Chris@39: /** @file patest_out_underflow.c Chris@39: @ingroup test_src Chris@39: @brief Count output underflows (using paOutputUnderflow flag) Chris@39: under overloaded and normal conditions. Chris@39: @author Ross Bencina Chris@39: @author Phil Burk Chris@39: */ Chris@39: /* Chris@39: * $Id: patest_out_underflow.c 1609 2011-02-27 00:06:07Z philburk $ Chris@39: * Chris@39: * This program uses the PortAudio Portable Audio Library. Chris@39: * For more information see: http://www.portaudio.com Chris@39: * Copyright (c) 1999-2004 Ross Bencina and Phil Burk Chris@39: * Chris@39: * Permission is hereby granted, free of charge, to any person obtaining Chris@39: * a copy of this software and associated documentation files Chris@39: * (the "Software"), to deal in the Software without restriction, Chris@39: * including without limitation the rights to use, copy, modify, merge, Chris@39: * publish, distribute, sublicense, and/or sell copies of the Software, Chris@39: * and to permit persons to whom the Software is furnished to do so, Chris@39: * subject to the following conditions: Chris@39: * Chris@39: * The above copyright notice and this permission notice shall be Chris@39: * included in all copies or substantial portions of the Software. Chris@39: * Chris@39: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, Chris@39: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF Chris@39: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. Chris@39: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR Chris@39: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF Chris@39: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION Chris@39: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Chris@39: */ Chris@39: Chris@39: /* Chris@39: * The text above constitutes the entire PortAudio license; however, Chris@39: * the PortAudio community also makes the following non-binding requests: Chris@39: * Chris@39: * Any person wishing to distribute modifications to the Software is Chris@39: * requested to send the modifications to the original developer so that Chris@39: * they can be incorporated into the canonical version. It is also Chris@39: * requested that these non-binding requests be included along with the Chris@39: * license above. Chris@39: */ Chris@39: Chris@39: #include Chris@39: #include Chris@39: #include "portaudio.h" Chris@39: Chris@39: #define MAX_SINES (1000) Chris@39: #define MAX_LOAD (1.2) Chris@39: #define SAMPLE_RATE (44100) Chris@39: #define FRAMES_PER_BUFFER (512) Chris@39: #ifndef M_PI Chris@39: #define M_PI (3.14159265) Chris@39: #endif Chris@39: #define TWOPI (M_PI * 2.0) Chris@39: Chris@39: typedef struct paTestData Chris@39: { Chris@39: int sineCount; Chris@39: double phases[MAX_SINES]; Chris@39: int countUnderflows; Chris@39: int outputUnderflowCount; Chris@39: } Chris@39: paTestData; Chris@39: Chris@39: /* This routine will be called by the PortAudio engine when audio is needed. Chris@39: ** It may called at interrupt level on some machines so don't do anything Chris@39: ** that could mess up the system like calling malloc() or free(). Chris@39: */ Chris@39: static int patestCallback( const void *inputBuffer, void *outputBuffer, Chris@39: unsigned long framesPerBuffer, Chris@39: const PaStreamCallbackTimeInfo* timeInfo, Chris@39: PaStreamCallbackFlags statusFlags, Chris@39: void *userData ) Chris@39: { Chris@39: paTestData *data = (paTestData*)userData; Chris@39: float *out = (float*)outputBuffer; Chris@39: unsigned long i; Chris@39: int j; Chris@39: int finished = paContinue; Chris@39: (void) timeInfo; /* Prevent unused variable warning. */ Chris@39: (void) inputBuffer; /* Prevent unused variable warning. */ Chris@39: Chris@39: Chris@39: if( data->countUnderflows && (statusFlags & paOutputUnderflow) ) Chris@39: data->outputUnderflowCount++; Chris@39: Chris@39: for( i=0; isineCount; j++ ) Chris@39: { Chris@39: /* Advance phase of next oscillator. */ Chris@39: phase = data->phases[j]; Chris@39: phase += phaseInc; Chris@39: if( phase > TWOPI ) phase -= TWOPI; Chris@39: Chris@39: phaseInc *= 1.02; Chris@39: if( phaseInc > 0.5 ) phaseInc *= 0.5; Chris@39: Chris@39: /* This is not a very efficient way to calc sines. */ Chris@39: output += (float) sin( phase ); Chris@39: data->phases[j] = phase; Chris@39: } Chris@39: *out++ = (float) (output / data->sineCount); Chris@39: } Chris@39: Chris@39: return finished; Chris@39: } Chris@39: Chris@39: /*******************************************************************/ Chris@39: int main(void); Chris@39: int main(void) Chris@39: { Chris@39: PaStreamParameters outputParameters; Chris@39: PaStream *stream; Chris@39: PaError err; Chris@39: int safeSineCount, stressedSineCount; Chris@39: int safeUnderflowCount, stressedUnderflowCount; Chris@39: paTestData data = {0}; Chris@39: double load; Chris@39: Chris@39: Chris@39: printf("PortAudio Test: output sine waves, count underflows. SR = %d, BufSize = %d. MAX_LOAD = %f\n", Chris@39: SAMPLE_RATE, FRAMES_PER_BUFFER, (float)MAX_LOAD ); Chris@39: Chris@39: err = Pa_Initialize(); Chris@39: if( err != paNoError ) goto error; Chris@39: Chris@39: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ Chris@39: if (outputParameters.device == paNoDevice) { Chris@39: fprintf(stderr,"Error: No default output device.\n"); Chris@39: goto error; Chris@39: } Chris@39: outputParameters.channelCount = 1; /* mono output */ Chris@39: outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ Chris@39: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; Chris@39: outputParameters.hostApiSpecificStreamInfo = NULL; Chris@39: Chris@39: err = Pa_OpenStream( Chris@39: &stream, Chris@39: NULL, /* no input */ Chris@39: &outputParameters, Chris@39: SAMPLE_RATE, Chris@39: FRAMES_PER_BUFFER, Chris@39: paClipOff, /* we won't output out of range samples so don't bother clipping them */ Chris@39: patestCallback, Chris@39: &data ); Chris@39: if( err != paNoError ) goto error; Chris@39: err = Pa_StartStream( stream ); Chris@39: if( err != paNoError ) goto error; Chris@39: Chris@39: printf("Establishing load conditions...\n" ); Chris@39: Chris@39: /* Determine number of sines required to get to 50% */ Chris@39: do Chris@39: { Chris@39: Pa_Sleep( 100 ); Chris@39: Chris@39: load = Pa_GetStreamCpuLoad( stream ); Chris@39: printf("sineCount = %d, CPU load = %f\n", data.sineCount, load ); Chris@39: Chris@39: if( load < 0.3 ) Chris@39: { Chris@39: data.sineCount += 10; Chris@39: } Chris@39: else if( load < 0.4 ) Chris@39: { Chris@39: data.sineCount += 2; Chris@39: } Chris@39: else Chris@39: { Chris@39: data.sineCount += 1; Chris@39: } Chris@39: Chris@39: } Chris@39: while( load < 0.5 && data.sineCount < (MAX_SINES-1)); Chris@39: Chris@39: safeSineCount = data.sineCount; Chris@39: Chris@39: /* Calculate target stress value then ramp up to that level*/ Chris@39: stressedSineCount = (int) (2.0 * data.sineCount * MAX_LOAD ); Chris@39: if( stressedSineCount > MAX_SINES ) Chris@39: stressedSineCount = MAX_SINES; Chris@39: for( ; data.sineCount < stressedSineCount; data.sineCount+=4 ) Chris@39: { Chris@39: Pa_Sleep( 100 ); Chris@39: load = Pa_GetStreamCpuLoad( stream ); Chris@39: printf("STRESSING: sineCount = %d, CPU load = %f\n", data.sineCount, load ); Chris@39: } Chris@39: Chris@39: printf("Counting underflows for 5 seconds.\n"); Chris@39: data.countUnderflows = 1; Chris@39: Pa_Sleep( 5000 ); Chris@39: Chris@39: stressedUnderflowCount = data.outputUnderflowCount; Chris@39: Chris@39: data.countUnderflows = 0; Chris@39: data.sineCount = safeSineCount; Chris@39: Chris@39: printf("Resuming safe load...\n"); Chris@39: Pa_Sleep( 1500 ); Chris@39: data.outputUnderflowCount = 0; Chris@39: Pa_Sleep( 1500 ); Chris@39: load = Pa_GetStreamCpuLoad( stream ); Chris@39: printf("sineCount = %d, CPU load = %f\n", data.sineCount, load ); Chris@39: Chris@39: printf("Counting underflows for 5 seconds.\n"); Chris@39: data.countUnderflows = 1; Chris@39: Pa_Sleep( 5000 ); Chris@39: Chris@39: safeUnderflowCount = data.outputUnderflowCount; Chris@39: Chris@39: printf("Stop stream.\n"); Chris@39: err = Pa_StopStream( stream ); Chris@39: if( err != paNoError ) goto error; Chris@39: Chris@39: err = Pa_CloseStream( stream ); Chris@39: if( err != paNoError ) goto error; Chris@39: Chris@39: Pa_Terminate(); Chris@39: Chris@39: if( stressedUnderflowCount == 0 ) Chris@39: printf("Test failed, no output underflows detected under stress.\n"); Chris@39: else if( safeUnderflowCount != 0 ) Chris@39: printf("Test failed, %d unexpected underflows detected under safe load.\n", safeUnderflowCount); Chris@39: else Chris@39: printf("Test passed, %d expected output underflows detected under stress, 0 unexpected underflows detected under safe load.\n", stressedUnderflowCount ); Chris@39: Chris@39: return err; Chris@39: error: Chris@39: Pa_Terminate(); Chris@39: fprintf( stderr, "An error occured while using the portaudio stream\n" ); Chris@39: fprintf( stderr, "Error number: %d\n", err ); Chris@39: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); Chris@39: return err; Chris@39: }