483 lines
18 KiB
C
483 lines
18 KiB
C
/** @file paqa_latency.c
|
|
@ingroup qa_src
|
|
@brief Test latency estimates.
|
|
@author Ross Bencina <rossb@audiomulch.com>
|
|
@author Phil Burk <philburk@softsynth.com>
|
|
*/
|
|
/*
|
|
* $Id: patest_sine.c 1368 2008-03-01 00:38:27Z rossb $
|
|
*
|
|
* 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 "loopback/src/qa_tools.h"
|
|
|
|
#define NUM_SECONDS (5)
|
|
#define SAMPLE_RATE (44100)
|
|
#define FRAMES_PER_BUFFER (64)
|
|
|
|
#ifndef M_PI
|
|
#define M_PI (3.14159265)
|
|
#endif
|
|
|
|
#define TABLE_SIZE (200)
|
|
typedef struct
|
|
{
|
|
float sine[TABLE_SIZE];
|
|
int left_phase;
|
|
int right_phase;
|
|
char message[20];
|
|
int minFramesPerBuffer;
|
|
int maxFramesPerBuffer;
|
|
int callbackCount;
|
|
PaTime minDeltaDacTime;
|
|
PaTime maxDeltaDacTime;
|
|
PaStreamCallbackTimeInfo previousTimeInfo;
|
|
}
|
|
paTestData;
|
|
|
|
/* Used to tally the results of the QA tests. */
|
|
int g_testsPassed = 0;
|
|
int g_testsFailed = 0;
|
|
|
|
/* 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 )
|
|
{
|
|
paTestData *data = (paTestData*)userData;
|
|
float *out = (float*)outputBuffer;
|
|
unsigned long i;
|
|
|
|
(void) timeInfo; /* Prevent unused variable warnings. */
|
|
(void) statusFlags;
|
|
(void) inputBuffer;
|
|
|
|
if( data->minFramesPerBuffer > framesPerBuffer )
|
|
{
|
|
data->minFramesPerBuffer = framesPerBuffer;
|
|
}
|
|
if( data->maxFramesPerBuffer < framesPerBuffer )
|
|
{
|
|
data->maxFramesPerBuffer = framesPerBuffer;
|
|
}
|
|
|
|
/* Measure min and max output time stamp delta. */
|
|
if( data->callbackCount > 0 )
|
|
{
|
|
PaTime delta = timeInfo->outputBufferDacTime - data->previousTimeInfo.outputBufferDacTime;
|
|
if( data->minDeltaDacTime > delta )
|
|
{
|
|
data->minDeltaDacTime = delta;
|
|
}
|
|
if( data->maxDeltaDacTime < delta )
|
|
{
|
|
data->maxDeltaDacTime = delta;
|
|
}
|
|
}
|
|
data->previousTimeInfo = *timeInfo;
|
|
|
|
for( i=0; i<framesPerBuffer; i++ )
|
|
{
|
|
*out++ = data->sine[data->left_phase]; /* left */
|
|
*out++ = data->sine[data->right_phase]; /* right */
|
|
data->left_phase += 1;
|
|
if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE;
|
|
data->right_phase += 3; /* higher pitch so we can distinguish left and right. */
|
|
if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE;
|
|
}
|
|
|
|
data->callbackCount += 1;
|
|
return paContinue;
|
|
}
|
|
|
|
PaError paqaCheckLatency( PaStreamParameters *outputParamsPtr,
|
|
paTestData *dataPtr, double sampleRate, unsigned long framesPerBuffer )
|
|
{
|
|
PaError err;
|
|
PaStream *stream;
|
|
const PaStreamInfo* streamInfo;
|
|
|
|
dataPtr->minFramesPerBuffer = 9999999;
|
|
dataPtr->maxFramesPerBuffer = 0;
|
|
dataPtr->minDeltaDacTime = 9999999.0;
|
|
dataPtr->maxDeltaDacTime = 0.0;
|
|
dataPtr->callbackCount = 0;
|
|
|
|
printf("Stream parameter: suggestedOutputLatency = %g\n", outputParamsPtr->suggestedLatency );
|
|
if( framesPerBuffer == paFramesPerBufferUnspecified ){
|
|
printf("Stream parameter: user framesPerBuffer = paFramesPerBufferUnspecified\n" );
|
|
}else{
|
|
printf("Stream parameter: user framesPerBuffer = %lu\n", framesPerBuffer );
|
|
}
|
|
err = Pa_OpenStream(
|
|
&stream,
|
|
NULL, /* no input */
|
|
outputParamsPtr,
|
|
sampleRate,
|
|
framesPerBuffer,
|
|
paClipOff, /* we won't output out of range samples so don't bother clipping them */
|
|
patestCallback,
|
|
dataPtr );
|
|
if( err != paNoError ) goto error1;
|
|
|
|
streamInfo = Pa_GetStreamInfo( stream );
|
|
printf("Stream info: inputLatency = %g\n", streamInfo->inputLatency );
|
|
printf("Stream info: outputLatency = %g\n", streamInfo->outputLatency );
|
|
|
|
err = Pa_StartStream( stream );
|
|
if( err != paNoError ) goto error2;
|
|
|
|
printf("Play for %d seconds.\n", NUM_SECONDS );
|
|
Pa_Sleep( NUM_SECONDS * 1000 );
|
|
|
|
printf(" minFramesPerBuffer = %4d\n", dataPtr->minFramesPerBuffer );
|
|
printf(" maxFramesPerBuffer = %4d\n", dataPtr->maxFramesPerBuffer );
|
|
printf(" minDeltaDacTime = %f\n", dataPtr->minDeltaDacTime );
|
|
printf(" maxDeltaDacTime = %f\n", dataPtr->maxDeltaDacTime );
|
|
|
|
err = Pa_StopStream( stream );
|
|
if( err != paNoError ) goto error2;
|
|
|
|
err = Pa_CloseStream( stream );
|
|
Pa_Sleep( 1 * 1000 );
|
|
|
|
|
|
printf("-------------------------------------\n");
|
|
return err;
|
|
error2:
|
|
Pa_CloseStream( stream );
|
|
error1:
|
|
printf("-------------------------------------\n");
|
|
return err;
|
|
}
|
|
|
|
|
|
/*******************************************************************/
|
|
static int paqaNoopCallback( const void *inputBuffer, void *outputBuffer,
|
|
unsigned long framesPerBuffer,
|
|
const PaStreamCallbackTimeInfo* timeInfo,
|
|
PaStreamCallbackFlags statusFlags,
|
|
void *userData )
|
|
{
|
|
(void)inputBuffer;
|
|
(void)outputBuffer;
|
|
(void)framesPerBuffer;
|
|
(void)timeInfo;
|
|
(void)statusFlags;
|
|
(void)userData;
|
|
return paContinue;
|
|
}
|
|
|
|
/*******************************************************************/
|
|
static int paqaCheckMultipleSuggested( PaDeviceIndex deviceIndex, int isInput )
|
|
{
|
|
int i;
|
|
int numLoops = 10;
|
|
PaError err;
|
|
PaStream *stream;
|
|
PaStreamParameters streamParameters;
|
|
const PaStreamInfo* streamInfo;
|
|
double lowLatency;
|
|
double highLatency;
|
|
double finalLatency;
|
|
double sampleRate = SAMPLE_RATE;
|
|
const PaDeviceInfo *pdi = Pa_GetDeviceInfo( deviceIndex );
|
|
double previousLatency = 0.0;
|
|
int numChannels = 1;
|
|
float toleranceRatio = 1.0;
|
|
|
|
printf("------------------------ paqaCheckMultipleSuggested - %s\n",
|
|
(isInput ? "INPUT" : "OUTPUT") );
|
|
if( isInput )
|
|
{
|
|
lowLatency = pdi->defaultLowInputLatency;
|
|
highLatency = pdi->defaultHighInputLatency;
|
|
numChannels = (pdi->maxInputChannels < 2) ? 1 : 2;
|
|
}
|
|
else
|
|
{
|
|
lowLatency = pdi->defaultLowOutputLatency;
|
|
highLatency = pdi->defaultHighOutputLatency;
|
|
numChannels = (pdi->maxOutputChannels < 2) ? 1 : 2;
|
|
}
|
|
streamParameters.channelCount = numChannels;
|
|
streamParameters.device = deviceIndex;
|
|
streamParameters.hostApiSpecificStreamInfo = NULL;
|
|
streamParameters.sampleFormat = paFloat32;
|
|
sampleRate = pdi->defaultSampleRate;
|
|
|
|
printf(" lowLatency = %g\n", lowLatency );
|
|
printf(" highLatency = %g\n", highLatency );
|
|
printf(" numChannels = %d\n", numChannels );
|
|
printf(" sampleRate = %g\n", sampleRate );
|
|
|
|
if( (highLatency - lowLatency) < 0.001 )
|
|
{
|
|
numLoops = 1;
|
|
}
|
|
|
|
for( i=0; i<numLoops; i++ )
|
|
{
|
|
if( numLoops == 1 )
|
|
streamParameters.suggestedLatency = lowLatency;
|
|
else
|
|
streamParameters.suggestedLatency = lowLatency + ((highLatency - lowLatency) * i /(numLoops - 1));
|
|
|
|
printf(" suggestedLatency[%d] = %6.4f\n", i, streamParameters.suggestedLatency );
|
|
|
|
err = Pa_OpenStream(
|
|
&stream,
|
|
(isInput ? &streamParameters : NULL),
|
|
(isInput ? NULL : &streamParameters),
|
|
sampleRate,
|
|
paFramesPerBufferUnspecified,
|
|
paClipOff, /* we won't output out of range samples so don't bother clipping them */
|
|
paqaNoopCallback,
|
|
NULL );
|
|
if( err != paNoError ) goto error;
|
|
|
|
streamInfo = Pa_GetStreamInfo( stream );
|
|
|
|
err = Pa_CloseStream( stream );
|
|
|
|
if( isInput )
|
|
{
|
|
finalLatency = streamInfo->inputLatency;
|
|
}
|
|
else
|
|
{
|
|
finalLatency = streamInfo->outputLatency;
|
|
}
|
|
printf(" finalLatency = %6.4f\n", finalLatency );
|
|
/* For the default low & high latency values, expect quite close; for other requested
|
|
* values, at worst the next power-of-2 may result (eg 513 -> 1024) */
|
|
toleranceRatio = ( (i == 0) || (i == ( numLoops - 1 )) ) ? 0.1 : 1.0;
|
|
QA_ASSERT_CLOSE( "final latency should be close to suggested latency",
|
|
streamParameters.suggestedLatency, finalLatency, (streamParameters.suggestedLatency * toleranceRatio) );
|
|
if( i == 0 )
|
|
{
|
|
previousLatency = finalLatency;
|
|
}
|
|
}
|
|
|
|
if( numLoops > 1 )
|
|
{
|
|
QA_ASSERT_TRUE( " final latency should increase with suggested latency", (finalLatency > previousLatency) );
|
|
}
|
|
|
|
return 0;
|
|
error:
|
|
return -1;
|
|
}
|
|
|
|
/*******************************************************************/
|
|
static int paqaVerifySuggestedLatency( void )
|
|
{
|
|
PaDeviceIndex id;
|
|
int result = 0;
|
|
const PaDeviceInfo *pdi;
|
|
int numDevices = Pa_GetDeviceCount();
|
|
|
|
printf("\n ------------------------ paqaVerifySuggestedLatency\n");
|
|
for( id=0; id<numDevices; id++ ) /* Iterate through all devices. */
|
|
{
|
|
pdi = Pa_GetDeviceInfo( id );
|
|
printf("\nUsing device #%d: '%s' (%s)\n", id, pdi->name, Pa_GetHostApiInfo(pdi->hostApi)->name);
|
|
if( pdi->maxOutputChannels > 0 )
|
|
{
|
|
if( paqaCheckMultipleSuggested( id, 0 ) < 0 )
|
|
{
|
|
printf("OUTPUT CHECK FAILED !!! #%d: '%s'\n", id, pdi->name);
|
|
result -= 1;
|
|
}
|
|
}
|
|
if( pdi->maxInputChannels > 0 )
|
|
{
|
|
if( paqaCheckMultipleSuggested( id, 1 ) < 0 )
|
|
{
|
|
printf("INPUT CHECK FAILED !!! #%d: '%s'\n", id, pdi->name);
|
|
result -= 1;
|
|
}
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*******************************************************************/
|
|
static int paqaVerifyDeviceInfoLatency( void )
|
|
{
|
|
PaDeviceIndex id;
|
|
const PaDeviceInfo *pdi;
|
|
int numDevices = Pa_GetDeviceCount();
|
|
|
|
printf("\n ------------------------ paqaVerifyDeviceInfoLatency\n");
|
|
for( id=0; id<numDevices; id++ ) /* Iterate through all devices. */
|
|
{
|
|
pdi = Pa_GetDeviceInfo( id );
|
|
printf("Using device #%d: '%s' (%s)\n", id, pdi->name, Pa_GetHostApiInfo(pdi->hostApi)->name);
|
|
if( pdi->maxOutputChannels > 0 )
|
|
{
|
|
printf(" Output defaultLowOutputLatency = %f seconds\n", pdi->defaultLowOutputLatency);
|
|
printf(" Output defaultHighOutputLatency = %f seconds\n", pdi->defaultHighOutputLatency);
|
|
QA_ASSERT_TRUE( "defaultLowOutputLatency should be > 0", (pdi->defaultLowOutputLatency > 0.0) );
|
|
QA_ASSERT_TRUE( "defaultHighOutputLatency should be > 0", (pdi->defaultHighOutputLatency > 0.0) );
|
|
QA_ASSERT_TRUE( "defaultHighOutputLatency should be >= Low", (pdi->defaultHighOutputLatency >= pdi->defaultLowOutputLatency) );
|
|
}
|
|
if( pdi->maxInputChannels > 0 )
|
|
{
|
|
printf(" Input defaultLowInputLatency = %f seconds\n", pdi->defaultLowInputLatency);
|
|
printf(" Input defaultHighInputLatency = %f seconds\n", pdi->defaultHighInputLatency);
|
|
QA_ASSERT_TRUE( "defaultLowInputLatency should be > 0", (pdi->defaultLowInputLatency > 0.0) );
|
|
QA_ASSERT_TRUE( "defaultHighInputLatency should be > 0", (pdi->defaultHighInputLatency > 0.0) );
|
|
QA_ASSERT_TRUE( "defaultHighInputLatency should be >= Low", (pdi->defaultHighInputLatency >= pdi->defaultLowInputLatency) );
|
|
}
|
|
}
|
|
return 0;
|
|
error:
|
|
return -1;
|
|
}
|
|
|
|
|
|
|
|
/*******************************************************************/
|
|
int main(void);
|
|
int main(void)
|
|
{
|
|
PaStreamParameters outputParameters;
|
|
PaError err;
|
|
paTestData data;
|
|
const PaDeviceInfo *deviceInfo;
|
|
int i;
|
|
int framesPerBuffer;
|
|
double sampleRate = SAMPLE_RATE;
|
|
|
|
printf("\nPortAudio QA: investigate output latency.\n");
|
|
|
|
/* initialise sinusoidal wavetable */
|
|
for( i=0; i<TABLE_SIZE; i++ )
|
|
{
|
|
data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
|
|
}
|
|
data.left_phase = data.right_phase = 0;
|
|
|
|
err = Pa_Initialize();
|
|
if( err != paNoError ) goto error;
|
|
|
|
/* Run self tests. */
|
|
if( paqaVerifyDeviceInfoLatency() < 0 ) goto error;
|
|
|
|
if( paqaVerifySuggestedLatency() < 0 ) goto error;
|
|
|
|
outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
|
|
if (outputParameters.device == paNoDevice) {
|
|
fprintf(stderr,"Error: No default output device.\n");
|
|
goto error;
|
|
}
|
|
|
|
printf("\n\nNow running Audio Output Tests...\n");
|
|
printf("-------------------------------------\n");
|
|
|
|
outputParameters.channelCount = 2; /* stereo output */
|
|
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
|
|
deviceInfo = Pa_GetDeviceInfo( outputParameters.device );
|
|
printf("Using device #%d: '%s' (%s)\n", outputParameters.device, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name);
|
|
printf("Device info: defaultLowOutputLatency = %f seconds\n", deviceInfo->defaultLowOutputLatency);
|
|
printf("Device info: defaultHighOutputLatency = %f seconds\n", deviceInfo->defaultHighOutputLatency);
|
|
sampleRate = deviceInfo->defaultSampleRate;
|
|
printf("Sample Rate for following tests: %g\n", sampleRate);
|
|
outputParameters.hostApiSpecificStreamInfo = NULL;
|
|
printf("-------------------------------------\n");
|
|
|
|
// Try to use a small buffer that is smaller than we think the device can handle.
|
|
// Try to force combining multiple user buffers into a host buffer.
|
|
printf("------------- Try a very small buffer.\n");
|
|
framesPerBuffer = 9;
|
|
outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency;
|
|
err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer );
|
|
if( err != paNoError ) goto error;
|
|
|
|
printf("------------- 64 frame buffer with 1.1 * defaultLow latency.\n");
|
|
framesPerBuffer = 64;
|
|
outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency * 1.1;
|
|
err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer );
|
|
if( err != paNoError ) goto error;
|
|
|
|
// Try to create a huge buffer that is bigger than the allowed device maximum.
|
|
printf("------------- Try a huge buffer.\n");
|
|
framesPerBuffer = 16*1024;
|
|
outputParameters.suggestedLatency = ((double)framesPerBuffer) / sampleRate; // approximate
|
|
err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer );
|
|
if( err != paNoError ) goto error;
|
|
|
|
printf("------------- Try suggestedLatency = 0.0\n");
|
|
outputParameters.suggestedLatency = 0.0;
|
|
err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
|
|
if( err != paNoError ) goto error;
|
|
|
|
printf("------------- Try suggestedLatency = defaultLowOutputLatency\n");
|
|
outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency;
|
|
err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
|
|
if( err != paNoError ) goto error;
|
|
|
|
printf("------------- Try suggestedLatency = defaultHighOutputLatency\n");
|
|
outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency;
|
|
err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
|
|
if( err != paNoError ) goto error;
|
|
|
|
printf("------------- Try suggestedLatency = defaultHighOutputLatency * 4\n");
|
|
outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency * 4;
|
|
err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
|
|
if( err != paNoError ) goto error;
|
|
|
|
Pa_Terminate();
|
|
printf("SUCCESS - test finished.\n");
|
|
return err;
|
|
|
|
error:
|
|
Pa_Terminate();
|
|
fprintf( stderr, "ERROR - test failed.\n" );
|
|
fprintf( stderr, "Error number: %d\n", err );
|
|
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
|
|
return err;
|
|
}
|