make_sine.c
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上传日期:2013-07-25
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文件大小:2k
- /*
- ** 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 */