270 lines
9.9 KiB
C
270 lines
9.9 KiB
C
/** @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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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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*
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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 <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include "portaudio.h"
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER 2//(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 (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. 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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PaStreamCallbackFlags statusFlags,
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void *userData )
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{
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return paContinue;
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}
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/*******************************************************************/
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static void usage()
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{
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int i;
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const PaDeviceInfo *deviceInfo;
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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 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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if( deviceInfo->maxInputChannels > 0 && deviceInfo->maxOutputChannels > 0 )
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channelString = "full-duplex";
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else if( deviceInfo->maxInputChannels > 0 )
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channelString = "input only";
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else
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channelString = "output only";
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fprintf( stderr, "%d (%s, %s, %s)\n", i, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name, channelString );
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}
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Pa_Terminate();
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exit(-1);
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}
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int main( int argc, const char* argv[] );
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int main( int argc, const char* argv[] )
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{
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PaStreamParameters inputParameters, outputParameters;
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PaStream *stream;
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PaError err;
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PaTime suggestedLatency;
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const PaStreamInfo *streamInfo;
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const PaDeviceInfo *deviceInfo;
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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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if( argc > 1 && strcmp(argv[1],"-h") == 0 )
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usage();
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if( argc > 3 ){
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sampleRate = atoi(argv[3]);
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}
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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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inputParameters.device = -1;
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if( argc > 1 )
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inputParameters.device = atoi(argv[1]);
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if( inputParameters.device == -1 ){
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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 available.\n");
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goto error;
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}
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}else{
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deviceInfo = Pa_GetDeviceInfo(inputParameters.device);
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if( !deviceInfo ){
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fprintf(stderr,"Error: Invalid input device index.\n");
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usage();
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}
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if( deviceInfo->maxInputChannels == 0 ){
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fprintf(stderr,"Error: Specified input device has no input channels (an output only device?).\n");
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usage();
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}
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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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outputParameters.device = -1;
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if( argc > 2 )
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outputParameters.device = atoi(argv[2]);
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if( outputParameters.device == -1 ){
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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 available.\n");
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goto error;
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}
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}else{
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deviceInfo = Pa_GetDeviceInfo(outputParameters.device);
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if( !deviceInfo ){
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fprintf(stderr,"Error: Invalid output device index.\n");
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usage();
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}
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if( deviceInfo->maxOutputChannels == 0 ){
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fprintf(stderr,"Error: Specified output device has no output channels (an input only device?).\n");
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usage();
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}
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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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printf( "# suggested latency, half duplex PaStreamInfo::outputLatency, half duplex PaStreamInfo::inputLatency, full duplex PaStreamInfo::outputLatency, full 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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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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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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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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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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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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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 occurred 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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