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-rw-r--r--portaudio/pablio/pablio.c314
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diff --git a/portaudio/pablio/pablio.c b/portaudio/pablio/pablio.c
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--- a/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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