WSJT-X/portaudio-v19/pa_tests/patest_multi_sine.c
Diane Bruce 8d353a5b3b - Import of portaudio v19
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@189 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
2006-07-06 03:57:24 +00:00

195 lines
7.0 KiB
C

/** @file patest_multi_sine.c
@brief Play a different sine wave on each channel.
@author Phil Burk http://www.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.
*
* 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 <stdio.h>
#include <math.h>
#include "portaudio.h"
#define SAMPLE_RATE (44100)
#define FRAMES_PER_BUFFER (256)
#define FREQ_INCR (300.0 / SAMPLE_RATE)
#define MAX_CHANNELS (64)
#ifndef M_PI
#define M_PI (3.14159265)
#endif
typedef struct
{
short interleaved; /* Nonzero for interleaved / zero for non-interleaved. */
int numChannels; /* Actually used. */
double phases[MAX_CHANNELS]; /* Each channel gets its' own frequency. */
}
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)
{
int frameIndex, channelIndex;
float** outputs = (float**)outputBuffer;
paTestData* data = (paTestData*)userData;
(void) inputBuffer; /* Prevent unused arg warning. */
if (data->interleaved)
{
float *out = (float*)outputBuffer; /* interleaved version */
for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ )
{
for( channelIndex=0; channelIndex<data->numChannels; channelIndex++ )
{
/* Output sine wave on every channel. */
*out++ = (float) sin(data->phases[channelIndex]);
/* Play each channel at a higher frequency. */
data->phases[channelIndex] += FREQ_INCR * (4 + channelIndex);
if( data->phases[channelIndex] >= (2.0 * M_PI) ) data->phases[channelIndex] -= (2.0 * M_PI);
}
}
}
else
{
for( frameIndex=0; frameIndex<(int)framesPerBuffer; frameIndex++ )
{
for( channelIndex=0; channelIndex<data->numChannels; channelIndex++ )
{
/* Output sine wave on every channel. */
outputs[channelIndex][frameIndex] = (float) sin(data->phases[channelIndex]);
/* Play each channel at a higher frequency. */
data->phases[channelIndex] += FREQ_INCR * (4 + channelIndex);
if( data->phases[channelIndex] >= (2.0 * M_PI) ) data->phases[channelIndex] -= (2.0 * M_PI);
}
}
}
return 0;
}
/*******************************************************************/
int test(short interleaved)
{
PaStream* stream;
PaStreamParameters outputParameters;
PaError err;
const PaDeviceInfo* pdi;
paTestData data;
short n;
outputParameters.device = Pa_GetDefaultOutputDevice(); /* Default output device, max channels. */
pdi = Pa_GetDeviceInfo(outputParameters.device);
outputParameters.channelCount = pdi->maxOutputChannels;
if (outputParameters.channelCount > MAX_CHANNELS)
outputParameters.channelCount = MAX_CHANNELS;
outputParameters.sampleFormat = paFloat32; /* 32 bit floating point output */
outputParameters.suggestedLatency = pdi->defaultLowOutputLatency;
outputParameters.hostApiSpecificStreamInfo = NULL;
data.interleaved = interleaved;
data.numChannels = outputParameters.channelCount;
for (n = 0; n < data.numChannels; n++)
data.phases[n] = 0.0; /* Phases wrap and maybe don't need initialisation. */
printf("%d ", data.numChannels);
if (interleaved)
printf("interleaved ");
else
{
printf(" non-interleaved ");
outputParameters.sampleFormat |= paNonInterleaved;
}
printf("channels.\n");
err = Pa_OpenStream(&stream,
NULL, /* No input. */
&outputParameters,
SAMPLE_RATE, /* Sample rate. */
FRAMES_PER_BUFFER, /* Frames per buffer. */
paClipOff, /* Samples never out of range, no clipping. */
patestCallback,
&data);
if (err == paNoError)
{
err = Pa_StartStream(stream);
if (err == paNoError)
{
printf("Hit ENTER to stop this test.\n");
getchar();
err = Pa_StopStream(stream);
}
Pa_CloseStream( stream );
}
return err;
}
/*******************************************************************/
int main(void)
{
PaError err;
printf("PortAudio Test: output sine wave on each channel.\n" );
err = Pa_Initialize();
if (err != paNoError)
goto done;
err = test(1); /* 1 means interleaved. */
if (err != paNoError)
goto done;
err = test(0); /* 0 means not interleaved. */
if (err != paNoError)
goto done;
printf("Test finished.\n");
done:
if (err)
{
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));
}
Pa_Terminate();
return 0;
}