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