me/portaudio
Watch
1
0
Fork
You've already forked portaudio
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

Draft version for debugging latency and timing.

Browse source
This commit is contained in:
philburk 2011-07-28 04:59:17 +00:00
commit 062e8a7a86
1 changed files with 234 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

234
qa/paqa_latency.c Normal file
View file

@ -0,0 +1,234 @@
/** @file patest_sine.c
@ingroup test_src
@brief Play a sine wave for several seconds.
@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"
#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;
}
paTestData;
/* 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;
}
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;
}
return paContinue;
}
PaError paqaCheckLatency( PaStreamParameters *outputParamsPtr,
paTestData *dataPtr, double sampleRate, unsigned long framesPerBuffer )
{
PaError err;
PaStream *stream;
dataPtr->minFramesPerBuffer = 9999999;
dataPtr->maxFramesPerBuffer = 0;
printf("-------------------------------------\n");
printf("Stream suggestedOutputLatency = %g\n", outputParamsPtr->suggestedLatency );
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;
err = Pa_StartStream( stream );
if( err != paNoError ) goto error2;
printf("Play for %d seconds.\n", NUM_SECONDS );
Pa_Sleep( NUM_SECONDS * 1000 );
const PaStreamInfo* streamInfo = Pa_GetStreamInfo( stream );
printf("Stream inputLatency = %g\n", streamInfo->inputLatency );
printf("Stream outputLatency = %g\n", streamInfo->outputLatency );
printf(" minFramesPerBuffer = %4d\n", dataPtr->minFramesPerBuffer );
printf(" maxFramesPerBuffer = %4d\n", dataPtr->maxFramesPerBuffer );
err = Pa_StopStream( stream );
if( err != paNoError ) goto error2;
err = Pa_CloseStream( stream );
Pa_Sleep( 1 * 1000 );
return err;
error2:
Pa_CloseStream( stream );
error1:
return err;
}
/*******************************************************************/
int main(void);
int main(void)
{
PaStreamParameters outputParameters;
PaError err;
paTestData data;
const PaDeviceInfo *deviceInfo;
int i;
int framesPerBuffer;
double sampleRate = 44100;
printf("PortAudio QA: investigate output latency. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
/* 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;
outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
if (outputParameters.device == paNoDevice) {
fprintf(stderr,"Error: No default output device.\n");
goto error;
}
outputParameters.channelCount = 2; /* stereo output */
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
deviceInfo = Pa_GetDeviceInfo( outputParameters.device );
printf("defaultLowOutputLatency = %f seconds\n", deviceInfo->defaultLowOutputLatency);
printf("defaultHighOutputLatency = %f seconds\n", deviceInfo->defaultHighOutputLatency);
outputParameters.hostApiSpecificStreamInfo = NULL;
// 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.
framesPerBuffer = 8;
outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency;
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.
framesPerBuffer = 16*1024;
outputParameters.suggestedLatency = ((double)framesPerBuffer) / sampleRate; // approximate
err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer );
if( err != paNoError ) goto error;
outputParameters.suggestedLatency = 0.0;
err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
if( err != paNoError ) goto error;
outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency;
err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
if( err != paNoError ) goto error;
outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency;
err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
if( err != paNoError ) goto error;
outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency * 4;
err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified );
if( err != paNoError ) goto error;
Pa_Terminate();
printf("Test finished.\n");
return err;
error:
Pa_Terminate();
fprintf( stderr, "An error occured while using the portaudio stream\n" );
fprintf( stderr, "Error number: %d\n", err );
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
return err;
}