src/RMCA/Translator/Jack.hs

   1 {-# LANGUAGE FlexibleContexts #-}
   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 RMCA.Translator.Jack ( jackSetup
   6                             ) where
   7
   8 import qualified Control.Monad.Exception.Synchronous as Sync
   9 import qualified Control.Monad.Trans.Class           as Trans
  10 import qualified Data.Bifunctor                      as BF
  11 import           Data.CBMVar
  12 import           Data.ReactiveValue
  13 import qualified Foreign.C.Error                     as E
  14 import           Hails.Yampa
  15 import           RMCA.Auxiliary.RV
  16 import           RMCA.Semantics
  17 import           RMCA.Translator.Filter
  18 import           RMCA.Translator.Message
  19 import           RMCA.Translator.RV
  20 import           RMCA.Translator.Translator
  21 import qualified Sound.JACK                          as Jack
  22 import qualified Sound.JACK.MIDI                     as JMIDI
  23
  24 rmcaName :: String
  25 rmcaName = "RMCA"
  26
  27 inPortName :: String
  28 inPortName = "input"
  29
  30 outPortName :: String
  31 outPortName = "output"
  32
  33 -- Starts a default client with an input and an output port. Doesn't
  34 -- do anything as such.
  35 jackSetup :: ( ReactiveValueRead tempo LTempo IO
  36              , ReactiveValueRead channel Int IO
  37              , ReactiveValueReadWrite board ([Note],[Message]) IO) =>
  38              tempo
  39           -> channel
  40           -> board
  41           -> IO ()
  42 jackSetup tempoRV chanRV boardInRV = Jack.handleExceptions $ do
  43   toProcessRV <- Trans.lift $ toProcess <$> newCBMVar []
  44   Jack.withClientDefault rmcaName $ \client ->
  45     Jack.withPort client outPortName $ \output ->
  46     Jack.withPort client inPortName  $ \input ->
  47     Jack.withProcess client (jackCallBack client input output
  48                               toProcessRV tempoRV chanRV boardInRV) $
  49     Jack.withActivation client $ Trans.lift $ do
  50     putStrLn $ "Started " ++ rmcaName ++ " JACK client."
  51     Jack.waitForBreak
  52
  53 {-
  54 -- Loop that does nothing except setting up a callback function
  55 -- (called when Jack is ready to take new inputs).
  56 jackRun :: (JExc.ThrowsErrno e) =>
  57            Jack.Client
  58         -> (Jack.NFrames -> Sync.ExceptionalT E.Errno IO ())
  59         -> Sync.ExceptionalT e IO ()
  60 jackRun client callback =
  61   Jack.withProcess client callback $ do
  62   Trans.lift $ putStrLn $ "Startedbbb " ++ rmcaName
  63   Trans.lift $ Jack.waitForBreak
  64 -}
  65 defaultTempo :: Tempo
  66 defaultTempo = 96
  67
  68 -- The callback function. It pumps value out of the input port, mix
  69 -- them with value coming from the machine itself and stuff them into
  70 -- the output port. When this function is not running, events are
  71 -- processed.
  72 jackCallBack :: ( ReactiveValueReadWrite toProcess [(Frames, RawMessage)] IO
  73                 , ReactiveValueRead tempo LTempo IO
  74                 , ReactiveValueRead channel Int IO
  75                 , ReactiveValueReadWrite board ([Note],[Message]) IO) =>
  76                 Jack.Client
  77              -> JMIDI.Port Jack.Input
  78              -> JMIDI.Port Jack.Output
  79              -> toProcess
  80              -> tempo
  81              -> channel
  82              -> board
  83              -> Jack.NFrames
  84              -> Sync.ExceptionalT E.Errno IO ()
  85 jackCallBack client input output toProcessRV tempoRV chanRV outBoard
  86   nframes@(Jack.NFrames nframesInt') = do
  87   let inMIDIRV = inMIDIEvent input nframes
  88       outMIDIRV = outMIDIEvent output nframes
  89       nframesInt = fromIntegral nframesInt' :: Int
  90   -- This gets the sample rate of the client and the last frame number
  91   -- it processed. We then use it to calculate the current absolute time
  92   sr <- Trans.lift $ Jack.getSampleRate client
  93   --(Jack.NFrames lframeInt) <- Trans.lift $ Jack.lastFrameTime client
  94   --Trans.lift (reactiveValueRead inMIDIRV >>= (print . map (fst)))
  95   -- We write the content of the input buffer to the input of a
  96   -- translation signal function.
  97   -- /!\ Should maybe be moved elsewhere
  98   (inRaw, outPure) <- Trans.lift $ yampaReactiveDual [] readMessages
  99   Trans.lift (inMIDIRV =:> inRaw)
 100   tempo <- Trans.lift $ reactiveValueRead tempoRV
 101   chan <- Trans.lift $ reactiveValueRead chanRV
 102   (notes,ctrl) <- Trans.lift $ reactiveValueRead outBoard
 103   Trans.lift $ emptyRW outBoard
 104   let boardIn = (zip (repeat 0) notes, zip (repeat 0) ctrl, [])
 105   outMIDI <- Trans.lift $ reactiveValueRead outPure
 106   -- We translate all signals to be sent into low level signals and
 107   -- write them to the output buffer.
 108   (inPure, outRaw) <- Trans.lift $ yampaReactiveDual
 109                       (defaultTempo, sr, chan, ([],[],[])) gatherMessages
 110   -- This should all go in its own IO action
 111   Trans.lift $ do
 112     reactiveValueWrite inPure (tempo, sr, chan, boardIn `mappend` outMIDI)
 113     reactiveValueRead outRaw >>= reactiveValueAppend toProcessRV
 114     --map fst <$> reactiveValueRead toProcessRV >>= print . ("toProcess " ++) . show
 115     (go, old') <- schedule nframesInt <$> reactiveValueRead toProcessRV
 116     let old = map (BF.first (+ (- nframesInt))) old'
 117     reactiveValueWrite outMIDIRV go
 118     reactiveValueWrite toProcessRV old
 119   --------------