gearmulator

patest_sine8.c (7235B)

---

 /** @file patest_sine8.c
 	@ingroup test_src
 	@brief Test 8 bit data: play a sine wave for several 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"
 
 #define NUM_SECONDS   (8)
 #define SAMPLE_RATE   (44100)
 #define TABLE_SIZE    (200)
 #define TEST_UNSIGNED (0)
 
 #if TEST_UNSIGNED
 #define TEST_FORMAT   paUInt8
 typedef unsigned char sample_t;
 #define SILENCE       ((sample_t)0x80)
 #else
 #define TEST_FORMAT   paInt8
 typedef char          sample_t;
 #define SILENCE       ((sample_t)0x00)
 #endif
 
 #ifndef M_PI
 #define M_PI (3.14159265)
 #endif
 
 typedef struct
 {
     sample_t sine[TABLE_SIZE];
     int left_phase;
     int right_phase;
     unsigned int framesToGo;
 }
 paTestData;
 
 /* 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 patestCallback( const void *inputBuffer, void *outputBuffer,
                            unsigned long framesPerBuffer,
                            const PaStreamCallbackTimeInfo* timeInfo,
                            PaStreamCallbackFlags statusFlags,
                            void *userData )
 {
     paTestData *data = (paTestData*)userData;
     sample_t *out = (sample_t*)outputBuffer;
     int i;
     int framesToCalc;
     int finished = 0;
     (void) inputBuffer; /* Prevent unused variable warnings. */
 
     if( data->framesToGo < framesPerBuffer )
     {
         framesToCalc = data->framesToGo;
         data->framesToGo = 0;
         finished = 1;
     }
     else
     {
         framesToCalc = framesPerBuffer;
         data->framesToGo -= framesPerBuffer;
     }
 
     for( i=0; i<framesToCalc; 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<(int)framesPerBuffer; i++ )
     {
         *out++ = SILENCE; /* left */
         *out++ = SILENCE; /* right */
     }
     return finished;
 }
 
 /*******************************************************************/
 int main(void);
 int main(void)
 {
     PaStreamParameters  outputParameters;
     PaStream*           stream;
     PaError             err;
     paTestData          data;
     PaTime              streamOpened;
     int                 i, totalSamps;
 
 #if TEST_UNSIGNED
     printf("PortAudio Test: output UNsigned 8 bit sine wave.\n");
 #else
     printf("PortAudio Test: output signed 8 bit sine wave.\n");
 #endif
     /* initialise sinusoidal wavetable */
     for( i=0; i<TABLE_SIZE; i++ )
     {
         data.sine[i] = SILENCE + (char) (127.0 * sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. ));
     }
     data.left_phase = data.right_phase = 0;
     data.framesToGo = totalSamps =  NUM_SECONDS * SAMPLE_RATE; /* Play for a few seconds. */
 
     err = Pa_Initialize();
     if( err != paNoError )
         goto error;
 
     outputParameters.device = Pa_GetDefaultOutputDevice(); /* Default output device. */
     if (outputParameters.device == paNoDevice) {
       fprintf(stderr,"Error: No default output device.\n");
       goto error;
     }
     outputParameters.channelCount = 2;                     /* Stereo output. */
     outputParameters.sampleFormat = TEST_FORMAT;
     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
     outputParameters.hostApiSpecificStreamInfo = NULL;
     err = Pa_OpenStream( &stream,
                          NULL,      /* No input. */
                          &outputParameters,
                          SAMPLE_RATE,
                          256,       /* Frames per buffer. */
                          paClipOff, /* We won't output out of range samples so don't bother clipping them. */
                          patestCallback,
                          &data );
     if( err != paNoError )
         goto error;
 
     streamOpened = Pa_GetStreamTime( stream ); /* Time in seconds when stream was opened (approx). */
 
     err = Pa_StartStream( stream );
     if( err != paNoError )
         goto error;
 
     /* Watch until sound is halfway finished. */
     /* (Was ( Pa_StreamTime( stream ) < (totalSamps/2) ) in V18. */
     while( (Pa_GetStreamTime( stream ) - streamOpened) < (PaTime)NUM_SECONDS / 2.0 )
         Pa_Sleep(10);
 
     /* Stop sound. */
     printf("Stopping Stream.\n");
     err = Pa_StopStream( stream );
     if( err != paNoError )
         goto error;
 
     printf("Pause for 2 seconds.\n");
     Pa_Sleep( 2000 );
 
     printf("Starting again.\n");
     err = Pa_StartStream( stream );
     if( err != paNoError )
         goto error;
 
     printf("Waiting for sound to finish.\n");
 
     while( ( err = Pa_IsStreamActive( stream ) ) == 1 )
         Pa_Sleep(100);
     if( err < 0 )
         goto error;
 
     err = Pa_CloseStream( stream );
     if( err != paNoError )
         goto error;
 
     Pa_Terminate();
     printf("Test finished.\n");
     return err;
 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 ) );
     return err;
 }