streamed-0.2: src/Sound/MIDI/ALSA/EventList.hs
module Sound.MIDI.ALSA.EventList where
{-
ToDo:
fix laziness issues in splitting and merging
Maybe this cannot be fixed at all.
In the Causal module this problem is solved.
-}
import Sound.MIDI.ALSA.Common
(Bundle, EventDataBundle, Time, TimeAbs,
Handle, PatternMono, PatternPoly,
sequ, with, incTime,
singletonBundle, checkController, checkChannel,
checkProgram, checkPitch,
SweepState, sweepSpeed, sweepPhase, sweepDepth, sweepCenter,
updateDur, updateChord, )
import qualified Sound.MIDI.ALSA.Common as Common
import qualified Sound.ALSA.Sequencer.Event as Event
import qualified Sound.ALSA.Exception as Exc
import qualified Sound.MIDI.ALSA as MALSA
import qualified Sound.MIDI.Message.Channel as ChannelMsg
import qualified Sound.MIDI.Message.Channel.Voice as VoiceMsg
import Sound.MIDI.Message.Channel (Channel, )
import Sound.MIDI.Message.Channel.Voice (Controller, Program, )
import qualified Data.EventList.Relative.TimeBody as EventList
import qualified Data.EventList.Absolute.TimeBody as EventListAbs
import Data.Accessor.Basic ((^.), )
import qualified Data.List.HT as ListHT
import qualified Data.List.Match as Match
import Data.Tuple.HT (mapFst, mapSnd, mapPair, )
import Data.Ord.HT (limit, )
import qualified Data.List as List
import Data.Maybe (mapMaybe, )
import qualified Data.Map as Map
import qualified Control.Monad.Trans.State as State
import qualified Control.Monad.Trans.Reader as Reader
import Control.Monad.Trans.Reader (ReaderT, )
import Control.Monad.IO.Class (liftIO, )
import qualified Control.Applicative as App
import Control.Monad (liftM2, guard, )
import qualified Data.Foldable as Fold
import qualified Data.Traversable as Trav
import qualified Numeric.NonNegative.Class as NonNeg
import Data.Int (Int32, )
import System.IO.Unsafe (unsafeInterleaveIO, )
import Prelude hiding (init, filter, )
ioToLazyList :: IO a -> IO [a]
ioToLazyList m =
let go = unsafeInterleaveIO $ liftM2 (:) m go
in go
inputEventsCore :: ReaderT Handle IO [Event.T]
inputEventsCore =
Reader.ReaderT $ \h ->
ioToLazyList (Event.input (sequ h))
inputEvents :: ReaderT Handle IO (EventList.T Time Event.Data)
inputEvents =
fmap (EventList.fromAbsoluteEventList .
EventListAbs.fromPairList .
map (\ev -> (Common.timeFromStamp (Event.timestamp ev),
Event.body ev))) $
inputEventsCore
pairListFromRelativeEvents :: EventList.T Time a -> [(TimeAbs,a)]
pairListFromRelativeEvents =
EventListAbs.toPairList .
EventListAbs.mapTime Common.deconsTime .
EventList.toAbsoluteEventList 0
outputEvents :: EventList.T Time Event.Data -> ReaderT Handle IO ()
outputEvents =
mapM_ (uncurry Common.outputEvent) .
pairListFromRelativeEvents
{- |
Sends (drain) each event individually
since the events in the bundle might be created in a lazy manner.
-}
outputEventBundles :: EventList.T Time EventDataBundle -> ReaderT Handle IO ()
outputEventBundles =
mapM_
(\(t,evs) ->
flip mapM_ evs (\(dt,ev) ->
Common.outputEvent (incTime dt t) ev)) .
pairListFromRelativeEvents
outputEventBundled :: EventList.T Time EventDataBundle -> ReaderT Handle IO ()
outputEventBundled =
mapM_
(\(t,evs) -> Reader.ReaderT $ \h ->
flip mapM_ evs (\(dt,ev) ->
Event.output (sequ h) (Common.makeEvent h (incTime dt t) ev)) >>
Event.drainOutput (sequ h) >>
return ()) .
pairListFromRelativeEvents
data Trigger a =
Regular a
| Trigger
instance Functor Trigger where
fmap f (Regular a) = Regular (f a)
fmap _ Trigger = Trigger
instance Fold.Foldable Trigger where
foldMap = Trav.foldMapDefault
instance Trav.Traversable Trigger where
sequenceA (Regular a) = fmap Regular a
sequenceA Trigger = App.pure Trigger
type EventDataTrigger = Bundle (Trigger Event.Data)
makeTriggerEvent :: Handle -> TimeAbs -> Trigger Event.Data -> Event.T
makeTriggerEvent h t x =
case x of
Regular ev -> Common.makeEvent h t ev
Trigger -> Common.makeEcho h t (Event.Custom 0 0 0)
makeTriggerEvents :: Handle -> TimeAbs -> EventDataTrigger -> [Event.T]
makeTriggerEvents h t =
map (\(dt,ev) -> makeTriggerEvent h (incTime dt t) ev)
{- |
This function distinguishes between events from portIn
and events that are generated by us.
Our generated events must also send an echo to the input port
in order to break 'event_input' and thus trigger their delivery.
-}
outputTriggerEvents ::
EventList.T Time EventDataTrigger ->
ReaderT Handle IO ()
outputTriggerEvents =
mapM_
(\(t,ee) -> Reader.ReaderT $ \h ->
mapM_
(\e ->
Event.output (sequ h) e >>
Event.drainOutput (sequ h))
(makeTriggerEvents h t ee)
>> return ()) .
pairListFromRelativeEvents
mergeGenerated ::
EventList.T Time (Bundle a) ->
EventList.T Time (Bundle a) ->
EventList.T Time (Bundle (Trigger a))
mergeGenerated gens ins =
merge
(fmap (\t -> [(t, Trigger)]) $ EventList.fromPairList $
ListHT.mapAdjacent (,) (0 : EventList.getTimes gens))
(fmap (map (mapSnd Regular)) $
merge gens ins)
{- ToDo: move to eventlist package -}
equidistantEvents :: Time -> [a] -> EventList.T Time a
equidistantEvents dur as =
case as of
[] -> EventList.empty
x:xs ->
EventList.cons 0 x $
EventList.fromPairList (map ((,) dur) xs)
whirl :: EventList.T Time EventDataBundle
whirl =
let dur = 0.125
notes =
cycle $ concat $ concatMap (replicate 4) $
[57, 59, 60, 64] :
[57, 59, 60, 65] :
[57, 62, 64, 65] :
[57, 59, 60, 64] :
[]
ctrls =
map (\t -> round (80 + 47 * sin t)) (iterate (0.1+) (0::Double))
events =
zipWith (:)
(map
(\k -> (0, Event.CtrlEv Event.Controller (Event.Ctrl
{Event.ctrlChannel = 0,
Event.ctrlParam = 23,
Event.ctrlValue = k})))
ctrls)
(map
(\k ->
(0, Event.NoteEv Event.NoteOn $ Event.simpleNote 0 k 64) :
(dur, Event.NoteEv Event.NoteOff $ Event.simpleNote 0 k 64) :
[])
notes)
in EventList.cons 0
[(0, Event.CtrlEv Event.PgmChange (Event.Ctrl
{Event.ctrlChannel = 0,
Event.ctrlParam = 0,
Event.ctrlValue = 5}))] $
equidistantEvents dur events
mergeGeneratedAtoms ::
(Time -> a) ->
EventList.T Time a ->
EventList.T Time a ->
EventList.T Time a
mergeGeneratedAtoms trigger gens ins =
Common.mergeStable
(fmap trigger $ EventList.fromPairList $
ListHT.mapAdjacent (,) (0 : EventList.getTimes gens))
(Common.mergeStable gens ins)
patternMono ::
PatternMono i ->
Time ->
EventList.T Time Event.Data ->
EventList.T Time EventDataTrigger
patternMono (Common.PatternMono select ixs) dur ins =
flip State.evalState Map.empty $ Trav.sequenceA $
mergeGeneratedAtoms
(\dt -> return [(dt, Trigger)])
(fmap
(\n -> State.gets (map (mapSnd Regular) . select n dur . Map.toAscList))
(equidistantEvents dur ixs))
(fmap
(\e ->
case e of
Event.NoteEv notePart note -> do
State.modify (updateChord notePart note)
return []
_ -> return $ singletonBundle (Regular e))
ins)
patternMonoTempo ::
PatternMono i ->
((Channel,Controller), (Time,Time,Time)) ->
EventList.T Time Event.Data ->
EventList.T Time EventDataTrigger
patternMonoTempo
(Common.PatternMono select ixs0)
((chan,ctrl), (minDur, defltDur, maxDur)) =
let recourse dur chord ixs =
EventList.switchL EventList.empty $ \(time,me) rest ->
uncurry (EventList.cons time) $
case me of
Nothing ->
case ixs of
[] -> ([], recourse dur chord ixs rest)
i:ir ->
((dur, Trigger) :
map (mapSnd Regular) (select i dur $ Map.toAscList chord),
recourse dur chord ir $
EventList.insertBy (\_ _ -> True) dur Nothing rest)
Just e ->
case e of
Event.NoteEv notePart note ->
([],
recourse dur (updateChord notePart note chord) ixs rest)
Event.CtrlEv Event.Controller param |
Common.controllerMatch chan ctrl param ->
([],
recourse
(updateDur param (minDur,maxDur))
chord ixs rest)
_ -> (singletonBundle (Regular e),
recourse dur chord ixs rest)
in recourse defltDur Map.empty ixs0 .
EventList.insertBy (\_ _ -> True) defltDur Nothing .
fmap Just
{- |
This allows more complex patterns including pauses,
notes of different lengths and simultaneous notes.
-}
patternPolyTempo ::
PatternPoly i ->
((Channel,Controller), (Time,Time,Time)) ->
EventList.T Time Event.Data ->
EventList.T Time EventDataTrigger
patternPolyTempo
(Common.PatternPoly select ixs0)
((chan,ctrl), (minDur, defltDur, maxDur)) =
let recourse dur chord ixs =
EventList.switchL EventList.empty $ \(time,me) rest ->
uncurry (EventList.cons time) $
case me of
Nothing ->
EventList.switchL
([], recourse dur chord ixs rest)
(\(t,is) ir0 ->
let (notes,ir1) =
if t>0
then ([], EventList.cons (t-1) is ir0)
else
(do Common.IndexNote d i <- is
evs <-
select i (fromIntegral d * dur) $
Map.toAscList chord
return (mapSnd Regular evs),
ir0)
in ((dur, Trigger) : notes,
recourse dur chord ir1 $
EventList.insertBy (\_ _ -> True) dur Nothing rest))
ixs
Just e ->
case e of
Event.NoteEv notePart note ->
([],
recourse dur (updateChord notePart note chord) ixs rest)
Event.CtrlEv Event.Controller param |
Common.controllerMatch chan ctrl param ->
([],
recourse
(updateDur param (minDur,maxDur))
chord ixs rest)
_ -> (singletonBundle (Regular e),
recourse dur chord ixs rest)
in recourse defltDur Map.empty ixs0 .
EventList.insertBy (\_ _ -> True) defltDur Nothing .
fmap Just
class Pattern pat where
patternTempo ::
pat ->
((Channel,Controller), (Time,Time,Time)) ->
EventList.T Time Event.Data ->
EventList.T Time EventDataTrigger
instance Pattern (PatternMono i) where
patternTempo = patternMonoTempo
instance Pattern (PatternPoly i) where
patternTempo = patternPolyTempo
{- |
Automatically changes the value of a MIDI controller
every @period@ seconds according to a periodic wave.
The wave function is a mapping
from the phase in @[0,1)@
to a controller value in the range @(-1,1)@.
The generation of the wave is controlled by a speed controller
(@minSpeed@ and @maxSpeed@ are in waves per second),
the modulation depth and the center value.
The center controller is also the one where we emit our wave.
That is, when modulation depth is zero
then this effect is almost the same
as forwarding the controller without modification.
The small difference is, that we emit a controller value at a regular patternMono,
whereas direct control would mean
that only controller value changes are transfered.
> sweep channel
> period (speedCtrl, (minSpeed, maxSpeed)) depthCtrl centerCtrl
> (ctrlRange (-1,1) (sin . (2*pi*)))
We could use the nice Wave abstraction from the synthesizer package,
but that's a heavy dependency because of multi-parameter type classes.
-}
sweep ::
Channel ->
Time ->
(Controller, (Time,Time)) ->
Controller ->
Controller ->
(Double -> Double) ->
EventList.T Time Event.Data ->
EventList.T Time EventDataTrigger
sweep chan dur (speedCtrl, (minSpeed, maxSpeed)) depthCtrl centerCtrl
wave ins =
flip State.evalState
(Common.SweepState {
sweepSpeed =
realToFrac $ Common.deconsTime $
dur*(minSpeed+maxSpeed)/2,
sweepDepth = 64,
sweepCenter = 64,
sweepPhase = 0
}) $
Trav.sequenceA $
mergeGeneratedAtoms
(\dt -> return [(dt, Trigger)])
(fmap
(\() -> do
ev <-
State.gets (\s ->
Event.CtrlEv Event.Controller $
Event.Ctrl {
Event.ctrlChannel = MALSA.fromChannel chan,
Event.ctrlParam = MALSA.fromController centerCtrl,
Event.ctrlValue =
round $ limit (0,127) $
sweepCenter s + sweepDepth s * wave (sweepPhase s)
})
State.modify (\s ->
s{sweepPhase = Common.fraction (sweepPhase s + sweepSpeed s)})
return $ singletonBundle (Regular ev))
(equidistantEvents dur $ repeat ()))
(fmap
(\e ->
maybe (return $ singletonBundle (Regular e))
(\f -> State.modify f >> return []) $ do
Event.CtrlEv Event.Controller param <- Just e
let c = param ^. MALSA.ctrlChannel
ctrl = param ^. MALSA.ctrlController
x :: Num a => a
x = fromIntegral (Event.ctrlValue param)
guard (c==chan)
lookup ctrl $
(speedCtrl,
\s -> s{sweepSpeed =
realToFrac $ Common.deconsTime $ (dur *) $
minSpeed + (maxSpeed-minSpeed) * x/127}) :
(depthCtrl, \s -> s{sweepDepth = x}) :
(centerCtrl, \s -> s{sweepCenter = x}) :
[])
ins)
-- * combinators
{- |
The function maintains empty bundles
in order to maintain laziness breaks.
These breaks are import for later merging of the streams.
-}
filter ::
(a -> Bool) ->
State.State
(EventList.T Time (Bundle a))
(EventList.T Time (Bundle a))
filter p = State.state $
EventList.foldrPair
(\t evs ->
let (evsT,evsF) =
List.partition (p . snd) evs
in mapPair
(EventList.cons t evsT,
EventList.cons t evsF))
(EventList.empty, EventList.empty)
filterSimple ::
(a -> Bool) ->
EventList.T Time (Bundle a) ->
EventList.T Time (Bundle a)
filterSimple p =
EventList.foldrPair
(\t evs ->
EventList.cons t (List.filter (p . snd) evs))
EventList.empty
{-
merge ::
EventList.T Time (Bundle a) ->
EventList.T Time (Bundle a) ->
EventList.T Time (Bundle a)
merge x y =
{-
fmap concat $
EventList.collectCoincident $
-}
Common.mergeStable x y
-}
merge ::
EventList.T Time (Bundle a) ->
EventList.T Time (Bundle a) ->
EventList.T Time (Bundle a)
merge x0 y0 =
flip (EventList.switchL y0) x0 $ \(tx,bx) rx ->
flip (EventList.switchL x0) y0 $ \(ty,by) ry ->
let (tz, ~(bz, rz)) =
mapSnd
(\ ~(b,d) ->
if b
then
mapFst (bx++) $
if d == NonNeg.zero
then (by, merge rx ry)
else ([], merge rx (EventList.cons d by ry))
else
(by, merge (EventList.cons d bx rx) ry)) $
NonNeg.split tx ty
in EventList.cons tz bz rz
-- * run filters
process ::
(EventList.T Time Event.Data ->
EventList.T Time EventDataTrigger) ->
ReaderT Handle IO ()
process f = do
Common.startQueue
outputTriggerEvents . f =<< inputEvents
processSimple ::
(EventList.T Time Event.Data ->
EventList.T Time EventDataBundle) ->
ReaderT Handle IO ()
processSimple f = do
Common.startQueue
outputEventBundles . f =<< inputEvents
runWhirl :: ReaderT Handle IO ()
runWhirl =
process
({-
we must prepend the trigger event,
otherwise 'mergeGenerated' makes us wait for the first user event
-}
EventList.cons 0 [(0,Trigger)] .
mergeGenerated whirl .
fmap singletonBundle)
runDelay :: ReaderT Handle IO ()
runDelay =
processSimple (fmap (Common.delayAdd 50 0.3))
runKeyboardSplit :: ReaderT Handle IO ()
runKeyboardSplit =
processSimple $
uncurry merge .
State.runState (do
low <-
filter (\e ->
(checkChannel (ChannelMsg.toChannel 0 ==) e &&
checkPitch (VoiceMsg.toPitch 60 >) e) ||
checkController (VoiceMsg.toController 91 ==) e ||
checkController (VoiceMsg.toController 93 ==) e)
return $
fmap (mapMaybe (\(t,p) -> fmap ((,) t) $ Common.transpose 12 p) .
map (mapSnd (Common.setChannel (ChannelMsg.toChannel 1)))) low) .
fmap singletonBundle
runKeyboardSplitLow :: ReaderT Handle IO ()
runKeyboardSplitLow =
processSimple $
fmap (mapMaybe (\(t,p) -> fmap ((,) t) $ Common.transpose 12 p) .
map (mapSnd (Common.setChannel (ChannelMsg.toChannel 1)))) .
filterSimple (\e ->
(checkChannel (ChannelMsg.toChannel 0 ==) e &&
checkPitch (VoiceMsg.toPitch 60 >) e) ||
checkController (VoiceMsg.toController 91 ==) e ||
checkController (VoiceMsg.toController 93 ==) e) .
fmap singletonBundle
runKeyboardSplitHigh :: ReaderT Handle IO ()
runKeyboardSplitHigh =
processSimple $
-- fmap (map (mapSnd (setChannel (ChannelMsg.toChannel 0)))) .
filterSimple (\e ->
(checkChannel (ChannelMsg.toChannel 0 ==) e &&
checkPitch (VoiceMsg.toPitch 60 <=) e) ||
checkController (const True) e ||
checkProgram (const True) e) .
fmap singletonBundle
{- this defers events occasionally
EventList.collectCoincident .
fmap ((,) 0)
-}
{- |
> runCyclePrograms (map VoiceMsg.toProgram [8..12])
-}
runCyclePrograms :: [Program] -> ReaderT Handle IO ()
runCyclePrograms pgms =
processSimple
(fmap Common.immediateBundle .
flip State.evalState (cycle pgms) .
Trav.traverse (Common.traverseProgramsSeek (length pgms)))
{- |
> runProgramsAsBanks [8,4,4]
-}
runProgramsAsBanks :: [Int32] -> ReaderT Handle IO ()
runProgramsAsBanks ns =
processSimple
(fmap singletonBundle .
flip State.evalState (Match.replicate ns 0) .
Trav.traverse (Common.programsAsBanks ns))
{- |
> runPattern 0.12 (cycleUp 4)
-}
runPattern ::
Time ->
PatternMono i ->
ReaderT Handle IO ()
runPattern dur pat =
process (patternMono pat dur)
{- |
> runPatternTempo 0.12 (cycleUp 4)
> runPatternTempo 0.2 (PatternMono selectFromOctaveChord (cycle [0,1,2,0,1,2,0,1]))
> runPatternTempo 0.1 (PatternPoly selectFromLimittedChord (let pat = [item 0 1] ./ 1 /. [item 1 1] ./ 2 /. [item 1 1] ./ 1 /. [item 0 1] ./ 2 /. pat in 0 /. pat))
-}
runPatternTempo ::
Pattern pat =>
Time ->
pat ->
ReaderT Handle IO ()
runPatternTempo dur pat =
process
(patternTempo pat
(Common.defaultTempoCtrl, (1.5*dur, dur, 0.5*dur)))
runFilterSweep ::
ReaderT Handle IO ()
runFilterSweep =
process
(sweep (ChannelMsg.toChannel 1)
0.01 (VoiceMsg.toController 72, (0.1, 1))
(VoiceMsg.toController 73) (VoiceMsg.toController 91)
(sin . (2*pi*)))
main :: IO ()
main = (with $ do
liftIO $ putStrLn "Please connect me to a synth"
_ <- liftIO $ getLine
Common.startQueue
liftIO . mapM_ print =<< inputEventsCore
outputEvents =<< inputEvents
outputEventBundles whirl
outputEvents . EventList.mapMaybe (Common.transpose 1) =<< inputEvents)
`Exc.catch` \e ->
putStrLn $ "alsa_exception: " ++ Exc.show e