gearmulator

patest1.c (7095B)

---

 /** @file patest1.c
 	@ingroup test_src
 	@brief Ring modulate the audio input with a sine wave for 20 seconds.
 	@author Ross Bencina <rossb@audiomulch.com>
 */
 /*
  * $Id$
  *
  * 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"
 
 #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 */
     if (inputParameters.device == paNoDevice) {
       fprintf(stderr,"Error: No input default device.\n");
       goto done;
     }
     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 */
     if (outputParameters.device == paNoDevice) {
       fprintf(stderr,"Error: No default output device.\n");
       goto done;
     }
     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 occured 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;
 }