mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-09-08 22:36:40 -04:00
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/trunk@189 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
109 lines
3.8 KiB
C
109 lines
3.8 KiB
C
/*
|
|
* $Id$
|
|
* test_w_saw.c
|
|
* Generate stereo sawtooth waveforms.
|
|
*
|
|
* Author: Phil Burk, http://www.softsynth.com
|
|
*
|
|
* This program uses PABLIO, the Portable Audio Blocking I/O Library.
|
|
* PABLIO is built on top of PortAudio, the Portable Audio Library.
|
|
*
|
|
* For more information see: http://www.audiomulch.com/portaudio/
|
|
* 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 <stdlib.h>
|
|
#include <math.h>
|
|
#include "pablio.h"
|
|
#include <string.h>
|
|
|
|
#define SAMPLE_RATE (44100)
|
|
#define NUM_SECONDS (6)
|
|
#define SAMPLES_PER_FRAME (2)
|
|
|
|
#define FREQUENCY (220.0f)
|
|
#define PHASE_INCREMENT (2.0f * FREQUENCY / SAMPLE_RATE)
|
|
#define FRAMES_PER_BLOCK (100)
|
|
|
|
float samples[FRAMES_PER_BLOCK][SAMPLES_PER_FRAME];
|
|
float phases[SAMPLES_PER_FRAME];
|
|
|
|
/*******************************************************************/
|
|
int main(void);
|
|
int main(void)
|
|
{
|
|
int i,j;
|
|
PaError err;
|
|
PABLIO_Stream *aOutStream;
|
|
|
|
printf("Generate sawtooth waves using PABLIO.\n");
|
|
fflush(stdout);
|
|
|
|
/* Open simplified blocking I/O layer on top of PortAudio. */
|
|
err = OpenAudioStream( &aOutStream, SAMPLE_RATE, paFloat32,
|
|
(PABLIO_WRITE | PABLIO_STEREO) );
|
|
if( err != paNoError ) goto error;
|
|
|
|
/* Initialize oscillator phases. */
|
|
phases[0] = 0.0;
|
|
phases[1] = 0.0;
|
|
|
|
for( i=0; i<(NUM_SECONDS * SAMPLE_RATE); i += FRAMES_PER_BLOCK )
|
|
{
|
|
/* Generate sawtooth waveforms in a block for efficiency. */
|
|
for( j=0; j<FRAMES_PER_BLOCK; j++ )
|
|
{
|
|
/* Generate a sawtooth wave by incrementing a variable. */
|
|
phases[0] += PHASE_INCREMENT;
|
|
/* The signal range is -1.0 to +1.0 so wrap around if we go over. */
|
|
if( phases[0] > 1.0f ) phases[0] -= 2.0f;
|
|
samples[j][0] = phases[0];
|
|
|
|
/* On the second channel, generate a sawtooth wave a fifth higher. */
|
|
phases[1] += PHASE_INCREMENT * (3.0f / 2.0f);
|
|
if( phases[1] > 1.0f ) phases[1] -= 2.0f;
|
|
samples[j][1] = phases[1];
|
|
}
|
|
|
|
/* Write samples to output. */
|
|
WriteAudioStream( aOutStream, samples, FRAMES_PER_BLOCK );
|
|
}
|
|
|
|
CloseAudioStream( aOutStream );
|
|
|
|
printf("Sawtooth sound test complete.\n" );
|
|
fflush(stdout);
|
|
return 0;
|
|
|
|
error:
|
|
fprintf( stderr, "An error occured while using PABLIO\n" );
|
|
fprintf( stderr, "Error number: %d\n", err );
|
|
fprintf( stderr, "Error message: %s\n", Pa_GetErrorText( err ) );
|
|
return -1;
|
|
}
|