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{-# LANGUAGE NondecreasingIndentation #-}
module AlsaSeq (withAlsaInit, parseAlsaEvents, parseAlsaEvents', forwardNoteEvent,
cmdlineAlsaConnect, printChordLn, showChord, pitchList, showPitch,
unPitch, unChannel, MidiHook, MidiPitchSet) where
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.Client.Info as ClientInfo
import qualified Sound.ALSA.Sequencer.Port.Info as PortInfo
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 PortInfoM
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, )
import Text.Printf
import Control.Monad (when, forM_, forM)
import qualified Data.Set as Set
import Data.List (group, sort)
import Haskore.Basic.Pitch
import Foreign.C.Error (Errno(Errno))
import Control.Exception.Base (try)
unPitch = Event.unPitch
unChannel = Event.unChannel
printChordLn set = printWords $ pitchWords set
joinWords [] = ""
joinWords ls = foldr1 (\a b -> a ++ " " ++ b) ls
printWords [] = return () -- print nothing if no words (not an empty line)
printWords ls = putStrLn $ joinWords ls
showChord ls = joinWords $ pitchWords ls
showPitch x =
let (octave, pitch) = Haskore.Basic.Pitch.fromInt $ fromIntegral x
in Haskore.Basic.Pitch.classFormat pitch (show octave)
pitchWords set = map showPitch $ pitchList set
pitchList set = map Event.unPitch $ map (\ (c, n) -> n) $ Set.toList set
pitchLists set = map (\ (c, n) -> (Event.unChannel c, Event.unPitch n)) $ Set.toList set
prettyNote :: Event.Note -> String
prettyNote (Event.Note noteChannel noteNote noteVelocity noteOffVelocity noteDuration) =
let pitch = Event.unPitch noteNote
vlcty = Event.unVelocity noteVelocity
in
printf "%d(%d)" pitch vlcty
showPorts ls = joinWords $ map (show . head) $ group $ sort ls
showAlsaPorts h = do
c <- alsaClients h
putStrLn ""
printf "%15s %s\n" "Ports" "Names"
printf "%15s %s\n" "=====" "====="
forM c (\(name, ports) -> printf "%15s %s\n" (showPorts ports) name)
putStrLn ""
alsaClients h = do
portsNames <- ClientInfo.queryLoop h $ \cinfo -> do
ports <- alsaClientPorts h cinfo
name <- ClientInfo.getName cinfo
return (name, ports)
return portsNames
alsaClientPorts h cinfo = do
client <- ClientInfo.getClient cinfo
ports <- PortInfo.queryLoop h client $ \pinfo -> do
c <- PortInfo.getClient pinfo
let (Client.Cons p) = c in
return p
return ports
withAlsaInit k = do
SndSeq.withDefault SndSeq.Nonblock $ \h -> do
Client.setName (h :: SndSeq.T SndSeq.DuplexMode) "Haskell Beats" -- In imperative language MIDI sequencer, you rock beat. In Haskell language MIDI sequencer, rock beat you!
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
PortInfoM.modify h public $ do
PortInfoM.setTimestamping True
PortInfoM.setTimestampReal True
PortInfoM.setTimestampQueue q
c <- Client.getId h
let publicAddr = Addr.Cons c public
privateAddr = Addr.Cons c private
Queue.control h q Event.QueueStart Nothing
k h public private q publicAddr privateAddr
cmdlineAlsaConnect h public = do
args <- getArgs
case args of
["0"] -> do
return ()
["0", output] -> do
(Connect.createTo h public =<< Addr.parse h output)
return ()
[input] -> do
(Connect.createFrom h public =<< Addr.parse h input)
return ()
[input, output] -> do
(Connect.createFrom h public =<< Addr.parse h input)
(Connect.createTo h public =<< Addr.parse h output)
return ()
_ -> do
showAlsaPorts h
IO.hPutStrLn IO.stderr "need arguments: <input-port> [output-port]"
IO.hPutStrLn IO.stderr " (use port 0 for no input)"
Exit.exitFailure
inputPendingLoop h b = do
mres <- try (Event.inputPending h b >>= return)
case mres of
(Left e) ->
case e of
(AlsaExc.Cons _ _ (Errno 4)) -> inputPendingLoop h b >>= return -- axis: AlsaException.Cons "inputPending" "Interrupted system call" (Errno 4)
(AlsaExc.Cons location _ code) -> do
putStrLn $ "alsa_exception: " ++ AlsaExc.show e -- TODO: log this to a file
AlsaExc.throw location code
(Right result) -> return result
type MidiPitchSet = Set.Set (Event.Channel, Event.Pitch)
parseAlsaEvents :: SndSeq.AllowInput mode =>
SndSeq.T mode -> Set.Set (Event.Channel, Event.Pitch) -> (Event.T -> IO a) -> IO MidiPitchSet
parseAlsaEvents h keysDown immediate = loop keysDown
where
loop keysDown = do
pending <- inputPendingLoop h True
if (pending == 0) then
return keysDown
else do
ev <- Event.input h
immediate ev
case Event.body ev of
Event.NoteEv Event.NoteOn n ->
if (Event.unVelocity (Event.noteVelocity n) == 0) then
loop (Set.delete (Event.noteChannel n, Event.noteNote n) keysDown)
else
loop (Set.insert (Event.noteChannel n, Event.noteNote n) keysDown)
Event.NoteEv Event.NoteOff n ->
loop (Set.delete (Event.noteChannel n, Event.noteNote n) keysDown)
_ -> loop keysDown
parseAlsaEvents' h keysDown immediate = loop [] keysDown
where
loop events keysDown = do
pending <- inputPendingLoop h True
if (pending == 0) then
return (events, keysDown)
else do
ev <- Event.input h
immediate ev
case Event.body ev of
Event.NoteEv Event.NoteOn n ->
if (Event.unVelocity (Event.noteVelocity n) == 0) then
loop (ev:events) (Set.delete (Event.noteChannel n, Event.noteNote n) keysDown)
else
loop (ev:events) (Set.insert (Event.noteChannel n, Event.noteNote n) keysDown)
Event.NoteEv Event.NoteOff n ->
loop (ev:events) (Set.delete (Event.noteChannel n, Event.noteNote n) keysDown)
_ -> loop (ev:events) keysDown
type MidiHook = Event.T -> IO ()
forwardNoteEvent :: SndSeq.AllowOutput mode => SndSeq.T mode -> Queue.T -> Addr.T -> MidiHook
forwardNoteEvent h q publicAddr ev = do
--let immediate = \a b c -> do { Event.output h $ mkEv $ a b c; _ <- Event.drainOutput h; return (); }
-- data T = Cons { highPriority :: !Bool , tag :: !Tag , queue :: !Queue.T , time :: !Time.T , source :: !Addr.T , dest :: !Addr.T , body :: !Data } deriving Show
let (Event.Cons highPriority tag _ time _ _ body) = ev
Event.output h (Event.Cons highPriority tag q time publicAddr Addr.subscribers body)
Event.drainOutput h
return ()
|
