EmptyDataDecls
, FlexibleInstances
, MultiParamTypeClasses
- , TypeFamilies
, UnicodeSyntax
#-}
module Sound.EsounD.Internals
, Channels(..)
, Mono
, Stereo
+ , interleave
+ , deinterleave
- , Mux(..)
-
+ , 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
class Channels ch where
channelFmt ∷ ch → C'esd_format_t
-class (Frame fr, Channels ch) ⇒ Mux (vec ∷ ★ → ★) fr ch where
- type DemuxedVec vec fr ch
- mux ∷ DemuxedVec vec fr ch → vec fr
-
-- Mono
data Mono
instance Channels Mono where
channelFmt _ = c'ESD_MONO
-instance Frame fr ⇒ Mux vec fr Mono where
- type DemuxedVec vec fr Mono = vec fr
- mux = id
-
-- Stereo
data Stereo
instance Channels Stereo where
channelFmt _ = c'ESD_STEREO
-instance Frame fr ⇒ Mux L.Vector fr Stereo where
- type DemuxedVec L.Vector fr Stereo = (L.Vector fr, L.Vector fr)
- mux (left, right) = loop left right
- where
- -- THINKME: consider using storablevector-streamfusion
- loop l r
- = let Just (lFr, l') = L.viewL l
- Just (rFr, r') = L.viewL r
- lr' = loop l' r'
- in
- L.cons lFr (L.cons rFr lr')
+{-# INLINE interleave #-}
+interleave ∷ Storable α ⇒ L.Vector α → L.Vector α → L.Vector α
+interleave l r
+ -- THINKME: consider using storablevector-streamfusion
+ = let Just (lFr, l') = L.viewL l
+ Just (rFr, r') = L.viewL r
+ lr' = interleave l' r'
+ in
+ L.cons lFr (L.cons rFr lr')
+
+{-# INLINE deinterleave #-}
+deinterleave ∷ Storable α ⇒ L.Vector α → (L.Vector α, L.Vector α)
+deinterleave v
+ -- THINKME: consider using storablevector-streamfusion
+ = let (lr, v') = L.splitAt 2 v
+ in
+ if L.null lr then
+ (L.empty, L.empty)
+ else
+ let Just (lFr, r) = L.viewL lr
+ Just (rFr, _) = L.viewL r
+ (l', r') = deinterleave v'
+ in
+ (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 → (CInt → Bool) → CInt → m CInt
+failOnError msg isErr rv
+ | isErr rv = fail msg
+ | otherwise = return rv