115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/*
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* $Id: debug_test1.c 178 2002-06-04 23:07:01Z $
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patest1.c
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Ring modulate the audio input with a 441hz sine wave for 20 seconds
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using the Portable Audio api
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Author: Ross Bencina <rossb@audiomulch.com>
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Modifications:
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April 5th, 2001 - PLB - Check for NULL inputBuffer.
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*/
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#include <stdio.h>
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#include <math.h>
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#include "portaudio.h"
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#ifndef M_PI
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#define M_PI (3.14159265)
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#endif
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typedef struct
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{
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float sine[100];
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int phase;
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int sampsToGo;
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}
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patest1data;
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static int patest1Callback( void *inputBuffer, void *outputBuffer,
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unsigned long bufferFrames,
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PaTimestamp outTime, void *userData )
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{
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patest1data *data = (patest1data*)userData;
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float *in = (float*)inputBuffer;
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float *out = (float*)outputBuffer;
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int framesToCalc = bufferFrames;
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unsigned long i;
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int finished = 0;
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if(inputBuffer == NULL) return 0;
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if( data->sampsToGo < bufferFrames )
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{
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finished = 1;
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}
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for( i=0; i<bufferFrames; i++ )
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{
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*out++ = *in++;
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*out++ = *in++;
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if( data->phase >= 100 )
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data->phase = 0;
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}
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data->sampsToGo -= bufferFrames;
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/* zero remainder of final buffer if not already done */
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for( ; i<bufferFrames; i++ )
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{
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*out++ = 0; /* left */
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*out++ = 0; /* right */
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}
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return finished;
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}
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int main(int argc, char* argv[]);
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int main(int argc, char* argv[])
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{
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PaStream *stream;
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PaError err;
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patest1data data;
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int i;
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int inputDevice = Pa_GetDefaultInputDeviceID();
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int outputDevice = Pa_GetDefaultOutputDeviceID();
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/* initialise sinusoidal wavetable */
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for( i=0; i<100; i++ )
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data.sine[i] = sin( ((double)i/100.) * M_PI * 2. );
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data.phase = 0;
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data.sampsToGo = 44100 * 4; // 20 seconds
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/* initialise portaudio subsytem */
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Pa_Initialize();
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err = Pa_OpenStream(
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&stream,
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inputDevice,
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2, /* stereo input */
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paFloat32, /* 32 bit floating point input */
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NULL,
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outputDevice,
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2, /* stereo output */
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paFloat32, /* 32 bit floating point output */
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NULL,
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44100.,
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// 22050, /* half second buffers */
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// 4, /* four buffers */
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512, /* half second buffers */
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0, /* four buffers */
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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patest1Callback,
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&data );
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if( err == paNoError )
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{
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err = Pa_StartStream( stream );
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// printf( "Press any key to end.\n" );
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// getc( stdin ); //wait for input before exiting
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// Pa_AbortStream( stream );
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printf( "Waiting for stream to complete...\n" );
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while( Pa_StreamActive( stream ) )
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Pa_Sleep(1000); /* sleep until playback has finished */
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err = Pa_CloseStream( stream );
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}
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else
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{
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fprintf( stderr, "An error occured while opening the portaudio stream\n" );
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if( err == paHostError )
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fprintf( stderr, "Host error number: %d\n", Pa_GetHostError() );
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else
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fprintf( stderr, "Error number: %d\n", err );
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}
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Pa_Terminate();
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printf( "bye\n" );
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return 0;
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}
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