cannam@140: /** @file patest_sync.c cannam@140: @ingroup test_src cannam@140: @brief Test time stamping and synchronization of audio and video. cannam@140: cannam@140: A high latency is used so we can hear the difference in time. cannam@140: Random durations are used so we know we are hearing the right beep cannam@140: and not the one before or after. cannam@140: cannam@140: Sequence of events: cannam@140: -# Foreground requests a beep. cannam@140: -# Background randomly schedules a beep. cannam@140: -# Foreground waits for the beep to be heard based on PaUtil_GetTime(). cannam@140: -# Foreground outputs video (printf) in sync with audio. cannam@140: -# Repeat. cannam@140: cannam@140: @author Phil Burk http://www.softsynth.com cannam@140: */ cannam@140: /* cannam@140: * $Id$ cannam@140: * cannam@140: * This program uses the PortAudio Portable Audio Library. cannam@140: * For more information see: http://www.portaudio.com cannam@140: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@140: * cannam@140: * Permission is hereby granted, free of charge, to any person obtaining cannam@140: * a copy of this software and associated documentation files cannam@140: * (the "Software"), to deal in the Software without restriction, cannam@140: * including without limitation the rights to use, copy, modify, merge, cannam@140: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@140: * and to permit persons to whom the Software is furnished to do so, cannam@140: * subject to the following conditions: cannam@140: * cannam@140: * The above copyright notice and this permission notice shall be cannam@140: * included in all copies or substantial portions of the Software. cannam@140: * cannam@140: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@140: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@140: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@140: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@140: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@140: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@140: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@140: */ cannam@140: cannam@140: /* cannam@140: * The text above constitutes the entire PortAudio license; however, cannam@140: * the PortAudio community also makes the following non-binding requests: cannam@140: * cannam@140: * Any person wishing to distribute modifications to the Software is cannam@140: * requested to send the modifications to the original developer so that cannam@140: * they can be incorporated into the canonical version. It is also cannam@140: * requested that these non-binding requests be included along with the cannam@140: * license above. cannam@140: */ cannam@140: cannam@140: #include cannam@140: #include cannam@140: #include "portaudio.h" cannam@140: #include "pa_util.h" cannam@140: #define NUM_BEEPS (6) cannam@140: #define SAMPLE_RATE (44100) cannam@140: #define SAMPLE_PERIOD (1.0/44100.0) cannam@140: #define FRAMES_PER_BUFFER (256) cannam@140: #define BEEP_DURATION (400) cannam@140: #define LATENCY_MSEC (2000) cannam@140: #define SLEEP_MSEC (10) cannam@140: #define TIMEOUT_MSEC (15000) cannam@140: cannam@140: #define STATE_BKG_IDLE (0) cannam@140: #define STATE_BKG_PENDING (1) cannam@140: #define STATE_BKG_BEEPING (2) cannam@140: typedef struct cannam@140: { cannam@140: float left_phase; cannam@140: float right_phase; cannam@140: int state; cannam@140: volatile int requestBeep; /* Set by foreground, cleared by background. */ cannam@140: PaTime beepTime; cannam@140: int beepCount; cannam@140: double latency; /* For debugging. */ cannam@140: } cannam@140: paTestData; cannam@140: cannam@140: static unsigned long GenerateRandomNumber( void ); cannam@140: /************************************************************/ cannam@140: /* Calculate pseudo-random 32 bit number based on linear congruential method. */ cannam@140: static unsigned long GenerateRandomNumber( void ) cannam@140: { cannam@140: static unsigned long randSeed = 99887766; /* Change this for different random sequences. */ cannam@140: randSeed = (randSeed * 196314165) + 907633515; cannam@140: return randSeed; cannam@140: } cannam@140: cannam@140: /* This routine will be called by the PortAudio engine when audio is needed. cannam@140: ** It may called at interrupt level on some machines so don't do anything cannam@140: ** that could mess up the system like calling malloc() or free(). cannam@140: */ cannam@140: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@140: unsigned long framesPerBuffer, cannam@140: const PaStreamCallbackTimeInfo *timeInfo, cannam@140: PaStreamCallbackFlags statusFlags, void *userData ) cannam@140: { cannam@140: /* Cast data passed through stream to our structure. */ cannam@140: paTestData *data = (paTestData*)userData; cannam@140: float *out = (float*)outputBuffer; cannam@140: unsigned int i; cannam@140: (void) inputBuffer; cannam@140: cannam@140: data->latency = timeInfo->outputBufferDacTime - timeInfo->currentTime; cannam@140: cannam@140: for( i=0; istate ) cannam@140: { cannam@140: case STATE_BKG_IDLE: cannam@140: /* Schedule beep at some random time in the future. */ cannam@140: if( data->requestBeep ) cannam@140: { cannam@140: int random = GenerateRandomNumber() >> 14; cannam@140: data->beepTime = timeInfo->outputBufferDacTime + (( (double)(random + SAMPLE_RATE)) * SAMPLE_PERIOD ); cannam@140: data->state = STATE_BKG_PENDING; cannam@140: } cannam@140: *out++ = 0.0; /* left */ cannam@140: *out++ = 0.0; /* right */ cannam@140: break; cannam@140: cannam@140: case STATE_BKG_PENDING: cannam@140: if( (timeInfo->outputBufferDacTime + (i*SAMPLE_PERIOD)) >= data->beepTime ) cannam@140: { cannam@140: data->state = STATE_BKG_BEEPING; cannam@140: data->beepCount = BEEP_DURATION; cannam@140: data->left_phase = data->right_phase = 0.0; cannam@140: } cannam@140: *out++ = 0.0; /* left */ cannam@140: *out++ = 0.0; /* right */ cannam@140: break; cannam@140: cannam@140: case STATE_BKG_BEEPING: cannam@140: if( data->beepCount <= 0 ) cannam@140: { cannam@140: data->state = STATE_BKG_IDLE; cannam@140: data->requestBeep = 0; cannam@140: *out++ = 0.0; /* left */ cannam@140: *out++ = 0.0; /* right */ cannam@140: } cannam@140: else cannam@140: { cannam@140: /* Play sawtooth wave. */ cannam@140: *out++ = data->left_phase; /* left */ cannam@140: *out++ = data->right_phase; /* right */ cannam@140: /* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */ cannam@140: data->left_phase += 0.01f; cannam@140: /* When signal reaches top, drop back down. */ cannam@140: if( data->left_phase >= 1.0f ) data->left_phase -= 2.0f; cannam@140: /* higher pitch so we can distinguish left and right. */ cannam@140: data->right_phase += 0.03f; cannam@140: if( data->right_phase >= 1.0f ) data->right_phase -= 2.0f; cannam@140: } cannam@140: data->beepCount -= 1; cannam@140: break; cannam@140: cannam@140: default: cannam@140: data->state = STATE_BKG_IDLE; cannam@140: break; cannam@140: } cannam@140: } cannam@140: return 0; cannam@140: } cannam@140: /*******************************************************************/ cannam@140: int main(void); cannam@140: int main(void) cannam@140: { cannam@140: PaStream *stream; cannam@140: PaError err; cannam@140: paTestData DATA; cannam@140: int i, timeout; cannam@140: PaTime previousTime; cannam@140: PaStreamParameters outputParameters; cannam@140: printf("PortAudio Test: you should see BEEP at the same time you hear it.\n"); cannam@140: printf("Wait for a few seconds random delay between BEEPs.\n"); cannam@140: printf("BEEP %d times.\n", NUM_BEEPS ); cannam@140: /* Initialize our DATA for use by callback. */ cannam@140: DATA.left_phase = DATA.right_phase = 0.0; cannam@140: DATA.state = STATE_BKG_IDLE; cannam@140: DATA.requestBeep = 0; cannam@140: /* Initialize library before making any other calls. */ cannam@140: err = Pa_Initialize(); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: outputParameters.device = Pa_GetDefaultOutputDevice(); cannam@140: if (outputParameters.device == paNoDevice) { cannam@140: fprintf(stderr,"Error: No default output device.\n"); cannam@140: goto error; cannam@140: } cannam@140: outputParameters.channelCount = 2; cannam@140: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@140: outputParameters.sampleFormat = paFloat32; cannam@140: outputParameters.suggestedLatency = (double)LATENCY_MSEC / 1000; cannam@140: cannam@140: /* Open an audio I/O stream. */ cannam@140: err = Pa_OpenStream( cannam@140: &stream, cannam@140: NULL, /* no input */ cannam@140: &outputParameters, cannam@140: SAMPLE_RATE, cannam@140: FRAMES_PER_BUFFER, /* frames per buffer */ cannam@140: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@140: patestCallback, cannam@140: &DATA ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: err = Pa_StartStream( stream ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: printf("started\n"); cannam@140: fflush(stdout); cannam@140: cannam@140: previousTime = Pa_GetStreamTime( stream ); cannam@140: for( i=0; i 0 ) ) Pa_Sleep(SLEEP_MSEC); cannam@140: if( timeout <= 0 ) cannam@140: { cannam@140: fprintf( stderr, "Timed out waiting for background to acknowledge request.\n" ); cannam@140: goto error; cannam@140: } cannam@140: printf("calc beep for %9.3f, latency = %6.3f\n", DATA.beepTime, DATA.latency ); cannam@140: fflush(stdout); cannam@140: cannam@140: /* Wait for scheduled beep time. */ cannam@140: timeout = TIMEOUT_MSEC + (10000/SLEEP_MSEC); cannam@140: while( (Pa_GetStreamTime( stream ) < DATA.beepTime) && (timeout-- > 0 ) ) cannam@140: { cannam@140: Pa_Sleep(SLEEP_MSEC); cannam@140: } cannam@140: if( timeout <= 0 ) cannam@140: { cannam@140: fprintf( stderr, "Timed out waiting for time. Now = %9.3f, Beep for %9.3f.\n", cannam@140: PaUtil_GetTime(), DATA.beepTime ); cannam@140: goto error; cannam@140: } cannam@140: cannam@140: /* Beep should be sounding now so print synchronized BEEP. */ cannam@140: printf("hear \"BEEP\" at %9.3f, delta = %9.3f\n", cannam@140: Pa_GetStreamTime( stream ), (DATA.beepTime - previousTime) ); cannam@140: fflush(stdout); cannam@140: cannam@140: previousTime = DATA.beepTime; cannam@140: } cannam@140: cannam@140: err = Pa_StopStream( stream ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: err = Pa_CloseStream( stream ); cannam@140: if( err != paNoError ) goto error; cannam@140: cannam@140: Pa_Terminate(); cannam@140: printf("Test finished.\n"); cannam@140: return err; cannam@140: error: cannam@140: Pa_Terminate(); cannam@140: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@140: fprintf( stderr, "Error number: %d\n", err ); cannam@140: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@140: return err; cannam@140: }