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/** @file patest_sync.c
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@brief Test time stamping and synchronization of audio and video.
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A high latency is used so we can hear the difference in time.
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Random durations are used so we know we are hearing the right beep
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and not the one before or after.
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-# Foreground requests a beep.
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-# Background randomly schedules a beep.
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-# Foreground waits for the beep to be heard based on PaUtil_GetTime().
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-# Foreground outputs video (printf) in sync with audio.
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@author Phil Burk http://www.softsynth.com
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* $Id: patest_sync.c,v 1.2 2006/09/23 18:42:52 llucius Exp $
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* This program uses the PortAudio Portable Audio Library.
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* For more information see: http://www.portaudio.com
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* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version. It is also
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* requested that these non-binding requests be included along with the
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#include "portaudio.h"
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#define SAMPLE_RATE (44100)
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#define SAMPLE_PERIOD (1.0/44100.0)
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#define FRAMES_PER_BUFFER (256)
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#define BEEP_DURATION (400)
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#define LATENCY_MSEC (2000)
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#define SLEEP_MSEC (10)
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#define TIMEOUT_MSEC (15000)
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#define STATE_BKG_IDLE (0)
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#define STATE_BKG_PENDING (1)
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#define STATE_BKG_BEEPING (2)
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volatile int requestBeep; /* Set by foreground, cleared by background. */
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double latency; /* For debugging. */
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static unsigned long GenerateRandomNumber( void );
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/************************************************************/
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/* Calculate pseudo-random 32 bit number based on linear congruential method. */
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static unsigned long GenerateRandomNumber( void )
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static unsigned long randSeed = 99887766; /* Change this for different random sequences. */
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randSeed = (randSeed * 196314165) + 907633515;
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/* This routine will be called by the PortAudio engine when audio is needed.
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** It may called at interrupt level on some machines so don't do anything
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** that could mess up the system like calling malloc() or free().
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static int patestCallback( const void *inputBuffer, void *outputBuffer,
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unsigned long framesPerBuffer,
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const PaStreamCallbackTimeInfo *timeInfo,
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PaStreamCallbackFlags statusFlags, void *userData )
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/* Cast data passed through stream to our structure. */
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paTestData *data = (paTestData*)userData;
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float *out = (float*)outputBuffer;
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data->latency = timeInfo->outputBufferDacTime - timeInfo->currentTime;
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for( i=0; i<framesPerBuffer; i++ )
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switch( data->state )
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/* Schedule beep at some random time in the future. */
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if( data->requestBeep )
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int random = GenerateRandomNumber() >> 14;
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data->beepTime = timeInfo->outputBufferDacTime + (( (double)(random + SAMPLE_RATE)) * SAMPLE_PERIOD );
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data->state = STATE_BKG_PENDING;
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*out++ = 0.0; /* left */
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*out++ = 0.0; /* right */
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case STATE_BKG_PENDING:
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if( (timeInfo->outputBufferDacTime + (i*SAMPLE_PERIOD)) >= data->beepTime )
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data->state = STATE_BKG_BEEPING;
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data->beepCount = BEEP_DURATION;
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data->left_phase = data->right_phase = 0.0;
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*out++ = 0.0; /* left */
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*out++ = 0.0; /* right */
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case STATE_BKG_BEEPING:
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if( data->beepCount <= 0 )
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data->state = STATE_BKG_IDLE;
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data->requestBeep = 0;
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*out++ = 0.0; /* left */
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*out++ = 0.0; /* right */
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/* Play sawtooth wave. */
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*out++ = data->left_phase; /* left */
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*out++ = data->right_phase; /* right */
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/* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */
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data->left_phase += 0.01f;
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/* When signal reaches top, drop back down. */
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if( data->left_phase >= 1.0f ) data->left_phase -= 2.0f;
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/* higher pitch so we can distinguish left and right. */
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data->right_phase += 0.03f;
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if( data->right_phase >= 1.0f ) data->right_phase -= 2.0f;
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data->beepCount -= 1;
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data->state = STATE_BKG_IDLE;
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/*******************************************************************/
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PaStreamParameters outputParameters;
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printf("PortAudio Test: you should see BEEP at the same time you hear it.\n");
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printf("Wait for a few seconds random delay between BEEPs.\n");
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printf("BEEP %d times.\n", NUM_BEEPS );
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/* Initialize our DATA for use by callback. */
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DATA.left_phase = DATA.right_phase = 0.0;
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DATA.state = STATE_BKG_IDLE;
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DATA.requestBeep = 0;
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/* Initialize library before making any other calls. */
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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outputParameters.device = Pa_GetDefaultOutputDevice();
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outputParameters.channelCount = 2;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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outputParameters.sampleFormat = paFloat32;
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outputParameters.suggestedLatency = (double)LATENCY_MSEC / 1000;
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/* Open an audio I/O stream. */
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FRAMES_PER_BUFFER, /* frames per buffer */
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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if( err != paNoError ) goto error;
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err = Pa_StartStream( stream );
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if( err != paNoError ) goto error;
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previousTime = Pa_GetStreamTime( stream );
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for( i=0; i<NUM_BEEPS; i++ )
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/* Request a beep from background. */
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DATA.requestBeep = 1;
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/* Wait for background to acknowledge request. */
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timeout = TIMEOUT_MSEC;
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while( (DATA.requestBeep == 1) && (timeout-- > 0 ) ) Pa_Sleep(SLEEP_MSEC);
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fprintf( stderr, "Timed out waiting for background to acknowledge request.\n" );
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printf("calc beep for %9.3f, latency = %6.3f\n", DATA.beepTime, DATA.latency );
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/* Wait for scheduled beep time. */
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timeout = TIMEOUT_MSEC + (10000/SLEEP_MSEC);
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while( (Pa_GetStreamTime( stream ) < DATA.beepTime) && (timeout-- > 0 ) )
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Pa_Sleep(SLEEP_MSEC);
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fprintf( stderr, "Timed out waiting for time. Now = %9.3f, Beep for %9.3f.\n",
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PaUtil_GetTime(), DATA.beepTime );
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/* Beep should be sounding now so print synchronized BEEP. */
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printf("hear \"BEEP\" at %9.3f, delta = %9.3f\n",
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Pa_GetStreamTime( stream ), (DATA.beepTime - previousTime) );
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previousTime = DATA.beepTime;
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err = Pa_StopStream( stream );
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if( err != paNoError ) goto error;
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err = Pa_CloseStream( stream );
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if( err != paNoError ) goto error;
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printf("Test finished.\n");
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fprintf( stderr, "An error occured while using the portaudio stream\n" );
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fprintf( stderr, "Error number: %d\n", err );
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fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
added
removed
lib-src/portaudio-v19/test/patest_sync.c
