[16] | 1 | /******************************************************************** |
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| 2 | * * |
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| 3 | * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE. * |
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| 4 | * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS * |
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| 5 | * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE * |
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| 6 | * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. * |
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| 7 | * * |
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| 8 | * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2007 * |
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| 9 | * by the Xiph.Org Foundation http://www.xiph.org/ * |
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| 10 | * * |
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| 11 | ******************************************************************** |
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| 12 | |
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| 13 | function: simple example decoder using vorbisfile |
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| 14 | last mod: $Id: vorbisfile_example.c 13293 2007-07-24 00:09:47Z xiphmont $ |
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| 15 | |
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| 16 | ********************************************************************/ |
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| 17 | |
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| 18 | /* Takes a vorbis bitstream from stdin and writes raw stereo PCM to |
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| 19 | stdout using vorbisfile. Using vorbisfile is much simpler than |
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| 20 | dealing with libvorbis. */ |
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| 21 | |
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| 22 | #include <stdio.h> |
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| 23 | #include <stdlib.h> |
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| 24 | #include <math.h> |
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| 25 | #include <vorbis/codec.h> |
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| 26 | #include <vorbis/vorbisfile.h> |
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| 27 | |
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| 28 | #ifdef _WIN32 /* We need the following two to set stdin/stdout to binary */ |
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| 29 | #include <io.h> |
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| 30 | #include <fcntl.h> |
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| 31 | #endif |
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| 32 | |
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| 33 | char pcmout[4096]; /* take 4k out of the data segment, not the stack */ |
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| 34 | |
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| 35 | int main(){ |
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| 36 | OggVorbis_File vf; |
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| 37 | int eof=0; |
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| 38 | int current_section; |
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| 39 | |
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| 40 | #ifdef _WIN32 /* We need to set stdin/stdout to binary mode. Damn windows. */ |
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| 41 | /* Beware the evil ifdef. We avoid these where we can, but this one we |
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| 42 | cannot. Don't add any more, you'll probably go to hell if you do. */ |
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| 43 | _setmode( _fileno( stdin ), _O_BINARY ); |
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| 44 | _setmode( _fileno( stdout ), _O_BINARY ); |
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| 45 | #endif |
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| 46 | |
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| 47 | if(ov_open_callbacks(stdin, &vf, NULL, 0, OV_CALLBACKS_NOCLOSE) < 0) { |
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| 48 | fprintf(stderr,"Input does not appear to be an Ogg bitstream.\n"); |
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| 49 | exit(1); |
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| 50 | } |
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| 51 | |
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| 52 | /* Throw the comments plus a few lines about the bitstream we're |
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| 53 | decoding */ |
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| 54 | { |
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| 55 | char **ptr=ov_comment(&vf,-1)->user_comments; |
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| 56 | vorbis_info *vi=ov_info(&vf,-1); |
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| 57 | while(*ptr){ |
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| 58 | fprintf(stderr,"%s\n",*ptr); |
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| 59 | ++ptr; |
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| 60 | } |
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| 61 | fprintf(stderr,"\nBitstream is %d channel, %ldHz\n",vi->channels,vi->rate); |
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| 62 | fprintf(stderr,"\nDecoded length: %ld samples\n", |
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| 63 | (long)ov_pcm_total(&vf,-1)); |
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| 64 | fprintf(stderr,"Encoded by: %s\n\n",ov_comment(&vf,-1)->vendor); |
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| 65 | } |
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| 66 | |
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| 67 | while(!eof){ |
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| 68 | long ret=ov_read(&vf,pcmout,sizeof(pcmout),0,2,1,¤t_section); |
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| 69 | if (ret == 0) { |
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| 70 | /* EOF */ |
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| 71 | eof=1; |
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| 72 | } else if (ret < 0) { |
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| 73 | /* error in the stream. Not a problem, just reporting it in |
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| 74 | case we (the app) cares. In this case, we don't. */ |
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| 75 | } else { |
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| 76 | /* we don't bother dealing with sample rate changes, etc, but |
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| 77 | you'll have to*/ |
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| 78 | fwrite(pcmout,1,ret,stdout); |
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| 79 | } |
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| 80 | } |
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| 81 | |
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| 82 | /* cleanup */ |
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| 83 | ov_clear(&vf); |
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| 84 | |
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| 85 | fprintf(stderr,"Done.\n"); |
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| 86 | return(0); |
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| 87 | } |
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