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Diffstat (limited to 'portaudio/test/patest_toomanysines.c')
| -rw-r--r-- | portaudio/test/patest_toomanysines.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/portaudio/test/patest_toomanysines.c b/portaudio/test/patest_toomanysines.c new file mode 100644 index 0000000..2d32071 --- /dev/null +++ b/portaudio/test/patest_toomanysines.c @@ -0,0 +1,200 @@ +/** @file patest_toomanysines.c + @ingroup test_src + @brief Play more sine waves than we can handle in real time as a stress test. + @todo This may not be needed now that we have "patest_out_overflow.c". + @author Ross Bencina <rossb@audiomulch.com> + @author Phil Burk <philburk@softsynth.com> +*/ +/* + * $Id$ + * + * This program uses the PortAudio Portable Audio Library. + * For more information see: http://www.portaudio.com + * 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. + * + * 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. + */ + +/* + * The text above constitutes the entire PortAudio license; however, + * the PortAudio community also makes the following non-binding requests: + * + * 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. It is also + * requested that these non-binding requests be included along with the + * license above. + */ + +#include <stdio.h> +#include <math.h> +#include "portaudio.h" + +#define MAX_SINES (1000) +#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( const void *inputBuffer, void *outputBuffer, + unsigned long framesPerBuffer, + const PaStreamCallbackTimeInfo* timeInfo, + PaStreamCallbackFlags statusFlags, + void *userData ) +{ + paTestData *data = (paTestData*)userData; + float *out = (float*)outputBuffer; + unsigned long i; + int j; + int finished = 0; + (void) inputBuffer; /* Prevent unused variable warning. */ + + for( i=0; i<framesPerBuffer; i++ ) + { + float output = 0.0; + double phaseInc = 0.02; + double phase; + for( j=0; j<data->numSines; 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) +{ + PaStreamParameters outputParameters; + PaStream *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; + + outputParameters.device = Pa_GetDefaultOutputDevice(); /* default output device */ + if (outputParameters.device == paNoDevice) { + fprintf(stderr,"Error: No default output device.\n"); + goto error; + } + outputParameters.channelCount = 1; /* mono output */ + outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */ + outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency; + outputParameters.hostApiSpecificStreamInfo = NULL; + + err = Pa_OpenStream( + &stream, + NULL, /* no input */ + &outputParameters, + SAMPLE_RATE, + FRAMES_PER_BUFFER, + 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 + { Pa_Sleep( 100 ); + + load = Pa_GetStreamCpuLoad( stream ); + printf("numSines = %d, CPU load = %f\n", data.numSines, load ); + + if( load < 0.3 ) + { + data.numSines += 10; + } + else if( load < 0.4 ) + { + data.numSines += 2; + } + else + { + data.numSines += 1; + } + + } + while( load < 0.5 ); + + /* Calculate target stress value then ramp up to that level*/ + numStress = (int) (2.0 * data.numSines * MAX_LOAD ); + if( numStress > MAX_SINES ) + numStress = MAX_SINES; + for( ; data.numSines < numStress; data.numSines+=2 ) + { + Pa_Sleep( 200 ); + load = Pa_GetStreamCpuLoad( 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 occurred while using the portaudio stream\n" ); + fprintf( stderr, "Error number: %d\n", err ); + fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) ); + return err; +} |