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/** @file patest1.c
@brief Ring modulate the audio input with a sine wave for 20 seconds.
@author Ross Bencina <rossb@audiomulch.com>
*/
/*
* $Id: patest1.c,v 1.1 2006/06/10 21:30:56 dmazzoni Exp $
*
* 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.
*
* 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 <math.h>
#include "portaudio.h"
#ifndef M_PI
#define M_PI (3.14159265)
#endif
#define SAMPLE_RATE (44100)
typedef struct
{
float sine[100];
int phase;
int sampsToGo;
}
patest1data;
static int patest1Callback( const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
PaStreamCallbackFlags statusFlags,
void *userData )
{
patest1data *data = (patest1data*)userData;
float *in = (float*)inputBuffer;
float *out = (float*)outputBuffer;
int framesToCalc = framesPerBuffer;
unsigned long i = 0;
int finished;
if( data->sampsToGo < framesPerBuffer )
{
framesToCalc = data->sampsToGo;
finished = paComplete;
}
else
{
finished = paContinue;
}
for( ; i<framesToCalc; i++ )
{
*out++ = *in++ * data->sine[data->phase]; /* left */
*out++ = *in++ * data->sine[data->phase++]; /* right */
if( data->phase >= 100 )
data->phase = 0;
}
data->sampsToGo -= framesToCalc;
/* zero remainder of final buffer if not already done */
for( ; i<framesPerBuffer; i++ )
{
*out++ = 0; /* left */
*out++ = 0; /* right */
}
return finished;
}
int main(int argc, char* argv[]);
int main(int argc, char* argv[])
{
PaStream *stream;
PaError err;
patest1data data;
int i;
PaStreamParameters inputParameters, outputParameters;
const PaHostErrorInfo* herr;
printf("patest1.c\n"); fflush(stdout);
printf("Ring modulate input for 20 seconds.\n"); fflush(stdout);
/* initialise sinusoidal wavetable */
for( i=0; i<100; i++ )
data.sine[i] = sin( ((double)i/100.) * M_PI * 2. );
data.phase = 0;
data.sampsToGo = SAMPLE_RATE * 20; /* 20 seconds. */
/* initialise portaudio subsytem */
err = Pa_Initialize();
inputParameters.device = Pa_GetDefaultInputDevice(); /* default input device */
inputParameters.channelCount = 2; /* stereo input */
inputParameters.sampleFormat = paFloat32; /* 32 bit floating point input */
inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency;
inputParameters.hostApiSpecificStreamInfo = NULL;
outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
outputParameters.channelCount = 2; /* stereo output */
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
outputParameters.hostApiSpecificStreamInfo = NULL;
err = Pa_OpenStream(
&stream,
&inputParameters,
&outputParameters,
(double)SAMPLE_RATE, /* Samplerate in Hertz. */
512, /* Small buffers */
paClipOff, /* We won't output out of range samples so don't bother clipping them. */
patest1Callback,
&data );
if( err != paNoError ) goto done;
err = Pa_StartStream( stream );
if( err != paNoError ) goto done;
printf( "Press any key to end.\n" ); fflush(stdout);
getc( stdin ); /* wait for input before exiting */
err = Pa_AbortStream( stream );
if( err != paNoError ) goto done;
printf( "Waiting for stream to complete...\n" );
/* sleep until playback has finished */
while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) Pa_Sleep(1000);
if( err < 0 ) goto done;
err = Pa_CloseStream( stream );
if( err != paNoError ) goto done;
done:
Pa_Terminate();
if( err != paNoError )
{
fprintf( stderr, "An error occurred while using portaudio\n" );
if( err == paUnanticipatedHostError )
{
fprintf( stderr, " unanticipated host error.\n");
herr = Pa_GetLastHostErrorInfo();
if (herr)
{
fprintf( stderr, " Error number: %ld\n", herr->errorCode );
if (herr->errorText)
fprintf( stderr, " Error text: %s\n", herr->errorText );
}
else
fprintf( stderr, " Pa_GetLastHostErrorInfo() failed!\n" );
}
else
{
fprintf( stderr, " Error number: %d\n", err );
fprintf( stderr, " Error text: %s\n", Pa_GetErrorText( err ) );
}
err = 1; /* Always return 0 or 1, but no other return codes. */
}
printf( "bye\n" );
return err;
}
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