From 062e8a7a8654d519536036e2b70b0c6661e79e5b Mon Sep 17 00:00:00 2001 From: philburk Date: Thu, 28 Jul 2011 04:59:17 +0000 Subject: [PATCH] Draft version for debugging latency and timing. --- qa/paqa_latency.c | 234 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 234 insertions(+) create mode 100644 qa/paqa_latency.c diff --git a/qa/paqa_latency.c b/qa/paqa_latency.c new file mode 100644 index 0000000..4d526e7 --- /dev/null +++ b/qa/paqa_latency.c @@ -0,0 +1,234 @@ +/** @file patest_sine.c + @ingroup test_src + @brief Play a sine wave for several seconds. + @author Ross Bencina + @author Phil Burk +*/ +/* + * $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 +#include +#include "portaudio.h" + +#define NUM_SECONDS (5) +#define SAMPLE_RATE (44100) +#define FRAMES_PER_BUFFER (64) + +#ifndef M_PI +#define M_PI (3.14159265) +#endif + +#define TABLE_SIZE (200) +typedef struct +{ + float sine[TABLE_SIZE]; + int left_phase; + int right_phase; + char message[20]; + int minFramesPerBuffer; + int maxFramesPerBuffer; +} +paTestData; + +/* This routine will be called by the PortAudio engine when audio is needed. +** It may called at interrupt level on some machines so don't do anything +** that could mess up the system like calling malloc() or free(). +*/ +static int patestCallback( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ) +{ + paTestData *data = (paTestData*)userData; + float *out = (float*)outputBuffer; + unsigned long i; + + (void) timeInfo; /* Prevent unused variable warnings. */ + (void) statusFlags; + (void) inputBuffer; + + if( data->minFramesPerBuffer > framesPerBuffer ) + { + data->minFramesPerBuffer = framesPerBuffer; + } + + if( data->maxFramesPerBuffer < framesPerBuffer ) + { + data->maxFramesPerBuffer = framesPerBuffer; + } + + for( i=0; isine[data->left_phase]; /* left */ + *out++ = data->sine[data->right_phase]; /* right */ + data->left_phase += 1; + if( data->left_phase >= TABLE_SIZE ) data->left_phase -= TABLE_SIZE; + data->right_phase += 3; /* higher pitch so we can distinguish left and right. */ + if( data->right_phase >= TABLE_SIZE ) data->right_phase -= TABLE_SIZE; + } + + return paContinue; +} + +PaError paqaCheckLatency( PaStreamParameters *outputParamsPtr, + paTestData *dataPtr, double sampleRate, unsigned long framesPerBuffer ) +{ + PaError err; + PaStream *stream; + dataPtr->minFramesPerBuffer = 9999999; + dataPtr->maxFramesPerBuffer = 0; + printf("-------------------------------------\n"); + printf("Stream suggestedOutputLatency = %g\n", outputParamsPtr->suggestedLatency ); + err = Pa_OpenStream( + &stream, + NULL, /* no input */ + outputParamsPtr, + sampleRate, + framesPerBuffer, + paClipOff, /* we won't output out of range samples so don't bother clipping them */ + patestCallback, + dataPtr ); + if( err != paNoError ) goto error1; + + err = Pa_StartStream( stream ); + if( err != paNoError ) goto error2; + + printf("Play for %d seconds.\n", NUM_SECONDS ); + Pa_Sleep( NUM_SECONDS * 1000 ); + + const PaStreamInfo* streamInfo = Pa_GetStreamInfo( stream ); + printf("Stream inputLatency = %g\n", streamInfo->inputLatency ); + printf("Stream outputLatency = %g\n", streamInfo->outputLatency ); + printf(" minFramesPerBuffer = %4d\n", dataPtr->minFramesPerBuffer ); + printf(" maxFramesPerBuffer = %4d\n", dataPtr->maxFramesPerBuffer ); + + + err = Pa_StopStream( stream ); + if( err != paNoError ) goto error2; + + err = Pa_CloseStream( stream ); + Pa_Sleep( 1 * 1000 ); + + + return err; +error2: + Pa_CloseStream( stream ); +error1: + return err; +} + + +/*******************************************************************/ +int main(void); +int main(void) +{ + PaStreamParameters outputParameters; + PaError err; + paTestData data; + const PaDeviceInfo *deviceInfo; + int i; + int framesPerBuffer; + double sampleRate = 44100; + + + printf("PortAudio QA: investigate output latency. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER); + + /* initialise sinusoidal wavetable */ + for( i=0; idefaultLowOutputLatency); + printf("defaultHighOutputLatency = %f seconds\n", deviceInfo->defaultHighOutputLatency); + outputParameters.hostApiSpecificStreamInfo = NULL; + + // Try to use a small buffer that is smaller than we think the device can handle. + // Try to force combining multiple user buffers into a host buffer. + framesPerBuffer = 8; + outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency; + err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer ); + if( err != paNoError ) goto error; + + // Try to create a huge buffer that is bigger than the allowed device maximum. + framesPerBuffer = 16*1024; + outputParameters.suggestedLatency = ((double)framesPerBuffer) / sampleRate; // approximate + err = paqaCheckLatency( &outputParameters, &data, sampleRate, framesPerBuffer ); + if( err != paNoError ) goto error; + + outputParameters.suggestedLatency = 0.0; + err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified ); + if( err != paNoError ) goto error; + + outputParameters.suggestedLatency = deviceInfo->defaultLowOutputLatency; + err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified ); + if( err != paNoError ) goto error; + + outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency; + err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified ); + if( err != paNoError ) goto error; + + outputParameters.suggestedLatency = deviceInfo->defaultHighOutputLatency * 4; + err = paqaCheckLatency( &outputParameters, &data, sampleRate, paFramesPerBufferUnspecified ); + if( err != paNoError ) goto error; + + + Pa_Terminate(); + printf("Test finished.\n"); + + return err; +error: + Pa_Terminate(); + fprintf( stderr, "An error occured while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} -- 2.43.0