cannam@140: /** @file patest_toomanysines.c
cannam@140: 	@ingroup test_src
cannam@140: 	@brief Play more sine waves than we can handle in real time as a stress test.
cannam@140:     @todo This may not be needed now that we have "patest_out_overflow.c".
cannam@140: 	@author Ross Bencina <rossb@audiomulch.com>
cannam@140: 	@author Phil Burk <philburk@softsynth.com>
cannam@140: */
cannam@140: /*
cannam@140:  * $Id$
cannam@140:  *
cannam@140:  * This program uses the PortAudio Portable Audio Library.
cannam@140:  * For more information see: http://www.portaudio.com
cannam@140:  * Copyright (c) 1999-2000 Ross Bencina and Phil Burk
cannam@140:  *
cannam@140:  * Permission is hereby granted, free of charge, to any person obtaining
cannam@140:  * a copy of this software and associated documentation files
cannam@140:  * (the "Software"), to deal in the Software without restriction,
cannam@140:  * including without limitation the rights to use, copy, modify, merge,
cannam@140:  * publish, distribute, sublicense, and/or sell copies of the Software,
cannam@140:  * and to permit persons to whom the Software is furnished to do so,
cannam@140:  * subject to the following conditions:
cannam@140:  *
cannam@140:  * The above copyright notice and this permission notice shall be
cannam@140:  * included in all copies or substantial portions of the Software.
cannam@140:  *
cannam@140:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
cannam@140:  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
cannam@140:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
cannam@140:  * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
cannam@140:  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
cannam@140:  * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
cannam@140:  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
cannam@140:  */
cannam@140: 
cannam@140: /*
cannam@140:  * The text above constitutes the entire PortAudio license; however, 
cannam@140:  * the PortAudio community also makes the following non-binding requests:
cannam@140:  *
cannam@140:  * Any person wishing to distribute modifications to the Software is
cannam@140:  * requested to send the modifications to the original developer so that
cannam@140:  * they can be incorporated into the canonical version. It is also 
cannam@140:  * requested that these non-binding requests be included along with the 
cannam@140:  * license above.
cannam@140:  */
cannam@140: 
cannam@140: #include <stdio.h>
cannam@140: #include <math.h>
cannam@140: #include "portaudio.h"
cannam@140: 
cannam@140: #define MAX_SINES     (1000)
cannam@140: #define MAX_LOAD      (1.2)
cannam@140: #define SAMPLE_RATE   (44100)
cannam@140: #define FRAMES_PER_BUFFER  (512)
cannam@140: #ifndef M_PI
cannam@140: #define M_PI  (3.14159265)
cannam@140: #endif
cannam@140: #define TWOPI (M_PI * 2.0)
cannam@140: 
cannam@140: typedef struct paTestData
cannam@140: {
cannam@140:     int numSines;
cannam@140:     double phases[MAX_SINES];
cannam@140: }
cannam@140: paTestData;
cannam@140: 
cannam@140: /* This routine will be called by the PortAudio engine when audio is needed.
cannam@140: ** It may called at interrupt level on some machines so don't do anything
cannam@140: ** that could mess up the system like calling malloc() or free().
cannam@140: */
cannam@140: static int patestCallback( const void *inputBuffer, void *outputBuffer,
cannam@140:                            unsigned long framesPerBuffer,
cannam@140:                            const PaStreamCallbackTimeInfo* timeInfo,
cannam@140:                            PaStreamCallbackFlags statusFlags,
cannam@140:                            void *userData )
cannam@140: {
cannam@140:     paTestData *data = (paTestData*)userData;
cannam@140:     float *out = (float*)outputBuffer;
cannam@140:     unsigned long i;
cannam@140:     int j;
cannam@140:     int finished = 0;
cannam@140:     (void) inputBuffer; /* Prevent unused variable warning. */
cannam@140: 
cannam@140:     for( i=0; i<framesPerBuffer; i++ )
cannam@140:     {
cannam@140:         float output = 0.0;
cannam@140:         double phaseInc = 0.02;
cannam@140:         double phase;
cannam@140:         for( j=0; j<data->numSines; j++ )
cannam@140:         {
cannam@140:             /* Advance phase of next oscillator. */
cannam@140:             phase = data->phases[j];
cannam@140:             phase += phaseInc;
cannam@140:             if( phase > TWOPI ) phase -= TWOPI;
cannam@140: 
cannam@140:             phaseInc *= 1.02;
cannam@140:             if( phaseInc > 0.5 ) phaseInc *= 0.5;
cannam@140: 
cannam@140:             /* This is not a very efficient way to calc sines. */
cannam@140:             output += (float) sin( phase );
cannam@140:             data->phases[j] = phase;
cannam@140:         }
cannam@140:         *out++ = (float) (output / data->numSines);
cannam@140:     }
cannam@140:     return finished;
cannam@140: }
cannam@140: 
cannam@140: /*******************************************************************/
cannam@140: int main(void);
cannam@140: int main(void)
cannam@140: {
cannam@140:     PaStreamParameters outputParameters;
cannam@140:     PaStream *stream;
cannam@140:     PaError err;
cannam@140:     int numStress;
cannam@140:     paTestData data = {0};
cannam@140:     double load;
cannam@140: 
cannam@140:     printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d. MAX_LOAD = %f\n",
cannam@140:         SAMPLE_RATE, FRAMES_PER_BUFFER, MAX_LOAD );
cannam@140: 
cannam@140:     err = Pa_Initialize();
cannam@140:     if( err != paNoError ) goto error;
cannam@140:     
cannam@140:     outputParameters.device = Pa_GetDefaultOutputDevice();  /* default output device */
cannam@140:     if (outputParameters.device == paNoDevice) {
cannam@140:         fprintf(stderr,"Error: No default output device.\n");
cannam@140:         goto error;
cannam@140:     }
cannam@140:     outputParameters.channelCount = 1;                      /* mono output */
cannam@140:     outputParameters.sampleFormat = paFloat32;              /* 32 bit floating point output */
cannam@140:     outputParameters.suggestedLatency = Pa_GetDeviceInfo( outputParameters.device )->defaultLowOutputLatency;
cannam@140:     outputParameters.hostApiSpecificStreamInfo = NULL;
cannam@140: 
cannam@140:     err = Pa_OpenStream(
cannam@140:               &stream,
cannam@140:               NULL,         /* no input */
cannam@140:               &outputParameters,
cannam@140:               SAMPLE_RATE,
cannam@140:               FRAMES_PER_BUFFER,
cannam@140:               paClipOff,    /* we won't output out of range samples so don't bother clipping them */
cannam@140:               patestCallback,
cannam@140:               &data );    
cannam@140:     if( err != paNoError ) goto error;
cannam@140:     err = Pa_StartStream( stream );
cannam@140:     if( err != paNoError ) goto error;
cannam@140: 
cannam@140:     /* Determine number of sines required to get to 50% */
cannam@140:     do
cannam@140:     {        Pa_Sleep( 100 );
cannam@140: 
cannam@140:         load = Pa_GetStreamCpuLoad( stream );
cannam@140:         printf("numSines = %d, CPU load = %f\n", data.numSines, load );
cannam@140: 		
cannam@140: 		if( load < 0.3 )
cannam@140: 		{
cannam@140: 			data.numSines += 10;
cannam@140: 		}
cannam@140: 		else if( load < 0.4 )
cannam@140: 		{
cannam@140: 			data.numSines += 2;
cannam@140: 		}
cannam@140: 		else
cannam@140: 		{
cannam@140: 			data.numSines += 1;
cannam@140: 		}
cannam@140: 		
cannam@140:     }
cannam@140:     while( load < 0.5 );
cannam@140:     
cannam@140:     /* Calculate target stress value then ramp up to that level*/
cannam@140:     numStress = (int) (2.0 * data.numSines * MAX_LOAD );
cannam@140:     if( numStress > MAX_SINES )
cannam@140:         numStress = MAX_SINES;	
cannam@140:     for( ; data.numSines < numStress; data.numSines+=2 )
cannam@140:     {
cannam@140:         Pa_Sleep( 200 );
cannam@140:         load = Pa_GetStreamCpuLoad( stream );
cannam@140:         printf("STRESSING: numSines = %d, CPU load = %f\n", data.numSines, load );
cannam@140:     }
cannam@140:     
cannam@140:     printf("Suffer for 5 seconds.\n");
cannam@140:     Pa_Sleep( 5000 );
cannam@140:     
cannam@140:     printf("Stop stream.\n");
cannam@140:     err = Pa_StopStream( stream );
cannam@140:     if( err != paNoError ) goto error;
cannam@140:     
cannam@140:     err = Pa_CloseStream( stream );
cannam@140:     if( err != paNoError ) goto error;
cannam@140:     
cannam@140:     Pa_Terminate();
cannam@140:     printf("Test finished.\n");
cannam@140:     return err;
cannam@140: error:
cannam@140:     Pa_Terminate();
cannam@140:     fprintf( stderr, "An error occured while using the portaudio stream\n" );
cannam@140:     fprintf( stderr, "Error number: %d\n", err );
cannam@140:     fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
cannam@140:     return err;
cannam@140: }