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{-
TestMemoryLoader.hs (adapted from test_memoryloader.c in freealut)
Copyright (c) Sven Panne 2005-2009 <sven.panne@aedion.de>
This file is part of the ALUT package & distributed under a BSD-style license
See the file libraries/ALUT/LICENSE
-}
import Control.Exception ( bracket )
import Control.Monad ( when, unless )
import Data.List ( intersperse )
import Foreign.Marshal.Alloc ( allocaBytes )
import Sound.ALUT
import System.Exit ( exitFailure )
import System.IO (
openBinaryFile, IOMode(ReadMode), hClose, hFileSize, hGetBuf, hPutStrLn,
stderr )
-- This program loads and plays a variety of files from memory, basically a
-- modified version of TestFileLoader.hs.
withFileContents :: FilePath -> (MemoryRegion a -> IO b) -> IO b
withFileContents filePath action =
bracket (openBinaryFile filePath ReadMode) hClose $ \handle -> do
numBytes <- fmap fromIntegral (hFileSize handle)
allocaBytes numBytes $ \buf -> do
bytesRead <- hGetBuf handle buf numBytes
when (bytesRead /= numBytes) $
ioError (userError "hGetBuf")
action (MemoryRegion buf (fromIntegral numBytes))
playFile :: FilePath -> IO ()
playFile fileName = do
-- Load the sound file into memory and create an AL buffer from it.
buf <- withFileContents fileName (createBuffer . FileImage)
-- Generate a single source, attach the buffer to it and start playing.
[source] <- genObjectNames 1
buffer source $= Just buf
play [source]
-- Normally nothing should go wrong above, but one never knows...
errs <- get alErrors
unless (null errs) $ do
hPutStrLn stderr (concat (intersperse "," [ d | ALError _ d <- errs ]))
exitFailure
-- Check every 0.1 seconds if the sound is still playing.
let waitWhilePlaying = do
sleep 0.1
state <- get (sourceState source)
when (state == Playing) $
waitWhilePlaying
waitWhilePlaying
main :: IO ()
main =
-- Initialise ALUT and eat any ALUT-specific commandline flags.
withProgNameAndArgs runALUT $ \_progName _args -> do
-- If everything is OK, play the sound files and exit when finished. Note
-- that we can not play raw sound files from memory because the format
-- can't be guessed without a file name.
mapM_ playFile [ "file1.wav", "file2.au" ]
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