out_wav.c

   1 /*
   2
   3     PROGRAM_NAME PROGRAM_VERSION - PROGRAM_DESCRIPTION
   4
   5     Copyright (C) 2003 Angel Ortega <angel@triptico.com>
   6
   7     This program is free software; you can redistribute it and/or
   8     modify it under the terms of the GNU General Public License
   9     as published by the Free Software Foundation; either version 2
  10     of the License, or (at your option) any later version.
  11
  12     This program is distributed in the hope that it will be useful,
  13     but WITHOUT ANY WARRANTY; without even the implied warranty of
  14     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15     GNU General Public License for more details.
  16
  17     You should have received a copy of the GNU General Public License
  18     along with this program; if not, write to the Free Software
  19     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21     http://www.triptico.com
  22
  23 */
  24
  25 #include <stdio.h>
  26 #include "output.h"
  27
  28 /*******************
  29         Data
  30 ********************/
  31
  32 extern int _frequency;
  33
  34 static FILE * f;
  35
  36 /* file positions where total number of samples is stored */
  37 static long _p1, _p2;
  38
  39 /* sample count */
  40 static int _sample_count;
  41
  42 /*******************
  43         Code
  44 ********************/
  45
  46 int _out_open_wav(char * file)
  47 {
  48         if((f=fopen(file, "w"))==NULL)
  49                 return(-100);
  50
  51         /* write wav header */
  52
  53         fwrite("RIFF",1,4,f);
  54         _p1=ftell(f);
  55         fput32(36, f);
  56         fwrite("WAVE",1,4,f);
  57         fwrite("fmt ",1,4,f);
  58         fput32(16,f);
  59         fput32(0x00020001, f);
  60         fput32(_frequency, f);
  61         fput32(_frequency * 4,f);
  62         fput32(0x00100004, f);
  63         fwrite("data",1,4,f);
  64         _p2=ftell(f);
  65         fput32(0, f);
  66
  67         _sample_count=0;
  68
  69         return(0);
  70 }
  71
  72
  73 int _out_write_wav(int lsample, int rsample)
  74 {
  75         fput16(lsample, f);
  76         fput16(rsample, f);
  77
  78         _sample_count++;
  79
  80         return(0);
  81 }
  82
  83
  84 int _out_close_wav(void)
  85 {
  86         /* rewind file and write total size */
  87         fseek(f, _p1, SEEK_SET);
  88         fput32((_sample_count * 4) + 36, f);
  89
  90         fseek(f, _p2, SEEK_SET);
  91         fput32(_sample_count * 4, f);
  92
  93         fclose(f);
  94
  95         return(0);
  96 }