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authorsanine <sanine.not@pm.me>2022-08-25 14:54:53 -0500
committersanine <sanine.not@pm.me>2022-08-25 14:54:53 -0500
commit37c97e345d12f95dde44e1d1a4c2f2aadd4615bc (patch)
treee1bb25bc855883062bdd7847ff2c04290f71c840 /portaudio/test/patest_sync.c
parent5634c7b04da619669f2f29f6798c03982be05180 (diff)
add initial structure
Diffstat (limited to 'portaudio/test/patest_sync.c')
-rw-r--r--portaudio/test/patest_sync.c271
1 files changed, 271 insertions, 0 deletions
diff --git a/portaudio/test/patest_sync.c b/portaudio/test/patest_sync.c
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+++ b/portaudio/test/patest_sync.c
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+/** @file patest_sync.c
+ @ingroup test_src
+ @brief Test time stamping and synchronization of audio and video.
+
+ A high latency is used so we can hear the difference in time.
+ Random durations are used so we know we are hearing the right beep
+ and not the one before or after.
+
+ Sequence of events:
+ -# Foreground requests a beep.
+ -# Background randomly schedules a beep.
+ -# Foreground waits for the beep to be heard based on PaUtil_GetTime().
+ -# Foreground outputs video (printf) in sync with audio.
+ -# Repeat.
+
+ @author Phil Burk http://www.softsynth.com
+*/
+/*
+ * $Id$
+ *
+ * This program uses the PortAudio Portable Audio Library.
+ * For more information see: http://www.portaudio.com
+ * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * The text above constitutes the entire PortAudio license; however,
+ * the PortAudio community also makes the following non-binding requests:
+ *
+ * Any person wishing to distribute modifications to the Software is
+ * requested to send the modifications to the original developer so that
+ * they can be incorporated into the canonical version. It is also
+ * requested that these non-binding requests be included along with the
+ * license above.
+ */
+
+#include <stdio.h>
+#include <math.h>
+#include "portaudio.h"
+#include "pa_util.h"
+#define NUM_BEEPS (6)
+#define SAMPLE_RATE (44100)
+#define SAMPLE_PERIOD (1.0/44100.0)
+#define FRAMES_PER_BUFFER (256)
+#define BEEP_DURATION (400)
+#define LATENCY_MSEC (2000)
+#define SLEEP_MSEC (10)
+#define TIMEOUT_MSEC (15000)
+
+#define STATE_BKG_IDLE (0)
+#define STATE_BKG_PENDING (1)
+#define STATE_BKG_BEEPING (2)
+typedef struct
+{
+ float left_phase;
+ float right_phase;
+ int state;
+ volatile int requestBeep; /* Set by foreground, cleared by background. */
+ PaTime beepTime;
+ int beepCount;
+ double latency; /* For debugging. */
+}
+paTestData;
+
+static unsigned long GenerateRandomNumber( void );
+/************************************************************/
+/* Calculate pseudo-random 32 bit number based on linear congruential method. */
+static unsigned long GenerateRandomNumber( void )
+{
+ static unsigned long randSeed = 99887766; /* Change this for different random sequences. */
+ randSeed = (randSeed * 196314165) + 907633515;
+ return randSeed;
+}
+
+/* This routine will be called by the PortAudio engine when audio is needed.
+** It may called at interrupt level on some machines so don't do anything
+** that could mess up the system like calling malloc() or free().
+*/
+static int patestCallback( const void *inputBuffer, void *outputBuffer,
+ unsigned long framesPerBuffer,
+ const PaStreamCallbackTimeInfo *timeInfo,
+ PaStreamCallbackFlags statusFlags, void *userData )
+{
+ /* Cast data passed through stream to our structure. */
+ paTestData *data = (paTestData*)userData;
+ float *out = (float*)outputBuffer;
+ unsigned int i;
+ (void) inputBuffer;
+
+ data->latency = timeInfo->outputBufferDacTime - timeInfo->currentTime;
+
+ for( i=0; i<framesPerBuffer; i++ )
+ {
+ switch( data->state )
+ {
+ case STATE_BKG_IDLE:
+ /* Schedule beep at some random time in the future. */
+ if( data->requestBeep )
+ {
+ int random = GenerateRandomNumber() >> 14;
+ data->beepTime = timeInfo->outputBufferDacTime + (( (double)(random + SAMPLE_RATE)) * SAMPLE_PERIOD );
+ data->state = STATE_BKG_PENDING;
+ }
+ *out++ = 0.0; /* left */
+ *out++ = 0.0; /* right */
+ break;
+
+ case STATE_BKG_PENDING:
+ if( (timeInfo->outputBufferDacTime + (i*SAMPLE_PERIOD)) >= data->beepTime )
+ {
+ data->state = STATE_BKG_BEEPING;
+ data->beepCount = BEEP_DURATION;
+ data->left_phase = data->right_phase = 0.0;
+ }
+ *out++ = 0.0; /* left */
+ *out++ = 0.0; /* right */
+ break;
+
+ case STATE_BKG_BEEPING:
+ if( data->beepCount <= 0 )
+ {
+ data->state = STATE_BKG_IDLE;
+ data->requestBeep = 0;
+ *out++ = 0.0; /* left */
+ *out++ = 0.0; /* right */
+ }
+ else
+ {
+ /* Play sawtooth wave. */
+ *out++ = data->left_phase; /* left */
+ *out++ = data->right_phase; /* right */
+ /* Generate simple sawtooth phaser that ranges between -1.0 and 1.0. */
+ data->left_phase += 0.01f;
+ /* When signal reaches top, drop back down. */
+ if( data->left_phase >= 1.0f ) data->left_phase -= 2.0f;
+ /* higher pitch so we can distinguish left and right. */
+ data->right_phase += 0.03f;
+ if( data->right_phase >= 1.0f ) data->right_phase -= 2.0f;
+ }
+ data->beepCount -= 1;
+ break;
+
+ default:
+ data->state = STATE_BKG_IDLE;
+ break;
+ }
+ }
+ return 0;
+}
+/*******************************************************************/
+int main(void);
+int main(void)
+{
+ PaStream *stream;
+ PaError err;
+ paTestData DATA;
+ int i, timeout;
+ PaTime previousTime;
+ PaStreamParameters outputParameters;
+ printf("PortAudio Test: you should see BEEP at the same time you hear it.\n");
+ printf("Wait for a few seconds random delay between BEEPs.\n");
+ printf("BEEP %d times.\n", NUM_BEEPS );
+ /* Initialize our DATA for use by callback. */
+ DATA.left_phase = DATA.right_phase = 0.0;
+ DATA.state = STATE_BKG_IDLE;
+ DATA.requestBeep = 0;
+ /* Initialize library before making any other calls. */
+ err = Pa_Initialize();
+ if( err != paNoError ) goto error;
+
+ outputParameters.device = Pa_GetDefaultOutputDevice();
+ if (outputParameters.device == paNoDevice) {
+ fprintf(stderr,"Error: No default output device.\n");
+ goto error;
+ }
+ outputParameters.channelCount = 2;
+ outputParameters.hostApiSpecificStreamInfo = NULL;
+ outputParameters.sampleFormat = paFloat32;
+ outputParameters.suggestedLatency = (double)LATENCY_MSEC / 1000;
+
+ /* Open an audio I/O stream. */
+ err = Pa_OpenStream(
+ &stream,
+ NULL, /* no input */
+ &outputParameters,
+ SAMPLE_RATE,
+ FRAMES_PER_BUFFER, /* frames per buffer */
+ paClipOff, /* we won't output out of range samples so don't bother clipping them */
+ patestCallback,
+ &DATA );
+ if( err != paNoError ) goto error;
+
+ err = Pa_StartStream( stream );
+ if( err != paNoError ) goto error;
+
+ printf("started\n");
+ fflush(stdout);
+
+ previousTime = Pa_GetStreamTime( stream );
+ for( i=0; i<NUM_BEEPS; i++ )
+ {
+ /* Request a beep from background. */
+ DATA.requestBeep = 1;
+
+ /* Wait for background to acknowledge request. */
+ timeout = TIMEOUT_MSEC;
+ while( (DATA.requestBeep == 1) && (timeout-- > 0 ) ) Pa_Sleep(SLEEP_MSEC);
+ if( timeout <= 0 )
+ {
+ fprintf( stderr, "Timed out waiting for background to acknowledge request.\n" );
+ goto error;
+ }
+ printf("calc beep for %9.3f, latency = %6.3f\n", DATA.beepTime, DATA.latency );
+ fflush(stdout);
+
+ /* Wait for scheduled beep time. */
+ timeout = TIMEOUT_MSEC + (10000/SLEEP_MSEC);
+ while( (Pa_GetStreamTime( stream ) < DATA.beepTime) && (timeout-- > 0 ) )
+ {
+ Pa_Sleep(SLEEP_MSEC);
+ }
+ if( timeout <= 0 )
+ {
+ fprintf( stderr, "Timed out waiting for time. Now = %9.3f, Beep for %9.3f.\n",
+ PaUtil_GetTime(), DATA.beepTime );
+ goto error;
+ }
+
+ /* Beep should be sounding now so print synchronized BEEP. */
+ printf("hear \"BEEP\" at %9.3f, delta = %9.3f\n",
+ Pa_GetStreamTime( stream ), (DATA.beepTime - previousTime) );
+ fflush(stdout);
+
+ previousTime = DATA.beepTime;
+ }
+
+ err = Pa_StopStream( stream );
+ if( err != paNoError ) goto error;
+
+ err = Pa_CloseStream( stream );
+ if( err != paNoError ) goto error;
+
+ Pa_Terminate();
+ printf("Test finished.\n");
+ return err;
+error:
+ Pa_Terminate();
+ fprintf( stderr, "An error occurred while using the portaudio stream\n" );
+ fprintf( stderr, "Error number: %d\n", err );
+ fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
+ return err;
+}