93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
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/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. *
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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 SOURCE CODE IS (C) COPYRIGHT 1994-2007 *
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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 vorbisfile
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last mod: $Id: vorbisfile_example.c 16328 2009-07-24 01:51:10Z xiphmont $
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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 <math.h>
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#include <vorbis/codec.h>
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#include <vorbis/vorbisfile.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_callbacks(stdin, &vf, NULL, 0, OV_CALLBACKS_NOCLOSE) < 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),0,2,1,¤t_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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if(ret==OV_EBADLINK){
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fprintf(stderr,"Corrupt bitstream section! Exiting.\n");
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exit(1);
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}
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/* some other 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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}
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