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import Control.Monad (forever, )
import Control.Monad (mplus, )
import Data.Maybe.HT (toMaybe, )
import qualified Sound.ALSA.Exception as AlsaExc
import qualified Sound.ALSA.Sequencer.Address as Addr
import qualified Sound.ALSA.Sequencer as SndSeq
import qualified Sound.ALSA.Sequencer.Client as Client
import qualified Sound.ALSA.Sequencer.Connect as Connect
import qualified Sound.ALSA.Sequencer.Event as Event
import qualified Sound.ALSA.Sequencer.Event.RemoveMonad as Remove
import qualified Sound.ALSA.Sequencer.Port as Port
import qualified Sound.ALSA.Sequencer.Port.InfoMonad as PortInfo
import qualified Sound.ALSA.Sequencer.Queue as Queue
import qualified Sound.ALSA.Sequencer.RealTime as RealTime
import qualified Sound.ALSA.Sequencer.Time as Time
import qualified System.Exit as Exit
import qualified System.IO as IO
import System.Environment (getArgs, )
main :: IO ()
main = (do
SndSeq.withDefault SndSeq.Block $ \h -> do
Client.setName (h :: SndSeq.T SndSeq.DuplexMode) "Haskell-Beat"
Port.withSimple h "inout"
(Port.caps [Port.capRead, Port.capSubsRead,
Port.capWrite, Port.capSubsWrite])
(Port.types [Port.typeMidiGeneric, Port.typeApplication]) $ \public -> do
Port.withSimple h "private"
(Port.caps [Port.capRead, Port.capWrite])
(Port.types [Port.typeMidiGeneric]) $ \private -> do
Queue.with h $ \q -> do
PortInfo.modify h public $ do
PortInfo.setTimestamping True
PortInfo.setTimestampReal True
PortInfo.setTimestampQueue q
c <- Client.getId h
let publicAddr = Addr.Cons c public
privateAddr = Addr.Cons c private
args <- getArgs
case args of
[input, output] ->
(Connect.createFrom h public =<< Addr.parse h input)
>>
(Connect.createTo h public =<< Addr.parse h output)
>>
return ()
_ ->
IO.hPutStrLn IO.stderr "need arguments: input-client output-client"
>>
Exit.exitFailure
let wait = do
ev <- Event.input h
case Event.body ev of
Event.NoteEv Event.NoteOn n -> return (Event.NoteOn, n)
Event.NoteEv Event.NoteOff n -> return (Event.NoteOff, n)
_ -> wait
Queue.control h q Event.QueueStart Nothing
let mkEv e =
(Event.simple publicAddr e) {
Event.queue = q,
Event.time = Time.consAbs $ Time.Real $ RealTime.fromDouble 0
}
let go = do
(onoff, note) <- wait
print note
Event.output h $ mkEv $ Event.NoteEv onoff note
_ <- Event.drainOutput h
go
go)
`AlsaExc.catch` \e ->
putStrLn $ "alsa_exception: " ++ AlsaExc.show e
|
