Sound.ALSA.PCM.Node.ALSA

Types

data Handle i y

Instances

Storable (Handle i y)

data Stream

Constructors

StreamPlayback

StreamCapture

Instances

Bounded Stream

Enum Stream

Eq Stream

Show Stream

data Mode

Instances

Monoid Mode

modes :: [Mode] -> Mode

nonBlock :: Mode

async :: Mode

data Interleaved

Instances

Access Interleaved

data Noninterleaved

Instances

Access Noninterleaved

type Time = Int

type SampleFreq = Int

type Size = Int

Classes

class Access i

Instances

Access Noninterleaved

Access Interleaved

class (Storable y, C y) => SampleFmt y

Instances

SampleFmt Double

SampleFmt Float

SampleFmt Int8

SampleFmt Int16

SampleFmt Int32

SampleFmt Word8

SampleFmt Word16

SampleFmt Word32

SampleFmt T

SampleFmt a => SampleFmt (T a)

class SampleFmt y => MonoSampleFmt y

Sample types of this class must have exactly one channel, i.e. Frame.numberOfChannels == 1.

Instances

MonoSampleFmt Double

MonoSampleFmt Float

MonoSampleFmt Int8

MonoSampleFmt Int16

MonoSampleFmt Int32

MonoSampleFmt Word8

MonoSampleFmt Word16

MonoSampleFmt Word32

MonoSampleFmt T

Management of streams

open

Arguments

:: (Access i, SampleFmt y)

=> Mode

-> Stream

-> T i y a

-> (a -> T i y b)

-> String

device, e.g "default"

-> IO (b, Handle i y)

close :: Handle i y -> IO ()

prepare :: Handle i y -> IO ()

start :: Handle i y -> IO ()

drop :: Handle i y -> IO ()

drain :: Handle i y -> IO ()

Data transfer

readi :: SampleFmt y => Handle Interleaved y -> Ptr y -> Size -> IO Size

writei :: SampleFmt y => Handle Interleaved y -> Ptr y -> Size -> IO Size

readiRetry :: SampleFmt y => Handle Interleaved y -> Ptr y -> Size -> IO Size

retry on buffer over-run

writeiRetry :: SampleFmt y => Handle Interleaved y -> Ptr y -> Size -> IO Size

retry on buffer under-run

readn :: MonoSampleFmt y => Handle Noninterleaved y -> Ptr (Ptr y) -> Size -> IO Size

The Ptr (Ptr y) argument is actually a pointer to an array of pointers. The array must have the size of number of channels. In Noninterleaved mode you must set the number of channels manually using setChannels or its friends. It is an unchecked error if the number of channels set with setChannels does not match the array size in the readn call.

writen :: MonoSampleFmt y => Handle Noninterleaved y -> Ptr (Ptr y) -> Size -> IO Size

Cf. readn.