pa_stream.h File Reference

Stream interfaces, representation structures and helper functions used to interface between pa_front.c host API implementations. More...

#include "portaudio.h"

Go to the source code of this file.

Data Structures
struct	PaUtilStreamInterface
struct	PaUtilStreamRepresentation

Macros
#define	PA_STREAM_MAGIC   (0x18273645)
#define	PA_STREAM_REP(stream)   ((PaUtilStreamRepresentation*) (stream) )
#define	PA_STREAM_INTERFACE(stream)   PA_STREAM_REP( (stream) )->streamInterface

Typedefs
typedef struct PaUtilStreamRepresentation	PaUtilStreamRepresentation

Functions
void	PaUtil_InitializeStreamInterface (PaUtilStreamInterface *streamInterface, PaError(*Close)(PaStream *), PaError(*Start)(PaStream *), PaError(*Stop)(PaStream *), PaError(*Abort)(PaStream *), PaError(*IsStopped)(PaStream *), PaError(*IsActive)(PaStream *), PaTime(*GetTime)(PaStream *), double(*GetCpuLoad)(PaStream *), PaError(*Read)(PaStream *stream, void *buffer, unsigned long frames), PaError(*Write)(PaStream *stream, const void *buffer, unsigned long frames), signed long(*GetReadAvailable)(PaStream *stream), signed long(*GetWriteAvailable)(PaStream *stream))
PaError	PaUtil_DummyRead (PaStream *stream, void *buffer, unsigned long frames)
PaError	PaUtil_DummyWrite (PaStream *stream, const void *buffer, unsigned long frames)
signed long	PaUtil_DummyGetReadAvailable (PaStream *stream)
signed long	PaUtil_DummyGetWriteAvailable (PaStream *stream)
double	PaUtil_DummyGetCpuLoad (PaStream *stream)
void	PaUtil_InitializeStreamRepresentation (PaUtilStreamRepresentation *streamRepresentation, PaUtilStreamInterface *streamInterface, PaStreamCallback *streamCallback, void *userData)
void	PaUtil_TerminateStreamRepresentation (PaUtilStreamRepresentation *streamRepresentation)
PaError	PaUtil_ValidateStreamPointer (PaStream *stream)

Detailed Description

Stream interfaces, representation structures and helper functions used to interface between pa_front.c host API implementations.

Macro Definition Documentation

#define PA_STREAM_INTERFACE

(

stream

)

PA_STREAM_REP( (stream) )->streamInterface

Cast an opaque stream pointer into a pointer to a PaUtilStreamInterface.

See Also

PaUtilStreamRepresentation, PaUtilStreamInterface

Referenced by Pa_AbortStream(), Pa_GetStreamCpuLoad(), Pa_GetStreamReadAvailable(), Pa_GetStreamTime(), Pa_GetStreamWriteAvailable(), Pa_IsStreamActive(), Pa_IsStreamStopped(), Pa_ReadStream(), Pa_SetStreamFinishedCallback(), Pa_StartStream(), Pa_StopStream(), and Pa_WriteStream().

#define PA_STREAM_MAGIC   (0x18273645)

Referenced by PaUtil_InitializeStreamRepresentation(), and PaUtil_ValidateStreamPointer().

#define PA_STREAM_REP

(

stream

)

((PaUtilStreamRepresentation*) (stream) )

Cast an opaque stream pointer into a pointer to a PaUtilStreamRepresentation.

See Also

PaUtilStreamRepresentation

Referenced by Pa_GetStreamInfo(), and Pa_SetStreamFinishedCallback().

Typedef Documentation

typedef struct PaUtilStreamRepresentation PaUtilStreamRepresentation

Non host specific data for a stream. This data is used by pa_front to forward to the appropriate functions in the streamInterface structure.

Function Documentation

double PaUtil_DummyGetCpuLoad

(

PaStream *

stream

)

Dummy GetCpuLoad function for use in an interface to a read/write stream. Pass to the GetCpuLoad parameter of PaUtil_InitializeStreamInterface.

Returns

Returns 0.

Referenced by PaAlsa_Initialize(), PaAsiHpi_Initialize(), PaAsio_Initialize(), PaJack_Initialize(), PaMacCore_Initialize(), PaOSS_Initialize(), PaSkeleton_Initialize(), PaWasapi_Initialize(), PaWinDs_Initialize(), PaWinMme_Initialize(), and PaWinWdm_Initialize().

signed long PaUtil_DummyGetReadAvailable

(

PaStream *

stream

)

Dummy GetReadAvailable function for use in interfaces to callback based streams. Pass to the GetReadAvailable parameter of PaUtil_InitializeStreamInterface.

Returns

An error code indicating that the function has no effect because the stream is a callback stream.

References paCanNotReadFromACallbackStream.

Referenced by PaAlsa_Initialize(), PaAsiHpi_Initialize(), PaAsio_Initialize(), PaJack_Initialize(), PaMacCore_Initialize(), PaOSS_Initialize(), PaSkeleton_Initialize(), PaWasapi_Initialize(), PaWinDs_Initialize(), PaWinMme_Initialize(), and PaWinWdm_Initialize().

signed long PaUtil_DummyGetWriteAvailable

(

PaStream *

stream

)

Dummy GetWriteAvailable function for use in interfaces to callback based streams. Pass to the GetWriteAvailable parameter of PaUtil_InitializeStreamInterface.

Returns

An error code indicating that the function has no effect because the stream is a callback stream.

References paCanNotWriteToACallbackStream.

Referenced by PaAlsa_Initialize(), PaAsiHpi_Initialize(), PaAsio_Initialize(), PaJack_Initialize(), PaMacCore_Initialize(), PaOSS_Initialize(), PaSkeleton_Initialize(), PaWasapi_Initialize(), PaWinDs_Initialize(), PaWinMme_Initialize(), and PaWinWdm_Initialize().

PaError PaUtil_DummyRead	(	PaStream *	stream,
		void *	buffer,
		unsigned long	frames
	)

Dummy Read function for use in interfaces to a callback based streams. Pass to the Read parameter of PaUtil_InitializeStreamInterface.

Returns

An error code indicating that the function has no effect because the stream is a callback stream.

References paCanNotReadFromACallbackStream.

Referenced by PaAlsa_Initialize(), PaAsiHpi_Initialize(), PaAsio_Initialize(), PaJack_Initialize(), PaMacCore_Initialize(), PaOSS_Initialize(), PaSkeleton_Initialize(), PaWasapi_Initialize(), PaWinDs_Initialize(), PaWinMme_Initialize(), and PaWinWdm_Initialize().

PaError PaUtil_DummyWrite	(	PaStream *	stream,
		const void *	buffer,
		unsigned long	frames
	)

Dummy Write function for use in an interfaces to callback based streams. Pass to the Write parameter of PaUtil_InitializeStreamInterface.

Returns

An error code indicating that the function has no effect because the stream is a callback stream.

References paCanNotWriteToACallbackStream.

Referenced by PaAlsa_Initialize(), PaAsiHpi_Initialize(), PaAsio_Initialize(), PaJack_Initialize(), PaMacCore_Initialize(), PaOSS_Initialize(), PaSkeleton_Initialize(), PaWasapi_Initialize(), PaWinDs_Initialize(), PaWinMme_Initialize(), and PaWinWdm_Initialize().

void PaUtil_InitializeStreamInterface	(	PaUtilStreamInterface *	streamInterface,
		PaError(*)(PaStream *)	Close,
		PaError(*)(PaStream *)	Start,
		PaError(*)(PaStream *)	Stop,
		PaError(*)(PaStream *)	Abort,
		PaError(*)(PaStream *)	IsStopped,
		PaError(*)(PaStream *)	IsActive,
		PaTime(*)(PaStream *)	GetTime,
		double(*)(PaStream *)	GetCpuLoad,
		PaError(*)(PaStream *stream, void *buffer, unsigned long frames)	Read,
		PaError(*)(PaStream *stream, const void *buffer, unsigned long frames)	Write,
		signed long(*)(PaStream *stream)	GetReadAvailable,
		signed long(*)(PaStream *stream)	GetWriteAvailable
	)

Initialize the fields of a PaUtilStreamInterface structure.

void PaUtil_InitializeStreamRepresentation	(	PaUtilStreamRepresentation *	streamRepresentation,
		PaUtilStreamInterface *	streamInterface,
		PaStreamCallback *	streamCallback,
		void *	userData
	)

Initialize a PaUtilStreamRepresentation structure.

See Also

PaUtil_InitializeStreamRepresentation

References PaStreamInfo::inputLatency, PaUtilStreamRepresentation::magic, PaUtilStreamRepresentation::nextOpenStream, PaStreamInfo::outputLatency, PA_STREAM_MAGIC, PaStreamInfo::sampleRate, PaUtilStreamRepresentation::streamCallback, PaUtilStreamRepresentation::streamFinishedCallback, PaUtilStreamRepresentation::streamInfo, PaUtilStreamRepresentation::streamInterface, and PaUtilStreamRepresentation::userData.

void PaUtil_TerminateStreamRepresentation

(

PaUtilStreamRepresentation *

streamRepresentation

)

Clean up a PaUtilStreamRepresentation structure previously initialized by a call to PaUtil_InitializeStreamRepresentation.

See Also

PaUtil_InitializeStreamRepresentation

References PaUtilStreamRepresentation::magic.

PaError PaUtil_ValidateStreamPointer

(

PaStream *

stream

)

Check that the stream pointer is valid.

Returns

Returns paNoError if the stream pointer appears to be OK, otherwise returns an error indicating the cause of failure.

References PA_IS_INITIALISED_, PA_STREAM_MAGIC, paBadStreamPtr, paNoError, and paNotInitialized.

Referenced by Pa_AbortStream(), Pa_CloseStream(), Pa_GetStreamCpuLoad(), Pa_GetStreamInfo(), Pa_GetStreamReadAvailable(), Pa_GetStreamTime(), Pa_GetStreamWriteAvailable(), Pa_IsStreamActive(), Pa_IsStreamStopped(), Pa_ReadStream(), Pa_SetStreamFinishedCallback(), Pa_StartStream(), Pa_StopStream(), and Pa_WriteStream().