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Diffstat (limited to 'portaudio/pablio/pablio.c')
| -rw-r--r-- | portaudio/pablio/pablio.c | 314 |
1 files changed, 314 insertions, 0 deletions
diff --git a/portaudio/pablio/pablio.c b/portaudio/pablio/pablio.c new file mode 100644 index 0000000..0b54773 --- /dev/null +++ b/portaudio/pablio/pablio.c @@ -0,0 +1,314 @@ +/* + * $Id: pablio.c,v 1.3 2010/11/02 18:52:45 rbd Exp $ + * 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; +} |