ref: 60fa9e81165a47bf492e0835459e2dedf72df660
dir: /common/libsndfile/examples/make_sine.c/
/*
** Copyright (C) 1999-2000 Erik de Castro Lopo <erikd@zip.com.au>
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <stdio.h>
#include <math.h>
#include <sndfile.h>
#define SINE_LENGTH (4096)
#ifndef M_PI
#define M_PI 3.14159
#endif
int main (void)
{ SNDFILE *file ;
SF_INFO sfinfo ;
int k ;
double val ;
memset (&sfinfo, 0, sizeof (sfinfo)) ;
sfinfo.samplerate = 8000 ;
sfinfo.samples = SINE_LENGTH ;
sfinfo.pcmbitwidth = 16 ;
sfinfo.channels = 1 ;
sfinfo.format = (SF_FORMAT_SVX | SF_FORMAT_PCM) ;
if (! (file = sf_open_write ("sine.svx", &sfinfo)))
{ printf ("Error : Not able to open output file.\n") ;
return 1 ;
} ;
for (k = 0 ; k < SINE_LENGTH ; k++)
{ val = 32000 * sin (2.0 * M_PI * ((double) k) / ((double) SINE_LENGTH)) ;
if (sf_write_double (file, &val, 1, 0) != 1)
sf_perror (file) ;
} ;
sf_close (file) ;
return 0 ;
} /* main */