diff options
Diffstat (limited to '3rdparty/portaudio/test/patest_suggested_vs_streaminfo_latency.c')
| -rw-r--r-- | 3rdparty/portaudio/test/patest_suggested_vs_streaminfo_latency.c | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/3rdparty/portaudio/test/patest_suggested_vs_streaminfo_latency.c b/3rdparty/portaudio/test/patest_suggested_vs_streaminfo_latency.c new file mode 100644 index 0000000..c26d871 --- /dev/null +++ b/3rdparty/portaudio/test/patest_suggested_vs_streaminfo_latency.c @@ -0,0 +1,269 @@ +/** @file patest_suggested_vs_streaminfo_latency.c + @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 $ + * + * 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 <stdlib.h> +#include <string.h> +#include <math.h> +#include "portaudio.h" + +#define SAMPLE_RATE (44100) +#define FRAMES_PER_BUFFER 2//(128) +#define NUM_CHANNELS (2) + +#define SUGGESTED_LATENCY_START_SECONDS (0.0) +#define SUGGESTED_LATENCY_END_SECONDS (2.0) +#define SUGGESTED_LATENCY_INCREMENT_SECONDS (0.0005) /* half a millisecond increments */ + + +/* dummy callback. does nothing. never gets called */ +static int patestCallback( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ) +{ + return paContinue; +} + +/*******************************************************************/ +static void usage() +{ + int i; + const PaDeviceInfo *deviceInfo; + 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 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); + if( deviceInfo->maxInputChannels > 0 && deviceInfo->maxOutputChannels > 0 ) + channelString = "full-duplex"; + else if( deviceInfo->maxInputChannels > 0 ) + channelString = "input only"; + else + channelString = "output only"; + + fprintf( stderr, "%d (%s, %s, %s)\n", i, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name, channelString ); + } + Pa_Terminate(); + exit(-1); +} + +int main( int argc, const char* argv[] ); +int main( int argc, const char* argv[] ) +{ + PaStreamParameters inputParameters, outputParameters; + PaStream *stream; + PaError err; + PaTime suggestedLatency; + const PaStreamInfo *streamInfo; + const PaDeviceInfo *deviceInfo; + float sampleRate = SAMPLE_RATE; + int framesPerBuffer = FRAMES_PER_BUFFER; + err = Pa_Initialize(); + if( err != paNoError ) goto error; + + if( argc > 1 && strcmp(argv[1],"-h") == 0 ) + usage(); + + if( argc > 3 ){ + sampleRate = atoi(argv[3]); + } + + if( argc > 4 ){ + framesPerBuffer = atoi(argv[4]); + } + + printf("# sample rate=%f, frames per buffer=%d\n", (float)sampleRate, framesPerBuffer ); + + inputParameters.device = -1; + if( argc > 1 ) + inputParameters.device = atoi(argv[1]); + if( inputParameters.device == -1 ){ + inputParameters.device = Pa_GetDefaultInputDevice(); + if (inputParameters.device == paNoDevice) { + fprintf(stderr,"Error: No default input device available.\n"); + goto error; + } + }else{ + deviceInfo = Pa_GetDeviceInfo(inputParameters.device); + if( !deviceInfo ){ + fprintf(stderr,"Error: Invalid input device index.\n"); + usage(); + } + if( deviceInfo->maxInputChannels == 0 ){ + fprintf(stderr,"Error: Specified input device has no input channels (an output only device?).\n"); + usage(); + } + } + + inputParameters.channelCount = NUM_CHANNELS; + inputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ + inputParameters.hostApiSpecificStreamInfo = NULL; + + deviceInfo = Pa_GetDeviceInfo(inputParameters.device); + printf( "# using input device id %d (%s, %s)\n", inputParameters.device, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name ); + + + outputParameters.device = -1; + if( argc > 2 ) + outputParameters.device = atoi(argv[2]); + if( outputParameters.device == -1 ){ + outputParameters.device = Pa_GetDefaultOutputDevice(); + if (outputParameters.device == paNoDevice) { + fprintf(stderr,"Error: No default output device available.\n"); + goto error; + } + }else{ + deviceInfo = Pa_GetDeviceInfo(outputParameters.device); + if( !deviceInfo ){ + fprintf(stderr,"Error: Invalid output device index.\n"); + usage(); + } + if( deviceInfo->maxOutputChannels == 0 ){ + fprintf(stderr,"Error: Specified output device has no output channels (an input only device?).\n"); + usage(); + } + } + + outputParameters.channelCount = NUM_CHANNELS; + outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ + outputParameters.hostApiSpecificStreamInfo = NULL; + + deviceInfo = Pa_GetDeviceInfo(outputParameters.device); + printf( "# using output device id %d (%s, %s)\n", outputParameters.device, deviceInfo->name, Pa_GetHostApiInfo(deviceInfo->hostApi)->name ); + + + printf( "# suggested latency, half duplex PaStreamInfo::outputLatency, half duplex PaStreamInfo::inputLatency, full duplex PaStreamInfo::outputLatency, full duplex PaStreamInfo::inputLatency\n" ); + suggestedLatency = SUGGESTED_LATENCY_START_SECONDS; + while( suggestedLatency <= SUGGESTED_LATENCY_END_SECONDS ){ + + outputParameters.suggestedLatency = suggestedLatency; + inputParameters.suggestedLatency = suggestedLatency; + + printf( "%f, ", suggestedLatency ); + + /* ------------------------------ output ------------------------------ */ + + err = Pa_OpenStream( + &stream, + NULL, /* no input */ + &outputParameters, + sampleRate, + framesPerBuffer, + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + patestCallback, + 0 ); + if( err != paNoError ) goto error; + + streamInfo = Pa_GetStreamInfo( stream ); + + printf( "%f,", streamInfo->outputLatency ); + + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto error; + + /* ------------------------------ input ------------------------------ */ + + err = Pa_OpenStream( + &stream, + &inputParameters, + NULL, /* no output */ + sampleRate, + framesPerBuffer, + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + patestCallback, + 0 ); + if( err != paNoError ) goto error; + + streamInfo = Pa_GetStreamInfo( stream ); + + printf( "%f,", streamInfo->inputLatency ); + + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto error; + + /* ------------------------------ full duplex ------------------------------ */ + + err = Pa_OpenStream( + &stream, + &inputParameters, + &outputParameters, + sampleRate, + framesPerBuffer, + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + patestCallback, + 0 ); + if( err != paNoError ) goto error; + + streamInfo = Pa_GetStreamInfo( stream ); + + printf( "%f,%f", streamInfo->outputLatency, streamInfo->inputLatency ); + + err = Pa_CloseStream( stream ); + if( err != paNoError ) goto error; + + /* ------------------------------------------------------------ */ + + printf( "\n" ); + suggestedLatency += SUGGESTED_LATENCY_INCREMENT_SECONDS; + } + + Pa_Terminate(); + printf("# Test finished.\n"); + + return err; +error: + Pa_Terminate(); + fprintf( stderr, "An error occurred while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} |