cannam@89: /** @file patest_sync.c cannam@89: @ingroup test_src cannam@89: @brief Test time stamping and synchronization of audio and video. cannam@89: cannam@89: A high latency is used so we can hear the difference in time. cannam@89: Random durations are used so we know we are hearing the right beep cannam@89: and not the one before or after. cannam@89: cannam@89: Sequence of events: cannam@89: -# Foreground requests a beep. cannam@89: -# Background randomly schedules a beep. cannam@89: -# Foreground waits for the beep to be heard based on PaUtil_GetTime(). cannam@89: -# Foreground outputs video (printf) in sync with audio. cannam@89: -# Repeat. cannam@89: cannam@89: @author Phil Burk http://www.softsynth.com cannam@89: */ cannam@89: /* cannam@89: * $Id: patest_sync.c 1368 2008-03-01 00:38:27Z rossb $ cannam@89: * cannam@89: * This program uses the PortAudio Portable Audio Library. cannam@89: * For more information see: http://www.portaudio.com cannam@89: * Copyright (c) 1999-2000 Ross Bencina and Phil Burk cannam@89: * cannam@89: * Permission is hereby granted, free of charge, to any person obtaining cannam@89: * a copy of this software and associated documentation files cannam@89: * (the "Software"), to deal in the Software without restriction, cannam@89: * including without limitation the rights to use, copy, modify, merge, cannam@89: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@89: * and to permit persons to whom the Software is furnished to do so, cannam@89: * subject to the following conditions: cannam@89: * cannam@89: * The above copyright notice and this permission notice shall be cannam@89: * included in all copies or substantial portions of the Software. cannam@89: * cannam@89: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@89: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@89: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@89: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@89: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@89: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@89: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@89: */ cannam@89: cannam@89: /* cannam@89: * The text above constitutes the entire PortAudio license; however, cannam@89: * the PortAudio community also makes the following non-binding requests: cannam@89: * cannam@89: * Any person wishing to distribute modifications to the Software is cannam@89: * requested to send the modifications to the original developer so that cannam@89: * they can be incorporated into the canonical version. It is also cannam@89: * requested that these non-binding requests be included along with the cannam@89: * license above. cannam@89: */ cannam@89: cannam@89: #include cannam@89: #include cannam@89: #include "portaudio.h" cannam@89: #include "pa_util.h" cannam@89: #define NUM_BEEPS (6) cannam@89: #define SAMPLE_RATE (44100) cannam@89: #define SAMPLE_PERIOD (1.0/44100.0) cannam@89: #define FRAMES_PER_BUFFER (256) cannam@89: #define BEEP_DURATION (400) cannam@89: #define LATENCY_MSEC (2000) cannam@89: #define SLEEP_MSEC (10) cannam@89: #define TIMEOUT_MSEC (15000) cannam@89: cannam@89: #define STATE_BKG_IDLE (0) cannam@89: #define STATE_BKG_PENDING (1) cannam@89: #define STATE_BKG_BEEPING (2) cannam@89: typedef struct cannam@89: { cannam@89: float left_phase; cannam@89: float right_phase; cannam@89: int state; cannam@89: volatile int requestBeep; /* Set by foreground, cleared by background. */ cannam@89: PaTime beepTime; cannam@89: int beepCount; cannam@89: double latency; /* For debugging. */ cannam@89: } cannam@89: paTestData; cannam@89: cannam@89: static unsigned long GenerateRandomNumber( void ); cannam@89: /************************************************************/ cannam@89: /* Calculate pseudo-random 32 bit number based on linear congruential method. */ cannam@89: static unsigned long GenerateRandomNumber( void ) cannam@89: { cannam@89: static unsigned long randSeed = 99887766; /* Change this for different random sequences. */ cannam@89: randSeed = (randSeed * 196314165) + 907633515; cannam@89: return randSeed; cannam@89: } cannam@89: cannam@89: /* This routine will be called by the PortAudio engine when audio is needed. cannam@89: ** It may called at interrupt level on some machines so don't do anything cannam@89: ** that could mess up the system like calling malloc() or free(). cannam@89: */ cannam@89: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@89: unsigned long framesPerBuffer, cannam@89: const PaStreamCallbackTimeInfo *timeInfo, cannam@89: PaStreamCallbackFlags statusFlags, void *userData ) cannam@89: { cannam@89: /* Cast data passed through stream to our structure. */ cannam@89: paTestData *data = (paTestData*)userData; cannam@89: float *out = (float*)outputBuffer; cannam@89: unsigned int i; cannam@89: (void) inputBuffer; cannam@89: cannam@89: data->latency = timeInfo->outputBufferDacTime - timeInfo->currentTime; cannam@89: cannam@89: for( i=0; istate ) cannam@89: { cannam@89: case STATE_BKG_IDLE: cannam@89: /* Schedule beep at some random time in the future. */ cannam@89: if( data->requestBeep ) cannam@89: { cannam@89: int random = GenerateRandomNumber() >> 14; cannam@89: data->beepTime = timeInfo->outputBufferDacTime + (( (double)(random + SAMPLE_RATE)) * SAMPLE_PERIOD ); cannam@89: data->state = STATE_BKG_PENDING; cannam@89: } cannam@89: *out++ = 0.0; /* left */ cannam@89: *out++ = 0.0; /* right */ cannam@89: break; cannam@89: cannam@89: case STATE_BKG_PENDING: cannam@89: if( (timeInfo->outputBufferDacTime + (i*SAMPLE_PERIOD)) >= data->beepTime ) cannam@89: { cannam@89: data->state = STATE_BKG_BEEPING; cannam@89: data->beepCount = BEEP_DURATION; cannam@89: data->left_phase = data->right_phase = 0.0; cannam@89: } cannam@89: *out++ = 0.0; /* left */ cannam@89: *out++ = 0.0; /* right */ cannam@89: break; cannam@89: cannam@89: case STATE_BKG_BEEPING: cannam@89: if( data->beepCount <= 0 ) cannam@89: { cannam@89: data->state = STATE_BKG_IDLE; cannam@89: data->requestBeep = 0; cannam@89: *out++ = 0.0; /* left */ cannam@89: *out++ = 0.0; /* right */ cannam@89: } cannam@89: else cannam@89: { cannam@89: /* Play sawtooth wave. */ cannam@89: *out++ = data->left_phase; /* left */ cannam@89: *out++ = data->right_phase; /* right */ cannam@89: /* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */ cannam@89: data->left_phase += 0.01f; cannam@89: /* When signal reaches top, drop back down. */ cannam@89: if( data->left_phase >= 1.0f ) data->left_phase -= 2.0f; cannam@89: /* higher pitch so we can distinguish left and right. */ cannam@89: data->right_phase += 0.03f; cannam@89: if( data->right_phase >= 1.0f ) data->right_phase -= 2.0f; cannam@89: } cannam@89: data->beepCount -= 1; cannam@89: break; cannam@89: cannam@89: default: cannam@89: data->state = STATE_BKG_IDLE; cannam@89: break; cannam@89: } cannam@89: } cannam@89: return 0; cannam@89: } cannam@89: /*******************************************************************/ cannam@89: int main(void); cannam@89: int main(void) cannam@89: { cannam@89: PaStream *stream; cannam@89: PaError err; cannam@89: paTestData DATA; cannam@89: int i, timeout; cannam@89: PaTime previousTime; cannam@89: PaStreamParameters outputParameters; cannam@89: printf("PortAudio Test: you should see BEEP at the same time you hear it.\n"); cannam@89: printf("Wait for a few seconds random delay between BEEPs.\n"); cannam@89: printf("BEEP %d times.\n", NUM_BEEPS ); cannam@89: /* Initialize our DATA for use by callback. */ cannam@89: DATA.left_phase = DATA.right_phase = 0.0; cannam@89: DATA.state = STATE_BKG_IDLE; cannam@89: DATA.requestBeep = 0; cannam@89: /* Initialize library before making any other calls. */ cannam@89: err = Pa_Initialize(); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: outputParameters.device = Pa_GetDefaultOutputDevice(); cannam@89: if (outputParameters.device == paNoDevice) { cannam@89: fprintf(stderr,"Error: No default output device.\n"); cannam@89: goto error; cannam@89: } cannam@89: outputParameters.channelCount = 2; cannam@89: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@89: outputParameters.sampleFormat = paFloat32; cannam@89: outputParameters.suggestedLatency = (double)LATENCY_MSEC / 1000; cannam@89: cannam@89: /* Open an audio I/O stream. */ cannam@89: err = Pa_OpenStream( cannam@89: &stream, cannam@89: NULL, /* no input */ cannam@89: &outputParameters, cannam@89: SAMPLE_RATE, cannam@89: FRAMES_PER_BUFFER, /* frames per buffer */ cannam@89: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@89: patestCallback, cannam@89: &DATA ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: err = Pa_StartStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: printf("started\n"); cannam@89: fflush(stdout); cannam@89: cannam@89: previousTime = Pa_GetStreamTime( stream ); cannam@89: for( i=0; i 0 ) ) Pa_Sleep(SLEEP_MSEC); cannam@89: if( timeout <= 0 ) cannam@89: { cannam@89: fprintf( stderr, "Timed out waiting for background to acknowledge request.\n" ); cannam@89: goto error; cannam@89: } cannam@89: printf("calc beep for %9.3f, latency = %6.3f\n", DATA.beepTime, DATA.latency ); cannam@89: fflush(stdout); cannam@89: cannam@89: /* Wait for scheduled beep time. */ cannam@89: timeout = TIMEOUT_MSEC + (10000/SLEEP_MSEC); cannam@89: while( (Pa_GetStreamTime( stream ) < DATA.beepTime) && (timeout-- > 0 ) ) cannam@89: { cannam@89: Pa_Sleep(SLEEP_MSEC); cannam@89: } cannam@89: if( timeout <= 0 ) cannam@89: { cannam@89: fprintf( stderr, "Timed out waiting for time. Now = %9.3f, Beep for %9.3f.\n", cannam@89: PaUtil_GetTime(), DATA.beepTime ); cannam@89: goto error; cannam@89: } cannam@89: cannam@89: /* Beep should be sounding now so print synchronized BEEP. */ cannam@89: printf("hear \"BEEP\" at %9.3f, delta = %9.3f\n", cannam@89: Pa_GetStreamTime( stream ), (DATA.beepTime - previousTime) ); cannam@89: fflush(stdout); cannam@89: cannam@89: previousTime = DATA.beepTime; cannam@89: } cannam@89: cannam@89: err = Pa_StopStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: err = Pa_CloseStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: Pa_Terminate(); cannam@89: printf("Test finished.\n"); cannam@89: return err; cannam@89: error: cannam@89: Pa_Terminate(); cannam@89: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@89: fprintf( stderr, "Error number: %d\n", err ); cannam@89: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@89: return err; cannam@89: }