gearmulator

patest_sine_time.c (7176B)

---

 /** @file patest_sine_time.c
 	@ingroup test_src
 	@brief Play a sine wave for several seconds, pausing in the middle.
 	Uses the Pa_GetStreamTime() call.
 	@author Ross Bencina <rossb@audiomulch.com>
 	@author Phil Burk <philburk@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 <math.h>
 
 #include "portaudio.h"
 #include "pa_util.h"
 
 #define NUM_SECONDS   (8)
 #define SAMPLE_RATE   (44100)
 #define FRAMES_PER_BUFFER  (64)
 
 #ifndef M_PI
 #define M_PI  (3.14159265)
 #endif
 #define TWOPI (M_PI * 2.0)
 
 #define TABLE_SIZE   (200)
 
 typedef struct
 {
     double           left_phase;
     double           right_phase;
     volatile PaTime  outTime;
 }
 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;
     float *out = (float*)outputBuffer;
     unsigned int i;
 
     double left_phaseInc = 0.02;
     double right_phaseInc = 0.06;
 
     double left_phase = data->left_phase;
     double right_phase = data->right_phase;
 
     (void) statusFlags; /* Prevent unused variable warnings. */
     (void) inputBuffer;
 
     data->outTime = timeInfo->outputBufferDacTime;
 
     for( i=0; i<framesPerBuffer; i++ )
     {
         left_phase += left_phaseInc;
         if( left_phase > TWOPI ) left_phase -= TWOPI;
         *out++ = (float) sin( left_phase );
 
         right_phase += right_phaseInc;
         if( right_phase > TWOPI ) right_phase -= TWOPI;
         *out++ = (float) sin( right_phase );
     }
 
     data->left_phase = left_phase;
     data->right_phase = right_phase;
 
     return paContinue;
 }
 
 /*******************************************************************/
 static void ReportStreamTime( PaStream *stream, paTestData *data );
 static void ReportStreamTime( PaStream *stream, paTestData *data )
 {
     PaTime  streamTime, latency, outTime;
     
     streamTime = Pa_GetStreamTime( stream );
     outTime = data->outTime;
     if( outTime < 0.0 )
     {
         printf("Stream time = %8.1f\n", streamTime );
     }
     else
     {
         latency = outTime - streamTime;
         printf("Stream time = %8.4f, outTime = %8.4f, latency = %8.4f\n",
             streamTime, outTime, latency );
     }
     fflush(stdout);
 }
 
 /*******************************************************************/
 int main(void);
 int main(void)
 {
     PaStreamParameters outputParameters;
     PaStream *stream;
     PaError err;
     paTestData data;
     PaTime startTime;
 
     printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
 
     data.left_phase = data.right_phase = 0;
 
     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 = paFloat32; /* 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,
               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;
           
     /* Watch until sound is halfway finished. */
     printf("Play for %d seconds.\n", NUM_SECONDS/2 ); fflush(stdout);
 
     data.outTime = -1.0; /* mark time for callback as undefined */
     err = Pa_StartStream( stream );
     if( err != paNoError ) goto error;
 
     startTime = Pa_GetStreamTime( stream );
 
     do
     {
         ReportStreamTime( stream, &data );
         Pa_Sleep(100);
     } while( (Pa_GetStreamTime( stream ) - startTime) < (NUM_SECONDS/2) );
     
     /* Stop sound for 2 seconds. */
     err = Pa_StopStream( stream );
     if( err != paNoError ) goto error;
     
     printf("Pause for 2 seconds.\n"); fflush(stdout);
     Pa_Sleep( 2000 );
 
     data.outTime = -1.0; /* mark time for callback as undefined */
     err = Pa_StartStream( stream );
     if( err != paNoError ) goto error;
 
     startTime = Pa_GetStreamTime( stream );
     
     printf("Play until sound is finished.\n"); fflush(stdout);
     do
     {
         ReportStreamTime( stream, &data );
         Pa_Sleep(100);
     } while( (Pa_GetStreamTime( stream ) - startTime) < (NUM_SECONDS/2) );
     
     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;
 }