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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rossb
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2 changed files with 95 additions and 56 deletions
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@ -2,6 +2,12 @@
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@ingroup test_src
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@brief Print suggested vs. PaStreamInfo reported actual latency
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@author Ross Bencina <rossb@audiomulch.com>
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Opens streams with a sequence of suggested latency values
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from 0 to 2 seconds in .5ms intervals and gathers the resulting actual
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latency values. Output a csv file and graph suggested vs. actual. Run
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with framesPerBuffer unspecified, powers of 2 and multiples of 50 and
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prime number buffer sizes.
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*/
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/*
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* $Id: patest_sine.c 1368 2008-03-01 00:38:27Z rossb $
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@ -44,18 +50,16 @@
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#include <math.h>
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#include "portaudio.h"
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#define NUM_SECONDS (5)
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (64)
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#define NUM_CHANNELS (2)
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (128)
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#define NUM_CHANNELS (2)
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#define SUGGESTED_LATENCY_START_SECONDS (0.0)
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#define SUGGESTED_LATENCY_END_SECONDS (.5)
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#define SUGGESTED_LATENCY_INCREMENT_SECONDS (0.0005) // half a millisecond increments
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#define SUGGESTED_LATENCY_END_SECONDS (2.0)
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#define SUGGESTED_LATENCY_INCREMENT_SECONDS (0.0005) /* half a millisecond increments */
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// dummy callback. does nothing
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/* dummy callback. does nothing. never gets called */
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static int patestCallback( const void *inputBuffer, void *outputBuffer,
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unsigned long framesPerBuffer,
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const PaStreamCallbackTimeInfo* timeInfo,
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@ -64,27 +68,6 @@ static int patestCallback( const void *inputBuffer, void *outputBuffer,
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{
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}
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/*
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TODO:
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A test that opens streams with a sequence of suggested latency values
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from 0 to 2 seconds in .5ms intervals and gathers the resulting actual
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latency values. Output a csv file and graph suggested vs. actual. Run
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with framesPerBuffer unspecified, powers of 2 and multiples of 50 and
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prime number buffer sizes.
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o- add command line parameters to specify frames per buffer, sample rate, devices
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o- test at standard sample rates
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*/
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/*******************************************************************/
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static void usage()
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{
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@ -93,7 +76,7 @@ static void usage()
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const char *channelString;
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fprintf( stderr, "PortAudio suggested (requested) vs. resulting (reported) stream latency test\n" );
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fprintf( stderr, "Usage: x.exe input-device-index output-device-index frames-per-buffer\n" );
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fprintf( stderr, "Usage: x.exe input-device-index output-device-index sample-rate frames-per-buffer\n" );
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fprintf( stderr, "Use -1 for default device index, or use one of these:\n" );
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for( i=0; i < Pa_GetDeviceCount(); ++i ){
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deviceInfo = Pa_GetDeviceInfo(i);
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@ -121,6 +104,7 @@ int main( int argc, const char* argv[] )
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PaStreamInfo *streamInfo;
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PaDeviceInfo *deviceInfo;
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int deviceCount;
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float sampleRate = SAMPLE_RATE;
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int framesPerBuffer = FRAMES_PER_BUFFER;
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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@ -129,10 +113,14 @@ int main( int argc, const char* argv[] )
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usage();
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if( argc > 3 ){
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framesPerBuffer = atoi(argv[3]);
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sampleRate = atoi(argv[3]);
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}
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printf("# sample rate=%f, frames per buffer=%d\n", (float)SAMPLE_RATE, framesPerBuffer );
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if( argc > 4 ){
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framesPerBuffer = atoi(argv[4]);
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}
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printf("# sample rate=%f, frames per buffer=%d\n", (float)sampleRate, framesPerBuffer );
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outputParameters.device = -1;
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if( argc > 1 )
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@ -208,7 +196,7 @@ int main( int argc, const char* argv[] )
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&stream,
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NULL, /* no input */
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&outputParameters,
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SAMPLE_RATE,
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sampleRate,
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framesPerBuffer,
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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patestCallback,
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@ -228,7 +216,7 @@ int main( int argc, const char* argv[] )
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&stream,
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&inputParameters,
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NULL, /* no output */
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SAMPLE_RATE,
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sampleRate,
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framesPerBuffer,
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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patestCallback,
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@ -248,7 +236,7 @@ int main( int argc, const char* argv[] )
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&stream,
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&inputParameters,
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&outputParameters,
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SAMPLE_RATE,
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sampleRate,
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framesPerBuffer,
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paClipOff, /* we won't output out of range samples so don't bother clipping them */
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patestCallback,
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@ -10,13 +10,16 @@ import os
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from pylab import *
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import numpy
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from matplotlib.backends.backend_pdf import PdfPages
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pdfFile = PdfPages('patest_suggested_vs_streaminfo_latency.pdf')
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testExeName = "PATest.exe" # rename to whatever the compiled patest_suggested_vs_streaminfo_latency.c binary is
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dataFileName = 'patest_suggested_vs_streaminfo_latency.csv' # code below calls the exe to generate this file
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dataFileName = "patest_suggested_vs_streaminfo_latency.csv" # code below calls the exe to generate this file
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inputDeviceIndex = -1 # -1 means default
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inputDeviceIndex = -1 # -1 means default
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outputDeviceIndex = -1 # -1 means default
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sampleRate = 44100
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pdfFilenameSuffix = "_wmme"
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pdfFile = PdfPages("patest_suggested_vs_streaminfo_latency_" + str(sampleRate) + pdfFilenameSuffix +".pdf") #output this pdf file
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def loadCsvData( dataFileName ):
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@ -50,45 +53,93 @@ def loadCsvData( dataFileName ):
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result.fullDuplexInputLatency = data[4]
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return result;
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def setFigureTitleAndAxisLabels( framesPerBufferString ):
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title("PortAudio suggested (requested) vs. resulting (reported) stream latency\n" + framesPerBufferString)
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ylabel("PaStreamInfo::{input,output}Latency (s)")
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xlabel("Pa_OpenStream suggestedLatency (s)")
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grid(True)
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legend(loc="upper left")
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def setDisplayRangeSeconds( maxSeconds ):
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xlim(0, maxSeconds)
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ylim(0, maxSeconds)
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# run the test with different frames per buffer values:
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framesPerBufferValues = [0]
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compositeTestFramesPerBufferValues = [0]
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# powers of two
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#for i in range (1,11):
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# framesPerBufferValues.append( 2 ^ i )
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for i in range (1,11):
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compositeTestFramesPerBufferValues.append( pow(2,i) )
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# could also test: multiples of 10, random numbers, powers of primes, etc
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# multiples of 50
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for i in range (1,20):
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compositeTestFramesPerBufferValues.append( i * 50 )
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# 10ms buffer sizes
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compositeTestFramesPerBufferValues.append( 441 )
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compositeTestFramesPerBufferValues.append( 882 )
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individualPlotFramesPerBufferValues = [0,64,128,256,512] #output separate plots for these
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isFirst = True
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for framesPerBuffer in framesPerBufferValues:
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os.system(testExeName + " -1 -1 " + str(framesPerBuffer) + ' > ' + dataFileName)
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for framesPerBuffer in compositeTestFramesPerBufferValues:
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commandString = testExeName + " " + str(inputDeviceIndex) + " " + str(outputDeviceIndex) + " " + str(sampleRate) + " " + str(framesPerBuffer) + ' > ' + dataFileName
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print commandString
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os.system(commandString)
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d = loadCsvData(dataFileName)
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if isFirst:
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figure(1)
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figure(1) # title sheet
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gcf().text(0.1, 0.0,
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'patest_suggested_vs_streaminfo_latency\n%s\n%s\n%s\n'%(d.inputDevice,d.outputDevice,d.sampleRate))
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"patest_suggested_vs_streaminfo_latency\n%s\n%s\n%s\n"%(d.inputDevice,d.outputDevice,d.sampleRate))
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pdfFile.savefig()
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isFirst = False
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figure(2)
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figure(2) # composite plot, includes all compositeTestFramesPerBufferValues
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plot( d.suggestedLatency, d.suggestedLatency )
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if isFirst:
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plot( d.suggestedLatency, d.suggestedLatency, label="Suggested latency" )
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plot( d.suggestedLatency, d.halfDuplexOutputLatency )
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plot( d.suggestedLatency, d.halfDuplexInputLatency )
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plot( d.suggestedLatency, d.fullDuplexOutputLatency )
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plot( d.suggestedLatency, d.fullDuplexInputLatency )
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title('PortAudio suggested (requested) vs. resulting (reported) stream latency\n%s'%str(framesPerBufferValues))
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ylabel('PaStreamInfo::{input,output}Latency (s)')
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xlabel('Pa_OpenStream suggestedLatency (s)')
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grid(True)
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if framesPerBuffer in individualPlotFramesPerBufferValues: # individual plots
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figure( 3 + individualPlotFramesPerBufferValues.index(framesPerBuffer) )
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plot( d.suggestedLatency, d.suggestedLatency, label="Suggested latency" )
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plot( d.suggestedLatency, d.halfDuplexOutputLatency, label="Half-duplex output latency" )
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plot( d.suggestedLatency, d.halfDuplexInputLatency, label="Half-duplex input latency" )
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plot( d.suggestedLatency, d.fullDuplexOutputLatency, label="Full-duplex output latency" )
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plot( d.suggestedLatency, d.fullDuplexInputLatency, label="Full-duplex input latency" )
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if framesPerBuffer == 0:
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framesPerBufferText = "paFramesPerBufferUnspecified"
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else:
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framesPerBufferText = str(framesPerBuffer)
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setFigureTitleAndAxisLabels( "user frames per buffer: "+str(framesPerBufferText) )
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setDisplayRangeSeconds(2.2)
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pdfFile.savefig()
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setDisplayRangeSeconds(0.1)
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setFigureTitleAndAxisLabels( "user frames per buffer: "+str(framesPerBufferText)+" (detail)" )
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pdfFile.savefig()
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isFirst = False
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figure(2)
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setFigureTitleAndAxisLabels( "composite of frames per buffer values:\n"+str(compositeTestFramesPerBufferValues) )
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setDisplayRangeSeconds(2.2)
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pdfFile.savefig()
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setDisplayRangeSeconds(0.1)
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setFigureTitleAndAxisLabels( "composite of frames per buffer values:\n"+str(compositeTestFramesPerBufferValues)+" (detail)" )
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pdfFile.savefig()
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pdfFile.close()
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show()
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#uncomment this to display interactively, otherwise we just output a pdf
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#show()
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