| /* |
| * $Id: pablio.c 1151 2006-11-29 02:11:16Z leland_lucius $ |
| * 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; |
| } |