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 "ivorbiscodec.h"
25 #include "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
main()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),¤t_section);
68 if (ret == 0) {
69 /* EOF */
70 eof=1;
71 } else if (ret < 0) {
72 if(ret==OV_EBADLINK){
73 fprintf(stderr,"Corrupt bitstream section! Exiting.\n");
74 exit(1);
75 }
76
77 /* some other error in the stream. Not a problem, just reporting it in
78 case we (the app) cares. In this case, we don't. */
79 } else {
80 /* we don't bother dealing with sample rate changes, etc, but
81 you'll have to*/
82 fwrite(pcmout,1,ret,stdout);
83 }
84 }
85
86 /* cleanup */
87 ov_clear(&vf);
88
89 fprintf(stderr,"Done.\n");
90 return(0);
91 }
92