/********************************************************************

 *                                                                  *

 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *

 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *

 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *

 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *

 *                                                                  *

 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *

 * by the Xiph.Org Foundation http://www.xiph.org/                  *

 *                                                                  *

 ********************************************************************

 function: simple example decoder using vorbisfile

 last mod: $Id: vorbisfile_example.c 16328 2009-07-24 01:51:10Z xiphmont $

 ********************************************************************/

/* Takes a vorbis bitstream from stdin and writes raw stereo PCM to

   stdout using vorbisfile. Using vorbisfile is much simpler than

   dealing with libvorbis. */

#include <stdio.h>

#include <stdlib.h>

#include <math.h>

#include <vorbis/codec.h>

#include <vorbis/vorbisfile.h>

#ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */

#include <io.h>

#include <fcntl.h>

#endif

char pcmout[4096]; /* take 4k out of the data segment, not the stack */

int main(){

  OggVorbis_File vf;

  int eof=0;

  int current_section;

#ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */

  /* Beware the evil ifdef. We avoid these where we can, but this one we 

     cannot. Don't add any more, you'll probably go to hell if you do. */

  _setmode( _fileno( stdin ), _O_BINARY );

  _setmode( _fileno( stdout ), _O_BINARY );

#endif

  if(ov_open_callbacks(stdin, &vf, NULL, 0, OV_CALLBACKS_NOCLOSE) < 0) {

      fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n");

      exit(1);

  }

  /* Throw the comments plus a few lines about the bitstream we're

     decoding */

  {

    char **ptr=ov_comment(&vf,-1)->user_comments;

    vorbis_info *vi=ov_info(&vf,-1);

    while(*ptr){

      fprintf(stderr,"%s\n",*ptr);

      ++ptr;

    }

    fprintf(stderr,"\nBitstream is %d channel, %ldHz\n",vi->channels,vi->rate);

    fprintf(stderr,"\nDecoded length: %ld samples\n",

            (long)ov_pcm_total(&vf,-1));

    fprintf(stderr,"Encoded by: %s\n\n",ov_comment(&vf,-1)->vendor);

  }

  while(!eof){

    long ret=ov_read(&vf,pcmout,sizeof(pcmout),0,2,1,&current_section);

    if (ret == 0) {

      /* EOF */

      eof=1;

    } else if (ret < 0) {

      if(ret==OV_EBADLINK){

        fprintf(stderr,"Corrupt bitstream section! Exiting.\n");

        exit(1);

      }

      /* some other error in the stream.  Not a problem, just reporting it in

         case we (the app) cares.  In this case, we don't. */

    } else {

      /* we don't bother dealing with sample rate changes, etc, but

         you'll have to*/

      fwrite(pcmout,1,ret,stdout);

    }

  }

  /* cleanup */

  ov_clear(&vf);

  fprintf(stderr,"Done.\n");

  return(0);

}