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{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE ViewPatterns #-}
{-# LANGUAGE TemplateHaskell, QuasiQuotes #-}
import Foreign.C.Types (CFloat(..))
import qualified Sound.JACK as Jack
import qualified Sound.JACK.Audio as Audio
import Options.Applicative hiding (str)
import Data.Maybe
import System.Directory
import System.FilePath
import System.Posix.Files
import System.Posix.IO
import System.Posix.Types
import System.Environment
import System.Process
import System.Systemd.Daemon (notifyReady, notifyWatchdog)
import Control.Concurrent
import Control.Concurrent.MVar
import Control.Concurrent.Chan
import qualified Control.Monad.Trans.Class as Trans
import qualified Control.Monad.Exception.Synchronous as Sync
import Control.Exception
import System.IO.Error
import System.IO
import System.Exit
import System.FileLock
import System.INotify
import Data.Monoid
import Data.Char
import Data.Function
import Control.Monad
import Text.Heredoc (str)
import Refined (refine)
import Trivmix.Types
data Options = Options
{ input :: String
, output :: String
, client :: String
, initialLevel :: Level
, initialBalance :: Balance
, fps, interval :: Float
, run :: [FilePath]
, balanceFiles :: [FilePath]
, levelFiles :: [FilePath]
}
optionParser :: Parser Options
optionParser = Options
<$> strOption ( long "input"
<> metavar "STRING"
<> value "in"
<> showDefault
<> help "Name of the input port"
)
<*> strOption ( long "output"
<> metavar "STRING"
<> value "out"
<> showDefault
<> help "Name of the output port"
)
<*> strOption ( long "client"
<> metavar "STRING"
<> help "Client name to use in jack (the part before the colon in port names)"
)
<*> option auto ( long "level"
<> metavar "LEVEL"
<> help "Initial value for level"
<> value def
<> showDefault
)
<*> option auto ( long "initial-balance"
<> metavar "BALANCE"
<> help "Initial value for balance"
<> value def
<> showDefault
)
<*> option auto ( long "fps"
<> metavar "NUMBER"
<> help "Update level ‘NUMBER’ times per second"
<> value 200
<> showDefault
)
<*> option auto ( long "interval"
<> metavar "NUMBER"
<> help "Smooth level transitions over ‘NUMBER’ seconds"
<> value 0.2
<> showDefault
)
<*> many ( strOption ( long "run"
<> metavar "FILE"
<> help [str|Execute a file once setup of jacks is done (use this to autoconnect)
|The executable gets passed the input port (including client name) as its first argument and the output as its second.
|]
)
)
<*> many ( strOption ( long "balance"
<> metavar "FILE"
<> help [str|Files that contain factors in the interval [0,1] to multiply with each other and the current level.
|For deterministic behaviour use flock(2).
|The format used in these files is a float using ‘.’ as a decimal point.
|]
)
)
<*> many (strArgument ( metavar "FILE..."
<> help [str|Files that contain levels to assume and synchronize
|For deterministic behaviour use flock(2).
|The format used in these files is either a signed float, using ‘.’ as a decimal point or a signed float postfixed with ‘dB’.
|Caveat: ‘-InfinitydB’ exists and works as expected (i.e.: it is equal to ‘0.0’)
|]
)
)
watchedAttrs :: [EventVariety]
watchedAttrs = [ Modify
, Move
, MoveIn
, MoveOut
, MoveSelf
, Create
, Delete
, DeleteSelf
]
defFileMode :: FileMode
defFileMode = foldl unionFileModes nullFileMode [ ownerReadMode
, ownerWriteMode
, groupReadMode
, groupWriteMode
, otherReadMode
]
defDirectoryMode :: FileMode
defDirectoryMode = foldl unionFileModes nullFileMode [ ownerModes
, groupReadMode
, groupExecuteMode
, otherReadMode
, otherExecuteMode
]
main :: IO ()
main = execParser opts >>= trivmix
where
opts = info (helper <*> optionParser)
( fullDesc
<> progDesc "Setup a JACK mixing input/output pair controlled by files"
<> header "Trivmix - A trivial mixer"
)
trivmix :: Options -> IO ()
trivmix Options{..} = do
level <- newMVar initialLevel
balance <- newMVar initialBalance
level' <- newMVar 0
let withFiles = foldl (.) id $ map (\f -> onStateFile f (show initialLevel ++ "\n")) levelFiles
++ map (\f -> onStateFile f (show initialBalance ++ "\n")) balanceFiles
withFiles $ withINotify $ \inotify -> do
handleFiles inotify level levelFiles
handleFiles inotify balance levelFiles
Jack.handleExceptions $
Jack.withClientDefault client $ \client' ->
Jack.withPort client' input $ \input' ->
Jack.withPort client' output $ \output' ->
Audio.withProcessMono client' input' (mix level') output' $
Jack.withActivation client' . Trans.lift $ do
forM_ run $ \script ->
(callProcess script [client ++ ":" ++ input, client ++ ":" ++ output]) `catch` (\code -> hPutStrLn stderr $ script ++ " failed: " ++ show (code :: ExitCode))
forkIO . forever $ do -- Smooth out discontinuity
let
frames = interval * fps
delay = round $ recip fps * 1e6
linInt x a b = a * (1 - x) + b * x
linInt' x a b = either error id $ asFloat (linInt x) a b
mulBalance (bToFloat -> b) x = either error id $ asFloat (*) (Lin . either error id $ refine b) x
newLevel <- mulBalance <$> readMVar balance <*> readMVar level
currentLevel <- readMVar level'
mapM_ (\x -> swapMVar level' (linInt' x currentLevel newLevel) >> threadDelay delay) [0,recip frames..1]
notifyReady
forever $ threadDelay 1000000 >> notifyWatchdog
mix :: MVar Level -> CFloat -> IO CFloat
mix level input = do
level' <- readMVar level
return $ (CFloat $ toFloat level') * input
handleFiles :: (Read l, Show l, Eq l) => INotify -> MVar l -> [FilePath] -> IO ()
handleFiles inotify level files = do
initLevel <- readMVar level
levelChanges <- newChan
stderrLock <- newEmptyMVar
let
handleFile file = addWatch inotify watchedAttrs file (const $ readLevel levelChanges level file stderrLock)
mapM_ handleFile files
forkIO $ forever $ do -- Broadcast level changes and update all files
levelState <- readChan levelChanges
swapMVar level levelState
mapM_ (\f -> writeLevel f stderrLock levelState) files
return ()
return ()
onStateFile :: FilePath -> String -> IO a -> IO a
onStateFile file initial action = do
let directory = takeDirectory file
directories = iterate takeDirectory directory
createDirs <- takeWhileM (\d -> not <$> doesDirectoryExist d) directories
exists <- doesFileExist file
setFileCreationMask nullFileMode
let acquireFile = case exists of
True -> return ()
False -> do
hPutStrLn stderr $ "Creating ‘" ++ file ++ "’ (file)"
createFile file defFileMode >>= closeFd >> writeFile file initial
releaseFile = case exists of
True -> return ()
False -> do
hPutStrLn stderr $ "Removing ‘" ++ file ++ "’ (file)"
removeFile file
acquireDir = (flip mapM) (reverse createDirs) $ \directory -> do
hPutStrLn stderr $ "Creating ‘" ++ directory ++ "’ (dir)"
createDirectory directory
setFileMode directory defDirectoryMode
releaseDir = (flip mapM) createDirs $ \directory -> do
hPutStrLn stderr $ "Removing ‘" ++ directory ++ "’ (dir)"
removeDirectory directory
acquire = acquireDir >> acquireFile
release = releaseFile >> releaseDir
bracket_ acquire release action
takeWhileM :: Monad m => (a -> m Bool) -> [a] -> m [a]
takeWhileM _ [] = return []
takeWhileM pred (x:xs) = do
take <- pred x
case take of
True -> do
rest <- takeWhileM pred xs
return $ x:rest
False -> do
return []
readLevel :: (Read l, Show l, Eq l) => Chan l -> MVar l -> FilePath -> MVar () -> IO ()
readLevel levelChan current file stderrLock = catch action handler
where
action = do
level <- withFileLock file Shared $ const $ readFile file >>= readIO . stripSpace
oldLevel <- readMVar current
when (oldLevel /= level) $ do
writeChan levelChan level
withMVarLock stderrLock $
hPutStrLn stderr $ "Detected new level: " ++ (show level)
handler e = if isUserError e
then do
withMVarLock stderrLock $
hPutStrLn stderr $ "Could not parse new level from ‘" ++ file ++ "’ - overwriting."
readMVar current >>= writeLevel file stderrLock
else throw e
stripSpace = reverse . stripSpace' . reverse . stripSpace'
stripSpace' [] = []
stripSpace' l@(x:xs) = if isSpace x
then stripSpace' xs
else l
writeLevel :: Show l => FilePath -> MVar () -> l -> IO ()
writeLevel file stderrLock level = withFileLock file Exclusive $ const $ do
withMVarLock stderrLock $
hPutStrLn stderr $ "Writing out level ‘" ++ (show level) ++ "’ to ‘" ++ file ++ "’"
writeFile file (show level ++ "\n")
withMVarLock :: MVar () -> IO a -> IO a
withMVarLock lock = bracket_ (putMVar lock ()) (takeMVar lock)
|