/* * $Id: patest_toomanysines.c,v 1.1.1.1 2003-05-09 16:03:56 ggeiger Exp $ * Play more sine waves than we can handle in real time as a stress test, * * Authors: * Ross Bencina * Phil Burk * * This program uses the PortAudio Portable Audio Library. * For more information see: http://www.audiomulch.com/portaudio/ * 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. * * 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. * * 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. * */ #include #include #include "portaudio.h" #define MAX_SINES (500) #define MAX_LOAD (1.2) #define SAMPLE_RATE (44100) #define FRAMES_PER_BUFFER (512) #ifndef M_PI #define M_PI (3.14159265) #endif #define TWOPI (M_PI * 2.0) typedef struct paTestData { int numSines; double phases[MAX_SINES]; } 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( void *inputBuffer, void *outputBuffer, unsigned long framesPerBuffer, PaTimestamp outTime, void *userData ) { paTestData *data = (paTestData*)userData; float *out = (float*)outputBuffer; unsigned long i; int j; int finished = 0; (void) outTime; /* Prevent unused variable warnings. */ (void) inputBuffer; for( i=0; inumSines; j++ ) { /* Advance phase of next oscillator. */ phase = data->phases[j]; phase += phaseInc; if( phase > TWOPI ) phase -= TWOPI; phaseInc *= 1.02; if( phaseInc > 0.5 ) phaseInc *= 0.5; /* This is not a very efficient way to calc sines. */ output += (float) sin( phase ); data->phases[j] = phase; } *out++ = (float) (output / data->numSines); } return finished; } /*******************************************************************/ int main(void); int main(void) { PortAudioStream *stream; PaError err; int numStress; paTestData data = {0}; double load; printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d. MAX_LOAD = %f\n", SAMPLE_RATE, FRAMES_PER_BUFFER, MAX_LOAD ); err = Pa_Initialize(); if( err != paNoError ) goto error; err = Pa_OpenStream( &stream, paNoDevice,/* default input device */ 0, /* no input */ paFloat32, /* 32 bit floating point input */ NULL, Pa_GetDefaultOutputDeviceID(), /* default output device */ 1, /* mono output */ paFloat32, /* 32 bit floating point output */ NULL, SAMPLE_RATE, FRAMES_PER_BUFFER, /* frames per buffer */ 0, /* number of buffers, if zero then use default minimum */ paClipOff, /* we won't output out of range samples so don't bother clipping them */ patestCallback, &data ); if( err != paNoError ) goto error; err = Pa_StartStream( stream ); if( err != paNoError ) goto error; /* Determine number of sines required to get to 50% */ do { data.numSines++; Pa_Sleep( 100 ); load = Pa_GetCPULoad( stream ); printf("numSines = %d, CPU load = %f\n", data.numSines, load ); } while( load < 0.5 ); /* Calculate target stress value then ramp up to that level*/ numStress = (int) (2.0 * data.numSines * MAX_LOAD ); for( ; data.numSines < numStress; data.numSines++ ) { Pa_Sleep( 200 ); load = Pa_GetCPULoad( stream ); printf("STRESSING: numSines = %d, CPU load = %f\n", data.numSines, load ); } printf("Suffer for 5 seconds.\n"); Pa_Sleep( 5000 ); printf("Stop stream.\n"); err = Pa_StopStream( stream ); if( err != paNoError ) goto error; err = Pa_CloseStream( stream ); 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; }