RCMA/Translator/Jack.hs

   1 {-# LANGUAGE Arrows #-}
   2
   3 -- Contains all the information and functions necessary to run a Jack
   4 -- port and exchange information through reactive values and Yampa.
   5 module RCMA.Translator.Jack ( jackSetup
   6                             ) where
   7
   8 import           Control.Applicative                 ((<**>))
   9 import qualified Control.Monad.Exception.Synchronous as Sync
  10 import qualified Control.Monad.Trans.Class           as Trans
  11 import qualified Data.Bifunctor                      as BF
  12 import           Data.CBMVar
  13 import qualified Data.EventList.Absolute.TimeBody    as EventListAbs
  14 import           Data.ReactiveValue
  15 import qualified Foreign.C.Error                     as E
  16 import           Hails.Yampa
  17 import           RCMA.Semantics
  18 import           RCMA.Translator.Filter
  19 import           RCMA.Translator.Message
  20 import           RCMA.Translator.RV
  21 import           RCMA.Translator.Translator
  22 import qualified Sound.JACK                          as Jack
  23 import qualified Sound.JACK.Exception                as JExc
  24 import qualified Sound.JACK.MIDI                     as JMIDI
  25
  26 import           Debug.Trace
  27
  28 rcmaName :: String
  29 rcmaName = "RCMA"
  30
  31 inPortName :: String
  32 inPortName = "input"
  33
  34 outPortName :: String
  35 outPortName = "output"
  36
  37 -- Starts a default client with an input and an output port. Doesn't
  38 -- do anything as such.
  39 jackSetup :: ReactiveFieldRead IO (LTempo, Int, [Note])
  40           -> IO ()
  41 jackSetup boardInRV = Jack.handleExceptions $ do
  42   toProcessRV <- Trans.lift $ toProcess <$> newCBMVar []
  43   Jack.withClientDefault rcmaName $ \client ->
  44     Jack.withPort client outPortName $ \output ->
  45     Jack.withPort client inPortName  $ \input ->
  46     Jack.withProcess client (jackCallBack client input output
  47                               toProcessRV boardInRV) $ do
  48     Trans.lift $ putStrLn $ "Started " ++ rcmaName
  49     Trans.lift $ Jack.waitForBreak
  50
  51 {-
  52 -- Loop that does nothing except setting up a callback function
  53 -- (called when Jack is ready to take new inputs).
  54 jackRun :: (JExc.ThrowsErrno e) =>
  55            Jack.Client
  56         -> (Jack.NFrames -> Sync.ExceptionalT E.Errno IO ())
  57         -> Sync.ExceptionalT e IO ()
  58 jackRun client callback =
  59   Jack.withProcess client callback $ do
  60   Trans.lift $ putStrLn $ "Startedbbb " ++ rcmaName
  61   Trans.lift $ Jack.waitForBreak
  62 -}
  63 defaultTempo :: Tempo
  64 defaultTempo = 96
  65
  66 -- The callback function. It pumps value out of the input port, mix
  67 -- them with value coming from the machine itself and stuff them into
  68 -- the output port. When this function is not running, events are
  69 -- processed.
  70 jackCallBack :: Jack.Client
  71              -> JMIDI.Port Jack.Input
  72              -> JMIDI.Port Jack.Output
  73              -> ReactiveFieldReadWrite IO [(Frames, RawMessage)]
  74              -> ReactiveFieldRead IO (LTempo, Int, [Note])
  75              -> Jack.NFrames
  76              -> Sync.ExceptionalT E.Errno IO ()
  77 jackCallBack client input output toProcessRV boardInRV
  78   nframes@(Jack.NFrames nframesInt') = do
  79   let inMIDIRV = inMIDIEvent input nframes
  80       outMIDIRV = outMIDIEvent output nframes
  81       nframesInt = fromIntegral nframesInt' :: Int
  82   -- This gets the sample rate of the client and the last frame number
  83   -- it processed. We then use it to calculate the current absolute time
  84   sr <- Trans.lift $ Jack.getSampleRate client
  85   (Jack.NFrames lframeInt) <- Trans.lift $ Jack.lastFrameTime client
  86   -- We write the content of the input buffer to the input of a
  87   -- translation signal function.
  88   -- /!\ Should maybe be moved elsewhere
  89   (inRaw, outPure) <- Trans.lift $ yampaReactiveDual [] readMessages
  90   Trans.lift (inMIDIRV =:> inRaw)
  91   (tempo, chan, boardIn') <- Trans.lift $ reactiveValueRead boardInRV
  92   let boardIn = (zip (repeat 0) boardIn',[],[])
  93   outMIDI <- Trans.lift $ reactiveValueRead outPure
  94   -- We translate all signals to be sent into low level signals and
  95   -- write them to the output buffer.
  96   (inPure, outRaw) <- Trans.lift $ yampaReactiveDual
  97                       (defaultTempo, sr, chan, ([],[],[])) gatherMessages
  98   -- This should all go in its own IO action
  99   Trans.lift $ do
 100     reactiveValueWrite inPure (tempo, sr, chan, (boardIn `mappend` outMIDI))
 101     reactiveValueRead outRaw <**>
 102       (mappend <$> reactiveValueRead toProcessRV) >>=
 103       reactiveValueWrite toProcessRV
 104     (go, old') <- schedule nframesInt <$> reactiveValueRead toProcessRV
 105     let old = map (BF.first (+ (- nframesInt))) old'
 106     reactiveValueWrite outMIDIRV go
 107     reactiveValueWrite toProcessRV old
 108   --------------