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 "config.h"
  26
  27 #include <stdio.h>
  28
  29 #include "core.h"
  30 #include "output.h"
  31
  32 /*******************
  33         Data
  34 ********************/
  35
  36 static FILE * f;
  37
  38 /* file positions where total number of samples is stored */
  39 static long _p1, _p2;
  40
  41 /* sample count */
  42 static int _sample_count;
  43
  44 /*******************
  45         Code
  46 ********************/
  47
  48 int _out_open_wav(char * file)
  49 {
  50         if((f=fopen(file, "w"))==NULL)
  51                 return(-100);
  52
  53         /* write wav header */
  54
  55         fwrite("RIFF",1,4,f);
  56         _p1=ftell(f);
  57         fput32(36, f);
  58         fwrite("WAVE",1,4,f);
  59         fwrite("fmt ",1,4,f);
  60         fput32(16,f);
  61         fput32(0x00020001, f);
  62         fput32(_frequency, f);
  63         fput32(_frequency * 4,f);
  64         fput32(0x00100004, f);
  65         fwrite("data",1,4,f);
  66         _p2=ftell(f);
  67         fput32(0, f);
  68
  69         _sample_count=0;
  70
  71         return(0);
  72 }
  73
  74
  75 int _out_write_wav(int lsample, int rsample)
  76 {
  77         fput16(lsample, f);
  78         fput16(rsample, f);
  79
  80         _sample_count++;
  81
  82         return(0);
  83 }
  84
  85
  86 int _out_close_wav(void)
  87 {
  88         /* rewind file and write total size */
  89         fseek(f, _p1, SEEK_SET);
  90         fput32((_sample_count * 4) + 36, f);
  91
  92         fseek(f, _p2, SEEK_SET);
  93         fput32(_sample_count * 4, f);
  94
  95         fclose(f);
  96
  97         return(0);
  98 }