Tremor/ivorbisfile_example.c

   1 /********************************************************************
   2  *                                                                  *
   3  * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
   4  *                                                                  *
   5  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   6  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   7  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   8  *                                                                  *
   9  * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
  10  * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
  11  *                                                                  *
  12  ********************************************************************
  13
  14  function: simple example decoder using vorbisidec
  15
  16  ********************************************************************/
  17
  18 /* Takes a vorbis bitstream from stdin and writes raw stereo PCM to
  19    stdout using vorbisfile. Using vorbisfile is much simpler than
  20    dealing with libvorbis. */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <vorbis/ivorbiscodec.h>
  25 #include <vorbis/ivorbisfile.h>
  26
  27 #ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */
  28 #include <io.h>
  29 #include <fcntl.h>
  30 #endif
  31
  32 char pcmout[4096]; /* take 4k out of the data segment, not the stack */
  33
  34 int main(){
  35   OggVorbis_File vf;
  36   int eof=0;
  37   int current_section;
  38
  39 #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
  40   /* Beware the evil ifdef. We avoid these where we can, but this one we
  41      cannot. Don't add any more, you'll probably go to hell if you do. */
  42   _setmode( _fileno( stdin ), _O_BINARY );
  43   _setmode( _fileno( stdout ), _O_BINARY );
  44 #endif
  45
  46   if(ov_open(stdin, &vf, NULL, 0) < 0) {
  47       fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n");
  48       exit(1);
  49   }
  50
  51   /* Throw the comments plus a few lines about the bitstream we're
  52      decoding */
  53   {
  54     char **ptr=ov_comment(&vf,-1)->user_comments;
  55     vorbis_info *vi=ov_info(&vf,-1);
  56     while(*ptr){
  57       fprintf(stderr,"%s\n",*ptr);
  58       ++ptr;
  59     }
  60     fprintf(stderr,"\nBitstream is %d channel, %ldHz\n",vi->channels,vi->rate);
  61     fprintf(stderr,"\nDecoded length: %ld samples\n",
  62             (long)ov_pcm_total(&vf,-1));
  63     fprintf(stderr,"Encoded by: %s\n\n",ov_comment(&vf,-1)->vendor);
  64   }
  65
  66   while(!eof){
  67     long ret=ov_read(&vf,pcmout,sizeof(pcmout),&current_section);
  68     if (ret == 0) {
  69       /* EOF */
  70       eof=1;
  71     } else if (ret < 0) {
  72       /* error in the stream.  Not a problem, just reporting it in
  73          case we (the app) cares.  In this case, we don't. */
  74     } else {
  75       /* we don't bother dealing with sample rate changes, etc, but
  76          you'll have to*/
  77       fwrite(pcmout,1,ret,stdout);
  78     }
  79   }
  80
  81   /* cleanup */
  82   ov_clear(&vf);
  83
  84   fprintf(stderr,"Done.\n");
  85   return(0);
  86 }