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diff --git a/portaudio/test/patest_maxsines.c b/portaudio/test/patest_maxsines.c
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-/** @file patest_maxsines.c
- @ingroup test_src
- @brief How many sine waves can we calculate and play in less than 80% CPU Load.
- @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 (2000)
-#define MAX_USAGE (0.5)
-#define SAMPLE_RATE (44100)
-#define FREQ_TO_PHASE_INC(freq) (freq/(float)SAMPLE_RATE)
-
-#define MIN_PHASE_INC FREQ_TO_PHASE_INC(200.0f)
-#define MAX_PHASE_INC (MIN_PHASE_INC * (1 << 5))
-
-#define FRAMES_PER_BUFFER (512)
-#ifndef M_PI
-#define M_PI (3.14159265)
-#endif
-#define TWOPI (M_PI * 2.0)
-
-#define TABLE_SIZE (1024)
-
-typedef struct paTestData
-{
- int numSines;
- float sine[TABLE_SIZE + 1]; /* add one for guard point for interpolation */
- float phases[MAX_SINES];
-}
-paTestData;
-
-/* Convert phase between 0.0 and 1.0 to sine value
- * using linear interpolation.
- */
-float LookupSine( paTestData *data, float phase );
-float LookupSine( paTestData *data, float phase )
-{
- float fIndex = phase*TABLE_SIZE;
- int index = (int) fIndex;
- float fract = fIndex - index;
- float lo = data->sine[index];
- float hi = data->sine[index+1];
- float val = lo + fract*(hi-lo);
- return val;
-}
-
-/* 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;
- float outSample;
- float scaler;
- int numForScale;
- unsigned long i;
- int j;
- int finished = 0;
- (void) inputBuffer; /* Prevent unused argument warning. */
-
- /* Determine amplitude scaling factor */
- numForScale = data->numSines;
- if( numForScale < 8 ) numForScale = 8; /* prevent pops at beginning */
- scaler = 1.0f / numForScale;
-
- for( i=0; i<framesPerBuffer; i++ )
- {
- float output = 0.0;
- float phaseInc = MIN_PHASE_INC;
- float phase;
- for( j=0; j<data->numSines; j++ )
- {
- /* Advance phase of next oscillator. */
- phase = data->phases[j];
- phase += phaseInc;
- if( phase >= 1.0 ) phase -= 1.0;
-
- output += LookupSine(data, phase);
- data->phases[j] = phase;
-
- phaseInc *= 1.02f;
- if( phaseInc > MAX_PHASE_INC ) phaseInc = MIN_PHASE_INC;
- }
-
- outSample = (float) (output * scaler);
- *out++ = outSample; /* Left */
- *out++ = outSample; /* Right */
- }
- return finished;
-}
-
-/*******************************************************************/
-int main(void);
-int main(void)
-{
- int i;
- PaStream* stream;
- PaStreamParameters outputParameters;
- PaError err;
- paTestData data = {0};
- double load;
-
- printf("PortAudio Test: output sine wave. SR = %d, BufSize = %d\n", SAMPLE_RATE, FRAMES_PER_BUFFER);
-
- /* initialise sinusoidal wavetable */
- for( i=0; i<TABLE_SIZE; i++ )
- {
- data.sine[i] = (float) sin( ((double)i/(double)TABLE_SIZE) * M_PI * 2. );
- }
- data.sine[TABLE_SIZE] = data.sine[0]; /* set guard point */
-
- 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 = 2; /* Stereo output. */
- outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output. */
- outputParameters.hostApiSpecificStreamInfo = NULL;
- outputParameters.suggestedLatency = Pa_GetDeviceInfo(outputParameters.device)
- ->defaultHighOutputLatency;
- err = Pa_OpenStream(&stream,
- NULL, /* no input */
- &outputParameters,
- SAMPLE_RATE,
- FRAMES_PER_BUFFER,
- paClipOff, /* No out of range samples should occur. */
- patestCallback,
- &data);
- if( err != paNoError )
- goto error;
-
- err = Pa_StartStream( stream );
- if( err != paNoError )
- goto error;
-
- /* Play an increasing number of sine waves until we hit MAX_USAGE */
- do {
- data.numSines += 10;
- Pa_Sleep(200);
- load = Pa_GetStreamCpuLoad(stream);
- printf("numSines = %d, CPU load = %f\n", data.numSines, load );
- fflush(stdout);
- } while((load < MAX_USAGE) && (data.numSines < MAX_SINES));
-
- Pa_Sleep(2000); /* Stay for 2 seconds at max CPU. */
-
- 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;
-}
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