apps/codecs/demac/wavwrite.c

   1 /*
   2
   3 demac - A Monkey's Audio decoder
   4
   5 $Id$
   6
   7 Copyright (C) Dave Chapman 2007
   8
   9 This program is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2 of the License, or
  12 (at your option) any later version.
  13
  14 This program is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with this program; if not, write to the Free Software
  21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
  22
  23 */
  24
  25 #include <stdio.h>
  26 #include <inttypes.h>
  27 #include <stdlib.h>
  28 #include "inttypes.h"
  29 #include <sys/stat.h>
  30 #include <fcntl.h>
  31 #include <unistd.h>
  32 #include <string.h>
  33
  34 #include "parser.h"
  35
  36 #ifndef __WIN32__
  37 #define O_BINARY 0
  38 #endif
  39
  40 static unsigned char wav_header[44]={
  41     'R','I','F','F',//  0 - ChunkID
  42     0,0,0,0,        //  4 - ChunkSize (filesize-8)
  43     'W','A','V','E',//  8 - Format
  44     'f','m','t',' ',// 12 - SubChunkID
  45     16,0,0,0,       // 16 - SubChunk1ID  // 16 for PCM
  46     1,0,            // 20 - AudioFormat (1=Uncompressed)
  47     2,0,            // 22 - NumChannels
  48     0,0,0,0,        // 24 - SampleRate in Hz
  49     0,0,0,0,        // 28 - Byte Rate (SampleRate*NumChannels*(BitsPerSample/8)
  50     4,0,            // 32 - BlockAlign (== NumChannels * BitsPerSample/8)
  51     16,0,           // 34 - BitsPerSample
  52     'd','a','t','a',// 36 - Subchunk2ID
  53     0,0,0,0         // 40 - Subchunk2Size
  54 };
  55
  56 int open_wav(struct ape_ctx_t* ape_ctx, char* filename)
  57 {
  58     int fd;
  59     int x;
  60     int filesize;
  61     int bytespersample;
  62
  63     fd=open(filename, O_CREAT|O_WRONLY|O_TRUNC|O_BINARY, 0644);
  64     if (fd < 0)
  65         return fd;
  66
  67     bytespersample=ape_ctx->bps/8;
  68
  69     filesize=ape_ctx->totalsamples*bytespersample*ape_ctx->channels+44;
  70
  71     // ChunkSize
  72     x=filesize-8;
  73     wav_header[4]=(x&0xff);
  74     wav_header[5]=(x&0xff00)>>8;
  75     wav_header[6]=(x&0xff0000)>>16;
  76     wav_header[7]=(x&0xff000000)>>24;
  77
  78     // Number of channels
  79     wav_header[22]=ape_ctx->channels;
  80
  81     // Samplerate
  82     wav_header[24]=ape_ctx->samplerate&0xff;
  83     wav_header[25]=(ape_ctx->samplerate&0xff00)>>8;
  84     wav_header[26]=(ape_ctx->samplerate&0xff0000)>>16;
  85     wav_header[27]=(ape_ctx->samplerate&0xff000000)>>24;
  86
  87     // ByteRate
  88     x=ape_ctx->samplerate*(ape_ctx->bps/8)*ape_ctx->channels;
  89     wav_header[28]=(x&0xff);
  90     wav_header[29]=(x&0xff00)>>8;
  91     wav_header[30]=(x&0xff0000)>>16;
  92     wav_header[31]=(x&0xff000000)>>24;
  93
  94     // BlockAlign
  95     wav_header[32]=(ape_ctx->bps/8)*ape_ctx->channels;
  96
  97     // Bits per sample
  98     wav_header[34]=ape_ctx->bps;
  99
 100     // Subchunk2Size
 101     x=filesize-44;
 102     wav_header[40]=(x&0xff);
 103     wav_header[41]=(x&0xff00)>>8;
 104     wav_header[42]=(x&0xff0000)>>16;
 105     wav_header[43]=(x&0xff000000)>>24;
 106
 107     write(fd,wav_header,sizeof(wav_header));
 108
 109     return fd;
 110 }