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svn path=/trunk/; revision=59

1 files changed, 307 insertions, 0 deletions

diff --git a/pd/portaudio/pablio/pablio.c b/pd/portaudio/pablio/pablio.c
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+++ b/pd/portaudio/pablio/pablio.c
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+/*
+ * $Id: pablio.c,v 1.1.1.1 2002-07-29 17:06:16 ggeiger 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.audiomulch.com/portaudio/
+ * 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.
+ *
+ * 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.
+ *
+ * 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.
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include "portaudio.h"
+#include "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 )
+    {
+        RingBuffer_Write( &data->inFIFO, inputBuffer, numBytes );
+    }
+    if( outputBuffer != NULL )
+    {
+        int i;
+        int numRead = RingBuffer_Read( &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) RingBuffer_Init( 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 = RingBuffer_Write( &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 = RingBuffer_Read( &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 = RingBuffer_GetWriteAvailable( &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 = RingBuffer_GetReadAvailable( &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 = RingBuffer_GetWriteAvailable( &aStream->outFIFO );
+        RingBuffer_AdvanceWriteIndex( &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 = RingBuffer_GetWriteAvailable( &aStream->outFIFO );
+        while( bytesEmpty < byteSize )
+        {
+            Pa_Sleep( 10 );
+            bytesEmpty = RingBuffer_GetWriteAvailable( &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;
+}