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Updated patest_suggested_vs_streaminfo_latency test. Python script now creates plots for a number of different buffer sizes. Supports testing at different sample rates.

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This commit is contained in:
rossb 2011-08-11 12:18:02 +00:00
commit 17882c465f
2 changed files with 95 additions and 56 deletions
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58
test/patest_suggested_vs_streaminfo_latency.c
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@ -2,6 +2,12 @@
@ingroup test_src
@brief Print suggested vs. PaStreamInfo reported actual latency
@author Ross Bencina <rossb@audiomulch.com>
Opens streams with a sequence of suggested latency values
from 0 to 2 seconds in .5ms intervals and gathers the resulting actual
latency values. Output a csv file and graph suggested vs. actual. Run
with framesPerBuffer unspecified, powers of 2 and multiples of 50 and
prime number buffer sizes.
*/
/*
* $Id: patest_sine.c 1368 2008-03-01 00:38:27Z rossb $
@ -44,18 +50,16 @@
#include <math.h>
#include "portaudio.h"
#define NUM_SECONDS (5)
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (64)
#define NUM_CHANNELS (2)
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (128)
#define NUM_CHANNELS (2)
#define SUGGESTED_LATENCY_START_SECONDS (0.0)
#define SUGGESTED_LATENCY_END_SECONDS (.5)
#define SUGGESTED_LATENCY_INCREMENT_SECONDS (0.0005) // half a millisecond increments
#define SUGGESTED_LATENCY_END_SECONDS (2.0)
#define SUGGESTED_LATENCY_INCREMENT_SECONDS (0.0005) /* half a millisecond increments */
// dummy callback. does nothing
/* dummy callback. does nothing. never gets called */
static int patestCallback( const void *inputBuffer, void *outputBuffer,
unsigned long framesPerBuffer,
const PaStreamCallbackTimeInfo* timeInfo,
@ -64,27 +68,6 @@ static int patestCallback( const void *inputBuffer, void *outputBuffer,
{
}
/*
TODO:
A test that opens streams with a sequence of suggested latency values
from 0 to 2 seconds in .5ms intervals and gathers the resulting actual
latency values. Output a csv file and graph suggested vs. actual. Run
with framesPerBuffer unspecified, powers of 2 and multiples of 50 and
prime number buffer sizes.
o- add command line parameters to specify frames per buffer, sample rate, devices
o- test at standard sample rates
*/
/*******************************************************************/
static void usage()
{
@ -93,7 +76,7 @@ static void usage()
const char *channelString;
fprintf( stderr, "PortAudio suggested (requested) vs. resulting (reported) stream latency test\n" );
fprintf( stderr, "Usage: x.exe input-device-index output-device-index frames-per-buffer\n" );
fprintf( stderr, "Usage: x.exe input-device-index output-device-index sample-rate frames-per-buffer\n" );
fprintf( stderr, "Use -1 for default device index, or use one of these:\n" );
for( i=0; i < Pa_GetDeviceCount(); ++i ){
deviceInfo = Pa_GetDeviceInfo(i);
@ -121,6 +104,7 @@ int main( int argc, const char* argv[] )
PaStreamInfo *streamInfo;
PaDeviceInfo *deviceInfo;
int deviceCount;
float sampleRate = SAMPLE_RATE;
int framesPerBuffer = FRAMES_PER_BUFFER;
err = Pa_Initialize();
if( err != paNoError ) goto error;
@ -129,10 +113,14 @@ int main( int argc, const char* argv[] )
usage();
if( argc > 3 ){
framesPerBuffer = atoi(argv[3]);
sampleRate = atoi(argv[3]);
}
printf("# sample rate=%f, frames per buffer=%d\n", (float)SAMPLE_RATE, framesPerBuffer );
if( argc > 4 ){
framesPerBuffer = atoi(argv[4]);
}
printf("# sample rate=%f, frames per buffer=%d\n", (float)sampleRate, framesPerBuffer );
outputParameters.device = -1;
if( argc > 1 )
@ -208,7 +196,7 @@ int main( int argc, const char* argv[] )
&stream,
NULL, /* no input */
&outputParameters,
SAMPLE_RATE,
sampleRate,
framesPerBuffer,
paClipOff, /* we won't output out of range samples so don't bother clipping them */
patestCallback,
@ -228,7 +216,7 @@ int main( int argc, const char* argv[] )
&stream,
&inputParameters,
NULL, /* no output */
SAMPLE_RATE,
sampleRate,
framesPerBuffer,
paClipOff, /* we won't output out of range samples so don't bother clipping them */
patestCallback,
@ -248,7 +236,7 @@ int main( int argc, const char* argv[] )
&stream,
&inputParameters,
&outputParameters,
SAMPLE_RATE,
sampleRate,
framesPerBuffer,
paClipOff, /* we won't output out of range samples so don't bother clipping them */
patestCallback,