gearmulator

patest_buffer.c (7284B)

---

 /** @file patest_buffer.c
 	@ingroup test_src
 	@brief Test opening streams with different buffer sizes.
 	@author Phil Burk  http://www.softsynth.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 <stdlib.h>
 #include <math.h>
 #include "portaudio.h"
 #define NUM_SECONDS   (3)
 #define SAMPLE_RATE   (44100)
 #ifndef M_PI
 #define M_PI  (3.14159265)
 #endif
 #define TABLE_SIZE   (200)
 
 #define BUFFER_TABLE  14
 long buffer_table[] = {paFramesPerBufferUnspecified,16,32,64,128,200,256,500,512,600,723,1000,1024,2345};
 
 typedef struct
 {
     short sine[TABLE_SIZE];
     int left_phase;
     int right_phase;
     unsigned int sampsToGo;
 }
 paTestData;
 PaError TestOnce( int buffersize, PaDeviceIndex );
 
 /* This routine will be called by the PortAudio engine when audio is needed.
 ** It may called at interrupt level on some machines so don't do anything
 ** that could mess up the system like calling malloc() or free().
 */
 static int patest1Callback( const void *inputBuffer, void *outputBuffer,
                             unsigned long framesPerBuffer,
                             const PaStreamCallbackTimeInfo* timeInfo,
                             PaStreamCallbackFlags statusFlags,
                             void *userData )
 {
     paTestData *data = (paTestData*)userData;
     short *out = (short*)outputBuffer;
     unsigned int i;
     int finished = 0;
     (void) inputBuffer; /* Prevent "unused variable" warnings. */
 
     if( data->sampsToGo < framesPerBuffer )
     {
         /* final buffer... */
 
         for( i=0; i<data->sampsToGo; i++ )
         {
             *out++ = data->sine[data->left_phase];  /* left */
             *out++ = data->sine[data->right_phase];  /* right */
             data->left_phase += 1;
             if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
             data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
             if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
         }
         /* zero remainder of final buffer */
         for( ; i<framesPerBuffer; i++ )
         {
             *out++ = 0; /* left */
             *out++ = 0; /* right */
         }
 
         finished = 1;
     }
     else
     {
         for( i=0; i<framesPerBuffer; i++ )
         {
             *out++ = data->sine[data->left_phase];  /* left */
             *out++ = data->sine[data->right_phase];  /* right */
             data->left_phase += 1;
             if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
             data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
             if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
         }
         data->sampsToGo -= framesPerBuffer;
     }
     return finished;
 }
 
 /*******************************************************************/
 int main(int argc, char **args);
 int main(int argc, char **args)
 {
     int i;
     int device = -1;
     PaError err;
     printf("Test opening streams with different buffer sizes\n");
     if( argc > 1 ) {
        device=atoi( args[1] );
        printf("Using device number %d.\n\n", device );
     } else {
        printf("Using default device.\n\n" );
     }
 
     for (i = 0 ; i < BUFFER_TABLE; i++)
     {
         printf("Buffer size %ld\n", buffer_table[i]);
         err = TestOnce(buffer_table[i], device);
         if( err < 0 ) return 0;
 
     }
     return 0;
 }
 
 
 PaError TestOnce( int buffersize, PaDeviceIndex device )
 {
     PaStreamParameters outputParameters;
     PaStream *stream;
     PaError err;
     paTestData data;
     int i;
     int totalSamps;
     /* initialise sinusoidal wavetable */
     for( i=0; i<TABLE_SIZE; i++ )
     {
         data.sine[i] = (short) (32767.0 * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ));
     }
     data.left_phase = data.right_phase = 0;
     data.sampsToGo = totalSamps =  NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */
     err = Pa_Initialize();
     if( err != paNoError ) goto error;
     
     if( device == -1 )
         outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
     else
         outputParameters.device = device ;
 
     if (outputParameters.device == paNoDevice) {
       fprintf(stderr,"Error: No default output device.\n");
       goto error;
     }
 
     outputParameters.channelCount = 2;                      /* stereo output */
     outputParameters.sampleFormat = paInt16;                /* 32 bit floating point output */
     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
     outputParameters.hostApiSpecificStreamInfo = NULL;
     err = Pa_OpenStream(
               &stream,
               NULL,                         /* no input */
               &outputParameters,
               SAMPLE_RATE,
               buffersize,                   /* frames per buffer */
               (paClipOff | paDitherOff),
               patest1Callback,
               &data );
     if( err != paNoError ) goto error;
 
     err = Pa_StartStream( stream );
     if( err != paNoError ) goto error;
     printf("Waiting for sound to finish.\n");
     Pa_Sleep(1000*NUM_SECONDS);
     err = Pa_CloseStream( stream );
     if( err != paNoError ) goto error;
     Pa_Terminate();
     return paNoError;
 error:
     Pa_Terminate();
     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 ) );
     fprintf( stderr, "Host Error message: %s\n", Pa_GetLastHostErrorInfo()->errorText );
     return err;
 }