Buffer Processor implementation. More...

#include <assert.h>
#include <string.h>
#include "pa_process.h"
#include "pa_util.h"

Macros
#define	PA_FRAMES_PER_TEMP_BUFFER_WHEN_HOST_BUFFER_SIZE_IS_UNKNOWN_ 1024

#define	PA_MIN_(a, b) ( ((a)<(b)) ? (a) : (b) )

#define	PA_MAX_(a, b) (((a) > (b)) ? (a) : (b))

Functions
PaError	PaUtil_InitializeBufferProcessor (PaUtilBufferProcessor bp, int inputChannelCount, PaSampleFormat userInputSampleFormat, PaSampleFormat hostInputSampleFormat, int outputChannelCount, PaSampleFormat userOutputSampleFormat, PaSampleFormat hostOutputSampleFormat, double sampleRate, PaStreamFlags streamFlags, unsigned long framesPerUserBuffer, unsigned long framesPerHostBuffer, PaUtilHostBufferSizeMode hostBufferSizeMode, PaStreamCallback streamCallback, void *userData)

void	PaUtil_TerminateBufferProcessor (PaUtilBufferProcessor *bp)

void	PaUtil_ResetBufferProcessor (PaUtilBufferProcessor *bp)

unsigned long	PaUtil_GetBufferProcessorInputLatencyFrames (PaUtilBufferProcessor *bp)

unsigned long	PaUtil_GetBufferProcessorOutputLatencyFrames (PaUtilBufferProcessor *bp)

void	PaUtil_SetInputFrameCount (PaUtilBufferProcessor *bp, unsigned long frameCount)

void	PaUtil_SetNoInput (PaUtilBufferProcessor *bp)

void	PaUtil_SetInputChannel (PaUtilBufferProcessor bp, unsigned int channel, void data, unsigned int stride)

void	PaUtil_SetInterleavedInputChannels (PaUtilBufferProcessor bp, unsigned int firstChannel, void data, unsigned int channelCount)

void	PaUtil_SetNonInterleavedInputChannel (PaUtilBufferProcessor bp, unsigned int channel, void data)

void	PaUtil_Set2ndInputFrameCount (PaUtilBufferProcessor *bp, unsigned long frameCount)

void	PaUtil_Set2ndInputChannel (PaUtilBufferProcessor bp, unsigned int channel, void data, unsigned int stride)

void	PaUtil_Set2ndInterleavedInputChannels (PaUtilBufferProcessor bp, unsigned int firstChannel, void data, unsigned int channelCount)

void	PaUtil_Set2ndNonInterleavedInputChannel (PaUtilBufferProcessor bp, unsigned int channel, void data)

void	PaUtil_SetOutputFrameCount (PaUtilBufferProcessor *bp, unsigned long frameCount)

void	PaUtil_SetNoOutput (PaUtilBufferProcessor *bp)

void	PaUtil_SetOutputChannel (PaUtilBufferProcessor bp, unsigned int channel, void data, unsigned int stride)

void	PaUtil_SetInterleavedOutputChannels (PaUtilBufferProcessor bp, unsigned int firstChannel, void data, unsigned int channelCount)

void	PaUtil_SetNonInterleavedOutputChannel (PaUtilBufferProcessor bp, unsigned int channel, void data)

void	PaUtil_Set2ndOutputFrameCount (PaUtilBufferProcessor *bp, unsigned long frameCount)

void	PaUtil_Set2ndOutputChannel (PaUtilBufferProcessor bp, unsigned int channel, void data, unsigned int stride)

void	PaUtil_Set2ndInterleavedOutputChannels (PaUtilBufferProcessor bp, unsigned int firstChannel, void data, unsigned int channelCount)

void	PaUtil_Set2ndNonInterleavedOutputChannel (PaUtilBufferProcessor bp, unsigned int channel, void data)

void	PaUtil_BeginBufferProcessing (PaUtilBufferProcessor bp, PaStreamCallbackTimeInfo timeInfo, PaStreamCallbackFlags callbackStatusFlags)

unsigned long	PaUtil_EndBufferProcessing (PaUtilBufferProcessor bp, int streamCallbackResult)

int	PaUtil_IsBufferProcessorOutputEmpty (PaUtilBufferProcessor *bp)

unsigned long	PaUtil_CopyInput (PaUtilBufferProcessor bp, void *buffer, unsigned long frameCount)

unsigned long	PaUtil_CopyOutput (PaUtilBufferProcessor bp, const void *buffer, unsigned long frameCount)

unsigned long	PaUtil_ZeroOutput (PaUtilBufferProcessor *bp, unsigned long frameCount)

Detailed Description

Buffer Processor implementation.

Macro Definition Documentation

#define PA_FRAMES_PER_TEMP_BUFFER_WHEN_HOST_BUFFER_SIZE_IS_UNKNOWN_ 1024

Referenced by PaUtil_InitializeBufferProcessor().

#define PA_MAX_	(	a,
		b
	)	(((a) > (b)) ? (a) : (b))

#define PA_MIN_	(	a,
		b
	)	( ((a)<(b)) ? (a) : (b) )

Referenced by PaUtil_CopyInput(), PaUtil_CopyOutput(), PaUtil_EndBufferProcessing(), and PaUtil_ZeroOutput().

Function Documentation

void PaUtil_BeginBufferProcessing	(	PaUtilBufferProcessor *	bufferProcessor,
		PaStreamCallbackTimeInfo *	timeInfo,
		PaStreamCallbackFlags	callbackStatusFlags
	)

Commence processing a host buffer (or a pair of host buffers in the full-duplex case) for a callback stream.

Parameters

bufferProcessor	The buffer processor.
timeInfo	Timing information for the first sample of the host buffer(s). This information may be adjusted when buffer adaption is being performed.
callbackStatusFlags	Flags indicating whether underruns and overruns have occurred since the last time the buffer processor was called.

References PaUtilBufferProcessor::callbackStatusFlags, PaUtilBufferProcessor::framesInTempInputBuffer, PaUtilBufferProcessor::framesInTempOutputBuffer, PaUtilBufferProcessor::hostInputFrameCount, PaUtilBufferProcessor::hostOutputFrameCount, PaStreamCallbackTimeInfo::inputBufferAdcTime, PaStreamCallbackTimeInfo::outputBufferDacTime, PaUtilBufferProcessor::samplePeriod, and PaUtilBufferProcessor::timeInfo.

Referenced by ProcessingThreadProc().

unsigned long PaUtil_CopyInput	(	PaUtilBufferProcessor *	bufferProcessor,
		void **	buffer,
		unsigned long	frameCount
	)

Copy samples from host input channels set up by the PaUtil_Set*InputChannels functions to a user supplied buffer. This function is intended for use with blocking read/write streams. Copies the minimum of the number of user frames (specified by the frameCount parameter) and the number of available host frames (specified in a previous call to SetInputFrameCount()).

Parameters

bufferProcessor	The buffer processor.
buffer	A pointer to the user buffer pointer, or a pointer to a pointer to an array of user buffer pointers for a non-interleaved stream. It is important that this parameter points to a copy of the user buffer pointers, not to the actual user buffer pointers, because this function updates the pointers before returning.
frameCount	The number of frames of data in the buffer(s) pointed to by the buffer parameter.

Returns: The number of frames copied. The buffer pointer(s) pointed to by the buffer parameter are advanced to point to the frame(s) following the last one filled.

References PaUtilBufferProcessor::bytesPerHostInputSample, PaUtilBufferProcessor::bytesPerUserInputSample, PaUtilChannelDescriptor::data, PaUtilBufferProcessor::ditherGenerator, PaUtilBufferProcessor::hostInputChannels, PaUtilBufferProcessor::hostInputFrameCount, PaUtilBufferProcessor::inputChannelCount, PaUtilBufferProcessor::inputConverter, PA_MIN_, PaUtilChannelDescriptor::stride, and PaUtilBufferProcessor::userInputIsInterleaved.

unsigned long PaUtil_CopyOutput	(	PaUtilBufferProcessor *	bp,
		const void **	buffer,
		unsigned long	frameCount
	)

References PaUtilBufferProcessor::bytesPerHostOutputSample, PaUtilBufferProcessor::bytesPerUserOutputSample, PaUtilChannelDescriptor::data, PaUtilBufferProcessor::ditherGenerator, PaUtilBufferProcessor::hostOutputChannels, PaUtilBufferProcessor::hostOutputFrameCount, PaUtilBufferProcessor::outputChannelCount, PaUtilBufferProcessor::outputConverter, PA_MIN_, PaUtilChannelDescriptor::stride, and PaUtilBufferProcessor::userOutputIsInterleaved.

unsigned long PaUtil_EndBufferProcessing	(	PaUtilBufferProcessor *	bufferProcessor,
		int *	callbackResult
	)

Finish processing a host buffer (or a pair of host buffers in the full-duplex case) for a callback stream.

Parameters

bufferProcessor The buffer processor.

callbackResult On input, indicates a previous callback result, and on exit, the result of the user stream callback, if it is called. On entry callbackResult should contain one of { paContinue, paComplete, or paAbort}. If paComplete is passed, the stream callback will not be called but any audio that was generated by previous stream callbacks will be copied to the output buffer(s). You can check whether the buffer processor's internal buffer is empty by calling PaUtil_IsBufferProcessorOutputEmpty.

If the stream callback is called its result is stored in *callbackResult. If the stream callback returns paComplete or paAbort, all output buffers will be full of valid data - some of which may be zeros to account for data that wasn't generated by the terminating callback.

Returns: The number of frames processed. This usually corresponds to the number of frames specified by the PaUtil_Set*FrameCount functions, except in the paUtilVariableHostBufferSizePartialUsageAllowed buffer size mode when a smaller value may be returned.

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostBufferSizeMode, PaUtilBufferProcessor::hostInputChannels, PaUtilBufferProcessor::hostInputFrameCount, PaUtilBufferProcessor::hostOutputChannels, PaUtilBufferProcessor::hostOutputFrameCount, PaUtilBufferProcessor::inputChannelCount, PaUtilBufferProcessor::outputChannelCount, PA_MIN_, paAbort, paComplete, paContinue, paUtilVariableHostBufferSizePartialUsageAllowed, and PaUtilBufferProcessor::useNonAdaptingProcess.

Referenced by ProcessingThreadProc().

unsigned long PaUtil_GetBufferProcessorInputLatencyFrames ( PaUtilBufferProcessor * bufferProcessor )

Retrieve the input latency of a buffer processor, in frames.

Parameters

bufferProcessor The buffer processor examine.

Returns: The input latency introduced by the buffer processor, in frames.

See Also: PaUtil_GetBufferProcessorOutputLatencyFrames

References PaUtilBufferProcessor::initialFramesInTempInputBuffer.

Referenced by OpenStream().

unsigned long PaUtil_GetBufferProcessorOutputLatencyFrames ( PaUtilBufferProcessor * bufferProcessor )

Retrieve the output latency of a buffer processor, in frames.

Parameters

bufferProcessor The buffer processor examine.

Returns: The output latency introduced by the buffer processor, in frames.

See Also: PaUtil_GetBufferProcessorInputLatencyFrames

References PaUtilBufferProcessor::initialFramesInTempOutputBuffer.

Referenced by OpenStream().

PaError PaUtil_InitializeBufferProcessor	(	PaUtilBufferProcessor *	bufferProcessor,
		int	inputChannelCount,
		PaSampleFormat	userInputSampleFormat,
		PaSampleFormat	hostInputSampleFormat,
		int	outputChannelCount,
		PaSampleFormat	userOutputSampleFormat,
		PaSampleFormat	hostOutputSampleFormat,
		double	sampleRate,
		PaStreamFlags	streamFlags,
		unsigned long	framesPerUserBuffer,
		unsigned long	framesPerHostBuffer,
		PaUtilHostBufferSizeMode	hostBufferSizeMode,
		PaStreamCallback *	streamCallback,
		void *	userData
	)

Initialize a buffer processor's representation stored in a PaUtilBufferProcessor structure. Be sure to call PaUtil_TerminateBufferProcessor after finishing with a buffer processor.

Parameters

bufferProcessor	The buffer processor structure to initialize.
inputChannelCount	The number of input channels as passed to Pa_OpenStream or 0 for an output-only stream.
userInputSampleFormat	Format of user input samples, as passed to Pa_OpenStream. This parameter is ignored for ouput-only streams.
hostInputSampleFormat	Format of host input samples. This parameter is ignored for output-only streams. See note about host buffer interleave below.
outputChannelCount	The number of output channels as passed to Pa_OpenStream or 0 for an input-only stream.
userOutputSampleFormat	Format of user output samples, as passed to Pa_OpenStream. This parameter is ignored for input-only streams.
hostOutputSampleFormat	Format of host output samples. This parameter is ignored for input-only streams. See note about host buffer interleave below.
sampleRate	Sample rate of the stream. The more accurate this is the better - it is used for updating time stamps when adapting buffers.
streamFlags	Stream flags as passed to Pa_OpenStream, this parameter is used for selecting special sample conversion options such as clipping and dithering.
framesPerUserBuffer	Number of frames per user buffer, as requested by the framesPerBuffer parameter to Pa_OpenStream. This parameter may be zero to indicate that the user will accept any (and varying) buffer sizes.
framesPerHostBuffer	Specifies the number of frames per host buffer for the fixed buffer size mode, and the maximum number of frames per host buffer for the bounded host buffer size mode. It is ignored for the other modes.
hostBufferSizeMode	A mode flag indicating the size variability of host buffers that will be passed to the buffer processor. See PaUtilHostBufferSizeMode for further details.
streamCallback	The user stream callback passed to Pa_OpenStream.
userData	The user data field passed to Pa_OpenStream.

Note: The interleave flag is ignored for host buffer formats. Host interleave is determined by the use of different SetInput and SetOutput functions.

Returns: An error code indicating whether the initialization was successful. If the error code is not PaNoError, the buffer processor was not initialized and should not be used.

See Also: Pa_OpenStream, PaUtilHostBufferSizeMode, PaUtil_TerminateBufferProcessor

Referenced by OpenStream().

int PaUtil_IsBufferProcessorOutputEmpty ( PaUtilBufferProcessor * bufferProcessor )

Determine whether any callback generated output remains in the buffer processor's internal buffers. This method may be used to determine when to continue calling PaUtil_EndBufferProcessing() after the callback has returned a callbackResult of paComplete.

Parameters

bufferProcessor The buffer processor.

Returns: Returns non-zero when callback generated output remains in the internal buffer and zero (0) when there internal buffer contains no callback generated data.

References PaUtilBufferProcessor::framesInTempOutputBuffer.

void PaUtil_ResetBufferProcessor ( PaUtilBufferProcessor * bufferProcessor )

Clear any internally buffered data. If you call PaUtil_InitializeBufferProcessor in your OpenStream routine, make sure you call PaUtil_ResetBufferProcessor in your StartStream call.

Parameters

bufferProcessor The buffer processor to reset.

Referenced by PaPulseAudio_StartStreamCb().

void PaUtil_Set2ndInputChannel	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	channel,
		void *	data,
		unsigned int	stride
	)

Use for the second buffer half when the input buffer is split in two halves.

See Also: PaUtil_SetInputChannel

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostInputChannels, and PaUtilChannelDescriptor::stride.

void PaUtil_Set2ndInputFrameCount	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned long	frameCount
	)

Use for the second buffer half when the input buffer is split in two halves.

See Also: PaUtil_SetInputFrameCount

References PaUtilBufferProcessor::hostInputFrameCount.

void PaUtil_Set2ndInterleavedInputChannels	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	firstChannel,
		void *	data,
		unsigned int	channelCount
	)

Use for the second buffer half when the input buffer is split in two halves.

See Also: PaUtil_SetInterleavedInputChannels

References PaUtilBufferProcessor::bytesPerHostInputSample, PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostInputChannels, PaUtilBufferProcessor::hostInputIsInterleaved, PaUtilBufferProcessor::inputChannelCount, and PaUtilChannelDescriptor::stride.

void PaUtil_Set2ndInterleavedOutputChannels	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	firstChannel,
		void *	data,
		unsigned int	channelCount
	)

Use for the second buffer half when the output buffer is split in two halves.

See Also: PaUtil_SetInterleavedOutputChannels

References PaUtilBufferProcessor::bytesPerHostOutputSample, PaUtilBufferProcessor::hostOutputIsInterleaved, PaUtilBufferProcessor::outputChannelCount, and PaUtil_Set2ndOutputChannel().

void PaUtil_Set2ndNonInterleavedInputChannel	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	channel,
		void *	data
	)

Use for the second buffer half when the input buffer is split in two halves.

See Also: PaUtil_SetNonInterleavedInputChannel

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostInputChannels, PaUtilBufferProcessor::hostInputIsInterleaved, and PaUtilChannelDescriptor::stride.

void PaUtil_Set2ndNonInterleavedOutputChannel	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	channel,
		void *	data
	)

Use for the second buffer half when the output buffer is split in two halves.

See Also: PaUtil_SetNonInterleavedOutputChannel

References PaUtilBufferProcessor::hostOutputIsInterleaved, and PaUtil_Set2ndOutputChannel().

void PaUtil_Set2ndOutputChannel	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	channel,
		void *	data,
		unsigned int	stride
	)

Use for the second buffer half when the output buffer is split in two halves.

See Also: PaUtil_SetOutputChannel

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostOutputChannels, and PaUtilChannelDescriptor::stride.

Referenced by PaUtil_Set2ndInterleavedOutputChannels(), and PaUtil_Set2ndNonInterleavedOutputChannel().

void PaUtil_Set2ndOutputFrameCount	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned long	frameCount
	)

Use for the second buffer half when the output buffer is split in two halves.

See Also: PaUtil_SetOutputFrameCount

References PaUtilBufferProcessor::hostOutputFrameCount.

void PaUtil_SetInputChannel	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	channel,
		void *	data,
		unsigned int	stride
	)

Provide the buffer processor with a pointer to a host input channel.

Parameters

bufferProcessor	The buffer processor.
channel	The channel number.
data	The buffer.
stride	The stride from one sample to the next, in samples. For interleaved host buffers, the stride will usually be the same as the number of channels in the buffer.

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostInputChannels, and PaUtilChannelDescriptor::stride.

void PaUtil_SetInputFrameCount	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned long	frameCount
	)

Set the number of frames in the input host buffer(s) specified by the PaUtil_Set*InputChannel functions.

Parameters

bufferProcessor	The buffer processor.
frameCount	The number of host input frames. A 0 frameCount indicates to use the framesPerHostBuffer value passed to PaUtil_InitializeBufferProcessor.

See Also: PaUtil_SetNoInput, PaUtil_SetInputChannel, PaUtil_SetInterleavedInputChannels, PaUtil_SetNonInterleavedInputChannel

References PaUtilBufferProcessor::framesPerHostBuffer, and PaUtilBufferProcessor::hostInputFrameCount.

Referenced by ProcessingThreadProc().

void PaUtil_SetInterleavedInputChannels	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	firstChannel,
		void *	data,
		unsigned int	channelCount
	)

Provide the buffer processor with a pointer to an number of interleaved host input channels.

Parameters

bufferProcessor	The buffer processor.
firstChannel	The first channel number.
data	The buffer.
channelCount	The number of interleaved channels in the buffer. If channelCount is zero, the number of channels specified to PaUtil_InitializeBufferProcessor will be used.

References PaUtilBufferProcessor::bytesPerHostInputSample, PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostInputChannels, PaUtilBufferProcessor::hostInputIsInterleaved, PaUtilBufferProcessor::inputChannelCount, and PaUtilChannelDescriptor::stride.

Referenced by ProcessingThreadProc().

void PaUtil_SetInterleavedOutputChannels	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	firstChannel,
		void *	data,
		unsigned int	channelCount
	)

Provide the buffer processor with a pointer to a number of interleaved host output channels.

Parameters

bufferProcessor	The buffer processor.
firstChannel	The first channel number.
data	The buffer.
channelCount	The number of interleaved channels in the buffer. If channelCount is zero, the number of channels specified to PaUtil_InitializeBufferProcessor will be used.

References PaUtilBufferProcessor::bytesPerHostOutputSample, PaUtilBufferProcessor::hostOutputIsInterleaved, PaUtilBufferProcessor::outputChannelCount, and PaUtil_SetOutputChannel().

Referenced by ProcessingThreadProc().

void PaUtil_SetNoInput ( PaUtilBufferProcessor * bufferProcessor )

Indicate that no input is available. This function should be used when priming the output of a full-duplex stream opened with the paPrimeOutputBuffersUsingStreamCallback flag. Note that it is not necessary to call this or any other PaUtil_Set*Input* functions for ouput-only streams.

Parameters

bufferProcessor The buffer processor.

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostInputChannels, and PaUtilBufferProcessor::inputChannelCount.

void PaUtil_SetNonInterleavedInputChannel	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	channel,
		void *	data
	)

Provide the buffer processor with a pointer to one non-interleaved host output channel.

Parameters

bufferProcessor	The buffer processor.
channel	The channel number.
data	The buffer.

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostInputChannels, PaUtilBufferProcessor::hostInputIsInterleaved, and PaUtilChannelDescriptor::stride.

void PaUtil_SetNonInterleavedOutputChannel	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	channel,
		void *	data
	)

Provide the buffer processor with a pointer to one non-interleaved host output channel.

Parameters

bufferProcessor	The buffer processor.
channel	The channel number.
data	The buffer.

References PaUtilBufferProcessor::hostOutputIsInterleaved, and PaUtil_SetOutputChannel().

void PaUtil_SetNoOutput ( PaUtilBufferProcessor * bufferProcessor )

Indicate that the output will be discarded. This function should be used when implementing the paNeverDropInput mode for full duplex streams.

Parameters

bufferProcessor The buffer processor.

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostOutputChannels, and PaUtilBufferProcessor::outputChannelCount.

void PaUtil_SetOutputChannel	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned int	channel,
		void *	data,
		unsigned int	stride
	)

Provide the buffer processor with a pointer to a host output channel.

Parameters

bufferProcessor	The buffer processor.
channel	The channel number.
data	The buffer.
stride	The stride from one sample to the next, in samples. For interleaved host buffers, the stride will usually be the same as the number of channels in the buffer.

References PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostOutputChannels, and PaUtilChannelDescriptor::stride.

Referenced by PaUtil_SetInterleavedOutputChannels(), and PaUtil_SetNonInterleavedOutputChannel().

void PaUtil_SetOutputFrameCount	(	PaUtilBufferProcessor *	bufferProcessor,
		unsigned long	frameCount
	)

Set the number of frames in the output host buffer(s) specified by the PaUtil_Set*OutputChannel functions.

Parameters

bufferProcessor	The buffer processor.
frameCount	The number of host output frames. A 0 frameCount indicates to use the framesPerHostBuffer value passed to PaUtil_InitializeBufferProcessor.

See Also: PaUtil_SetOutputChannel, PaUtil_SetInterleavedOutputChannels, PaUtil_SetNonInterleavedOutputChannel

References PaUtilBufferProcessor::framesPerHostBuffer, and PaUtilBufferProcessor::hostOutputFrameCount.

Referenced by ProcessingThreadProc().

void PaUtil_TerminateBufferProcessor ( PaUtilBufferProcessor * bufferProcessor )

Terminate a buffer processor's representation. Deallocates any temporary buffers allocated by PaUtil_InitializeBufferProcessor.

Parameters

bufferProcessor The buffer processor structure to terminate.

See Also: PaUtil_InitializeBufferProcessor.

References PaUtilBufferProcessor::hostInputChannels, PaUtilBufferProcessor::hostOutputChannels, PaUtil_FreeMemory(), PaUtilBufferProcessor::tempInputBuffer, PaUtilBufferProcessor::tempInputBufferPtrs, PaUtilBufferProcessor::tempOutputBuffer, and PaUtilBufferProcessor::tempOutputBufferPtrs.

Referenced by PaPulseAudio_CloseStreamCb().

unsigned long PaUtil_ZeroOutput	(	PaUtilBufferProcessor *	bp,
		unsigned long	frameCount
	)

References PaUtilBufferProcessor::bytesPerHostOutputSample, PaUtilChannelDescriptor::data, PaUtilBufferProcessor::hostOutputChannels, PaUtilBufferProcessor::hostOutputFrameCount, PaUtilBufferProcessor::outputChannelCount, PaUtilBufferProcessor::outputZeroer, PA_MIN_, and PaUtilChannelDescriptor::stride.

Referenced by ProcessingThreadProc().

Macros

Functions

Detailed Description

Macro Definition Documentation

Function Documentation