cannam@162: /** @file patest_sync.c cannam@162: @ingroup test_src cannam@162: @brief Test time stamping and synchronization of audio and video. cannam@162: cannam@162: A high latency is used so we can hear the difference in time. cannam@162: Random durations are used so we know we are hearing the right beep cannam@162: and not the one before or after. cannam@162: cannam@162: Sequence of events: cannam@162: -# Foreground requests a beep. cannam@162: -# Background randomly schedules a beep. cannam@162: -# Foreground waits for the beep to be heard based on PaUtil_GetTime(). cannam@162: -# Foreground outputs video (printf) in sync with audio. cannam@162: -# Repeat. cannam@162: cannam@162: @author Phil Burk http://www.softsynth.com cannam@162: */ cannam@162: /* cannam@162: * $Id$ cannam@162: * cannam@162: * This program uses the PortAudio Portable Audio Library. cannam@162: * For more information see: http://www.portaudio.com cannam@162: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@162: * cannam@162: * Permission is hereby granted, free of charge, to any person obtaining cannam@162: * a copy of this software and associated documentation files cannam@162: * (the "Software"), to deal in the Software without restriction, cannam@162: * including without limitation the rights to use, copy, modify, merge, cannam@162: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@162: * and to permit persons to whom the Software is furnished to do so, cannam@162: * subject to the following conditions: cannam@162: * cannam@162: * The above copyright notice and this permission notice shall be cannam@162: * included in all copies or substantial portions of the Software. cannam@162: * cannam@162: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@162: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@162: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@162: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@162: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@162: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@162: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@162: */ cannam@162: cannam@162: /* cannam@162: * The text above constitutes the entire PortAudio license; however, cannam@162: * the PortAudio community also makes the following non-binding requests: cannam@162: * cannam@162: * Any person wishing to distribute modifications to the Software is cannam@162: * requested to send the modifications to the original developer so that cannam@162: * they can be incorporated into the canonical version. It is also cannam@162: * requested that these non-binding requests be included along with the cannam@162: * license above. cannam@162: */ cannam@162: cannam@162: #include cannam@162: #include cannam@162: #include "portaudio.h" cannam@162: #include "pa_util.h" cannam@162: #define NUM_BEEPS (6) cannam@162: #define SAMPLE_RATE (44100) cannam@162: #define SAMPLE_PERIOD (1.0/44100.0) cannam@162: #define FRAMES_PER_BUFFER (256) cannam@162: #define BEEP_DURATION (400) cannam@162: #define LATENCY_MSEC (2000) cannam@162: #define SLEEP_MSEC (10) cannam@162: #define TIMEOUT_MSEC (15000) cannam@162: cannam@162: #define STATE_BKG_IDLE (0) cannam@162: #define STATE_BKG_PENDING (1) cannam@162: #define STATE_BKG_BEEPING (2) cannam@162: typedef struct cannam@162: { cannam@162: float left_phase; cannam@162: float right_phase; cannam@162: int state; cannam@162: volatile int requestBeep; /* Set by foreground, cleared by background. */ cannam@162: PaTime beepTime; cannam@162: int beepCount; cannam@162: double latency; /* For debugging. */ cannam@162: } cannam@162: paTestData; cannam@162: cannam@162: static unsigned long GenerateRandomNumber( void ); cannam@162: /************************************************************/ cannam@162: /* Calculate pseudo-random 32 bit number based on linear congruential method. */ cannam@162: static unsigned long GenerateRandomNumber( void ) cannam@162: { cannam@162: static unsigned long randSeed = 99887766; /* Change this for different random sequences. */ cannam@162: randSeed = (randSeed * 196314165) + 907633515; cannam@162: return randSeed; cannam@162: } cannam@162: cannam@162: /* This routine will be called by the PortAudio engine when audio is needed. cannam@162: ** It may called at interrupt level on some machines so don't do anything cannam@162: ** that could mess up the system like calling malloc() or free(). cannam@162: */ cannam@162: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@162: unsigned long framesPerBuffer, cannam@162: const PaStreamCallbackTimeInfo *timeInfo, cannam@162: PaStreamCallbackFlags statusFlags, void *userData ) cannam@162: { cannam@162: /* Cast data passed through stream to our structure. */ cannam@162: paTestData *data = (paTestData*)userData; cannam@162: float *out = (float*)outputBuffer; cannam@162: unsigned int i; cannam@162: (void) inputBuffer; cannam@162: cannam@162: data->latency = timeInfo->outputBufferDacTime - timeInfo->currentTime; cannam@162: cannam@162: for( i=0; istate ) cannam@162: { cannam@162: case STATE_BKG_IDLE: cannam@162: /* Schedule beep at some random time in the future. */ cannam@162: if( data->requestBeep ) cannam@162: { cannam@162: int random = GenerateRandomNumber() >> 14; cannam@162: data->beepTime = timeInfo->outputBufferDacTime + (( (double)(random + SAMPLE_RATE)) * SAMPLE_PERIOD ); cannam@162: data->state = STATE_BKG_PENDING; cannam@162: } cannam@162: *out++ = 0.0; /* left */ cannam@162: *out++ = 0.0; /* right */ cannam@162: break; cannam@162: cannam@162: case STATE_BKG_PENDING: cannam@162: if( (timeInfo->outputBufferDacTime + (i*SAMPLE_PERIOD)) >= data->beepTime ) cannam@162: { cannam@162: data->state = STATE_BKG_BEEPING; cannam@162: data->beepCount = BEEP_DURATION; cannam@162: data->left_phase = data->right_phase = 0.0; cannam@162: } cannam@162: *out++ = 0.0; /* left */ cannam@162: *out++ = 0.0; /* right */ cannam@162: break; cannam@162: cannam@162: case STATE_BKG_BEEPING: cannam@162: if( data->beepCount <= 0 ) cannam@162: { cannam@162: data->state = STATE_BKG_IDLE; cannam@162: data->requestBeep = 0; cannam@162: *out++ = 0.0; /* left */ cannam@162: *out++ = 0.0; /* right */ cannam@162: } cannam@162: else cannam@162: { cannam@162: /* Play sawtooth wave. */ cannam@162: *out++ = data->left_phase; /* left */ cannam@162: *out++ = data->right_phase; /* right */ cannam@162: /* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */ cannam@162: data->left_phase += 0.01f; cannam@162: /* When signal reaches top, drop back down. */ cannam@162: if( data->left_phase >= 1.0f ) data->left_phase -= 2.0f; cannam@162: /* higher pitch so we can distinguish left and right. */ cannam@162: data->right_phase += 0.03f; cannam@162: if( data->right_phase >= 1.0f ) data->right_phase -= 2.0f; cannam@162: } cannam@162: data->beepCount -= 1; cannam@162: break; cannam@162: cannam@162: default: cannam@162: data->state = STATE_BKG_IDLE; cannam@162: break; cannam@162: } cannam@162: } cannam@162: return 0; cannam@162: } cannam@162: /*******************************************************************/ cannam@162: int main(void); cannam@162: int main(void) cannam@162: { cannam@162: PaStream *stream; cannam@162: PaError err; cannam@162: paTestData DATA; cannam@162: int i, timeout; cannam@162: PaTime previousTime; cannam@162: PaStreamParameters outputParameters; cannam@162: printf("PortAudio Test: you should see BEEP at the same time you hear it.\n"); cannam@162: printf("Wait for a few seconds random delay between BEEPs.\n"); cannam@162: printf("BEEP %d times.\n", NUM_BEEPS ); cannam@162: /* Initialize our DATA for use by callback. */ cannam@162: DATA.left_phase = DATA.right_phase = 0.0; cannam@162: DATA.state = STATE_BKG_IDLE; cannam@162: DATA.requestBeep = 0; cannam@162: /* Initialize library before making any other calls. */ cannam@162: err = Pa_Initialize(); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: outputParameters.device = Pa_GetDefaultOutputDevice(); cannam@162: if (outputParameters.device == paNoDevice) { cannam@162: fprintf(stderr,"Error: No default output device.\n"); cannam@162: goto error; cannam@162: } cannam@162: outputParameters.channelCount = 2; cannam@162: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@162: outputParameters.sampleFormat = paFloat32; cannam@162: outputParameters.suggestedLatency = (double)LATENCY_MSEC / 1000; cannam@162: cannam@162: /* Open an audio I/O stream. */ cannam@162: err = Pa_OpenStream( cannam@162: &stream, cannam@162: NULL, /* no input */ cannam@162: &outputParameters, cannam@162: SAMPLE_RATE, cannam@162: FRAMES_PER_BUFFER, /* frames per buffer */ cannam@162: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@162: patestCallback, cannam@162: &DATA ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: err = Pa_StartStream( stream ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: printf("started\n"); cannam@162: fflush(stdout); cannam@162: cannam@162: previousTime = Pa_GetStreamTime( stream ); cannam@162: for( i=0; i 0 ) ) Pa_Sleep(SLEEP_MSEC); cannam@162: if( timeout <= 0 ) cannam@162: { cannam@162: fprintf( stderr, "Timed out waiting for background to acknowledge request.\n" ); cannam@162: goto error; cannam@162: } cannam@162: printf("calc beep for %9.3f, latency = %6.3f\n", DATA.beepTime, DATA.latency ); cannam@162: fflush(stdout); cannam@162: cannam@162: /* Wait for scheduled beep time. */ cannam@162: timeout = TIMEOUT_MSEC + (10000/SLEEP_MSEC); cannam@162: while( (Pa_GetStreamTime( stream ) < DATA.beepTime) && (timeout-- > 0 ) ) cannam@162: { cannam@162: Pa_Sleep(SLEEP_MSEC); cannam@162: } cannam@162: if( timeout <= 0 ) cannam@162: { cannam@162: fprintf( stderr, "Timed out waiting for time. Now = %9.3f, Beep for %9.3f.\n", cannam@162: PaUtil_GetTime(), DATA.beepTime ); cannam@162: goto error; cannam@162: } cannam@162: cannam@162: /* Beep should be sounding now so print synchronized BEEP. */ cannam@162: printf("hear \"BEEP\" at %9.3f, delta = %9.3f\n", cannam@162: Pa_GetStreamTime( stream ), (DATA.beepTime - previousTime) ); cannam@162: fflush(stdout); cannam@162: cannam@162: previousTime = DATA.beepTime; cannam@162: } cannam@162: cannam@162: err = Pa_StopStream( stream ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: err = Pa_CloseStream( stream ); cannam@162: if( err != paNoError ) goto error; cannam@162: cannam@162: Pa_Terminate(); cannam@162: printf("Test finished.\n"); cannam@162: return err; cannam@162: error: cannam@162: Pa_Terminate(); cannam@162: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@162: fprintf( stderr, "Error number: %d\n", err ); cannam@162: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@162: return err; cannam@162: }