226 lines
7.6 KiB
C
226 lines
7.6 KiB
C
/** @file patest_out_underflow.c
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@ingroup test_src
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@brief Count output underflows (using paOutputUnderflow flag)
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under overloaded and normal conditions.
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@author Ross Bencina <rossb@audiomulch.com>
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@author Phil Burk <philburk@softsynth.com>
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*/
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/*
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* $Id: patest_out_underflow.c 1097 2006-08-26 08:27:53Z 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) 1999-2004 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 MAX_SINES (500)
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#define MAX_LOAD (1.2)
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#define SAMPLE_RATE (44100)
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#define FRAMES_PER_BUFFER (512)
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#ifndef M_PI
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#define M_PI (3.14159265)
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#endif
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#define TWOPI (M_PI * 2.0)
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typedef struct paTestData
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{
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int sineCount;
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double phases[MAX_SINES];
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int countUnderflows;
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int outputUnderflowCount;
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}
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paTestData;
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/* This routine will be called by the PortAudio engine when audio is needed.
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** It may called at interrupt level on some machines so don't do anything
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** that could mess up the system like calling malloc() or free().
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*/
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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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paTestData *data = (paTestData*)userData;
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float *out = (float*)outputBuffer;
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unsigned long i;
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int j;
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int finished = paContinue;
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(void) timeInfo; /* Prevent unused variable warning. */
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(void) inputBuffer; /* Prevent unused variable warning. */
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if( data->countUnderflows && (statusFlags & paOutputUnderflow) )
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data->outputUnderflowCount++;
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for( i=0; i<framesPerBuffer; i++ )
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{
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float output = 0.0;
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double phaseInc = 0.02;
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double phase;
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for( j=0; j<data->sineCount; j++ )
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{
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/* Advance phase of next oscillator. */
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phase = data->phases[j];
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phase += phaseInc;
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if( phase > TWOPI ) phase -= TWOPI;
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phaseInc *= 1.02;
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if( phaseInc > 0.5 ) phaseInc *= 0.5;
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/* This is not a very efficient way to calc sines. */
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output += (float) sin( phase );
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data->phases[j] = phase;
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}
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*out++ = (float) (output / data->sineCount);
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}
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return finished;
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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;
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PaStream *stream;
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PaError err;
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int safeSineCount, stressedSineCount;
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int safeUnderflowCount, stressedUnderflowCount;
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paTestData data = {0};
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double load;
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printf("PortAudio Test: output sine waves, count underflows. SR = %d, BufSize = %d. MAX_LOAD = %f\n",
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SAMPLE_RATE, FRAMES_PER_BUFFER, (float)MAX_LOAD );
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err = Pa_Initialize();
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if( err != paNoError ) goto error;
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outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */
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outputParameters.channelCount = 1; /* mono output */
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outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
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outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
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outputParameters.hostApiSpecificStreamInfo = NULL;
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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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&data );
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if( err != paNoError ) goto error;
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err = Pa_StartStream( stream );
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if( err != paNoError ) goto error;
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printf("Establishing load conditions...\n" );
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/* Determine number of sines required to get to 50% */
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do
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{
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data.sineCount++;
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Pa_Sleep( 100 );
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load = Pa_GetStreamCpuLoad( stream );
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printf("sineCount = %d, CPU load = %f\n", data.sineCount, load );
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}
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while( load < 0.5 && data.sineCount < (MAX_SINES-1));
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safeSineCount = data.sineCount;
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/* Calculate target stress value then ramp up to that level*/
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stressedSineCount = (int) (2.0 * data.sineCount * MAX_LOAD );
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if( stressedSineCount > MAX_SINES )
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stressedSineCount = MAX_SINES;
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for( ; data.sineCount < stressedSineCount; data.sineCount++ )
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{
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Pa_Sleep( 100 );
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load = Pa_GetStreamCpuLoad( stream );
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printf("STRESSING: sineCount = %d, CPU load = %f\n", data.sineCount, load );
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}
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printf("Counting underflows for 5 seconds.\n");
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data.countUnderflows = 1;
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Pa_Sleep( 5000 );
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stressedUnderflowCount = data.outputUnderflowCount;
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data.countUnderflows = 0;
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data.sineCount = safeSineCount;
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printf("Resuming safe load...\n");
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Pa_Sleep( 1500 );
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data.outputUnderflowCount = 0;
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Pa_Sleep( 1500 );
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load = Pa_GetStreamCpuLoad( stream );
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printf("sineCount = %d, CPU load = %f\n", data.sineCount, load );
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printf("Counting underflows for 5 seconds.\n");
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data.countUnderflows = 1;
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Pa_Sleep( 5000 );
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safeUnderflowCount = data.outputUnderflowCount;
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printf("Stop stream.\n");
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err = Pa_StopStream( stream );
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if( err != paNoError ) goto error;
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err = Pa_CloseStream( stream );
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if( err != paNoError ) goto error;
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Pa_Terminate();
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if( stressedUnderflowCount == 0 )
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printf("Test failed, no output underflows detected under stress.\n");
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else if( safeUnderflowCount != 0 )
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printf("Test failed, %d unexpected underflows detected under safe load.\n", safeUnderflowCount);
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else
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printf("Test passed, %d expected output underflows detected under stress, 0 unexpected underflows detected under safe load.\n", stressedUnderflowCount );
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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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