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import Control.Monad (when)
import Data.Default.Class (def)
import qualified SDL
import qualified SDL.Mixer as Mix
import System.Environment (getArgs)
import System.Exit (exitFailure)
main :: IO ()
main = do
-- read arguments
fileName <- do
args <- getArgs
case args of
(arg : _) -> return arg
_ -> do
putStrLn "Usage: cabal run sdl2-mixer-basic <sound filename>"
exitFailure
-- initialize libraries
SDL.initialize [SDL.InitAudio]
Mix.initialize [Mix.InitMP3]
-- open device
Mix.openAudio def 256
-- open file
sound <- Mix.load fileName
-- play file
Mix.play sound
-- wait until finished
whileTrueM $ Mix.playing Mix.AllChannels
-- free resources
Mix.free sound
-- close device
Mix.closeAudio
-- quit
Mix.quit
SDL.quit
whileTrueM :: Monad m => m Bool -> m ()
whileTrueM cond = do
loop <- cond
when loop $ whileTrueM cond
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