->p_first = p; - } - f->next_seg = 0; - return TRUE; -} - -static int start_page(vorb *f) -{ - if (!capture_pattern(f)) return error(f, VORBIS_missing_capture_pattern); - return start_page_no_capturepattern(f); -} - -static int start_packet(vorb *f) -{ - while (f->next_seg == -1) { - if (!start_page(f)) return FALSE; - if (f->page_flag & PAGEFLAG_continued_packet) - return error(f, VORBIS_continued_packet_flag_invalid); - } - f->last_seg = FALSE; - f->valid_bits = 0; - f->packet_bytes = 0; - f->bytes_in_seg = 0; - // f->next_seg is now valid - return TRUE; -} - -static int maybe_start_packet(vorb *f) -{ - if (f->next_seg == -1) { - int x = get8(f); - if (f->eof) return FALSE; // EOF at page boundary is not an error! - if (0x4f != x ) return error(f, VORBIS_missing_capture_pattern); - if (0x67 != get8(f)) return error(f, VORBIS_missing_capture_pattern); - if (0x67 != get8(f)) return error(f, VORBIS_missing_capture_pattern); - if (0x53 != get8(f)) return error(f, VORBIS_missing_capture_pattern); - if (!start_page_no_capturepattern(f)) return FALSE; - if (f->page_flag & PAGEFLAG_continued_packet) { - // set up enough state that we can read this packet if we want, - // e.g. during recovery - f->last_seg = FALSE; - f->bytes_in_seg = 0; - return error(f, VORBIS_continued_packet_flag_invalid); - } - } - return start_packet(f); -} - -static int next_segment(vorb *f) -{ - int len; - if (f->last_seg) return 0; - if (f->next_seg == -1) { - f->last_seg_which = f->segment_count-1; // in case start_page fails - if (!start_page(f)) { f->last_seg = 1; return 0; } - if (!(f->page_flag & PAGEFLAG_continued_packet)) return error(f, VORBIS_continued_packet_flag_invalid); - } - len = f->segments[f->next_seg++]; - if (len < 255) { - f->last_seg = TRUE; - f->last_seg_which = f->next_seg-1; - } - if (f->next_seg >= f->segment_count) - f->next_seg = -1; - assert(f->bytes_in_seg == 0); - f->bytes_in_seg = len; - return len; -} - -#define EOP (-1) -#define INVALID_BITS (-1) - -static int get8_packet_raw(vorb *f) -{ - if (!f->bytes_in_seg) { - if (f->last_seg) return EOP; - else if (!next_segment(f)) return EOP; - } - assert(f->bytes_in_seg > 0); - --f->bytes_in_seg; - ++f->packet_bytes; - return get8(f); -} - -static int get8_packet(vorb *f) -{ - int x = get8_packet_raw(f); - f->valid_bits = 0; - return x; -} - -static void flush_packet(vorb *f) -{ - while (get8_packet_raw(f) != EOP); -} - -// @OPTIMIZE: this is the secondary bit decoder, so it's probably not as important -// as the huffman decoder? -static uint32 get_bits(vorb *f, int n) -{ - uint32 z; - - if (f->valid_bits < 0) return 0; - if (f->valid_bits < n) { - if (n > 24) { - // the accumulator technique below would not work correctly in this case - z = get_bits(f, 24); - z += get_bits(f, n-24) << 24; - return z; - } - if (f->valid_bits == 0) f->acc = 0; - while (f->valid_bits < n) { - int z = get8_packet_raw(f); - if (z == EOP) { - f->valid_bits = INVALID_BITS; - return 0; - } - f->acc += z << f->valid_bits; - f->valid_bits += 8; - } - } - if (f->valid_bits < 0) return 0; - z = f->acc & ((1 << n)-1); - f->acc >>= n; - f->valid_bits -= n; - return z; -} --/* -static int32 get_bits_signed(vorb *f, int n) { - uint32 z = get_bits(f, n); - if (z & (1 << (n-1))) - z += ~((1 << n) - 1); - return (int32) z; -}-*/ - -// @OPTIMIZE: primary accumulator for huffman -// expand the buffer to as many bits as possible without reading off end of packet -// it might be nice to allow f->valid_bits and f->acc to be stored in registers, -// e.g. cache them locally and decode locally -static __forceinline void prep_huffman(vorb *f) -{ - if (f->valid_bits <= 24) { - if (f->valid_bits == 0) f->acc = 0; - do { - int z; - if (f->last_seg && !f->bytes_in_seg) return; - z = get8_packet_raw(f); - if (z == EOP) return; - f->acc += z << f->valid_bits; - f->valid_bits += 8; - } while (f->valid_bits <= 24); - } -} - -enum -{ - VORBIS_packet_id = 1, - VORBIS_packet_comment = 3, - VORBIS_packet_setup = 5, -}; - -static int codebook_decode_scalar_raw(vorb *f, Codebook *c) -{ - int i; - prep_huffman(f); - - assert(c->sorted_codewords || c->codewords); - // cases to use binary search: sorted_codewords && !c->codewords - // sorted_codewords && c->entries > 8 - if (c->entries > 8 ? c->sorted_codewords!=NULL : !c->codewords) { - // binary search - uint32 code = bit_reverse(f->acc); - int x=0, n=c->sorted_entries, len; - - while (n > 1) { - // invariant: sc[x] <= code < sc[x+n] - int m = x + (n >> 1); - if (c->sorted_codewords[m] <= code) { - x = m; - n -= (n>>1); - } else { - n >>= 1; - } - } - // x is now the sorted index - if (!c->sparse) x = c->sorted_values[x]; - // x is now sorted index if sparse, or symbol otherwise - len = c->codeword_lengths[x]; - if (f->valid_bits >= len) { - f->acc >>= len; - f->valid_bits -= len; - return x; - } - - f->valid_bits = 0; - return -1; - } - - // if small, linear search - assert(!c->sparse); - for (i=0; i < c->entries; ++i) { - if (c->codeword_lengths[i] == NO_CODE) continue; - if (c->codewords[i] == (f->acc & ((1 << c->codeword_lengths[i])-1))) { - if (f->valid_bits >= c->codeword_lengths[i]) { - f->acc >>= c->codeword_lengths[i]; - f->valid_bits -= c->codeword_lengths[i]; - return i; - } - f->valid_bits = 0; - return -1; - } - } - - error(f, VORBIS_invalid_stream); - f->valid_bits = 0; - return -1; -} --/* -static int codebook_decode_scalar(vorb *f, Codebook *c) { - int i; - if (f->valid_bits < STB_VORBIS_FAST_HUFFMAN_LENGTH) - prep_huffman(f); - // fast huffman table lookup - i = f->acc & FAST_HUFFMAN_TABLE_MASK; - i = c->fast_huffman[i]; - if (i >= 0) { - f->acc >>= c->codeword_lengths[i]; - f->valid_bits -= c->codeword_lengths[i]; - if (f->valid_bits < 0) { f->valid_bits = 0; return -1; } - return i; - } - return codebook_decode_scalar_raw(f,c); -} -*/- -#ifndef STB_VORBIS_NO_INLINE_DECODE - -#define DECODE_RAW(var, f,c) \ - if (f->valid_bits < STB_VORBIS_FAST_HUFFMAN_LENGTH) \ - prep_huffman(f); \ - var = f->acc & FAST_HUFFMAN_TABLE_MASK; \ - var = c->fast_huffman[var]; \ - if (var >= 0) { \ - int n = c->codeword_lengths[var]; \ - f->acc >>= n; \ - f->valid_bits -= n; \ - if (f->valid_bits < 0) { f->valid_bits = 0; var = -1; } \ - } else { \ - var = codebook_decode_scalar_raw(f,c); \ - } - -#else - -#define DECODE_RAW(var,f,c) var = codebook_decode_scalar(f,c); - -#endif - -#define DECODE(var,f,c) \ - DECODE_RAW(var,f,c) \ - if (c->sparse) var = c->sorted_values[var]; - -#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK - #define DECODE_VQ(var,f,c) DECODE_RAW(var,f,c) -#else - #define DECODE_VQ(var,f,c) DECODE(var,f,c) -#endif - - - - - - -// CODEBOOK_ELEMENT_FAST is an optimization for the CODEBOOK_FLOATS case -// where we avoid one addition -#ifndef STB_VORBIS_CODEBOOK_FLOATS - #define CODEBOOK_ELEMENT(c,off) (c->multiplicands[off] * c->delta_value + c->minimum_value) - #define CODEBOOK_ELEMENT_FAST(c,off) (c->multiplicands[off] * c->delta_value) - #define CODEBOOK_ELEMENT_BASE(c) (c->minimum_value) -#else - #define CODEBOOK_ELEMENT(c,off) (c->multiplicands[off]) - #define CODEBOOK_ELEMENT_FAST(c,off) (c->multiplicands[off]) - #define CODEBOOK_ELEMENT_BASE(c) (0) -#endif - -static int codebook_decode_start(vorb *f, Codebook *c, int len) -{ - int z = -1; - - // type 0 is only legal in a scalar context - if (c->lookup_type == 0) - error(f, VORBIS_invalid_stream); - else { - DECODE_VQ(z,f,c); - if (c->sparse) assert(z < c->sorted_entries); - if (z < 0) { // check for EOP - if (!f->bytes_in_seg) - if (f->last_seg) - return z; - error(f, VORBIS_invalid_stream); - } - } - return z; -} - -static int codebook_decode(vorb *f, Codebook *c, float *output, int len) -{ - int i,z = codebook_decode_start(f,c,len); - if (z < 0) return FALSE; - if (len > c->dimensions) len = c->dimensions; - -#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK - if (c->lookup_type == 1) { - float last = CODEBOOK_ELEMENT_BASE(c); - int div = 1; - for (i=0; i < len; ++i) { - int off = (z / div) % c->lookup_values; - float val = CODEBOOK_ELEMENT_FAST(c,off) + last; - output[i] += val; - if (c->sequence_p) last = val + c->minimum_value; - div *= c->lookup_values; - } - return TRUE; - } -#endif - - z *= c->dimensions; - if (c->sequence_p) { - float last = CODEBOOK_ELEMENT_BASE(c); - for (i=0; i < len; ++i) { - float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last; - output[i] += val; - last = val + c->minimum_value; - } - } else { - float last = CODEBOOK_ELEMENT_BASE(c); - for (i=0; i < len; ++i) { - output[i] += CODEBOOK_ELEMENT_FAST(c,z+i) + last; - } - } - - return TRUE; -} - -static int codebook_decode_step(vorb *f, Codebook *c, float *output, int len, int step) -{ - int i,z = codebook_decode_start(f,c,len); - float last = CODEBOOK_ELEMENT_BASE(c); - if (z < 0) return FALSE; - if (len > c->dimensions) len = c->dimensions; - -#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK - if (c->lookup_type == 1) { - int div = 1; - for (i=0; i < len; ++i) { - int off = (z / div) % c->lookup_values; - float val = CODEBOOK_ELEMENT_FAST(c,off) + last; - output[i*step] += val; - if (c->sequence_p) last = val; - div *= c->lookup_values; - } - return TRUE; - } -#endif - - z *= c->dimensions; - for (i=0; i < len; ++i) { - float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last; - output[i*step] += val; - if (c->sequence_p) last = val; - } - - return TRUE; -} - -static int codebook_decode_deinterleave_repeat(vorb *f, Codebook *c, float **outputs, int ch, int *c_inter_p, int *p_inter_p, int len, int total_decode) -{ - int c_inter = *c_inter_p; - int p_inter = *p_inter_p; - int i,z, effective = c->dimensions; - - // type 0 is only legal in a scalar context - if (c->lookup_type == 0) return error(f, VORBIS_invalid_stream); - - while (total_decode > 0) { - float last = CODEBOOK_ELEMENT_BASE(c); - DECODE_VQ(z,f,c); - #ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK - assert(!c->sparse || z < c->sorted_entries); - #endif - if (z < 0) { - if (!f->bytes_in_seg) - if (f->last_seg) return FALSE; - return error(f, VORBIS_invalid_stream); - } - - // if this will take us off the end of the buffers, stop short! - // we check by computing the length of the virtual interleaved - // buffer (len*ch), our current offset within it (p_inter*ch)+(c_inter), - // and the length we'll be using (effective) - if (c_inter + p_inter*ch + effective > len * ch) { - effective = len*ch - (p_inter*ch - c_inter); - } - - #ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK - if (c->lookup_type == 1) { - int div = 1; - for (i=0; i < effective; ++i) { - int off = (z / div) % c->lookup_values; - float val = CODEBOOK_ELEMENT_FAST(c,off) + last; - outputs[c_inter][p_inter] += val; - if (++c_inter == ch) { c_inter = 0; ++p_inter; } - if (c->sequence_p) last = val; - div *= c->lookup_values; - } - } else - #endif - { - z *= c->dimensions; - if (c->sequence_p) { - for (i=0; i < effective; ++i) { - float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last; - outputs[c_inter][p_inter] += val; - if (++c_inter == ch) { c_inter = 0; ++p_inter; } - last = val; - } - } else { - for (i=0; i < effective; ++i) { - float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last; - outputs[c_inter][p_inter] += val; - if (++c_inter == ch) { c_inter = 0; ++p_inter; } - } - } - } - - total_decode -= effective; - } - *c_inter_p = c_inter; - *p_inter_p = p_inter; - return TRUE; -} - -#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK -static int codebook_decode_deinterleave_repeat_2(vorb *f, Codebook *c, float **outputs, int *c_inter_p, int *p_inter_p, int len, int total_decode) -{ - int c_inter = *c_inter_p; - int p_inter = *p_inter_p; - int i,z, effective = c->dimensions; - - // type 0 is only legal in a scalar context - if (c->lookup_type == 0) return error(f, VORBIS_invalid_stream); - - while (total_decode > 0) { - float last = CODEBOOK_ELEMENT_BASE(c); - DECODE_VQ(z,f,c); - - if (z < 0) { - if (!f->bytes_in_seg) - if (f->last_seg) return FALSE; - return error(f, VORBIS_invalid_stream); - } - - // if this will take us off the end of the buffers, stop short! - // we check by computing the length of the virtual interleaved - // buffer (len*ch), our current offset within it (p_inter*ch)+(c_inter), - // and the length we'll be using (effective) - if (c_inter + p_inter*2 + effective > len * 2) { - effective = len*2 - (p_inter*2 - c_inter); - } - - { - z *= c->dimensions; - if (c->sequence_p) { - // haven't optimized this case because I don't have any examples - for (i=0; i < effective; ++i) { - float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last; - outputs[c_inter][p_inter] += val; - if (++c_inter == 2) { c_inter = 0; ++p_inter; } - last = val; - } - } else { - i=0; - if (c_inter == 1) { - float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last; - outputs[c_inter][p_inter] += val; - c_inter = 0; ++p_inter; - ++i; - } - { - float *z0 = outputs[0]; - float *z1 = outputs[1]; - for (; i+1 < effective;) { - z0[p_inter] += CODEBOOK_ELEMENT_FAST(c,z+i) + last; - z1[p_inter] += CODEBOOK_ELEMENT_FAST(c,z+i+1) + last; - ++p_inter; - i += 2; - } - } - if (i < effective) { - float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last; - outputs[c_inter][p_inter] += val; - if (++c_inter == 2) { c_inter = 0; ++p_inter; } - } - } - } - - total_decode -= effective; - } - *c_inter_p = c_inter; - *p_inter_p = p_inter; - return TRUE; -} -#endif - -static int predict_point(int x, int x0, int x1, int y0, int y1) -{ - int dy = y1 - y0; - int adx = x1 - x0; - // @OPTIMIZE: force int division to round in the right direction... is this necessary on x86? - int err = abs(dy) * (x - x0); - int off = err / adx; - return dy < 0 ? y0 - off : y0 + off; -} - -// the following table is block-copied from the specification -static float inverse_db_table[256] = -{ - 1.0649863e-07f, 1.1341951e-07f, 1.2079015e-07f, 1.2863978e-07f, - 1.3699951e-07f, 1.4590251e-07f, 1.5538408e-07f, 1.6548181e-07f, - 1.7623575e-07f, 1.8768855e-07f, 1.9988561e-07f, 2.1287530e-07f, - 2.2670913e-07f, 2.4144197e-07f, 2.5713223e-07f, 2.7384213e-07f, - 2.9163793e-07f, 3.1059021e-07f, 3.3077411e-07f, 3.5226968e-07f, - 3.7516214e-07f, 3.9954229e-07f, 4.2550680e-07f, 4.5315863e-07f, - 4.8260743e-07f, 5.1396998e-07f, 5.4737065e-07f, 5.8294187e-07f, - 6.2082472e-07f, 6.6116941e-07f, 7.0413592e-07f, 7.4989464e-07f, - 7.9862701e-07f, 8.5052630e-07f, 9.0579828e-07f, 9.6466216e-07f, - 1.0273513e-06f, 1.0941144e-06f, 1.1652161e-06f, 1.2409384e-06f, - 1.3215816e-06f, 1.4074654e-06f, 1.4989305e-06f, 1.5963394e-06f, - 1.7000785e-06f, 1.8105592e-06f, 1.9282195e-06f, 2.0535261e-06f, - 2.1869758e-06f, 2.3290978e-06f, 2.4804557e-06f, 2.6416497e-06f, - 2.8133190e-06f, 2.9961443e-06f, 3.1908506e-06f, 3.3982101e-06f, - 3.6190449e-06f, 3.8542308e-06f, 4.1047004e-06f, 4.3714470e-06f, - 4.6555282e-06f, 4.9580707e-06f, 5.2802740e-06f, 5.6234160e-06f, - 5.9888572e-06f, 6.3780469e-06f, 6.7925283e-06f, 7.2339451e-06f, - 7.7040476e-06f, 8.2047000e-06f, 8.7378876e-06f, 9.3057248e-06f, - 9.9104632e-06f, 1.0554501e-05f, 1.1240392e-05f, 1.1970856e-05f, - 1.2748789e-05f, 1.3577278e-05f, 1.4459606e-05f, 1.5399272e-05f, - 1.6400004e-05f, 1.7465768e-05f, 1.8600792e-05f, 1.9809576e-05f, - 2.1096914e-05f, 2.2467911e-05f, 2.3928002e-05f, 2.5482978e-05f, - 2.7139006e-05f, 2.8902651e-05f, 3.0780908e-05f, 3.2781225e-05f, - 3.4911534e-05f, 3.7180282e-05f, 3.9596466e-05f, 4.2169667e-05f, - 4.4910090e-05f, 4.7828601e-05f, 5.0936773e-05f, 5.4246931e-05f, - 5.7772202e-05f, 6.1526565e-05f, 6.5524908e-05f, 6.9783085e-05f, - 7.4317983e-05f, 7.9147585e-05f, 8.4291040e-05f, 8.9768747e-05f, - 9.5602426e-05f, 0.00010181521f, 0.00010843174f, 0.00011547824f, - 0.00012298267f, 0.00013097477f, 0.00013948625f, 0.00014855085f, - 0.00015820453f, 0.00016848555f, 0.00017943469f, 0.00019109536f, - 0.00020351382f, 0.00021673929f, 0.00023082423f, 0.00024582449f, - 0.00026179955f, 0.00027881276f, 0.00029693158f, 0.00031622787f, - 0.00033677814f, 0.00035866388f, 0.00038197188f, 0.00040679456f, - 0.00043323036f, 0.00046138411f, 0.00049136745f, 0.00052329927f, - 0.00055730621f, 0.00059352311f, 0.00063209358f, 0.00067317058f, - 0.00071691700f, 0.00076350630f, 0.00081312324f, 0.00086596457f, - 0.00092223983f, 0.00098217216f, 0.0010459992f, 0.0011139742f, - 0.0011863665f, 0.0012634633f, 0.0013455702f, 0.0014330129f, - 0.0015261382f, 0.0016253153f, 0.0017309374f, 0.0018434235f, - 0.0019632195f, 0.0020908006f, 0.0022266726f, 0.0023713743f, - 0.0025254795f, 0.0026895994f, 0.0028643847f, 0.0030505286f, - 0.0032487691f, 0.0034598925f, 0.0036847358f, 0.0039241906f, - 0.0041792066f, 0.0044507950f, 0.0047400328f, 0.0050480668f, - 0.0053761186f, 0.0057254891f, 0.0060975636f, 0.0064938176f, - 0.0069158225f, 0.0073652516f, 0.0078438871f, 0.0083536271f, - 0.0088964928f, 0.009474637f, 0.010090352f, 0.010746080f, - 0.011444421f, 0.012188144f, 0.012980198f, 0.013823725f, - 0.014722068f, 0.015678791f, 0.016697687f, 0.017782797f, - 0.018938423f, 0.020169149f, 0.021479854f, 0.022875735f, - 0.024362330f, 0.025945531f, 0.027631618f, 0.029427276f, - 0.031339626f, 0.033376252f, 0.035545228f, 0.037855157f, - 0.040315199f, 0.042935108f, 0.045725273f, 0.048696758f, - 0.051861348f, 0.055231591f, 0.058820850f, 0.062643361f, - 0.066714279f, 0.071049749f, 0.075666962f, 0.080584227f, - 0.085821044f, 0.091398179f, 0.097337747f, 0.10366330f, - 0.11039993f, 0.11757434f, 0.12521498f, 0.13335215f, - 0.14201813f, 0.15124727f, 0.16107617f, 0.17154380f, - 0.18269168f, 0.19456402f, 0.20720788f, 0.22067342f, - 0.23501402f, 0.25028656f, 0.26655159f, 0.28387361f, - 0.30232132f, 0.32196786f, 0.34289114f, 0.36517414f, - 0.38890521f, 0.41417847f, 0.44109412f, 0.46975890f, - 0.50028648f, 0.53279791f, 0.56742212f, 0.60429640f, - 0.64356699f, 0.68538959f, 0.72993007f, 0.77736504f, - 0.82788260f, 0.88168307f, 0.9389798f, 1.0f -}; - - -// @OPTIMIZE: if you want to replace this bresenham line-drawing routine, -// note that you must produce bit-identical output to decode correctly; -// this specific sequence of operations is specified in the spec (it's -// drawing integer-quantized frequency-space lines that the encoder -// expects to be exactly the same) -// ... also, isn't the whole point of Bresenham's algorithm to NOT -// have to divide in the setup? sigh. -#ifndef STB_VORBIS_NO_DEFER_FLOOR -#define LINE_OP(a,b) a *= b -#else -#define LINE_OP(a,b) a = b -#endif - -#ifdef STB_VORBIS_DIVIDE_TABLE -#define DIVTAB_NUMER 32 -#define DIVTAB_DENOM 64 -int8 integer_divide_table[DIVTAB_NUMER][DIVTAB_DENOM]; // 2KB -#endif - -static __forceinline void draw_line(float *output, int x0, int y0, int x1, int y1, int n) -{ - int dy = y1 - y0; - int adx = x1 - x0; - int ady = abs(dy); - int base; - int x=x0,y=y0; - int err = 0; - int sy; - -#ifdef STB_VORBIS_DIVIDE_TABLE - if (adx < DIVTAB_DENOM && ady < DIVTAB_NUMER) { - if (dy < 0) { - base = -integer_divide_table[ady][adx]; - sy = base-1; - } else { - base = integer_divide_table[ady][adx]; - sy = base+1; - } - } else { - base = dy / adx; - if (dy < 0) - sy = base - 1; - else - sy = base+1; - } -#else - base = dy / adx; - if (dy < 0) - sy = base - 1; - else - sy = base+1; -#endif - ady -= abs(base) * adx; - if (x1 > n) x1 = n; - LINE_OP(output[x], inverse_db_table[y]); - for (++x; x < x1; ++x) { - err += ady; - if (err >= adx) { - err -= adx; - y += sy; - } else - y += base; - LINE_OP(output[x], inverse_db_table[y]); - } -} - -static int residue_decode(vorb *f, Codebook *book, float *target, int offset, int n, int rtype) -{ - int k; - if (rtype == 0) { - int step = n / book->dimensions; - for (k=0; k < step; ++k) - if (!codebook_decode_step(f, book, target+offset+k, n-offset-k, step)) - return FALSE; - } else { - for (k=0; k < n; ) { - if (!codebook_decode(f, book, target+offset, n-k)) - return FALSE; - k += book->dimensions; - offset += book->dimensions; - } - } - return TRUE; -} - -static void decode_residue(vorb *f, float *residue_buffers[], int ch, int n, int rn, uint8 *do_not_decode) -{ - int i,j,pass; - Residue *r = f->residue_config + rn; - int rtype = f->residue_types[rn]; - int c = r->classbook; - int classwords = f->codebooks[c].dimensions; - int n_read = r->end - r->begin; - int part_read = n_read / r->part_size; - int temp_alloc_point = temp_alloc_save(f); - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - uint8 ***part_classdata = (uint8 ***) temp_block_array(f,f->channels, part_read * sizeof(**part_classdata)); - #else - int **classifications = (int **) temp_block_array(f,f->channels, part_read * sizeof(**classifications)); - #endif - - for (i=0; i < ch; ++i) - if (!do_not_decode[i]) - memset(residue_buffers[i], 0, sizeof(float) * n); - - if (rtype == 2 && ch != 1) { - //int len = ch * n; - for (j=0; j < ch; ++j) - if (!do_not_decode[j]) - break; - if (j == ch) - goto done; - - for (pass=0; pass < 8; ++pass) { - int pcount = 0, class_set = 0; - if (ch == 2) { - while (pcount < part_read) { - int z = r->begin + pcount*r->part_size; - int c_inter = (z & 1), p_inter = z>>1; - if (pass == 0) { - Codebook *c = f->codebooks+r->classbook; - int q; - DECODE(q,f,c); - if (q == EOP) goto done; - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - part_classdata[0][class_set] = r->classdata[q]; - #else - for (i=classwords-1; i >= 0; --i) { - classifications[0][i+pcount] = q % r->classifications; - q /= r->classifications; - } - #endif - } - for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) { - int z = r->begin + pcount*r->part_size; - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - int c = part_classdata[0][class_set][i]; - #else - int c = classifications[0][pcount]; - #endif - int b = r->residue_books[c][pass]; - if (b >= 0) { - Codebook *book = f->codebooks + b; - #ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK - if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size)) - goto done; - #else - // saves 1% - if (!codebook_decode_deinterleave_repeat_2(f, book, residue_buffers, &c_inter, &p_inter, n, r->part_size)) - goto done; - #endif - } else { - z += r->part_size; - c_inter = z & 1; - p_inter = z >> 1; - } - } - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - ++class_set; - #endif - } - } else if (ch == 1) { - while (pcount < part_read) { - int z = r->begin + pcount*r->part_size; - int c_inter = 0, p_inter = z; - if (pass == 0) { - Codebook *c = f->codebooks+r->classbook; - int q; - DECODE(q,f,c); - if (q == EOP) goto done; - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - part_classdata[0][class_set] = r->classdata[q]; - #else - for (i=classwords-1; i >= 0; --i) { - classifications[0][i+pcount] = q % r->classifications; - q /= r->classifications; - } - #endif - } - for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) { - int z = r->begin + pcount*r->part_size; - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - int c = part_classdata[0][class_set][i]; - #else - int c = classifications[0][pcount]; - #endif - int b = r->residue_books[c][pass]; - if (b >= 0) { - Codebook *book = f->codebooks + b; - if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size)) - goto done; - } else { - z += r->part_size; - c_inter = 0; - p_inter = z; - } - } - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - ++class_set; - #endif - } - } else { - while (pcount < part_read) { - int z = r->begin + pcount*r->part_size; - int c_inter = z % ch, p_inter = z/ch; - if (pass == 0) { - Codebook *c = f->codebooks+r->classbook; - int q; - DECODE(q,f,c); - if (q == EOP) goto done; - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - part_classdata[0][class_set] = r->classdata[q]; - #else - for (i=classwords-1; i >= 0; --i) { - classifications[0][i+pcount] = q % r->classifications; - q /= r->classifications; - } - #endif - } - for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) { - int z = r->begin + pcount*r->part_size; - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - int c = part_classdata[0][class_set][i]; - #else - int c = classifications[0][pcount]; - #endif - int b = r->residue_books[c][pass]; - if (b >= 0) { - Codebook *book = f->codebooks + b; - if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size)) - goto done; - } else { - z += r->part_size; - c_inter = z % ch; - p_inter = z / ch; - } - } - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - ++class_set; - #endif - } - } - } - goto done; - } - - for (pass=0; pass < 8; ++pass) { - int pcount = 0, class_set=0; - while (pcount < part_read) { - if (pass == 0) { - for (j=0; j < ch; ++j) { - if (!do_not_decode[j]) { - Codebook *c = f->codebooks+r->classbook; - int temp; - DECODE(temp,f,c); - if (temp == EOP) goto done; - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - part_classdata[j][class_set] = r->classdata[temp]; - #else - for (i=classwords-1; i >= 0; --i) { - classifications[j][i+pcount] = temp % r->classifications; - temp /= r->classifications; - } - #endif - } - } - } - for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) { - for (j=0; j < ch; ++j) { - if (!do_not_decode[j]) { - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - int c = part_classdata[j][class_set][i]; - #else - int c = classifications[j][pcount]; - #endif - int b = r->residue_books[c][pass]; - if (b >= 0) { - float *target = residue_buffers[j]; - int offset = r->begin + pcount * r->part_size; - int n = r->part_size; - Codebook *book = f->codebooks + b; - if (!residue_decode(f, book, target, offset, n, rtype)) - goto done; - } - } - } - } - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - ++class_set; - #endif - } - } - done: - temp_alloc_restore(f,temp_alloc_point); -} - - -#if 0 -// slow way for debugging -void inverse_mdct_slow(float *buffer, int n) -{ - int i,j; - int n2 = n >> 1; - float *x = (float *) malloc(sizeof(*x) * n2); - memcpy(x, buffer, sizeof(*x) * n2); - for (i=0; i < n; ++i) { - float acc = 0; - for (j=0; j < n2; ++j) - // formula from paper: - //acc += n/4.0f * x[j] * (float) cos(M_PI / 2 / n * (2 * i + 1 + n/2.0)*(2*j+1)); - // formula from wikipedia - //acc += 2.0f / n2 * x[j] * (float) cos(M_PI/n2 * (i + 0.5 + n2/2)*(j + 0.5)); - // these are equivalent, except the formula from the paper inverts the multiplier! - // however, what actually works is NO MULTIPLIER!?! - //acc += 64 * 2.0f / n2 * x[j] * (float) cos(M_PI/n2 * (i + 0.5 + n2/2)*(j + 0.5)); - acc += x[j] * (float) cos(M_PI / 2 / n * (2 * i + 1 + n/2.0)*(2*j+1)); - buffer[i] = acc; - } - free(x); -} -#elif 0 -// same as above, but just barely able to run in real time on modern machines -void inverse_mdct_slow(float *buffer, int n, vorb *f, int blocktype) -{ - float mcos[16384]; - int i,j; - int n2 = n >> 1, nmask = (n << 2) -1; - float *x = (float *) malloc(sizeof(*x) * n2); - memcpy(x, buffer, sizeof(*x) * n2); - for (i=0; i < 4*n; ++i) - mcos[i] = (float) cos(M_PI / 2 * i / n); - - for (i=0; i < n; ++i) { - float acc = 0; - for (j=0; j < n2; ++j) - acc += x[j] * mcos[(2 * i + 1 + n2)*(2*j+1) & nmask]; - buffer[i] = acc; - } - free(x); -} -#else -// transform to use a slow dct-iv; this is STILL basically trivial, -// but only requires half as many ops -void dct_iv_slow(float *buffer, int n) -{ - float mcos[16384]; - float x[2048]; - int i,j; - //int n2 = n >> 1;- int nmask = (n << 3) - 1; - memcpy(x, buffer, sizeof(*x) * n); - for (i=0; i < 8*n; ++i) - mcos[i] = (float) cos(M_PI / 4 * i / n); - for (i=0; i < n; ++i) { - float acc = 0; - for (j=0; j < n; ++j) - acc += x[j] * mcos[((2 * i + 1)*(2*j+1)) & nmask]; - //acc += x[j] * cos(M_PI / n * (i + 0.5) * (j + 0.5)); - buffer[i] = acc; - } - free(x); -} - -void inverse_mdct_slow(float *buffer, int n, vorb *f, int blocktype) -{ - int i, n4 = n >> 2, n2 = n >> 1, n3_4 = n - n4; - float temp[4096]; - - memcpy(temp, buffer, n2 * sizeof(float)); - dct_iv_slow(temp, n2); // returns -c'-d, a-b' - - for (i=0; i < n4 ; ++i) buffer[i] = temp[i+n4]; // a-b' - for ( ; i < n3_4; ++i) buffer[i] = -temp[n3_4 - i - 1]; // b-a', c+d' - for ( ; i < n ; ++i) buffer[i] = -temp[i - n3_4]; // c'+d -} -#endif - -#ifndef LIBVORBIS_MDCT -#define LIBVORBIS_MDCT 0 -#endif - -#if LIBVORBIS_MDCT -// directly call the vorbis MDCT using an interface documented -// by Jeff Roberts... useful for performance comparison -typedef struct -{ - int n; - int log2n; - - float *trig; - int *bitrev; - - float scale; -} mdct_lookup; - -extern void mdct_init(mdct_lookup *lookup, int n); -extern void mdct_clear(mdct_lookup *l); -extern void mdct_backward(mdct_lookup *init, float *in, float *out); - -mdct_lookup M1,M2; - -void inverse_mdct(float *buffer, int n, vorb *f, int blocktype) -{ - mdct_lookup *M; - if (M1.n == n) M = &M1; - else if (M2.n == n) M = &M2; - else if (M1.n == 0) { mdct_init(&M1, n); M = &M1; } - else { - if (M2.n) __asm int 3; - mdct_init(&M2, n); - M = &M2; - } - - mdct_backward(M, buffer, buffer); -} -#endif - - -// the following were split out into separate functions while optimizing; -// they could be pushed back up but eh. __forceinline showed no change; -// they're probably already being inlined. -static void imdct_step3_iter0_loop(int n, float *e, int i_off, int k_off, float *A) -{ - float *ee0 = e + i_off; - float *ee2 = ee0 + k_off; - int i; - - assert((n & 3) == 0); - for (i=(n>>2); i > 0; --i) { - float k00_20, k01_21; - k00_20 = ee0[ 0] - ee2[ 0]; - k01_21 = ee0[-1] - ee2[-1]; - ee0[ 0] += ee2[ 0];//ee0[ 0] = ee0[ 0] + ee2[ 0]; - ee0[-1] += ee2[-1];//ee0[-1] = ee0[-1] + ee2[-1]; - ee2[ 0] = k00_20 * A[0] - k01_21 * A[1]; - ee2[-1] = k01_21 * A[0] + k00_20 * A[1]; - A += 8; - - k00_20 = ee0[-2] - ee2[-2]; - k01_21 = ee0[-3] - ee2[-3]; - ee0[-2] += ee2[-2];//ee0[-2] = ee0[-2] + ee2[-2]; - ee0[-3] += ee2[-3];//ee0[-3] = ee0[-3] + ee2[-3]; - ee2[-2] = k00_20 * A[0] - k01_21 * A[1]; - ee2[-3] = k01_21 * A[0] + k00_20 * A[1]; - A += 8; - - k00_20 = ee0[-4] - ee2[-4]; - k01_21 = ee0[-5] - ee2[-5]; - ee0[-4] += ee2[-4];//ee0[-4] = ee0[-4] + ee2[-4]; - ee0[-5] += ee2[-5];//ee0[-5] = ee0[-5] + ee2[-5]; - ee2[-4] = k00_20 * A[0] - k01_21 * A[1]; - ee2[-5] = k01_21 * A[0] + k00_20 * A[1]; - A += 8; - - k00_20 = ee0[-6] - ee2[-6]; - k01_21 = ee0[-7] - ee2[-7]; - ee0[-6] += ee2[-6];//ee0[-6] = ee0[-6] + ee2[-6]; - ee0[-7] += ee2[-7];//ee0[-7] = ee0[-7] + ee2[-7]; - ee2[-6] = k00_20 * A[0] - k01_21 * A[1]; - ee2[-7] = k01_21 * A[0] + k00_20 * A[1]; - A += 8; - ee0 -= 8; - ee2 -= 8; - } -} - -static void imdct_step3_inner_r_loop(int lim, float *e, int d0, int k_off, float *A, int k1) -{ - int i; - float k00_20, k01_21; - - float *e0 = e + d0; - float *e2 = e0 + k_off; - - for (i=lim >> 2; i > 0; --i) { - k00_20 = e0[-0] - e2[-0]; - k01_21 = e0[-1] - e2[-1]; - e0[-0] += e2[-0];//e0[-0] = e0[-0] + e2[-0]; - e0[-1] += e2[-1];//e0[-1] = e0[-1] + e2[-1]; - e2[-0] = (k00_20)*A[0] - (k01_21) * A[1]; - e2[-1] = (k01_21)*A[0] + (k00_20) * A[1]; - - A += k1; - - k00_20 = e0[-2] - e2[-2]; - k01_21 = e0[-3] - e2[-3]; - e0[-2] += e2[-2];//e0[-2] = e0[-2] + e2[-2]; - e0[-3] += e2[-3];//e0[-3] = e0[-3] + e2[-3]; - e2[-2] = (k00_20)*A[0] - (k01_21) * A[1]; - e2[-3] = (k01_21)*A[0] + (k00_20) * A[1]; - - A += k1; - - k00_20 = e0[-4] - e2[-4]; - k01_21 = e0[-5] - e2[-5]; - e0[-4] += e2[-4];//e0[-4] = e0[-4] + e2[-4]; - e0[-5] += e2[-5];//e0[-5] = e0[-5] + e2[-5]; - e2[-4] = (k00_20)*A[0] - (k01_21) * A[1]; - e2[-5] = (k01_21)*A[0] + (k00_20) * A[1]; - - A += k1; - - k00_20 = e0[-6] - e2[-6]; - k01_21 = e0[-7] - e2[-7]; - e0[-6] += e2[-6];//e0[-6] = e0[-6] + e2[-6]; - e0[-7] += e2[-7];//e0[-7] = e0[-7] + e2[-7]; - e2[-6] = (k00_20)*A[0] - (k01_21) * A[1]; - e2[-7] = (k01_21)*A[0] + (k00_20) * A[1]; - - e0 -= 8; - e2 -= 8; - - A += k1; - } -} - -static void imdct_step3_inner_s_loop(int n, float *e, int i_off, int k_off, float *A, int a_off, int k0) -{ - int i; - float A0 = A[0]; - float A1 = A[0+1]; - float A2 = A[0+a_off]; - float A3 = A[0+a_off+1]; - float A4 = A[0+a_off*2+0]; - float A5 = A[0+a_off*2+1]; - float A6 = A[0+a_off*3+0]; - float A7 = A[0+a_off*3+1]; - - float k00,k11; - - float *ee0 = e +i_off; - float *ee2 = ee0+k_off; - - for (i=n; i > 0; --i) { - k00 = ee0[ 0] - ee2[ 0]; - k11 = ee0[-1] - ee2[-1]; - ee0[ 0] = ee0[ 0] + ee2[ 0]; - ee0[-1] = ee0[-1] + ee2[-1]; - ee2[ 0] = (k00) * A0 - (k11) * A1; - ee2[-1] = (k11) * A0 + (k00) * A1; - - k00 = ee0[-2] - ee2[-2]; - k11 = ee0[-3] - ee2[-3]; - ee0[-2] = ee0[-2] + ee2[-2]; - ee0[-3] = ee0[-3] + ee2[-3]; - ee2[-2] = (k00) * A2 - (k11) * A3; - ee2[-3] = (k11) * A2 + (k00) * A3; - - k00 = ee0[-4] - ee2[-4]; - k11 = ee0[-5] - ee2[-5]; - ee0[-4] = ee0[-4] + ee2[-4]; - ee0[-5] = ee0[-5] + ee2[-5]; - ee2[-4] = (k00) * A4 - (k11) * A5; - ee2[-5] = (k11) * A4 + (k00) * A5; - - k00 = ee0[-6] - ee2[-6]; - k11 = ee0[-7] - ee2[-7]; - ee0[-6] = ee0[-6] + ee2[-6]; - ee0[-7] = ee0[-7] + ee2[-7]; - ee2[-6] = (k00) * A6 - (k11) * A7; - ee2[-7] = (k11) * A6 + (k00) * A7; - - ee0 -= k0; - ee2 -= k0; - } -} - -static __forceinline void iter_54(float *z) -{ - float k00,k11,k22,k33; - float y0,y1,y2,y3; - - k00 = z[ 0] - z[-4]; - y0 = z[ 0] + z[-4]; - y2 = z[-2] + z[-6]; - k22 = z[-2] - z[-6]; - - z[-0] = y0 + y2; // z0 + z4 + z2 + z6 - z[-2] = y0 - y2; // z0 + z4 - z2 - z6 - - // done with y0,y2 - - k33 = z[-3] - z[-7]; - - z[-4] = k00 + k33; // z0 - z4 + z3 - z7 - z[-6] = k00 - k33; // z0 - z4 - z3 + z7 - - // done with k33 - - k11 = z[-1] - z[-5]; - y1 = z[-1] + z[-5]; - y3 = z[-3] + z[-7]; - - z[-1] = y1 + y3; // z1 + z5 + z3 + z7 - z[-3] = y1 - y3; // z1 + z5 - z3 - z7 - z[-5] = k11 - k22; // z1 - z5 + z2 - z6 - z[-7] = k11 + k22; // z1 - z5 - z2 + z6 -} - -static void imdct_step3_inner_s_loop_ld654(int n, float *e, int i_off, float *A, int base_n) { - //int k_off = -8; - int a_off = base_n >> 3; - float A2 = A[0+a_off]; - float *z = e + i_off; - float *base = z - 16 * n; - - while (z > base) { - float k00,k11; - - k00 = z[-0] - z[-8]; - k11 = z[-1] - z[-9]; - z[-0] = z[-0] + z[-8]; - z[-1] = z[-1] + z[-9]; - z[-8] = k00; - z[-9] = k11 ; - - k00 = z[ -2] - z[-10]; - k11 = z[ -3] - z[-11]; - z[ -2] = z[ -2] + z[-10]; - z[ -3] = z[ -3] + z[-11]; - z[-10] = (k00+k11) * A2; - z[-11] = (k11-k00) * A2; - - k00 = z[-12] - z[ -4]; // reverse to avoid a unary negation - k11 = z[ -5] - z[-13]; - z[ -4] = z[ -4] + z[-12]; - z[ -5] = z[ -5] + z[-13]; - z[-12] = k11; - z[-13] = k00; - - k00 = z[-14] - z[ -6]; // reverse to avoid a unary negation - k11 = z[ -7] - z[-15]; - z[ -6] = z[ -6] + z[-14]; - z[ -7] = z[ -7] + z[-15]; - z[-14] = (k00+k11) * A2; - z[-15] = (k00-k11) * A2; - - iter_54(z); - iter_54(z-8); - z -= 16; - } -} - -static void inverse_mdct(float *buffer, int n, vorb *f, int blocktype) { - int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l; - //int n3_4 = n - n4;- int ld; - // @OPTIMIZE: reduce register pressure by using fewer variables? - int save_point = temp_alloc_save(f); - float *buf2 = (float *) temp_alloc(f, n2 * sizeof(*buf2)); - float *u=NULL,*v=NULL; - // twiddle factors - float *A = f->A[blocktype]; - - // IMDCT algorithm from "The use of multirate filter banks for coding of high quality digital audio" - // See notes about bugs in that paper in less-optimal implementation 'inverse_mdct_old' after this function. - - // kernel from paper - - - // merged: - // copy and reflect spectral data - // step 0 - - // note that it turns out that the items added together during - // this step are, in fact, being added to themselves (as reflected - // by step 0). inexplicable inefficiency! this became obvious - // once I combined the passes. - - // so there's a missing 'times 2' here (for adding X to itself). - // this propogates through linearly to the end, where the numbers - // are 1/2 too small, and need to be compensated for. - - { - float *d,*e, *AA, *e_stop; - d = &buf2[n2-2]; - AA = A; - e = &buffer[0]; - e_stop = &buffer[n2]; - while (e != e_stop) { - d[1] = (e[0] * AA[0] - e[2]*AA[1]); - d[0] = (e[0] * AA[1] + e[2]*AA[0]); - d -= 2; - AA += 2; - e += 4; - } - - e = &buffer[n2-3]; - while (d >= buf2) { - d[1] = (-e[2] * AA[0] - -e[0]*AA[1]); - d[0] = (-e[2] * AA[1] + -e[0]*AA[0]); - d -= 2; - AA += 2; - e -= 4; - } - } - - // now we use symbolic names for these, so that we can - // possibly swap their meaning as we change which operations - // are in place - - u = buffer; - v = buf2; - - // step 2 (paper output is w, now u) - // this could be in place, but the data ends up in the wrong - // place... _somebody_'s got to swap it, so this is nominated - { - float *AA = &A[n2-8]; - float *d0,*d1, *e0, *e1; - - e0 = &v[n4]; - e1 = &v[0]; - - d0 = &u[n4]; - d1 = &u[0]; - - while (AA >= A) { - float v40_20, v41_21; - - v41_21 = e0[1] - e1[1]; - v40_20 = e0[0] - e1[0]; - d0[1] = e0[1] + e1[1]; - d0[0] = e0[0] + e1[0]; - d1[1] = v41_21*AA[4] - v40_20*AA[5]; - d1[0] = v40_20*AA[4] + v41_21*AA[5]; - - v41_21 = e0[3] - e1[3]; - v40_20 = e0[2] - e1[2]; - d0[3] = e0[3] + e1[3]; - d0[2] = e0[2] + e1[2]; - d1[3] = v41_21*AA[0] - v40_20*AA[1]; - d1[2] = v40_20*AA[0] + v41_21*AA[1]; - - AA -= 8; - - d0 += 4; - d1 += 4; - e0 += 4; - e1 += 4; - } - } - - // step 3 - ld = ilog(n) - 1; // ilog is off-by-one from normal definitions - - // optimized step 3: - - // the original step3 loop can be nested r inside s or s inside r; - // it's written originally as s inside r, but this is dumb when r - // iterates many times, and s few. So I have two copies of it and - // switch between them halfway. - - // this is iteration 0 of step 3 - imdct_step3_iter0_loop(n >> 4, u, n2-1-n4*0, -(n >> 3), A); - imdct_step3_iter0_loop(n >> 4, u, n2-1-n4*1, -(n >> 3), A); - - // this is iteration 1 of step 3 - imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*0, -(n >> 4), A, 16); - imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*1, -(n >> 4), A, 16); - imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*2, -(n >> 4), A, 16); - imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*3, -(n >> 4), A, 16); - - l=2; - for (; l < (ld-3)>>1; ++l) { - int k0 = n >> (l+2), k0_2 = k0>>1; - int lim = 1 << (l+1); - int i; - for (i=0; i < lim; ++i) - imdct_step3_inner_r_loop(n >> (l+4), u, n2-1 - k0*i, -k0_2, A, 1 << (l+3)); - } - - for (; l < ld-6; ++l) { - int k0 = n >> (l+2), k1 = 1 << (l+3), k0_2 = k0>>1; - int rlim = n >> (l+6), r; - int lim = 1 << (l+1); - int i_off; - float *A0 = A; - i_off = n2-1; - for (r=rlim; r > 0; --r) { - imdct_step3_inner_s_loop(lim, u, i_off, -k0_2, A0, k1, k0); - A0 += k1*4; - i_off -= 8; - } - } - - // iterations with count: - // ld-6,-5,-4 all interleaved together - // the big win comes from getting rid of needless flops - // due to the constants on pass 5 & 4 being all 1 and 0; - // combining them to be simultaneous to improve cache made little difference - imdct_step3_inner_s_loop_ld654(n >> 5, u, n2-1, A, n); - - // output is u - - // step 4, 5, and 6 - // cannot be in-place because of step 5 - { - uint16 *bitrev = f->bit_reverse[blocktype]; - // weirdly, I'd have thought reading sequentially and writing - // erratically would have been better than vice-versa, but in - // fact that's not what my testing showed. (That is, with - // j = bitreverse(i), do you read i and write j, or read j and write i.) - - float *d0 = &v[n4-4]; - float *d1 = &v[n2-4]; - while (d0 >= v) { - int k4; - - k4 = bitrev[0]; - d1[3] = u[k4+0]; - d1[2] = u[k4+1]; - d0[3] = u[k4+2]; - d0[2] = u[k4+3]; - - k4 = bitrev[1]; - d1[1] = u[k4+0]; - d1[0] = u[k4+1]; - d0[1] = u[k4+2]; - d0[0] = u[k4+3]; - - d0 -= 4; - d1 -= 4; - bitrev += 2; - } - } - // (paper output is u, now v) - - - // data must be in buf2 - assert(v == buf2); - - // step 7 (paper output is v, now v) - // this is now in place - { - float *C = f->C[blocktype]; - float *d, *e; - - d = v; - e = v + n2 - 4; - - while (d < e) { - float a02,a11,b0,b1,b2,b3; - - a02 = d[0] - e[2]; - a11 = d[1] + e[3]; - - b0 = C[1]*a02 + C[0]*a11; - b1 = C[1]*a11 - C[0]*a02; - - b2 = d[0] + e[ 2]; - b3 = d[1] - e[ 3]; - - d[0] = b2 + b0; - d[1] = b3 + b1; - e[2] = b2 - b0; - e[3] = b1 - b3; - - a02 = d[2] - e[0]; - a11 = d[3] + e[1]; - - b0 = C[3]*a02 + C[2]*a11; - b1 = C[3]*a11 - C[2]*a02; - - b2 = d[2] + e[ 0]; - b3 = d[3] - e[ 1]; - - d[2] = b2 + b0; - d[3] = b3 + b1; - e[0] = b2 - b0; - e[1] = b1 - b3; - - C += 4; - d += 4; - e -= 4; - } - } - - // data must be in buf2 - - - // step 8+decode (paper output is X, now buffer) - // this generates pairs of data a la 8 and pushes them directly through - // the decode kernel (pushing rather than pulling) to avoid having - // to make another pass later - - // this cannot POSSIBLY be in place, so we refer to the buffers directly - - { - float *d0,*d1,*d2,*d3; - - float *B = f->B[blocktype] + n2 - 8; - float *e = buf2 + n2 - 8; - d0 = &buffer[0]; - d1 = &buffer[n2-4]; - d2 = &buffer[n2]; - d3 = &buffer[n-4]; - while (e >= v) { - float p0,p1,p2,p3; - - p3 = e[6]*B[7] - e[7]*B[6]; - p2 = -e[6]*B[6] - e[7]*B[7]; - - d0[0] = p3; - d1[3] = - p3; - d2[0] = p2; - d3[3] = p2; - - p1 = e[4]*B[5] - e[5]*B[4]; - p0 = -e[4]*B[4] - e[5]*B[5]; - - d0[1] = p1; - d1[2] = - p1; - d2[1] = p0; - d3[2] = p0; - - p3 = e[2]*B[3] - e[3]*B[2]; - p2 = -e[2]*B[2] - e[3]*B[3]; - - d0[2] = p3; - d1[1] = - p3; - d2[2] = p2; - d3[1] = p2; - - p1 = e[0]*B[1] - e[1]*B[0]; - p0 = -e[0]*B[0] - e[1]*B[1]; - - d0[3] = p1; - d1[0] = - p1; - d2[3] = p0; - d3[0] = p0; - - B -= 8; - e -= 8; - d0 += 4; - d2 += 4; - d1 -= 4; - d3 -= 4; - } - } - - temp_alloc_restore(f,save_point); -} - -#if 0 -// this is the original version of the above code, if you want to optimize it from scratch -void inverse_mdct_naive(float *buffer, int n) -{ - float s; - float A[1 << 12], B[1 << 12], C[1 << 11]; - int i,k,k2,k4, n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l; - int n3_4 = n - n4, ld; - // how can they claim this only uses N words?! - // oh, because they're only used sparsely, whoops - float u[1 << 13], X[1 << 13], v[1 << 13], w[1 << 13]; - // set up twiddle factors - - for (k=k2=0; k < n4; ++k,k2+=2) { - A[k2 ] = (float) cos(4*k*M_PI/n); - A[k2+1] = (float) -sin(4*k*M_PI/n); - B[k2 ] = (float) cos((k2+1)*M_PI/n/2); - B[k2+1] = (float) sin((k2+1)*M_PI/n/2); - } - for (k=k2=0; k < n8; ++k,k2+=2) { - C[k2 ] = (float) cos(2*(k2+1)*M_PI/n); - C[k2+1] = (float) -sin(2*(k2+1)*M_PI/n); - } - - // IMDCT algorithm from "The use of multirate filter banks for coding of high quality digital audio" - // Note there are bugs in that pseudocode, presumably due to them attempting - // to rename the arrays nicely rather than representing the way their actual - // implementation bounces buffers back and forth. As a result, even in the - // "some formulars corrected" version, a direct implementation fails. These - // are noted below as "paper bug". - - // copy and reflect spectral data - for (k=0; k < n2; ++k) u[k] = buffer[k]; - for ( ; k < n ; ++k) u[k] = -buffer[n - k - 1]; - // kernel from paper - // step 1 - for (k=k2=k4=0; k < n4; k+=1, k2+=2, k4+=4) { - v[n-k4-1] = (u[k4] - u[n-k4-1]) * A[k2] - (u[k4+2] - u[n-k4-3])*A[k2+1]; - v[n-k4-3] = (u[k4] - u[n-k4-1]) * A[k2+1] + (u[k4+2] - u[n-k4-3])*A[k2]; - } - // step 2 - for (k=k4=0; k < n8; k+=1, k4+=4) { - w[n2+3+k4] = v[n2+3+k4] + v[k4+3]; - w[n2+1+k4] = v[n2+1+k4] + v[k4+1]; - w[k4+3] = (v[n2+3+k4] - v[k4+3])*A[n2-4-k4] - (v[n2+1+k4]-v[k4+1])*A[n2-3-k4]; - w[k4+1] = (v[n2+1+k4] - v[k4+1])*A[n2-4-k4] + (v[n2+3+k4]-v[k4+3])*A[n2-3-k4]; - } - // step 3 - ld = ilog(n) - 1; // ilog is off-by-one from normal definitions - for (l=0; l < ld-3; ++l) { - int k0 = n >> (l+2), k1 = 1 << (l+3); - int rlim = n >> (l+4), r4, r; - int s2lim = 1 << (l+2), s2; - for (r=r4=0; r < rlim; r4+=4,++r) { - for (s2=0; s2 < s2lim; s2+=2) { - u[n-1-k0*s2-r4] = w[n-1-k0*s2-r4] + w[n-1-k0*(s2+1)-r4]; - u[n-3-k0*s2-r4] = w[n-3-k0*s2-r4] + w[n-3-k0*(s2+1)-r4]; - u[n-1-k0*(s2+1)-r4] = (w[n-1-k0*s2-r4] - w[n-1-k0*(s2+1)-r4]) * A[r*k1] - - (w[n-3-k0*s2-r4] - w[n-3-k0*(s2+1)-r4]) * A[r*k1+1]; - u[n-3-k0*(s2+1)-r4] = (w[n-3-k0*s2-r4] - w[n-3-k0*(s2+1)-r4]) * A[r*k1] - + (w[n-1-k0*s2-r4] - w[n-1-k0*(s2+1)-r4]) * A[r*k1+1]; - } - } - if (l+1 < ld-3) { - // paper bug: ping-ponging of u&w here is omitted - memcpy(w, u, sizeof(u)); - } - } - - // step 4 - for (i=0; i < n8; ++i) { - int j = bit_reverse(i) >> (32-ld+3); - assert(j < n8); - if (i == j) { - // paper bug: original code probably swapped in place; if copying, - // need to directly copy in this case - int i8 = i << 3; - v[i8+1] = u[i8+1]; - v[i8+3] = u[i8+3]; - v[i8+5] = u[i8+5]; - v[i8+7] = u[i8+7]; - } else if (i < j) { - int i8 = i << 3, j8 = j << 3; - v[j8+1] = u[i8+1], v[i8+1] = u[j8 + 1]; - v[j8+3] = u[i8+3], v[i8+3] = u[j8 + 3]; - v[j8+5] = u[i8+5], v[i8+5] = u[j8 + 5]; - v[j8+7] = u[i8+7], v[i8+7] = u[j8 + 7]; - } - } - // step 5 - for (k=0; k < n2; ++k) { - w[k] = v[k*2+1]; - } - // step 6 - for (k=k2=k4=0; k < n8; ++k, k2 += 2, k4 += 4) { - u[n-1-k2] = w[k4]; - u[n-2-k2] = w[k4+1]; - u[n3_4 - 1 - k2] = w[k4+2]; - u[n3_4 - 2 - k2] = w[k4+3]; - } - // step 7 - for (k=k2=0; k < n8; ++k, k2 += 2) { - v[n2 + k2 ] = ( u[n2 + k2] + u[n-2-k2] + C[k2+1]*(u[n2+k2]-u[n-2-k2]) + C[k2]*(u[n2+k2+1]+u[n-2-k2+1]))/2; - v[n-2 - k2] = ( u[n2 + k2] + u[n-2-k2] - C[k2+1]*(u[n2+k2]-u[n-2-k2]) - C[k2]*(u[n2+k2+1]+u[n-2-k2+1]))/2; - v[n2+1+ k2] = ( u[n2+1+k2] - u[n-1-k2] + C[k2+1]*(u[n2+1+k2]+u[n-1-k2]) - C[k2]*(u[n2+k2]-u[n-2-k2]))/2; - v[n-1 - k2] = (-u[n2+1+k2] + u[n-1-k2] + C[k2+1]*(u[n2+1+k2]+u[n-1-k2]) - C[k2]*(u[n2+k2]-u[n-2-k2]))/2; - } - // step 8 - for (k=k2=0; k < n4; ++k,k2 += 2) { - X[k] = v[k2+n2]*B[k2 ] + v[k2+1+n2]*B[k2+1]; - X[n2-1-k] = v[k2+n2]*B[k2+1] - v[k2+1+n2]*B[k2 ]; - } - - // decode kernel to output - // determined the following value experimentally - // (by first figuring out what made inverse_mdct_slow work); then matching that here - // (probably vorbis encoder premultiplies by n or n/2, to save it on the decoder?) - s = 0.5; // theoretically would be n4 - - // [[[ note! the s value of 0.5 is compensated for by the B[] in the current code, - // so it needs to use the "old" B values to behave correctly, or else - // set s to 1.0 ]]] - for (i=0; i < n4 ; ++i) buffer[i] = s * X[i+n4]; - for ( ; i < n3_4; ++i) buffer[i] = -s * X[n3_4 - i - 1]; - for ( ; i < n ; ++i) buffer[i] = -s * X[i - n3_4]; -} -#endif - -static float *get_window(vorb *f, int len) -{ - len <<= 1; - if (len == f->blocksize_0) return f->window[0]; - if (len == f->blocksize_1) return f->window[1]; - assert(0); - return NULL; -} - -#ifndef STB_VORBIS_NO_DEFER_FLOOR -typedef int16 YTYPE; -#else -typedef int YTYPE; -#endif -static int do_floor(vorb *f, Mapping *map, int i, int n, float *target, YTYPE *finalY, uint8 *step2_flag) -{ - int n2 = n >> 1; - int s = map->chan[i].mux, floor; - floor = map->submap_floor[s]; - if (f->floor_types[floor] == 0) { - return error(f, VORBIS_invalid_stream); - } else { - Floor1 *g = &f->floor_config[floor].floor1; - int j,q; - int lx = 0, ly = finalY[0] * g->floor1_multiplier; - for (q=1; q < g->values; ++q) { - j = g->sorted_order[q]; - #ifndef STB_VORBIS_NO_DEFER_FLOOR - if (finalY[j] >= 0) - #else - if (step2_flag[j]) - #endif - { - int hy = finalY[j] * g->floor1_multiplier; - int hx = g->Xlist[j]; - draw_line(target, lx,ly, hx,hy, n2); - lx = hx, ly = hy; - } - } - if (lx < n2) - // optimization of: draw_line(target, lx,ly, n,ly, n2); - for (j=lx; j < n2; ++j) - LINE_OP(target[j], inverse_db_table[ly]); - } - return TRUE; -} - -static int vorbis_decode_initial(vorb *f, int *p_left_start, int *p_left_end, int *p_right_start, int *p_right_end, int *mode) -{ - Mode *m; - int i, n, prev, next, window_center; - f->channel_buffer_start = f->channel_buffer_end = 0; - - retry: - if (f->eof) return FALSE; - if (!maybe_start_packet(f)) - return FALSE; - // check packet type - if (get_bits(f,1) != 0) { - if (IS_PUSH_MODE(f)) - return error(f,VORBIS_bad_packet_type); - while (EOP != get8_packet(f)); - goto retry; - } - - if (f->alloc.alloc_buffer) - assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset); - - i = get_bits(f, ilog(f->mode_count-1)); - if (i == EOP) return FALSE; - if (i >= f->mode_count) return FALSE; - *mode = i; - m = f->mode_config + i; - if (m->blockflag) { - n = f->blocksize_1; - prev = get_bits(f,1); - next = get_bits(f,1); - } else { - prev = next = 0; - n = f->blocksize_0; - } - -// WINDOWING - - window_center = n >> 1; - if (m->blockflag && !prev) { - *p_left_start = (n - f->blocksize_0) >> 2; - *p_left_end = (n + f->blocksize_0) >> 2; - } else { - *p_left_start = 0; - *p_left_end = window_center; - } - if (m->blockflag && !next) { - *p_right_start = (n*3 - f->blocksize_0) >> 2; - *p_right_end = (n*3 + f->blocksize_0) >> 2; - } else { - *p_right_start = window_center; - *p_right_end = n; - } - return TRUE; -} - -static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start, int left_end, int right_start, int right_end, int *p_left) -{ - Mapping *map; - int i,j,k,n,n2; - int zero_channel[256]; - int really_zero_channel[256]; - int window_center; - -// WINDOWING - - n = f->blocksize[m->blockflag]; - window_center = n >> 1; - - map = &f->mapping[m->mapping]; - -// FLOORS - n2 = n >> 1; - - for (i=0; i < f->channels; ++i) { - int s = map->chan[i].mux, floor; - zero_channel[i] = FALSE; - floor = map->submap_floor[s]; - if (f->floor_types[floor] == 0) { - return error(f, VORBIS_invalid_stream); - } else { - Floor1 *g = &f->floor_config[floor].floor1; - if (get_bits(f, 1)) { - short *finalY; - uint8 step2_flag[256]; - static int range_list[4] = { 256, 128, 86, 64 }; - int range = range_list[g->floor1_multiplier-1]; - int offset = 2; - finalY = f->finalY[i]; - finalY[0] = get_bits(f, ilog(range)-1); - finalY[1] = get_bits(f, ilog(range)-1); - for (j=0; j < g->partitions; ++j) { - int pclass = g->partition_class_list[j]; - int cdim = g->class_dimensions[pclass]; - int cbits = g->class_subclasses[pclass]; - int csub = (1 << cbits)-1; - int cval = 0; - if (cbits) { - Codebook *c = f->codebooks + g->class_masterbooks[pclass]; - DECODE(cval,f,c); - } - for (k=0; k < cdim; ++k) { - int book = g->subclass_books[pclass][cval & csub]; - cval = cval >> cbits; - if (book >= 0) { - int temp; - Codebook *c = f->codebooks + book; - DECODE(temp,f,c); - finalY[offset++] = temp; - } else - finalY[offset++] = 0; - } - } - if (f->valid_bits == INVALID_BITS) goto error; // behavior according to spec - step2_flag[0] = step2_flag[1] = 1; - for (j=2; j < g->values; ++j) { - int low, high, pred, highroom, lowroom, room, val; - low = g->neighbors[j][0]; - high = g->neighbors[j][1]; - //neighbors(g->Xlist, j, &low, &high); - pred = predict_point(g->Xlist[j], g->Xlist[low], g->Xlist[high], finalY[low], finalY[high]); - val = finalY[j]; - highroom = range - pred; - lowroom = pred; - if (highroom < lowroom) - room = highroom * 2; - else - room = lowroom * 2; - if (val) { - step2_flag[low] = step2_flag[high] = 1; - step2_flag[j] = 1; - if (val >= room) - if (highroom > lowroom) - finalY[j] = val - lowroom + pred; - else - finalY[j] = pred - val + highroom - 1; - else - if (val & 1) - finalY[j] = pred - ((val+1)>>1); - else - finalY[j] = pred + (val>>1); - } else { - step2_flag[j] = 0; - finalY[j] = pred; - } - } - -#ifdef STB_VORBIS_NO_DEFER_FLOOR - do_floor(f, map, i, n, f->floor_buffers[i], finalY, step2_flag); -#else - // defer final floor computation until _after_ residue - for (j=0; j < g->values; ++j) { - if (!step2_flag[j]) - finalY[j] = -1; - } -#endif - } else { - error: - zero_channel[i] = TRUE; - } - // So we just defer everything else to later - - // at this point we've decoded the floor into buffer - } - } - // at this point we've decoded all floors - - if (f->alloc.alloc_buffer) - assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset); - - // re-enable coupled channels if necessary - memcpy(really_zero_channel, zero_channel, sizeof(really_zero_channel[0]) * f->channels); - for (i=0; i < map->coupling_steps; ++i) - if (!zero_channel[map->chan[i].magnitude] || !zero_channel[map->chan[i].angle]) { - zero_channel[map->chan[i].magnitude] = zero_channel[map->chan[i].angle] = FALSE; - } - -// RESIDUE DECODE - for (i=0; i < map->submaps; ++i) { - float *residue_buffers[STB_VORBIS_MAX_CHANNELS]; - int r,t; - uint8 do_not_decode[256]; - int ch = 0; - for (j=0; j < f->channels; ++j) { - if (map->chan[j].mux == i) { - if (zero_channel[j]) { - do_not_decode[ch] = TRUE; - residue_buffers[ch] = NULL; - } else { - do_not_decode[ch] = FALSE; - residue_buffers[ch] = f->channel_buffers[j]; - } - ++ch; - } - } - r = map->submap_residue[i]; - t = f->residue_types[r]; - decode_residue(f, residue_buffers, ch, n2, r, do_not_decode); - } - - if (f->alloc.alloc_buffer) - assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset); - -// INVERSE COUPLING - for (i = map->coupling_steps-1; i >= 0; --i) { - int n2 = n >> 1; - float *m = f->channel_buffers[map->chan[i].magnitude]; - float *a = f->channel_buffers[map->chan[i].angle ]; - for (j=0; j < n2; ++j) { - float a2,m2; - if (m[j] > 0) - if (a[j] > 0) - m2 = m[j], a2 = m[j] - a[j]; - else - a2 = m[j], m2 = m[j] + a[j]; - else - if (a[j] > 0) - m2 = m[j], a2 = m[j] + a[j]; - else - a2 = m[j], m2 = m[j] - a[j]; - m[j] = m2; - a[j] = a2; - } - } - - // finish decoding the floors -#ifndef STB_VORBIS_NO_DEFER_FLOOR - for (i=0; i < f->channels; ++i) { - if (really_zero_channel[i]) { - memset(f->channel_buffers[i], 0, sizeof(*f->channel_buffers[i]) * n2); - } else { - do_floor(f, map, i, n, f->channel_buffers[i], f->finalY[i], NULL); - } - } -#else - for (i=0; i < f->channels; ++i) { - if (really_zero_channel[i]) { - memset(f->channel_buffers[i], 0, sizeof(*f->channel_buffers[i]) * n2); - } else { - for (j=0; j < n2; ++j) - f->channel_buffers[i][j] *= f->floor_buffers[i][j]; - } - } -#endif - -// INVERSE MDCT - for (i=0; i < f->channels; ++i) - inverse_mdct(f->channel_buffers[i], n, f, m->blockflag); - - // this shouldn't be necessary, unless we exited on an error - // and want to flush to get to the next packet - flush_packet(f); - - if (f->first_decode) { - // assume we start so first non-discarded sample is sample 0 - // this isn't to spec, but spec would require us to read ahead - // and decode the size of all current frames--could be done, - // but presumably it's not a commonly used feature - f->current_loc = -n2; // start of first frame is positioned for discard - // we might have to discard samples "from" the next frame too, - // if we're lapping a large block then a small at the start? - f->discard_samples_deferred = n - right_end; - f->current_loc_valid = TRUE; - f->first_decode = FALSE; - } else if (f->discard_samples_deferred) { - left_start += f->discard_samples_deferred; - *p_left = left_start; - f->discard_samples_deferred = 0; - } else if (f->previous_length == 0 && f->current_loc_valid) { - // we're recovering from a seek... that means we're going to discard - // the samples from this packet even though we know our position from - // the last page header, so we need to update the position based on - // the discarded samples here - // but wait, the code below is going to add this in itself even - // on a discard, so we don't need to do it here... - } - - // check if we have ogg information about the sample # for this packet - if (f->last_seg_which == f->end_seg_with_known_loc) { - // if we have a valid current loc, and this is final: - if (f->current_loc_valid && (f->page_flag & PAGEFLAG_last_page)) { - uint32 current_end = f->known_loc_for_packet - (n-right_end); - // then let's infer the size of the (probably) short final frame - if (current_end < f->current_loc + right_end) { - if (current_end < f->current_loc) { - // negative truncation, that's impossible! - *len = 0; - } else { - *len = current_end - f->current_loc; - } - *len += left_start; - f->current_loc += *len; - return TRUE; - } - } - // otherwise, just set our sample loc - // guess that the ogg granule pos refers to the _middle_ of the - // last frame? - // set f->current_loc to the position of left_start - f->current_loc = f->known_loc_for_packet - (n2-left_start); - f->current_loc_valid = TRUE; - } - if (f->current_loc_valid) - f->current_loc += (right_start - left_start); - - if (f->alloc.alloc_buffer) - assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset); - *len = right_end; // ignore samples after the window goes to 0 - return TRUE; -} - -static int vorbis_decode_packet(vorb *f, int *len, int *p_left, int *p_right) -{ - int mode, left_end, right_end; - if (!vorbis_decode_initial(f, p_left, &left_end, p_right, &right_end, &mode)) return 0; - return vorbis_decode_packet_rest(f, len, f->mode_config + mode, *p_left, left_end, *p_right, right_end, p_left); -} - -static int vorbis_finish_frame(stb_vorbis *f, int len, int left, int right) -{ - int prev,i,j; - // we use right&left (the start of the right- and left-window sin()-regions) - // to determine how much to return, rather than inferring from the rules - // (same result, clearer code); 'left' indicates where our sin() window - // starts, therefore where the previous window's right edge starts, and - // therefore where to start mixing from the previous buffer. 'right' - // indicates where our sin() ending-window starts, therefore that's where - // we start saving, and where our returned-data ends. - - // mixin from previous window - if (f->previous_length) { - int i,j, n = f->previous_length; - float *w = get_window(f, n); - for (i=0; i < f->channels; ++i) { - for (j=0; j < n; ++j) - f->channel_buffers[i][left+j] = - f->channel_buffers[i][left+j]*w[ j] + - f->previous_window[i][ j]*w[n-1-j]; - } - } - - prev = f->previous_length; - - // last half of this data becomes previous window - f->previous_length = len - right; - - // @OPTIMIZE: could avoid this copy by double-buffering the - // output (flipping previous_window with channel_buffers), but - // then previous_window would have to be 2x as large, and - // channel_buffers couldn't be temp mem (although they're NOT - // currently temp mem, they could be (unless we want to level - // performance by spreading out the computation)) - for (i=0; i < f->channels; ++i) - for (j=0; right+j < len; ++j) - f->previous_window[i][j] = f->channel_buffers[i][right+j]; - - if (!prev) - // there was no previous packet, so this data isn't valid... - // this isn't entirely true, only the would-have-overlapped data - // isn't valid, but this seems to be what the spec requires - return 0; - - // truncate a short frame - if (len < right) right = len; - - f->samples_output += right-left; - - return right - left; -} - -static void vorbis_pump_first_frame(stb_vorbis *f) -{ - int len, right, left; - if (vorbis_decode_packet(f, &len, &left, &right)) - vorbis_finish_frame(f, len, left, right); -} - -#ifndef STB_VORBIS_NO_PUSHDATA_API -static int is_whole_packet_present(stb_vorbis *f, int end_page) -{ - // make sure that we have the packet available before continuing... - // this requires a full ogg parse, but we know we can fetch from f->stream - - // instead of coding this out explicitly, we could save the current read state, - // read the next packet with get8() until end-of-packet, check f->eof, then - // reset the state? but that would be slower, esp. since we'd have over 256 bytes - // of state to restore (primarily the page segment table) - - int s = f->next_seg, first = TRUE; - uint8 *p = f->stream; - - if (s != -1) { // if we're not starting the packet with a 'continue on next page' flag - for (; s < f->segment_count; ++s) { - p += f->segments[s]; - if (f->segments[s] < 255) // stop at first short segment - break; - } - // either this continues, or it ends it... - if (end_page) - if (s < f->segment_count-1) return error(f, VORBIS_invalid_stream); - if (s == f->segment_count) - s = -1; // set 'crosses page' flag - if (p > f->stream_end) return error(f, VORBIS_need_more_data); - first = FALSE; - } - for (; s == -1;) { - uint8 *q; - int n; - - // check that we have the page header ready - if (p + 26 >= f->stream_end) return error(f, VORBIS_need_more_data); - // validate the page - if (memcmp(p, ogg_page_header, 4)) return error(f, VORBIS_invalid_stream); - if (p[4] != 0) return error(f, VORBIS_invalid_stream); - if (first) { // the first segment must NOT have 'continued_packet', later ones MUST - if (f->previous_length) - if ((p[5] & PAGEFLAG_continued_packet)) return error(f, VORBIS_invalid_stream); - // if no previous length, we're resynching, so we can come in on a continued-packet, - // which we'll just drop - } else { - if (!(p[5] & PAGEFLAG_continued_packet)) return error(f, VORBIS_invalid_stream); - } - n = p[26]; // segment counts - q = p+27; // q points to segment table - p = q + n; // advance past header - // make sure we've read the segment table - if (p > f->stream_end) return error(f, VORBIS_need_more_data); - for (s=0; s < n; ++s) { - p += q[s]; - if (q[s] < 255) - break; - } - if (end_page) - if (s < n-1) return error(f, VORBIS_invalid_stream); - if (s == f->segment_count) - s = -1; // set 'crosses page' flag - if (p > f->stream_end) return error(f, VORBIS_need_more_data); - first = FALSE; - } - return TRUE; -} -#endif // !STB_VORBIS_NO_PUSHDATA_API - -static int start_decoder(vorb *f) -{ - uint8 header[6], x,y; - int len,i,j,k, max_submaps = 0; - int longest_floorlist=0; - - // first page, first packet - - if (!start_page(f)) return FALSE; - // validate page flag - if (!(f->page_flag & PAGEFLAG_first_page)) return error(f, VORBIS_invalid_first_page); - if (f->page_flag & PAGEFLAG_last_page) return error(f, VORBIS_invalid_first_page); - if (f->page_flag & PAGEFLAG_continued_packet) return error(f, VORBIS_invalid_first_page); - // check for expected packet length - if (f->segment_count != 1) return error(f, VORBIS_invalid_first_page); - if (f->segments[0] != 30) return error(f, VORBIS_invalid_first_page); - // read packet - // check packet header - if (get8(f) != VORBIS_packet_id) return error(f, VORBIS_invalid_first_page); - if (!getn(f, header, 6)) return error(f, VORBIS_unexpected_eof); - if (!vorbis_validate(header)) return error(f, VORBIS_invalid_first_page); - // vorbis_version - if (get32(f) != 0) return error(f, VORBIS_invalid_first_page); - f->channels = get8(f); if (!f->channels) return error(f, VORBIS_invalid_first_page); - if (f->channels > STB_VORBIS_MAX_CHANNELS) return error(f, VORBIS_too_many_channels); - f->sample_rate = get32(f); if (!f->sample_rate) return error(f, VORBIS_invalid_first_page); - get32(f); // bitrate_maximum - get32(f); // bitrate_nominal - get32(f); // bitrate_minimum - x = get8(f); - { int log0,log1; - log0 = x & 15; - log1 = x >> 4; - f->blocksize_0 = 1 << log0; - f->blocksize_1 = 1 << log1; - if (log0 < 6 || log0 > 13) return error(f, VORBIS_invalid_setup); - if (log1 < 6 || log1 > 13) return error(f, VORBIS_invalid_setup); - if (log0 > log1) return error(f, VORBIS_invalid_setup); - } - - // framing_flag - x = get8(f); - if (!(x & 1)) return error(f, VORBIS_invalid_first_page); - - // second packet! - if (!start_page(f)) return FALSE; - - if (!start_packet(f)) return FALSE; - do { - len = next_segment(f); - skip(f, len); - f->bytes_in_seg = 0; - } while (len); - - // third packet! - if (!start_packet(f)) return FALSE; - - #ifndef STB_VORBIS_NO_PUSHDATA_API - if (IS_PUSH_MODE(f)) { - if (!is_whole_packet_present(f, TRUE)) { - // convert error in ogg header to write type - if (f->error == VORBIS_invalid_stream) - f->error = VORBIS_invalid_setup; - return FALSE; - } - } - #endif - - crc32_init(); // always init it, to avoid multithread race conditions - - if (get8_packet(f) != VORBIS_packet_setup) return error(f, VORBIS_invalid_setup); - for (i=0; i < 6; ++i) header[i] = get8_packet(f); - if (!vorbis_validate(header)) return error(f, VORBIS_invalid_setup); - - // codebooks - - f->codebook_count = get_bits(f,8) + 1; - f->codebooks = (Codebook *) setup_malloc(f, sizeof(*f->codebooks) * f->codebook_count); - if (f->codebooks == NULL) return error(f, VORBIS_outofmem); - memset(f->codebooks, 0, sizeof(*f->codebooks) * f->codebook_count); - for (i=0; i < f->codebook_count; ++i) { - uint32 *values; - int ordered, sorted_count; - int total=0; - uint8 *lengths; - Codebook *c = f->codebooks+i; - x = get_bits(f, 8); if (x != 0x42) return error(f, VORBIS_invalid_setup); - x = get_bits(f, 8); if (x != 0x43) return error(f, VORBIS_invalid_setup); - x = get_bits(f, 8); if (x != 0x56) return error(f, VORBIS_invalid_setup); - x = get_bits(f, 8); - c->dimensions = (get_bits(f, 8)<<8) + x; - x = get_bits(f, 8); - y = get_bits(f, 8); - c->entries = (get_bits(f, 8)<<16) + (y<<8) + x; - ordered = get_bits(f,1); - c->sparse = ordered ? 0 : get_bits(f,1); - - if (c->sparse) - lengths = (uint8 *) setup_temp_malloc(f, c->entries); - else - lengths = c->codeword_lengths = (uint8 *) setup_malloc(f, c->entries); - - if (!lengths) return error(f, VORBIS_outofmem); - - if (ordered) { - int current_entry = 0; - int current_length = get_bits(f,5) + 1; - while (current_entry < c->entries) { - int limit = c->entries - current_entry; - int n = get_bits(f, ilog(limit)); - if (current_entry + n > (int) c->entries) { return error(f, VORBIS_invalid_setup); } - memset(lengths + current_entry, current_length, n); - current_entry += n; - ++current_length; - } - } else { - for (j=0; j < c->entries; ++j) { - int present = c->sparse ? get_bits(f,1) : 1; - if (present) { - lengths[j] = get_bits(f, 5) + 1; - ++total; - } else { - lengths[j] = NO_CODE; - } - } - } - - if (c->sparse && total >= c->entries >> 2) { - // convert sparse items to non-sparse! - if (c->entries > (int) f->setup_temp_memory_required) - f->setup_temp_memory_required = c->entries; - - c->codeword_lengths = (uint8 *) setup_malloc(f, c->entries); - memcpy(c->codeword_lengths, lengths, c->entries); - setup_temp_free(f, lengths, c->entries); // note this is only safe if there have been no intervening temp mallocs! - lengths = c->codeword_lengths; - c->sparse = 0; - } - - // compute the size of the sorted tables - if (c->sparse) { - sorted_count = total; - //assert(total != 0); - } else { - sorted_count = 0; - #ifndef STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH - for (j=0; j < c->entries; ++j) - if (lengths[j] > STB_VORBIS_FAST_HUFFMAN_LENGTH && lengths[j] != NO_CODE) - ++sorted_count; - #endif - } - - c->sorted_entries = sorted_count; - values = NULL; - - if (!c->sparse) { - c->codewords = (uint32 *) setup_malloc(f, sizeof(c->codewords[0]) * c->entries); - if (!c->codewords) return error(f, VORBIS_outofmem); - } else { - unsigned int size; - if (c->sorted_entries) { - c->codeword_lengths = (uint8 *) setup_malloc(f, c->sorted_entries); - if (!c->codeword_lengths) return error(f, VORBIS_outofmem); - c->codewords = (uint32 *) setup_temp_malloc(f, sizeof(*c->codewords) * c->sorted_entries); - if (!c->codewords) return error(f, VORBIS_outofmem); - values = (uint32 *) setup_temp_malloc(f, sizeof(*values) * c->sorted_entries); - if (!values) return error(f, VORBIS_outofmem); - } - size = c->entries + (sizeof(*c->codewords) + sizeof(*values)) * c->sorted_entries; - if (size > f->setup_temp_memory_required) - f->setup_temp_memory_required = size; - } - - if (!compute_codewords(c, lengths, c->entries, values)) { - if (c->sparse) setup_temp_free(f, values, 0); - return error(f, VORBIS_invalid_setup); - } - - if (c->sorted_entries) { - // allocate an extra slot for sentinels - c->sorted_codewords = (uint32 *) setup_malloc(f, sizeof(*c->sorted_codewords) * (c->sorted_entries+1)); - // allocate an extra slot at the front so that c->sorted_values[-1] is defined - // so that we can catch that case without an extra if - c->sorted_values = ( int *) setup_malloc(f, sizeof(*c->sorted_values ) * (c->sorted_entries+1)); - if (c->sorted_values) { ++c->sorted_values; c->sorted_values[-1] = -1; } - compute_sorted_huffman(c, lengths, values); - } - - if (c->sparse) { - setup_temp_free(f, values, sizeof(*values)*c->sorted_entries); - setup_temp_free(f, c->codewords, sizeof(*c->codewords)*c->sorted_entries); - setup_temp_free(f, lengths, c->entries); - c->codewords = NULL; - } - - compute_accelerated_huffman(c); - - c->lookup_type = get_bits(f, 4); - if (c->lookup_type > 2) return error(f, VORBIS_invalid_setup); - if (c->lookup_type > 0) { - uint16 *mults; - c->minimum_value = float32_unpack(get_bits(f, 32)); - c->delta_value = float32_unpack(get_bits(f, 32)); - c->value_bits = get_bits(f, 4)+1; - c->sequence_p = get_bits(f,1); - if (c->lookup_type == 1) { - c->lookup_values = lookup1_values(c->entries, c->dimensions); - } else { - c->lookup_values = c->entries * c->dimensions; - } - mults = (uint16 *) setup_temp_malloc(f, sizeof(mults[0]) * c->lookup_values); - if (mults == NULL) return error(f, VORBIS_outofmem); - for (j=0; j < (int) c->lookup_values; ++j) { - int q = get_bits(f, c->value_bits); - if (q == EOP) { setup_temp_free(f,mults,sizeof(mults[0])*c->lookup_values); return error(f, VORBIS_invalid_setup); } - mults[j] = q; - } - -#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK - if (c->lookup_type == 1) { - int len, sparse = c->sparse; - // pre-expand the lookup1-style multiplicands, to avoid a divide in the inner loop - if (sparse) { - if (c->sorted_entries == 0) goto skip; - c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->sorted_entries * c->dimensions); - } else - c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->entries * c->dimensions); - if (c->multiplicands == NULL) { setup_temp_free(f,mults,sizeof(mults[0])*c->lookup_values); return error(f, VORBIS_outofmem); } - len = sparse ? c->sorted_entries : c->entries; - for (j=0; j < len; ++j) { - int z = sparse ? c->sorted_values[j] : j, div=1; - for (k=0; k < c->dimensions; ++k) { - int off = (z / div) % c->lookup_values; - c->multiplicands[j*c->dimensions + k] = - #ifndef STB_VORBIS_CODEBOOK_FLOATS - mults[off]; - #else - mults[off]*c->delta_value + c->minimum_value; - // in this case (and this case only) we could pre-expand c->sequence_p, - // and throw away the decode logic for it; have to ALSO do - // it in the case below, but it can only be done if - // STB_VORBIS_CODEBOOK_FLOATS - // !STB_VORBIS_DIVIDES_IN_CODEBOOK - #endif - div *= c->lookup_values; - } - } - setup_temp_free(f, mults,sizeof(mults[0])*c->lookup_values); - c->lookup_type = 2; - } - else -#endif - { - c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->lookup_values); - #ifndef STB_VORBIS_CODEBOOK_FLOATS - memcpy(c->multiplicands, mults, sizeof(c->multiplicands[0]) * c->lookup_values); - #else - for (j=0; j < (int) c->lookup_values; ++j) - c->multiplicands[j] = mults[j] * c->delta_value + c->minimum_value; - setup_temp_free(f, mults,sizeof(mults[0])*c->lookup_values); - #endif - } - skip:; - - #ifdef STB_VORBIS_CODEBOOK_FLOATS - if (c->lookup_type == 2 && c->sequence_p) { - for (j=1; j < (int) c->lookup_values; ++j) - c->multiplicands[j] = c->multiplicands[j-1]; - c->sequence_p = 0; - } - #endif - } - } - - // time domain transfers (notused) - - x = get_bits(f, 6) + 1; - for (i=0; i < x; ++i) { - uint32 z = get_bits(f, 16); - if (z != 0) return error(f, VORBIS_invalid_setup); - } - - // Floors - f->floor_count = get_bits(f, 6)+1; - f->floor_config = (Floor *) setup_malloc(f, f->floor_count * sizeof(*f->floor_config)); - for (i=0; i < f->floor_count; ++i) { - f->floor_types[i] = get_bits(f, 16); - if (f->floor_types[i] > 1) return error(f, VORBIS_invalid_setup); - if (f->floor_types[i] == 0) { - Floor0 *g = &f->floor_config[i].floor0; - g->order = get_bits(f,8); - g->rate = get_bits(f,16); - g->bark_map_size = get_bits(f,16); - g->amplitude_bits = get_bits(f,6); - g->amplitude_offset = get_bits(f,8); - g->number_of_books = get_bits(f,4) + 1; - for (j=0; j < g->number_of_books; ++j) - g->book_list[j] = get_bits(f,8); - return error(f, VORBIS_feature_not_supported); - } else { - Point p[31*8+2]; - Floor1 *g = &f->floor_config[i].floor1; - int max_class = -1; - g->partitions = get_bits(f, 5); - for (j=0; j < g->partitions; ++j) { - g->partition_class_list[j] = get_bits(f, 4); - if (g->partition_class_list[j] > max_class) - max_class = g->partition_class_list[j]; - } - for (j=0; j <= max_class; ++j) { - g->class_dimensions[j] = get_bits(f, 3)+1; - g->class_subclasses[j] = get_bits(f, 2); - if (g->class_subclasses[j]) { - g->class_masterbooks[j] = get_bits(f, 8); - if (g->class_masterbooks[j] >= f->codebook_count) return error(f, VORBIS_invalid_setup); - } - for (k=0; k < 1 << g->class_subclasses[j]; ++k) { - g->subclass_books[j][k] = get_bits(f,8)-1; - if (g->subclass_books[j][k] >= f->codebook_count) return error(f, VORBIS_invalid_setup); - } - } - g->floor1_multiplier = get_bits(f,2)+1; - g->rangebits = get_bits(f,4); - g->Xlist[0] = 0; - g->Xlist[1] = 1 << g->rangebits; - g->values = 2; - for (j=0; j < g->partitions; ++j) { - int c = g->partition_class_list[j]; - for (k=0; k < g->class_dimensions[c]; ++k) { - g->Xlist[g->values] = get_bits(f, g->rangebits); - ++g->values; - } - } - // precompute the sorting - for (j=0; j < g->values; ++j) { - p[j].x = g->Xlist[j]; - p[j].y = j; - } - qsort(p, g->values, sizeof(p[0]), point_compare); - for (j=0; j < g->values; ++j) - g->sorted_order[j] = (uint8) p[j].y; - // precompute the neighbors - for (j=2; j < g->values; ++j) { - int low,hi; - neighbors(g->Xlist, j, &low,&hi); - g->neighbors[j][0] = low; - g->neighbors[j][1] = hi; - } - - if (g->values > longest_floorlist) - longest_floorlist = g->values; - } - } - - // Residue - f->residue_count = get_bits(f, 6)+1; - f->residue_config = (Residue *) setup_malloc(f, f->residue_count * sizeof(*f->residue_config)); - for (i=0; i < f->residue_count; ++i) { - uint8 residue_cascade[64]; - Residue *r = f->residue_config+i; - f->residue_types[i] = get_bits(f, 16); - if (f->residue_types[i] > 2) return error(f, VORBIS_invalid_setup); - r->begin = get_bits(f, 24); - r->end = get_bits(f, 24); - r->part_size = get_bits(f,24)+1; - r->classifications = get_bits(f,6)+1; - r->classbook = get_bits(f,8); - for (j=0; j < r->classifications; ++j) { - uint8 high_bits=0; - uint8 low_bits=get_bits(f,3); - if (get_bits(f,1)) - high_bits = get_bits(f,5); - residue_cascade[j] = high_bits*8 + low_bits; - } - r->residue_books = (short (*)[8]) setup_malloc(f, sizeof(r->residue_books[0]) * r->classifications); - for (j=0; j < r->classifications; ++j) { - for (k=0; k < 8; ++k) { - if (residue_cascade[j] & (1 << k)) { - r->residue_books[j][k] = get_bits(f, 8); - if (r->residue_books[j][k] >= f->codebook_count) return error(f, VORBIS_invalid_setup); - } else { - r->residue_books[j][k] = -1; - } - } - } - // precompute the classifications[] array to avoid inner-loop mod/divide - // call it 'classdata' since we already have r->classifications - r->classdata = (uint8 **) setup_malloc(f, sizeof(*r->classdata) * f->codebooks[r->classbook].entries); - if (!r->classdata) return error(f, VORBIS_outofmem); - memset(r->classdata, 0, sizeof(*r->classdata) * f->codebooks[r->classbook].entries); - for (j=0; j < f->codebooks[r->classbook].entries; ++j) { - int classwords = f->codebooks[r->classbook].dimensions; - int temp = j; - r->classdata[j] = (uint8 *) setup_malloc(f, sizeof(r->classdata[j][0]) * classwords); - for (k=classwords-1; k >= 0; --k) { - r->classdata[j][k] = temp % r->classifications; - temp /= r->classifications; - } - } - } - - f->mapping_count = get_bits(f,6)+1; - f->mapping = (Mapping *) setup_malloc(f, f->mapping_count * sizeof(*f->mapping)); - for (i=0; i < f->mapping_count; ++i) { - Mapping *m = f->mapping + i; - int mapping_type = get_bits(f,16); - if (mapping_type != 0) return error(f, VORBIS_invalid_setup); - m->chan = (MappingChannel *) setup_malloc(f, f->channels * sizeof(*m->chan)); - if (get_bits(f,1)) - m->submaps = get_bits(f,4); - else - m->submaps = 1; - if (m->submaps > max_submaps) - max_submaps = m->submaps; - if (get_bits(f,1)) { - m->coupling_steps = get_bits(f,8)+1; - for (k=0; k < m->coupling_steps; ++k) { - m->chan[k].magnitude = get_bits(f, ilog(f->channels)-1); - m->chan[k].angle = get_bits(f, ilog(f->channels)-1); - if (m->chan[k].magnitude >= f->channels) return error(f, VORBIS_invalid_setup); - if (m->chan[k].angle >= f->channels) return error(f, VORBIS_invalid_setup); - if (m->chan[k].magnitude == m->chan[k].angle) return error(f, VORBIS_invalid_setup); - } - } else - m->coupling_steps = 0; - - // reserved field - if (get_bits(f,2)) return error(f, VORBIS_invalid_setup); - if (m->submaps > 1) { - for (j=0; j < f->channels; ++j) { - m->chan[j].mux = get_bits(f, 4); - if (m->chan[j].mux >= m->submaps) return error(f, VORBIS_invalid_setup); - } - } else - // @SPECIFICATION: this case is missing from the spec - for (j=0; j < f->channels; ++j) - m->chan[j].mux = 0; - - for (j=0; j < m->submaps; ++j) { - get_bits(f,8); // discard - m->submap_floor[j] = get_bits(f,8); - m->submap_residue[j] = get_bits(f,8); - if (m->submap_floor[j] >= f->floor_count) return error(f, VORBIS_invalid_setup); - if (m->submap_residue[j] >= f->residue_count) return error(f, VORBIS_invalid_setup); - } - } - - // Modes - f->mode_count = get_bits(f, 6)+1; - for (i=0; i < f->mode_count; ++i) { - Mode *m = f->mode_config+i; - m->blockflag = get_bits(f,1); - m->windowtype = get_bits(f,16); - m->transformtype = get_bits(f,16); - m->mapping = get_bits(f,8); - if (m->windowtype != 0) return error(f, VORBIS_invalid_setup); - if (m->transformtype != 0) return error(f, VORBIS_invalid_setup); - if (m->mapping >= f->mapping_count) return error(f, VORBIS_invalid_setup); - } - - flush_packet(f); - - f->previous_length = 0; - - for (i=0; i < f->channels; ++i) { - f->channel_buffers[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1); - f->previous_window[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1/2); - f->finalY[i] = (int16 *) setup_malloc(f, sizeof(int16) * longest_floorlist); - #ifdef STB_VORBIS_NO_DEFER_FLOOR - f->floor_buffers[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1/2); - #endif - } - - if (!init_blocksize(f, 0, f->blocksize_0)) return FALSE; - if (!init_blocksize(f, 1, f->blocksize_1)) return FALSE; - f->blocksize[0] = f->blocksize_0; - f->blocksize[1] = f->blocksize_1; - -#ifdef STB_VORBIS_DIVIDE_TABLE - if (integer_divide_table[1][1]==0) - for (i=0; i < DIVTAB_NUMER; ++i) - for (j=1; j < DIVTAB_DENOM; ++j) - integer_divide_table[i][j] = i / j; -#endif - - // compute how much temporary memory is needed - - // 1. - { - uint32 imdct_mem = (f->blocksize_1 * sizeof(float) >> 1); - uint32 classify_mem; - int i,max_part_read=0; - for (i=0; i < f->residue_count; ++i) { - Residue *r = f->residue_config + i; - int n_read = r->end - r->begin; - int part_read = n_read / r->part_size; - if (part_read > max_part_read) - max_part_read = part_read; - } - #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE - classify_mem = f->channels * (sizeof(void*) + max_part_read * sizeof(uint8 *)); - #else - classify_mem = f->channels * (sizeof(void*) + max_part_read * sizeof(int *)); - #endif - - f->temp_memory_required = classify_mem; - if (imdct_mem > f->temp_memory_required) - f->temp_memory_required = imdct_mem; - } - - f->first_decode = TRUE; - - if (f->alloc.alloc_buffer) { - assert(f->temp_offset == f->alloc.alloc_buffer_length_in_bytes); - // check if there's enough temp memory so we don't error later - if (f->setup_offset + sizeof(*f) + f->temp_memory_required > (unsigned) f->temp_offset) - return error(f, VORBIS_outofmem); - } - - f->first_audio_page_offset = stb_vorbis_get_file_offset(f); - - return TRUE; -} - -static void vorbis_deinit(stb_vorbis *p) -{ - int i,j; - for (i=0; i < p->residue_count; ++i) { - Residue *r = p->residue_config+i; - if (r->classdata) { - for (j=0; j < p->codebooks[r->classbook].entries; ++j) - setup_free(p, r->classdata[j]); - setup_free(p, r->classdata); - } - setup_free(p, r->residue_books); - } - - if (p->codebooks) { - for (i=0; i < p->codebook_count; ++i) { - Codebook *c = p->codebooks + i; - setup_free(p, c->codeword_lengths); - setup_free(p, c->multiplicands); - setup_free(p, c->codewords); - setup_free(p, c->sorted_codewords); - // c->sorted_values[-1] is the first entry in the array - setup_free(p, c->sorted_values ? c->sorted_values-1 : NULL); - } - setup_free(p, p->codebooks); - } - setup_free(p, p->floor_config); - setup_free(p, p->residue_config); - for (i=0; i < p->mapping_count; ++i) - setup_free(p, p->mapping[i].chan); - setup_free(p, p->mapping); - for (i=0; i < p->channels; ++i) { - setup_free(p, p->channel_buffers[i]); - setup_free(p, p->previous_window[i]); - #ifdef STB_VORBIS_NO_DEFER_FLOOR - setup_free(p, p->floor_buffers[i]); - #endif - setup_free(p, p->finalY[i]); - } - for (i=0; i < 2; ++i) { - setup_free(p, p->A[i]); - setup_free(p, p->B[i]); - setup_free(p, p->C[i]); - setup_free(p, p->window[i]); - } - #ifndef STB_VORBIS_NO_STDIO - if (p->close_on_free) fclose(p->f); - #endif -} - -void stb_vorbis_close(stb_vorbis *p) -{ - if (p == NULL) return; - vorbis_deinit(p); - setup_free(p,p); -} - -static void vorbis_init(stb_vorbis *p, stb_vorbis_alloc *z) -{ - memset(p, 0, sizeof(*p)); // NULL out all malloc'd pointers to start - if (z) { - p->alloc = *z; - p->alloc.alloc_buffer_length_in_bytes = (p->alloc.alloc_buffer_length_in_bytes+3) & ~3; - p->temp_offset = p->alloc.alloc_buffer_length_in_bytes; - } - p->eof = 0; - p->error = VORBIS__no_error; - p->stream = NULL; - p->codebooks = NULL; - p->page_crc_tests = -1; - #ifndef STB_VORBIS_NO_STDIO - p->close_on_free = FALSE; - p->f = NULL; - #endif -} - -int stb_vorbis_get_sample_offset(stb_vorbis *f) -{ - if (f->current_loc_valid) - return f->current_loc; - else - return -1; -} - -stb_vorbis_info stb_vorbis_get_info(stb_vorbis *f) -{ - stb_vorbis_info d; - d.channels = f->channels; - d.sample_rate = f->sample_rate; - d.setup_memory_required = f->setup_memory_required; - d.setup_temp_memory_required = f->setup_temp_memory_required; - d.temp_memory_required = f->temp_memory_required; - d.max_frame_size = f->blocksize_1 >> 1; - return d; -} - -int stb_vorbis_get_error(stb_vorbis *f) -{ - int e = f->error; - f->error = VORBIS__no_error; - return e; -} - -static stb_vorbis * vorbis_alloc(stb_vorbis *f) -{ - stb_vorbis *p = (stb_vorbis *) setup_malloc(f, sizeof(*p)); - return p; -} - -#ifndef STB_VORBIS_NO_PUSHDATA_API - -void stb_vorbis_flush_pushdata(stb_vorbis *f) -{ - f->previous_length = 0; - f->page_crc_tests = 0; - f->discard_samples_deferred = 0; - f->current_loc_valid = FALSE; - f->first_decode = FALSE; - f->samples_output = 0; - f->channel_buffer_start = 0; - f->channel_buffer_end = 0; -} - -static int vorbis_search_for_page_pushdata(vorb *f, uint8 *data, int data_len) -{ - int i,n; - for (i=0; i < f->page_crc_tests; ++i) - f->scan[i].bytes_done = 0; - - // if we have room for more scans, search for them first, because - // they may cause us to stop early if their header is incomplete - if (f->page_crc_tests < STB_VORBIS_PUSHDATA_CRC_COUNT) { - if (data_len < 4) return 0; - data_len -= 3; // need to look for 4-byte sequence, so don't miss - // one that straddles a boundary - for (i=0; i < data_len; ++i) { - if (data[i] == 0x4f) { - if (0==memcmp(data+i, ogg_page_header, 4)) { - int j,len; - uint32 crc; - // make sure we have the whole page header - if (i+26 >= data_len || i+27+data[i+26] >= data_len) { - // only read up to this page start, so hopefully we'll - // have the whole page header start next time - data_len = i; - break; - } - // ok, we have it all; compute the length of the page - len = 27 + data[i+26]; - for (j=0; j < data[i+26]; ++j) - len += data[i+27+j]; - // scan everything up to the embedded crc (which we must 0) - crc = 0; - for (j=0; j < 22; ++j) - crc = crc32_update(crc, data[i+j]); - // now process 4 0-bytes - for ( ; j < 26; ++j) - crc = crc32_update(crc, 0); - // len is the total number of bytes we need to scan - n = f->page_crc_tests++; - f->scan[n].bytes_left = len-j; - f->scan[n].crc_so_far = crc; - f->scan[n].goal_crc = data[i+22] + (data[i+23] << 8) + (data[i+24]<<16) + (data[i+25]<<24); - // if the last frame on a page is continued to the next, then - // we can't recover the sample_loc immediately - if (data[i+27+data[i+26]-1] == 255) - f->scan[n].sample_loc = ~0; - else - f->scan[n].sample_loc = data[i+6] + (data[i+7] << 8) + (data[i+ 8]<<16) + (data[i+ 9]<<24); - f->scan[n].bytes_done = i+j; - if (f->page_crc_tests == STB_VORBIS_PUSHDATA_CRC_COUNT) - break; - // keep going if we still have room for more - } - } - } - } - - for (i=0; i < f->page_crc_tests;) { - uint32 crc; - int j; - int n = f->scan[i].bytes_done; - int m = f->scan[i].bytes_left; - if (m > data_len - n) m = data_len - n; - // m is the bytes to scan in the current chunk - crc = f->scan[i].crc_so_far; - for (j=0; j < m; ++j) - crc = crc32_update(crc, data[n+j]); - f->scan[i].bytes_left -= m; - f->scan[i].crc_so_far = crc; - if (f->scan[i].bytes_left == 0) { - // does it match? - if (f->scan[i].crc_so_far == f->scan[i].goal_crc) { - // Houston, we have page - data_len = n+m; // consumption amount is wherever that scan ended - f->page_crc_tests = -1; // drop out of page scan mode - f->previous_length = 0; // decode-but-don't-output one frame - f->next_seg = -1; // start a new page - f->current_loc = f->scan[i].sample_loc; // set the current sample location - // to the amount we'd have decoded had we decoded this page - f->current_loc_valid = f->current_loc != ~0; - return data_len; - } - // delete entry - f->scan[i] = f->scan[--f->page_crc_tests]; - } else { - ++i; - } - } - - return data_len; -} - -// return value: number of bytes we used -int stb_vorbis_decode_frame_pushdata( - stb_vorbis *f, // the file we're decoding - uint8 *data, int data_len, // the memory available for decoding - int *channels, // place to write number of float * buffers - float ***output, // place to write float ** array of float * buffers - int *samples // place to write number of output samples - ) -{ - int i; - int len,right,left; - - if (!IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing); - - if (f->page_crc_tests >= 0) { - *samples = 0; - return vorbis_search_for_page_pushdata(f, data, data_len); - } - - f->stream = data; - f->stream_end = data + data_len; - f->error = VORBIS__no_error; - - // check that we have the entire packet in memory - if (!is_whole_packet_present(f, FALSE)) { - *samples = 0; - return 0; - } - - if (!vorbis_decode_packet(f, &len, &left, &right)) { - // save the actual error we encountered - enum STBVorbisError error = f->error; - if (error == VORBIS_bad_packet_type) { - // flush and resynch - f->error = VORBIS__no_error; - while (get8_packet(f) != EOP) - if (f->eof) break; - *samples = 0; - return f->stream - data; - } - if (error == VORBIS_continued_packet_flag_invalid) { - if (f->previous_length == 0) { - // we may be resynching, in which case it's ok to hit one - // of these; just discard the packet - f->error = VORBIS__no_error; - while (get8_packet(f) != EOP) - if (f->eof) break; - *samples = 0; - return f->stream - data; - } - } - // if we get an error while parsing, what to do? - // well, it DEFINITELY won't work to continue from where we are! - stb_vorbis_flush_pushdata(f); - // restore the error that actually made us bail - f->error = error; - *samples = 0; - return 1; - } - - // success! - len = vorbis_finish_frame(f, len, left, right); - for (i=0; i < f->channels; ++i) - f->outputs[i] = f->channel_buffers[i] + left; - - if (channels) *channels = f->channels; - *samples = len; - *output = f->outputs; - return f->stream - data; -} - -stb_vorbis *stb_vorbis_open_pushdata( - unsigned char *data, int data_len, // the memory available for decoding - int *data_used, // only defined if result is not NULL - int *error, stb_vorbis_alloc *alloc) -{ - stb_vorbis *f, p; - vorbis_init(&p, alloc); - p.stream = data; - p.stream_end = data + data_len; - p.push_mode = TRUE; - if (!start_decoder(&p)) { - if (p.eof) - *error = VORBIS_need_more_data; - else - *error = p.error; - return NULL; - } - f = vorbis_alloc(&p); - if (f) { - *f = p; - *data_used = f->stream - data; - *error = 0; - return f; - } else { - vorbis_deinit(&p); - return NULL; - } -} -#endif // STB_VORBIS_NO_PUSHDATA_API - -unsigned int stb_vorbis_get_file_offset(stb_vorbis *f) -{ - #ifndef STB_VORBIS_NO_PUSHDATA_API - if (f->push_mode) return 0; - #endif - if (USE_MEMORY(f)) return f->stream - f->stream_start; - #ifndef STB_VORBIS_NO_STDIO - return ftell(f->f) - f->f_start; - #endif -} - -#ifndef STB_VORBIS_NO_PULLDATA_API -// -// DATA-PULLING API -// - -static uint32 vorbis_find_page(stb_vorbis *f, uint32 *end, uint32 *last) -{ - for(;;) { - int n; - if (f->eof) return 0; - n = get8(f); - if (n == 0x4f) { // page header - unsigned int retry_loc = stb_vorbis_get_file_offset(f); - int i; - // check if we're off the end of a file_section stream - if (retry_loc - 25 > f->stream_len) - return 0; - // check the rest of the header - for (i=1; i < 4; ++i) - if (get8(f) != ogg_page_header[i]) - break; - if (f->eof) return 0; - if (i == 4) { - uint8 header[27]; - uint32 i, crc, goal, len; - for (i=0; i < 4; ++i) - header[i] = ogg_page_header[i]; - for (; i < 27; ++i) - header[i] = get8(f); - if (f->eof) return 0; - if (header[4] != 0) goto invalid; - goal = header[22] + (header[23] << 8) + (header[24]<<16) + (header[25]<<24); - for (i=22; i < 26; ++i) - header[i] = 0; - crc = 0; - for (i=0; i < 27; ++i) - crc = crc32_update(crc, header[i]); - len = 0; - for (i=0; i < header[26]; ++i) { - int s = get8(f); - crc = crc32_update(crc, s); - len += s; - } - if (len && f->eof) return 0; - for (i=0; i < len; ++i) - crc = crc32_update(crc, get8(f)); - // finished parsing probable page - if (crc == goal) { - // we could now check that it's either got the last - // page flag set, OR it's followed by the capture - // pattern, but I guess TECHNICALLY you could have - // a file with garbage between each ogg page and recover - // from it automatically? So even though that paranoia - // might decrease the chance of an invalid decode by - // another 2^32, not worth it since it would hose those - // invalid-but-useful files? - if (end) - *end = stb_vorbis_get_file_offset(f); - if (last) { - if (header[5] & 0x04) - *last = 1; - else - *last = 0; - } - set_file_offset(f, retry_loc-1); - return 1; - } - } - invalid: - // not a valid page, so rewind and look for next one - set_file_offset(f, retry_loc); - } - } -} - -// seek is implemented with 'interpolation search'--this is like -// binary search, but we use the data values to estimate the likely -// location of the data item (plus a bit of a bias so when the -// estimation is wrong we don't waste overly much time) - -#define SAMPLE_unknown 0xffffffff - - -// ogg vorbis, in its insane infinite wisdom, only provides -// information about the sample at the END of the page. -// therefore we COULD have the data we need in the current -// page, and not know it. we could just use the end location -// as our only knowledge for bounds, seek back, and eventually -// the binary search finds it. or we can try to be smart and -// not waste time trying to locate more pages. we try to be -// smart, since this data is already in memory anyway, so -// doing needless I/O would be crazy! -static int vorbis_analyze_page(stb_vorbis *f, ProbedPage *z) -{ - uint8 header[27], lacing[255]; - uint8 packet_type[255]; - int num_packet, packet_start, previous =0; - int i,len; - uint32 samples; - - // record where the page starts - z->page_start = stb_vorbis_get_file_offset(f); - - // parse the header - getn(f, header, 27); - assert(header[0] == 'O' && header[1] == 'g' && header[2] == 'g' && header[3] == 'S'); - getn(f, lacing, header[26]); - - // determine the length of the payload - len = 0; - for (i=0; i < header[26]; ++i) - len += lacing[i]; - - // this implies where the page ends - z->page_end = z->page_start + 27 + header[26] + len; - - // read the last-decoded sample out of the data - z->last_decoded_sample = header[6] + (header[7] << 8) + (header[8] << 16) + (header[9] << 16); - - if (header[5] & 4) { - // if this is the last page, it's not possible to work - // backwards to figure out the first sample! whoops! fuck. - z->first_decoded_sample = SAMPLE_unknown; - set_file_offset(f, z->page_start); - return 1; - } - - // scan through the frames to determine the sample-count of each one... - // our goal is the sample # of the first fully-decoded sample on the - // page, which is the first decoded sample of the 2nd page - - num_packet=0; - - packet_start = ((header[5] & 1) == 0); - - for (i=0; i < header[26]; ++i) { - if (packet_start) { - uint8 n,b,m; - if (lacing[i] == 0) goto bail; // trying to read from zero-length packet - n = get8(f); - // if bottom bit is non-zero, we've got corruption - if (n & 1) goto bail; - n >>= 1; - b = ilog(f->mode_count-1); - m = n >> b; - n &= (1 << b)-1; - if (n >= f->mode_count) goto bail; - if (num_packet == 0 && f->mode_config[n].blockflag) - previous = (m & 1); - packet_type[num_packet++] = f->mode_config[n].blockflag; - skip(f, lacing[i]-1); - } else - skip(f, lacing[i]); - packet_start = (lacing[i] < 255); - } - - // now that we know the sizes of all the pages, we can start determining - // how much sample data there is. - - samples = 0; - - // for the last packet, we step by its whole length, because the definition - // is that we encoded the end sample loc of the 'last packet completed', - // where 'completed' refers to packets being split, and we are left to guess - // what 'end sample loc' means. we assume it means ignoring the fact that - // the last half of the data is useless without windowing against the next - // packet... (so it's not REALLY complete in that sense) - if (num_packet > 1) - samples += f->blocksize[packet_type[num_packet-1]]; - - for (i=num_packet-2; i >= 1; --i) { - // now, for this packet, how many samples do we have that - // do not overlap the following packet? - if (packet_type[i] == 1) - if (packet_type[i+1] == 1) - samples += f->blocksize_1 >> 1; - else - samples += ((f->blocksize_1 - f->blocksize_0) >> 2) + (f->blocksize_0 >> 1); - else - samples += f->blocksize_0 >> 1; - } - // now, at this point, we've rewound to the very beginning of the - // _second_ packet. if we entirely discard the first packet after - // a seek, this will be exactly the right sample number. HOWEVER! - // we can't as easily compute this number for the LAST page. The - // only way to get the sample offset of the LAST page is to use - // the end loc from the previous page. But what that returns us - // is _exactly_ the place where we get our first non-overlapped - // sample. (I think. Stupid spec for being ambiguous.) So for - // consistency it's better to do that here, too. However, that - // will then require us to NOT discard all of the first frame we - // decode, in some cases, which means an even weirder frame size - // and extra code. what a fucking pain. - - // we're going to discard the first packet if we - // start the seek here, so we don't care about it. (we could actually - // do better; if the first packet is long, and the previous packet - // is short, there's actually data in the first half of the first - // packet that doesn't need discarding... but not worth paying the - // effort of tracking that of that here and in the seeking logic) - // except crap, if we infer it from the _previous_ packet's end - // location, we DO need to use that definition... and we HAVE to - // infer the start loc of the LAST packet from the previous packet's - // end location. fuck you, ogg vorbis. - - z->first_decoded_sample = z->last_decoded_sample - samples; - - // restore file state to where we were - set_file_offset(f, z->page_start); - return 1; - - // restore file state to where we were - bail: - set_file_offset(f, z->page_start); - return 0; -} - -static int vorbis_seek_frame_from_page(stb_vorbis *f, uint32 page_start, uint32 first_sample, uint32 target_sample, int fine) -{ - int left_start, left_end, right_start, right_end, mode,i; - int frame=0; - uint32 frame_start; - int frames_to_skip, data_to_skip; - - // first_sample is the sample # of the first sample that doesn't - // overlap the previous page... note that this requires us to - // _partially_ discard the first packet! bleh. - set_file_offset(f, page_start); - - f->next_seg = -1; // force page resync - - frame_start = first_sample; - // frame start is where the previous packet's last decoded sample - // was, which corresponds to left_end... EXCEPT if the previous - // packet was long and this packet is short? Probably a bug here. - - - // now, we can start decoding frames... we'll only FAKE decode them, - // until we find the frame that contains our sample; then we'll rewind, - // and try again - for (;;) { - int start; - - if (!vorbis_decode_initial(f, &left_start, &left_end, &right_start, &right_end, &mode)) - return error(f, VORBIS_seek_failed); - - if (frame == 0) - start = left_end; - else - start = left_start; - - // the window starts at left_start; the last valid sample we generate - // before the next frame's window start is right_start-1 - if (target_sample < frame_start + right_start-start) - break; - - flush_packet(f); - if (f->eof) - return error(f, VORBIS_seek_failed); - - frame_start += right_start - start; - - ++frame; - } - - // ok, at this point, the sample we want is contained in frame #'frame' - - // to decode frame #'frame' normally, we have to decode the - // previous frame first... but if it's the FIRST frame of the page - // we can't. if it's the first frame, it means it falls in the part - // of the first frame that doesn't overlap either of the other frames. - // so, if we have to handle that case for the first frame, we might - // as well handle it for all of them, so: - if (target_sample > frame_start + (left_end - left_start)) { - // so what we want to do is go ahead and just immediately decode - // this frame, but then make it so the next get_frame_float() uses - // this already-decoded data? or do we want to go ahead and rewind, - // and leave a flag saying to skip the first N data? let's do that - frames_to_skip = frame; // if this is frame #1, skip 1 frame (#0) - data_to_skip = left_end - left_start; - } else { - // otherwise, we want to skip frames 0, 1, 2, ... frame-2 - // (which means frame-2+1 total frames) then decode frame-1, - // then leave frame pending - frames_to_skip = frame - 1; - assert(frames_to_skip >= 0); - data_to_skip = -1; - } - - set_file_offset(f, page_start); - f->next_seg = - 1; // force page resync - - for (i=0; i < frames_to_skip; ++i) { - maybe_start_packet(f); - flush_packet(f); - } - - if (data_to_skip >= 0) { - int i,j,n = f->blocksize_0 >> 1; - f->discard_samples_deferred = data_to_skip; - for (i=0; i < f->channels; ++i) - for (j=0; j < n; ++j) - f->previous_window[i][j] = 0; - f->previous_length = n; - frame_start += data_to_skip; - } else { - f->previous_length = 0; - vorbis_pump_first_frame(f); - } - - // at this point, the NEXT decoded frame will generate the desired sample - if (fine) { - // so if we're doing sample accurate streaming, we want to go ahead and decode it! - if (target_sample != frame_start) { - int n; - stb_vorbis_get_frame_float(f, &n, NULL); - assert(target_sample > frame_start); - assert(f->channel_buffer_start + (int) (target_sample-frame_start) < f->channel_buffer_end); - f->channel_buffer_start += (target_sample - frame_start); - } - } - - return 0; -} - -static int vorbis_seek_base(stb_vorbis *f, unsigned int sample_number, int fine) -{ - ProbedPage p[2],q; - if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing); - - // do we know the location of the last page? - if (f->p_last.page_start == 0) { - uint32 z = stb_vorbis_stream_length_in_samples(f); - if (z == 0) return error(f, VORBIS_cant_find_last_page); - } - - p[0] = f->p_first; - p[1] = f->p_last; - - if (sample_number >= f->p_last.last_decoded_sample) - sample_number = f->p_last.last_decoded_sample-1; - - if (sample_number < f->p_first.last_decoded_sample) { - vorbis_seek_frame_from_page(f, p[0].page_start, 0, sample_number, fine); - return 0; - } else { - int attempts=0; - while (p[0].page_end < p[1].page_start) { - uint32 probe; - uint32 start_offset, end_offset; - uint32 start_sample, end_sample; - - // copy these into local variables so we can tweak them - // if any are unknown - start_offset = p[0].page_end; - end_offset = p[1].after_previous_page_start; // an address known to seek to page p[1] - start_sample = p[0].last_decoded_sample; - end_sample = p[1].last_decoded_sample; - - // currently there is no such tweaking logic needed/possible? - if (start_sample == SAMPLE_unknown || end_sample == SAMPLE_unknown) - return error(f, VORBIS_seek_failed); - - // now we want to lerp between these for the target samples... - - // step 1: we need to bias towards the page start... - if (start_offset + 4000 < end_offset) - end_offset -= 4000; - - // now compute an interpolated search loc - probe = start_offset + (int) floor((float) (end_offset - start_offset) / (end_sample - start_sample) * (sample_number - start_sample)); - - // next we need to bias towards binary search... - // code is a little wonky to allow for full 32-bit unsigned values - if (attempts >= 4) { - uint32 probe2 = start_offset + ((end_offset - start_offset) >> 1); - if (attempts >= 8) - probe = probe2; - else if (probe < probe2) - probe = probe + ((probe2 - probe) >> 1); - else - probe = probe2 + ((probe - probe2) >> 1); - } - ++attempts; - - set_file_offset(f, probe); - if (!vorbis_find_page(f, NULL, NULL)) return error(f, VORBIS_seek_failed); - if (!vorbis_analyze_page(f, &q)) return error(f, VORBIS_seek_failed); - q.after_previous_page_start = probe; - - // it's possible we've just found the last page again - if (q.page_start == p[1].page_start) { - p[1] = q; - continue; - } - - if (sample_number < q.last_decoded_sample) - p[1] = q; - else - p[0] = q; - } - - if (p[0].last_decoded_sample <= sample_number && sample_number < p[1].last_decoded_sample) { - vorbis_seek_frame_from_page(f, p[1].page_start, p[0].last_decoded_sample, sample_number, fine); - return 0; - } - return error(f, VORBIS_seek_failed); - } -} - -int stb_vorbis_seek_frame(stb_vorbis *f, unsigned int sample_number) -{ - return vorbis_seek_base(f, sample_number, FALSE); -} - -int stb_vorbis_seek(stb_vorbis *f, unsigned int sample_number) -{ - return vorbis_seek_base(f, sample_number, TRUE); -} - -void stb_vorbis_seek_start(stb_vorbis *f) -{ - if (IS_PUSH_MODE(f)) { error(f, VORBIS_invalid_api_mixing); return; } - set_file_offset(f, f->first_audio_page_offset); - f->previous_length = 0; - f->first_decode = TRUE; - f->next_seg = -1; - vorbis_pump_first_frame(f); -} - -unsigned int stb_vorbis_stream_length_in_samples(stb_vorbis *f) -{ - unsigned int restore_offset, previous_safe; - unsigned int end, last_page_loc; - - if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing); - if (!f->total_samples) { - int last; - uint32 lo,hi; - char header[6]; - - // first, store the current decode position so we can restore it - restore_offset = stb_vorbis_get_file_offset(f); - - // now we want to seek back 64K from the end (the last page must - // be at most a little less than 64K, but let's allow a little slop) - if (f->stream_len >= 65536 && f->stream_len-65536 >= f->first_audio_page_offset) - previous_safe = f->stream_len - 65536; - else - previous_safe = f->first_audio_page_offset; - - set_file_offset(f, previous_safe); - // previous_safe is now our candidate 'earliest known place that seeking - // to will lead to the final page' - - if (!vorbis_find_page(f, &end, (int unsigned *)&last)) { - // if we can't find a page, we're hosed! - f->error = VORBIS_cant_find_last_page; - f->total_samples = 0xffffffff; - goto done; - } - - // check if there are more pages - last_page_loc = stb_vorbis_get_file_offset(f); - - // stop when the last_page flag is set, not when we reach eof; - // this allows us to stop short of a 'file_section' end without - // explicitly checking the length of the section - while (!last) { - set_file_offset(f, end); - if (!vorbis_find_page(f, &end, (int unsigned *)&last)) { - // the last page we found didn't have the 'last page' flag - // set. whoops! - break; - } - previous_safe = last_page_loc+1; - last_page_loc = stb_vorbis_get_file_offset(f); - } - - set_file_offset(f, last_page_loc); - - // parse the header - getn(f, (unsigned char *)header, 6); - // extract the absolute granule position - lo = get32(f); - hi = get32(f); - if (lo == 0xffffffff && hi == 0xffffffff) { - f->error = VORBIS_cant_find_last_page; - f->total_samples = SAMPLE_unknown; - goto done; - } - if (hi) - lo = 0xfffffffe; // saturate - f->total_samples = lo; - - f->p_last.page_start = last_page_loc; - f->p_last.page_end = end; - f->p_last.last_decoded_sample = lo; - f->p_last.first_decoded_sample = SAMPLE_unknown; - f->p_last.after_previous_page_start = previous_safe; - - done: - set_file_offset(f, restore_offset); - } - return f->total_samples == SAMPLE_unknown ? 0 : f->total_samples; -} - -float stb_vorbis_stream_length_in_seconds(stb_vorbis *f) -{ - return stb_vorbis_stream_length_in_samples(f) / (float) f->sample_rate; -} - - - -int stb_vorbis_get_frame_float(stb_vorbis *f, int *channels, float ***output) -{ - int len, right,left,i; - if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing); - - if (!vorbis_decode_packet(f, &len, &left, &right)) { - f->channel_buffer_start = f->channel_buffer_end = 0; - return 0; - } - - len = vorbis_finish_frame(f, len, left, right); - for (i=0; i < f->channels; ++i) - f->outputs[i] = f->channel_buffers[i] + left; - - f->channel_buffer_start = left; - f->channel_buffer_end = left+len; - - if (channels) *channels = f->channels; - if (output) *output = f->outputs; - return len; -} - -#ifndef STB_VORBIS_NO_STDIO - -stb_vorbis * stb_vorbis_open_file_section(FILE *file, int close_on_free, int *error, stb_vorbis_alloc *alloc, unsigned int length) -{ - stb_vorbis *f, p; - vorbis_init(&p, alloc); - p.f = file; - p.f_start = ftell(file); - p.stream_len = length; - p.close_on_free = close_on_free; - if (start_decoder(&p)) { - f = vorbis_alloc(&p); - if (f) { - *f = p; - vorbis_pump_first_frame(f); - return f; - } - } - if (error) *error = p.error; - vorbis_deinit(&p); - return NULL; -} - -stb_vorbis * stb_vorbis_open_file(FILE *file, int close_on_free, int *error, stb_vorbis_alloc *alloc) -{ - unsigned int len, start; - start = ftell(file); - fseek(file, 0, SEEK_END); - len = ftell(file) - start; - fseek(file, start, SEEK_SET); - return stb_vorbis_open_file_section(file, close_on_free, error, alloc, len); -} - -stb_vorbis * stb_vorbis_open_filename(char *filename, int *error, stb_vorbis_alloc *alloc) -{ - FILE *f = fopen(filename, "rb"); - if (f) - return stb_vorbis_open_file(f, TRUE, error, alloc); - if (error) *error = VORBIS_file_open_failure; - return NULL; -} -#endif // STB_VORBIS_NO_STDIO - -stb_vorbis * stb_vorbis_open_memory(unsigned char *data, int len, int *error, stb_vorbis_alloc *alloc) -{ - stb_vorbis *f, p; - if (data == NULL) return NULL; - vorbis_init(&p, alloc); - p.stream = data; - p.stream_end = data + len; - p.stream_start = p.stream; - p.stream_len = len; - p.push_mode = FALSE; - if (start_decoder(&p)) { - f = vorbis_alloc(&p); - if (f) { - *f = p; - vorbis_pump_first_frame(f); - return f; - } - } - if (error) *error = p.error; - vorbis_deinit(&p); - return NULL; -} - -#ifndef STB_VORBIS_NO_INTEGER_CONVERSION -#define PLAYBACK_MONO 1 -#define PLAYBACK_LEFT 2 -#define PLAYBACK_RIGHT 4 - -#define L (PLAYBACK_LEFT | PLAYBACK_MONO) -#define C (PLAYBACK_LEFT | PLAYBACK_RIGHT | PLAYBACK_MONO) -#define R (PLAYBACK_RIGHT | PLAYBACK_MONO) - -static int8 channel_position[7][6] = -{ - { 0 }, - { C }, - { L, R }, - { L, C, R }, - { L, R, L, R }, - { L, C, R, L, R }, - { L, C, R, L, R, C }, -}; - - -#ifndef STB_VORBIS_NO_FAST_SCALED_FLOAT - typedef union { - float f; - int i; - } float_conv; - typedef char stb_vorbis_float_size_test[sizeof(float)==4 && sizeof(int) == 4]; - #define FASTDEF(x) float_conv x - // add (1<<23) to convert to int, then divide by 2^SHIFT, then add 0.5/2^SHIFT to round - #define MAGIC(SHIFT) (1.5f * (1 << (23-SHIFT)) + 0.5f/(1 << SHIFT)) - #define ADDEND(SHIFT) (((150-SHIFT) << 23) + (1 << 22)) - #define FAST_SCALED_FLOAT_TO_INT(temp,x,s) (temp.f = (x) + MAGIC(s), temp.i - ADDEND(s)) - #define check_endianness() -#else - #define FAST_SCALED_FLOAT_TO_INT(temp,x,s) ((int) ((x) * (1 << (s)))) - #define check_endianness() - #define FASTDEF(x) -#endif - -static void copy_samples(short *dest, float *src, int len) -{ - int i; - check_endianness(); - for (i=0; i < len; ++i) { - FASTDEF(temp); - int v = FAST_SCALED_FLOAT_TO_INT(temp, src[i],15); - if ((unsigned int) (v + 32768) > 65535) - v = v < 0 ? -32768 : 32767; - dest[i] = v; - } -} - -static void compute_samples(int mask, short *output, int num_c, float **data, int d_offset, int len) -{ - #define BUFFER_SIZE 32 - float buffer[BUFFER_SIZE]; - int i,j,o,n = BUFFER_SIZE; - check_endianness(); - for (o = 0; o < len; o += BUFFER_SIZE) { - memset(buffer, 0, sizeof(buffer)); - if (o + n > len) n = len - o; - for (j=0; j < num_c; ++j) { - if (channel_position[num_c][j] & mask) { - for (i=0; i < n; ++i) - buffer[i] += data[j][d_offset+o+i]; - } - } - for (i=0; i < n; ++i) { - FASTDEF(temp); - int v = FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15); - if ((unsigned int) (v + 32768) > 65535) - v = v < 0 ? -32768 : 32767; - output[o+i] = v; - } - } -} - -//static int channel_selector[3][2] = { {0}, {PLAYBACK_MONO}, {PLAYBACK_LEFT, PLAYBACK_RIGHT} }; -static void compute_stereo_samples(short *output, int num_c, float **data, int d_offset, int len) -{ - #define BUFFER_SIZE 32 - float buffer[BUFFER_SIZE]; - int i,j,o,n = BUFFER_SIZE >> 1; - // o is the offset in the source data - check_endianness(); - for (o = 0; o < len; o += BUFFER_SIZE >> 1) { - // o2 is the offset in the output data - int o2 = o << 1; - memset(buffer, 0, sizeof(buffer)); - if (o + n > len) n = len - o; - for (j=0; j < num_c; ++j) { - int m = channel_position[num_c][j] & (PLAYBACK_LEFT | PLAYBACK_RIGHT); - if (m == (PLAYBACK_LEFT | PLAYBACK_RIGHT)) { - for (i=0; i < n; ++i) { - buffer[i*2+0] += data[j][d_offset+o+i]; - buffer[i*2+1] += data[j][d_offset+o+i]; - } - } else if (m == PLAYBACK_LEFT) { - for (i=0; i < n; ++i) { - buffer[i*2+0] += data[j][d_offset+o+i]; - } - } else if (m == PLAYBACK_RIGHT) { - for (i=0; i < n; ++i) { - buffer[i*2+1] += data[j][d_offset+o+i]; - } - } - } - for (i=0; i < (n<<1); ++i) { - FASTDEF(temp); - int v = FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15); - if ((unsigned int) (v + 32768) > 65535) - v = v < 0 ? -32768 : 32767; - output[o2+i] = v; - } - } -} - -static void convert_samples_short(int buf_c, short **buffer, int b_offset, int data_c, float **data, int d_offset, int samples) -{ - int i; - if (buf_c != data_c && buf_c <= 2 && data_c <= 6) { - static int channel_selector[3][2] = { {0}, {PLAYBACK_MONO}, {PLAYBACK_LEFT, PLAYBACK_RIGHT} }; - for (i=0; i < buf_c; ++i) - compute_samples(channel_selector[buf_c][i], buffer[i]+b_offset, data_c, data, d_offset, samples); - } else { - int limit = buf_c < data_c ? buf_c : data_c; - for (i=0; i < limit; ++i) - copy_samples(buffer[i]+b_offset, data[i], samples); - for ( ; i < buf_c; ++i) - memset(buffer[i]+b_offset, 0, sizeof(short) * samples); - } -} - -int stb_vorbis_get_frame_short(stb_vorbis *f, int num_c, short **buffer, int num_samples) -{ - float **output; - int len = stb_vorbis_get_frame_float(f, NULL, &output); - if (len > num_samples) len = num_samples; - if (len) - convert_samples_short(num_c, buffer, 0, f->channels, output, 0, len); - return len; -} - -static void convert_channels_short_interleaved(int buf_c, short *buffer, int data_c, float **data, int d_offset, int len) -{ - int i; - check_endianness(); - if (buf_c != data_c && buf_c <= 2 && data_c <= 6) { - assert(buf_c == 2); - for (i=0; i < buf_c; ++i) - compute_stereo_samples(buffer, data_c, data, d_offset, len); - } else { - int limit = buf_c < data_c ? buf_c : data_c; - int j; - for (j=0; j < len; ++j) { - for (i=0; i < limit; ++i) { - FASTDEF(temp); - float f = data[i][d_offset+j]; - int v = FAST_SCALED_FLOAT_TO_INT(temp, f,15);//data[i][d_offset+j],15); - if ((unsigned int) (v + 32768) > 65535) - v = v < 0 ? -32768 : 32767; - *buffer++ = v; - } - for ( ; i < buf_c; ++i) - *buffer++ = 0; - } - } -} - -int stb_vorbis_get_frame_short_interleaved(stb_vorbis *f, int num_c, short *buffer, int num_shorts) -{ - float **output; - int len; - if (num_c == 1) return stb_vorbis_get_frame_short(f,num_c,&buffer, num_shorts); - len = stb_vorbis_get_frame_float(f, NULL, &output); - if (len) { - if (len*num_c > num_shorts) len = num_shorts / num_c; - convert_channels_short_interleaved(num_c, buffer, f->channels, output, 0, len); - } - return len; -} - -int stb_vorbis_get_samples_short_interleaved(stb_vorbis *f, int channels, short *buffer, int num_shorts) -{ - float **outputs; - int len = num_shorts / channels; - int n=0; - int z = f->channels; - if (z > channels) z = channels; - while (n < len) { - int k = f->channel_buffer_end - f->channel_buffer_start; - if (n+k >= len) k = len - n; - if (k) - convert_channels_short_interleaved(channels, buffer, f->channels, f->channel_buffers, f->channel_buffer_start, k); - buffer += k*channels; - n += k; - f->channel_buffer_start += k; - if (n == len) break; - if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break; - } - return n; -} - -int stb_vorbis_get_samples_short(stb_vorbis *f, int channels, short **buffer, int len) -{ - float **outputs; - int n=0; - int z = f->channels; - if (z > channels) z = channels; - while (n < len) { - int k = f->channel_buffer_end - f->channel_buffer_start; - if (n+k >= len) k = len - n; - if (k) - convert_samples_short(channels, buffer, n, f->channels, f->channel_buffers, f->channel_buffer_start, k); - n += k; - f->channel_buffer_start += k; - if (n == len) break; - if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break; - } - return n; -} - -#ifndef STB_VORBIS_NO_STDIO -int stb_vorbis_decode_filename(char *filename, int *channels, int* sample_rate, short **output) -{ - int data_len, offset, total, limit, error; - short *data; - stb_vorbis *v = stb_vorbis_open_filename(filename, &error, NULL); - if (v == NULL) return -1; - limit = v->channels * 4096; - *channels = v->channels; - *sample_rate = v->sample_rate; - offset = data_len = 0; - total = limit; - data = (short *) malloc(total * sizeof(*data)); - if (data == NULL) { - stb_vorbis_close(v); - return -2; - } - for (;;) { - int n = stb_vorbis_get_frame_short_interleaved(v, v->channels, data+offset, total-offset); - if (n == 0) break; - data_len += n; - offset += n * v->channels; - if (offset + limit > total) { - short *data2; - total *= 2; - data2 = (short *) realloc(data, total * sizeof(*data)); - if (data2 == NULL) { - free(data); - stb_vorbis_close(v); - return -2; - } - data = data2; - } - } - *output = data; - return data_len; -} -#endif // NO_STDIO - -int stb_vorbis_decode_memory(uint8 *mem, int len, int *channels, int* sample_rate, short **output) -{ - int data_len, offset, total, limit, error; - short *data; - stb_vorbis *v = stb_vorbis_open_memory(mem, len, &error, NULL); - if (v == NULL) return -1; - limit = v->channels * 4096; - *channels = v->channels; - *sample_rate = v->sample_rate; - offset = data_len = 0; - total = limit; - data = (short *) malloc(total * sizeof(*data)); - if (data == NULL) { - stb_vorbis_close(v); - return -2; - } - for (;;) { - int n = stb_vorbis_get_frame_short_interleaved(v, v->channels, data+offset, total-offset); - if (n == 0) break; - data_len += n; - offset += n * v->channels; - if (offset + limit > total) { - short *data2; - total *= 2; - data2 = (short *) realloc(data, total * sizeof(*data)); - if (data2 == NULL) { - free(data); - stb_vorbis_close(v); - return -2; - } - data = data2; - } - } - *output = data; - return data_len; -} -#endif - -int stb_vorbis_get_samples_float_interleaved(stb_vorbis *f, int channels, float *buffer, int num_floats) -{ - float **outputs; - int len = num_floats / channels; - int n=0; - int z = f->channels; - if (z > channels) z = channels; - while (n < len) { - int i,j; - int k = f->channel_buffer_end - f->channel_buffer_start; - if (n+k >= len) k = len - n; - for (j=0; j < k; ++j) { - for (i=0; i < z; ++i) - *buffer++ = f->channel_buffers[i][f->channel_buffer_start+j]; - for ( ; i < channels; ++i) - *buffer++ = 0; - } - n += k; - f->channel_buffer_start += k; - if (n == len) break; - if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break; - } - return n; -} - -int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, int num_samples) -{ - float **outputs; - int n=0; - int z = f->channels; - if (z > channels) z = channels; - while (n < num_samples) { - int i; - int k = f->channel_buffer_end - f->channel_buffer_start; - if (n+k >= num_samples) k = num_samples - n; - if (k) { - for (i=0; i < z; ++i) - memcpy(buffer[i]+n, f->channel_buffers+f->channel_buffer_start, sizeof(float)*k); - for ( ; i < channels; ++i) - memset(buffer[i]+n, 0, sizeof(float) * k); - } - n += k; - f->channel_buffer_start += k; - if (n == num_samples) break; - if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break; - } - return n; -} -#endif // STB_VORBIS_NO_PULLDATA_API - -#endif // STB_VORBIS_HEADER_ONLY +// Ogg Vorbis audio decoder - v1.14 - public domain+// http://nothings.org/stb_vorbis/+//+// Original version written by Sean Barrett in 2007.+//+// Originally sponsored by RAD Game Tools. Seeking implementation+// sponsored by Phillip Bennefall, Marc Andersen, Aaron Baker,+// Elias Software, Aras Pranckevicius, and Sean Barrett.+//+// LICENSE+//+// See end of file for license information.+//+// Limitations:+//+// - floor 0 not supported (used in old ogg vorbis files pre-2004)+// - lossless sample-truncation at beginning ignored+// - cannot concatenate multiple vorbis streams+// - sample positions are 32-bit, limiting seekable 192Khz+// files to around 6 hours (Ogg supports 64-bit)+//+// Feature contributors:+// Dougall Johnson (sample-exact seeking)+//+// Bugfix/warning contributors:+// Terje Mathisen Niklas Frykholm Andy Hill+// Casey Muratori John Bolton Gargaj+// Laurent Gomila Marc LeBlanc Ronny Chevalier+// Bernhard Wodo Evan Balster alxprd@github+// Tom Beaumont Ingo Leitgeb Nicolas Guillemot+// Phillip Bennefall Rohit Thiago Goulart+// manxorist@github saga musix github:infatum+// Timur Gagiev+//+// Partial history:+// 1.14 - 2018-02-11 - delete bogus dealloca usage+// 1.13 - 2018-01-29 - fix truncation of last frame (hopefully)+// 1.12 - 2017-11-21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files+// 1.11 - 2017-07-23 - fix MinGW compilation +// 1.10 - 2017-03-03 - more robust seeking; fix negative ilog(); clear error in open_memory+// 1.09 - 2016-04-04 - back out 'truncation of last frame' fix from previous version+// 1.08 - 2016-04-02 - warnings; setup memory leaks; truncation of last frame+// 1.07 - 2015-01-16 - fixes for crashes on invalid files; warning fixes; const+// 1.06 - 2015-08-31 - full, correct support for seeking API (Dougall Johnson)+// some crash fixes when out of memory or with corrupt files+// fix some inappropriately signed shifts+// 1.05 - 2015-04-19 - don't define __forceinline if it's redundant+// 1.04 - 2014-08-27 - fix missing const-correct case in API+// 1.03 - 2014-08-07 - warning fixes+// 1.02 - 2014-07-09 - declare qsort comparison as explicitly _cdecl in Windows+// 1.01 - 2014-06-18 - fix stb_vorbis_get_samples_float (interleaved was correct)+// 1.0 - 2014-05-26 - fix memory leaks; fix warnings; fix bugs in >2-channel;+// (API change) report sample rate for decode-full-file funcs+//+// See end of file for full version history.+++//////////////////////////////////////////////////////////////////////////////+//+// HEADER BEGINS HERE+//++#ifndef STB_VORBIS_INCLUDE_STB_VORBIS_H+#define STB_VORBIS_INCLUDE_STB_VORBIS_H++#if defined(STB_VORBIS_NO_CRT) && !defined(STB_VORBIS_NO_STDIO)+#define STB_VORBIS_NO_STDIO 1+#endif++#ifndef STB_VORBIS_NO_STDIO+#include <stdio.h>+#endif++#ifdef __cplusplus+extern "C" {+#endif++/////////// THREAD SAFETY++// Individual stb_vorbis* handles are not thread-safe; you cannot decode from+// them from multiple threads at the same time. However, you can have multiple+// stb_vorbis* handles and decode from them independently in multiple thrads.+++/////////// MEMORY ALLOCATION++// normally stb_vorbis uses malloc() to allocate memory at startup,+// and alloca() to allocate temporary memory during a frame on the+// stack. (Memory consumption will depend on the amount of setup+// data in the file and how you set the compile flags for speed+// vs. size. In my test files the maximal-size usage is ~150KB.)+//+// You can modify the wrapper functions in the source (setup_malloc,+// setup_temp_malloc, temp_malloc) to change this behavior, or you+// can use a simpler allocation model: you pass in a buffer from+// which stb_vorbis will allocate _all_ its memory (including the+// temp memory). "open" may fail with a VORBIS_outofmem if you+// do not pass in enough data; there is no way to determine how+// much you do need except to succeed (at which point you can+// query get_info to find the exact amount required. yes I know+// this is lame).+//+// If you pass in a non-NULL buffer of the type below, allocation+// will occur from it as described above. Otherwise just pass NULL+// to use malloc()/alloca()++typedef struct+{+ char *alloc_buffer;+ int alloc_buffer_length_in_bytes;+} stb_vorbis_alloc;+++/////////// FUNCTIONS USEABLE WITH ALL INPUT MODES++typedef struct stb_vorbis stb_vorbis;++typedef struct+{+ unsigned int sample_rate;+ int channels;++ unsigned int setup_memory_required;+ unsigned int setup_temp_memory_required;+ unsigned int temp_memory_required;++ int max_frame_size;+} stb_vorbis_info;++// get general information about the file+extern stb_vorbis_info stb_vorbis_get_info(stb_vorbis *f);++// get the last error detected (clears it, too)+extern int stb_vorbis_get_error(stb_vorbis *f);++// close an ogg vorbis file and free all memory in use+extern void stb_vorbis_close(stb_vorbis *f);++// this function returns the offset (in samples) from the beginning of the+// file that will be returned by the next decode, if it is known, or -1+// otherwise. after a flush_pushdata() call, this may take a while before+// it becomes valid again.+// NOT WORKING YET after a seek with PULLDATA API+extern int stb_vorbis_get_sample_offset(stb_vorbis *f);++// returns the current seek point within the file, or offset from the beginning+// of the memory buffer. In pushdata mode it returns 0.+extern unsigned int stb_vorbis_get_file_offset(stb_vorbis *f);++/////////// PUSHDATA API++#ifndef STB_VORBIS_NO_PUSHDATA_API++// this API allows you to get blocks of data from any source and hand+// them to stb_vorbis. you have to buffer them; stb_vorbis will tell+// you how much it used, and you have to give it the rest next time;+// and stb_vorbis may not have enough data to work with and you will+// need to give it the same data again PLUS more. Note that the Vorbis+// specification does not bound the size of an individual frame.++extern stb_vorbis *stb_vorbis_open_pushdata(+ const unsigned char * datablock, int datablock_length_in_bytes,+ int *datablock_memory_consumed_in_bytes,+ int *error,+ const stb_vorbis_alloc *alloc_buffer);+// create a vorbis decoder by passing in the initial data block containing+// the ogg&vorbis headers (you don't need to do parse them, just provide+// the first N bytes of the file--you're told if it's not enough, see below)+// on success, returns an stb_vorbis *, does not set error, returns the amount of+// data parsed/consumed on this call in *datablock_memory_consumed_in_bytes;+// on failure, returns NULL on error and sets *error, does not change *datablock_memory_consumed+// if returns NULL and *error is VORBIS_need_more_data, then the input block was+// incomplete and you need to pass in a larger block from the start of the file++extern int stb_vorbis_decode_frame_pushdata(+ stb_vorbis *f,+ const unsigned char *datablock, int datablock_length_in_bytes,+ int *channels, // place to write number of float * buffers+ float ***output, // place to write float ** array of float * buffers+ int *samples // place to write number of output samples+ );+// decode a frame of audio sample data if possible from the passed-in data block+//+// return value: number of bytes we used from datablock+//+// possible cases:+// 0 bytes used, 0 samples output (need more data)+// N bytes used, 0 samples output (resynching the stream, keep going)+// N bytes used, M samples output (one frame of data)+// note that after opening a file, you will ALWAYS get one N-bytes,0-sample+// frame, because Vorbis always "discards" the first frame.+//+// Note that on resynch, stb_vorbis will rarely consume all of the buffer,+// instead only datablock_length_in_bytes-3 or less. This is because it wants+// to avoid missing parts of a page header if they cross a datablock boundary,+// without writing state-machiney code to record a partial detection.+//+// The number of channels returned are stored in *channels (which can be+// NULL--it is always the same as the number of channels reported by+// get_info). *output will contain an array of float* buffers, one per+// channel. In other words, (*output)[0][0] contains the first sample from+// the first channel, and (*output)[1][0] contains the first sample from+// the second channel.++extern void stb_vorbis_flush_pushdata(stb_vorbis *f);+// inform stb_vorbis that your next datablock will not be contiguous with+// previous ones (e.g. you've seeked in the data); future attempts to decode+// frames will cause stb_vorbis to resynchronize (as noted above), and+// once it sees a valid Ogg page (typically 4-8KB, as large as 64KB), it+// will begin decoding the _next_ frame.+//+// if you want to seek using pushdata, you need to seek in your file, then+// call stb_vorbis_flush_pushdata(), then start calling decoding, then once+// decoding is returning you data, call stb_vorbis_get_sample_offset, and+// if you don't like the result, seek your file again and repeat.+#endif+++////////// PULLING INPUT API++#ifndef STB_VORBIS_NO_PULLDATA_API+// This API assumes stb_vorbis is allowed to pull data from a source--+// either a block of memory containing the _entire_ vorbis stream, or a+// FILE * that you or it create, or possibly some other reading mechanism+// if you go modify the source to replace the FILE * case with some kind+// of callback to your code. (But if you don't support seeking, you may+// just want to go ahead and use pushdata.)++#if !defined(STB_VORBIS_NO_STDIO) && !defined(STB_VORBIS_NO_INTEGER_CONVERSION)+extern int stb_vorbis_decode_filename(const char *filename, int *channels, int *sample_rate, short **output);+#endif+#if !defined(STB_VORBIS_NO_INTEGER_CONVERSION)+extern int stb_vorbis_decode_memory(const unsigned char *mem, int len, int *channels, int *sample_rate, short **output);+#endif+// decode an entire file and output the data interleaved into a malloc()ed+// buffer stored in *output. The return value is the number of samples+// decoded, or -1 if the file could not be opened or was not an ogg vorbis file.+// When you're done with it, just free() the pointer returned in *output.++extern stb_vorbis * stb_vorbis_open_memory(const unsigned char *data, int len,+ int *error, const stb_vorbis_alloc *alloc_buffer);+// create an ogg vorbis decoder from an ogg vorbis stream in memory (note+// this must be the entire stream!). on failure, returns NULL and sets *error++#ifndef STB_VORBIS_NO_STDIO+extern stb_vorbis * stb_vorbis_open_filename(const char *filename,+ int *error, const stb_vorbis_alloc *alloc_buffer);+// create an ogg vorbis decoder from a filename via fopen(). on failure,+// returns NULL and sets *error (possibly to VORBIS_file_open_failure).++extern stb_vorbis * stb_vorbis_open_file(FILE *f, int close_handle_on_close,+ int *error, const stb_vorbis_alloc *alloc_buffer);+// create an ogg vorbis decoder from an open FILE *, looking for a stream at+// the _current_ seek point (ftell). on failure, returns NULL and sets *error.+// note that stb_vorbis must "own" this stream; if you seek it in between+// calls to stb_vorbis, it will become confused. Morever, if you attempt to+// perform stb_vorbis_seek_*() operations on this file, it will assume it+// owns the _entire_ rest of the file after the start point. Use the next+// function, stb_vorbis_open_file_section(), to limit it.++extern stb_vorbis * stb_vorbis_open_file_section(FILE *f, int close_handle_on_close,+ int *error, const stb_vorbis_alloc *alloc_buffer, unsigned int len);+// create an ogg vorbis decoder from an open FILE *, looking for a stream at+// the _current_ seek point (ftell); the stream will be of length 'len' bytes.+// on failure, returns NULL and sets *error. note that stb_vorbis must "own"+// this stream; if you seek it in between calls to stb_vorbis, it will become+// confused.+#endif++extern int stb_vorbis_seek_frame(stb_vorbis *f, unsigned int sample_number);+extern int stb_vorbis_seek(stb_vorbis *f, unsigned int sample_number);+// these functions seek in the Vorbis file to (approximately) 'sample_number'.+// after calling seek_frame(), the next call to get_frame_*() will include+// the specified sample. after calling stb_vorbis_seek(), the next call to+// stb_vorbis_get_samples_* will start with the specified sample. If you+// do not need to seek to EXACTLY the target sample when using get_samples_*,+// you can also use seek_frame().++extern int stb_vorbis_seek_start(stb_vorbis *f);+// this function is equivalent to stb_vorbis_seek(f,0)++extern unsigned int stb_vorbis_stream_length_in_samples(stb_vorbis *f);+extern float stb_vorbis_stream_length_in_seconds(stb_vorbis *f);+// these functions return the total length of the vorbis stream++extern int stb_vorbis_get_frame_float(stb_vorbis *f, int *channels, float ***output);+// decode the next frame and return the number of samples. the number of+// channels returned are stored in *channels (which can be NULL--it is always+// the same as the number of channels reported by get_info). *output will+// contain an array of float* buffers, one per channel. These outputs will+// be overwritten on the next call to stb_vorbis_get_frame_*.+//+// You generally should not intermix calls to stb_vorbis_get_frame_*()+// and stb_vorbis_get_samples_*(), since the latter calls the former.++#ifndef STB_VORBIS_NO_INTEGER_CONVERSION+extern int stb_vorbis_get_frame_short_interleaved(stb_vorbis *f, int num_c, short *buffer, int num_shorts);+extern int stb_vorbis_get_frame_short (stb_vorbis *f, int num_c, short **buffer, int num_samples);+#endif+// decode the next frame and return the number of *samples* per channel.+// Note that for interleaved data, you pass in the number of shorts (the+// size of your array), but the return value is the number of samples per+// channel, not the total number of samples.+//+// The data is coerced to the number of channels you request according to the+// channel coercion rules (see below). You must pass in the size of your+// buffer(s) so that stb_vorbis will not overwrite the end of the buffer.+// The maximum buffer size needed can be gotten from get_info(); however,+// the Vorbis I specification implies an absolute maximum of 4096 samples+// per channel.++// Channel coercion rules:+// Let M be the number of channels requested, and N the number of channels present,+// and Cn be the nth channel; let stereo L be the sum of all L and center channels,+// and stereo R be the sum of all R and center channels (channel assignment from the+// vorbis spec).+// M N output+// 1 k sum(Ck) for all k+// 2 * stereo L, stereo R+// k l k > l, the first l channels, then 0s+// k l k <= l, the first k channels+// Note that this is not _good_ surround etc. mixing at all! It's just so+// you get something useful.++extern int stb_vorbis_get_samples_float_interleaved(stb_vorbis *f, int channels, float *buffer, int num_floats);+extern int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, int num_samples);+// gets num_samples samples, not necessarily on a frame boundary--this requires+// buffering so you have to supply the buffers. DOES NOT APPLY THE COERCION RULES.+// Returns the number of samples stored per channel; it may be less than requested+// at the end of the file. If there are no more samples in the file, returns 0.++#ifndef STB_VORBIS_NO_INTEGER_CONVERSION+extern int stb_vorbis_get_samples_short_interleaved(stb_vorbis *f, int channels, short *buffer, int num_shorts);+extern int stb_vorbis_get_samples_short(stb_vorbis *f, int channels, short **buffer, int num_samples);+#endif+// gets num_samples samples, not necessarily on a frame boundary--this requires+// buffering so you have to supply the buffers. Applies the coercion rules above+// to produce 'channels' channels. Returns the number of samples stored per channel;+// it may be less than requested at the end of the file. If there are no more+// samples in the file, returns 0.++#endif++//////// ERROR CODES++enum STBVorbisError+{+ VORBIS__no_error,++ VORBIS_need_more_data=1, // not a real error++ VORBIS_invalid_api_mixing, // can't mix API modes+ VORBIS_outofmem, // not enough memory+ VORBIS_feature_not_supported, // uses floor 0+ VORBIS_too_many_channels, // STB_VORBIS_MAX_CHANNELS is too small+ VORBIS_file_open_failure, // fopen() failed+ VORBIS_seek_without_length, // can't seek in unknown-length file++ VORBIS_unexpected_eof=10, // file is truncated?+ VORBIS_seek_invalid, // seek past EOF++ // decoding errors (corrupt/invalid stream) -- you probably+ // don't care about the exact details of these++ // vorbis errors:+ VORBIS_invalid_setup=20,+ VORBIS_invalid_stream,++ // ogg errors:+ VORBIS_missing_capture_pattern=30,+ VORBIS_invalid_stream_structure_version,+ VORBIS_continued_packet_flag_invalid,+ VORBIS_incorrect_stream_serial_number,+ VORBIS_invalid_first_page,+ VORBIS_bad_packet_type,+ VORBIS_cant_find_last_page,+ VORBIS_seek_failed+};+++#ifdef __cplusplus+}+#endif++#endif // STB_VORBIS_INCLUDE_STB_VORBIS_H+//+// HEADER ENDS HERE+//+//////////////////////////////////////////////////////////////////////////////++#ifndef STB_VORBIS_HEADER_ONLY++// global configuration settings (e.g. set these in the project/makefile),+// or just set them in this file at the top (although ideally the first few+// should be visible when the header file is compiled too, although it's not+// crucial)++// STB_VORBIS_NO_PUSHDATA_API+// does not compile the code for the various stb_vorbis_*_pushdata()+// functions+// #define STB_VORBIS_NO_PUSHDATA_API++// STB_VORBIS_NO_PULLDATA_API+// does not compile the code for the non-pushdata APIs+// #define STB_VORBIS_NO_PULLDATA_API++// STB_VORBIS_NO_STDIO+// does not compile the code for the APIs that use FILE *s internally+// or externally (implied by STB_VORBIS_NO_PULLDATA_API)+// #define STB_VORBIS_NO_STDIO++// STB_VORBIS_NO_INTEGER_CONVERSION+// does not compile the code for converting audio sample data from+// float to integer (implied by STB_VORBIS_NO_PULLDATA_API)+// #define STB_VORBIS_NO_INTEGER_CONVERSION++// STB_VORBIS_NO_FAST_SCALED_FLOAT+// does not use a fast float-to-int trick to accelerate float-to-int on+// most platforms which requires endianness be defined correctly.+//#define STB_VORBIS_NO_FAST_SCALED_FLOAT+++// STB_VORBIS_MAX_CHANNELS [number]+// globally define this to the maximum number of channels you need.+// The spec does not put a restriction on channels except that+// the count is stored in a byte, so 255 is the hard limit.+// Reducing this saves about 16 bytes per value, so using 16 saves+// (255-16)*16 or around 4KB. Plus anything other memory usage+// I forgot to account for. Can probably go as low as 8 (7.1 audio),+// 6 (5.1 audio), or 2 (stereo only).+#ifndef STB_VORBIS_MAX_CHANNELS+#define STB_VORBIS_MAX_CHANNELS 16 // enough for anyone?+#endif++// STB_VORBIS_PUSHDATA_CRC_COUNT [number]+// after a flush_pushdata(), stb_vorbis begins scanning for the+// next valid page, without backtracking. when it finds something+// that looks like a page, it streams through it and verifies its+// CRC32. Should that validation fail, it keeps scanning. But it's+// possible that _while_ streaming through to check the CRC32 of+// one candidate page, it sees another candidate page. This #define+// determines how many "overlapping" candidate pages it can search+// at once. Note that "real" pages are typically ~4KB to ~8KB, whereas+// garbage pages could be as big as 64KB, but probably average ~16KB.+// So don't hose ourselves by scanning an apparent 64KB page and+// missing a ton of real ones in the interim; so minimum of 2+#ifndef STB_VORBIS_PUSHDATA_CRC_COUNT+#define STB_VORBIS_PUSHDATA_CRC_COUNT 4+#endif++// STB_VORBIS_FAST_HUFFMAN_LENGTH [number]+// sets the log size of the huffman-acceleration table. Maximum+// supported value is 24. with larger numbers, more decodings are O(1),+// but the table size is larger so worse cache missing, so you'll have+// to probe (and try multiple ogg vorbis files) to find the sweet spot.+#ifndef STB_VORBIS_FAST_HUFFMAN_LENGTH+#define STB_VORBIS_FAST_HUFFMAN_LENGTH 10+#endif++// STB_VORBIS_FAST_BINARY_LENGTH [number]+// sets the log size of the binary-search acceleration table. this+// is used in similar fashion to the fast-huffman size to set initial+// parameters for the binary search++// STB_VORBIS_FAST_HUFFMAN_INT+// The fast huffman tables are much more efficient if they can be+// stored as 16-bit results instead of 32-bit results. This restricts+// the codebooks to having only 65535 possible outcomes, though.+// (At least, accelerated by the huffman table.)+#ifndef STB_VORBIS_FAST_HUFFMAN_INT+#define STB_VORBIS_FAST_HUFFMAN_SHORT+#endif++// STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH+// If the 'fast huffman' search doesn't succeed, then stb_vorbis falls+// back on binary searching for the correct one. This requires storing+// extra tables with the huffman codes in sorted order. Defining this+// symbol trades off space for speed by forcing a linear search in the+// non-fast case, except for "sparse" codebooks.+// #define STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH++// STB_VORBIS_DIVIDES_IN_RESIDUE+// stb_vorbis precomputes the result of the scalar residue decoding+// that would otherwise require a divide per chunk. you can trade off+// space for time by defining this symbol.+// #define STB_VORBIS_DIVIDES_IN_RESIDUE++// STB_VORBIS_DIVIDES_IN_CODEBOOK+// vorbis VQ codebooks can be encoded two ways: with every case explicitly+// stored, or with all elements being chosen from a small range of values,+// and all values possible in all elements. By default, stb_vorbis expands+// this latter kind out to look like the former kind for ease of decoding,+// because otherwise an integer divide-per-vector-element is required to+// unpack the index. If you define STB_VORBIS_DIVIDES_IN_CODEBOOK, you can+// trade off storage for speed.+//#define STB_VORBIS_DIVIDES_IN_CODEBOOK++#ifdef STB_VORBIS_CODEBOOK_SHORTS+#error "STB_VORBIS_CODEBOOK_SHORTS is no longer supported as it produced incorrect results for some input formats"+#endif++// STB_VORBIS_DIVIDE_TABLE+// this replaces small integer divides in the floor decode loop with+// table lookups. made less than 1% difference, so disabled by default.++// STB_VORBIS_NO_INLINE_DECODE+// disables the inlining of the scalar codebook fast-huffman decode.+// might save a little codespace; useful for debugging+// #define STB_VORBIS_NO_INLINE_DECODE++// STB_VORBIS_NO_DEFER_FLOOR+// Normally we only decode the floor without synthesizing the actual+// full curve. We can instead synthesize the curve immediately. This+// requires more memory and is very likely slower, so I don't think+// you'd ever want to do it except for debugging.+// #define STB_VORBIS_NO_DEFER_FLOOR+++++//////////////////////////////////////////////////////////////////////////////++#ifdef STB_VORBIS_NO_PULLDATA_API+ #define STB_VORBIS_NO_INTEGER_CONVERSION+ #define STB_VORBIS_NO_STDIO+#endif++#if defined(STB_VORBIS_NO_CRT) && !defined(STB_VORBIS_NO_STDIO)+ #define STB_VORBIS_NO_STDIO 1+#endif++#ifndef STB_VORBIS_NO_INTEGER_CONVERSION+#ifndef STB_VORBIS_NO_FAST_SCALED_FLOAT++ // only need endianness for fast-float-to-int, which we don't+ // use for pushdata++ #ifndef STB_VORBIS_BIG_ENDIAN+ #define STB_VORBIS_ENDIAN 0+ #else+ #define STB_VORBIS_ENDIAN 1+ #endif++#endif+#endif+++#ifndef STB_VORBIS_NO_STDIO+#include <stdio.h>+#endif++#ifndef STB_VORBIS_NO_CRT+ #include <stdlib.h>+ #include <string.h>+ #include <assert.h>+ #include <math.h>++ // find definition of alloca if it's not in stdlib.h:+ #if defined(_MSC_VER) || defined(__MINGW32__)+ #include <malloc.h>+ #endif+ #if defined(__linux__) || defined(__linux) || defined(__EMSCRIPTEN__)+ #include <alloca.h>+ #endif+#else // STB_VORBIS_NO_CRT+ #define NULL 0+ #define malloc(s) 0+ #define free(s) ((void) 0)+ #define realloc(s) 0+#endif // STB_VORBIS_NO_CRT++#include <limits.h>++#ifdef __MINGW32__+ // eff you mingw:+ // "fixed":+ // http://sourceforge.net/p/mingw-w64/mailman/message/32882927/+ // "no that broke the build, reverted, who cares about C":+ // http://sourceforge.net/p/mingw-w64/mailman/message/32890381/+ #ifdef __forceinline+ #undef __forceinline+ #endif+ #define __forceinline+ #define alloca __builtin_alloca+#elif !defined(_MSC_VER)+ #if __GNUC__+ #define __forceinline inline+ #else+ #define __forceinline+ #endif+#endif++#if STB_VORBIS_MAX_CHANNELS > 256+#error "Value of STB_VORBIS_MAX_CHANNELS outside of allowed range"+#endif++#if STB_VORBIS_FAST_HUFFMAN_LENGTH > 24+#error "Value of STB_VORBIS_FAST_HUFFMAN_LENGTH outside of allowed range"+#endif+++#if 0+#include <crtdbg.h>+#define CHECK(f) _CrtIsValidHeapPointer(f->channel_buffers[1])+#else+#define CHECK(f) ((void) 0)+#endif++#define MAX_BLOCKSIZE_LOG 13 // from specification+#define MAX_BLOCKSIZE (1 << MAX_BLOCKSIZE_LOG)+++typedef unsigned char uint8;+typedef signed char int8;+typedef unsigned short uint16;+typedef signed short int16;+typedef unsigned int uint32;+typedef signed int int32;++#ifndef TRUE+#define TRUE 1+#define FALSE 0+#endif++typedef float codetype;++// @NOTE+//+// Some arrays below are tagged "//varies", which means it's actually+// a variable-sized piece of data, but rather than malloc I assume it's+// small enough it's better to just allocate it all together with the+// main thing+//+// Most of the variables are specified with the smallest size I could pack+// them into. It might give better performance to make them all full-sized+// integers. It should be safe to freely rearrange the structures or change+// the sizes larger--nothing relies on silently truncating etc., nor the+// order of variables.++#define FAST_HUFFMAN_TABLE_SIZE (1 << STB_VORBIS_FAST_HUFFMAN_LENGTH)+#define FAST_HUFFMAN_TABLE_MASK (FAST_HUFFMAN_TABLE_SIZE - 1)++typedef struct+{+ int dimensions, entries;+ uint8 *codeword_lengths;+ float minimum_value;+ float delta_value;+ uint8 value_bits;+ uint8 lookup_type;+ uint8 sequence_p;+ uint8 sparse;+ uint32 lookup_values;+ codetype *multiplicands;+ uint32 *codewords;+ #ifdef STB_VORBIS_FAST_HUFFMAN_SHORT+ int16 fast_huffman[FAST_HUFFMAN_TABLE_SIZE];+ #else+ int32 fast_huffman[FAST_HUFFMAN_TABLE_SIZE];+ #endif+ uint32 *sorted_codewords;+ int *sorted_values;+ int sorted_entries;+} Codebook;++typedef struct+{+ uint8 order;+ uint16 rate;+ uint16 bark_map_size;+ uint8 amplitude_bits;+ uint8 amplitude_offset;+ uint8 number_of_books;+ uint8 book_list[16]; // varies+} Floor0;++typedef struct+{+ uint8 partitions;+ uint8 partition_class_list[32]; // varies+ uint8 class_dimensions[16]; // varies+ uint8 class_subclasses[16]; // varies+ uint8 class_masterbooks[16]; // varies+ int16 subclass_books[16][8]; // varies+ uint16 Xlist[31*8+2]; // varies+ uint8 sorted_order[31*8+2];+ uint8 neighbors[31*8+2][2];+ uint8 floor1_multiplier;+ uint8 rangebits;+ int values;+} Floor1;++typedef union+{+ Floor0 floor0;+ Floor1 floor1;+} Floor;++typedef struct+{+ uint32 begin, end;+ uint32 part_size;+ uint8 classifications;+ uint8 classbook;+ uint8 **classdata;+ int16 (*residue_books)[8];+} Residue;++typedef struct+{+ uint8 magnitude;+ uint8 angle;+ uint8 mux;+} MappingChannel;++typedef struct+{+ uint16 coupling_steps;+ MappingChannel *chan;+ uint8 submaps;+ uint8 submap_floor[15]; // varies+ uint8 submap_residue[15]; // varies+} Mapping;++typedef struct+{+ uint8 blockflag;+ uint8 mapping;+ uint16 windowtype;+ uint16 transformtype;+} Mode;++typedef struct+{+ uint32 goal_crc; // expected crc if match+ int bytes_left; // bytes left in packet+ uint32 crc_so_far; // running crc+ int bytes_done; // bytes processed in _current_ chunk+ uint32 sample_loc; // granule pos encoded in page+} CRCscan;++typedef struct+{+ uint32 page_start, page_end;+ uint32 last_decoded_sample;+} ProbedPage;++struct stb_vorbis+{+ // user-accessible info+ unsigned int sample_rate;+ int channels;++ unsigned int setup_memory_required;+ unsigned int temp_memory_required;+ unsigned int setup_temp_memory_required;++ // input config+#ifndef STB_VORBIS_NO_STDIO+ FILE *f;+ uint32 f_start;+ int close_on_free;+#endif++ uint8 *stream;+ uint8 *stream_start;+ uint8 *stream_end;++ uint32 stream_len;++ uint8 push_mode;++ uint32 first_audio_page_offset;++ ProbedPage p_first, p_last;++ // memory management+ stb_vorbis_alloc alloc;+ int setup_offset;+ int temp_offset;++ // run-time results+ int eof;+ enum STBVorbisError error;++ // user-useful data++ // header info+ int blocksize[2];+ int blocksize_0, blocksize_1;+ int codebook_count;+ Codebook *codebooks;+ int floor_count;+ uint16 floor_types[64]; // varies+ Floor *floor_config;+ int residue_count;+ uint16 residue_types[64]; // varies+ Residue *residue_config;+ int mapping_count;+ Mapping *mapping;+ int mode_count;+ Mode mode_config[64]; // varies++ uint32 total_samples;++ // decode buffer+ float *channel_buffers[STB_VORBIS_MAX_CHANNELS];+ float *outputs [STB_VORBIS_MAX_CHANNELS];++ float *previous_window[STB_VORBIS_MAX_CHANNELS];+ int previous_length;++ #ifndef STB_VORBIS_NO_DEFER_FLOOR+ int16 *finalY[STB_VORBIS_MAX_CHANNELS];+ #else+ float *floor_buffers[STB_VORBIS_MAX_CHANNELS];+ #endif++ uint32 current_loc; // sample location of next frame to decode+ int current_loc_valid;++ // per-blocksize precomputed data+ + // twiddle factors+ float *A[2],*B[2],*C[2];+ float *window[2];+ uint16 *bit_reverse[2];++ // current page/packet/segment streaming info+ uint32 serial; // stream serial number for verification+ int last_page;+ int segment_count;+ uint8 segments[255];+ uint8 page_flag;+ uint8 bytes_in_seg;+ uint8 first_decode;+ int next_seg;+ int last_seg; // flag that we're on the last segment+ int last_seg_which; // what was the segment number of the last seg?+ uint32 acc;+ int valid_bits;+ int packet_bytes;+ int end_seg_with_known_loc;+ uint32 known_loc_for_packet;+ int discard_samples_deferred;+ uint32 samples_output;++ // push mode scanning+ int page_crc_tests; // only in push_mode: number of tests active; -1 if not searching+#ifndef STB_VORBIS_NO_PUSHDATA_API+ CRCscan scan[STB_VORBIS_PUSHDATA_CRC_COUNT];+#endif++ // sample-access+ int channel_buffer_start;+ int channel_buffer_end;+};++#if defined(STB_VORBIS_NO_PUSHDATA_API)+ #define IS_PUSH_MODE(f) FALSE+#elif defined(STB_VORBIS_NO_PULLDATA_API)+ #define IS_PUSH_MODE(f) TRUE+#else+ #define IS_PUSH_MODE(f) ((f)->push_mode)+#endif++typedef struct stb_vorbis vorb;++static int error(vorb *f, enum STBVorbisError e)+{+ f->error = e;+ if (!f->eof && e != VORBIS_need_more_data) {+ f->error=e; // breakpoint for debugging+ }+ return 0;+}+++// these functions are used for allocating temporary memory+// while decoding. if you can afford the stack space, use+// alloca(); otherwise, provide a temp buffer and it will+// allocate out of those.++#define array_size_required(count,size) (count*(sizeof(void *)+(size)))++#define temp_alloc(f,size) (f->alloc.alloc_buffer ? setup_temp_malloc(f,size) : alloca(size))+#define temp_free(f,p) 0+#define temp_alloc_save(f) ((f)->temp_offset)+#define temp_alloc_restore(f,p) ((f)->temp_offset = (p))++#define temp_block_array(f,count,size) make_block_array(temp_alloc(f,array_size_required(count,size)), count, size)++// given a sufficiently large block of memory, make an array of pointers to subblocks of it+static void *make_block_array(void *mem, int count, int size)+{+ int i;+ void ** p = (void **) mem;+ char *q = (char *) (p + count);+ for (i=0; i < count; ++i) {+ p[i] = q;+ q += size;+ }+ return p;+}++static void *setup_malloc(vorb *f, int sz)+{+ sz = (sz+3) & ~3;+ f->setup_memory_required += sz;+ if (f->alloc.alloc_buffer) {+ void *p = (char *) f->alloc.alloc_buffer + f->setup_offset;+ if (f->setup_offset + sz > f->temp_offset) return NULL;+ f->setup_offset += sz;+ return p;+ }+ return sz ? malloc(sz) : NULL;+}++static void setup_free(vorb *f, void *p)+{+ if (f->alloc.alloc_buffer) return; // do nothing; setup mem is a stack+ free(p);+}++static void *setup_temp_malloc(vorb *f, int sz)+{+ sz = (sz+3) & ~3;+ if (f->alloc.alloc_buffer) {+ if (f->temp_offset - sz < f->setup_offset) return NULL;+ f->temp_offset -= sz;+ return (char *) f->alloc.alloc_buffer + f->temp_offset;+ }+ return malloc(sz);+}++static void setup_temp_free(vorb *f, void *p, int sz)+{+ if (f->alloc.alloc_buffer) {+ f->temp_offset += (sz+3)&~3;+ return;+ }+ free(p);+}++#define CRC32_POLY 0x04c11db7 // from spec++static uint32 crc_table[256];+static void crc32_init(void)+{+ int i,j;+ uint32 s;+ for(i=0; i < 256; i++) {+ for (s=(uint32) i << 24, j=0; j < 8; ++j)+ s = (s << 1) ^ (s >= (1U<<31) ? CRC32_POLY : 0);+ crc_table[i] = s;+ }+}++static __forceinline uint32 crc32_update(uint32 crc, uint8 byte)+{+ return (crc << 8) ^ crc_table[byte ^ (crc >> 24)];+}+++// used in setup, and for huffman that doesn't go fast path+static unsigned int bit_reverse(unsigned int n)+{+ n = ((n & 0xAAAAAAAA) >> 1) | ((n & 0x55555555) << 1);+ n = ((n & 0xCCCCCCCC) >> 2) | ((n & 0x33333333) << 2);+ n = ((n & 0xF0F0F0F0) >> 4) | ((n & 0x0F0F0F0F) << 4);+ n = ((n & 0xFF00FF00) >> 8) | ((n & 0x00FF00FF) << 8);+ return (n >> 16) | (n << 16);+}++static float square(float x)+{+ return x*x;+}++// this is a weird definition of log2() for which log2(1) = 1, log2(2) = 2, log2(4) = 3+// as required by the specification. fast(?) implementation from stb.h+// @OPTIMIZE: called multiple times per-packet with "constants"; move to setup+static int ilog(int32 n)+{+ static signed char log2_4[16] = { 0,1,2,2,3,3,3,3,4,4,4,4,4,4,4,4 };++ if (n < 0) return 0; // signed n returns 0++ // 2 compares if n < 16, 3 compares otherwise (4 if signed or n > 1<<29)+ if (n < (1 << 14))+ if (n < (1 << 4)) return 0 + log2_4[n ];+ else if (n < (1 << 9)) return 5 + log2_4[n >> 5];+ else return 10 + log2_4[n >> 10];+ else if (n < (1 << 24))+ if (n < (1 << 19)) return 15 + log2_4[n >> 15];+ else return 20 + log2_4[n >> 20];+ else if (n < (1 << 29)) return 25 + log2_4[n >> 25];+ else return 30 + log2_4[n >> 30];+}++#ifndef M_PI+ #define M_PI 3.14159265358979323846264f // from CRC+#endif++// code length assigned to a value with no huffman encoding+#define NO_CODE 255++/////////////////////// LEAF SETUP FUNCTIONS //////////////////////////+//+// these functions are only called at setup, and only a few times+// per file++static float float32_unpack(uint32 x)+{+ // from the specification+ uint32 mantissa = x & 0x1fffff;+ uint32 sign = x & 0x80000000;+ uint32 exp = (x & 0x7fe00000) >> 21;+ double res = sign ? -(double)mantissa : (double)mantissa;+ return (float) ldexp((float)res, exp-788);+}+++// zlib & jpeg huffman tables assume that the output symbols+// can either be arbitrarily arranged, or have monotonically+// increasing frequencies--they rely on the lengths being sorted;+// this makes for a very simple generation algorithm.+// vorbis allows a huffman table with non-sorted lengths. This+// requires a more sophisticated construction, since symbols in+// order do not map to huffman codes "in order".+static void add_entry(Codebook *c, uint32 huff_code, int symbol, int count, int len, uint32 *values)+{+ if (!c->sparse) {+ c->codewords [symbol] = huff_code;+ } else {+ c->codewords [count] = huff_code;+ c->codeword_lengths[count] = len;+ values [count] = symbol;+ }+}++static int compute_codewords(Codebook *c, uint8 *len, int n, uint32 *values)+{+ int i,k,m=0;+ uint32 available[32];++ memset(available, 0, sizeof(available));+ // find the first entry+ for (k=0; k < n; ++k) if (len[k] < NO_CODE) break;+ if (k == n) { assert(c->sorted_entries == 0); return TRUE; }+ // add to the list+ add_entry(c, 0, k, m++, len[k], values);+ // add all available leaves+ for (i=1; i <= len[k]; ++i)+ available[i] = 1U << (32-i);+ // note that the above code treats the first case specially,+ // but it's really the same as the following code, so they+ // could probably be combined (except the initial code is 0,+ // and I use 0 in available[] to mean 'empty')+ for (i=k+1; i < n; ++i) {+ uint32 res;+ int z = len[i], y;+ if (z == NO_CODE) continue;+ // find lowest available leaf (should always be earliest,+ // which is what the specification calls for)+ // note that this property, and the fact we can never have+ // more than one free leaf at a given level, isn't totally+ // trivial to prove, but it seems true and the assert never+ // fires, so!+ while (z > 0 && !available[z]) --z;+ if (z == 0) { return FALSE; }+ res = available[z];+ assert(z >= 0 && z < 32);+ available[z] = 0;+ add_entry(c, bit_reverse(res), i, m++, len[i], values);+ // propogate availability up the tree+ if (z != len[i]) {+ assert(len[i] >= 0 && len[i] < 32);+ for (y=len[i]; y > z; --y) {+ assert(available[y] == 0);+ available[y] = res + (1 << (32-y));+ }+ }+ }+ return TRUE;+}++// accelerated huffman table allows fast O(1) match of all symbols+// of length <= STB_VORBIS_FAST_HUFFMAN_LENGTH+static void compute_accelerated_huffman(Codebook *c)+{+ int i, len;+ for (i=0; i < FAST_HUFFMAN_TABLE_SIZE; ++i)+ c->fast_huffman[i] = -1;++ len = c->sparse ? c->sorted_entries : c->entries;+ #ifdef STB_VORBIS_FAST_HUFFMAN_SHORT+ if (len > 32767) len = 32767; // largest possible value we can encode!+ #endif+ for (i=0; i < len; ++i) {+ if (c->codeword_lengths[i] <= STB_VORBIS_FAST_HUFFMAN_LENGTH) {+ uint32 z = c->sparse ? bit_reverse(c->sorted_codewords[i]) : c->codewords[i];+ // set table entries for all bit combinations in the higher bits+ while (z < FAST_HUFFMAN_TABLE_SIZE) {+ c->fast_huffman[z] = i;+ z += 1 << c->codeword_lengths[i];+ }+ }+ }+}++#ifdef _MSC_VER+#define STBV_CDECL __cdecl+#else+#define STBV_CDECL+#endif++static int STBV_CDECL uint32_compare(const void *p, const void *q)+{+ uint32 x = * (uint32 *) p;+ uint32 y = * (uint32 *) q;+ return x < y ? -1 : x > y;+}++static int include_in_sort(Codebook *c, uint8 len)+{+ if (c->sparse) { assert(len != NO_CODE); return TRUE; }+ if (len == NO_CODE) return FALSE;+ if (len > STB_VORBIS_FAST_HUFFMAN_LENGTH) return TRUE;+ return FALSE;+}++// if the fast table above doesn't work, we want to binary+// search them... need to reverse the bits+static void compute_sorted_huffman(Codebook *c, uint8 *lengths, uint32 *values)+{+ int i, len;+ // build a list of all the entries+ // OPTIMIZATION: don't include the short ones, since they'll be caught by FAST_HUFFMAN.+ // this is kind of a frivolous optimization--I don't see any performance improvement,+ // but it's like 4 extra lines of code, so.+ if (!c->sparse) {+ int k = 0;+ for (i=0; i < c->entries; ++i)+ if (include_in_sort(c, lengths[i])) + c->sorted_codewords[k++] = bit_reverse(c->codewords[i]);+ assert(k == c->sorted_entries);+ } else {+ for (i=0; i < c->sorted_entries; ++i)+ c->sorted_codewords[i] = bit_reverse(c->codewords[i]);+ }++ qsort(c->sorted_codewords, c->sorted_entries, sizeof(c->sorted_codewords[0]), uint32_compare);+ c->sorted_codewords[c->sorted_entries] = 0xffffffff;++ len = c->sparse ? c->sorted_entries : c->entries;+ // now we need to indicate how they correspond; we could either+ // #1: sort a different data structure that says who they correspond to+ // #2: for each sorted entry, search the original list to find who corresponds+ // #3: for each original entry, find the sorted entry+ // #1 requires extra storage, #2 is slow, #3 can use binary search!+ for (i=0; i < len; ++i) {+ int huff_len = c->sparse ? lengths[values[i]] : lengths[i];+ if (include_in_sort(c,huff_len)) {+ uint32 code = bit_reverse(c->codewords[i]);+ int x=0, n=c->sorted_entries;+ while (n > 1) {+ // invariant: sc[x] <= code < sc[x+n]+ int m = x + (n >> 1);+ if (c->sorted_codewords[m] <= code) {+ x = m;+ n -= (n>>1);+ } else {+ n >>= 1;+ }+ }+ assert(c->sorted_codewords[x] == code);+ if (c->sparse) {+ c->sorted_values[x] = values[i];+ c->codeword_lengths[x] = huff_len;+ } else {+ c->sorted_values[x] = i;+ }+ }+ }+}++// only run while parsing the header (3 times)+static int vorbis_validate(uint8 *data)+{+ static uint8 vorbis[6] = { 'v', 'o', 'r', 'b', 'i', 's' };+ return memcmp(data, vorbis, 6) == 0;+}++// called from setup only, once per code book+// (formula implied by specification)+static int lookup1_values(int entries, int dim)+{+ int r = (int) floor(exp((float) log((float) entries) / dim));+ if ((int) floor(pow((float) r+1, dim)) <= entries) // (int) cast for MinGW warning;+ ++r; // floor() to avoid _ftol() when non-CRT+ assert(pow((float) r+1, dim) > entries);+ assert((int) floor(pow((float) r, dim)) <= entries); // (int),floor() as above+ return r;+}++// called twice per file+static void compute_twiddle_factors(int n, float *A, float *B, float *C)+{+ int n4 = n >> 2, n8 = n >> 3;+ int k,k2;++ for (k=k2=0; k < n4; ++k,k2+=2) {+ A[k2 ] = (float) cos(4*k*M_PI/n);+ A[k2+1] = (float) -sin(4*k*M_PI/n);+ B[k2 ] = (float) cos((k2+1)*M_PI/n/2) * 0.5f;+ B[k2+1] = (float) sin((k2+1)*M_PI/n/2) * 0.5f;+ }+ for (k=k2=0; k < n8; ++k,k2+=2) {+ C[k2 ] = (float) cos(2*(k2+1)*M_PI/n);+ C[k2+1] = (float) -sin(2*(k2+1)*M_PI/n);+ }+}++static void compute_window(int n, float *window)+{+ int n2 = n >> 1, i;+ for (i=0; i < n2; ++i)+ window[i] = (float) sin(0.5 * M_PI * square((float) sin((i - 0 + 0.5) / n2 * 0.5 * M_PI)));+}++static void compute_bitreverse(int n, uint16 *rev)+{+ int ld = ilog(n) - 1; // ilog is off-by-one from normal definitions+ int i, n8 = n >> 3;+ for (i=0; i < n8; ++i)+ rev[i] = (bit_reverse(i) >> (32-ld+3)) << 2;+}++static int init_blocksize(vorb *f, int b, int n)+{+ int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3;+ f->A[b] = (float *) setup_malloc(f, sizeof(float) * n2);+ f->B[b] = (float *) setup_malloc(f, sizeof(float) * n2);+ f->C[b] = (float *) setup_malloc(f, sizeof(float) * n4);+ if (!f->A[b] || !f->B[b] || !f->C[b]) return error(f, VORBIS_outofmem);+ compute_twiddle_factors(n, f->A[b], f->B[b], f->C[b]);+ f->window[b] = (float *) setup_malloc(f, sizeof(float) * n2);+ if (!f->window[b]) return error(f, VORBIS_outofmem);+ compute_window(n, f->window[b]);+ f->bit_reverse[b] = (uint16 *) setup_malloc(f, sizeof(uint16) * n8);+ if (!f->bit_reverse[b]) return error(f, VORBIS_outofmem);+ compute_bitreverse(n, f->bit_reverse[b]);+ return TRUE;+}++static void neighbors(uint16 *x, int n, int *plow, int *phigh)+{+ int low = -1;+ int high = 65536;+ int i;+ for (i=0; i < n; ++i) {+ if (x[i] > low && x[i] < x[n]) { *plow = i; low = x[i]; }+ if (x[i] < high && x[i] > x[n]) { *phigh = i; high = x[i]; }+ }+}++// this has been repurposed so y is now the original index instead of y+typedef struct+{+ uint16 x,id;+} stbv__floor_ordering;++static int STBV_CDECL point_compare(const void *p, const void *q)+{+ stbv__floor_ordering *a = (stbv__floor_ordering *) p;+ stbv__floor_ordering *b = (stbv__floor_ordering *) q;+ return a->x < b->x ? -1 : a->x > b->x;+}++//+/////////////////////// END LEAF SETUP FUNCTIONS //////////////////////////+++#if defined(STB_VORBIS_NO_STDIO)+ #define USE_MEMORY(z) TRUE+#else+ #define USE_MEMORY(z) ((z)->stream)+#endif++static uint8 get8(vorb *z)+{+ if (USE_MEMORY(z)) {+ if (z->stream >= z->stream_end) { z->eof = TRUE; return 0; }+ return *z->stream++;+ }++ #ifndef STB_VORBIS_NO_STDIO+ {+ int c = fgetc(z->f);+ if (c == EOF) { z->eof = TRUE; return 0; }+ return c;+ }+ #endif+}++static uint32 get32(vorb *f)+{+ uint32 x;+ x = get8(f);+ x += get8(f) << 8;+ x += get8(f) << 16;+ x += (uint32) get8(f) << 24;+ return x;+}++static int getn(vorb *z, uint8 *data, int n)+{+ if (USE_MEMORY(z)) {+ if (z->stream+n > z->stream_end) { z->eof = 1; return 0; }+ memcpy(data, z->stream, n);+ z->stream += n;+ return 1;+ }++ #ifndef STB_VORBIS_NO_STDIO + if (fread(data, n, 1, z->f) == 1)+ return 1;+ else {+ z->eof = 1;+ return 0;+ }+ #endif+}++static void skip(vorb *z, int n)+{+ if (USE_MEMORY(z)) {+ z->stream += n;+ if (z->stream >= z->stream_end) z->eof = 1;+ return;+ }+ #ifndef STB_VORBIS_NO_STDIO+ {+ long x = ftell(z->f);+ fseek(z->f, x+n, SEEK_SET);+ }+ #endif+}++static int set_file_offset(stb_vorbis *f, unsigned int loc)+{+ #ifndef STB_VORBIS_NO_PUSHDATA_API+ if (f->push_mode) return 0;+ #endif+ f->eof = 0;+ if (USE_MEMORY(f)) {+ if (f->stream_start + loc >= f->stream_end || f->stream_start + loc < f->stream_start) {+ f->stream = f->stream_end;+ f->eof = 1;+ return 0;+ } else {+ f->stream = f->stream_start + loc;+ return 1;+ }+ }+ #ifndef STB_VORBIS_NO_STDIO+ if (loc + f->f_start < loc || loc >= 0x80000000) {+ loc = 0x7fffffff;+ f->eof = 1;+ } else {+ loc += f->f_start;+ }+ if (!fseek(f->f, loc, SEEK_SET))+ return 1;+ f->eof = 1;+ fseek(f->f, f->f_start, SEEK_END);+ return 0;+ #endif+}+++static uint8 ogg_page_header[4] = { 0x4f, 0x67, 0x67, 0x53 };++static int capture_pattern(vorb *f)+{+ if (0x4f != get8(f)) return FALSE;+ if (0x67 != get8(f)) return FALSE;+ if (0x67 != get8(f)) return FALSE;+ if (0x53 != get8(f)) return FALSE;+ return TRUE;+}++#define PAGEFLAG_continued_packet 1+#define PAGEFLAG_first_page 2+#define PAGEFLAG_last_page 4++static int start_page_no_capturepattern(vorb *f)+{+ uint32 loc0,loc1,n;+ // stream structure version+ if (0 != get8(f)) return error(f, VORBIS_invalid_stream_structure_version);+ // header flag+ f->page_flag = get8(f);+ // absolute granule position+ loc0 = get32(f); + loc1 = get32(f);+ // @TODO: validate loc0,loc1 as valid positions?+ // stream serial number -- vorbis doesn't interleave, so discard+ get32(f);+ //if (f->serial != get32(f)) return error(f, VORBIS_incorrect_stream_serial_number);+ // page sequence number+ n = get32(f);+ f->last_page = n;+ // CRC32+ get32(f);+ // page_segments+ f->segment_count = get8(f);+ if (!getn(f, f->segments, f->segment_count))+ return error(f, VORBIS_unexpected_eof);+ // assume we _don't_ know any the sample position of any segments+ f->end_seg_with_known_loc = -2;+ if (loc0 != ~0U || loc1 != ~0U) {+ int i;+ // determine which packet is the last one that will complete+ for (i=f->segment_count-1; i >= 0; --i)+ if (f->segments[i] < 255)+ break;+ // 'i' is now the index of the _last_ segment of a packet that ends+ if (i >= 0) {+ f->end_seg_with_known_loc = i;+ f->known_loc_for_packet = loc0;+ }+ }+ if (f->first_decode) {+ int i,len;+ ProbedPage p;+ len = 0;+ for (i=0; i < f->segment_count; ++i)+ len += f->segments[i];+ len += 27 + f->segment_count;+ p.page_start = f->first_audio_page_offset;+ p.page_end = p.page_start + len;+ p.last_decoded_sample = loc0;+ f->p_first = p;+ }+ f->next_seg = 0;+ return TRUE;+}++static int start_page(vorb *f)+{+ if (!capture_pattern(f)) return error(f, VORBIS_missing_capture_pattern);+ return start_page_no_capturepattern(f);+}++static int start_packet(vorb *f)+{+ while (f->next_seg == -1) {+ if (!start_page(f)) return FALSE;+ if (f->page_flag & PAGEFLAG_continued_packet)+ return error(f, VORBIS_continued_packet_flag_invalid);+ }+ f->last_seg = FALSE;+ f->valid_bits = 0;+ f->packet_bytes = 0;+ f->bytes_in_seg = 0;+ // f->next_seg is now valid+ return TRUE;+}++static int maybe_start_packet(vorb *f)+{+ if (f->next_seg == -1) {+ int x = get8(f);+ if (f->eof) return FALSE; // EOF at page boundary is not an error!+ if (0x4f != x ) return error(f, VORBIS_missing_capture_pattern);+ if (0x67 != get8(f)) return error(f, VORBIS_missing_capture_pattern);+ if (0x67 != get8(f)) return error(f, VORBIS_missing_capture_pattern);+ if (0x53 != get8(f)) return error(f, VORBIS_missing_capture_pattern);+ if (!start_page_no_capturepattern(f)) return FALSE;+ if (f->page_flag & PAGEFLAG_continued_packet) {+ // set up enough state that we can read this packet if we want,+ // e.g. during recovery+ f->last_seg = FALSE;+ f->bytes_in_seg = 0;+ return error(f, VORBIS_continued_packet_flag_invalid);+ }+ }+ return start_packet(f);+}++static int next_segment(vorb *f)+{+ int len;+ if (f->last_seg) return 0;+ if (f->next_seg == -1) {+ f->last_seg_which = f->segment_count-1; // in case start_page fails+ if (!start_page(f)) { f->last_seg = 1; return 0; }+ if (!(f->page_flag & PAGEFLAG_continued_packet)) return error(f, VORBIS_continued_packet_flag_invalid);+ }+ len = f->segments[f->next_seg++];+ if (len < 255) {+ f->last_seg = TRUE;+ f->last_seg_which = f->next_seg-1;+ }+ if (f->next_seg >= f->segment_count)+ f->next_seg = -1;+ assert(f->bytes_in_seg == 0);+ f->bytes_in_seg = len;+ return len;+}++#define EOP (-1)+#define INVALID_BITS (-1)++static int get8_packet_raw(vorb *f)+{+ if (!f->bytes_in_seg) { // CLANG!+ if (f->last_seg) return EOP;+ else if (!next_segment(f)) return EOP;+ }+ assert(f->bytes_in_seg > 0);+ --f->bytes_in_seg;+ ++f->packet_bytes;+ return get8(f);+}++static int get8_packet(vorb *f)+{+ int x = get8_packet_raw(f);+ f->valid_bits = 0;+ return x;+}++static void flush_packet(vorb *f)+{+ while (get8_packet_raw(f) != EOP);+}++// @OPTIMIZE: this is the secondary bit decoder, so it's probably not as important+// as the huffman decoder?+static uint32 get_bits(vorb *f, int n)+{+ uint32 z;++ if (f->valid_bits < 0) return 0;+ if (f->valid_bits < n) {+ if (n > 24) {+ // the accumulator technique below would not work correctly in this case+ z = get_bits(f, 24);+ z += get_bits(f, n-24) << 24;+ return z;+ }+ if (f->valid_bits == 0) f->acc = 0;+ while (f->valid_bits < n) {+ int z = get8_packet_raw(f);+ if (z == EOP) {+ f->valid_bits = INVALID_BITS;+ return 0;+ }+ f->acc += z << f->valid_bits;+ f->valid_bits += 8;+ }+ }+ if (f->valid_bits < 0) return 0;+ z = f->acc & ((1 << n)-1);+ f->acc >>= n;+ f->valid_bits -= n;+ return z;+}++// @OPTIMIZE: primary accumulator for huffman+// expand the buffer to as many bits as possible without reading off end of packet+// it might be nice to allow f->valid_bits and f->acc to be stored in registers,+// e.g. cache them locally and decode locally+static __forceinline void prep_huffman(vorb *f)+{+ if (f->valid_bits <= 24) {+ if (f->valid_bits == 0) f->acc = 0;+ do {+ int z;+ if (f->last_seg && !f->bytes_in_seg) return;+ z = get8_packet_raw(f);+ if (z == EOP) return;+ f->acc += (unsigned) z << f->valid_bits;+ f->valid_bits += 8;+ } while (f->valid_bits <= 24);+ }+}++enum+{+ VORBIS_packet_id = 1,+ VORBIS_packet_comment = 3,+ VORBIS_packet_setup = 5+};++static int codebook_decode_scalar_raw(vorb *f, Codebook *c)+{+ int i;+ prep_huffman(f);++ if (c->codewords == NULL && c->sorted_codewords == NULL)+ return -1;++ // cases to use binary search: sorted_codewords && !c->codewords+ // sorted_codewords && c->entries > 8+ if (c->entries > 8 ? c->sorted_codewords!=NULL : !c->codewords) {+ // binary search+ uint32 code = bit_reverse(f->acc);+ int x=0, n=c->sorted_entries, len;++ while (n > 1) {+ // invariant: sc[x] <= code < sc[x+n]+ int m = x + (n >> 1);+ if (c->sorted_codewords[m] <= code) {+ x = m;+ n -= (n>>1);+ } else {+ n >>= 1;+ }+ }+ // x is now the sorted index+ if (!c->sparse) x = c->sorted_values[x];+ // x is now sorted index if sparse, or symbol otherwise+ len = c->codeword_lengths[x];+ if (f->valid_bits >= len) {+ f->acc >>= len;+ f->valid_bits -= len;+ return x;+ }++ f->valid_bits = 0;+ return -1;+ }++ // if small, linear search+ assert(!c->sparse);+ for (i=0; i < c->entries; ++i) {+ if (c->codeword_lengths[i] == NO_CODE) continue;+ if (c->codewords[i] == (f->acc & ((1 << c->codeword_lengths[i])-1))) {+ if (f->valid_bits >= c->codeword_lengths[i]) {+ f->acc >>= c->codeword_lengths[i];+ f->valid_bits -= c->codeword_lengths[i];+ return i;+ }+ f->valid_bits = 0;+ return -1;+ }+ }++ error(f, VORBIS_invalid_stream);+ f->valid_bits = 0;+ return -1;+}++#ifndef STB_VORBIS_NO_INLINE_DECODE++#define DECODE_RAW(var, f,c) \+ if (f->valid_bits < STB_VORBIS_FAST_HUFFMAN_LENGTH) \+ prep_huffman(f); \+ var = f->acc & FAST_HUFFMAN_TABLE_MASK; \+ var = c->fast_huffman[var]; \+ if (var >= 0) { \+ int n = c->codeword_lengths[var]; \+ f->acc >>= n; \+ f->valid_bits -= n; \+ if (f->valid_bits < 0) { f->valid_bits = 0; var = -1; } \+ } else { \+ var = codebook_decode_scalar_raw(f,c); \+ }++#else++static int codebook_decode_scalar(vorb *f, Codebook *c)+{+ int i;+ if (f->valid_bits < STB_VORBIS_FAST_HUFFMAN_LENGTH)+ prep_huffman(f);+ // fast huffman table lookup+ i = f->acc & FAST_HUFFMAN_TABLE_MASK;+ i = c->fast_huffman[i];+ if (i >= 0) {+ f->acc >>= c->codeword_lengths[i];+ f->valid_bits -= c->codeword_lengths[i];+ if (f->valid_bits < 0) { f->valid_bits = 0; return -1; }+ return i;+ }+ return codebook_decode_scalar_raw(f,c);+}++#define DECODE_RAW(var,f,c) var = codebook_decode_scalar(f,c);++#endif++#define DECODE(var,f,c) \+ DECODE_RAW(var,f,c) \+ if (c->sparse) var = c->sorted_values[var];++#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK+ #define DECODE_VQ(var,f,c) DECODE_RAW(var,f,c)+#else+ #define DECODE_VQ(var,f,c) DECODE(var,f,c)+#endif+++++++// CODEBOOK_ELEMENT_FAST is an optimization for the CODEBOOK_FLOATS case+// where we avoid one addition+#define CODEBOOK_ELEMENT(c,off) (c->multiplicands[off])+#define CODEBOOK_ELEMENT_FAST(c,off) (c->multiplicands[off])+#define CODEBOOK_ELEMENT_BASE(c) (0)++static int codebook_decode_start(vorb *f, Codebook *c)+{+ int z = -1;++ // type 0 is only legal in a scalar context+ if (c->lookup_type == 0)+ error(f, VORBIS_invalid_stream);+ else {+ DECODE_VQ(z,f,c);+ if (c->sparse) assert(z < c->sorted_entries);+ if (z < 0) { // check for EOP+ if (!f->bytes_in_seg)+ if (f->last_seg)+ return z;+ error(f, VORBIS_invalid_stream);+ }+ }+ return z;+}++static int codebook_decode(vorb *f, Codebook *c, float *output, int len)+{+ int i,z = codebook_decode_start(f,c);+ if (z < 0) return FALSE;+ if (len > c->dimensions) len = c->dimensions;++#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK+ if (c->lookup_type == 1) {+ float last = CODEBOOK_ELEMENT_BASE(c);+ int div = 1;+ for (i=0; i < len; ++i) {+ int off = (z / div) % c->lookup_values;+ float val = CODEBOOK_ELEMENT_FAST(c,off) + last;+ output[i] += val;+ if (c->sequence_p) last = val + c->minimum_value;+ div *= c->lookup_values;+ }+ return TRUE;+ }+#endif++ z *= c->dimensions;+ if (c->sequence_p) {+ float last = CODEBOOK_ELEMENT_BASE(c);+ for (i=0; i < len; ++i) {+ float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last;+ output[i] += val;+ last = val + c->minimum_value;+ }+ } else {+ float last = CODEBOOK_ELEMENT_BASE(c);+ for (i=0; i < len; ++i) {+ output[i] += CODEBOOK_ELEMENT_FAST(c,z+i) + last;+ }+ }++ return TRUE;+}++static int codebook_decode_step(vorb *f, Codebook *c, float *output, int len, int step)+{+ int i,z = codebook_decode_start(f,c);+ float last = CODEBOOK_ELEMENT_BASE(c);+ if (z < 0) return FALSE;+ if (len > c->dimensions) len = c->dimensions;++#ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK+ if (c->lookup_type == 1) {+ int div = 1;+ for (i=0; i < len; ++i) {+ int off = (z / div) % c->lookup_values;+ float val = CODEBOOK_ELEMENT_FAST(c,off) + last;+ output[i*step] += val;+ if (c->sequence_p) last = val;+ div *= c->lookup_values;+ }+ return TRUE;+ }+#endif++ z *= c->dimensions;+ for (i=0; i < len; ++i) {+ float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last;+ output[i*step] += val;+ if (c->sequence_p) last = val;+ }++ return TRUE;+}++static int codebook_decode_deinterleave_repeat(vorb *f, Codebook *c, float **outputs, int ch, int *c_inter_p, int *p_inter_p, int len, int total_decode)+{+ int c_inter = *c_inter_p;+ int p_inter = *p_inter_p;+ int i,z, effective = c->dimensions;++ // type 0 is only legal in a scalar context+ if (c->lookup_type == 0) return error(f, VORBIS_invalid_stream);++ while (total_decode > 0) {+ float last = CODEBOOK_ELEMENT_BASE(c);+ DECODE_VQ(z,f,c);+ #ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK+ assert(!c->sparse || z < c->sorted_entries);+ #endif+ if (z < 0) {+ if (!f->bytes_in_seg)+ if (f->last_seg) return FALSE;+ return error(f, VORBIS_invalid_stream);+ }++ // if this will take us off the end of the buffers, stop short!+ // we check by computing the length of the virtual interleaved+ // buffer (len*ch), our current offset within it (p_inter*ch)+(c_inter),+ // and the length we'll be using (effective)+ if (c_inter + p_inter*ch + effective > len * ch) {+ effective = len*ch - (p_inter*ch - c_inter);+ }++ #ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK+ if (c->lookup_type == 1) {+ int div = 1;+ for (i=0; i < effective; ++i) {+ int off = (z / div) % c->lookup_values;+ float val = CODEBOOK_ELEMENT_FAST(c,off) + last;+ if (outputs[c_inter])+ outputs[c_inter][p_inter] += val;+ if (++c_inter == ch) { c_inter = 0; ++p_inter; }+ if (c->sequence_p) last = val;+ div *= c->lookup_values;+ }+ } else+ #endif+ {+ z *= c->dimensions;+ if (c->sequence_p) {+ for (i=0; i < effective; ++i) {+ float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last;+ if (outputs[c_inter])+ outputs[c_inter][p_inter] += val;+ if (++c_inter == ch) { c_inter = 0; ++p_inter; }+ last = val;+ }+ } else {+ for (i=0; i < effective; ++i) {+ float val = CODEBOOK_ELEMENT_FAST(c,z+i) + last;+ if (outputs[c_inter])+ outputs[c_inter][p_inter] += val;+ if (++c_inter == ch) { c_inter = 0; ++p_inter; }+ }+ }+ }++ total_decode -= effective;+ }+ *c_inter_p = c_inter;+ *p_inter_p = p_inter;+ return TRUE;+}++static int predict_point(int x, int x0, int x1, int y0, int y1)+{+ int dy = y1 - y0;+ int adx = x1 - x0;+ // @OPTIMIZE: force int division to round in the right direction... is this necessary on x86?+ int err = abs(dy) * (x - x0);+ int off = err / adx;+ return dy < 0 ? y0 - off : y0 + off;+}++// the following table is block-copied from the specification+static float inverse_db_table[256] =+{+ 1.0649863e-07f, 1.1341951e-07f, 1.2079015e-07f, 1.2863978e-07f, + 1.3699951e-07f, 1.4590251e-07f, 1.5538408e-07f, 1.6548181e-07f, + 1.7623575e-07f, 1.8768855e-07f, 1.9988561e-07f, 2.1287530e-07f, + 2.2670913e-07f, 2.4144197e-07f, 2.5713223e-07f, 2.7384213e-07f, + 2.9163793e-07f, 3.1059021e-07f, 3.3077411e-07f, 3.5226968e-07f, + 3.7516214e-07f, 3.9954229e-07f, 4.2550680e-07f, 4.5315863e-07f, + 4.8260743e-07f, 5.1396998e-07f, 5.4737065e-07f, 5.8294187e-07f, + 6.2082472e-07f, 6.6116941e-07f, 7.0413592e-07f, 7.4989464e-07f, + 7.9862701e-07f, 8.5052630e-07f, 9.0579828e-07f, 9.6466216e-07f, + 1.0273513e-06f, 1.0941144e-06f, 1.1652161e-06f, 1.2409384e-06f, + 1.3215816e-06f, 1.4074654e-06f, 1.4989305e-06f, 1.5963394e-06f, + 1.7000785e-06f, 1.8105592e-06f, 1.9282195e-06f, 2.0535261e-06f, + 2.1869758e-06f, 2.3290978e-06f, 2.4804557e-06f, 2.6416497e-06f, + 2.8133190e-06f, 2.9961443e-06f, 3.1908506e-06f, 3.3982101e-06f, + 3.6190449e-06f, 3.8542308e-06f, 4.1047004e-06f, 4.3714470e-06f, + 4.6555282e-06f, 4.9580707e-06f, 5.2802740e-06f, 5.6234160e-06f, + 5.9888572e-06f, 6.3780469e-06f, 6.7925283e-06f, 7.2339451e-06f, + 7.7040476e-06f, 8.2047000e-06f, 8.7378876e-06f, 9.3057248e-06f, + 9.9104632e-06f, 1.0554501e-05f, 1.1240392e-05f, 1.1970856e-05f, + 1.2748789e-05f, 1.3577278e-05f, 1.4459606e-05f, 1.5399272e-05f, + 1.6400004e-05f, 1.7465768e-05f, 1.8600792e-05f, 1.9809576e-05f, + 2.1096914e-05f, 2.2467911e-05f, 2.3928002e-05f, 2.5482978e-05f, + 2.7139006e-05f, 2.8902651e-05f, 3.0780908e-05f, 3.2781225e-05f, + 3.4911534e-05f, 3.7180282e-05f, 3.9596466e-05f, 4.2169667e-05f, + 4.4910090e-05f, 4.7828601e-05f, 5.0936773e-05f, 5.4246931e-05f, + 5.7772202e-05f, 6.1526565e-05f, 6.5524908e-05f, 6.9783085e-05f, + 7.4317983e-05f, 7.9147585e-05f, 8.4291040e-05f, 8.9768747e-05f, + 9.5602426e-05f, 0.00010181521f, 0.00010843174f, 0.00011547824f, + 0.00012298267f, 0.00013097477f, 0.00013948625f, 0.00014855085f, + 0.00015820453f, 0.00016848555f, 0.00017943469f, 0.00019109536f, + 0.00020351382f, 0.00021673929f, 0.00023082423f, 0.00024582449f, + 0.00026179955f, 0.00027881276f, 0.00029693158f, 0.00031622787f, + 0.00033677814f, 0.00035866388f, 0.00038197188f, 0.00040679456f, + 0.00043323036f, 0.00046138411f, 0.00049136745f, 0.00052329927f, + 0.00055730621f, 0.00059352311f, 0.00063209358f, 0.00067317058f, + 0.00071691700f, 0.00076350630f, 0.00081312324f, 0.00086596457f, + 0.00092223983f, 0.00098217216f, 0.0010459992f, 0.0011139742f, + 0.0011863665f, 0.0012634633f, 0.0013455702f, 0.0014330129f, + 0.0015261382f, 0.0016253153f, 0.0017309374f, 0.0018434235f, + 0.0019632195f, 0.0020908006f, 0.0022266726f, 0.0023713743f, + 0.0025254795f, 0.0026895994f, 0.0028643847f, 0.0030505286f, + 0.0032487691f, 0.0034598925f, 0.0036847358f, 0.0039241906f, + 0.0041792066f, 0.0044507950f, 0.0047400328f, 0.0050480668f, + 0.0053761186f, 0.0057254891f, 0.0060975636f, 0.0064938176f, + 0.0069158225f, 0.0073652516f, 0.0078438871f, 0.0083536271f, + 0.0088964928f, 0.009474637f, 0.010090352f, 0.010746080f, + 0.011444421f, 0.012188144f, 0.012980198f, 0.013823725f, + 0.014722068f, 0.015678791f, 0.016697687f, 0.017782797f, + 0.018938423f, 0.020169149f, 0.021479854f, 0.022875735f, + 0.024362330f, 0.025945531f, 0.027631618f, 0.029427276f, + 0.031339626f, 0.033376252f, 0.035545228f, 0.037855157f, + 0.040315199f, 0.042935108f, 0.045725273f, 0.048696758f, + 0.051861348f, 0.055231591f, 0.058820850f, 0.062643361f, + 0.066714279f, 0.071049749f, 0.075666962f, 0.080584227f, + 0.085821044f, 0.091398179f, 0.097337747f, 0.10366330f, + 0.11039993f, 0.11757434f, 0.12521498f, 0.13335215f, + 0.14201813f, 0.15124727f, 0.16107617f, 0.17154380f, + 0.18269168f, 0.19456402f, 0.20720788f, 0.22067342f, + 0.23501402f, 0.25028656f, 0.26655159f, 0.28387361f, + 0.30232132f, 0.32196786f, 0.34289114f, 0.36517414f, + 0.38890521f, 0.41417847f, 0.44109412f, 0.46975890f, + 0.50028648f, 0.53279791f, 0.56742212f, 0.60429640f, + 0.64356699f, 0.68538959f, 0.72993007f, 0.77736504f, + 0.82788260f, 0.88168307f, 0.9389798f, 1.0f+};+++// @OPTIMIZE: if you want to replace this bresenham line-drawing routine,+// note that you must produce bit-identical output to decode correctly;+// this specific sequence of operations is specified in the spec (it's+// drawing integer-quantized frequency-space lines that the encoder+// expects to be exactly the same)+// ... also, isn't the whole point of Bresenham's algorithm to NOT+// have to divide in the setup? sigh.+#ifndef STB_VORBIS_NO_DEFER_FLOOR+#define LINE_OP(a,b) a *= b+#else+#define LINE_OP(a,b) a = b+#endif++#ifdef STB_VORBIS_DIVIDE_TABLE+#define DIVTAB_NUMER 32+#define DIVTAB_DENOM 64+int8 integer_divide_table[DIVTAB_NUMER][DIVTAB_DENOM]; // 2KB+#endif++static __forceinline void draw_line(float *output, int x0, int y0, int x1, int y1, int n)+{+ int dy = y1 - y0;+ int adx = x1 - x0;+ int ady = abs(dy);+ int base;+ int x=x0,y=y0;+ int err = 0;+ int sy;++#ifdef STB_VORBIS_DIVIDE_TABLE+ if (adx < DIVTAB_DENOM && ady < DIVTAB_NUMER) {+ if (dy < 0) {+ base = -integer_divide_table[ady][adx];+ sy = base-1;+ } else {+ base = integer_divide_table[ady][adx];+ sy = base+1;+ }+ } else {+ base = dy / adx;+ if (dy < 0)+ sy = base - 1;+ else+ sy = base+1;+ }+#else+ base = dy / adx;+ if (dy < 0)+ sy = base - 1;+ else+ sy = base+1;+#endif+ ady -= abs(base) * adx;+ if (x1 > n) x1 = n;+ if (x < x1) {+ LINE_OP(output[x], inverse_db_table[y]);+ for (++x; x < x1; ++x) {+ err += ady;+ if (err >= adx) {+ err -= adx;+ y += sy;+ } else+ y += base;+ LINE_OP(output[x], inverse_db_table[y]);+ }+ }+}++static int residue_decode(vorb *f, Codebook *book, float *target, int offset, int n, int rtype)+{+ int k;+ if (rtype == 0) {+ int step = n / book->dimensions;+ for (k=0; k < step; ++k)+ if (!codebook_decode_step(f, book, target+offset+k, n-offset-k, step))+ return FALSE;+ } else {+ for (k=0; k < n; ) {+ if (!codebook_decode(f, book, target+offset, n-k))+ return FALSE;+ k += book->dimensions;+ offset += book->dimensions;+ }+ }+ return TRUE;+}++// n is 1/2 of the blocksize --+// specification: "Correct per-vector decode length is [n]/2"+static void decode_residue(vorb *f, float *residue_buffers[], int ch, int n, int rn, uint8 *do_not_decode)+{+ int i,j,pass;+ Residue *r = f->residue_config + rn;+ int rtype = f->residue_types[rn];+ int c = r->classbook;+ int classwords = f->codebooks[c].dimensions;+ unsigned int actual_size = rtype == 2 ? n*2 : n;+ unsigned int limit_r_begin = (r->begin < actual_size ? r->begin : actual_size);+ unsigned int limit_r_end = (r->end < actual_size ? r->end : actual_size);+ int n_read = limit_r_end - limit_r_begin;+ int part_read = n_read / r->part_size;+ int temp_alloc_point = temp_alloc_save(f);+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ uint8 ***part_classdata = (uint8 ***) temp_block_array(f,f->channels, part_read * sizeof(**part_classdata));+ #else+ int **classifications = (int **) temp_block_array(f,f->channels, part_read * sizeof(**classifications));+ #endif++ CHECK(f);++ for (i=0; i < ch; ++i)+ if (!do_not_decode[i])+ memset(residue_buffers[i], 0, sizeof(float) * n);++ if (rtype == 2 && ch != 1) {+ for (j=0; j < ch; ++j)+ if (!do_not_decode[j])+ break;+ if (j == ch)+ goto done;++ for (pass=0; pass < 8; ++pass) {+ int pcount = 0, class_set = 0;+ if (ch == 2) {+ while (pcount < part_read) {+ int z = r->begin + pcount*r->part_size;+ int c_inter = (z & 1), p_inter = z>>1;+ if (pass == 0) {+ Codebook *c = f->codebooks+r->classbook;+ int q;+ DECODE(q,f,c);+ if (q == EOP) goto done;+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ part_classdata[0][class_set] = r->classdata[q];+ #else+ for (i=classwords-1; i >= 0; --i) {+ classifications[0][i+pcount] = q % r->classifications;+ q /= r->classifications;+ }+ #endif+ }+ for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {+ int z = r->begin + pcount*r->part_size;+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ int c = part_classdata[0][class_set][i];+ #else+ int c = classifications[0][pcount];+ #endif+ int b = r->residue_books[c][pass];+ if (b >= 0) {+ Codebook *book = f->codebooks + b;+ #ifdef STB_VORBIS_DIVIDES_IN_CODEBOOK+ if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))+ goto done;+ #else+ // saves 1%+ if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))+ goto done;+ #endif+ } else {+ z += r->part_size;+ c_inter = z & 1;+ p_inter = z >> 1;+ }+ }+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ ++class_set;+ #endif+ }+ } else if (ch == 1) {+ while (pcount < part_read) {+ int z = r->begin + pcount*r->part_size;+ int c_inter = 0, p_inter = z;+ if (pass == 0) {+ Codebook *c = f->codebooks+r->classbook;+ int q;+ DECODE(q,f,c);+ if (q == EOP) goto done;+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ part_classdata[0][class_set] = r->classdata[q];+ #else+ for (i=classwords-1; i >= 0; --i) {+ classifications[0][i+pcount] = q % r->classifications;+ q /= r->classifications;+ }+ #endif+ }+ for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {+ int z = r->begin + pcount*r->part_size;+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ int c = part_classdata[0][class_set][i];+ #else+ int c = classifications[0][pcount];+ #endif+ int b = r->residue_books[c][pass];+ if (b >= 0) {+ Codebook *book = f->codebooks + b;+ if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))+ goto done;+ } else {+ z += r->part_size;+ c_inter = 0;+ p_inter = z;+ }+ }+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ ++class_set;+ #endif+ }+ } else {+ while (pcount < part_read) {+ int z = r->begin + pcount*r->part_size;+ int c_inter = z % ch, p_inter = z/ch;+ if (pass == 0) {+ Codebook *c = f->codebooks+r->classbook;+ int q;+ DECODE(q,f,c);+ if (q == EOP) goto done;+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ part_classdata[0][class_set] = r->classdata[q];+ #else+ for (i=classwords-1; i >= 0; --i) {+ classifications[0][i+pcount] = q % r->classifications;+ q /= r->classifications;+ }+ #endif+ }+ for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {+ int z = r->begin + pcount*r->part_size;+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ int c = part_classdata[0][class_set][i];+ #else+ int c = classifications[0][pcount];+ #endif+ int b = r->residue_books[c][pass];+ if (b >= 0) {+ Codebook *book = f->codebooks + b;+ if (!codebook_decode_deinterleave_repeat(f, book, residue_buffers, ch, &c_inter, &p_inter, n, r->part_size))+ goto done;+ } else {+ z += r->part_size;+ c_inter = z % ch;+ p_inter = z / ch;+ }+ }+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ ++class_set;+ #endif+ }+ }+ }+ goto done;+ }+ CHECK(f);++ for (pass=0; pass < 8; ++pass) {+ int pcount = 0, class_set=0;+ while (pcount < part_read) {+ if (pass == 0) {+ for (j=0; j < ch; ++j) {+ if (!do_not_decode[j]) {+ Codebook *c = f->codebooks+r->classbook;+ int temp;+ DECODE(temp,f,c);+ if (temp == EOP) goto done;+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ part_classdata[j][class_set] = r->classdata[temp];+ #else+ for (i=classwords-1; i >= 0; --i) {+ classifications[j][i+pcount] = temp % r->classifications;+ temp /= r->classifications;+ }+ #endif+ }+ }+ }+ for (i=0; i < classwords && pcount < part_read; ++i, ++pcount) {+ for (j=0; j < ch; ++j) {+ if (!do_not_decode[j]) {+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ int c = part_classdata[j][class_set][i];+ #else+ int c = classifications[j][pcount];+ #endif+ int b = r->residue_books[c][pass];+ if (b >= 0) {+ float *target = residue_buffers[j];+ int offset = r->begin + pcount * r->part_size;+ int n = r->part_size;+ Codebook *book = f->codebooks + b;+ if (!residue_decode(f, book, target, offset, n, rtype))+ goto done;+ }+ }+ }+ }+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ ++class_set;+ #endif+ }+ }+ done:+ CHECK(f);+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ temp_free(f,part_classdata);+ #else+ temp_free(f,classifications);+ #endif+ temp_alloc_restore(f,temp_alloc_point);+}+++#if 0+// slow way for debugging+void inverse_mdct_slow(float *buffer, int n)+{+ int i,j;+ int n2 = n >> 1;+ float *x = (float *) malloc(sizeof(*x) * n2);+ memcpy(x, buffer, sizeof(*x) * n2);+ for (i=0; i < n; ++i) {+ float acc = 0;+ for (j=0; j < n2; ++j)+ // formula from paper:+ //acc += n/4.0f * x[j] * (float) cos(M_PI / 2 / n * (2 * i + 1 + n/2.0)*(2*j+1));+ // formula from wikipedia+ //acc += 2.0f / n2 * x[j] * (float) cos(M_PI/n2 * (i + 0.5 + n2/2)*(j + 0.5));+ // these are equivalent, except the formula from the paper inverts the multiplier!+ // however, what actually works is NO MULTIPLIER!?!+ //acc += 64 * 2.0f / n2 * x[j] * (float) cos(M_PI/n2 * (i + 0.5 + n2/2)*(j + 0.5));+ acc += x[j] * (float) cos(M_PI / 2 / n * (2 * i + 1 + n/2.0)*(2*j+1));+ buffer[i] = acc;+ }+ free(x);+}+#elif 0+// same as above, but just barely able to run in real time on modern machines+void inverse_mdct_slow(float *buffer, int n, vorb *f, int blocktype)+{+ float mcos[16384];+ int i,j;+ int n2 = n >> 1, nmask = (n << 2) -1;+ float *x = (float *) malloc(sizeof(*x) * n2);+ memcpy(x, buffer, sizeof(*x) * n2);+ for (i=0; i < 4*n; ++i)+ mcos[i] = (float) cos(M_PI / 2 * i / n);++ for (i=0; i < n; ++i) {+ float acc = 0;+ for (j=0; j < n2; ++j)+ acc += x[j] * mcos[(2 * i + 1 + n2)*(2*j+1) & nmask];+ buffer[i] = acc;+ }+ free(x);+}+#elif 0+// transform to use a slow dct-iv; this is STILL basically trivial,+// but only requires half as many ops+void dct_iv_slow(float *buffer, int n)+{+ float mcos[16384];+ float x[2048];+ int i,j;+ int n2 = n >> 1, nmask = (n << 3) - 1;+ memcpy(x, buffer, sizeof(*x) * n);+ for (i=0; i < 8*n; ++i)+ mcos[i] = (float) cos(M_PI / 4 * i / n);+ for (i=0; i < n; ++i) {+ float acc = 0;+ for (j=0; j < n; ++j)+ acc += x[j] * mcos[((2 * i + 1)*(2*j+1)) & nmask];+ buffer[i] = acc;+ }+}++void inverse_mdct_slow(float *buffer, int n, vorb *f, int blocktype)+{+ int i, n4 = n >> 2, n2 = n >> 1, n3_4 = n - n4;+ float temp[4096];++ memcpy(temp, buffer, n2 * sizeof(float));+ dct_iv_slow(temp, n2); // returns -c'-d, a-b'++ for (i=0; i < n4 ; ++i) buffer[i] = temp[i+n4]; // a-b'+ for ( ; i < n3_4; ++i) buffer[i] = -temp[n3_4 - i - 1]; // b-a', c+d'+ for ( ; i < n ; ++i) buffer[i] = -temp[i - n3_4]; // c'+d+}+#endif++#ifndef LIBVORBIS_MDCT+#define LIBVORBIS_MDCT 0+#endif++#if LIBVORBIS_MDCT+// directly call the vorbis MDCT using an interface documented+// by Jeff Roberts... useful for performance comparison+typedef struct +{+ int n;+ int log2n;+ + float *trig;+ int *bitrev;++ float scale;+} mdct_lookup;++extern void mdct_init(mdct_lookup *lookup, int n);+extern void mdct_clear(mdct_lookup *l);+extern void mdct_backward(mdct_lookup *init, float *in, float *out);++mdct_lookup M1,M2;++void inverse_mdct(float *buffer, int n, vorb *f, int blocktype)+{+ mdct_lookup *M;+ if (M1.n == n) M = &M1;+ else if (M2.n == n) M = &M2;+ else if (M1.n == 0) { mdct_init(&M1, n); M = &M1; }+ else { + if (M2.n) __asm int 3;+ mdct_init(&M2, n);+ M = &M2;+ }++ mdct_backward(M, buffer, buffer);+}+#endif+++// the following were split out into separate functions while optimizing;+// they could be pushed back up but eh. __forceinline showed no change;+// they're probably already being inlined.+static void imdct_step3_iter0_loop(int n, float *e, int i_off, int k_off, float *A)+{+ float *ee0 = e + i_off;+ float *ee2 = ee0 + k_off;+ int i;++ assert((n & 3) == 0);+ for (i=(n>>2); i > 0; --i) {+ float k00_20, k01_21;+ k00_20 = ee0[ 0] - ee2[ 0];+ k01_21 = ee0[-1] - ee2[-1];+ ee0[ 0] += ee2[ 0];//ee0[ 0] = ee0[ 0] + ee2[ 0];+ ee0[-1] += ee2[-1];//ee0[-1] = ee0[-1] + ee2[-1];+ ee2[ 0] = k00_20 * A[0] - k01_21 * A[1];+ ee2[-1] = k01_21 * A[0] + k00_20 * A[1];+ A += 8;++ k00_20 = ee0[-2] - ee2[-2];+ k01_21 = ee0[-3] - ee2[-3];+ ee0[-2] += ee2[-2];//ee0[-2] = ee0[-2] + ee2[-2];+ ee0[-3] += ee2[-3];//ee0[-3] = ee0[-3] + ee2[-3];+ ee2[-2] = k00_20 * A[0] - k01_21 * A[1];+ ee2[-3] = k01_21 * A[0] + k00_20 * A[1];+ A += 8;++ k00_20 = ee0[-4] - ee2[-4];+ k01_21 = ee0[-5] - ee2[-5];+ ee0[-4] += ee2[-4];//ee0[-4] = ee0[-4] + ee2[-4];+ ee0[-5] += ee2[-5];//ee0[-5] = ee0[-5] + ee2[-5];+ ee2[-4] = k00_20 * A[0] - k01_21 * A[1];+ ee2[-5] = k01_21 * A[0] + k00_20 * A[1];+ A += 8;++ k00_20 = ee0[-6] - ee2[-6];+ k01_21 = ee0[-7] - ee2[-7];+ ee0[-6] += ee2[-6];//ee0[-6] = ee0[-6] + ee2[-6];+ ee0[-7] += ee2[-7];//ee0[-7] = ee0[-7] + ee2[-7];+ ee2[-6] = k00_20 * A[0] - k01_21 * A[1];+ ee2[-7] = k01_21 * A[0] + k00_20 * A[1];+ A += 8;+ ee0 -= 8;+ ee2 -= 8;+ }+}++static void imdct_step3_inner_r_loop(int lim, float *e, int d0, int k_off, float *A, int k1)+{+ int i;+ float k00_20, k01_21;++ float *e0 = e + d0;+ float *e2 = e0 + k_off;++ for (i=lim >> 2; i > 0; --i) {+ k00_20 = e0[-0] - e2[-0];+ k01_21 = e0[-1] - e2[-1];+ e0[-0] += e2[-0];//e0[-0] = e0[-0] + e2[-0];+ e0[-1] += e2[-1];//e0[-1] = e0[-1] + e2[-1];+ e2[-0] = (k00_20)*A[0] - (k01_21) * A[1];+ e2[-1] = (k01_21)*A[0] + (k00_20) * A[1];++ A += k1;++ k00_20 = e0[-2] - e2[-2];+ k01_21 = e0[-3] - e2[-3];+ e0[-2] += e2[-2];//e0[-2] = e0[-2] + e2[-2];+ e0[-3] += e2[-3];//e0[-3] = e0[-3] + e2[-3];+ e2[-2] = (k00_20)*A[0] - (k01_21) * A[1];+ e2[-3] = (k01_21)*A[0] + (k00_20) * A[1];++ A += k1;++ k00_20 = e0[-4] - e2[-4];+ k01_21 = e0[-5] - e2[-5];+ e0[-4] += e2[-4];//e0[-4] = e0[-4] + e2[-4];+ e0[-5] += e2[-5];//e0[-5] = e0[-5] + e2[-5];+ e2[-4] = (k00_20)*A[0] - (k01_21) * A[1];+ e2[-5] = (k01_21)*A[0] + (k00_20) * A[1];++ A += k1;++ k00_20 = e0[-6] - e2[-6];+ k01_21 = e0[-7] - e2[-7];+ e0[-6] += e2[-6];//e0[-6] = e0[-6] + e2[-6];+ e0[-7] += e2[-7];//e0[-7] = e0[-7] + e2[-7];+ e2[-6] = (k00_20)*A[0] - (k01_21) * A[1];+ e2[-7] = (k01_21)*A[0] + (k00_20) * A[1];++ e0 -= 8;+ e2 -= 8;++ A += k1;+ }+}++static void imdct_step3_inner_s_loop(int n, float *e, int i_off, int k_off, float *A, int a_off, int k0)+{+ int i;+ float A0 = A[0];+ float A1 = A[0+1];+ float A2 = A[0+a_off];+ float A3 = A[0+a_off+1];+ float A4 = A[0+a_off*2+0];+ float A5 = A[0+a_off*2+1];+ float A6 = A[0+a_off*3+0];+ float A7 = A[0+a_off*3+1];++ float k00,k11;++ float *ee0 = e +i_off;+ float *ee2 = ee0+k_off;++ for (i=n; i > 0; --i) {+ k00 = ee0[ 0] - ee2[ 0];+ k11 = ee0[-1] - ee2[-1];+ ee0[ 0] = ee0[ 0] + ee2[ 0];+ ee0[-1] = ee0[-1] + ee2[-1];+ ee2[ 0] = (k00) * A0 - (k11) * A1;+ ee2[-1] = (k11) * A0 + (k00) * A1;++ k00 = ee0[-2] - ee2[-2];+ k11 = ee0[-3] - ee2[-3];+ ee0[-2] = ee0[-2] + ee2[-2];+ ee0[-3] = ee0[-3] + ee2[-3];+ ee2[-2] = (k00) * A2 - (k11) * A3;+ ee2[-3] = (k11) * A2 + (k00) * A3;++ k00 = ee0[-4] - ee2[-4];+ k11 = ee0[-5] - ee2[-5];+ ee0[-4] = ee0[-4] + ee2[-4];+ ee0[-5] = ee0[-5] + ee2[-5];+ ee2[-4] = (k00) * A4 - (k11) * A5;+ ee2[-5] = (k11) * A4 + (k00) * A5;++ k00 = ee0[-6] - ee2[-6];+ k11 = ee0[-7] - ee2[-7];+ ee0[-6] = ee0[-6] + ee2[-6];+ ee0[-7] = ee0[-7] + ee2[-7];+ ee2[-6] = (k00) * A6 - (k11) * A7;+ ee2[-7] = (k11) * A6 + (k00) * A7;++ ee0 -= k0;+ ee2 -= k0;+ }+}++static __forceinline void iter_54(float *z)+{+ float k00,k11,k22,k33;+ float y0,y1,y2,y3;++ k00 = z[ 0] - z[-4];+ y0 = z[ 0] + z[-4];+ y2 = z[-2] + z[-6];+ k22 = z[-2] - z[-6];++ z[-0] = y0 + y2; // z0 + z4 + z2 + z6+ z[-2] = y0 - y2; // z0 + z4 - z2 - z6++ // done with y0,y2++ k33 = z[-3] - z[-7];++ z[-4] = k00 + k33; // z0 - z4 + z3 - z7+ z[-6] = k00 - k33; // z0 - z4 - z3 + z7++ // done with k33++ k11 = z[-1] - z[-5];+ y1 = z[-1] + z[-5];+ y3 = z[-3] + z[-7];++ z[-1] = y1 + y3; // z1 + z5 + z3 + z7+ z[-3] = y1 - y3; // z1 + z5 - z3 - z7+ z[-5] = k11 - k22; // z1 - z5 + z2 - z6+ z[-7] = k11 + k22; // z1 - z5 - z2 + z6+}++static void imdct_step3_inner_s_loop_ld654(int n, float *e, int i_off, float *A, int base_n)+{+ int a_off = base_n >> 3;+ float A2 = A[0+a_off];+ float *z = e + i_off;+ float *base = z - 16 * n;++ while (z > base) {+ float k00,k11;++ k00 = z[-0] - z[-8];+ k11 = z[-1] - z[-9];+ z[-0] = z[-0] + z[-8];+ z[-1] = z[-1] + z[-9];+ z[-8] = k00;+ z[-9] = k11 ;++ k00 = z[ -2] - z[-10];+ k11 = z[ -3] - z[-11];+ z[ -2] = z[ -2] + z[-10];+ z[ -3] = z[ -3] + z[-11];+ z[-10] = (k00+k11) * A2;+ z[-11] = (k11-k00) * A2;++ k00 = z[-12] - z[ -4]; // reverse to avoid a unary negation+ k11 = z[ -5] - z[-13];+ z[ -4] = z[ -4] + z[-12];+ z[ -5] = z[ -5] + z[-13];+ z[-12] = k11;+ z[-13] = k00;++ k00 = z[-14] - z[ -6]; // reverse to avoid a unary negation+ k11 = z[ -7] - z[-15];+ z[ -6] = z[ -6] + z[-14];+ z[ -7] = z[ -7] + z[-15];+ z[-14] = (k00+k11) * A2;+ z[-15] = (k00-k11) * A2;++ iter_54(z);+ iter_54(z-8);+ z -= 16;+ }+}++static void inverse_mdct(float *buffer, int n, vorb *f, int blocktype)+{+ int n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l;+ int ld;+ // @OPTIMIZE: reduce register pressure by using fewer variables?+ int save_point = temp_alloc_save(f);+ float *buf2 = (float *) temp_alloc(f, n2 * sizeof(*buf2));+ float *u=NULL,*v=NULL;+ // twiddle factors+ float *A = f->A[blocktype];++ // IMDCT algorithm from "The use of multirate filter banks for coding of high quality digital audio"+ // See notes about bugs in that paper in less-optimal implementation 'inverse_mdct_old' after this function.++ // kernel from paper+++ // merged:+ // copy and reflect spectral data+ // step 0++ // note that it turns out that the items added together during+ // this step are, in fact, being added to themselves (as reflected+ // by step 0). inexplicable inefficiency! this became obvious+ // once I combined the passes.++ // so there's a missing 'times 2' here (for adding X to itself).+ // this propogates through linearly to the end, where the numbers+ // are 1/2 too small, and need to be compensated for.++ {+ float *d,*e, *AA, *e_stop;+ d = &buf2[n2-2];+ AA = A;+ e = &buffer[0];+ e_stop = &buffer[n2];+ while (e != e_stop) {+ d[1] = (e[0] * AA[0] - e[2]*AA[1]);+ d[0] = (e[0] * AA[1] + e[2]*AA[0]);+ d -= 2;+ AA += 2;+ e += 4;+ }++ e = &buffer[n2-3];+ while (d >= buf2) {+ d[1] = (-e[2] * AA[0] - -e[0]*AA[1]);+ d[0] = (-e[2] * AA[1] + -e[0]*AA[0]);+ d -= 2;+ AA += 2;+ e -= 4;+ }+ }++ // now we use symbolic names for these, so that we can+ // possibly swap their meaning as we change which operations+ // are in place++ u = buffer;+ v = buf2;++ // step 2 (paper output is w, now u)+ // this could be in place, but the data ends up in the wrong+ // place... _somebody_'s got to swap it, so this is nominated+ {+ float *AA = &A[n2-8];+ float *d0,*d1, *e0, *e1;++ e0 = &v[n4];+ e1 = &v[0];++ d0 = &u[n4];+ d1 = &u[0];++ while (AA >= A) {+ float v40_20, v41_21;++ v41_21 = e0[1] - e1[1];+ v40_20 = e0[0] - e1[0];+ d0[1] = e0[1] + e1[1];+ d0[0] = e0[0] + e1[0];+ d1[1] = v41_21*AA[4] - v40_20*AA[5];+ d1[0] = v40_20*AA[4] + v41_21*AA[5];++ v41_21 = e0[3] - e1[3];+ v40_20 = e0[2] - e1[2];+ d0[3] = e0[3] + e1[3];+ d0[2] = e0[2] + e1[2];+ d1[3] = v41_21*AA[0] - v40_20*AA[1];+ d1[2] = v40_20*AA[0] + v41_21*AA[1];++ AA -= 8;++ d0 += 4;+ d1 += 4;+ e0 += 4;+ e1 += 4;+ }+ }++ // step 3+ ld = ilog(n) - 1; // ilog is off-by-one from normal definitions++ // optimized step 3:++ // the original step3 loop can be nested r inside s or s inside r;+ // it's written originally as s inside r, but this is dumb when r+ // iterates many times, and s few. So I have two copies of it and+ // switch between them halfway.++ // this is iteration 0 of step 3+ imdct_step3_iter0_loop(n >> 4, u, n2-1-n4*0, -(n >> 3), A);+ imdct_step3_iter0_loop(n >> 4, u, n2-1-n4*1, -(n >> 3), A);++ // this is iteration 1 of step 3+ imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*0, -(n >> 4), A, 16);+ imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*1, -(n >> 4), A, 16);+ imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*2, -(n >> 4), A, 16);+ imdct_step3_inner_r_loop(n >> 5, u, n2-1 - n8*3, -(n >> 4), A, 16);++ l=2;+ for (; l < (ld-3)>>1; ++l) {+ int k0 = n >> (l+2), k0_2 = k0>>1;+ int lim = 1 << (l+1);+ int i;+ for (i=0; i < lim; ++i)+ imdct_step3_inner_r_loop(n >> (l+4), u, n2-1 - k0*i, -k0_2, A, 1 << (l+3));+ }++ for (; l < ld-6; ++l) {+ int k0 = n >> (l+2), k1 = 1 << (l+3), k0_2 = k0>>1;+ int rlim = n >> (l+6), r;+ int lim = 1 << (l+1);+ int i_off;+ float *A0 = A;+ i_off = n2-1;+ for (r=rlim; r > 0; --r) {+ imdct_step3_inner_s_loop(lim, u, i_off, -k0_2, A0, k1, k0);+ A0 += k1*4;+ i_off -= 8;+ }+ }++ // iterations with count:+ // ld-6,-5,-4 all interleaved together+ // the big win comes from getting rid of needless flops+ // due to the constants on pass 5 & 4 being all 1 and 0;+ // combining them to be simultaneous to improve cache made little difference+ imdct_step3_inner_s_loop_ld654(n >> 5, u, n2-1, A, n);++ // output is u++ // step 4, 5, and 6+ // cannot be in-place because of step 5+ {+ uint16 *bitrev = f->bit_reverse[blocktype];+ // weirdly, I'd have thought reading sequentially and writing+ // erratically would have been better than vice-versa, but in+ // fact that's not what my testing showed. (That is, with+ // j = bitreverse(i), do you read i and write j, or read j and write i.)++ float *d0 = &v[n4-4];+ float *d1 = &v[n2-4];+ while (d0 >= v) {+ int k4;++ k4 = bitrev[0];+ d1[3] = u[k4+0];+ d1[2] = u[k4+1];+ d0[3] = u[k4+2];+ d0[2] = u[k4+3];++ k4 = bitrev[1];+ d1[1] = u[k4+0];+ d1[0] = u[k4+1];+ d0[1] = u[k4+2];+ d0[0] = u[k4+3];+ + d0 -= 4;+ d1 -= 4;+ bitrev += 2;+ }+ }+ // (paper output is u, now v)+++ // data must be in buf2+ assert(v == buf2);++ // step 7 (paper output is v, now v)+ // this is now in place+ {+ float *C = f->C[blocktype];+ float *d, *e;++ d = v;+ e = v + n2 - 4;++ while (d < e) {+ float a02,a11,b0,b1,b2,b3;++ a02 = d[0] - e[2];+ a11 = d[1] + e[3];++ b0 = C[1]*a02 + C[0]*a11;+ b1 = C[1]*a11 - C[0]*a02;++ b2 = d[0] + e[ 2];+ b3 = d[1] - e[ 3];++ d[0] = b2 + b0;+ d[1] = b3 + b1;+ e[2] = b2 - b0;+ e[3] = b1 - b3;++ a02 = d[2] - e[0];+ a11 = d[3] + e[1];++ b0 = C[3]*a02 + C[2]*a11;+ b1 = C[3]*a11 - C[2]*a02;++ b2 = d[2] + e[ 0];+ b3 = d[3] - e[ 1];++ d[2] = b2 + b0;+ d[3] = b3 + b1;+ e[0] = b2 - b0;+ e[1] = b1 - b3;++ C += 4;+ d += 4;+ e -= 4;+ }+ }++ // data must be in buf2+++ // step 8+decode (paper output is X, now buffer)+ // this generates pairs of data a la 8 and pushes them directly through+ // the decode kernel (pushing rather than pulling) to avoid having+ // to make another pass later++ // this cannot POSSIBLY be in place, so we refer to the buffers directly++ {+ float *d0,*d1,*d2,*d3;++ float *B = f->B[blocktype] + n2 - 8;+ float *e = buf2 + n2 - 8;+ d0 = &buffer[0];+ d1 = &buffer[n2-4];+ d2 = &buffer[n2];+ d3 = &buffer[n-4];+ while (e >= v) {+ float p0,p1,p2,p3;++ p3 = e[6]*B[7] - e[7]*B[6];+ p2 = -e[6]*B[6] - e[7]*B[7]; ++ d0[0] = p3;+ d1[3] = - p3;+ d2[0] = p2;+ d3[3] = p2;++ p1 = e[4]*B[5] - e[5]*B[4];+ p0 = -e[4]*B[4] - e[5]*B[5]; ++ d0[1] = p1;+ d1[2] = - p1;+ d2[1] = p0;+ d3[2] = p0;++ p3 = e[2]*B[3] - e[3]*B[2];+ p2 = -e[2]*B[2] - e[3]*B[3]; ++ d0[2] = p3;+ d1[1] = - p3;+ d2[2] = p2;+ d3[1] = p2;++ p1 = e[0]*B[1] - e[1]*B[0];+ p0 = -e[0]*B[0] - e[1]*B[1]; ++ d0[3] = p1;+ d1[0] = - p1;+ d2[3] = p0;+ d3[0] = p0;++ B -= 8;+ e -= 8;+ d0 += 4;+ d2 += 4;+ d1 -= 4;+ d3 -= 4;+ }+ }++ temp_free(f,buf2);+ temp_alloc_restore(f,save_point);+}++#if 0+// this is the original version of the above code, if you want to optimize it from scratch+void inverse_mdct_naive(float *buffer, int n)+{+ float s;+ float A[1 << 12], B[1 << 12], C[1 << 11];+ int i,k,k2,k4, n2 = n >> 1, n4 = n >> 2, n8 = n >> 3, l;+ int n3_4 = n - n4, ld;+ // how can they claim this only uses N words?!+ // oh, because they're only used sparsely, whoops+ float u[1 << 13], X[1 << 13], v[1 << 13], w[1 << 13];+ // set up twiddle factors++ for (k=k2=0; k < n4; ++k,k2+=2) {+ A[k2 ] = (float) cos(4*k*M_PI/n);+ A[k2+1] = (float) -sin(4*k*M_PI/n);+ B[k2 ] = (float) cos((k2+1)*M_PI/n/2);+ B[k2+1] = (float) sin((k2+1)*M_PI/n/2);+ }+ for (k=k2=0; k < n8; ++k,k2+=2) {+ C[k2 ] = (float) cos(2*(k2+1)*M_PI/n);+ C[k2+1] = (float) -sin(2*(k2+1)*M_PI/n);+ }++ // IMDCT algorithm from "The use of multirate filter banks for coding of high quality digital audio"+ // Note there are bugs in that pseudocode, presumably due to them attempting+ // to rename the arrays nicely rather than representing the way their actual+ // implementation bounces buffers back and forth. As a result, even in the+ // "some formulars corrected" version, a direct implementation fails. These+ // are noted below as "paper bug".++ // copy and reflect spectral data+ for (k=0; k < n2; ++k) u[k] = buffer[k];+ for ( ; k < n ; ++k) u[k] = -buffer[n - k - 1];+ // kernel from paper+ // step 1+ for (k=k2=k4=0; k < n4; k+=1, k2+=2, k4+=4) {+ v[n-k4-1] = (u[k4] - u[n-k4-1]) * A[k2] - (u[k4+2] - u[n-k4-3])*A[k2+1];+ v[n-k4-3] = (u[k4] - u[n-k4-1]) * A[k2+1] + (u[k4+2] - u[n-k4-3])*A[k2];+ }+ // step 2+ for (k=k4=0; k < n8; k+=1, k4+=4) {+ w[n2+3+k4] = v[n2+3+k4] + v[k4+3];+ w[n2+1+k4] = v[n2+1+k4] + v[k4+1];+ w[k4+3] = (v[n2+3+k4] - v[k4+3])*A[n2-4-k4] - (v[n2+1+k4]-v[k4+1])*A[n2-3-k4];+ w[k4+1] = (v[n2+1+k4] - v[k4+1])*A[n2-4-k4] + (v[n2+3+k4]-v[k4+3])*A[n2-3-k4];+ }+ // step 3+ ld = ilog(n) - 1; // ilog is off-by-one from normal definitions+ for (l=0; l < ld-3; ++l) {+ int k0 = n >> (l+2), k1 = 1 << (l+3);+ int rlim = n >> (l+4), r4, r;+ int s2lim = 1 << (l+2), s2;+ for (r=r4=0; r < rlim; r4+=4,++r) {+ for (s2=0; s2 < s2lim; s2+=2) {+ u[n-1-k0*s2-r4] = w[n-1-k0*s2-r4] + w[n-1-k0*(s2+1)-r4];+ u[n-3-k0*s2-r4] = w[n-3-k0*s2-r4] + w[n-3-k0*(s2+1)-r4];+ u[n-1-k0*(s2+1)-r4] = (w[n-1-k0*s2-r4] - w[n-1-k0*(s2+1)-r4]) * A[r*k1]+ - (w[n-3-k0*s2-r4] - w[n-3-k0*(s2+1)-r4]) * A[r*k1+1];+ u[n-3-k0*(s2+1)-r4] = (w[n-3-k0*s2-r4] - w[n-3-k0*(s2+1)-r4]) * A[r*k1]+ + (w[n-1-k0*s2-r4] - w[n-1-k0*(s2+1)-r4]) * A[r*k1+1];+ }+ }+ if (l+1 < ld-3) {+ // paper bug: ping-ponging of u&w here is omitted+ memcpy(w, u, sizeof(u));+ }+ }++ // step 4+ for (i=0; i < n8; ++i) {+ int j = bit_reverse(i) >> (32-ld+3);+ assert(j < n8);+ if (i == j) {+ // paper bug: original code probably swapped in place; if copying,+ // need to directly copy in this case+ int i8 = i << 3;+ v[i8+1] = u[i8+1];+ v[i8+3] = u[i8+3];+ v[i8+5] = u[i8+5];+ v[i8+7] = u[i8+7];+ } else if (i < j) {+ int i8 = i << 3, j8 = j << 3;+ v[j8+1] = u[i8+1], v[i8+1] = u[j8 + 1];+ v[j8+3] = u[i8+3], v[i8+3] = u[j8 + 3];+ v[j8+5] = u[i8+5], v[i8+5] = u[j8 + 5];+ v[j8+7] = u[i8+7], v[i8+7] = u[j8 + 7];+ }+ }+ // step 5+ for (k=0; k < n2; ++k) {+ w[k] = v[k*2+1];+ }+ // step 6+ for (k=k2=k4=0; k < n8; ++k, k2 += 2, k4 += 4) {+ u[n-1-k2] = w[k4];+ u[n-2-k2] = w[k4+1];+ u[n3_4 - 1 - k2] = w[k4+2];+ u[n3_4 - 2 - k2] = w[k4+3];+ }+ // step 7+ for (k=k2=0; k < n8; ++k, k2 += 2) {+ v[n2 + k2 ] = ( u[n2 + k2] + u[n-2-k2] + C[k2+1]*(u[n2+k2]-u[n-2-k2]) + C[k2]*(u[n2+k2+1]+u[n-2-k2+1]))/2;+ v[n-2 - k2] = ( u[n2 + k2] + u[n-2-k2] - C[k2+1]*(u[n2+k2]-u[n-2-k2]) - C[k2]*(u[n2+k2+1]+u[n-2-k2+1]))/2;+ v[n2+1+ k2] = ( u[n2+1+k2] - u[n-1-k2] + C[k2+1]*(u[n2+1+k2]+u[n-1-k2]) - C[k2]*(u[n2+k2]-u[n-2-k2]))/2;+ v[n-1 - k2] = (-u[n2+1+k2] + u[n-1-k2] + C[k2+1]*(u[n2+1+k2]+u[n-1-k2]) - C[k2]*(u[n2+k2]-u[n-2-k2]))/2;+ }+ // step 8+ for (k=k2=0; k < n4; ++k,k2 += 2) {+ X[k] = v[k2+n2]*B[k2 ] + v[k2+1+n2]*B[k2+1];+ X[n2-1-k] = v[k2+n2]*B[k2+1] - v[k2+1+n2]*B[k2 ];+ }++ // decode kernel to output+ // determined the following value experimentally+ // (by first figuring out what made inverse_mdct_slow work); then matching that here+ // (probably vorbis encoder premultiplies by n or n/2, to save it on the decoder?)+ s = 0.5; // theoretically would be n4++ // [[[ note! the s value of 0.5 is compensated for by the B[] in the current code,+ // so it needs to use the "old" B values to behave correctly, or else+ // set s to 1.0 ]]]+ for (i=0; i < n4 ; ++i) buffer[i] = s * X[i+n4];+ for ( ; i < n3_4; ++i) buffer[i] = -s * X[n3_4 - i - 1];+ for ( ; i < n ; ++i) buffer[i] = -s * X[i - n3_4];+}+#endif++static float *get_window(vorb *f, int len)+{+ len <<= 1;+ if (len == f->blocksize_0) return f->window[0];+ if (len == f->blocksize_1) return f->window[1];+ assert(0);+ return NULL;+}++#ifndef STB_VORBIS_NO_DEFER_FLOOR+typedef int16 YTYPE;+#else+typedef int YTYPE;+#endif+static int do_floor(vorb *f, Mapping *map, int i, int n, float *target, YTYPE *finalY, uint8 *step2_flag)+{+ int n2 = n >> 1;+ int s = map->chan[i].mux, floor;+ floor = map->submap_floor[s];+ if (f->floor_types[floor] == 0) {+ return error(f, VORBIS_invalid_stream);+ } else {+ Floor1 *g = &f->floor_config[floor].floor1;+ int j,q;+ int lx = 0, ly = finalY[0] * g->floor1_multiplier;+ for (q=1; q < g->values; ++q) {+ j = g->sorted_order[q];+ #ifndef STB_VORBIS_NO_DEFER_FLOOR+ if (finalY[j] >= 0)+ #else+ if (step2_flag[j])+ #endif+ {+ int hy = finalY[j] * g->floor1_multiplier;+ int hx = g->Xlist[j];+ if (lx != hx)+ draw_line(target, lx,ly, hx,hy, n2);+ CHECK(f);+ lx = hx, ly = hy;+ }+ }+ if (lx < n2) {+ // optimization of: draw_line(target, lx,ly, n,ly, n2);+ for (j=lx; j < n2; ++j)+ LINE_OP(target[j], inverse_db_table[ly]);+ CHECK(f);+ }+ }+ return TRUE;+}++// The meaning of "left" and "right"+//+// For a given frame:+// we compute samples from 0..n+// window_center is n/2+// we'll window and mix the samples from left_start to left_end with data from the previous frame+// all of the samples from left_end to right_start can be output without mixing; however,+// this interval is 0-length except when transitioning between short and long frames+// all of the samples from right_start to right_end need to be mixed with the next frame,+// which we don't have, so those get saved in a buffer+// frame N's right_end-right_start, the number of samples to mix with the next frame,+// has to be the same as frame N+1's left_end-left_start (which they are by+// construction)++static int vorbis_decode_initial(vorb *f, int *p_left_start, int *p_left_end, int *p_right_start, int *p_right_end, int *mode)+{+ Mode *m;+ int i, n, prev, next, window_center;+ f->channel_buffer_start = f->channel_buffer_end = 0;++ retry:+ if (f->eof) return FALSE;+ if (!maybe_start_packet(f))+ return FALSE;+ // check packet type+ if (get_bits(f,1) != 0) {+ if (IS_PUSH_MODE(f))+ return error(f,VORBIS_bad_packet_type);+ while (EOP != get8_packet(f));+ goto retry;+ }++ if (f->alloc.alloc_buffer)+ assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);++ i = get_bits(f, ilog(f->mode_count-1));+ if (i == EOP) return FALSE;+ if (i >= f->mode_count) return FALSE;+ *mode = i;+ m = f->mode_config + i;+ if (m->blockflag) {+ n = f->blocksize_1;+ prev = get_bits(f,1);+ next = get_bits(f,1);+ } else {+ prev = next = 0;+ n = f->blocksize_0;+ }++// WINDOWING++ window_center = n >> 1;+ if (m->blockflag && !prev) {+ *p_left_start = (n - f->blocksize_0) >> 2;+ *p_left_end = (n + f->blocksize_0) >> 2;+ } else {+ *p_left_start = 0;+ *p_left_end = window_center;+ }+ if (m->blockflag && !next) {+ *p_right_start = (n*3 - f->blocksize_0) >> 2;+ *p_right_end = (n*3 + f->blocksize_0) >> 2;+ } else {+ *p_right_start = window_center;+ *p_right_end = n;+ }++ return TRUE;+}++static int vorbis_decode_packet_rest(vorb *f, int *len, Mode *m, int left_start, int left_end, int right_start, int right_end, int *p_left)+{+ Mapping *map;+ int i,j,k,n,n2;+ int zero_channel[256];+ int really_zero_channel[256];++// WINDOWING++ n = f->blocksize[m->blockflag];+ map = &f->mapping[m->mapping];++// FLOORS+ n2 = n >> 1;++ CHECK(f);++ for (i=0; i < f->channels; ++i) {+ int s = map->chan[i].mux, floor;+ zero_channel[i] = FALSE;+ floor = map->submap_floor[s];+ if (f->floor_types[floor] == 0) {+ return error(f, VORBIS_invalid_stream);+ } else {+ Floor1 *g = &f->floor_config[floor].floor1;+ if (get_bits(f, 1)) {+ short *finalY;+ uint8 step2_flag[256];+ static int range_list[4] = { 256, 128, 86, 64 };+ int range = range_list[g->floor1_multiplier-1];+ int offset = 2;+ finalY = f->finalY[i];+ finalY[0] = get_bits(f, ilog(range)-1);+ finalY[1] = get_bits(f, ilog(range)-1);+ for (j=0; j < g->partitions; ++j) {+ int pclass = g->partition_class_list[j];+ int cdim = g->class_dimensions[pclass];+ int cbits = g->class_subclasses[pclass];+ int csub = (1 << cbits)-1;+ int cval = 0;+ if (cbits) {+ Codebook *c = f->codebooks + g->class_masterbooks[pclass];+ DECODE(cval,f,c);+ }+ for (k=0; k < cdim; ++k) {+ int book = g->subclass_books[pclass][cval & csub];+ cval = cval >> cbits;+ if (book >= 0) {+ int temp;+ Codebook *c = f->codebooks + book;+ DECODE(temp,f,c);+ finalY[offset++] = temp;+ } else+ finalY[offset++] = 0;+ }+ }+ if (f->valid_bits == INVALID_BITS) goto error; // behavior according to spec+ step2_flag[0] = step2_flag[1] = 1;+ for (j=2; j < g->values; ++j) {+ int low, high, pred, highroom, lowroom, room, val;+ low = g->neighbors[j][0];+ high = g->neighbors[j][1];+ //neighbors(g->Xlist, j, &low, &high);+ pred = predict_point(g->Xlist[j], g->Xlist[low], g->Xlist[high], finalY[low], finalY[high]);+ val = finalY[j];+ highroom = range - pred;+ lowroom = pred;+ if (highroom < lowroom)+ room = highroom * 2;+ else+ room = lowroom * 2;+ if (val) {+ step2_flag[low] = step2_flag[high] = 1;+ step2_flag[j] = 1;+ if (val >= room)+ if (highroom > lowroom)+ finalY[j] = val - lowroom + pred;+ else+ finalY[j] = pred - val + highroom - 1;+ else+ if (val & 1)+ finalY[j] = pred - ((val+1)>>1);+ else+ finalY[j] = pred + (val>>1);+ } else {+ step2_flag[j] = 0;+ finalY[j] = pred;+ }+ }++#ifdef STB_VORBIS_NO_DEFER_FLOOR+ do_floor(f, map, i, n, f->floor_buffers[i], finalY, step2_flag);+#else+ // defer final floor computation until _after_ residue+ for (j=0; j < g->values; ++j) {+ if (!step2_flag[j])+ finalY[j] = -1;+ }+#endif+ } else {+ error:+ zero_channel[i] = TRUE;+ }+ // So we just defer everything else to later++ // at this point we've decoded the floor into buffer+ }+ }+ CHECK(f);+ // at this point we've decoded all floors++ if (f->alloc.alloc_buffer)+ assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);++ // re-enable coupled channels if necessary+ memcpy(really_zero_channel, zero_channel, sizeof(really_zero_channel[0]) * f->channels);+ for (i=0; i < map->coupling_steps; ++i)+ if (!zero_channel[map->chan[i].magnitude] || !zero_channel[map->chan[i].angle]) {+ zero_channel[map->chan[i].magnitude] = zero_channel[map->chan[i].angle] = FALSE;+ }++ CHECK(f);+// RESIDUE DECODE+ for (i=0; i < map->submaps; ++i) {+ float *residue_buffers[STB_VORBIS_MAX_CHANNELS];+ int r;+ uint8 do_not_decode[256];+ int ch = 0;+ for (j=0; j < f->channels; ++j) {+ if (map->chan[j].mux == i) {+ if (zero_channel[j]) {+ do_not_decode[ch] = TRUE;+ residue_buffers[ch] = NULL;+ } else {+ do_not_decode[ch] = FALSE;+ residue_buffers[ch] = f->channel_buffers[j];+ }+ ++ch;+ }+ }+ r = map->submap_residue[i];+ decode_residue(f, residue_buffers, ch, n2, r, do_not_decode);+ }++ if (f->alloc.alloc_buffer)+ assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);+ CHECK(f);++// INVERSE COUPLING+ for (i = map->coupling_steps-1; i >= 0; --i) {+ int n2 = n >> 1;+ float *m = f->channel_buffers[map->chan[i].magnitude];+ float *a = f->channel_buffers[map->chan[i].angle ];+ for (j=0; j < n2; ++j) {+ float a2,m2;+ if (m[j] > 0)+ if (a[j] > 0)+ m2 = m[j], a2 = m[j] - a[j];+ else+ a2 = m[j], m2 = m[j] + a[j];+ else+ if (a[j] > 0)+ m2 = m[j], a2 = m[j] + a[j];+ else+ a2 = m[j], m2 = m[j] - a[j];+ m[j] = m2;+ a[j] = a2;+ }+ }+ CHECK(f);++ // finish decoding the floors+#ifndef STB_VORBIS_NO_DEFER_FLOOR+ for (i=0; i < f->channels; ++i) {+ if (really_zero_channel[i]) {+ memset(f->channel_buffers[i], 0, sizeof(*f->channel_buffers[i]) * n2);+ } else {+ do_floor(f, map, i, n, f->channel_buffers[i], f->finalY[i], NULL);+ }+ }+#else+ for (i=0; i < f->channels; ++i) {+ if (really_zero_channel[i]) {+ memset(f->channel_buffers[i], 0, sizeof(*f->channel_buffers[i]) * n2);+ } else {+ for (j=0; j < n2; ++j)+ f->channel_buffers[i][j] *= f->floor_buffers[i][j];+ }+ }+#endif++// INVERSE MDCT+ CHECK(f);+ for (i=0; i < f->channels; ++i)+ inverse_mdct(f->channel_buffers[i], n, f, m->blockflag);+ CHECK(f);++ // this shouldn't be necessary, unless we exited on an error+ // and want to flush to get to the next packet+ flush_packet(f);++ if (f->first_decode) {+ // assume we start so first non-discarded sample is sample 0+ // this isn't to spec, but spec would require us to read ahead+ // and decode the size of all current frames--could be done,+ // but presumably it's not a commonly used feature+ f->current_loc = -n2; // start of first frame is positioned for discard+ // we might have to discard samples "from" the next frame too,+ // if we're lapping a large block then a small at the start?+ f->discard_samples_deferred = n - right_end;+ f->current_loc_valid = TRUE;+ f->first_decode = FALSE;+ } else if (f->discard_samples_deferred) {+ if (f->discard_samples_deferred >= right_start - left_start) {+ f->discard_samples_deferred -= (right_start - left_start);+ left_start = right_start;+ *p_left = left_start;+ } else {+ left_start += f->discard_samples_deferred;+ *p_left = left_start;+ f->discard_samples_deferred = 0;+ }+ } else if (f->previous_length == 0 && f->current_loc_valid) {+ // we're recovering from a seek... that means we're going to discard+ // the samples from this packet even though we know our position from+ // the last page header, so we need to update the position based on+ // the discarded samples here+ // but wait, the code below is going to add this in itself even+ // on a discard, so we don't need to do it here...+ }++ // check if we have ogg information about the sample # for this packet+ if (f->last_seg_which == f->end_seg_with_known_loc) {+ // if we have a valid current loc, and this is final:+ if (f->current_loc_valid && (f->page_flag & PAGEFLAG_last_page)) {+ uint32 current_end = f->known_loc_for_packet;+ // then let's infer the size of the (probably) short final frame+ if (current_end < f->current_loc + (right_end-left_start)) {+ if (current_end < f->current_loc) {+ // negative truncation, that's impossible!+ *len = 0;+ } else {+ *len = current_end - f->current_loc;+ }+ *len += left_start; // this doesn't seem right, but has no ill effect on my test files+ if (*len > right_end) *len = right_end; // this should never happen+ f->current_loc += *len;+ return TRUE;+ }+ }+ // otherwise, just set our sample loc+ // guess that the ogg granule pos refers to the _middle_ of the+ // last frame?+ // set f->current_loc to the position of left_start+ f->current_loc = f->known_loc_for_packet - (n2-left_start);+ f->current_loc_valid = TRUE;+ }+ if (f->current_loc_valid)+ f->current_loc += (right_start - left_start);++ if (f->alloc.alloc_buffer)+ assert(f->alloc.alloc_buffer_length_in_bytes == f->temp_offset);+ *len = right_end; // ignore samples after the window goes to 0+ CHECK(f);++ return TRUE;+}++static int vorbis_decode_packet(vorb *f, int *len, int *p_left, int *p_right)+{+ int mode, left_end, right_end;+ if (!vorbis_decode_initial(f, p_left, &left_end, p_right, &right_end, &mode)) return 0;+ return vorbis_decode_packet_rest(f, len, f->mode_config + mode, *p_left, left_end, *p_right, right_end, p_left);+}++static int vorbis_finish_frame(stb_vorbis *f, int len, int left, int right)+{+ int prev,i,j;+ // we use right&left (the start of the right- and left-window sin()-regions)+ // to determine how much to return, rather than inferring from the rules+ // (same result, clearer code); 'left' indicates where our sin() window+ // starts, therefore where the previous window's right edge starts, and+ // therefore where to start mixing from the previous buffer. 'right'+ // indicates where our sin() ending-window starts, therefore that's where+ // we start saving, and where our returned-data ends.++ // mixin from previous window+ if (f->previous_length) {+ int i,j, n = f->previous_length;+ float *w = get_window(f, n);+ for (i=0; i < f->channels; ++i) {+ for (j=0; j < n; ++j)+ f->channel_buffers[i][left+j] =+ f->channel_buffers[i][left+j]*w[ j] ++ f->previous_window[i][ j]*w[n-1-j];+ }+ }++ prev = f->previous_length;++ // last half of this data becomes previous window+ f->previous_length = len - right;++ // @OPTIMIZE: could avoid this copy by double-buffering the+ // output (flipping previous_window with channel_buffers), but+ // then previous_window would have to be 2x as large, and+ // channel_buffers couldn't be temp mem (although they're NOT+ // currently temp mem, they could be (unless we want to level+ // performance by spreading out the computation))+ for (i=0; i < f->channels; ++i)+ for (j=0; right+j < len; ++j)+ f->previous_window[i][j] = f->channel_buffers[i][right+j];++ if (!prev)+ // there was no previous packet, so this data isn't valid...+ // this isn't entirely true, only the would-have-overlapped data+ // isn't valid, but this seems to be what the spec requires+ return 0;++ // truncate a short frame+ if (len < right) right = len;++ f->samples_output += right-left;++ return right - left;+}++static int vorbis_pump_first_frame(stb_vorbis *f)+{+ int len, right, left, res;+ res = vorbis_decode_packet(f, &len, &left, &right);+ if (res)+ vorbis_finish_frame(f, len, left, right);+ return res;+}++#ifndef STB_VORBIS_NO_PUSHDATA_API+static int is_whole_packet_present(stb_vorbis *f, int end_page)+{+ // make sure that we have the packet available before continuing...+ // this requires a full ogg parse, but we know we can fetch from f->stream++ // instead of coding this out explicitly, we could save the current read state,+ // read the next packet with get8() until end-of-packet, check f->eof, then+ // reset the state? but that would be slower, esp. since we'd have over 256 bytes+ // of state to restore (primarily the page segment table)++ int s = f->next_seg, first = TRUE;+ uint8 *p = f->stream;++ if (s != -1) { // if we're not starting the packet with a 'continue on next page' flag+ for (; s < f->segment_count; ++s) {+ p += f->segments[s];+ if (f->segments[s] < 255) // stop at first short segment+ break;+ }+ // either this continues, or it ends it...+ if (end_page)+ if (s < f->segment_count-1) return error(f, VORBIS_invalid_stream);+ if (s == f->segment_count)+ s = -1; // set 'crosses page' flag+ if (p > f->stream_end) return error(f, VORBIS_need_more_data);+ first = FALSE;+ }+ for (; s == -1;) {+ uint8 *q; + int n;++ // check that we have the page header ready+ if (p + 26 >= f->stream_end) return error(f, VORBIS_need_more_data);+ // validate the page+ if (memcmp(p, ogg_page_header, 4)) return error(f, VORBIS_invalid_stream);+ if (p[4] != 0) return error(f, VORBIS_invalid_stream);+ if (first) { // the first segment must NOT have 'continued_packet', later ones MUST+ if (f->previous_length)+ if ((p[5] & PAGEFLAG_continued_packet)) return error(f, VORBIS_invalid_stream);+ // if no previous length, we're resynching, so we can come in on a continued-packet,+ // which we'll just drop+ } else {+ if (!(p[5] & PAGEFLAG_continued_packet)) return error(f, VORBIS_invalid_stream);+ }+ n = p[26]; // segment counts+ q = p+27; // q points to segment table+ p = q + n; // advance past header+ // make sure we've read the segment table+ if (p > f->stream_end) return error(f, VORBIS_need_more_data);+ for (s=0; s < n; ++s) {+ p += q[s];+ if (q[s] < 255)+ break;+ }+ if (end_page)+ if (s < n-1) return error(f, VORBIS_invalid_stream);+ if (s == n)+ s = -1; // set 'crosses page' flag+ if (p > f->stream_end) return error(f, VORBIS_need_more_data);+ first = FALSE;+ }+ return TRUE;+}+#endif // !STB_VORBIS_NO_PUSHDATA_API++static int start_decoder(vorb *f)+{+ uint8 header[6], x,y;+ int len,i,j,k, max_submaps = 0;+ int longest_floorlist=0;++ // first page, first packet++ if (!start_page(f)) return FALSE;+ // validate page flag+ if (!(f->page_flag & PAGEFLAG_first_page)) return error(f, VORBIS_invalid_first_page);+ if (f->page_flag & PAGEFLAG_last_page) return error(f, VORBIS_invalid_first_page);+ if (f->page_flag & PAGEFLAG_continued_packet) return error(f, VORBIS_invalid_first_page);+ // check for expected packet length+ if (f->segment_count != 1) return error(f, VORBIS_invalid_first_page);+ if (f->segments[0] != 30) return error(f, VORBIS_invalid_first_page);+ // read packet+ // check packet header+ if (get8(f) != VORBIS_packet_id) return error(f, VORBIS_invalid_first_page);+ if (!getn(f, header, 6)) return error(f, VORBIS_unexpected_eof);+ if (!vorbis_validate(header)) return error(f, VORBIS_invalid_first_page);+ // vorbis_version+ if (get32(f) != 0) return error(f, VORBIS_invalid_first_page);+ f->channels = get8(f); if (!f->channels) return error(f, VORBIS_invalid_first_page);+ if (f->channels > STB_VORBIS_MAX_CHANNELS) return error(f, VORBIS_too_many_channels);+ f->sample_rate = get32(f); if (!f->sample_rate) return error(f, VORBIS_invalid_first_page);+ get32(f); // bitrate_maximum+ get32(f); // bitrate_nominal+ get32(f); // bitrate_minimum+ x = get8(f);+ {+ int log0,log1;+ log0 = x & 15;+ log1 = x >> 4;+ f->blocksize_0 = 1 << log0;+ f->blocksize_1 = 1 << log1;+ if (log0 < 6 || log0 > 13) return error(f, VORBIS_invalid_setup);+ if (log1 < 6 || log1 > 13) return error(f, VORBIS_invalid_setup);+ if (log0 > log1) return error(f, VORBIS_invalid_setup);+ }++ // framing_flag+ x = get8(f);+ if (!(x & 1)) return error(f, VORBIS_invalid_first_page);++ // second packet!+ if (!start_page(f)) return FALSE;++ if (!start_packet(f)) return FALSE;+ do {+ len = next_segment(f);+ skip(f, len);+ f->bytes_in_seg = 0;+ } while (len);++ // third packet!+ if (!start_packet(f)) return FALSE;++ #ifndef STB_VORBIS_NO_PUSHDATA_API+ if (IS_PUSH_MODE(f)) {+ if (!is_whole_packet_present(f, TRUE)) {+ // convert error in ogg header to write type+ if (f->error == VORBIS_invalid_stream)+ f->error = VORBIS_invalid_setup;+ return FALSE;+ }+ }+ #endif++ crc32_init(); // always init it, to avoid multithread race conditions++ if (get8_packet(f) != VORBIS_packet_setup) return error(f, VORBIS_invalid_setup);+ for (i=0; i < 6; ++i) header[i] = get8_packet(f);+ if (!vorbis_validate(header)) return error(f, VORBIS_invalid_setup);++ // codebooks++ f->codebook_count = get_bits(f,8) + 1;+ f->codebooks = (Codebook *) setup_malloc(f, sizeof(*f->codebooks) * f->codebook_count);+ if (f->codebooks == NULL) return error(f, VORBIS_outofmem);+ memset(f->codebooks, 0, sizeof(*f->codebooks) * f->codebook_count);+ for (i=0; i < f->codebook_count; ++i) {+ uint32 *values;+ int ordered, sorted_count;+ int total=0;+ uint8 *lengths;+ Codebook *c = f->codebooks+i;+ CHECK(f);+ x = get_bits(f, 8); if (x != 0x42) return error(f, VORBIS_invalid_setup);+ x = get_bits(f, 8); if (x != 0x43) return error(f, VORBIS_invalid_setup);+ x = get_bits(f, 8); if (x != 0x56) return error(f, VORBIS_invalid_setup);+ x = get_bits(f, 8);+ c->dimensions = (get_bits(f, 8)<<8) + x;+ x = get_bits(f, 8);+ y = get_bits(f, 8);+ c->entries = (get_bits(f, 8)<<16) + (y<<8) + x;+ ordered = get_bits(f,1);+ c->sparse = ordered ? 0 : get_bits(f,1);++ if (c->dimensions == 0 && c->entries != 0) return error(f, VORBIS_invalid_setup);++ if (c->sparse)+ lengths = (uint8 *) setup_temp_malloc(f, c->entries);+ else+ lengths = c->codeword_lengths = (uint8 *) setup_malloc(f, c->entries);++ if (!lengths) return error(f, VORBIS_outofmem);++ if (ordered) {+ int current_entry = 0;+ int current_length = get_bits(f,5) + 1;+ while (current_entry < c->entries) {+ int limit = c->entries - current_entry;+ int n = get_bits(f, ilog(limit));+ if (current_entry + n > (int) c->entries) { return error(f, VORBIS_invalid_setup); }+ memset(lengths + current_entry, current_length, n);+ current_entry += n;+ ++current_length;+ }+ } else {+ for (j=0; j < c->entries; ++j) {+ int present = c->sparse ? get_bits(f,1) : 1;+ if (present) {+ lengths[j] = get_bits(f, 5) + 1;+ ++total;+ if (lengths[j] == 32)+ return error(f, VORBIS_invalid_setup);+ } else {+ lengths[j] = NO_CODE;+ }+ }+ }++ if (c->sparse && total >= c->entries >> 2) {+ // convert sparse items to non-sparse!+ if (c->entries > (int) f->setup_temp_memory_required)+ f->setup_temp_memory_required = c->entries;++ c->codeword_lengths = (uint8 *) setup_malloc(f, c->entries);+ if (c->codeword_lengths == NULL) return error(f, VORBIS_outofmem);+ memcpy(c->codeword_lengths, lengths, c->entries);+ setup_temp_free(f, lengths, c->entries); // note this is only safe if there have been no intervening temp mallocs!+ lengths = c->codeword_lengths;+ c->sparse = 0;+ }++ // compute the size of the sorted tables+ if (c->sparse) {+ sorted_count = total;+ } else {+ sorted_count = 0;+ #ifndef STB_VORBIS_NO_HUFFMAN_BINARY_SEARCH+ for (j=0; j < c->entries; ++j)+ if (lengths[j] > STB_VORBIS_FAST_HUFFMAN_LENGTH && lengths[j] != NO_CODE)+ ++sorted_count;+ #endif+ }++ c->sorted_entries = sorted_count;+ values = NULL;++ CHECK(f);+ if (!c->sparse) {+ c->codewords = (uint32 *) setup_malloc(f, sizeof(c->codewords[0]) * c->entries);+ if (!c->codewords) return error(f, VORBIS_outofmem);+ } else {+ unsigned int size;+ if (c->sorted_entries) {+ c->codeword_lengths = (uint8 *) setup_malloc(f, c->sorted_entries);+ if (!c->codeword_lengths) return error(f, VORBIS_outofmem);+ c->codewords = (uint32 *) setup_temp_malloc(f, sizeof(*c->codewords) * c->sorted_entries);+ if (!c->codewords) return error(f, VORBIS_outofmem);+ values = (uint32 *) setup_temp_malloc(f, sizeof(*values) * c->sorted_entries);+ if (!values) return error(f, VORBIS_outofmem);+ }+ size = c->entries + (sizeof(*c->codewords) + sizeof(*values)) * c->sorted_entries;+ if (size > f->setup_temp_memory_required)+ f->setup_temp_memory_required = size;+ }++ if (!compute_codewords(c, lengths, c->entries, values)) {+ if (c->sparse) setup_temp_free(f, values, 0);+ return error(f, VORBIS_invalid_setup);+ }++ if (c->sorted_entries) {+ // allocate an extra slot for sentinels+ c->sorted_codewords = (uint32 *) setup_malloc(f, sizeof(*c->sorted_codewords) * (c->sorted_entries+1));+ if (c->sorted_codewords == NULL) return error(f, VORBIS_outofmem);+ // allocate an extra slot at the front so that c->sorted_values[-1] is defined+ // so that we can catch that case without an extra if+ c->sorted_values = ( int *) setup_malloc(f, sizeof(*c->sorted_values ) * (c->sorted_entries+1));+ if (c->sorted_values == NULL) return error(f, VORBIS_outofmem);+ ++c->sorted_values;+ c->sorted_values[-1] = -1;+ compute_sorted_huffman(c, lengths, values);+ }++ if (c->sparse) {+ setup_temp_free(f, values, sizeof(*values)*c->sorted_entries);+ setup_temp_free(f, c->codewords, sizeof(*c->codewords)*c->sorted_entries);+ setup_temp_free(f, lengths, c->entries);+ c->codewords = NULL;+ }++ compute_accelerated_huffman(c);++ CHECK(f);+ c->lookup_type = get_bits(f, 4);+ if (c->lookup_type > 2) return error(f, VORBIS_invalid_setup);+ if (c->lookup_type > 0) {+ uint16 *mults;+ c->minimum_value = float32_unpack(get_bits(f, 32));+ c->delta_value = float32_unpack(get_bits(f, 32));+ c->value_bits = get_bits(f, 4)+1;+ c->sequence_p = get_bits(f,1);+ if (c->lookup_type == 1) {+ c->lookup_values = lookup1_values(c->entries, c->dimensions);+ } else {+ c->lookup_values = c->entries * c->dimensions;+ }+ if (c->lookup_values == 0) return error(f, VORBIS_invalid_setup);+ mults = (uint16 *) setup_temp_malloc(f, sizeof(mults[0]) * c->lookup_values);+ if (mults == NULL) return error(f, VORBIS_outofmem);+ for (j=0; j < (int) c->lookup_values; ++j) {+ int q = get_bits(f, c->value_bits);+ if (q == EOP) { setup_temp_free(f,mults,sizeof(mults[0])*c->lookup_values); return error(f, VORBIS_invalid_setup); }+ mults[j] = q;+ }++#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK+ if (c->lookup_type == 1) {+ int len, sparse = c->sparse;+ float last=0;+ // pre-expand the lookup1-style multiplicands, to avoid a divide in the inner loop+ if (sparse) {+ if (c->sorted_entries == 0) goto skip;+ c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->sorted_entries * c->dimensions);+ } else+ c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->entries * c->dimensions);+ if (c->multiplicands == NULL) { setup_temp_free(f,mults,sizeof(mults[0])*c->lookup_values); return error(f, VORBIS_outofmem); }+ len = sparse ? c->sorted_entries : c->entries;+ for (j=0; j < len; ++j) {+ unsigned int z = sparse ? c->sorted_values[j] : j;+ unsigned int div=1;+ for (k=0; k < c->dimensions; ++k) {+ int off = (z / div) % c->lookup_values;+ float val = mults[off];+ val = mults[off]*c->delta_value + c->minimum_value + last;+ c->multiplicands[j*c->dimensions + k] = val;+ if (c->sequence_p)+ last = val;+ if (k+1 < c->dimensions) {+ if (div > UINT_MAX / (unsigned int) c->lookup_values) {+ setup_temp_free(f, mults,sizeof(mults[0])*c->lookup_values);+ return error(f, VORBIS_invalid_setup);+ }+ div *= c->lookup_values;+ }+ }+ }+ c->lookup_type = 2;+ }+ else+#endif+ {+ float last=0;+ CHECK(f);+ c->multiplicands = (codetype *) setup_malloc(f, sizeof(c->multiplicands[0]) * c->lookup_values);+ if (c->multiplicands == NULL) { setup_temp_free(f, mults,sizeof(mults[0])*c->lookup_values); return error(f, VORBIS_outofmem); }+ for (j=0; j < (int) c->lookup_values; ++j) {+ float val = mults[j] * c->delta_value + c->minimum_value + last;+ c->multiplicands[j] = val;+ if (c->sequence_p)+ last = val;+ }+ }+#ifndef STB_VORBIS_DIVIDES_IN_CODEBOOK+ skip:;+#endif+ setup_temp_free(f, mults, sizeof(mults[0])*c->lookup_values);++ CHECK(f);+ }+ CHECK(f);+ }++ // time domain transfers (notused)++ x = get_bits(f, 6) + 1;+ for (i=0; i < x; ++i) {+ uint32 z = get_bits(f, 16);+ if (z != 0) return error(f, VORBIS_invalid_setup);+ }++ // Floors+ f->floor_count = get_bits(f, 6)+1;+ f->floor_config = (Floor *) setup_malloc(f, f->floor_count * sizeof(*f->floor_config));+ if (f->floor_config == NULL) return error(f, VORBIS_outofmem);+ for (i=0; i < f->floor_count; ++i) {+ f->floor_types[i] = get_bits(f, 16);+ if (f->floor_types[i] > 1) return error(f, VORBIS_invalid_setup);+ if (f->floor_types[i] == 0) {+ Floor0 *g = &f->floor_config[i].floor0;+ g->order = get_bits(f,8);+ g->rate = get_bits(f,16);+ g->bark_map_size = get_bits(f,16);+ g->amplitude_bits = get_bits(f,6);+ g->amplitude_offset = get_bits(f,8);+ g->number_of_books = get_bits(f,4) + 1;+ for (j=0; j < g->number_of_books; ++j)+ g->book_list[j] = get_bits(f,8);+ return error(f, VORBIS_feature_not_supported);+ } else {+ stbv__floor_ordering p[31*8+2];+ Floor1 *g = &f->floor_config[i].floor1;+ int max_class = -1; + g->partitions = get_bits(f, 5);+ for (j=0; j < g->partitions; ++j) {+ g->partition_class_list[j] = get_bits(f, 4);+ if (g->partition_class_list[j] > max_class)+ max_class = g->partition_class_list[j];+ }+ for (j=0; j <= max_class; ++j) {+ g->class_dimensions[j] = get_bits(f, 3)+1;+ g->class_subclasses[j] = get_bits(f, 2);+ if (g->class_subclasses[j]) {+ g->class_masterbooks[j] = get_bits(f, 8);+ if (g->class_masterbooks[j] >= f->codebook_count) return error(f, VORBIS_invalid_setup);+ }+ for (k=0; k < 1 << g->class_subclasses[j]; ++k) {+ g->subclass_books[j][k] = get_bits(f,8)-1;+ if (g->subclass_books[j][k] >= f->codebook_count) return error(f, VORBIS_invalid_setup);+ }+ }+ g->floor1_multiplier = get_bits(f,2)+1;+ g->rangebits = get_bits(f,4);+ g->Xlist[0] = 0;+ g->Xlist[1] = 1 << g->rangebits;+ g->values = 2;+ for (j=0; j < g->partitions; ++j) {+ int c = g->partition_class_list[j];+ for (k=0; k < g->class_dimensions[c]; ++k) {+ g->Xlist[g->values] = get_bits(f, g->rangebits);+ ++g->values;+ }+ }+ // precompute the sorting+ for (j=0; j < g->values; ++j) {+ p[j].x = g->Xlist[j];+ p[j].id = j;+ }+ qsort(p, g->values, sizeof(p[0]), point_compare);+ for (j=0; j < g->values; ++j)+ g->sorted_order[j] = (uint8) p[j].id;+ // precompute the neighbors+ for (j=2; j < g->values; ++j) {+ int low,hi;+ neighbors(g->Xlist, j, &low,&hi);+ g->neighbors[j][0] = low;+ g->neighbors[j][1] = hi;+ }++ if (g->values > longest_floorlist)+ longest_floorlist = g->values;+ }+ }++ // Residue+ f->residue_count = get_bits(f, 6)+1;+ f->residue_config = (Residue *) setup_malloc(f, f->residue_count * sizeof(f->residue_config[0]));+ if (f->residue_config == NULL) return error(f, VORBIS_outofmem);+ memset(f->residue_config, 0, f->residue_count * sizeof(f->residue_config[0]));+ for (i=0; i < f->residue_count; ++i) {+ uint8 residue_cascade[64];+ Residue *r = f->residue_config+i;+ f->residue_types[i] = get_bits(f, 16);+ if (f->residue_types[i] > 2) return error(f, VORBIS_invalid_setup);+ r->begin = get_bits(f, 24);+ r->end = get_bits(f, 24);+ if (r->end < r->begin) return error(f, VORBIS_invalid_setup);+ r->part_size = get_bits(f,24)+1;+ r->classifications = get_bits(f,6)+1;+ r->classbook = get_bits(f,8);+ if (r->classbook >= f->codebook_count) return error(f, VORBIS_invalid_setup);+ for (j=0; j < r->classifications; ++j) {+ uint8 high_bits=0;+ uint8 low_bits=get_bits(f,3);+ if (get_bits(f,1))+ high_bits = get_bits(f,5);+ residue_cascade[j] = high_bits*8 + low_bits;+ }+ r->residue_books = (short (*)[8]) setup_malloc(f, sizeof(r->residue_books[0]) * r->classifications);+ if (r->residue_books == NULL) return error(f, VORBIS_outofmem);+ for (j=0; j < r->classifications; ++j) {+ for (k=0; k < 8; ++k) {+ if (residue_cascade[j] & (1 << k)) {+ r->residue_books[j][k] = get_bits(f, 8);+ if (r->residue_books[j][k] >= f->codebook_count) return error(f, VORBIS_invalid_setup);+ } else {+ r->residue_books[j][k] = -1;+ }+ }+ }+ // precompute the classifications[] array to avoid inner-loop mod/divide+ // call it 'classdata' since we already have r->classifications+ r->classdata = (uint8 **) setup_malloc(f, sizeof(*r->classdata) * f->codebooks[r->classbook].entries);+ if (!r->classdata) return error(f, VORBIS_outofmem);+ memset(r->classdata, 0, sizeof(*r->classdata) * f->codebooks[r->classbook].entries);+ for (j=0; j < f->codebooks[r->classbook].entries; ++j) {+ int classwords = f->codebooks[r->classbook].dimensions;+ int temp = j;+ r->classdata[j] = (uint8 *) setup_malloc(f, sizeof(r->classdata[j][0]) * classwords);+ if (r->classdata[j] == NULL) return error(f, VORBIS_outofmem);+ for (k=classwords-1; k >= 0; --k) {+ r->classdata[j][k] = temp % r->classifications;+ temp /= r->classifications;+ }+ }+ }++ f->mapping_count = get_bits(f,6)+1;+ f->mapping = (Mapping *) setup_malloc(f, f->mapping_count * sizeof(*f->mapping));+ if (f->mapping == NULL) return error(f, VORBIS_outofmem);+ memset(f->mapping, 0, f->mapping_count * sizeof(*f->mapping));+ for (i=0; i < f->mapping_count; ++i) {+ Mapping *m = f->mapping + i; + int mapping_type = get_bits(f,16);+ if (mapping_type != 0) return error(f, VORBIS_invalid_setup);+ m->chan = (MappingChannel *) setup_malloc(f, f->channels * sizeof(*m->chan));+ if (m->chan == NULL) return error(f, VORBIS_outofmem);+ if (get_bits(f,1))+ m->submaps = get_bits(f,4)+1;+ else+ m->submaps = 1;+ if (m->submaps > max_submaps)+ max_submaps = m->submaps;+ if (get_bits(f,1)) {+ m->coupling_steps = get_bits(f,8)+1;+ for (k=0; k < m->coupling_steps; ++k) {+ m->chan[k].magnitude = get_bits(f, ilog(f->channels-1));+ m->chan[k].angle = get_bits(f, ilog(f->channels-1));+ if (m->chan[k].magnitude >= f->channels) return error(f, VORBIS_invalid_setup);+ if (m->chan[k].angle >= f->channels) return error(f, VORBIS_invalid_setup);+ if (m->chan[k].magnitude == m->chan[k].angle) return error(f, VORBIS_invalid_setup);+ }+ } else+ m->coupling_steps = 0;++ // reserved field+ if (get_bits(f,2)) return error(f, VORBIS_invalid_setup);+ if (m->submaps > 1) {+ for (j=0; j < f->channels; ++j) {+ m->chan[j].mux = get_bits(f, 4);+ if (m->chan[j].mux >= m->submaps) return error(f, VORBIS_invalid_setup);+ }+ } else+ // @SPECIFICATION: this case is missing from the spec+ for (j=0; j < f->channels; ++j)+ m->chan[j].mux = 0;++ for (j=0; j < m->submaps; ++j) {+ get_bits(f,8); // discard+ m->submap_floor[j] = get_bits(f,8);+ m->submap_residue[j] = get_bits(f,8);+ if (m->submap_floor[j] >= f->floor_count) return error(f, VORBIS_invalid_setup);+ if (m->submap_residue[j] >= f->residue_count) return error(f, VORBIS_invalid_setup);+ }+ }++ // Modes+ f->mode_count = get_bits(f, 6)+1;+ for (i=0; i < f->mode_count; ++i) {+ Mode *m = f->mode_config+i;+ m->blockflag = get_bits(f,1);+ m->windowtype = get_bits(f,16);+ m->transformtype = get_bits(f,16);+ m->mapping = get_bits(f,8);+ if (m->windowtype != 0) return error(f, VORBIS_invalid_setup);+ if (m->transformtype != 0) return error(f, VORBIS_invalid_setup);+ if (m->mapping >= f->mapping_count) return error(f, VORBIS_invalid_setup);+ }++ flush_packet(f);++ f->previous_length = 0;++ for (i=0; i < f->channels; ++i) {+ f->channel_buffers[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1);+ f->previous_window[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1/2);+ f->finalY[i] = (int16 *) setup_malloc(f, sizeof(int16) * longest_floorlist);+ if (f->channel_buffers[i] == NULL || f->previous_window[i] == NULL || f->finalY[i] == NULL) return error(f, VORBIS_outofmem);+ memset(f->channel_buffers[i], 0, sizeof(float) * f->blocksize_1);+ #ifdef STB_VORBIS_NO_DEFER_FLOOR+ f->floor_buffers[i] = (float *) setup_malloc(f, sizeof(float) * f->blocksize_1/2);+ if (f->floor_buffers[i] == NULL) return error(f, VORBIS_outofmem);+ #endif+ }++ if (!init_blocksize(f, 0, f->blocksize_0)) return FALSE;+ if (!init_blocksize(f, 1, f->blocksize_1)) return FALSE;+ f->blocksize[0] = f->blocksize_0;+ f->blocksize[1] = f->blocksize_1;++#ifdef STB_VORBIS_DIVIDE_TABLE+ if (integer_divide_table[1][1]==0)+ for (i=0; i < DIVTAB_NUMER; ++i)+ for (j=1; j < DIVTAB_DENOM; ++j)+ integer_divide_table[i][j] = i / j;+#endif++ // compute how much temporary memory is needed++ // 1.+ {+ uint32 imdct_mem = (f->blocksize_1 * sizeof(float) >> 1);+ uint32 classify_mem;+ int i,max_part_read=0;+ for (i=0; i < f->residue_count; ++i) {+ Residue *r = f->residue_config + i;+ unsigned int actual_size = f->blocksize_1 / 2;+ unsigned int limit_r_begin = r->begin < actual_size ? r->begin : actual_size;+ unsigned int limit_r_end = r->end < actual_size ? r->end : actual_size;+ int n_read = limit_r_end - limit_r_begin;+ int part_read = n_read / r->part_size;+ if (part_read > max_part_read)+ max_part_read = part_read;+ }+ #ifndef STB_VORBIS_DIVIDES_IN_RESIDUE+ classify_mem = f->channels * (sizeof(void*) + max_part_read * sizeof(uint8 *));+ #else+ classify_mem = f->channels * (sizeof(void*) + max_part_read * sizeof(int *));+ #endif++ // maximum reasonable partition size is f->blocksize_1++ f->temp_memory_required = classify_mem;+ if (imdct_mem > f->temp_memory_required)+ f->temp_memory_required = imdct_mem;+ }++ f->first_decode = TRUE;++ if (f->alloc.alloc_buffer) {+ assert(f->temp_offset == f->alloc.alloc_buffer_length_in_bytes);+ // check if there's enough temp memory so we don't error later+ if (f->setup_offset + sizeof(*f) + f->temp_memory_required > (unsigned) f->temp_offset)+ return error(f, VORBIS_outofmem);+ }++ f->first_audio_page_offset = stb_vorbis_get_file_offset(f);++ return TRUE;+}++static void vorbis_deinit(stb_vorbis *p)+{+ int i,j;+ if (p->residue_config) {+ for (i=0; i < p->residue_count; ++i) {+ Residue *r = p->residue_config+i;+ if (r->classdata) {+ for (j=0; j < p->codebooks[r->classbook].entries; ++j)+ setup_free(p, r->classdata[j]);+ setup_free(p, r->classdata);+ }+ setup_free(p, r->residue_books);+ }+ }++ if (p->codebooks) {+ CHECK(p);+ for (i=0; i < p->codebook_count; ++i) {+ Codebook *c = p->codebooks + i;+ setup_free(p, c->codeword_lengths);+ setup_free(p, c->multiplicands);+ setup_free(p, c->codewords);+ setup_free(p, c->sorted_codewords);+ // c->sorted_values[-1] is the first entry in the array+ setup_free(p, c->sorted_values ? c->sorted_values-1 : NULL);+ }+ setup_free(p, p->codebooks);+ }+ setup_free(p, p->floor_config);+ setup_free(p, p->residue_config);+ if (p->mapping) {+ for (i=0; i < p->mapping_count; ++i)+ setup_free(p, p->mapping[i].chan);+ setup_free(p, p->mapping);+ }+ CHECK(p);+ for (i=0; i < p->channels && i < STB_VORBIS_MAX_CHANNELS; ++i) {+ setup_free(p, p->channel_buffers[i]);+ setup_free(p, p->previous_window[i]);+ #ifdef STB_VORBIS_NO_DEFER_FLOOR+ setup_free(p, p->floor_buffers[i]);+ #endif+ setup_free(p, p->finalY[i]);+ }+ for (i=0; i < 2; ++i) {+ setup_free(p, p->A[i]);+ setup_free(p, p->B[i]);+ setup_free(p, p->C[i]);+ setup_free(p, p->window[i]);+ setup_free(p, p->bit_reverse[i]);+ }+ #ifndef STB_VORBIS_NO_STDIO+ if (p->close_on_free) fclose(p->f);+ #endif+}++void stb_vorbis_close(stb_vorbis *p)+{+ if (p == NULL) return;+ vorbis_deinit(p);+ setup_free(p,p);+}++static void vorbis_init(stb_vorbis *p, const stb_vorbis_alloc *z)+{+ memset(p, 0, sizeof(*p)); // NULL out all malloc'd pointers to start+ if (z) {+ p->alloc = *z;+ p->alloc.alloc_buffer_length_in_bytes = (p->alloc.alloc_buffer_length_in_bytes+3) & ~3;+ p->temp_offset = p->alloc.alloc_buffer_length_in_bytes;+ }+ p->eof = 0;+ p->error = VORBIS__no_error;+ p->stream = NULL;+ p->codebooks = NULL;+ p->page_crc_tests = -1;+ #ifndef STB_VORBIS_NO_STDIO+ p->close_on_free = FALSE;+ p->f = NULL;+ #endif+}++int stb_vorbis_get_sample_offset(stb_vorbis *f)+{+ if (f->current_loc_valid)+ return f->current_loc;+ else+ return -1;+}++stb_vorbis_info stb_vorbis_get_info(stb_vorbis *f)+{+ stb_vorbis_info d;+ d.channels = f->channels;+ d.sample_rate = f->sample_rate;+ d.setup_memory_required = f->setup_memory_required;+ d.setup_temp_memory_required = f->setup_temp_memory_required;+ d.temp_memory_required = f->temp_memory_required;+ d.max_frame_size = f->blocksize_1 >> 1;+ return d;+}++int stb_vorbis_get_error(stb_vorbis *f)+{+ int e = f->error;+ f->error = VORBIS__no_error;+ return e;+}++static stb_vorbis * vorbis_alloc(stb_vorbis *f)+{+ stb_vorbis *p = (stb_vorbis *) setup_malloc(f, sizeof(*p));+ return p;+}++#ifndef STB_VORBIS_NO_PUSHDATA_API++void stb_vorbis_flush_pushdata(stb_vorbis *f)+{+ f->previous_length = 0;+ f->page_crc_tests = 0;+ f->discard_samples_deferred = 0;+ f->current_loc_valid = FALSE;+ f->first_decode = FALSE;+ f->samples_output = 0;+ f->channel_buffer_start = 0;+ f->channel_buffer_end = 0;+}++static int vorbis_search_for_page_pushdata(vorb *f, uint8 *data, int data_len)+{+ int i,n;+ for (i=0; i < f->page_crc_tests; ++i)+ f->scan[i].bytes_done = 0;++ // if we have room for more scans, search for them first, because+ // they may cause us to stop early if their header is incomplete+ if (f->page_crc_tests < STB_VORBIS_PUSHDATA_CRC_COUNT) {+ if (data_len < 4) return 0;+ data_len -= 3; // need to look for 4-byte sequence, so don't miss+ // one that straddles a boundary+ for (i=0; i < data_len; ++i) {+ if (data[i] == 0x4f) {+ if (0==memcmp(data+i, ogg_page_header, 4)) {+ int j,len;+ uint32 crc;+ // make sure we have the whole page header+ if (i+26 >= data_len || i+27+data[i+26] >= data_len) {+ // only read up to this page start, so hopefully we'll+ // have the whole page header start next time+ data_len = i;+ break;+ }+ // ok, we have it all; compute the length of the page+ len = 27 + data[i+26];+ for (j=0; j < data[i+26]; ++j)+ len += data[i+27+j];+ // scan everything up to the embedded crc (which we must 0)+ crc = 0;+ for (j=0; j < 22; ++j)+ crc = crc32_update(crc, data[i+j]);+ // now process 4 0-bytes+ for ( ; j < 26; ++j)+ crc = crc32_update(crc, 0);+ // len is the total number of bytes we need to scan+ n = f->page_crc_tests++;+ f->scan[n].bytes_left = len-j;+ f->scan[n].crc_so_far = crc;+ f->scan[n].goal_crc = data[i+22] + (data[i+23] << 8) + (data[i+24]<<16) + (data[i+25]<<24);+ // if the last frame on a page is continued to the next, then+ // we can't recover the sample_loc immediately+ if (data[i+27+data[i+26]-1] == 255)+ f->scan[n].sample_loc = ~0;+ else+ f->scan[n].sample_loc = data[i+6] + (data[i+7] << 8) + (data[i+ 8]<<16) + (data[i+ 9]<<24);+ f->scan[n].bytes_done = i+j;+ if (f->page_crc_tests == STB_VORBIS_PUSHDATA_CRC_COUNT)+ break;+ // keep going if we still have room for more+ }+ }+ }+ }++ for (i=0; i < f->page_crc_tests;) {+ uint32 crc;+ int j;+ int n = f->scan[i].bytes_done;+ int m = f->scan[i].bytes_left;+ if (m > data_len - n) m = data_len - n;+ // m is the bytes to scan in the current chunk+ crc = f->scan[i].crc_so_far;+ for (j=0; j < m; ++j)+ crc = crc32_update(crc, data[n+j]);+ f->scan[i].bytes_left -= m;+ f->scan[i].crc_so_far = crc;+ if (f->scan[i].bytes_left == 0) {+ // does it match?+ if (f->scan[i].crc_so_far == f->scan[i].goal_crc) {+ // Houston, we have page+ data_len = n+m; // consumption amount is wherever that scan ended+ f->page_crc_tests = -1; // drop out of page scan mode+ f->previous_length = 0; // decode-but-don't-output one frame+ f->next_seg = -1; // start a new page+ f->current_loc = f->scan[i].sample_loc; // set the current sample location+ // to the amount we'd have decoded had we decoded this page+ f->current_loc_valid = f->current_loc != ~0U;+ return data_len;+ }+ // delete entry+ f->scan[i] = f->scan[--f->page_crc_tests];+ } else {+ ++i;+ }+ }++ return data_len;+}++// return value: number of bytes we used+int stb_vorbis_decode_frame_pushdata(+ stb_vorbis *f, // the file we're decoding+ const uint8 *data, int data_len, // the memory available for decoding+ int *channels, // place to write number of float * buffers+ float ***output, // place to write float ** array of float * buffers+ int *samples // place to write number of output samples+ )+{+ int i;+ int len,right,left;++ if (!IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing);++ if (f->page_crc_tests >= 0) {+ *samples = 0;+ return vorbis_search_for_page_pushdata(f, (uint8 *) data, data_len);+ }++ f->stream = (uint8 *) data;+ f->stream_end = (uint8 *) data + data_len;+ f->error = VORBIS__no_error;++ // check that we have the entire packet in memory+ if (!is_whole_packet_present(f, FALSE)) {+ *samples = 0;+ return 0;+ }++ if (!vorbis_decode_packet(f, &len, &left, &right)) {+ // save the actual error we encountered+ enum STBVorbisError error = f->error;+ if (error == VORBIS_bad_packet_type) {+ // flush and resynch+ f->error = VORBIS__no_error;+ while (get8_packet(f) != EOP)+ if (f->eof) break;+ *samples = 0;+ return (int) (f->stream - data);+ }+ if (error == VORBIS_continued_packet_flag_invalid) {+ if (f->previous_length == 0) {+ // we may be resynching, in which case it's ok to hit one+ // of these; just discard the packet+ f->error = VORBIS__no_error;+ while (get8_packet(f) != EOP)+ if (f->eof) break;+ *samples = 0;+ return (int) (f->stream - data);+ }+ }+ // if we get an error while parsing, what to do?+ // well, it DEFINITELY won't work to continue from where we are!+ stb_vorbis_flush_pushdata(f);+ // restore the error that actually made us bail+ f->error = error;+ *samples = 0;+ return 1;+ }++ // success!+ len = vorbis_finish_frame(f, len, left, right);+ for (i=0; i < f->channels; ++i)+ f->outputs[i] = f->channel_buffers[i] + left;++ if (channels) *channels = f->channels;+ *samples = len;+ *output = f->outputs;+ return (int) (f->stream - data);+}++stb_vorbis *stb_vorbis_open_pushdata(+ const unsigned char *data, int data_len, // the memory available for decoding+ int *data_used, // only defined if result is not NULL+ int *error, const stb_vorbis_alloc *alloc)+{+ stb_vorbis *f, p;+ vorbis_init(&p, alloc);+ p.stream = (uint8 *) data;+ p.stream_end = (uint8 *) data + data_len;+ p.push_mode = TRUE;+ if (!start_decoder(&p)) {+ if (p.eof)+ *error = VORBIS_need_more_data;+ else+ *error = p.error;+ return NULL;+ }+ f = vorbis_alloc(&p);+ if (f) {+ *f = p;+ *data_used = (int) (f->stream - data);+ *error = 0;+ return f;+ } else {+ vorbis_deinit(&p);+ return NULL;+ }+}+#endif // STB_VORBIS_NO_PUSHDATA_API++unsigned int stb_vorbis_get_file_offset(stb_vorbis *f)+{+ #ifndef STB_VORBIS_NO_PUSHDATA_API+ if (f->push_mode) return 0;+ #endif+ if (USE_MEMORY(f)) return (unsigned int) (f->stream - f->stream_start);+ #ifndef STB_VORBIS_NO_STDIO+ return (unsigned int) (ftell(f->f) - f->f_start);+ #endif+}++#ifndef STB_VORBIS_NO_PULLDATA_API+//+// DATA-PULLING API+//++static uint32 vorbis_find_page(stb_vorbis *f, uint32 *end, uint32 *last)+{+ for(;;) {+ int n;+ if (f->eof) return 0;+ n = get8(f);+ if (n == 0x4f) { // page header candidate+ unsigned int retry_loc = stb_vorbis_get_file_offset(f);+ int i;+ // check if we're off the end of a file_section stream+ if (retry_loc - 25 > f->stream_len)+ return 0;+ // check the rest of the header+ for (i=1; i < 4; ++i)+ if (get8(f) != ogg_page_header[i])+ break;+ if (f->eof) return 0;+ if (i == 4) {+ uint8 header[27];+ uint32 i, crc, goal, len;+ for (i=0; i < 4; ++i)+ header[i] = ogg_page_header[i];+ for (; i < 27; ++i)+ header[i] = get8(f);+ if (f->eof) return 0;+ if (header[4] != 0) goto invalid;+ goal = header[22] + (header[23] << 8) + (header[24]<<16) + (header[25]<<24);+ for (i=22; i < 26; ++i)+ header[i] = 0;+ crc = 0;+ for (i=0; i < 27; ++i)+ crc = crc32_update(crc, header[i]);+ len = 0;+ for (i=0; i < header[26]; ++i) {+ int s = get8(f);+ crc = crc32_update(crc, s);+ len += s;+ }+ if (len && f->eof) return 0;+ for (i=0; i < len; ++i)+ crc = crc32_update(crc, get8(f));+ // finished parsing probable page+ if (crc == goal) {+ // we could now check that it's either got the last+ // page flag set, OR it's followed by the capture+ // pattern, but I guess TECHNICALLY you could have+ // a file with garbage between each ogg page and recover+ // from it automatically? So even though that paranoia+ // might decrease the chance of an invalid decode by+ // another 2^32, not worth it since it would hose those+ // invalid-but-useful files?+ if (end)+ *end = stb_vorbis_get_file_offset(f);+ if (last) {+ if (header[5] & 0x04)+ *last = 1;+ else+ *last = 0;+ }+ set_file_offset(f, retry_loc-1);+ return 1;+ }+ }+ invalid:+ // not a valid page, so rewind and look for next one+ set_file_offset(f, retry_loc);+ }+ }+}+++#define SAMPLE_unknown 0xffffffff++// seeking is implemented with a binary search, which narrows down the range to+// 64K, before using a linear search (because finding the synchronization+// pattern can be expensive, and the chance we'd find the end page again is+// relatively high for small ranges)+//+// two initial interpolation-style probes are used at the start of the search+// to try to bound either side of the binary search sensibly, while still+// working in O(log n) time if they fail.++static int get_seek_page_info(stb_vorbis *f, ProbedPage *z)+{+ uint8 header[27], lacing[255];+ int i,len;++ // record where the page starts+ z->page_start = stb_vorbis_get_file_offset(f);++ // parse the header+ getn(f, header, 27);+ if (header[0] != 'O' || header[1] != 'g' || header[2] != 'g' || header[3] != 'S')+ return 0;+ getn(f, lacing, header[26]);++ // determine the length of the payload+ len = 0;+ for (i=0; i < header[26]; ++i)+ len += lacing[i];++ // this implies where the page ends+ z->page_end = z->page_start + 27 + header[26] + len;++ // read the last-decoded sample out of the data+ z->last_decoded_sample = header[6] + (header[7] << 8) + (header[8] << 16) + (header[9] << 24);++ // restore file state to where we were+ set_file_offset(f, z->page_start);+ return 1;+}++// rarely used function to seek back to the preceeding page while finding the+// start of a packet+static int go_to_page_before(stb_vorbis *f, unsigned int limit_offset)+{+ unsigned int previous_safe, end;++ // now we want to seek back 64K from the limit+ if (limit_offset >= 65536 && limit_offset-65536 >= f->first_audio_page_offset)+ previous_safe = limit_offset - 65536;+ else+ previous_safe = f->first_audio_page_offset;++ set_file_offset(f, previous_safe);++ while (vorbis_find_page(f, &end, NULL)) {+ if (end >= limit_offset && stb_vorbis_get_file_offset(f) < limit_offset)+ return 1;+ set_file_offset(f, end);+ }++ return 0;+}++// implements the search logic for finding a page and starting decoding. if+// the function succeeds, current_loc_valid will be true and current_loc will+// be less than or equal to the provided sample number (the closer the+// better).+static int seek_to_sample_coarse(stb_vorbis *f, uint32 sample_number)+{+ ProbedPage left, right, mid;+ int i, start_seg_with_known_loc, end_pos, page_start;+ uint32 delta, stream_length, padding;+ double offset, bytes_per_sample;+ int probe = 0;++ // find the last page and validate the target sample+ stream_length = stb_vorbis_stream_length_in_samples(f);+ if (stream_length == 0) return error(f, VORBIS_seek_without_length);+ if (sample_number > stream_length) return error(f, VORBIS_seek_invalid);++ // this is the maximum difference between the window-center (which is the+ // actual granule position value), and the right-start (which the spec+ // indicates should be the granule position (give or take one)).+ padding = ((f->blocksize_1 - f->blocksize_0) >> 2);+ if (sample_number < padding)+ sample_number = 0;+ else+ sample_number -= padding;++ left = f->p_first;+ while (left.last_decoded_sample == ~0U) {+ // (untested) the first page does not have a 'last_decoded_sample'+ set_file_offset(f, left.page_end);+ if (!get_seek_page_info(f, &left)) goto error;+ }++ right = f->p_last;+ assert(right.last_decoded_sample != ~0U);++ // starting from the start is handled differently+ if (sample_number <= left.last_decoded_sample) {+ if (stb_vorbis_seek_start(f))+ return 1;+ return 0;+ }++ while (left.page_end != right.page_start) {+ assert(left.page_end < right.page_start);+ // search range in bytes+ delta = right.page_start - left.page_end;+ if (delta <= 65536) {+ // there's only 64K left to search - handle it linearly+ set_file_offset(f, left.page_end);+ } else {+ if (probe < 2) {+ if (probe == 0) {+ // first probe (interpolate)+ double data_bytes = right.page_end - left.page_start;+ bytes_per_sample = data_bytes / right.last_decoded_sample;+ offset = left.page_start + bytes_per_sample * (sample_number - left.last_decoded_sample);+ } else {+ // second probe (try to bound the other side)+ double error = ((double) sample_number - mid.last_decoded_sample) * bytes_per_sample;+ if (error >= 0 && error < 8000) error = 8000;+ if (error < 0 && error > -8000) error = -8000;+ offset += error * 2;+ }++ // ensure the offset is valid+ if (offset < left.page_end)+ offset = left.page_end;+ if (offset > right.page_start - 65536)+ offset = right.page_start - 65536;++ set_file_offset(f, (unsigned int) offset);+ } else {+ // binary search for large ranges (offset by 32K to ensure+ // we don't hit the right page)+ set_file_offset(f, left.page_end + (delta / 2) - 32768);+ }++ if (!vorbis_find_page(f, NULL, NULL)) goto error;+ }++ for (;;) {+ if (!get_seek_page_info(f, &mid)) goto error;+ if (mid.last_decoded_sample != ~0U) break;+ // (untested) no frames end on this page+ set_file_offset(f, mid.page_end);+ assert(mid.page_start < right.page_start);+ }++ // if we've just found the last page again then we're in a tricky file,+ // and we're close enough.+ if (mid.page_start == right.page_start)+ break;++ if (sample_number < mid.last_decoded_sample)+ right = mid;+ else+ left = mid;++ ++probe;+ }++ // seek back to start of the last packet+ page_start = left.page_start;+ set_file_offset(f, page_start);+ if (!start_page(f)) return error(f, VORBIS_seek_failed);+ end_pos = f->end_seg_with_known_loc;+ assert(end_pos >= 0);++ for (;;) {+ for (i = end_pos; i > 0; --i)+ if (f->segments[i-1] != 255)+ break;++ start_seg_with_known_loc = i;++ if (start_seg_with_known_loc > 0 || !(f->page_flag & PAGEFLAG_continued_packet))+ break;++ // (untested) the final packet begins on an earlier page+ if (!go_to_page_before(f, page_start))+ goto error;++ page_start = stb_vorbis_get_file_offset(f);+ if (!start_page(f)) goto error;+ end_pos = f->segment_count - 1;+ }++ // prepare to start decoding+ f->current_loc_valid = FALSE;+ f->last_seg = FALSE;+ f->valid_bits = 0;+ f->packet_bytes = 0;+ f->bytes_in_seg = 0;+ f->previous_length = 0;+ f->next_seg = start_seg_with_known_loc;++ for (i = 0; i < start_seg_with_known_loc; i++)+ skip(f, f->segments[i]);++ // start decoding (optimizable - this frame is generally discarded)+ if (!vorbis_pump_first_frame(f))+ return 0;+ if (f->current_loc > sample_number)+ return error(f, VORBIS_seek_failed);+ return 1;++error:+ // try to restore the file to a valid state+ stb_vorbis_seek_start(f);+ return error(f, VORBIS_seek_failed);+}++// the same as vorbis_decode_initial, but without advancing+static int peek_decode_initial(vorb *f, int *p_left_start, int *p_left_end, int *p_right_start, int *p_right_end, int *mode)+{+ int bits_read, bytes_read;++ if (!vorbis_decode_initial(f, p_left_start, p_left_end, p_right_start, p_right_end, mode))+ return 0;++ // either 1 or 2 bytes were read, figure out which so we can rewind+ bits_read = 1 + ilog(f->mode_count-1);+ if (f->mode_config[*mode].blockflag)+ bits_read += 2;+ bytes_read = (bits_read + 7) / 8;++ f->bytes_in_seg += bytes_read;+ f->packet_bytes -= bytes_read;+ skip(f, -bytes_read);+ if (f->next_seg == -1)+ f->next_seg = f->segment_count - 1;+ else+ f->next_seg--;+ f->valid_bits = 0;++ return 1;+}++int stb_vorbis_seek_frame(stb_vorbis *f, unsigned int sample_number)+{+ uint32 max_frame_samples;++ if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing);++ // fast page-level search+ if (!seek_to_sample_coarse(f, sample_number))+ return 0;++ assert(f->current_loc_valid);+ assert(f->current_loc <= sample_number);++ // linear search for the relevant packet+ max_frame_samples = (f->blocksize_1*3 - f->blocksize_0) >> 2;+ while (f->current_loc < sample_number) {+ int left_start, left_end, right_start, right_end, mode, frame_samples;+ if (!peek_decode_initial(f, &left_start, &left_end, &right_start, &right_end, &mode))+ return error(f, VORBIS_seek_failed);+ // calculate the number of samples returned by the next frame+ frame_samples = right_start - left_start;+ if (f->current_loc + frame_samples > sample_number) {+ return 1; // the next frame will contain the sample+ } else if (f->current_loc + frame_samples + max_frame_samples > sample_number) {+ // there's a chance the frame after this could contain the sample+ vorbis_pump_first_frame(f);+ } else {+ // this frame is too early to be relevant+ f->current_loc += frame_samples;+ f->previous_length = 0;+ maybe_start_packet(f);+ flush_packet(f);+ }+ }+ // the next frame will start with the sample+ assert(f->current_loc == sample_number);+ return 1;+}++int stb_vorbis_seek(stb_vorbis *f, unsigned int sample_number)+{+ if (!stb_vorbis_seek_frame(f, sample_number))+ return 0;++ if (sample_number != f->current_loc) {+ int n;+ uint32 frame_start = f->current_loc;+ stb_vorbis_get_frame_float(f, &n, NULL);+ assert(sample_number > frame_start);+ assert(f->channel_buffer_start + (int) (sample_number-frame_start) <= f->channel_buffer_end);+ f->channel_buffer_start += (sample_number - frame_start);+ }++ return 1;+}++int stb_vorbis_seek_start(stb_vorbis *f)+{+ if (IS_PUSH_MODE(f)) { return error(f, VORBIS_invalid_api_mixing); }+ set_file_offset(f, f->first_audio_page_offset);+ f->previous_length = 0;+ f->first_decode = TRUE;+ f->next_seg = -1;+ return vorbis_pump_first_frame(f);+}++unsigned int stb_vorbis_stream_length_in_samples(stb_vorbis *f)+{+ unsigned int restore_offset, previous_safe;+ unsigned int end, last_page_loc;++ if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing);+ if (!f->total_samples) {+ unsigned int last;+ uint32 lo,hi;+ char header[6];++ // first, store the current decode position so we can restore it+ restore_offset = stb_vorbis_get_file_offset(f);++ // now we want to seek back 64K from the end (the last page must+ // be at most a little less than 64K, but let's allow a little slop)+ if (f->stream_len >= 65536 && f->stream_len-65536 >= f->first_audio_page_offset)+ previous_safe = f->stream_len - 65536;+ else+ previous_safe = f->first_audio_page_offset;++ set_file_offset(f, previous_safe);+ // previous_safe is now our candidate 'earliest known place that seeking+ // to will lead to the final page'++ if (!vorbis_find_page(f, &end, &last)) {+ // if we can't find a page, we're hosed!+ f->error = VORBIS_cant_find_last_page;+ f->total_samples = 0xffffffff;+ goto done;+ }++ // check if there are more pages+ last_page_loc = stb_vorbis_get_file_offset(f);++ // stop when the last_page flag is set, not when we reach eof;+ // this allows us to stop short of a 'file_section' end without+ // explicitly checking the length of the section+ while (!last) {+ set_file_offset(f, end);+ if (!vorbis_find_page(f, &end, &last)) {+ // the last page we found didn't have the 'last page' flag+ // set. whoops!+ break;+ }+ previous_safe = last_page_loc+1;+ last_page_loc = stb_vorbis_get_file_offset(f);+ }++ set_file_offset(f, last_page_loc);++ // parse the header+ getn(f, (unsigned char *)header, 6);+ // extract the absolute granule position+ lo = get32(f);+ hi = get32(f);+ if (lo == 0xffffffff && hi == 0xffffffff) {+ f->error = VORBIS_cant_find_last_page;+ f->total_samples = SAMPLE_unknown;+ goto done;+ }+ if (hi)+ lo = 0xfffffffe; // saturate+ f->total_samples = lo;++ f->p_last.page_start = last_page_loc;+ f->p_last.page_end = end;+ f->p_last.last_decoded_sample = lo;++ done:+ set_file_offset(f, restore_offset);+ }+ return f->total_samples == SAMPLE_unknown ? 0 : f->total_samples;+}++float stb_vorbis_stream_length_in_seconds(stb_vorbis *f)+{+ return stb_vorbis_stream_length_in_samples(f) / (float) f->sample_rate;+}++++int stb_vorbis_get_frame_float(stb_vorbis *f, int *channels, float ***output)+{+ int len, right,left,i;+ if (IS_PUSH_MODE(f)) return error(f, VORBIS_invalid_api_mixing);++ if (!vorbis_decode_packet(f, &len, &left, &right)) {+ f->channel_buffer_start = f->channel_buffer_end = 0;+ return 0;+ }++ len = vorbis_finish_frame(f, len, left, right);+ for (i=0; i < f->channels; ++i)+ f->outputs[i] = f->channel_buffers[i] + left;++ f->channel_buffer_start = left;+ f->channel_buffer_end = left+len;++ if (channels) *channels = f->channels;+ if (output) *output = f->outputs;+ return len;+}++#ifndef STB_VORBIS_NO_STDIO++stb_vorbis * stb_vorbis_open_file_section(FILE *file, int close_on_free, int *error, const stb_vorbis_alloc *alloc, unsigned int length)+{+ stb_vorbis *f, p;+ vorbis_init(&p, alloc);+ p.f = file;+ p.f_start = (uint32) ftell(file);+ p.stream_len = length;+ p.close_on_free = close_on_free;+ if (start_decoder(&p)) {+ f = vorbis_alloc(&p);+ if (f) {+ *f = p;+ vorbis_pump_first_frame(f);+ return f;+ }+ }+ if (error) *error = p.error;+ vorbis_deinit(&p);+ return NULL;+}++stb_vorbis * stb_vorbis_open_file(FILE *file, int close_on_free, int *error, const stb_vorbis_alloc *alloc)+{+ unsigned int len, start;+ start = (unsigned int) ftell(file);+ fseek(file, 0, SEEK_END);+ len = (unsigned int) (ftell(file) - start);+ fseek(file, start, SEEK_SET);+ return stb_vorbis_open_file_section(file, close_on_free, error, alloc, len);+}++stb_vorbis * stb_vorbis_open_filename(const char *filename, int *error, const stb_vorbis_alloc *alloc)+{+ FILE *f = fopen(filename, "rb");+ if (f) + return stb_vorbis_open_file(f, TRUE, error, alloc);+ if (error) *error = VORBIS_file_open_failure;+ return NULL;+}+#endif // STB_VORBIS_NO_STDIO++stb_vorbis * stb_vorbis_open_memory(const unsigned char *data, int len, int *error, const stb_vorbis_alloc *alloc)+{+ stb_vorbis *f, p;+ if (data == NULL) return NULL;+ vorbis_init(&p, alloc);+ p.stream = (uint8 *) data;+ p.stream_end = (uint8 *) data + len;+ p.stream_start = (uint8 *) p.stream;+ p.stream_len = len;+ p.push_mode = FALSE;+ if (start_decoder(&p)) {+ f = vorbis_alloc(&p);+ if (f) {+ *f = p;+ vorbis_pump_first_frame(f);+ if (error) *error = VORBIS__no_error;+ return f;+ }+ }+ if (error) *error = p.error;+ vorbis_deinit(&p);+ return NULL;+}++#ifndef STB_VORBIS_NO_INTEGER_CONVERSION+#define PLAYBACK_MONO 1+#define PLAYBACK_LEFT 2+#define PLAYBACK_RIGHT 4++#define L (PLAYBACK_LEFT | PLAYBACK_MONO)+#define C (PLAYBACK_LEFT | PLAYBACK_RIGHT | PLAYBACK_MONO)+#define R (PLAYBACK_RIGHT | PLAYBACK_MONO)++static int8 channel_position[7][6] =+{+ { 0 },+ { C },+ { L, R },+ { L, C, R },+ { L, R, L, R },+ { L, C, R, L, R },+ { L, C, R, L, R, C },+};+++#ifndef STB_VORBIS_NO_FAST_SCALED_FLOAT+ typedef union {+ float f;+ int i;+ } float_conv;+ typedef char stb_vorbis_float_size_test[sizeof(float)==4 && sizeof(int) == 4];+ #define FASTDEF(x) float_conv x+ // add (1<<23) to convert to int, then divide by 2^SHIFT, then add 0.5/2^SHIFT to round+ #define MAGIC(SHIFT) (1.5f * (1 << (23-SHIFT)) + 0.5f/(1 << SHIFT))+ #define ADDEND(SHIFT) (((150-SHIFT) << 23) + (1 << 22))+ #define FAST_SCALED_FLOAT_TO_INT(temp,x,s) (temp.f = (x) + MAGIC(s), temp.i - ADDEND(s))+ #define check_endianness() +#else+ #define FAST_SCALED_FLOAT_TO_INT(temp,x,s) ((int) ((x) * (1 << (s))))+ #define check_endianness()+ #define FASTDEF(x)+#endif++static void copy_samples(short *dest, float *src, int len)+{+ int i;+ check_endianness();+ for (i=0; i < len; ++i) {+ FASTDEF(temp);+ int v = FAST_SCALED_FLOAT_TO_INT(temp, src[i],15);+ if ((unsigned int) (v + 32768) > 65535)+ v = v < 0 ? -32768 : 32767;+ dest[i] = v;+ }+}++static void compute_samples(int mask, short *output, int num_c, float **data, int d_offset, int len)+{+ #define BUFFER_SIZE 32+ float buffer[BUFFER_SIZE];+ int i,j,o,n = BUFFER_SIZE;+ check_endianness();+ for (o = 0; o < len; o += BUFFER_SIZE) {+ memset(buffer, 0, sizeof(buffer));+ if (o + n > len) n = len - o;+ for (j=0; j < num_c; ++j) {+ if (channel_position[num_c][j] & mask) {+ for (i=0; i < n; ++i)+ buffer[i] += data[j][d_offset+o+i];+ }+ }+ for (i=0; i < n; ++i) {+ FASTDEF(temp);+ int v = FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15);+ if ((unsigned int) (v + 32768) > 65535)+ v = v < 0 ? -32768 : 32767;+ output[o+i] = v;+ }+ }+}++static void compute_stereo_samples(short *output, int num_c, float **data, int d_offset, int len)+{+ #define BUFFER_SIZE 32+ float buffer[BUFFER_SIZE];+ int i,j,o,n = BUFFER_SIZE >> 1;+ // o is the offset in the source data+ check_endianness();+ for (o = 0; o < len; o += BUFFER_SIZE >> 1) {+ // o2 is the offset in the output data+ int o2 = o << 1;+ memset(buffer, 0, sizeof(buffer));+ if (o + n > len) n = len - o;+ for (j=0; j < num_c; ++j) {+ int m = channel_position[num_c][j] & (PLAYBACK_LEFT | PLAYBACK_RIGHT);+ if (m == (PLAYBACK_LEFT | PLAYBACK_RIGHT)) {+ for (i=0; i < n; ++i) {+ buffer[i*2+0] += data[j][d_offset+o+i];+ buffer[i*2+1] += data[j][d_offset+o+i];+ }+ } else if (m == PLAYBACK_LEFT) {+ for (i=0; i < n; ++i) {+ buffer[i*2+0] += data[j][d_offset+o+i];+ }+ } else if (m == PLAYBACK_RIGHT) {+ for (i=0; i < n; ++i) {+ buffer[i*2+1] += data[j][d_offset+o+i];+ }+ }+ }+ for (i=0; i < (n<<1); ++i) {+ FASTDEF(temp);+ int v = FAST_SCALED_FLOAT_TO_INT(temp,buffer[i],15);+ if ((unsigned int) (v + 32768) > 65535)+ v = v < 0 ? -32768 : 32767;+ output[o2+i] = v;+ }+ }+}++static void convert_samples_short(int buf_c, short **buffer, int b_offset, int data_c, float **data, int d_offset, int samples)+{+ int i;+ if (buf_c != data_c && buf_c <= 2 && data_c <= 6) {+ static int channel_selector[3][2] = { {0}, {PLAYBACK_MONO}, {PLAYBACK_LEFT, PLAYBACK_RIGHT} };+ for (i=0; i < buf_c; ++i)+ compute_samples(channel_selector[buf_c][i], buffer[i]+b_offset, data_c, data, d_offset, samples);+ } else {+ int limit = buf_c < data_c ? buf_c : data_c;+ for (i=0; i < limit; ++i)+ copy_samples(buffer[i]+b_offset, data[i]+d_offset, samples);+ for ( ; i < buf_c; ++i)+ memset(buffer[i]+b_offset, 0, sizeof(short) * samples);+ }+}++int stb_vorbis_get_frame_short(stb_vorbis *f, int num_c, short **buffer, int num_samples)+{+ float **output;+ int len = stb_vorbis_get_frame_float(f, NULL, &output);+ if (len > num_samples) len = num_samples;+ if (len)+ convert_samples_short(num_c, buffer, 0, f->channels, output, 0, len);+ return len;+}++static void convert_channels_short_interleaved(int buf_c, short *buffer, int data_c, float **data, int d_offset, int len)+{+ int i;+ check_endianness();+ if (buf_c != data_c && buf_c <= 2 && data_c <= 6) {+ assert(buf_c == 2);+ for (i=0; i < buf_c; ++i)+ compute_stereo_samples(buffer, data_c, data, d_offset, len);+ } else {+ int limit = buf_c < data_c ? buf_c : data_c;+ int j;+ for (j=0; j < len; ++j) {+ for (i=0; i < limit; ++i) {+ FASTDEF(temp);+ float f = data[i][d_offset+j];+ int v = FAST_SCALED_FLOAT_TO_INT(temp, f,15);//data[i][d_offset+j],15);+ if ((unsigned int) (v + 32768) > 65535)+ v = v < 0 ? -32768 : 32767;+ *buffer++ = v;+ }+ for ( ; i < buf_c; ++i)+ *buffer++ = 0;+ }+ }+}++int stb_vorbis_get_frame_short_interleaved(stb_vorbis *f, int num_c, short *buffer, int num_shorts)+{+ float **output;+ int len;+ if (num_c == 1) return stb_vorbis_get_frame_short(f,num_c,&buffer, num_shorts);+ len = stb_vorbis_get_frame_float(f, NULL, &output);+ if (len) {+ if (len*num_c > num_shorts) len = num_shorts / num_c;+ convert_channels_short_interleaved(num_c, buffer, f->channels, output, 0, len);+ }+ return len;+}++int stb_vorbis_get_samples_short_interleaved(stb_vorbis *f, int channels, short *buffer, int num_shorts)+{+ float **outputs;+ int len = num_shorts / channels;+ int n=0;+ int z = f->channels;+ if (z > channels) z = channels;+ while (n < len) {+ int k = f->channel_buffer_end - f->channel_buffer_start;+ if (n+k >= len) k = len - n;+ if (k)+ convert_channels_short_interleaved(channels, buffer, f->channels, f->channel_buffers, f->channel_buffer_start, k);+ buffer += k*channels;+ n += k;+ f->channel_buffer_start += k;+ if (n == len) break;+ if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break;+ }+ return n;+}++int stb_vorbis_get_samples_short(stb_vorbis *f, int channels, short **buffer, int len)+{+ float **outputs;+ int n=0;+ int z = f->channels;+ if (z > channels) z = channels;+ while (n < len) {+ int k = f->channel_buffer_end - f->channel_buffer_start;+ if (n+k >= len) k = len - n;+ if (k)+ convert_samples_short(channels, buffer, n, f->channels, f->channel_buffers, f->channel_buffer_start, k);+ n += k;+ f->channel_buffer_start += k;+ if (n == len) break;+ if (!stb_vorbis_get_frame_float(f, NULL, &outputs)) break;+ }+ return n;+}++#ifndef STB_VORBIS_NO_STDIO+int stb_vorbis_decode_filename(const char *filename, int *channels, int *sample_rate, short **output)+{+ int data_len, offset, total, limit, error;+ short *data;+ stb_vorbis *v = stb_vorbis_open_filename(filename, &error, NULL);+ if (v == NULL) return -1;+ limit = v->channels * 4096;+ *channels = v->channels;+ if (sample_rate)+ *sample_rate = v->sample_rate;+ offset = data_len = 0;+ total = limit;+ data = (short *) malloc(total * sizeof(*data));+ if (data == NULL) {+ stb_vorbis_close(v);+ return -2;+ }+ for (;;) {+ int n = stb_vorbis_get_frame_short_interleaved(v, v->channels, data+offset, total-offset);+ if (n == 0) break;+ data_len += n;+ offset += n * v->channels;+ if (offset + limit > total) {+ short *data2;+ total *= 2;+ data2 = (short *) realloc(data, total * sizeof(*data));+ if (data2 == NULL) {+ free(data);+ stb_vorbis_close(v);+ return -2;+ }+ data = data2;+ }+ }+ *output = data;+ stb_vorbis_close(v);+ return data_len;+}+#endif // NO_STDIO++int stb_vorbis_decode_memory(const uint8 *mem, int len, int *channels, int *sample_rate, short **output)+{+ int data_len, offset, total, limit, error;+ short *data;+ stb_vorbis *v = stb_vorbis_open_memory(mem, len, &error, NULL);+ if (v == NULL) return -1;+ limit = v->channels * 4096;+ *channels = v->channels;+ if (sample_rate)+ *sample_rate = v->sample_rate;+ offset = data_len = 0;+ total = limit;+ data = (short *) malloc(total * sizeof(*data));+ if (data == NULL) {+ stb_vorbis_close(v);+ return -2;+ }+ for (;;) {+ int n = stb_vorbis_get_frame_short_interleaved(v, v->channels, data+offset, total-offset);+ if (n == 0) break;+ data_len += n;+ offset += n * v->channels;+ if (offset + limit > total) {+ short *data2;+ total *= 2;+ data2 = (short *) realloc(data, total * sizeof(*data));+ if (data2 == NULL) {+ free(data);+ stb_vorbis_close(v);+ return -2;+ }+ data = data2;+ }+ }+ *output = data;+ stb_vorbis_close(v);+ return data_len;+}+#endif // STB_VORBIS_NO_INTEGER_CONVERSION++int stb_vorbis_get_samples_float_interleaved(stb_vorbis *f, int channels, float *buffer, int num_floats)+{+ float **outputs;+ int len = num_floats / channels;+ int n=0;+ int z = f->channels;+ if (z > channels) z = channels;+ while (n < len) {+ int i,j;+ int k = f->channel_buffer_end - f->channel_buffer_start;+ if (n+k >= len) k = len - n;+ for (j=0; j < k; ++j) {+ for (i=0; i < z; ++i)+ *buffer++ = f->channel_buffers[i][f->channel_buffer_start+j];+ for ( ; i < channels; ++i)+ *buffer++ = 0;+ }+ n += k;+ f->channel_buffer_start += k;+ if (n == len)+ break;+ if (!stb_vorbis_get_frame_float(f, NULL, &outputs))+ break;+ }+ return n;+}++int stb_vorbis_get_samples_float(stb_vorbis *f, int channels, float **buffer, int num_samples)+{+ float **outputs;+ int n=0;+ int z = f->channels;+ if (z > channels) z = channels;+ while (n < num_samples) {+ int i;+ int k = f->channel_buffer_end - f->channel_buffer_start;+ if (n+k >= num_samples) k = num_samples - n;+ if (k) {+ for (i=0; i < z; ++i)+ memcpy(buffer[i]+n, f->channel_buffers[i]+f->channel_buffer_start, sizeof(float)*k);+ for ( ; i < channels; ++i)+ memset(buffer[i]+n, 0, sizeof(float) * k);+ }+ n += k;+ f->channel_buffer_start += k;+ if (n == num_samples)+ break;+ if (!stb_vorbis_get_frame_float(f, NULL, &outputs))+ break;+ }+ return n;+}+#endif // STB_VORBIS_NO_PULLDATA_API++/* Version history+ 1.12 - 2017-11-21 - limit residue begin/end to blocksize/2 to avoid large temp allocs in bad/corrupt files+ 1.11 - 2017-07-23 - fix MinGW compilation + 1.10 - 2017-03-03 - more robust seeking; fix negative ilog(); clear error in open_memory+ 1.09 - 2016-04-04 - back out 'avoid discarding last frame' fix from previous version+ 1.08 - 2016-04-02 - fixed multiple warnings; fix setup memory leaks;+ avoid discarding last frame of audio data+ 1.07 - 2015-01-16 - fixed some warnings, fix mingw, const-correct API+ some more crash fixes when out of memory or with corrupt files + 1.06 - 2015-08-31 - full, correct support for seeking API (Dougall Johnson)+ some crash fixes when out of memory or with corrupt files+ 1.05 - 2015-04-19 - don't define __forceinline if it's redundant+ 1.04 - 2014-08-27 - fix missing const-correct case in API+ 1.03 - 2014-08-07 - Warning fixes+ 1.02 - 2014-07-09 - Declare qsort compare function _cdecl on windows+ 1.01 - 2014-06-18 - fix stb_vorbis_get_samples_float+ 1.0 - 2014-05-26 - fix memory leaks; fix warnings; fix bugs in multichannel+ (API change) report sample rate for decode-full-file funcs+ 0.99996 - bracket #include <malloc.h> for macintosh compilation by Laurent Gomila+ 0.99995 - use union instead of pointer-cast for fast-float-to-int to avoid alias-optimization problem+ 0.99994 - change fast-float-to-int to work in single-precision FPU mode, remove endian-dependence+ 0.99993 - remove assert that fired on legal files with empty tables+ 0.99992 - rewind-to-start+ 0.99991 - bugfix to stb_vorbis_get_samples_short by Bernhard Wodo+ 0.9999 - (should have been 0.99990) fix no-CRT support, compiling as C+++ 0.9998 - add a full-decode function with a memory source+ 0.9997 - fix a bug in the read-from-FILE case in 0.9996 addition+ 0.9996 - query length of vorbis stream in samples/seconds+ 0.9995 - bugfix to another optimization that only happened in certain files+ 0.9994 - bugfix to one of the optimizations that caused significant (but inaudible?) errors+ 0.9993 - performance improvements; runs in 99% to 104% of time of reference implementation+ 0.9992 - performance improvement of IMDCT; now performs close to reference implementation+ 0.9991 - performance improvement of IMDCT+ 0.999 - (should have been 0.9990) performance improvement of IMDCT+ 0.998 - no-CRT support from Casey Muratori+ 0.997 - bugfixes for bugs found by Terje Mathisen+ 0.996 - bugfix: fast-huffman decode initialized incorrectly for sparse codebooks; fixing gives 10% speedup - found by Terje Mathisen+ 0.995 - bugfix: fix to 'effective' overrun detection - found by Terje Mathisen+ 0.994 - bugfix: garbage decode on final VQ symbol of a non-multiple - found by Terje Mathisen+ 0.993 - bugfix: pushdata API required 1 extra byte for empty page (failed to consume final page if empty) - found by Terje Mathisen+ 0.992 - fixes for MinGW warning+ 0.991 - turn fast-float-conversion on by default+ 0.990 - fix push-mode seek recovery if you seek into the headers+ 0.98b - fix to bad release of 0.98+ 0.98 - fix push-mode seek recovery; robustify float-to-int and support non-fast mode+ 0.97 - builds under c++ (typecasting, don't use 'class' keyword)+ 0.96 - somehow MY 0.95 was right, but the web one was wrong, so here's my 0.95 rereleased as 0.96, fixes a typo in the clamping code+ 0.95 - clamping code for 16-bit functions+ 0.94 - not publically released+ 0.93 - fixed all-zero-floor case (was decoding garbage)+ 0.92 - fixed a memory leak+ 0.91 - conditional compiles to omit parts of the API and the infrastructure to support them: STB_VORBIS_NO_PULLDATA_API, STB_VORBIS_NO_PUSHDATA_API, STB_VORBIS_NO_STDIO, STB_VORBIS_NO_INTEGER_CONVERSION+ 0.90 - first public release+*/++#endif // STB_VORBIS_HEADER_ONLY+++/*+------------------------------------------------------------------------------+This software is available under 2 licenses -- choose whichever you prefer.+------------------------------------------------------------------------------+ALTERNATIVE A - MIT License+Copyright (c) 2017 Sean Barrett+Permission is hereby granted, free of charge, to any person obtaining a copy of +this software and associated documentation files (the "Software"), to deal in +the Software without restriction, including without limitation the rights to +use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +of the Software, and to permit persons to whom the Software is furnished to do +so, subject to the following conditions:+The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software.+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE.+------------------------------------------------------------------------------+ALTERNATIVE B - Public Domain (www.unlicense.org)+This is free and unencumbered software released into the public domain.+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this +software, either in source code form or as a compiled binary, for any purpose, +commercial or non-commercial, and by any means.+In jurisdictions that recognize copyright laws, the author or authors of this +software dedicate any and all copyright interest in the software to the public +domain. We make this dedication for the benefit of the public at large and to +the detriment of our heirs and successors. We intend this dedication to be an +overt act of relinquishment in perpetuity of all present and future rights to +this software under copyright law.+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN +ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.+------------------------------------------------------------------------------+*/
proteaaudio.cabal view
@@ -1,14 +1,14 @@ Name: proteaaudio-Version: 0.7.0.1+Version: 0.7.1.0 Synopsis: Simple audio library for Windows, Linux, OSX.-Description: Simple audio library for Windows, Linux, OSX. Supports Ogg and Wav playback and multichannel mixing.+Description: Simple audio library for Windows, Linux, OSX. Supports PCM, Ogg and Wav playback and multichannel mixing. License: BSD3 License-file: LICENSE Author: Csaba Hruska Maintainer: csaba.hruska@gmail.com Stability: Experimental Category: Sound-Tested-With: GHC == 8.0.2+Tested-With: GHC == 8.4.4 Cabal-Version: >= 1.10 Build-Type: Simple