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 <vorbis/ivorbiscodec.h>

    25 #include <vorbis/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 

    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),&current_section);

    68     if (ret == 0) {

    69       /* EOF */

    70       eof=1;

    71     } else if (ret < 0) {

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

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

    74     } else {

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

    76 	 you'll have to*/

    77       fwrite(pcmout,1,ret,stdout);

    78     }

    79   }

    80 

    81   /* cleanup */

    82   ov_clear(&vf);

    83     

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

    85   return(0);

    86 }