cannam@124: /** @file patest_sync.c cannam@124: @ingroup test_src cannam@124: @brief Test time stamping and synchronization of audio and video. cannam@124: cannam@124: A high latency is used so we can hear the difference in time. cannam@124: Random durations are used so we know we are hearing the right beep cannam@124: and not the one before or after. cannam@124: cannam@124: Sequence of events: cannam@124: -# Foreground requests a beep. cannam@124: -# Background randomly schedules a beep. cannam@124: -# Foreground waits for the beep to be heard based on PaUtil_GetTime(). cannam@124: -# Foreground outputs video (printf) in sync with audio. cannam@124: -# Repeat. cannam@124: cannam@124: @author Phil Burk http://www.softsynth.com cannam@124: */ cannam@124: /* cannam@124: * $Id: patest_sync.c 1368 2008-03-01 00:38:27Z rossb $ cannam@124: * cannam@124: * This program uses the PortAudio Portable Audio Library. cannam@124: * For more information see: http://www.portaudio.com cannam@124: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@124: * cannam@124: * Permission is hereby granted, free of charge, to any person obtaining cannam@124: * a copy of this software and associated documentation files cannam@124: * (the "Software"), to deal in the Software without restriction, cannam@124: * including without limitation the rights to use, copy, modify, merge, cannam@124: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@124: * and to permit persons to whom the Software is furnished to do so, cannam@124: * subject to the following conditions: cannam@124: * cannam@124: * The above copyright notice and this permission notice shall be cannam@124: * included in all copies or substantial portions of the Software. cannam@124: * cannam@124: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@124: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@124: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@124: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@124: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@124: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@124: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@124: */ cannam@124: cannam@124: /* cannam@124: * The text above constitutes the entire PortAudio license; however, cannam@124: * the PortAudio community also makes the following non-binding requests: cannam@124: * cannam@124: * Any person wishing to distribute modifications to the Software is cannam@124: * requested to send the modifications to the original developer so that cannam@124: * they can be incorporated into the canonical version. It is also cannam@124: * requested that these non-binding requests be included along with the cannam@124: * license above. cannam@124: */ cannam@124: cannam@124: #include cannam@124: #include cannam@124: #include "portaudio.h" cannam@124: #include "pa_util.h" cannam@124: #define NUM_BEEPS (6) cannam@124: #define SAMPLE_RATE (44100) cannam@124: #define SAMPLE_PERIOD (1.0/44100.0) cannam@124: #define FRAMES_PER_BUFFER (256) cannam@124: #define BEEP_DURATION (400) cannam@124: #define LATENCY_MSEC (2000) cannam@124: #define SLEEP_MSEC (10) cannam@124: #define TIMEOUT_MSEC (15000) cannam@124: cannam@124: #define STATE_BKG_IDLE (0) cannam@124: #define STATE_BKG_PENDING (1) cannam@124: #define STATE_BKG_BEEPING (2) cannam@124: typedef struct cannam@124: { cannam@124: float left_phase; cannam@124: float right_phase; cannam@124: int state; cannam@124: volatile int requestBeep; /* Set by foreground, cleared by background. */ cannam@124: PaTime beepTime; cannam@124: int beepCount; cannam@124: double latency; /* For debugging. */ cannam@124: } cannam@124: paTestData; cannam@124: cannam@124: static unsigned long GenerateRandomNumber( void ); cannam@124: /************************************************************/ cannam@124: /* Calculate pseudo-random 32 bit number based on linear congruential method. */ cannam@124: static unsigned long GenerateRandomNumber( void ) cannam@124: { cannam@124: static unsigned long randSeed = 99887766; /* Change this for different random sequences. */ cannam@124: randSeed = (randSeed * 196314165) + 907633515; cannam@124: return randSeed; cannam@124: } cannam@124: cannam@124: /* This routine will be called by the PortAudio engine when audio is needed. cannam@124: ** It may called at interrupt level on some machines so don't do anything cannam@124: ** that could mess up the system like calling malloc() or free(). cannam@124: */ cannam@124: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@124: unsigned long framesPerBuffer, cannam@124: const PaStreamCallbackTimeInfo *timeInfo, cannam@124: PaStreamCallbackFlags statusFlags, void *userData ) cannam@124: { cannam@124: /* Cast data passed through stream to our structure. */ cannam@124: paTestData *data = (paTestData*)userData; cannam@124: float *out = (float*)outputBuffer; cannam@124: unsigned int i; cannam@124: (void) inputBuffer; cannam@124: cannam@124: data->latency = timeInfo->outputBufferDacTime - timeInfo->currentTime; cannam@124: cannam@124: for( i=0; istate ) cannam@124: { cannam@124: case STATE_BKG_IDLE: cannam@124: /* Schedule beep at some random time in the future. */ cannam@124: if( data->requestBeep ) cannam@124: { cannam@124: int random = GenerateRandomNumber() >> 14; cannam@124: data->beepTime = timeInfo->outputBufferDacTime + (( (double)(random + SAMPLE_RATE)) * SAMPLE_PERIOD ); cannam@124: data->state = STATE_BKG_PENDING; cannam@124: } cannam@124: *out++ = 0.0; /* left */ cannam@124: *out++ = 0.0; /* right */ cannam@124: break; cannam@124: cannam@124: case STATE_BKG_PENDING: cannam@124: if( (timeInfo->outputBufferDacTime + (i*SAMPLE_PERIOD)) >= data->beepTime ) cannam@124: { cannam@124: data->state = STATE_BKG_BEEPING; cannam@124: data->beepCount = BEEP_DURATION; cannam@124: data->left_phase = data->right_phase = 0.0; cannam@124: } cannam@124: *out++ = 0.0; /* left */ cannam@124: *out++ = 0.0; /* right */ cannam@124: break; cannam@124: cannam@124: case STATE_BKG_BEEPING: cannam@124: if( data->beepCount <= 0 ) cannam@124: { cannam@124: data->state = STATE_BKG_IDLE; cannam@124: data->requestBeep = 0; cannam@124: *out++ = 0.0; /* left */ cannam@124: *out++ = 0.0; /* right */ cannam@124: } cannam@124: else cannam@124: { cannam@124: /* Play sawtooth wave. */ cannam@124: *out++ = data->left_phase; /* left */ cannam@124: *out++ = data->right_phase; /* right */ cannam@124: /* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */ cannam@124: data->left_phase += 0.01f; cannam@124: /* When signal reaches top, drop back down. */ cannam@124: if( data->left_phase >= 1.0f ) data->left_phase -= 2.0f; cannam@124: /* higher pitch so we can distinguish left and right. */ cannam@124: data->right_phase += 0.03f; cannam@124: if( data->right_phase >= 1.0f ) data->right_phase -= 2.0f; cannam@124: } cannam@124: data->beepCount -= 1; cannam@124: break; cannam@124: cannam@124: default: cannam@124: data->state = STATE_BKG_IDLE; cannam@124: break; cannam@124: } cannam@124: } cannam@124: return 0; cannam@124: } cannam@124: /*******************************************************************/ cannam@124: int main(void); cannam@124: int main(void) cannam@124: { cannam@124: PaStream *stream; cannam@124: PaError err; cannam@124: paTestData DATA; cannam@124: int i, timeout; cannam@124: PaTime previousTime; cannam@124: PaStreamParameters outputParameters; cannam@124: printf("PortAudio Test: you should see BEEP at the same time you hear it.\n"); cannam@124: printf("Wait for a few seconds random delay between BEEPs.\n"); cannam@124: printf("BEEP %d times.\n", NUM_BEEPS ); cannam@124: /* Initialize our DATA for use by callback. */ cannam@124: DATA.left_phase = DATA.right_phase = 0.0; cannam@124: DATA.state = STATE_BKG_IDLE; cannam@124: DATA.requestBeep = 0; cannam@124: /* Initialize library before making any other calls. */ cannam@124: err = Pa_Initialize(); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: outputParameters.device = Pa_GetDefaultOutputDevice(); cannam@124: if (outputParameters.device == paNoDevice) { cannam@124: fprintf(stderr,"Error: No default output device.\n"); cannam@124: goto error; cannam@124: } cannam@124: outputParameters.channelCount = 2; cannam@124: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@124: outputParameters.sampleFormat = paFloat32; cannam@124: outputParameters.suggestedLatency = (double)LATENCY_MSEC / 1000; cannam@124: cannam@124: /* Open an audio I/O stream. */ cannam@124: err = Pa_OpenStream( cannam@124: &stream, cannam@124: NULL, /* no input */ cannam@124: &outputParameters, cannam@124: SAMPLE_RATE, cannam@124: FRAMES_PER_BUFFER, /* frames per buffer */ cannam@124: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@124: patestCallback, cannam@124: &DATA ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: err = Pa_StartStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: printf("started\n"); cannam@124: fflush(stdout); cannam@124: cannam@124: previousTime = Pa_GetStreamTime( stream ); cannam@124: for( i=0; i 0 ) ) Pa_Sleep(SLEEP_MSEC); cannam@124: if( timeout <= 0 ) cannam@124: { cannam@124: fprintf( stderr, "Timed out waiting for background to acknowledge request.\n" ); cannam@124: goto error; cannam@124: } cannam@124: printf("calc beep for %9.3f, latency = %6.3f\n", DATA.beepTime, DATA.latency ); cannam@124: fflush(stdout); cannam@124: cannam@124: /* Wait for scheduled beep time. */ cannam@124: timeout = TIMEOUT_MSEC + (10000/SLEEP_MSEC); cannam@124: while( (Pa_GetStreamTime( stream ) < DATA.beepTime) && (timeout-- > 0 ) ) cannam@124: { cannam@124: Pa_Sleep(SLEEP_MSEC); cannam@124: } cannam@124: if( timeout <= 0 ) cannam@124: { cannam@124: fprintf( stderr, "Timed out waiting for time. Now = %9.3f, Beep for %9.3f.\n", cannam@124: PaUtil_GetTime(), DATA.beepTime ); cannam@124: goto error; cannam@124: } cannam@124: cannam@124: /* Beep should be sounding now so print synchronized BEEP. */ cannam@124: printf("hear \"BEEP\" at %9.3f, delta = %9.3f\n", cannam@124: Pa_GetStreamTime( stream ), (DATA.beepTime - previousTime) ); cannam@124: fflush(stdout); cannam@124: cannam@124: previousTime = DATA.beepTime; cannam@124: } cannam@124: cannam@124: err = Pa_StopStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: err = Pa_CloseStream( stream ); cannam@124: if( err != paNoError ) goto error; cannam@124: cannam@124: Pa_Terminate(); cannam@124: printf("Test finished.\n"); cannam@124: return err; cannam@124: error: cannam@124: Pa_Terminate(); cannam@124: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@124: fprintf( stderr, "Error number: %d\n", err ); cannam@124: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@124: return err; cannam@124: }