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test multi channel in portaudio OS X
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/** @file paex_write_sine.c | |
@ingroup examples_src | |
@brief Play a sine wave for several seconds using the blocking API (Pa_WriteStream()) | |
@author Ross Bencina <rossb@audiomulch.com> | |
@author Phil Burk <philburk@softsynth.com> | |
*/ | |
/* | |
* $Id: paex_write_sine.c 1865 2012-09-01 21:16:25Z philburk $ | |
* | |
* 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 <math.h> | |
#include "portaudio.h" | |
#define NUM_SECONDS (5) | |
#define SAMPLE_RATE (44100) | |
#define FRAMES_PER_BUFFER (1024) | |
#define CHANNELS 15 | |
#ifndef M_PI | |
#define M_PI (3.14159265) | |
#endif | |
#define TABLE_SIZE (200) | |
int main(void); | |
int main(void) | |
{ | |
PaStreamParameters outputParameters; | |
PaStream *stream; | |
PaError err; | |
float buffer[FRAMES_PER_BUFFER][CHANNELS]; /* stereo output buffer */ | |
float sine[TABLE_SIZE]; /* sine wavetable */ | |
int phase = 0; | |
int inc = 1; | |
int i, j, k, l; | |
int bufferCount; | |
printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); | |
/* initialise sinusoidal wavetable */ | |
for( i=0; i<TABLE_SIZE; i++ ) | |
{ | |
sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ); | |
} | |
err = Pa_Initialize(); | |
if( err != paNoError ) goto error; | |
outputParameters.device = 7; //Pa_GetDefaultOutputDevice(); /* default output device */ | |
if (outputParameters.device == paNoDevice) { | |
fprintf(stderr,"Error: No default output device.\n"); | |
goto error; | |
} | |
outputParameters.channelCount = CHANNELS; /* stereo output */ | |
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ | |
outputParameters.suggestedLatency = 0.050; // Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; | |
outputParameters.hostApiSpecificStreamInfo = NULL; | |
err = Pa_OpenStream( | |
&stream, | |
NULL, /* no input */ | |
&outputParameters, | |
SAMPLE_RATE, | |
FRAMES_PER_BUFFER, | |
paClipOff, /* we won't output out of range samples so don't bother clipping them */ | |
NULL, /* no callback, use blocking API */ | |
NULL ); /* no callback, so no callback userData */ | |
if( err != paNoError ) goto error; | |
printf( "Play 3 times, higher each time.\n" ); | |
for( k=0; k < 3; ++k ) | |
{ | |
err = Pa_StartStream( stream ); | |
if( err != paNoError ) goto error; | |
printf("Play for %d seconds.\n", NUM_SECONDS ); | |
bufferCount = ((NUM_SECONDS * SAMPLE_RATE) / FRAMES_PER_BUFFER); | |
for( i=0; i < bufferCount; i++ ) | |
{ | |
for( j=0; j < FRAMES_PER_BUFFER; j++ ) | |
{ | |
for( l=0;l<CHANNELS;l++) | |
buffer[j][l] = sine[phase]; | |
phase += inc; | |
if( phase >= TABLE_SIZE ) phase -= TABLE_SIZE; | |
} | |
err = Pa_WriteStream( stream, buffer, FRAMES_PER_BUFFER ); | |
if( err != paNoError ) goto error; | |
} | |
err = Pa_StopStream( stream ); | |
if( err != paNoError ) goto error; | |
++inc; | |
Pa_Sleep( 1000 ); | |
} | |
err = Pa_CloseStream( stream ); | |
if( err != paNoError ) goto error; | |
Pa_Terminate(); | |
printf("Test finished.\n"); | |
return err; | |
error: | |
fprintf( stderr, "An error occured while using the portaudio stream\n" ); | |
fprintf( stderr, "Error number: %d\n", err ); | |
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); | |
// Print more information about the error. | |
if( err == paUnanticipatedHostError ) | |
{ | |
const PaHostErrorInfo *hostErrorInfo = Pa_GetLastHostErrorInfo(); | |
fprintf( stderr, "Host API error = #%ld, hostApiType = %d\n", hostErrorInfo->errorCode, hostErrorInfo->hostApiType ); | |
fprintf( stderr, "Host API error = %s\n", hostErrorInfo->errorText ); | |
} | |
Pa_Terminate(); | |
return err; | |
} |
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