1 /********************************************************************
2 * *
3 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
4 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
5 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
6 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
7 * *
8 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 *
9 * by the Xiph.Org Foundation http://www.xiph.org/ *
10 * *
11 ********************************************************************
12
13 function: simple example decoder using vorbisfile
14 last mod: $Id: vorbisfile_example.c 16328 2009-07-24 01:51:10Z xiphmont $
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 <math.h>
25 #include <vorbis/codec.h>
26 #include <vorbis/vorbisfile.h>
27
28 #ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */
29 #include <io.h>
30 #include <fcntl.h>
31 #endif
32
33 char pcmout[4096]; /* take 4k out of the data segment, not the stack */
34
main()35 int main(){
36 OggVorbis_File vf;
37 int eof=0;
38 int current_section;
39
40 #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */
41 /* Beware the evil ifdef. We avoid these where we can, but this one we
42 cannot. Don't add any more, you'll probably go to hell if you do. */
43 _setmode( _fileno( stdin ), _O_BINARY );
44 _setmode( _fileno( stdout ), _O_BINARY );
45 #endif
46
47 if(ov_open_callbacks(stdin, &vf, NULL, 0, OV_CALLBACKS_NOCLOSE) < 0) {
48 fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n");
49 exit(1);
50 }
51
52 /* Throw the comments plus a few lines about the bitstream we're
53 decoding */
54 {
55 char **ptr=ov_comment(&vf,-1)->user_comments;
56 vorbis_info *vi=ov_info(&vf,-1);
57 while(*ptr){
58 fprintf(stderr,"%s\n",*ptr);
59 ++ptr;
60 }
61 fprintf(stderr,"\nBitstream is %d channel, %ldHz\n",vi->channels,vi->rate);
62 fprintf(stderr,"\nDecoded length: %ld samples\n",
63 (long)ov_pcm_total(&vf,-1));
64 fprintf(stderr,"Encoded by: %s\n\n",ov_comment(&vf,-1)->vendor);
65 }
66
67 while(!eof){
68 long ret=ov_read(&vf,pcmout,sizeof(pcmout),0,2,1,¤t_section);
69 if (ret == 0) {
70 /* EOF */
71 eof=1;
72 } else if (ret < 0) {
73 if(ret==OV_EBADLINK){
74 fprintf(stderr,"Corrupt bitstream section! Exiting.\n");
75 exit(1);
76 }
77
78 /* some other error in the stream. Not a problem, just reporting it in
79 case we (the app) cares. In this case, we don't. */
80 } else {
81 /* we don't bother dealing with sample rate changes, etc, but
82 you'll have to*/
83 fwrite(pcmout,1,ret,stdout);
84 }
85 }
86
87 /* cleanup */
88 ov_clear(&vf);
89
90 fprintf(stderr,"Done.\n");
91 return(0);
92 }
93