module Sound.ALSA.Sequencer.Marshal.QuerySubscribe where

#include <alsa/asoundlib.h>
import Foreign.C.Types (CInt, )


data Type =
     Read
   | Write
   deriving (Show, Eq, Ord, Enum)

expType :: Type -> CInt
expType t  = case t of
  Read  -> #{const SND_SEQ_QUERY_SUBS_READ}
  Write	-> #{const SND_SEQ_QUERY_SUBS_WRITE}

impType :: CInt -> Type
impType t  = case t of
  #{const SND_SEQ_QUERY_SUBS_READ}  -> Read
  #{const SND_SEQ_QUERY_SUBS_WRITE} -> Write
  _ -> error ("QuerySubscribe.impType: unknown subscription type (" ++ show t ++ ")")