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pcsx2/3rdparty/portaudio/pablio/pablio.c

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/*
* $Id$
* pablio.c
* Portable Audio Blocking Input/Output utility.
*
* Author: Phil Burk, http://www.softsynth.com
*
* This program uses the PortAudio Portable Audio Library.
* For more information see: http://www.portaudio.com
* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* The text above constitutes the entire PortAudio license; however,
* the PortAudio community also makes the following non-binding requests:
*
* Any person wishing to distribute modifications to the Software is
* requested to send the modifications to the original developer so that
* they can be incorporated into the canonical version. It is also
* requested that these non-binding requests be included along with the
* license above.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "portaudio.h"
#include "pa_ringbuffer.h"
#include "pablio.h"
#include <string.h>
/************************************************************************/
/******** Constants *****************************************************/
/************************************************************************/
#define FRAMES_PER_BUFFER (256)
/************************************************************************/
/******** Prototypes ****************************************************/
/************************************************************************/
static int blockingIOCallback( void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
PaTimestamp outTime, void *userData );
static PaError PABLIO_InitFIFO( RingBuffer *rbuf, long numFrames, long bytesPerFrame );
static PaError PABLIO_TermFIFO( RingBuffer *rbuf );
/************************************************************************/
/******** Functions *****************************************************/
/************************************************************************/
/* Called from PortAudio.
* Read and write data only if there is room in FIFOs.
*/
static int blockingIOCallback( void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
PaTimestamp outTime, void *userData )
{
PABLIO_Stream *data = (PABLIO_Stream*)userData;
long numBytes = data->bytesPerFrame * framesPerBuffer;
(void) outTime;
/* This may get called with NULL inputBuffer during initial setup. */
if( inputBuffer != NULL )
{
PaUtil_WriteRingBuffer( &data->inFIFO, inputBuffer, numBytes );
}
if( outputBuffer != NULL )
{
int i;
int numRead = PaUtil_ReadRingBuffer( &data->outFIFO, outputBuffer, numBytes );
/* Zero out remainder of buffer if we run out of data. */
for( i=numRead; i<numBytes; i++ )
{
((char *)outputBuffer)[i] = 0;
}
}
return 0;
}
/* Allocate buffer. */
static PaError PABLIO_InitFIFO( RingBuffer *rbuf, long numFrames, long bytesPerFrame )
{
long numBytes = numFrames * bytesPerFrame;
char *buffer = (char *) malloc( numBytes );
if( buffer == NULL ) return paInsufficientMemory;
memset( buffer, 0, numBytes );
return (PaError) PaUtil_InitializeRingBuffer( rbuf, numBytes, buffer );
}
/* Free buffer. */
static PaError PABLIO_TermFIFO( RingBuffer *rbuf )
{
if( rbuf->buffer ) free( rbuf->buffer );
rbuf->buffer = NULL;
return paNoError;
}
/************************************************************
* Write data to ring buffer.
* Will not return until all the data has been written.
*/
long WriteAudioStream( PABLIO_Stream *aStream, void *data, long numFrames )
{
long bytesWritten;
char *p = (char *) data;
long numBytes = aStream->bytesPerFrame * numFrames;
while( numBytes > 0)
{
bytesWritten = PaUtil_WriteRingBuffer( &aStream->outFIFO, p, numBytes );
numBytes -= bytesWritten;
p += bytesWritten;
if( numBytes > 0) Pa_Sleep(10);
}
return numFrames;
}
/************************************************************
* Read data from ring buffer.
* Will not return until all the data has been read.
*/
long ReadAudioStream( PABLIO_Stream *aStream, void *data, long numFrames )
{
long bytesRead;
char *p = (char *) data;
long numBytes = aStream->bytesPerFrame * numFrames;
while( numBytes > 0)
{
bytesRead = PaUtil_ReadRingBuffer( &aStream->inFIFO, p, numBytes );
numBytes -= bytesRead;
p += bytesRead;
if( numBytes > 0) Pa_Sleep(10);
}
return numFrames;
}
/************************************************************
* Return the number of frames that could be written to the stream without
* having to wait.
*/
long GetAudioStreamWriteable( PABLIO_Stream *aStream )
{
int bytesEmpty = PaUtil_GetRingBufferWriteAvailable( &aStream->outFIFO );
return bytesEmpty / aStream->bytesPerFrame;
}
/************************************************************
* Return the number of frames that are available to be read from the
* stream without having to wait.
*/
long GetAudioStreamReadable( PABLIO_Stream *aStream )
{
int bytesFull = PaUtil_GetRingBufferReadAvailable( &aStream->inFIFO );
return bytesFull / aStream->bytesPerFrame;
}
/************************************************************/
static unsigned long RoundUpToNextPowerOf2( unsigned long n )
{
long numBits = 0;
if( ((n-1) & n) == 0) return n; /* Already Power of two. */
while( n > 0 )
{
n= n>>1;
numBits++;
}
return (1<<numBits);
}
/************************************************************
* Opens a PortAudio stream with default characteristics.
* Allocates PABLIO_Stream structure.
*
* flags parameter can be an ORed combination of:
* PABLIO_READ, PABLIO_WRITE, or PABLIO_READ_WRITE,
* and either PABLIO_MONO or PABLIO_STEREO
*/
PaError OpenAudioStream( PABLIO_Stream **rwblPtr, double sampleRate,
PaSampleFormat format, long flags )
{
long bytesPerSample;
long doRead = 0;
long doWrite = 0;
PaError err;
PABLIO_Stream *aStream;
long minNumBuffers;
long numFrames;
/* Allocate PABLIO_Stream structure for caller. */
aStream = (PABLIO_Stream *) malloc( sizeof(PABLIO_Stream) );
if( aStream == NULL ) return paInsufficientMemory;
memset( aStream, 0, sizeof(PABLIO_Stream) );
/* Determine size of a sample. */
bytesPerSample = Pa_GetSampleSize( format );
if( bytesPerSample < 0 )
{
err = (PaError) bytesPerSample;
goto error;
}
aStream->samplesPerFrame = ((flags&PABLIO_MONO) != 0) ? 1 : 2;
aStream->bytesPerFrame = bytesPerSample * aStream->samplesPerFrame;
/* Initialize PortAudio */
err = Pa_Initialize();
if( err != paNoError ) goto error;
/* Warning: numFrames must be larger than amount of data processed per interrupt
* inside PA to prevent glitches. Just to be safe, adjust size upwards.
*/
minNumBuffers = 2 * Pa_GetMinNumBuffers( FRAMES_PER_BUFFER, sampleRate );
numFrames = minNumBuffers * FRAMES_PER_BUFFER;
numFrames = RoundUpToNextPowerOf2( numFrames );
/* Initialize Ring Buffers */
doRead = ((flags & PABLIO_READ) != 0);
doWrite = ((flags & PABLIO_WRITE) != 0);
if(doRead)
{
err = PABLIO_InitFIFO( &aStream->inFIFO, numFrames, aStream->bytesPerFrame );
if( err != paNoError ) goto error;
}
if(doWrite)
{
long numBytes;
err = PABLIO_InitFIFO( &aStream->outFIFO, numFrames, aStream->bytesPerFrame );
if( err != paNoError ) goto error;
/* Make Write FIFO appear full initially. */
numBytes = PaUtil_GetRingBufferWriteAvailable( &aStream->outFIFO );
PaUtil_AdvanceRingBufferWriteIndex( &aStream->outFIFO, numBytes );
}
/* Open a PortAudio stream that we will use to communicate with the underlying
* audio drivers. */
err = Pa_OpenStream(
&aStream->stream,
(doRead ? Pa_GetDefaultInputDeviceID() : paNoDevice),
(doRead ? aStream->samplesPerFrame : 0 ),
format,
NULL,
(doWrite ? Pa_GetDefaultOutputDeviceID() : paNoDevice),
(doWrite ? aStream->samplesPerFrame : 0 ),
format,
NULL,
sampleRate,
FRAMES_PER_BUFFER,
minNumBuffers,
paClipOff, /* we won't output out of range samples so don't bother clipping them */
blockingIOCallback,
aStream );
if( err != paNoError ) goto error;
err = Pa_StartStream( aStream->stream );
if( err != paNoError ) goto error;
*rwblPtr = aStream;
return paNoError;
error:
CloseAudioStream( aStream );
*rwblPtr = NULL;
return err;
}
/************************************************************/
PaError CloseAudioStream( PABLIO_Stream *aStream )
{
PaError err;
int bytesEmpty;
int byteSize = aStream->outFIFO.bufferSize;
/* If we are writing data, make sure we play everything written. */
if( byteSize > 0 )
{
bytesEmpty = PaUtil_GetRingBufferWriteAvailable( &aStream->outFIFO );
while( bytesEmpty < byteSize )
{
Pa_Sleep( 10 );
bytesEmpty = PaUtil_GetRingBufferWriteAvailable( &aStream->outFIFO );
}
}
err = Pa_StopStream( aStream->stream );
if( err != paNoError ) goto error;
err = Pa_CloseStream( aStream->stream );
if( err != paNoError ) goto error;
Pa_Terminate();
error:
PABLIO_TermFIFO( &aStream->inFIFO );
PABLIO_TermFIFO( &aStream->outFIFO );
free( aStream );
return err;
}
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