Chris@39: /** @file patest1.c
Chris@39: 	@ingroup test_src
Chris@39: 	@brief Ring modulate the audio input with a sine wave for 20 seconds.
Chris@39: 	@author Ross Bencina <rossb@audiomulch.com>
Chris@39: */
Chris@39: /*
Chris@39:  * $Id: patest1.c 1368 2008-03-01 00:38:27Z rossb $
Chris@39:  *
Chris@39:  * This program uses the PortAudio Portable Audio Library.
Chris@39:  * For more information see: http://www.portaudio.com
Chris@39:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
Chris@39:  *
Chris@39:  * Permission is hereby granted, free of charge, to any person obtaining
Chris@39:  * a copy of this software and associated documentation files
Chris@39:  * (the "Software"), to deal in the Software without restriction,
Chris@39:  * including without limitation the rights to use, copy, modify, merge,
Chris@39:  * publish, distribute, sublicense, and/or sell copies of the Software,
Chris@39:  * and to permit persons to whom the Software is furnished to do so,
Chris@39:  * subject to the following conditions:
Chris@39:  *
Chris@39:  * The above copyright notice and this permission notice shall be
Chris@39:  * included in all copies or substantial portions of the Software.
Chris@39:  *
Chris@39:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
Chris@39:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
Chris@39:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
Chris@39:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
Chris@39:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
Chris@39:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
Chris@39:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Chris@39:  */
Chris@39: 
Chris@39: /*
Chris@39:  * The text above constitutes the entire PortAudio license; however, 
Chris@39:  * the PortAudio community also makes the following non-binding requests:
Chris@39:  *
Chris@39:  * Any person wishing to distribute modifications to the Software is
Chris@39:  * requested to send the modifications to the original developer so that
Chris@39:  * they can be incorporated into the canonical version. It is also 
Chris@39:  * requested that these non-binding requests be included along with the 
Chris@39:  * license above.
Chris@39:  */
Chris@39: 
Chris@39: #include <stdio.h>
Chris@39: #include <math.h>
Chris@39: #include "portaudio.h"
Chris@39: 
Chris@39: #ifndef M_PI
Chris@39: #define M_PI (3.14159265)
Chris@39: #endif
Chris@39: 
Chris@39: #define SAMPLE_RATE (44100)
Chris@39: 
Chris@39: typedef struct
Chris@39: {
Chris@39:     float sine[100];
Chris@39:     int phase;
Chris@39:     int sampsToGo;
Chris@39: }
Chris@39: patest1data;
Chris@39: 
Chris@39: static int patest1Callback( const void *inputBuffer, void *outputBuffer,
Chris@39:                             unsigned long framesPerBuffer,
Chris@39:                             const PaStreamCallbackTimeInfo* timeInfo,
Chris@39:                             PaStreamCallbackFlags statusFlags,
Chris@39:                             void *userData )
Chris@39: {
Chris@39:     patest1data *data = (patest1data*)userData;
Chris@39:     float *in = (float*)inputBuffer;
Chris@39:     float *out = (float*)outputBuffer;
Chris@39:     int framesToCalc = framesPerBuffer;
Chris@39:     unsigned long i = 0;
Chris@39:     int finished;
Chris@39: 
Chris@39:     if( data->sampsToGo < framesPerBuffer )
Chris@39:     {
Chris@39:         framesToCalc = data->sampsToGo;
Chris@39:         finished = paComplete;
Chris@39:     }
Chris@39:     else
Chris@39:     {
Chris@39:         finished = paContinue;
Chris@39:     }
Chris@39: 
Chris@39:     for( ; i<framesToCalc; i++ )
Chris@39:     {
Chris@39:         *out++ = *in++ * data->sine[data->phase];  /* left */
Chris@39:         *out++ = *in++ * data->sine[data->phase++];  /* right */
Chris@39:         if( data->phase >= 100 )
Chris@39:             data->phase = 0;
Chris@39:     }
Chris@39: 
Chris@39:     data->sampsToGo -= framesToCalc;
Chris@39: 
Chris@39:     /* zero remainder of final buffer if not already done */
Chris@39:     for( ; i<framesPerBuffer; i++ )
Chris@39:     {
Chris@39:         *out++ = 0; /* left */
Chris@39:         *out++ = 0; /* right */
Chris@39:     }
Chris@39:     
Chris@39:     return finished;
Chris@39: }
Chris@39: 
Chris@39: int main(int argc, char* argv[]);
Chris@39: int main(int argc, char* argv[])
Chris@39: {
Chris@39:     PaStream                *stream;
Chris@39:     PaError                 err;
Chris@39:     patest1data             data;
Chris@39:     int                     i;
Chris@39:     PaStreamParameters      inputParameters, outputParameters;
Chris@39:     const PaHostErrorInfo*  herr;
Chris@39: 
Chris@39:     printf("patest1.c\n"); fflush(stdout);
Chris@39:     printf("Ring modulate input for 20 seconds.\n"); fflush(stdout);
Chris@39:     
Chris@39:     /* initialise sinusoidal wavetable */
Chris@39:     for( i=0; i<100; i++ )
Chris@39:         data.sine[i] = sin( ((double)i/100.) * M_PI * 2. );
Chris@39:     data.phase = 0;
Chris@39:     data.sampsToGo = SAMPLE_RATE * 20;        /* 20 seconds. */
Chris@39: 
Chris@39:     /* initialise portaudio subsytem */
Chris@39:     err = Pa_Initialize();
Chris@39: 
Chris@39:     inputParameters.device = Pa_GetDefaultInputDevice();    /* default input device */
Chris@39:     if (inputParameters.device == paNoDevice) {
Chris@39:       fprintf(stderr,"Error: No input default device.\n");
Chris@39:       goto done;
Chris@39:     }
Chris@39:     inputParameters.channelCount = 2;                       /* stereo input */
Chris@39:     inputParameters.sampleFormat = paFloat32;               /* 32 bit floating point input */
Chris@39:     inputParameters.suggestedLatency = Pa_GetDeviceInfo( inputParameters.device )->defaultLowInputLatency;
Chris@39:     inputParameters.hostApiSpecificStreamInfo = NULL;
Chris@39: 
Chris@39:     outputParameters.device = Pa_GetDefaultOutputDevice();  /* default output device */
Chris@39:     if (outputParameters.device == paNoDevice) {
Chris@39:       fprintf(stderr,"Error: No default output device.\n");
Chris@39:       goto done;
Chris@39:     }
Chris@39:     outputParameters.channelCount = 2;                      /* stereo output */
Chris@39:     outputParameters.sampleFormat = paFloat32;              /* 32 bit floating point output */
Chris@39:     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
Chris@39:     outputParameters.hostApiSpecificStreamInfo = NULL;
Chris@39: 
Chris@39:     err = Pa_OpenStream(
Chris@39:                         &stream,
Chris@39:                         &inputParameters,
Chris@39:                         &outputParameters,
Chris@39:                         (double)SAMPLE_RATE, /* Samplerate in Hertz. */
Chris@39:                         512,                 /* Small buffers */
Chris@39:                         paClipOff,           /* We won't output out of range samples so don't bother clipping them. */
Chris@39:                         patest1Callback,
Chris@39:                         &data );
Chris@39:     if( err != paNoError ) goto done;
Chris@39: 
Chris@39:     err = Pa_StartStream( stream );
Chris@39:     if( err != paNoError ) goto done;
Chris@39:     
Chris@39:     printf( "Press any key to end.\n" ); fflush(stdout);
Chris@39:          
Chris@39:     getc( stdin ); /* wait for input before exiting */
Chris@39: 
Chris@39:     err = Pa_AbortStream( stream );
Chris@39:     if( err != paNoError ) goto done;
Chris@39:     
Chris@39:     printf( "Waiting for stream to complete...\n" );
Chris@39: 
Chris@39:     /* sleep until playback has finished */
Chris@39:     while( ( err = Pa_IsStreamActive( stream ) ) == 1 ) Pa_Sleep(1000);
Chris@39:     if( err < 0 ) goto done;
Chris@39: 
Chris@39:     err = Pa_CloseStream( stream );
Chris@39:     if( err != paNoError ) goto done;
Chris@39: 
Chris@39: done:
Chris@39:     Pa_Terminate();
Chris@39: 
Chris@39:     if( err != paNoError )
Chris@39:     {
Chris@39:         fprintf( stderr, "An error occured while using portaudio\n" );
Chris@39:         if( err == paUnanticipatedHostError )
Chris@39:         {
Chris@39:             fprintf( stderr, " unanticipated host error.\n");
Chris@39:             herr = Pa_GetLastHostErrorInfo();
Chris@39:             if (herr)
Chris@39:             {
Chris@39:                 fprintf( stderr, " Error number: %ld\n", herr->errorCode );
Chris@39:                 if (herr->errorText)
Chris@39:                     fprintf( stderr, " Error text: %s\n", herr->errorText );
Chris@39:             }
Chris@39:             else
Chris@39:                 fprintf( stderr, " Pa_GetLastHostErrorInfo() failed!\n" );
Chris@39:         }
Chris@39:         else
Chris@39:         {
Chris@39:             fprintf( stderr, " Error number: %d\n", err );
Chris@39:             fprintf( stderr, " Error text: %s\n", Pa_GetErrorText( err ) );
Chris@39:         }
Chris@39: 
Chris@39:         err = 1;          /* Always return 0 or 1, but no other return codes. */
Chris@39:     }
Chris@39: 
Chris@39:     printf( "bye\n" );
Chris@39: 
Chris@39:     return err;
Chris@39: }