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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