Chris@1: /********************************************************************
Chris@1:  *                                                                  *
Chris@1:  * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
Chris@1:  * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
Chris@1:  * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
Chris@1:  * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
Chris@1:  *                                                                  *
Chris@1:  * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007             *
Chris@1:  * by the Xiph.Org Foundation http://www.xiph.org/                  *
Chris@1:  *                                                                  *
Chris@1:  ********************************************************************
Chris@1: 
Chris@1:  function: simple example decoder using vorbisfile
Chris@1:  last mod: $Id: vorbisfile_example.c 16328 2009-07-24 01:51:10Z xiphmont $
Chris@1: 
Chris@1:  ********************************************************************/
Chris@1: 
Chris@1: /* Takes a vorbis bitstream from stdin and writes raw stereo PCM to
Chris@1:    stdout using vorbisfile. Using vorbisfile is much simpler than
Chris@1:    dealing with libvorbis. */
Chris@1: 
Chris@1: #include <stdio.h>
Chris@1: #include <stdlib.h>
Chris@1: #include <math.h>
Chris@1: #include <vorbis/codec.h>
Chris@1: #include <vorbis/vorbisfile.h>
Chris@1: 
Chris@1: #ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */
Chris@1: #include <io.h>
Chris@1: #include <fcntl.h>
Chris@1: #endif
Chris@1: 
Chris@1: char pcmout[4096]; /* take 4k out of the data segment, not the stack */
Chris@1: 
Chris@1: int main(){
Chris@1:   OggVorbis_File vf;
Chris@1:   int eof=0;
Chris@1:   int current_section;
Chris@1: 
Chris@1: #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
Chris@1:   /* Beware the evil ifdef. We avoid these where we can, but this one we 
Chris@1:      cannot. Don't add any more, you'll probably go to hell if you do. */
Chris@1:   _setmode( _fileno( stdin ), _O_BINARY );
Chris@1:   _setmode( _fileno( stdout ), _O_BINARY );
Chris@1: #endif
Chris@1: 
Chris@1:   if(ov_open_callbacks(stdin, &vf, NULL, 0, OV_CALLBACKS_NOCLOSE) < 0) {
Chris@1:       fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n");
Chris@1:       exit(1);
Chris@1:   }
Chris@1: 
Chris@1:   /* Throw the comments plus a few lines about the bitstream we're
Chris@1:      decoding */
Chris@1:   {
Chris@1:     char **ptr=ov_comment(&vf,-1)->user_comments;
Chris@1:     vorbis_info *vi=ov_info(&vf,-1);
Chris@1:     while(*ptr){
Chris@1:       fprintf(stderr,"%s\n",*ptr);
Chris@1:       ++ptr;
Chris@1:     }
Chris@1:     fprintf(stderr,"\nBitstream is %d channel, %ldHz\n",vi->channels,vi->rate);
Chris@1:     fprintf(stderr,"\nDecoded length: %ld samples\n",
Chris@1:             (long)ov_pcm_total(&vf,-1));
Chris@1:     fprintf(stderr,"Encoded by: %s\n\n",ov_comment(&vf,-1)->vendor);
Chris@1:   }
Chris@1:   
Chris@1:   while(!eof){
Chris@1:     long ret=ov_read(&vf,pcmout,sizeof(pcmout),0,2,1,&current_section);
Chris@1:     if (ret == 0) {
Chris@1:       /* EOF */
Chris@1:       eof=1;
Chris@1:     } else if (ret < 0) {
Chris@1:       if(ret==OV_EBADLINK){
Chris@1:         fprintf(stderr,"Corrupt bitstream section! Exiting.\n");
Chris@1:         exit(1);
Chris@1:       }
Chris@1: 
Chris@1:       /* some other error in the stream.  Not a problem, just reporting it in
Chris@1:          case we (the app) cares.  In this case, we don't. */
Chris@1:     } else {
Chris@1:       /* we don't bother dealing with sample rate changes, etc, but
Chris@1:          you'll have to*/
Chris@1:       fwrite(pcmout,1,ret,stdout);
Chris@1:     }
Chris@1:   }
Chris@1: 
Chris@1:   /* cleanup */
Chris@1:   ov_clear(&vf);
Chris@1:     
Chris@1:   fprintf(stderr,"Done.\n");
Chris@1:   return(0);
Chris@1: }