misc/libtremor/ivorbisfile_example.c
author koda
Thu, 22 Sep 2011 01:18:31 +0200
changeset 5985 d276be65b745
parent 5170 f7e49eff3708
permissions -rw-r--r--
aligned credits and game modes to main release
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/********************************************************************
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 *                                                                  *
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 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
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 *                                                                  *
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 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
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 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
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 *                                                                  *
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 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
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 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
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 *                                                                  *
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 ********************************************************************
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 function: simple example decoder using vorbisidec
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 ********************************************************************/
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/* Takes a vorbis bitstream from stdin and writes raw stereo PCM to
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   stdout using vorbisfile. Using vorbisfile is much simpler than
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   dealing with libvorbis. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <vorbis/ivorbiscodec.h>
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#include <vorbis/ivorbisfile.h>
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#ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */
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#include <io.h>
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#include <fcntl.h>
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#endif
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char pcmout[4096]; /* take 4k out of the data segment, not the stack */
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int main(){
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  OggVorbis_File vf;
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  int eof=0;
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  int current_section;
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#ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
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  /* Beware the evil ifdef. We avoid these where we can, but this one we 
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     cannot. Don't add any more, you'll probably go to hell if you do. */
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  _setmode( _fileno( stdin ), _O_BINARY );
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  _setmode( _fileno( stdout ), _O_BINARY );
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#endif
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  if(ov_open(stdin, &vf, NULL, 0) < 0) {
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      fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n");
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      exit(1);
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  }
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  /* Throw the comments plus a few lines about the bitstream we're
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     decoding */
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  {
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    char **ptr=ov_comment(&vf,-1)->user_comments;
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    vorbis_info *vi=ov_info(&vf,-1);
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    while(*ptr){
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      fprintf(stderr,"%s\n",*ptr);
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      ++ptr;
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    }
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    fprintf(stderr,"\nBitstream is %d channel, %ldHz\n",vi->channels,vi->rate);
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    fprintf(stderr,"\nDecoded length: %ld samples\n",
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	    (long)ov_pcm_total(&vf,-1));
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    fprintf(stderr,"Encoded by: %s\n\n",ov_comment(&vf,-1)->vendor);
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  }
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  while(!eof){
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    long ret=ov_read(&vf,pcmout,sizeof(pcmout),&current_section);
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    if (ret == 0) {
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      /* EOF */
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      eof=1;
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    } else if (ret < 0) {
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      /* error in the stream.  Not a problem, just reporting it in
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	 case we (the app) cares.  In this case, we don't. */
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    } else {
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      /* we don't bother dealing with sample rate changes, etc, but
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	 you'll have to*/
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      fwrite(pcmout,1,ret,stdout);
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    }
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  }
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  /* cleanup */
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  ov_clear(&vf);
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  fprintf(stderr,"Done.\n");
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  return(0);
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}