musicw (empty) → 0.2.0

raw patch · 15 files changed

+2466/−0 lines, 15 filesdep +arraydep +basedep +bytestringsetup-changed

Dependencies added: array, base, bytestring, containers, data-default, file-embed, ghcjs-base, ghcjs-dom, ghcjs-prim, json, monad-loops, mtl, safe, text, time, transformers

Files

• LICENSE +674/−0
• MusicW.js +96/−0
• Setup.hs +2/−0
• musicw.cabal +53/−0
• src/Sound/MusicW.hs +12/−0
• src/Sound/MusicW/AudioBuffer.hs +124/−0
• src/Sound/MusicW/AudioContext.hs +142/−0
• src/Sound/MusicW/Buffer.hs +99/−0
• src/Sound/MusicW/Envelopes.hs +26/−0
• src/Sound/MusicW/FloatArraySpec.hs +57/−0
• src/Sound/MusicW/Node.hs +478/−0
• src/Sound/MusicW/Synth.hs +109/−0
• src/Sound/MusicW/SynthDef.hs +214/−0
• src/Sound/MusicW/Transformations.hs +71/−0
• src/Sound/MusicW/Worklets.hs +309/−0

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If not, see <http://www.gnu.org/licenses/>.++Also add information on how to contact you by electronic and paper mail.++  If the program does terminal interaction, make it output a short+notice like this when it starts in an interactive mode:++    {project}  Copyright (C) {year}  {fullname}+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.+    This is free software, and you are welcome to redistribute it+    under certain conditions; type `show c' for details.++The hypothetical commands `show w' and `show c' should show the appropriate+parts of the General Public License.  Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++  You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<http://www.gnu.org/licenses/>.++  The GNU General Public License does not permit incorporating your program+into proprietary programs.  If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library.  If this is what you want to do, use the GNU Lesser General+Public License instead of this License.  But first, please read+<http://www.gnu.org/philosophy/why-not-lgpl.html>.

@@ -0,0 +1,96 @@+/*+ * @class+ * @property {string | File | Blob} this.source+ * @property {('created' | 'loading' | 'decoding' | 'decoded' | 'error')} this.status+ * @property {?string} this.error+ * @property {?AudioBuffer} this.buffer+ *+ * @param {string | File | Blob} source - the source to load the audio buffer from+ * @param {WebAudioContext} ctx - the web audio context to use for decoding+ */+function Buffer(source, ctx) {+  this.source = source;+  this.ctx = ctx;++  this.status = 'created';+  this.error = null;+  this.buffer = null;+}++Buffer.prototype._changeStatus = function (onStatusChange, status, error, buffer) {+  this.status = status;+  this.error = error != null ? error : null; // If undefined set to null (not undefined)+  this.buffer = buffer != null ? buffer : null;+  onStatusChange(this);+}++/**+ * @param {function(buffer: Buffer): void} onStatusChange+ */+Buffer.prototype.startLoadingAndDecoding = function(onStatusChange) {+  var closure = this;+  var sourceIsUrl = typeof this.source === 'string';++  this._changeStatus(onStatusChange, 'loading');++  var loader = sourceIsUrl ? new XMLHttpRequest() : new FileReader();++  loader.onerror = function () {+    var message = 'Error loading buffer: ' + (sourceIsUrl ? loader.statusText : loader.error.message);+    closure._changeStatus(onStatusChange, 'error', message);+  }+  loader.onabort = this._changeStatus.bind(this, onStatusChange, 'abort', 'Read aborted', null);++  loader.onload = function() {+    closure._changeStatus(onStatusChange, 'decoding');++    var arrayBuffer = sourceIsUrl ? loader.response : loader.result;+    closure.ctx.decodeAudioData(arrayBuffer,+      function success(audioBuffer) {+        closure._changeStatus(onStatusChange, 'decoded', null, audioBuffer);+      },+      function failure(error) {+        closure._changeStatus(onStatusChange, 'error', 'Error decoding buffer: ' + error.message);+      }+    );+  }++  // Start reading.+  if (sourceIsUrl) {+    loader.responseType = 'arraybuffer';+    loader.open('GET', this.source, true);+    loader.send();+  } else {+    loader.readAsArrayBuffer(this.source);+  }+}++function startLoadingAndDecodingMultiple(list, cb){+  var closure = []+  var loaded = []+  for (i in list){++    console.log(i)+    console.log(list[i])+    console.log(loaded)+    list[i].startLoadingAndDecoding((x)=>{+      console.log("x is : " + x)+      console.log("x.status is : " + x.status)++      closure.push(x)+      var haveLoaded = true+      for (j in closure){+        haveLoaded = (closure[j].status == "error" || closure[j].status == "abort" || closure[j].status == "decoded")&&haveLoaded;+        if(haveLoaded){+          loaded.push(closure[j])+        }+      }+      console.log("cb test case:  haveloaded - "+(haveLoaded) +"  loadedlength - "+loaded.length);+      if (haveLoaded && loaded.length >= list.length  ){+        console.log("cb being called...")+        cb(closure)+      }+    });+  }+  console.log("closure:  "+closure)+}

@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,53 @@+name:                musicw+version:             0.2.0+synopsis:            Sound synthesis library, to be used with GHCJS and Web Audio API+description:         A library for sound synthesis, currently targeting GHCJS and the Web Audio API. Used in the Inner Ear and Estuary projects.+homepage:            http://github.com/d0kt0r0/reflex-synth/blob/master/README.md+license:             BSD3+license-file:        LICENSE+author:              David Ogborn, Jamie Beverley, Luis Navarro del Angel, Spencer Park and others+maintainer:          ogbornd@mcmaster.ca+copyright:           2017- David Ogborn, Jamie Beverley, Luis Navarro del Angel, Spencer Park and others+category:            Web+build-type:          Simple+cabal-version:       >=1.10+extra-source-files:++Library+  hs-source-dirs:  src+  js-sources:      MusicW.js+  Build-Depends:+      base >= 4.11.1.0 && < 4.12,+      containers >= 0.5.11.0 && < 0.6,+      safe >= 0.3.17 && < 0.4,+      ghcjs-base >= 0.2.0.0 && < 0.3,+      ghcjs-dom >= 0.9.2.0 && < 0.10,+      text >= 1.2.3.0 && < 1.3,+      array >= 0.5.2.0 && < 0.6,+      ghcjs-prim >= 0.1.1.0 && < 0.2,+      data-default >= 0.7.1.1 && < 0.8,+      transformers >= 0.5.5.0 && < 0.6,+      file-embed >= 0.0.10.1 && < 0.1,+      time >= 1.8.0.2 && < 1.9,+      monad-loops >= 0.4.3 && < 0.5,+      json >= 0.9.2 && < 0.10,+      bytestring >= 0.10.8.2 && < 0.11,+      mtl >= 2.2.2 && < 2.3+  GHC-Options:     -Wall -fwarn-tabs+  Exposed-modules: Sound.MusicW.AudioContext+                   Sound.MusicW.FloatArraySpec+                   Sound.MusicW.AudioBuffer+                   Sound.MusicW.Buffer+                   Sound.MusicW.Node+                   Sound.MusicW.SynthDef+                   Sound.MusicW.Synth+                   Sound.MusicW.Envelopes+                   Sound.MusicW.Transformations+                   Sound.MusicW.Worklets+                   Sound.MusicW+  other-modules:+  default-language: Haskell2010++source-repository head+  type:     git+  location: https://github.com/dktr0/MusicW.git

@@ -0,0 +1,12 @@+module Sound.MusicW (module E) where++import Sound.MusicW.AudioContext as E+import Sound.MusicW.FloatArraySpec as E+import Sound.MusicW.AudioBuffer as E+import Sound.MusicW.Buffer as E+import Sound.MusicW.Node as E+import Sound.MusicW.SynthDef as E+import Sound.MusicW.Synth as E+import Sound.MusicW.Envelopes as E+import Sound.MusicW.Transformations as E+import Sound.MusicW.Worklets as E

@@ -0,0 +1,124 @@+{-# LANGUAGE JavaScriptFFI #-}+module Sound.MusicW.AudioBuffer where++import GHCJS.Types+import GHCJS.Marshal.Pure+import Control.Monad+import GHCJS.Prim (toJSArray, fromJSInt, getProp)++import Sound.MusicW.AudioContext+import Sound.MusicW.FloatArraySpec++newtype AudioBuffer = AudioBuffer JSVal+instance Show AudioBuffer where show _ = "an AudioBuffer"+instance PToJSVal AudioBuffer where pToJSVal (AudioBuffer val) = val+instance PFromJSVal AudioBuffer where pFromJSVal = AudioBuffer++newtype Float32Array = Float32Array JSVal+instance Show Float32Array where show _ = "a Float32Array"+instance PToJSVal Float32Array where pToJSVal (Float32Array val) = val+instance PFromJSVal Float32Array where pFromJSVal = Float32Array++instantiateArraySpec :: Either Float32Array FloatArraySpec -> IO Float32Array+instantiateArraySpec (Left f32Arr) = return f32Arr+instantiateArraySpec (Right spec) = do+  array <- js_createTypedArray $ arraySpecSize spec+  fillArray 0 spec array+  return array++fillArray :: Int -> FloatArraySpec -> Float32Array -> IO ()+fillArray _ EmptyArray _ = return ()+fillArray i (Const n x tl) arr = do+  js_typedArraySetConst i (i + n) x arr+  fillArray (i + n) tl arr+fillArray i (Segment xs tl) arr = do+  jsArray <- toJSArray $ fmap pToJSVal xs+  len <- fmap fromJSInt $ getProp jsArray "length"+  js_typedArraySet i jsArray arr+  fillArray (i + len) tl arr+fillArray i (Repeated rep xs tl) arr = do+  jsArray <- toJSArray $ fmap pToJSVal xs+  len <- fmap fromJSInt $ getProp jsArray "length"+  forM_ [0..rep-1] $ \it -> js_typedArraySet (i + (it * len)) jsArray arr+  fillArray (i + (rep * len)) tl arr+++-- TODO: can all (or most?) of the "safe" declarations here be unsafe for efficiency?++foreign import javascript safe+  "if (Float32Array.prototype.fill !== void 0) { \+  \  $2.fill($1); \+  \} else { \+  \  for (var i = 0, len = a.length; i < len; i++) \+  \    $2[i] = $1; \+  \}"+  js_typedArrayFill :: Double -> Float32Array -> IO ()++foreign import javascript safe+  "if (Float32Array.prototype.fill !== void 0) { \+  \  $4.fill($3, $1, $2); \+  \} else { \+  \  for (var i = $1; i < Math.min($2, $4.length); i++) \+  \    $4[i] = $3; \+  \}"+  js_typedArraySetConst :: Int -> Int -> Double -> Float32Array -> IO ()+  -- fromIdx -> toIdx (exclusive) -> value -> array -> IO ()++foreign import javascript safe+  "$3.set($2, $1);"+  js_typedArraySet :: Int -> JSVal -> Float32Array -> IO ()+  -- startIdx -> fillFromJSArray -> array -> IO ()++foreign import javascript safe+  "$2[$1]"+  js_typedArrayGetAt :: Int -> Float32Array -> IO Double++foreign import javascript safe+  "$3[$1] = $2;"+  js_typedArraySetAt :: Int -> Double -> Float32Array -> IO ()++foreign import javascript safe+  "new Float32Array($1)"+  js_typedArrayFromArray :: JSVal -> IO Float32Array++foreign import javascript safe+  "new Float32Array($1)"+  js_createTypedArray :: Int -> IO Float32Array++foreign import javascript safe+  "$1.length"+  js_typedArrayLength :: Float32Array -> IO Int++foreign import javascript safe+  "$4.createBuffer($1, $2, $3)"+  js_createAudioBuffer :: Int -> Int -> Double -> AudioContext -> IO AudioBuffer+  -- numChannels -> length (in samples) -> sampleRate (frames/sec) -> ctx -> buffer++foreign import javascript safe+  "$1.getChannelData($2)"+  js_channelData :: AudioBuffer -> Int -> IO Float32Array+  -- buffer -> channel (0 indexed) -> data++foreign import javascript safe+  "$3.copyToChannel($1, $2);"+  js_copyToChannel :: Float32Array -> Int -> AudioBuffer -> IO ()++foreign import javascript safe+  "$1.length"+  js_bufferLength :: AudioBuffer -> IO Int++foreign import javascript safe+  "$1.duration"+  js_bufferDuration :: AudioBuffer -> IO AudioTime++foreign import javascript safe+  "$1.numberOfChannels"+  js_bufferNumChannels :: AudioBuffer -> IO Int++foreign import javascript safe+  "$1.inputBuffer"+  js_apeInputBuffer :: JSVal -> IO AudioBuffer++foreign import javascript safe+  "$1.outputBuffer"+  js_apeOutputBuffer :: JSVal -> IO AudioBuffer

@@ -0,0 +1,142 @@+{-# LANGUAGE FlexibleInstances, JavaScriptFFI #-}++module Sound.MusicW.AudioContext where++import GHCJS.DOM.Types (js_eq)+import GHCJS.Types+import GHCJS.Marshal.Pure+import Data.Text+import Data.Time+import Control.Monad.IO.Class+import Control.Monad.Trans.Reader++type AudioTime = Double++newtype AudioContext = AudioContext JSVal++instance PToJSVal AudioContext where pToJSVal (AudioContext val) = val++instance PFromJSVal AudioContext where pFromJSVal = AudioContext++data AudioContextState = ACRunning | ACSuspended | ACClosed deriving (Show, Eq)++instance PToJSVal AudioContextState where+  pToJSVal ACRunning = js_acRunning+  pToJSVal ACSuspended = js_acSuspended+  pToJSVal ACClosed = js_acClosed++instance PFromJSVal AudioContextState where+  pFromJSVal x | x `js_eq` js_acRunning = ACRunning+  pFromJSVal x | x `js_eq` js_acSuspended = ACSuspended+  pFromJSVal x | x `js_eq` js_acClosed = ACClosed++foreign import javascript unsafe "\"running\"" js_acRunning :: JSVal+foreign import javascript unsafe "\"suspended\"" js_acSuspended :: JSVal+foreign import javascript unsafe "\"closed\"" js_acClosed :: JSVal++foreign import javascript safe+  "new (window.AudioContext || window.webkitAudioContext)()"+  newAudioContext :: IO AudioContext++foreign import javascript unsafe+  "window.___ac = $1;"+  setGlobalAudioContext :: AudioContext -> IO ()++foreign import javascript safe+  "if (window.___ac == null) { \+  \    window.___ac = new (window.AudioContext || window.webkitAudioContext)();\+  \} $r = window.___ac;"+  getGlobalAudioContext :: IO AudioContext++foreign import javascript unsafe+  "$1.currentTime"+  getAudioTime :: AudioContext -> IO AudioTime++-- State management functions, both a sync and async version++foreign import javascript unsafe+  "$1.state"+  js_getState :: AudioContext -> IO JSVal++getState :: AudioContext -> IO AudioContextState+getState ac = pFromJSVal <$> js_getState ac++foreign import javascript interruptible+  "$1.resume().then($c)['catch'](function(e){$c(''+e);});" -- ffi parser treats 'catch' as keyword even in id ctx+  js_resumeSync :: AudioContext -> IO JSVal++foreign import javascript unsafe+  "$1.resume();"+  resume :: AudioContext -> IO ()++resumeSync :: AudioContext -> IO (Maybe Text)+resumeSync ac = pFromJSVal <$> js_resumeSync ac++foreign import javascript interruptible+  "$1.suspend().then($c)['catch'](function(e){$c(''+e);});"+  js_suspendSync :: AudioContext -> IO JSVal++foreign import javascript unsafe+  "$1.suspend();"+  suspend :: AudioContext -> IO ()++suspendSync :: AudioContext -> IO (Maybe Text)+suspendSync ac = pFromJSVal <$> js_suspendSync ac++foreign import javascript interruptible+  "$1.close().then($c)['catch'](function(e){$c(''+e);});"+  js_closeSync :: AudioContext -> IO JSVal++foreign import javascript unsafe+  "$1.close();"+  close :: AudioContext -> IO ()++closeSync :: AudioContext -> IO (Maybe Text)+closeSync ac = pFromJSVal <$> js_closeSync ac++foreign import javascript unsafe+  "$1.sampleRate"+  getSampleRate :: AudioContext -> IO Double++foreign import javascript unsafe+  "$1.destination"+  getDestination :: AudioContext -> IO JSVal++class (MonadIO m) => AudioIO m where+  audioContext :: m AudioContext++audioTime :: AudioIO m => m AudioTime+audioTime = audioContext >>= liftIO . getAudioTime++sampleRate :: AudioIO m => m Double+sampleRate = audioContext >>= liftIO . getSampleRate++destination :: AudioIO m => m JSVal -- TODO: not crazy about the JSVal return type here...+destination = audioContext >>= liftIO . getDestination++type AudioContextIO = ReaderT AudioContext IO++instance AudioIO AudioContextIO where+  audioContext = ask++runAudioContextIO :: AudioContext -> AudioContextIO a -> IO a+runAudioContextIO ac acio = (runReaderT acio) ac++liftAudioIO :: MonadIO m => AudioContextIO a -> m a+liftAudioIO x = do+  ac <- liftIO $ getGlobalAudioContext+  liftIO $ runAudioContextIO ac x++-- | Utility functions++dbamp :: Double -> Double+dbamp x = 10.0 ** (x / 20.0)++ampdb :: Double -> Double+ampdb x = 20.0 * (logBase 10 x)++midicps :: Double -> Double+midicps x = 440.0 * (2.0 ** ((x - 69.0) / 12.0))++cpsmidi :: Double -> Double+cpsmidi x = 69.0 + 12.0 * (logBase 2 (x / 440.0))

@@ -0,0 +1,99 @@+module Sound.MusicW.Buffer (+  Buffer(..),+  BufferStatus(..),+  bufferStatus,+  createBuffer,+  startLoadingAndDecodingWithCallback,+  js_getAudioBuffer,+  js_createBufferFromURL,+  js_startLoadingAndDecodingMultiple,+  isBufferLoaded+) where++import Control.Monad.IO.Class+import Control.Monad (forM,liftM)+import Data.Map+import Data.JSString(JSString, unpack)++import GHCJS.DOM.File+import GHCJS.Types+import GHCJS.Marshal.Pure+import GHCJS.Marshal.Internal+import GHCJS.Foreign.Callback++import Sound.MusicW.AudioContext+import Sound.MusicW.AudioBuffer++newtype Buffer = Buffer JSVal++instance Show Buffer where show _ = "a Buffer"++instance PToJSVal Buffer where pToJSVal (Buffer val) = val++instance ToJSVal Buffer where toJSVal (Buffer v) = return v+-- instance ToJSVal [Buffer] where toJSVal bufs= toJSValListOf++  --  toJSValListOf :: [a] -> IO JSVal++data BufferStatus+  = BufferUnderspecified+  | BufferLoading+  | BufferError String+  | BufferLoaded AudioBuffer++isBufferLoaded :: BufferStatus -> Bool+isBufferLoaded (BufferLoaded _) = True+isBufferLoaded _ = False++bufferStatus :: Buffer -> IO (Maybe BufferStatus)+bufferStatus buffer = do+  rawStatus <- js_getBufferStatus buffer+  case unpack rawStatus of+    "loading" -> return $ Just BufferLoading+    "decoding" -> return $ Just BufferLoading+    "error" -> do+      err <- js_getBufferError buffer+      return $ Just $ BufferError $ unpack err+    "decoded" -> do+      audioBuffer <- js_getAudioBuffer buffer+      return $ Just $ BufferLoaded audioBuffer+    otherwise -> return Nothing++createBuffer :: File -> IO Buffer+createBuffer file = do+  ctx <- getGlobalAudioContext+  js_createBuffer file ctx++startLoadingAndDecodingWithCallback :: Buffer -> (Buffer -> IO ()) -> IO ()+startLoadingAndDecodingWithCallback buffer evTrigger = do+  cb <- asyncCallback1 $ \buf -> evTrigger (Buffer buf)+  js_startLoadingAndDecoding buffer cb+  releaseCallback cb++foreign import javascript safe+  "new Buffer($1, $2)"+  js_createBuffer :: File -> AudioContext -> IO Buffer++foreign import javascript safe+  "new Buffer($1, $2)"+  js_createBufferFromURL :: JSString -> AudioContext -> IO Buffer++foreign import javascript safe+  "$1.startLoadingAndDecoding($2);"+  js_startLoadingAndDecoding :: Buffer -> Callback (JSVal -> IO ()) -> IO ()+  --                                                 ^ actually Buffer+foreign import javascript safe+  "startLoadingAndDecodingMultiple($1, $2)"+  js_startLoadingAndDecodingMultiple:: JSVal -> Callback (JSVal -> IO ()) -> IO ()++foreign import javascript safe+  "$1.status"+  js_getBufferStatus :: Buffer -> IO JSString++foreign import javascript safe+  "$1.error"+  js_getBufferError :: Buffer -> IO JSString++foreign import javascript safe+  "$1.buffer"+  js_getAudioBuffer :: Buffer -> IO AudioBuffer

@@ -0,0 +1,26 @@+module Sound.MusicW.Envelopes where++import Sound.MusicW.AudioContext+import Sound.MusicW.Node+import Sound.MusicW.SynthDef++ampEnv :: AudioIO m => AudioTime -> AudioTime -> Double -> AudioTime -> AudioTime -> NodeRef -> SynthDef m NodeRef+ampEnv a d s st r input = do+  g <- gain 0.0 input+  linearRampOnParam Gain 1.0 a g+  exponentialRampOnParam Gain s (a+d) g+  setParam Gain s (a+d+st) g+  linearRampOnParam Gain 0.0 (a+d+st+r) g++asr :: AudioIO m => AudioTime -> AudioTime -> AudioTime -> Double -> NodeRef -> SynthDef m NodeRef+asr a s r amp input = do+  g <- gain 0.0 input+  linearRampOnParam Gain amp a g+  setParam Gain amp (a+s) g+  linearRampOnParam Gain 0 (a+s+r) g++rectEnv :: AudioIO m => AudioTime -> AudioTime -> Double -> NodeRef -> SynthDef m NodeRef+rectEnv ar s amp = asr ar s ar amp++unitRectEnv :: AudioIO m => AudioTime-> AudioTime -> NodeRef -> SynthDef m NodeRef+unitRectEnv ar s = asr ar s ar 1

@@ -0,0 +1,57 @@+{-# LANGUAGE CPP #-}+module Sound.MusicW.FloatArraySpec (+  FloatArraySpec(..),+  arraySpecMap,+  arraySpecSize,+  listToArraySpec+) where++#if MIN_VERSION_base(4,9,0)+import Data.Semigroup as Semi+#endif+#if !(MIN_VERSION_base(4,8,0))+import Data.Monoid+#endif++data FloatArraySpec+  = EmptyArray+  | Const Int Double FloatArraySpec+  | Segment [Double] FloatArraySpec+  | Repeated Int [Double] FloatArraySpec+  deriving (Show)++mappendFloatArraySpec :: FloatArraySpec -> FloatArraySpec -> FloatArraySpec+mappendFloatArraySpec EmptyArray x = x+mappendFloatArraySpec x EmptyArray = x+mappendFloatArraySpec (Const i x tl) y = Const i x $ mappendFloatArraySpec tl y+mappendFloatArraySpec (Segment xs tl) y = Segment xs $ mappendFloatArraySpec tl y+mappendFloatArraySpec (Repeated i xs tl) y = Repeated i xs $ mappendFloatArraySpec tl y++#if MIN_VERSION_base(4,9,0)+instance Semi.Semigroup FloatArraySpec where+  (<>) = mappendFloatArraySpec+#endif++instance Monoid FloatArraySpec where+  mempty = EmptyArray+#if MIN_VERSION_base(4,11,0)+#elif MIN_VERSION_base(4,9,0)+  mappend = (Semi.<>)+#else+  mappend = mappendFloatArraySpec+#endif++arraySpecMap :: (Double -> Double) -> FloatArraySpec -> FloatArraySpec+arraySpecMap _ EmptyArray = EmptyArray+arraySpecMap f (Const i x tl)= Const i (f x) $ arraySpecMap f tl+arraySpecMap f (Segment xs tl) = Segment (fmap f xs) $ arraySpecMap f tl+arraySpecMap f (Repeated i xs tl) = Repeated i (fmap f xs) $ arraySpecMap f tl++arraySpecSize :: FloatArraySpec -> Int+arraySpecSize EmptyArray = 0+arraySpecSize (Const i _ tl) = i + arraySpecSize tl+arraySpecSize (Segment xs tl) = (length xs) + arraySpecSize tl+arraySpecSize (Repeated i xs tl) = (i * (length xs)) + arraySpecSize tl++listToArraySpec :: [Double] -> FloatArraySpec+listToArraySpec xs = Segment xs EmptyArray

@@ -0,0 +1,478 @@+{-# LANGUAGE JavaScriptFFI #-}+module Sound.MusicW.Node where++import GHCJS.Types+import GHCJS.Marshal.Pure+import GHCJS.Prim (toJSArray,toJSString)+import GHCJS.Foreign.Callback(Callback, asyncCallback1, releaseCallback)+import Control.Monad.IO.Class++import Sound.MusicW.AudioContext+import Sound.MusicW.AudioBuffer+import Sound.MusicW.FloatArraySpec++-- | A Node is an instantiated and wrapped node from the Web Audio API, or it is+-- a settable parameter of such a node. Nodes can potentially be connected and+-- disconnected to/from each other, started, stopped, and can have values/ramps/curves+-- scheduled on their parameters.++newtype Node = Node JSVal++instance PToJSVal Node where pToJSVal (Node j) = j++instance PFromJSVal Node where pFromJSVal = Node++instance Show Node where show _ = "a Node"++data ParamType+  = Frequency+  | Gain+  | Q+  | DelayTime+  | Threshold+  | Knee+  | CompressionRatio+  | Attack+  | Release+  -- obviously more are needed here...++instance Show ParamType where+  show Frequency = "frequency"+  show Gain = "gain"+  show Q = "Q"+  show DelayTime = "delayTime"+  show Threshold = "threshold"+  show Knee = "knee"+  show CompressionRatio = "ratio"+  show Attack = "attack"+  show Release = "release"++createConstantSource :: AudioIO m => Double -> m Node+createConstantSource v = do+  ctx <- audioContext+  node <- liftIO $ js_createConstantSource ctx+  liftIO $ js_setConstantOffset node v+  setNodeField node "isSource" True+  setNodeField node "isSink" False+  setNodeField node "startable" True++data OscillatorType+  = Sine+  | Square+  | Sawtooth+  | Triangle+  deriving (Show, Eq)++instance PToJSVal OscillatorType where+  pToJSVal Sine = pToJSVal "sine"+  pToJSVal Square = pToJSVal "square"+  pToJSVal Sawtooth = pToJSVal "sawtooth"+  pToJSVal Triangle = pToJSVal "triangle"++createOscillator :: AudioIO m => OscillatorType -> Double -> m Node+createOscillator t f = do+  ctx <- audioContext+  node <- liftIO $ js_createOscillator ctx+  setNodeField node "type" t+  setFrequency node f+  setNodeField node "isSource" True+  setNodeField node "isSink" False+  temp <- setNodeField node "startable" True+  return temp++data BufferParams = BufferParams Double Double Bool deriving (Show, Eq)++createAudioBufferSource :: AudioIO m => AudioBuffer -> BufferParams -> m Node+createAudioBufferSource buf params@(BufferParams loopstart loopend loop) = do+  ctx <- audioContext+  node <- liftIO $ js_createBufferSource ctx+  setNodeField node "buffer" buf+  setNodeField node "loopstart" loopstart+  setNodeField node "loopend" loopend+  setNodeField node "loop" loop+  setNodeField node "isSource" True+  setNodeField node "isSink" False+  setNodeField node "startable" True++data FilterSpec -- first argument always frequency, second argument when two is q or gain, when three: frequency q gain+  = LowPass Double Double+  | HighPass Double Double+  | BandPass Double Double+  | LowShelf Double Double+  | HighShelf Double Double+  | Peaking Double Double Double+  | Notch Double Double+  | AllPass Double Double+  deriving (Show)++-- temp note: filter types: LowPass, HighPass, BandPass,LowShelf,HighShelf,Peaking,Notch,AllPass+createBiquadFilter :: AudioIO m => FilterSpec -> m Node+createBiquadFilter spec = do+  ctx <- audioContext+  node <- liftIO $ js_createBiquadFilter ctx+  configureBiquadFilter spec node+  setNodeField node "isSource" True+  setNodeField node "isSink" True+  setNodeField node "startable" False++configureBiquadFilter :: AudioIO m => FilterSpec -> Node -> m Node+configureBiquadFilter (LowPass f q) n = setNodeField n "type" "lowpass" >> setFrequency n f >> setQ n q+configureBiquadFilter (HighPass f q) n = setNodeField n "type" "highpass" >> setFrequency n f >> setQ n q+configureBiquadFilter (BandPass f q) n = setNodeField n "type" "bandpass" >> setFrequency n f >> setQ n q+configureBiquadFilter (LowShelf f g) n = setNodeField n "type" "lowshelf" >> setFrequency n f >> setGain n g+configureBiquadFilter (HighShelf f g) n = setNodeField n "type" "highshelf" >> setFrequency n f >> setGain n g+configureBiquadFilter (Peaking f q g) n = setNodeField n "type" "peaking" >> setFrequency n f >> setQ n q >> setGain n g+configureBiquadFilter (Notch f q) n = setNodeField n "type" "notch" >> setFrequency n f >> setQ n q+configureBiquadFilter (AllPass f q) n = setNodeField n "type" "allpass" >> setFrequency n f >> setQ n q++createConvolver :: AudioIO m => Either Float32Array FloatArraySpec -> Bool -> m Node+createConvolver bufferSpec normalize = do+  ctx <- audioContext+  node <- liftIO $ js_createConvolver ctx+  sr <- sampleRate+  bufferData <- liftIO $ instantiateArraySpec bufferSpec+  nSamples <- liftIO $ js_typedArrayLength bufferData+  buffer <- liftIO $ js_createAudioBuffer 1 nSamples sr ctx -- TODO (?) use a buffer spec instead of array spec (???)+  liftIO $ js_copyToChannel bufferData 1 buffer+  setNodeField node "buffer" buffer+  setNodeField node "normalize" normalize+  setNodeField node "isSource" True+  setNodeField node "isSink" True+  setNodeField node "startable" False++createDelay :: AudioIO m => AudioTime -> m Node+createDelay maxT = do+  ctx <- audioContext+  node <- liftIO $ js_createDelay ctx maxT+  setValue node DelayTime maxT+  setNodeField node "isSource" True+  setNodeField node "isSink" True+  setNodeField node "startable" False++createCompressor :: AudioIO m => Double -> Double -> Double -> AudioTime -> AudioTime -> m Node+createCompressor thr kne rat att rel = do+  ctx <- audioContext+  node <- liftIO $ js_createDynamicsCompressor ctx+  setValue node Threshold thr+  setValue node Knee kne+  setValue node CompressionRatio rat+  setValue node Attack att+  setValue node Release rel+  setNodeField node "isSource" True+  setNodeField node "isSink" True+  setNodeField node "startable" False++createGain :: AudioIO m => Double -> m Node+createGain g = do+  ctx <- audioContext+  node <- liftIO $ js_createGain ctx+  setValue node Gain g+  setNodeField node "isSource" True+  setNodeField node "isSink" True+  setNodeField node "startable" False++createChannelMerger :: AudioIO m => Int -> m Node+createChannelMerger nChnls = do+  ctx <- audioContext+  node <- liftIO $ js_createChannelMerger ctx nChnls+  setNodeField node "isSource" True+  setNodeField node "isSink" True+  setNodeField node "startable" False++data OversampleAmount+  = NoOversampling+  | X2Oversampling+  | X4Oversampling+  deriving (Show)++instance PToJSVal OversampleAmount where+  pToJSVal NoOversampling = pToJSVal "none"+  pToJSVal X2Oversampling = pToJSVal "x2"+  pToJSVal X4Oversampling = pToJSVal "x4"++createWaveShaper :: AudioIO m => Either Float32Array FloatArraySpec -> OversampleAmount -> m Node+createWaveShaper curve oversample = do+  ctx <- audioContext+  node <- liftIO $ js_createWaveShaper ctx+  curveArray <- liftIO $ instantiateArraySpec curve+  setNodeField node "curve" curveArray+  setNodeField node "oversample" oversample+  setNodeField node "isSource" True+  setNodeField node "isSink" True+  setNodeField node "startable" False++createScriptProcessor :: AudioIO m => Int -> Int -> (JSVal -> IO ()) -> m Node+createScriptProcessor inChnls outChnls cb = do+  ctx <- audioContext+  node <- liftIO $ js_createScriptProcessor ctx inChnls outChnls+  onaudioprocess <- liftIO $ asyncCallback1 cb+  liftIO $ js_onaudioprocess node onaudioprocess+  liftIO $ releaseCallback onaudioprocess+  setNodeField node "isSource" True+  setNodeField node "isSink" True+  setNodeField node "startable" True++-- | There is no function in the Web Audio API to "create" the context's+-- destination but we provide one anyway, as a convenient way to get a node+-- that, like all the other nodes, can be used in connections.++createDestination :: AudioIO m => m Node+createDestination = do+  node <- Node <$> destination+  setNodeField node "isSource" False+  setNodeField node "isSink" True+  setNodeField node "startable" False++createMediaStreamDestination :: AudioIO m => m Node+createMediaStreamDestination = do+  ctx <- audioContext+  node <- liftIO $ js_createMediaStreamDestination ctx+  setNodeField node "isSource" False+  setNodeField node "isSink" True+  setNodeField node "startable" False++getSharedMediaStreamDestination :: AudioIO m => m Node+getSharedMediaStreamDestination = do+  ctx <- audioContext+  node <- liftIO $ js_getContextSharedMediaStreamDestination ctx+  setNodeField node "isSource" False+  setNodeField node "isSink" True+  setNodeField node "startable" False++-- | Similarly, while the control parameters of nodes in the web audio API are distinct+-- we provide a function here to create a pseudo-node from a parameter of an+-- existing node. As with the destination (above), a node parameter, like a node,+-- can be something to which connections are made.++createParameter :: MonadIO m => Node -> ParamType -> m Node+createParameter node pType = do+  let p = Node $ js_audioParam node (pToJSVal $ show pType)+  setNodeField p "isSource" False+  setNodeField p "isSink" True+  setNodeField p "startable" False++connectNodes :: MonadIO m => Node -> Node -> m ()+connectNodes from to+  | not (js_isSource from) = error $ (show from) ++ " can't be connect source."+  | not (js_isSink to) = error $ (show to) ++ " can't be connect target."+  | otherwise   = liftIO $ js_connect from to++connectNodes' :: MonadIO m => Node -> Int -> Node -> Int -> m ()+connectNodes' fromNode fromChannel toNode toChannel+  | not (js_isSource fromNode) = error $ (show fromNode) ++ " can't be connect source."+  | not (js_isSink toNode) = error $ (show toNode) ++ " can't be connect target."+  | otherwise   = liftIO $ js_connect' fromNode toNode fromChannel toChannel++disconnectNodes :: MonadIO m => Node -> Node -> m ()+disconnectNodes from to+  | not (js_isSource from) = error $ (show from) ++ " can't be disconnect source."+  | not (js_isSink to) == False = error $ (show to) ++ " can't be disconnect target."+  | otherwise   = liftIO $ js_disconnect from to++disconnectAll :: MonadIO m => Node -> m ()+disconnectAll x+  | not (js_isSource x) = return ()+  | otherwise  = liftIO $ js_disconnectAll x++startNode :: MonadIO m => AudioTime -> Node -> m ()+startNode t x+  | js_startable x = liftIO $ js_start x t+  | otherwise  = return ()++stopNode :: MonadIO m => AudioTime -> Node -> m ()+stopNode t x+  | js_startable x = liftIO $ js_stop x t+  | otherwise  = return ()++stopNodeNow :: MonadIO m => Node -> m ()+stopNodeNow x+  | js_startable x = liftIO $ js_stopNow x+  | otherwise = return ()++isSourceNode :: Node -> Bool+isSourceNode n = js_isSource n && (not $ js_isSink n)++isSinkNode :: Node -> Bool+isSinkNode n = js_isSink n && (not $ js_isSource n)+++-- Definitions used to set/schedule the values of fields and parameters of nodes++setNodeField :: (MonadIO m, PToJSVal a) => Node -> String -> a -> m Node+setNodeField node field val = do+  liftIO $ js_setField (pToJSVal node) (pToJSVal field) (pToJSVal val)+  return node++setFrequency :: AudioIO m => Node -> Double -> m Node+setFrequency node = setValue node Frequency++setGain :: AudioIO m => Node -> Double -> m Node+setGain node = setValue node Gain++setQ :: AudioIO m => Node -> Double -> m Node+setQ node = setValue node Q++setValue :: AudioIO m => Node -> ParamType -> Double -> m Node+setValue node pType value = audioTime >>= setValueAtTime node pType value++setValueAtTime :: MonadIO m => Node -> ParamType -> Double -> AudioTime -> m Node+setValueAtTime node pType value time = do+  liftIO $ js_setValueAtTime node (pToJSVal $ show pType) value time+  return node++linearRampToValueAtTime :: MonadIO m => Node -> ParamType -> Double -> AudioTime -> m Node+linearRampToValueAtTime node pType value time = do+  liftIO $ js_linearRampToValueAtTime node (pToJSVal $ show pType) value time+  return node++exponentialRampToValueAtTime :: MonadIO m => Node -> ParamType -> Double -> AudioTime -> m Node+exponentialRampToValueAtTime node pType value time = do+  liftIO $ js_exponentialRampToValueAtTime node (pToJSVal $ show pType) value time+  return node++setValueCurveAtTime :: MonadIO m => Node -> ParamType -> [Double] -> AudioTime -> AudioTime -> m Node+setValueCurveAtTime node pType curve startTime duration = do+  curveArray <- liftIO $ toJSArray $ fmap pToJSVal curve+  typedCurveArray <- liftIO $ js_typedArrayFromArray curveArray+  liftIO $ js_setValueCurveAtTime node (pToJSVal $ show pType) typedCurveArray startTime duration+  return node++onended :: Node -> (JSVal -> IO ()) -> IO ()+onended n cb = do+  let n' = pToJSVal n+  onend <- asyncCallback1 $ \_ -> cb n'+  js_onended n onend+  releaseCallback onend+++-- JS FFI functions (required, but not exported from this module):++foreign import javascript unsafe+  "$1.createConstantSource()"+  js_createConstantSource :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.createOscillator()"+  js_createOscillator :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.createBufferSource()"+  js_createBufferSource :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.createBiquadFilter()"+  js_createBiquadFilter :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.createConvolver()"+  js_createConvolver :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.createDelay($2)"+  js_createDelay :: AudioContext -> AudioTime -> IO Node++foreign import javascript unsafe+  "$1.createDynamicsCompressor()"+  js_createDynamicsCompressor :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.createGain()"+  js_createGain :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.createChannelMerger($2)"+  js_createChannelMerger :: AudioContext -> Int -> IO Node++foreign import javascript unsafe+  "$1.createWaveShaper()"+  js_createWaveShaper :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.createScriptProcessor(void 0, $2, $3)"+  js_createScriptProcessor :: AudioContext -> Int -> Int -> IO Node++foreign import javascript unsafe+  "$1.createMediaStreamDestination()"+  js_createMediaStreamDestination :: AudioContext -> IO Node++foreign import javascript unsafe+  "if ($1.___stream == null) {\+  \  $1.___stream = $1.createMediaStreamDestination(); \+  \} $r = $1.___stream;"+  js_getContextSharedMediaStreamDestination :: AudioContext -> IO Node++foreign import javascript unsafe+  "$1.connect($2);"+  js_connect :: Node -> Node -> IO ()++foreign import javascript unsafe+  "$1.connect($2,$3,$4);"+  js_connect' :: Node -> Node -> Int -> Int -> IO ()++foreign import javascript unsafe+  "$1.disconnect($2);"+  js_disconnect :: Node -> Node -> IO ()++foreign import javascript unsafe+  "$1.disconnect();"+  js_disconnectAll :: Node -> IO ()++foreign import javascript unsafe+  "$1.start($2);"+  js_start :: Node -> AudioTime -> IO ()++foreign import javascript unsafe+  "$1.stop($2);"+  js_stop :: Node -> AudioTime -> IO ()++foreign import javascript unsafe+  "$1.stop();"+  js_stopNow :: Node -> IO ()++foreign import javascript unsafe+  "$1.onaudioprocess = $2;"+  js_onaudioprocess :: Node -> Callback (JSVal -> IO ()) -> IO ()++foreign import javascript unsafe+  "$1[$2].setValueAtTime($3, $4);"+  js_setValueAtTime :: Node -> JSVal -> Double -> Double -> IO ()++foreign import javascript unsafe+  "$1[$2].linearRampToValueAtTime($3, $4);"+  js_linearRampToValueAtTime :: Node -> JSVal -> Double -> AudioTime -> IO ()++foreign import javascript unsafe+  "$1[$2].exponentialRampToValueAtTime($3, $4);"+  js_exponentialRampToValueAtTime :: Node -> JSVal -> Double -> AudioTime -> IO ()++foreign import javascript unsafe+  "$1[$2].setValueCurveAtTime($3, $4, $5);"+  js_setValueCurveAtTime :: Node -> JSVal -> Float32Array -> Double -> AudioTime -> IO ()++foreign import javascript unsafe+  "$1[$2] = $3;"+  js_setField :: JSVal -> JSVal -> JSVal -> IO ()++foreign import javascript unsafe+  "$1.offset.value = $2"+  js_setConstantOffset :: Node -> Double -> IO ()++foreign import javascript unsafe+  "$1[$2]"+  js_audioParam :: Node -> JSVal -> JSVal++foreign import javascript unsafe+  "$1.onended = $2;"+  js_onended :: Node -> Callback (JSVal -> IO ()) -> IO ()++foreign import javascript unsafe+  "$1.isSource"+  js_isSource :: Node -> Bool++foreign import javascript unsafe+  "$1.isSink"+  js_isSink :: Node -> Bool++foreign import javascript unsafe+  "$1.startable"+  js_startable :: Node -> Bool

@@ -0,0 +1,109 @@+module Sound.MusicW.Synth (+  Synth(..),+  playSynth,+  playSynthNow,+  nodeRefToNode,+  synthDefToSynth,+  synthDefToSynth_,+  startSynth,+  startSynthNow,+  stopSynth,+  stopSynthNow,+  disconnectSynth,+  restartSynth+  ) where++import Data.Foldable (find)+import Control.Monad (void)+import Control.Monad.IO.Class++import Sound.MusicW.AudioContext+import Sound.MusicW.Node+import Sound.MusicW.SynthDef++data Synth m = Synth {+  cachedDestination :: Node,+  spec :: SynthSpec m,+  nodes :: [Node]+  --audioBuffers :: Map Int AudioBuffer, -- TODO restarting a AudioBufferSourceNode needs to replace the buffers+  } deriving (Show)++playSynth :: AudioIO m => Node -> AudioTime -> SynthDef m a -> m (a, Synth m)+playSynth dest t x = do+  (a,spec) <- runSynthDef x+  s <- synthSpecToSynth dest spec+  startSynth t s+  return (a,s)++playSynthNow :: AudioIO m => Node -> SynthDef m a -> m (a, Synth m)+playSynthNow dest x = do+  (a,spec) <- runSynthDef x+  s <- synthSpecToSynth dest spec+  startSynthNow s+  return (a,s)++nodeRefToNode :: AudioIO m => NodeRef -> Synth m -> m Node+nodeRefToNode (NodeRef i (_,_)) s = return $ (nodes s)!!i+nodeRefToNode (ParamRef i pType) s = createParameter ((nodes s)!!i) pType+nodeRefToNode DestinationRef s = return $ cachedDestination s++synthDefToSynth :: AudioIO m => Node -> SynthDef m a -> m (Synth m)+synthDefToSynth dest x = execSynthDef x >>= synthSpecToSynth dest++synthDefToSynth_ :: AudioIO m => SynthDef m a -> m (Synth m)+synthDefToSynth_ x = createDestination >>= (flip synthDefToSynth) x++synthSpecToSynth :: AudioIO m => Node -> SynthSpec m -> m (Synth m)+synthSpecToSynth dest x = do+  ns <- sequence $ nodeBuilders x+  mapM_ (uncurry (makeConnections dest ns)) $ connections x+  disconnectOnStop ns+  return $ Synth { cachedDestination = dest, spec = x, nodes = ns }++makeConnections :: AudioIO m => Node -> [Node] -> NodeRef -> NodeRef -> m ()+makeConnections dest ns (NodeRef from (_,_)) DestinationRef = connectNodes (ns!!from) dest+makeConnections _ ns (NodeRef from (_,_)) (NodeRef to (_,_)) = connectNodes (ns!!from) (ns!!to)+makeConnections _ ns (NodeRef from (_,_)) (ParamRef to pType) = createParameter (ns!!to) pType >>= connectNodes (ns!!from)+makeConnections _ ns (NodeOutputRef fromNode fromChannel) (NodeInputRef toNode toChannel) = connectNodes' (ns!!fromNode) fromChannel (ns!!toNode) toChannel+makeConnections _ _ _ _ = error "Malformed graph structure."++-- *** Note: there is probably a bug connected to the definition of disconnectOnStop below:+-- it attaches an onended callback to a single source node from a list of nodes, which doesn't+-- properly cover the case where there are multiple source nodes that end at different times.++disconnectOnStop :: (Foldable t, AudioIO m) => t Node -> m ()+disconnectOnStop ns = maybe (return ()) f $ find isSourceNode ns+  where f x = liftIO $ onended x $ \_ -> mapM_ disconnectAll ns++startSynth :: AudioIO m => AudioTime -> Synth m -> m ()+startSynth t0 s = do+  mapM_ (startNode t0) $ nodes s+  maybe (return ()) (\t -> stopSynth (t0+t) s) $ deletionTime (spec s)+  mapM_ (scheduleChange (nodes s) t0) $ changes (spec s)++scheduleChange :: AudioIO m => [Node] -> AudioTime -> Change -> m ()+scheduleChange ns t0 (SetValue (ParamRef i pType) v t) = void $ setValueAtTime (ns!!i) pType v (t0+t)+scheduleChange ns t0 (LinearRampToValue (ParamRef i pType) v t) = void $ linearRampToValueAtTime (ns!!i) pType v (t0+t)+scheduleChange ns t0 (ExponentialRampToValue (ParamRef i pType) v t) = void $ exponentialRampToValueAtTime (ns!!i) pType v (t0+t)+scheduleChange ns t0 (CurveToValue (ParamRef i pType) curve t dur) = void $ setValueCurveAtTime (ns!!i) pType curve (t0+t) dur+scheduleChange _ _ _ = error "scheduleChange targeted non-ParamRef node"++startSynthNow :: AudioIO m => Synth m -> m ()+startSynthNow s = do+  t <- audioTime+  startSynth (t + 0.050) s++stopSynth :: MonadIO m => AudioTime -> Synth m -> m ()+stopSynth t s = mapM_ (stopNode t) $ nodes s++stopSynthNow :: MonadIO m => Synth m -> IO ()+stopSynthNow s = mapM_ stopNodeNow $ nodes s++disconnectSynth :: MonadIO m => Synth m -> IO ()+disconnectSynth s = mapM_ disconnectAll $ nodes s++restartSynth :: AudioIO m => AudioTime -> Synth m -> m ()+restartSynth t s = do+  stopSynth t s+  s' <- synthSpecToSynth (cachedDestination s) (spec s)+  startSynth t s'

@@ -0,0 +1,214 @@+module Sound.MusicW.SynthDef where++import Control.Monad.State+import GHCJS.Types++import Sound.MusicW.AudioContext+import Sound.MusicW.FloatArraySpec+import Sound.MusicW.AudioBuffer+import Sound.MusicW.Node++data NodeRef+  = NodeRef Int (Int,Int) -- tuplet is number of input and output channels for this node+  | NodeInputRef Int Int -- for a numbered node, a specific numbered input of that node+  | NodeOutputRef Int Int -- for a numbered node, a specific numbered input of that node+  | ParamRef Int ParamType+  | DestinationRef+  deriving (Show)++nodeRefInputCount :: NodeRef -> Int+nodeRefInputCount (NodeRef _ (i,_)) = i+nodeRefInputCount (NodeInputRef _ _) = 1+nodeRefInputCount (NodeOutputRef _ _) = 0+nodeRefInputCount (ParamRef _ _) = 1+nodeRefInputCount DestinationRef = 2 -- hard-coding of stereo output here might be problematic or irrelevant...++nodeRefOutputCount :: NodeRef -> Int+nodeRefOutputCount (NodeRef _ (_,o)) = o+nodeRefOutputCount (NodeInputRef _ _) = 0+nodeRefOutputCount (NodeOutputRef _ _) = 1+nodeRefOutputCount (ParamRef _ _) = 0+nodeRefOutputCount DestinationRef = 0++data Change+  = SetValue { paramRef :: NodeRef , value :: Double, endTime :: AudioTime }+  | LinearRampToValue { paramRef :: NodeRef , value :: Double, endTime :: AudioTime }+  | ExponentialRampToValue { paramRef :: NodeRef, value :: Double, endTime :: AudioTime }+  | CurveToValue { paramRef :: NodeRef, values :: [Double], startTime :: AudioTime, duration :: AudioTime }+  deriving (Show)++data SynthSpec m = SynthSpec {+  nodeBuilders :: [m Node],+  connections :: [(NodeRef,NodeRef)],+  changes :: [Change],+  deletionTime :: Maybe AudioTime+  }++instance Show (SynthSpec m) where+  show x = show (length $ nodeBuilders x) ++ " nodes, connections=" ++ show (connections x)+    ++ ", changes=" ++ show (changes x) ++ ", deletionTime=" ++ show (deletionTime x)++emptySynthSpec :: SynthSpec m+emptySynthSpec = SynthSpec {+  nodeBuilders = [],+  connections = [],+  changes = [],+  deletionTime = Nothing+  }++type SynthDef m a = StateT (SynthSpec m) m a++execSynthDef :: AudioIO m => SynthDef m a -> m (SynthSpec m)+execSynthDef x = execStateT x emptySynthSpec++runSynthDef :: AudioIO m => SynthDef m a -> m (a, SynthSpec m)+runSynthDef x = runStateT x emptySynthSpec++addNodeBuilder :: Monad m => (Int,Int) -> m Node -> SynthDef m NodeRef+addNodeBuilder (iCount,oCount) x = do+  indexOfNewNode <- gets (length . nodeBuilders)+  modify $ \s -> s { nodeBuilders = nodeBuilders s ++ [x] }+  return $ NodeRef indexOfNewNode (iCount,oCount)++connect :: Monad m => NodeRef -> NodeRef -> SynthDef m ()+connect from to = modify $ \s -> s { connections = connections s ++ [(from,to)] }++connect' :: Monad m => NodeRef -> Int -> NodeRef -> Int -> SynthDef m ()+connect' (NodeRef fromNode (_,_)) fromIndex (NodeRef toNode (_,_)) toIndex = connect (NodeOutputRef fromNode fromIndex) (NodeInputRef toNode toIndex)+connect' _ _ _ _ = error "unsupported connection type in connect'"++addChange :: Monad m => Change -> SynthDef m ()+addChange x = modify $ \s -> s { changes = changes s ++ [x] }++setDeletionTime :: Monad m => Maybe AudioTime -> SynthDef m ()+setDeletionTime t = modify $ \s -> s { deletionTime = combineDeletionTimes (deletionTime s) t }++combineDeletionTimes :: Maybe AudioTime -> Maybe AudioTime -> Maybe AudioTime+combineDeletionTimes Nothing Nothing = Nothing+combineDeletionTimes (Just t) Nothing = Just t+combineDeletionTimes Nothing (Just t) = Just t+combineDeletionTimes (Just t1) (Just t2) = Just (max t1 t2)+++-- definitions for nodes that are only sources (no NodeRefs as arguments)++constantSource :: AudioIO m => Double -> SynthDef m NodeRef+constantSource x = addNodeBuilder (0,1) $ createConstantSource x++oscillator :: AudioIO m => OscillatorType -> Double -> SynthDef m NodeRef+oscillator t f = addNodeBuilder (0,1) $ createOscillator t f++audioBufferSource :: AudioIO m => AudioBuffer -> BufferParams -> SynthDef m NodeRef+audioBufferSource buf ps = addNodeBuilder (0,1) $ createAudioBufferSource buf ps -- *** hard-coding of 1 output channel could become problematic++-- for the following definitions, relating to nodes that are sinks, the penultimate+-- type for each is a NodeRef, so that Synth computations can be chained together+-- (x >>= y >>= z) in such a way that the node of x becomes an input to y, whose node+-- becomes an input to z.++biquadFilter :: AudioIO m => FilterSpec -> NodeRef -> SynthDef m NodeRef+biquadFilter x input = do+  let nchnls = nodeRefOutputCount input+  y <- addNodeBuilder (nchnls,nchnls) $ createBiquadFilter x+  connect input y+  return y++gain :: AudioIO m => Double -> NodeRef -> SynthDef m NodeRef+gain x input = do+  let nchnls = nodeRefOutputCount input+  y <- addNodeBuilder (nchnls,nchnls) $ createGain x+  connect input y+  return y++channelMerger :: AudioIO m => [NodeRef] -> SynthDef m NodeRef+channelMerger xs = do+  y <- addNodeBuilder (length xs,length xs) $ createChannelMerger (length xs)+  zipWithM_ (\x i -> connect' x 0 y i) xs [0..]+  return y++-- note: channelSplitter does not actually create any new synthesis nodes+-- it just turns all of the output channels of a node with outputs into+-- individual node references.+channelSplitter :: AudioIO m => NodeRef -> SynthDef m [NodeRef]+channelSplitter (NodeOutputRef n o) = return [NodeOutputRef n o]+channelSplitter (NodeRef n (_,oChnls)) = return $ fmap (NodeOutputRef n) [0 .. (oChnls-1)]+channelSplitter _ = error "MusicW: channelSplitter called on NodeInputRef ParamRef or DestinationRef"++convolver :: AudioIO m => Either Float32Array FloatArraySpec -> Bool -> NodeRef -> SynthDef m NodeRef+convolver spec normalize input = do+  let nchnls = nodeRefOutputCount input+  y <- addNodeBuilder (nchnls,nchnls) $ createConvolver spec normalize+  connect input y+  return y++delay :: AudioIO m => AudioTime -> NodeRef -> SynthDef m NodeRef+delay maxT input = do+  let nchnls = nodeRefOutputCount input+  y <- addNodeBuilder (nchnls,nchnls) $ createDelay maxT+  connect input y+  return y++compressor :: AudioIO m => Double -> Double -> Double -> AudioTime -> AudioTime -> NodeRef -> SynthDef m NodeRef+compressor thr kne rat att rel input = do+  let nchnls = nodeRefOutputCount input+  y <- addNodeBuilder (nchnls,nchnls) $ createCompressor thr kne rat att rel+  connect input y+  return y++waveShaper :: AudioIO m => Either Float32Array FloatArraySpec -> OversampleAmount -> NodeRef -> SynthDef m NodeRef+waveShaper curve oversample input = do+  let nchnls = nodeRefOutputCount input+  y <- addNodeBuilder (nchnls,nchnls) $ createWaveShaper curve oversample+  connect input y+  return y++scriptProcessor :: AudioIO m => Int -> Int -> (JSVal -> IO ()) -> NodeRef -> SynthDef m NodeRef+scriptProcessor inChnls outChnls cb input = do+  y <- addNodeBuilder (inChnls,outChnls) $ createScriptProcessor inChnls outChnls cb+  connect input y+  return y++audioOut :: AudioIO m => NodeRef -> SynthDef m ()+audioOut input = connect input DestinationRef++audioIn :: AudioIO m => SynthDef m NodeRef+audioIn = addNodeBuilder (0,1) $ createGain 1.0 -- TODO: hard-coded single input channel will be problematic later++resink :: AudioIO m => NodeRef -> NodeRef -> SynthDef m NodeRef+resink target input = connect input target >> return target++mix :: AudioIO m => [NodeRef] -> SynthDef m NodeRef+mix [] = constantSource 0 -- placeholder: we should have some kind of null node that translates into nothing for cases like this+mix (x:xs) = do+  y <- gain 1.0 x+  mapM (\n -> connect n y) xs+  return y++mixSynthDefs :: AudioIO m => [SynthDef m NodeRef] -> SynthDef m NodeRef+mixSynthDefs xs = sequence xs >>= mix++-- The final set of definitions here have to do with either connecting signals+-- to parameters of existing nodes, or setting/scheduling value changes/envelopes+-- on the parameters of existing nodes. The order of arguments is somewhat+-- inconsistent but is intended to facilitate common use cases where these+-- definitions are chained together.++param :: AudioIO m => ParamType -> NodeRef -> NodeRef -> SynthDef m ()+param pType (NodeRef i (_,_)) input = connect input $ ParamRef i pType+param _ _ _ = error "connectParam used with not actual node"++setParam :: AudioIO m => ParamType -> Double -> AudioTime -> NodeRef -> SynthDef m NodeRef+setParam pType v t (NodeRef i (iChnls,oChnls)) = addChange (SetValue (ParamRef i pType) v t) >> return (NodeRef i (iChnls,oChnls))+setParam _ _ _ _ = error "setParam used with not actual node"++linearRampOnParam :: AudioIO m => ParamType -> Double -> AudioTime -> NodeRef -> SynthDef m NodeRef+linearRampOnParam pType v t (NodeRef i (iChnls,oChnls)) = addChange (LinearRampToValue (ParamRef i pType) v t) >> return (NodeRef i (iChnls,oChnls))+linearRampOnParam _ _ _ _ = error "linearRampOnParam used with not actual node"++exponentialRampOnParam :: AudioIO m => ParamType -> Double -> AudioTime -> NodeRef -> SynthDef m NodeRef+exponentialRampOnParam pType v t (NodeRef i (iChnls,oChnls)) = addChange (ExponentialRampToValue (ParamRef i pType) v t) >> return (NodeRef i (iChnls,oChnls))+exponentialRampOnParam _ _ _ _ = error "exponentialRampOnParam used with not actual node"++curveOnParam :: AudioIO m => ParamType -> [Double] -> AudioTime -> AudioTime -> NodeRef -> SynthDef m NodeRef+curveOnParam pType vs t dur (NodeRef i (iChnls,oChnls)) = addChange (CurveToValue (ParamRef i pType) vs t dur) >> return (NodeRef i (iChnls,oChnls))+curveOnParam _ _ _ _ _ = error "curveOnParam used with not actual node"

@@ -0,0 +1,71 @@+module Sound.MusicW.Transformations where++import Control.Monad++import Sound.MusicW.AudioContext+import Sound.MusicW.Node+import Sound.MusicW.SynthDef+import Sound.MusicW.FloatArraySpec++clipAt :: AudioIO m => Double -> NodeRef -> SynthDef m NodeRef+clipAt x input = do+  let nSamples = 65536 :: Int+  let portion = (1.0 - x) / 2.0+  let nConstSamples = floor $ portion * fromIntegral nSamples+  let left = Const (nConstSamples-1) (-x) EmptyArray+  let mid = listToArraySpec [((2.0 * fromIntegral i) / (fromIntegral  nSamples)) - 1 | i <- [nConstSamples..(nSamples-nConstSamples)-1]]+  let right = Const (nConstSamples-1) x EmptyArray+  waveShaper (Right $ mconcat [left, mid, right]) NoOversampling input++-- | A panner not based on the WebAudio API panner node but rather on+-- straightforward equal power paining using two gain nodes.++equalPowerPan :: AudioIO m => Double -> NodeRef -> SynthDef m NodeRef+equalPowerPan x input = do+  left <- gain (gainFromDistance x) input+  right <- gain (gainFromDistance (1-x)) input+  channelMerger [left,right]++gainFromDistance :: Double -> Double+gainFromDistance x | abs x > 1 = 0+gainFromDistance x | otherwise = cos $ abs x * pi / 2++-- | circlePan pans a given single-channel signal around a circle of outputs+-- positions of 0 or 1 pan directly to the first output channel+-- positions between 0 and 1 move through the other outputs++circlePan :: AudioIO m => Int -> Double -> NodeRef -> SynthDef m NodeRef+circlePan 0 _ _ = constantSource 0+circlePan 1 _ input = return input+circlePan n pos input = do+  let pos' = pos - (fromIntegral $ floor pos)+  let pos'' = (fromIntegral n) * pos'+  let gs = fmap (gainFromDistance . ((-) pos'')) $ take n [0..]+  let g0 = gainFromDistance $ pos'' - (fromIntegral n)+  let gs' = (head gs + g0):tail gs -- taking account of "wrap-around"+  xs <- mapM (\x -> gain x input) gs'+  channelMerger xs++-- | splay pans a list of signals by distributing them equally over an array+-- of speakers/outputs. When there are more than 2 outputs (as indicated by first+-- argument) the signals are equidistantly distributed around a "circle" (using+-- circlePan, above) with the first signal in the list at position 0. When there+-- are only 2 outputs, equalPowerPan (above) is used instead, and the signals are+-- panned such that a single signal will be centre panned, two signals will be+-- panned hard left and right, and two or more signals will be distributed so that+-- the first signal is guaranteed to be hard left and the last signal is hard right.++splay :: AudioIO m => Int -> [NodeRef] -> SynthDef m NodeRef+splay n [] = constantSource 0 >>= circlePan n 0+splay 2 (i:[]) = equalPowerPan 0.5 i+splay n (i:[]) = circlePan n 0.5 i+splay 2 inputs = do+  let i = 1/(fromIntegral $ length inputs - 1)+  let positions = fmap ((*) i) $ take (length inputs) [0..]+  xs <- zipWithM equalPowerPan positions inputs+  mix xs+splay n inputs = do+  let i = 1/(fromIntegral $ length inputs)+  let positions = fmap ((*) i) $ take (length inputs) [0..]+  xs <- zipWithM (circlePan n) positions inputs+  mix xs

@@ -0,0 +1,309 @@+{-# LANGUAGE JavaScriptFFI #-}++module Sound.MusicW.Worklets where++import GHCJS.Types+import GHCJS.Prim (toJSString)+import Control.Monad+import Control.Monad.IO.Class++import Sound.MusicW.AudioContext+import Sound.MusicW.Node+import Sound.MusicW.SynthDef++-- note: for any of these functions to work one must have a secure browser context+-- AND one must have called (successfully) addWorklets :: AudioContext -> IO ()++equalWorklet :: AudioIO m => NodeRef -> NodeRef -> SynthDef m NodeRef+equalWorklet in1 in2 = audioWorklet "equal-processor" [in1,in2]++notEqualWorklet :: AudioIO m => NodeRef -> NodeRef -> SynthDef m NodeRef+notEqualWorklet in1 in2 = audioWorklet "notEqual-processor" [in1,in2]++greaterThanWorklet :: AudioIO m => NodeRef -> NodeRef -> SynthDef m NodeRef+greaterThanWorklet in1 in2 = audioWorklet "greaterThan-processor" [in1,in2]++greaterThanOrEqualWorklet :: AudioIO m => NodeRef -> NodeRef -> SynthDef m NodeRef+greaterThanOrEqualWorklet in1 in2 = audioWorklet "greaterThanOrEqual-processor" [in1,in2]++lessThanWorklet :: AudioIO m => NodeRef -> NodeRef -> SynthDef m NodeRef+lessThanWorklet in1 in2 = audioWorklet "lessThan-processor" [in1,in2]++lessThanOrEqualWorklet :: AudioIO m => NodeRef -> NodeRef -> SynthDef m NodeRef+lessThanOrEqualWorklet in1 in2 = audioWorklet "lessThanOrEqual-processor" [in1,in2]++midiCpsWorklet :: AudioIO m => NodeRef -> SynthDef m NodeRef+midiCpsWorklet x = audioWorklet "midiCps-processor" [x]++cpsMidiWorklet :: AudioIO m => NodeRef -> SynthDef m NodeRef+cpsMidiWorklet x = audioWorklet "cpsMidi-processor" [x]++ampDbWorklet :: AudioIO m => NodeRef -> SynthDef m NodeRef+ampDbWorklet x = audioWorklet "ampDb-processor" [x]++dbAmpWorklet :: AudioIO m => NodeRef -> SynthDef m NodeRef+dbAmpWorklet x = audioWorklet "dbAmp-processor" [x]++absWorklet :: AudioIO m => NodeRef -> SynthDef m NodeRef+absWorklet x = audioWorklet "abs-processor" [x]++sqrtWorklet :: AudioIO m => NodeRef -> SynthDef m NodeRef+sqrtWorklet x = audioWorklet "sqrt-processor" [x]++safeDivideWorklet :: AudioIO m => NodeRef -> NodeRef -> SynthDef m NodeRef+safeDivideWorklet in1 in2 = audioWorklet "safeDivide-processor" [in1,in2]+++audioWorklet :: AudioIO m => String -> [NodeRef] -> SynthDef m NodeRef+audioWorklet workletName inputs = do+  let iChnls = length inputs -- NOTE limiting assumption that each input NodeRef provides only one channel of input+  let oChnls = 1 -- NOTE limiting assumption that each audio worklet provides only one channel of output+  y <- addNodeBuilder (iChnls,oChnls) $ createAudioWorkletNode iChnls oChnls workletName+  zipWithM (\x n -> connect' x 0 y n) inputs [0..]+  return y++createAudioWorkletNode :: AudioIO m => Int -> Int -> String -> m Node+createAudioWorkletNode inChnls outChnls workletName = do+  ctx <- audioContext+  node <- liftIO $ js_createAudioWorkletNode ctx (toJSString workletName) inChnls outChnls+  setNodeField node "isSource" (outChnls > 0)+  setNodeField node "isSink" (inChnls > 0)+  setNodeField node "startable" False++foreign import javascript safe+  "new AudioWorkletNode($1, $2, { numberOfInputs: $3, numberOfOutputs: $4 } )"+  js_createAudioWorkletNode :: AudioContext -> JSVal -> Int -> Int -> IO Node++addWorklets :: AudioContext -> IO ()+addWorklets ac = do+  blob <- js_workletsBlob (toJSString workletsJS)+  url <- js_workletsURL blob+  js_audioWorkletAddModule ac url++foreign import javascript safe+  "new Blob([$1], { type: 'application/javascript' })"+  js_workletsBlob :: JSVal -> IO JSVal++foreign import javascript safe+  "URL.createObjectURL($1)"+  js_workletsURL :: JSVal -> IO JSVal++foreign import javascript safe+  "$1.audioWorklet.addModule($2);"+  js_audioWorkletAddModule :: AudioContext -> JSVal -> IO ()++workletsJS :: String+workletsJS = "\+\ class EqualProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() {\+\    return [];\+\  }\+\  constructor() {\+\    super();\+\  }\+\  process(inputs,outputs,parameters) {\+\    const input1 = inputs[0];\+\    const input2 = inputs[1];\+\    const output = outputs[0];\+\    for(let i = 0; i < input1[0].length; i++) {\+\      if(input1[0][i] == input2[0][i]) output[0][i] = 1; else output[0][i] = 0;\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('equal-processor',EqualProcessor);\+\ \+\ class NotEqualProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() {\+\    return [];\+\  }\+\  constructor() {\+\    super();\+\  }\+\  process(inputs,outputs,parameters) {\+\    const input1 = inputs[0];\+\    const input2 = inputs[1];\+\    const output = outputs[0];\+\    for(let i = 0; i < input1[0].length; i++) {\+\      if(input1[0][i] != input2[0][i]) output[0][i] = 1; else output[0][i] = 0;\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('notEqual-processor',NotEqualProcessor);\+\ \+\ class GreaterThanProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() {\+\    return [];\+\  }\+\  constructor() {\+\    super();\+\  }\+\  process(inputs,outputs,parameters) {\+\    const input1 = inputs[0];\+\    const input2 = inputs[1];\+\    const output = outputs[0];\+\    for(let i = 0; i < input1[0].length; i++) {\+\      if(input1[0][i] > input2[0][i]) output[0][i] = 1; else output[0][i] = 0;\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('greaterThan-processor',GreaterThanProcessor);\+\ \+\ class GreaterThanOrEqualProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() {\+\    return [];\+\  }\+\  constructor() {\+\    super();\+\  }\+\  process(inputs,outputs,parameters) {\+\    const input1 = inputs[0];\+\    const input2 = inputs[1];\+\    const output = outputs[0];\+\    for(let i = 0; i < input1[0].length; i++) {\+\      if(input1[0][i] >= input2[0][i]) output[0][i] = 1; else output[0][i] = 0;\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('greaterThanOrEqual-processor',GreaterThanOrEqualProcessor);\+\ \+\ class LessThanProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() {\+\    return [];\+\  }\+\  constructor() {\+\    super();\+\  }\+\  process(inputs,outputs,parameters) {\+\    const input1 = inputs[0];\+\    const input2 = inputs[1];\+\    const output = outputs[0];\+\    for(let i = 0; i < input1[0].length; i++) {\+\      if(input1[0][i] < input2[0][i]) output[0][i] = 1; else output[0][i] = 0;\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('lessThan-processor',LessThanProcessor);\+\ \+\ class LessThanOrEqualProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() {\+\    return [];\+\  }\+\  constructor() {\+\    super();\+\  }\+\  process(inputs,outputs,parameters) {\+\    const input1 = inputs[0];\+\    const input2 = inputs[1];\+\    const output = outputs[0];\+\    for(let i = 0; i < input1[0].length; i++) {\+\      if(input1[0][i] <= input2[0][i]) output[0][i] = 1; else output[0][i] = 0;\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('lessThanOrEqual-processor',LessThanOrEqualProcessor);\+\ \+\ class MidiCpsProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() { return []; }\+\  constructor() { super(); }\+\  process(inputs,outputs,parameters) {\+\    const input = inputs[0];\+\    const output = outputs[0];\+\    for(let i = 0; i < input[0].length; i++) {\+\      output[0][i] = 440 * (2 ** ((input[0][i]-69)/12));\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('midiCps-processor',MidiCpsProcessor);\+\ \+\ class CpsMidiProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() { return []; }\+\  constructor() { super(); }\+\  process(inputs,outputs,parameters) {\+\    const input = inputs[0];\+\    const output = outputs[0];\+\    for(let i = 0; i < input[0].length; i++) {\+\      output[0][i] = 69 + (12 * (Math.log2(input[0][i]/440)));\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('cpsMidi-processor',CpsMidiProcessor);\+\ \+\ class DbAmpProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() { return []; }\+\  constructor() { super(); }\+\  process(inputs,outputs,parameters) {\+\    const input = inputs[0];\+\    const output = outputs[0];\+\    for(let i = 0; i < input[0].length; i++) {\+\      output[0][i] = 10 ** (input[0][i]/20);\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('dbAmp-processor',DbAmpProcessor);\+\ \+\ class AmpDbProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() { return []; }\+\  constructor() { super(); }\+\  process(inputs,outputs,parameters) {\+\    const input = inputs[0];\+\    const output = outputs[0];\+\    for(let i = 0; i < input[0].length; i++) {\+\      output[0][i] = 20 * Math.log10(input[0][i]);\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('ampDb-processor',AmpDbProcessor);\+\ \+\ class AbsProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() { return []; }\+\  constructor() { super(); }\+\  process(inputs,outputs,parameters) {\+\    const input = inputs[0];\+\    const output = outputs[0];\+\    for(let i = 0; i < input[0].length; i++) {\+\      output[0][i] = Math.abs(input[0][i]);\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('abs-processor',AbsProcessor);\+\ \+\ class SqrtProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() { return []; }\+\  constructor() { super(); }\+\  process(inputs,outputs,parameters) {\+\    const input = inputs[0];\+\    const output = outputs[0];\+\    for(let i = 0; i < input[0].length; i++) {\+\      output[0][i] = Math.sqrt(input[0][i]);\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('sqrt-processor',SqrtProcessor);\+\ \+\ class SafeDivideProcessor extends AudioWorkletProcessor {\+\  static get parameterDescriptors() { return []; }\+\  constructor() { super(); }\+\  process(inputs,outputs,parameters) {\+\    const input1 = inputs[0];\+\    const input2 = inputs[1];\+\    const output = outputs[0];\+\    for(let i = 0; i < input1[0].length; i++) {\+\      if(input2[0][i] == 0) output[0][i] = 0;\+\      else output[0][i] = input1[0][i] / input2[0][i];\+\    }\+\    return true;\+\  }\+\ }\+\ registerProcessor('safeDivide-processor',SafeDivideProcessor);"