cannam@89: /** @file patest_out_underflow.c cannam@89: @ingroup test_src cannam@89: @brief Count output underflows (using paOutputUnderflow flag) cannam@89: under overloaded and normal conditions. cannam@89: @author Ross Bencina cannam@89: @author Phil Burk cannam@89: */ cannam@89: /* cannam@89: * $Id: patest_out_underflow.c 1609 2011-02-27 00:06:07Z philburk $ cannam@89: * cannam@89: * This program uses the PortAudio Portable Audio Library. cannam@89: * For more information see: http://www.portaudio.com cannam@89: * Copyright (c) 1999-2004 Ross Bencina and Phil Burk cannam@89: * cannam@89: * Permission is hereby granted, free of charge, to any person obtaining cannam@89: * a copy of this software and associated documentation files cannam@89: * (the "Software"), to deal in the Software without restriction, cannam@89: * including without limitation the rights to use, copy, modify, merge, cannam@89: * publish, distribute, sublicense, and/or sell copies of the Software, cannam@89: * and to permit persons to whom the Software is furnished to do so, cannam@89: * subject to the following conditions: cannam@89: * cannam@89: * The above copyright notice and this permission notice shall be cannam@89: * included in all copies or substantial portions of the Software. cannam@89: * cannam@89: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, cannam@89: * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF cannam@89: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. cannam@89: * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR cannam@89: * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF cannam@89: * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION cannam@89: * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. cannam@89: */ cannam@89: cannam@89: /* cannam@89: * The text above constitutes the entire PortAudio license; however, cannam@89: * the PortAudio community also makes the following non-binding requests: cannam@89: * cannam@89: * Any person wishing to distribute modifications to the Software is cannam@89: * requested to send the modifications to the original developer so that cannam@89: * they can be incorporated into the canonical version. It is also cannam@89: * requested that these non-binding requests be included along with the cannam@89: * license above. cannam@89: */ cannam@89: cannam@89: #include cannam@89: #include cannam@89: #include "portaudio.h" cannam@89: cannam@89: #define MAX_SINES (1000) cannam@89: #define MAX_LOAD (1.2) cannam@89: #define SAMPLE_RATE (44100) cannam@89: #define FRAMES_PER_BUFFER (512) cannam@89: #ifndef M_PI cannam@89: #define M_PI (3.14159265) cannam@89: #endif cannam@89: #define TWOPI (M_PI * 2.0) cannam@89: cannam@89: typedef struct paTestData cannam@89: { cannam@89: int sineCount; cannam@89: double phases[MAX_SINES]; cannam@89: int countUnderflows; cannam@89: int outputUnderflowCount; cannam@89: } cannam@89: paTestData; cannam@89: cannam@89: /* This routine will be called by the PortAudio engine when audio is needed. cannam@89: ** It may called at interrupt level on some machines so don't do anything cannam@89: ** that could mess up the system like calling malloc() or free(). cannam@89: */ cannam@89: static int patestCallback( const void *inputBuffer, void *outputBuffer, cannam@89: unsigned long framesPerBuffer, cannam@89: const PaStreamCallbackTimeInfo* timeInfo, cannam@89: PaStreamCallbackFlags statusFlags, cannam@89: void *userData ) cannam@89: { cannam@89: paTestData *data = (paTestData*)userData; cannam@89: float *out = (float*)outputBuffer; cannam@89: unsigned long i; cannam@89: int j; cannam@89: int finished = paContinue; cannam@89: (void) timeInfo; /* Prevent unused variable warning. */ cannam@89: (void) inputBuffer; /* Prevent unused variable warning. */ cannam@89: cannam@89: cannam@89: if( data->countUnderflows && (statusFlags & paOutputUnderflow) ) cannam@89: data->outputUnderflowCount++; cannam@89: cannam@89: for( i=0; isineCount; j++ ) cannam@89: { cannam@89: /* Advance phase of next oscillator. */ cannam@89: phase = data->phases[j]; cannam@89: phase += phaseInc; cannam@89: if( phase > TWOPI ) phase -= TWOPI; cannam@89: cannam@89: phaseInc *= 1.02; cannam@89: if( phaseInc > 0.5 ) phaseInc *= 0.5; cannam@89: cannam@89: /* This is not a very efficient way to calc sines. */ cannam@89: output += (float) sin( phase ); cannam@89: data->phases[j] = phase; cannam@89: } cannam@89: *out++ = (float) (output / data->sineCount); cannam@89: } cannam@89: cannam@89: return finished; cannam@89: } cannam@89: cannam@89: /*******************************************************************/ cannam@89: int main(void); cannam@89: int main(void) cannam@89: { cannam@89: PaStreamParameters outputParameters; cannam@89: PaStream *stream; cannam@89: PaError err; cannam@89: int safeSineCount, stressedSineCount; cannam@89: int safeUnderflowCount, stressedUnderflowCount; cannam@89: paTestData data = {0}; cannam@89: double load; cannam@89: cannam@89: cannam@89: printf("PortAudio Test: output sine waves, count underflows. SR = %d, BufSize = %d. MAX_LOAD = %f\n", cannam@89: SAMPLE_RATE, FRAMES_PER_BUFFER, (float)MAX_LOAD ); cannam@89: cannam@89: err = Pa_Initialize(); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ cannam@89: if (outputParameters.device == paNoDevice) { cannam@89: fprintf(stderr,"Error: No default output device.\n"); cannam@89: goto error; cannam@89: } cannam@89: outputParameters.channelCount = 1; /* mono output */ cannam@89: outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ cannam@89: outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; cannam@89: outputParameters.hostApiSpecificStreamInfo = NULL; cannam@89: cannam@89: err = Pa_OpenStream( cannam@89: &stream, cannam@89: NULL, /* no input */ cannam@89: &outputParameters, cannam@89: SAMPLE_RATE, cannam@89: FRAMES_PER_BUFFER, cannam@89: paClipOff, /* we won't output out of range samples so don't bother clipping them */ cannam@89: patestCallback, cannam@89: &data ); cannam@89: if( err != paNoError ) goto error; cannam@89: err = Pa_StartStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: printf("Establishing load conditions...\n" ); cannam@89: cannam@89: /* Determine number of sines required to get to 50% */ cannam@89: do cannam@89: { cannam@89: Pa_Sleep( 100 ); cannam@89: cannam@89: load = Pa_GetStreamCpuLoad( stream ); cannam@89: printf("sineCount = %d, CPU load = %f\n", data.sineCount, load ); cannam@89: cannam@89: if( load < 0.3 ) cannam@89: { cannam@89: data.sineCount += 10; cannam@89: } cannam@89: else if( load < 0.4 ) cannam@89: { cannam@89: data.sineCount += 2; cannam@89: } cannam@89: else cannam@89: { cannam@89: data.sineCount += 1; cannam@89: } cannam@89: cannam@89: } cannam@89: while( load < 0.5 && data.sineCount < (MAX_SINES-1)); cannam@89: cannam@89: safeSineCount = data.sineCount; cannam@89: cannam@89: /* Calculate target stress value then ramp up to that level*/ cannam@89: stressedSineCount = (int) (2.0 * data.sineCount * MAX_LOAD ); cannam@89: if( stressedSineCount > MAX_SINES ) cannam@89: stressedSineCount = MAX_SINES; cannam@89: for( ; data.sineCount < stressedSineCount; data.sineCount+=4 ) cannam@89: { cannam@89: Pa_Sleep( 100 ); cannam@89: load = Pa_GetStreamCpuLoad( stream ); cannam@89: printf("STRESSING: sineCount = %d, CPU load = %f\n", data.sineCount, load ); cannam@89: } cannam@89: cannam@89: printf("Counting underflows for 5 seconds.\n"); cannam@89: data.countUnderflows = 1; cannam@89: Pa_Sleep( 5000 ); cannam@89: cannam@89: stressedUnderflowCount = data.outputUnderflowCount; cannam@89: cannam@89: data.countUnderflows = 0; cannam@89: data.sineCount = safeSineCount; cannam@89: cannam@89: printf("Resuming safe load...\n"); cannam@89: Pa_Sleep( 1500 ); cannam@89: data.outputUnderflowCount = 0; cannam@89: Pa_Sleep( 1500 ); cannam@89: load = Pa_GetStreamCpuLoad( stream ); cannam@89: printf("sineCount = %d, CPU load = %f\n", data.sineCount, load ); cannam@89: cannam@89: printf("Counting underflows for 5 seconds.\n"); cannam@89: data.countUnderflows = 1; cannam@89: Pa_Sleep( 5000 ); cannam@89: cannam@89: safeUnderflowCount = data.outputUnderflowCount; cannam@89: cannam@89: printf("Stop stream.\n"); cannam@89: err = Pa_StopStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: err = Pa_CloseStream( stream ); cannam@89: if( err != paNoError ) goto error; cannam@89: cannam@89: Pa_Terminate(); cannam@89: cannam@89: if( stressedUnderflowCount == 0 ) cannam@89: printf("Test failed, no output underflows detected under stress.\n"); cannam@89: else if( safeUnderflowCount != 0 ) cannam@89: printf("Test failed, %d unexpected underflows detected under safe load.\n", safeUnderflowCount); cannam@89: else cannam@89: printf("Test passed, %d expected output underflows detected under stress, 0 unexpected underflows detected under safe load.\n", stressedUnderflowCount ); cannam@89: cannam@89: return err; cannam@89: error: cannam@89: Pa_Terminate(); cannam@89: fprintf( stderr, "An error occured while using the portaudio stream\n" ); cannam@89: fprintf( stderr, "Error number: %d\n", err ); cannam@89: fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); cannam@89: return err; cannam@89: }