mirror of
https://github.com/mamedev/mame.git
synced 2024-11-16 07:48:32 +01:00
216 lines
7.4 KiB
C
216 lines
7.4 KiB
C
/** @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: patest_maxsines.c 1368 2008-03-01 00:38:27Z rossb $
|
|
*
|
|
* 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 (500)
|
|
#define MAX_USAGE (0.8)
|
|
#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 (512)
|
|
|
|
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 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++;
|
|
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 around 80% 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 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;
|
|
}
|