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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE KindSignatures #-}
import AlsaSeq
import Control.Monad.RWS.Strict
import Data.List
import Data.Maybe
import qualified Data.Map.Strict as Map
import qualified Sound.ALSA.Exception as AlsaExc
import qualified Sound.ALSA.Sequencer.Event as Event
import System.Clock
import Control.Applicative
import Database.SQLite.Simple
import Database.SQLite.Simple.FromRow ()
import BasePrelude hiding (loop)
import Control.Concurrent.Chan ()
import Prelude hiding (id, (.))
import qualified Sound.ALSA.Sequencer
import qualified Sound.ALSA.Sequencer.Address
import qualified Sound.ALSA.Sequencer.Port
import qualified Sound.ALSA.Sequencer.Queue
import qualified Sound.ALSA.Sequencer.Time as Time
import qualified Sound.ALSA.Sequencer.RealTime as RealTime
import Midi
import RealTimeQueue as Q hiding (null)
verbose :: Bool
verbose = False
main :: IO ()
main = main' `AlsaExc.catch` handler
where
handler e = when verbose $ putStrLn $ "alsa_exception: " ++ AlsaExc.show e
data Triad = Major Event.Pitch | Minor Event.Pitch deriving (Show, Eq)
data LoopState = LoopState {
_wantExit :: Bool,
_keysDown :: MidiPitchMap,
_triad :: Maybe Triad,
_scheduled :: Q.Queue Event.Data,
_recording :: Recording,
_replay :: Recording,
_lastTick :: TimeSpec
}
initializeState :: TimeSpec -> LoopState
initializeState now = LoopState False Map.empty Nothing createQueue (StartRecording now) (StartRecording now) now
data LoopEnv = LoopEnv {
_saver :: Chan CompleteRecording,
_sqlite :: Connection,
_startTime :: TimeSpec,
_startTimeReal :: TimeSpec,
_h :: Sound.ALSA.Sequencer.T Sound.ALSA.Sequencer.DuplexMode,
_public :: Sound.ALSA.Sequencer.Port.T,
_private :: Sound.ALSA.Sequencer.Port.T,
_q :: Sound.ALSA.Sequencer.Queue.T,
_publicAddr :: Sound.ALSA.Sequencer.Address.T,
_privateAddr :: Sound.ALSA.Sequencer.Address.T,
_doSave :: Bool,
_printChordKeys :: Bool,
_lineReader :: MVar String
}
getAbsTime :: MidiController TimeSpec
getAbsTime = do
startTime <- asks _startTime
startTimeReal <- asks _startTimeReal
now <- liftIO $ getTime Monotonic
return $ now - startTime + startTimeReal
createTable :: Query
createTable = fromString . concat $
[ "CREATE TABLE IF NOT EXISTS axis_input"
, " (id INTEGER PRIMARY KEY,"
, " start_sec INTEGER,"
, " start_nsec INTEGER,"
, " end_sec INTEGER,"
, " end_nsec INTEGER,"
, " first_sec INTEGER,"
, " first_nsec INTEGER,"
, " last_sec INTEGER,"
, " last_nsec INTEGER,"
, " midi BLOB)"
]
sqlInsert :: Query
sqlInsert = fromString . concat $
[ "INSERT INTO axis_input "
, "(start_sec,"
, " start_nsec,"
, " end_sec,"
, " end_nsec,"
, " first_sec,"
, " first_nsec,"
, " last_sec,"
, " last_nsec,"
, " midi)"
, "VALUES (?,?,?,?, ?,?,?,?, ?)"
]
sqlSelectEVERYTHING :: MidiController [CompleteRecording]
sqlSelectEVERYTHING = do
conn <- asks _sqlite
liftIO $ query_ conn $ fromString . concat $
[ "SELECT "
, "start_sec,"
, "start_nsec,"
, "end_sec,"
, "end_nsec,"
, "first_sec,"
, "first_nsec,"
, "last_sec,"
, "last_nsec,"
, "midi"
, " FROM axis_input ORDER BY start_sec, start_nsec;"
]
main' :: IO ()
main' = withAlsaInit $ \h public private q publicAddr privateAddr -> do
cmdlineAlsaConnect h public
startTime <- getTime Monotonic
startTimeReal <- getTime Realtime
sqlite <- open "test.db"
execute_ sqlite createTable
saver <- startSaver sqlite
lineReader <- startLineReader
doSave <- isNothing <$> lookupEnv "NO_SAVE_MIDI"
let env = LoopEnv saver sqlite startTime startTimeReal h public private q publicAddr privateAddr doSave False lineReader
putStrLn "Rock on!"
(_, ()) <- execRWST mainLoop env $ initializeState startTimeReal
return ()
mainLoop :: MidiController ()
mainLoop = do
maybeReadLine >>= maybe processMidi processCommand
wantExit <- gets _wantExit
playScheduled
unless wantExit mainLoop
playScheduled :: MidiController ()
playScheduled = queueAction $ runScheduledIO (TimeSpec 1 0) $ uncurry alsaDelayNoteEv
-- TODO: flush ALSA output here (and remove flush from playNoteEv)
_playNote :: Bool -> Event.Note -> MidiController ()
_playNote noteOn note =
playNoteEv $ Event.NoteEv onoff note
where onoff = if noteOn then Event.NoteOn else Event.NoteOff
delayEvent :: Event.T -> TimeSpec -> Event.T
delayEvent evt ts = evt {Event.time = Time.consRel $ Time.Real (RealTime.fromInteger nanosecs)}
where nanosecs = timeSpecAsNanoSecs ts
playNoteEv :: Event.Data -> MidiController ()
playNoteEv = alsaDelayNoteEv (TimeSpec 0 0)
alsaDelayNoteEv :: TimeSpec -> Event.Data -> MidiController ()
alsaDelayNoteEv delay nevdata = do
ms <- getMidiSender
publicAddr <- asks _publicAddr
liftIO $ ms $ Event.simple publicAddr nevdata `delayEvent` delay'
where delay' = max 0 delay
queueAction :: (Queue Event.Data -> MidiController (Queue Event.Data)) -> MidiController ()
queueAction act = do
q <- gets _scheduled
act q >>= \q' -> modify $ \s -> s { _scheduled = q' }
delayNoteEv :: TimeSpec -> Event.Data -> MidiController ()
delayNoteEv delay nevdata = queueAction $ scheduleEventIO (delay, nevdata)
whenFlag :: MonadReader r m => (r -> Bool) -> m () -> m ()
whenFlag flag f = asks flag >>= flip when f
mkNote :: Word8 -> Event.Note
mkNote pitch = Event.simpleNote (Event.Channel 0) (Event.Pitch pitch) (Event.Velocity 127)
processCommand :: String -> MidiController ()
processCommand "exit" = modify $ \s -> s { _wantExit = True }
-- processCommand "" = return ()
processCommand "" = gets _replay >>= playRecording
processCommand "dump" = sqlSelectEVERYTHING >>= playRecording . mconcat
processCommand "C" = do
let notes = (Event.NoteEv Event.NoteOn . mkNote) <$> [60, 64, 67]
forM_ notes (delayNoteEv (TimeSpec 0 0))
processCommand "C'" = do
let notes = (Event.NoteEv Event.NoteOn . mkNote) <$> [60, 64, 67]
forM_ notes (delayNoteEv (TimeSpec 2 0))
{-
processCommand "C'" = do
-- changing the duration seems to do nothing
let mkNote pitch = Event.simpleNote (Event.Channel 0) (Event.Pitch pitch) (Event.Velocity 127)
setDuration d note = note { Event.noteDuration = Event.Duration d }
let notes = (Event.NoteEv Event.NoteOn . setDuration 4290000000 . mkNote) <$> [60, 64, 67]
forM_ notes (delayNoteEv (TimeSpec 0 0))
-}
processCommand str = liftIO $ putStrLn $ "Unknown command: " ++ str
type MidiControllerT m = RWST LoopEnv () LoopState m
type MidiController = MidiControllerT IO
playRecording :: Playable p => p -> MidiController ()
playRecording = playEvents . playableEvents
-- fixedOutputChannel :: Maybe _
fixedOutputChannel = Just 0
-- setOutputChannel :: Codec.Midi.Message -> Codec.Midi.Message
setOutputChannel = case fixedOutputChannel of Just n -> setChannel n
Nothing -> id
playEvents :: [RecordedEvent] -> RWST LoopEnv () LoopState IO ()
playEvents evts@(_:_) =
mapM_ (uncurry delayNoteEv) (zip (subtract (head delays) <$> delays) events)
where (delays, events) = unzip $ reverse $ unConvertEvents $ (fmap.fmap) setOutputChannel evts -- TODO: do not use fixed channel
playEvents _ = return ()
getMidiSender :: MidiController MidiHook
getMidiSender = do
h <- asks _h
q <- asks _q
publicAddr <- asks _publicAddr
return $ forwardNoteEvent h q publicAddr
processMidi :: MidiController ()
processMidi = do
h <- asks _h
oldKeys <- gets _keysDown
forwardNOW <- getMidiSender
(events, newKeys) <- liftIO $ parseAlsaEvents'' h oldKeys forwardNOW
if oldKeys == newKeys
then liftIO $ threadDelay 15000 -- 15ms. Seems like a lot, but it sounds OK. Cuts CPU down to 2%.
else do
now <- getAbsTime
let newEvents = map ((,) now . Event.body) events
modify $ \s ->
s
{ _keysDown = newKeys
, _recording = recordEvents (_recording s) newEvents
, _lastTick = now
}
whenFlag _printChordKeys $ liftIO $ printChordLn' newKeys
filterTriads newKeys
-- Whenever no keys are pressed, flush any buffered events to the database
when (Map.null newKeys) $ do
doSave <- asks _doSave
when doSave $ gets _recording >>= saveMidi >> return ()
modify $ \s -> s { _recording = StartRecording now }
-- When a key is pressed after 3+ seconds of silence, overwrite the replay buffer with the new keys
when (Map.null oldKeys) $ do
replay <- gets _replay
when (latestEvent replay < (now - TimeSpec 3 0)) $ do
modify $ \s -> s { _replay = StartRecording now }
return ()
modify $ \s -> s { _replay = recordEvents (_replay s) newEvents }
filterTriads :: MidiPitchMap -> MidiController ()
filterTriads newKeys = do
let newTriad = detectTriad newKeys
(Just (vel, _)) = detectTriad' newKeys
-- vel = Event.Velocity 127
oldTriad <- gets _triad
when (newTriad /= oldTriad) $ do
forM_ oldTriad (sendTriadEvents Nothing)
forM_ newTriad (sendTriadEvents $ Just vel)
modify $ \s -> s { _triad = newTriad }
triadBase :: Triad -> Event.Pitch
triadBase (Major n) = n
triadBase (Minor n) = n
-- TODO: set velocity based on average from triad (this requires storing that
-- information, changing the MidiPitchMap type for one more complex than a mere
-- Set)
sendTriadEvents :: Maybe Event.Velocity -> Triad -> MidiController ()
sendTriadEvents vel triad = do
liftIO $ print vel
forM_ notes (delayNoteEv (TimeSpec 0 0))
return ()
where
base = Event.unPitch $ triadBase triad
notes = fromVel vel <$> fill base
fill n = [ x + y | x <- [n, n + 7], y <- [12, -12]]
fromVel (Just v) pitch = Event.NoteEv Event.NoteOn $ Event.simpleNote (Event.Channel 0) (Event.Pitch pitch) v
fromVel Nothing pitch = Event.NoteEv Event.NoteOff $ Event.simpleNote (Event.Channel 0) (Event.Pitch pitch) (Event.Velocity 0)
detectTriad' :: MidiPitchMap -> Maybe (Event.Velocity, Triad)
detectTriad' pitches = listToMaybe $ concatMap f (Map.keys pitches)
where
f pitch = do
let first_ = Map.lookup pitch pitches
major3 = Map.lookup (addPitch 4 pitch) pitches
minor3 = Map.lookup (addPitch 3 pitch) pitches
fifth_ = Map.lookup (addPitch 7 pitch) pitches
let major = foldM (fmap . (+)) (0::Int) $ (fmap . fmap) (fromIntegral . Event.unVelocity) [first_, major3, fifth_]
let minor = foldM (fmap . (+)) (0::Int) $ (fmap . fmap) (fromIntegral . Event.unVelocity) [first_, minor3, fifth_]
case major of
Just n -> [(Event.Velocity $ fromIntegral $ n `div` 3, Major $ snd pitch)]
Nothing ->
case minor of
Just n -> [(Event.Velocity $ fromIntegral $ n `div` 3, Minor $ snd pitch)]
Nothing -> []
addPitch n (c, Event.Pitch p) = (c, Event.Pitch $ p + n)
detectTriad :: MidiPitchMap -> Maybe Triad
detectTriad pitches = listToMaybe $ concatMap f (Map.keys pitches)
where
f pitch
| not $ Map.member (addPitch 7 pitch) pitches = []
| Map.member (addPitch 4 pitch) pitches = [Major $ snd pitch] -- TODO: do not just drop the channel!!
| Map.member (addPitch 3 pitch) pitches = [Minor $ snd pitch]
| otherwise = []
addPitch n (c, Event.Pitch p) = (c, Event.Pitch $ p+n)
latestEvent :: Recording -> TimeSpec
latestEvent (StartRecording x) = x
latestEvent (RecordingInProgress _ x []) = x
latestEvent (RecordingInProgress _ _ ((x,_):_)) = x
maybeReadLine :: MidiController (Maybe String)
maybeReadLine = asks _lineReader >>= liftIO . tryTakeMVar
startLineReader :: IO (MVar String)
startLineReader = do
mv <- liftIO newEmptyMVar
_thread <- liftIO $ forkIO (forever $ tryIOError getLine >>= either (const $ putMVar mv "exit") (putMVar mv))
return mv
saveMidi :: forall (m :: * -> *). (MonadIO m, MonadState LoopState m, MonadReader LoopEnv m) => Recording -> m ()
saveMidi recording = do
saver <- asks _saver
now <- gets _lastTick
mapM_ (liftIO . writeChan saver) $ stopRecording recording now
startSaver :: forall (m :: * -> *). MonadIO m => Connection -> m (Chan CompleteRecording)
startSaver sqlite = do
chan <- liftIO newChan
_thread <- liftIO $ forkIO (saver chan)
return chan
where
saver chan = forever $ do
reco <- readChan chan
liftIO $ execute sqlite sqlInsert reco
return ()
|