added patest_suggested_vs_streaminfo_latency test and python graphing script
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test/patest_suggested_vs_streaminfo_latency.c
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test/patest_suggested_vs_streaminfo_latency.c
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/** @file patest_suggested_vs_streaminfo_latency.c
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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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*/
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/*
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* $Id: patest_sine.c 1368 2008-03-01 00:38:27Z rossb $
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*
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* This program uses the PortAudio Portable Audio Library.
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* For more information see: http://www.portaudio.com/
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* Copyright (c) 1999-2000 Ross Bencina and Phil Burk
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* The text above constitutes the entire PortAudio license; however,
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* the PortAudio community also makes the following non-binding requests:
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version. It is also
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* requested that these non-binding requests be included along with the
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* license above.
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*/
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#include <stdio.h>
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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 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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// dummy callback. does nothing
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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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PaStreamCallbackFlags statusFlags,
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void *userData )
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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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int main(void);
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int main(void)
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{
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PaStreamParameters outputParameters, inputParameters;
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PaStream *stream;
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PaError err;
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int i;
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PaTime suggestedLatency;
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PaStreamInfo *streamInfo;
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PaDeviceInfo *deviceInfo;
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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printf("# sample rate=%f, frames per buffer=%d\n", (float)SAMPLE_RATE, FRAMES_PER_BUFFER );
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outputParameters.device = Pa_GetDefaultOutputDevice();
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if (outputParameters.device == paNoDevice) {
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fprintf(stderr,"Error: No default output device.\n");
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goto error;
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}
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outputParameters.channelCount = NUM_CHANNELS;
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outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
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outputParameters.hostApiSpecificStreamInfo = NULL;
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deviceInfo = Pa_GetDeviceInfo(outputParameters.device);
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printf( "# using output device id %d (%s, %s)\n", outputParameters.device, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name );
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inputParameters.device = Pa_GetDefaultInputDevice();
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if (inputParameters.device == paNoDevice) {
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fprintf(stderr,"Error: No default input device.\n");
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goto error;
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}
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inputParameters.channelCount = NUM_CHANNELS;
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inputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
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inputParameters.hostApiSpecificStreamInfo = NULL;
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deviceInfo = Pa_GetDeviceInfo(inputParameters.device);
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printf( "# using input device id %d (%s, %s)\n", inputParameters.device, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name );
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printf( "# suggested latency, half duplex PaStreamInfo::outputLatency, half duplex PaStreamInfo::inputLatency, half duplex PaStreamInfo::outputLatency, half duplex PaStreamInfo::inputLatency\n" );
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suggestedLatency = SUGGESTED_LATENCY_START_SECONDS;
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while( suggestedLatency <= SUGGESTED_LATENCY_END_SECONDS ){
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outputParameters.suggestedLatency = suggestedLatency;
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inputParameters.suggestedLatency = suggestedLatency;
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printf( "%f, ", suggestedLatency );
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/* ------------------------------ output ------------------------------ */
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err = Pa_OpenStream(
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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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FRAMES_PER_BUFFER,
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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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0 );
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if( err != paNoError ) goto error;
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streamInfo = Pa_GetStreamInfo( stream );
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printf( "%f,", streamInfo->outputLatency );
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err = Pa_CloseStream( stream );
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if( err != paNoError ) goto error;
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/* ------------------------------ input ------------------------------ */
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err = Pa_OpenStream(
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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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FRAMES_PER_BUFFER,
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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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0 );
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if( err != paNoError ) goto error;
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streamInfo = Pa_GetStreamInfo( stream );
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printf( "%f,", streamInfo->inputLatency );
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err = Pa_CloseStream( stream );
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if( err != paNoError ) goto error;
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/* ------------------------------ full duplex ------------------------------ */
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err = Pa_OpenStream(
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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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FRAMES_PER_BUFFER,
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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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0 );
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if( err != paNoError ) goto error;
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streamInfo = Pa_GetStreamInfo( stream );
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printf( "%f,%f", streamInfo->outputLatency, streamInfo->inputLatency );
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err = Pa_CloseStream( stream );
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if( err != paNoError ) goto error;
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/* ------------------------------------------------------------ */
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printf( "\n" );
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suggestedLatency += SUGGESTED_LATENCY_INCREMENT_SECONDS;
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}
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Pa_Terminate();
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printf("# Test finished.\n");
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return err;
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error:
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Pa_Terminate();
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fprintf( stderr, "An error occured while using the portaudio stream\n" );
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fprintf( stderr, "Error number: %d\n", err );
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fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
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return err;
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}
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58
test/patest_suggested_vs_streaminfo_latency.py
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58
test/patest_suggested_vs_streaminfo_latency.py
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#!/usr/bin/env python
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"""
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Run and graph the results of patest_suggested_vs_streaminfo_latency.c
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Requires matplotlib for plotting: http://matplotlib.sourceforge.net/
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"""
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import os
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from pylab import *
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import numpy
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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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def loadCsvData( dataFileName ):
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params= ""
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inputDevice = ""
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outputDevice = ""
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startLines = file(dataFileName).readlines(1024)
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for line in startLines:
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if "output device" in line:
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outputDevice = line.strip(" \t\n\r#")
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if "input device" in line:
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inputDevice = line.strip(" \t\n\r#")
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params = startLines[0].strip(" \t\n\r#")
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data = numpy.loadtxt(dataFileName, delimiter=",", skiprows=4).transpose()
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class R(object): pass
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result = R()
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result.titleInfo = '%s\n%s\n%s'%(params,inputDevice,outputDevice)
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result.suggestedLatency = data[0]
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result.halfDuplexOutputLatency = data[1]
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result.halfDuplexInputLatency = data[2]
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result.fullDuplexOutputLatency = data[3]
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result.fullDuplexInputLatency = data[4]
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return result;
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os.system(testExeName + ' > ' + dataFileName)
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d = loadCsvData(dataFileName)
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plot( d.suggestedLatency, d.suggestedLatency )
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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'%d.titleInfo)
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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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show()
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