, interleave
, deinterleave
+ , toLSV
, wrapSocket
, closeSocket
, withCStrOrNull
+ , failOnError
)
where
import Bindings.EsounD
import Data.Int
+import Data.StorableVector as S
import Data.StorableVector.Lazy as L
import Foreign.C.String
import Foreign.C.Types
import System.Posix.Types
class Storable fr ⇒ Frame fr where
- frameFmt ∷ fr → C'esd_format_t
+ frameFmt ∷ fr → C'esd_format_t
+ frameSize ∷ fr → Int
instance Frame Int8 where
- frameFmt _ = c'ESD_BITS8
+ frameFmt _ = c'ESD_BITS8
+ frameSize _ = 1
instance Frame Int16 where
- frameFmt _ = c'ESD_BITS16
+ frameFmt _ = c'ESD_BITS16
+ frameSize _ = 2
class Channels ch where
- channelFmt ∷ ch → C'esd_format_t
+ channelFmt ∷ ch → C'esd_format_t
+ numChannels ∷ ch → Int
-- Mono
data Mono
instance Channels Mono where
- channelFmt _ = c'ESD_MONO
+ channelFmt _ = c'ESD_MONO
+ numChannels _ = 1
-- Stereo
data Stereo
instance Channels Stereo where
- channelFmt _ = c'ESD_STEREO
+ channelFmt _ = c'ESD_STEREO
+ numChannels _ = 2
{-# INLINE interleave #-}
interleave ∷ Storable α ⇒ L.Vector α → L.Vector α → L.Vector α
(L.cons lFr l', L.cons rFr r')
-- Utility functions
+toLSV ∷ Storable α ⇒ S.Vector α → L.Vector α
+toLSV v = L.fromChunks [v]
+
wrapSocket ∷ String → CInt → IO Handle
wrapSocket e (-1) = fail e
wrapSocket _ fd = fdToHandle (Fd fd)
withCStrOrNull ∷ Maybe String → (CString → IO a) → IO a
withCStrOrNull Nothing f = f nullPtr
withCStrOrNull (Just s) f = withCString s f
+
+failOnError ∷ Monad m ⇒ String → (α → Bool) → α → m α
+failOnError msg isErr rv
+ | isErr rv = fail msg
+ | otherwise = return rv