2 #------------------------------------------------------------------------------
3 # vorbis: file(1) magic for Ogg/Vorbis files
5 # From Felix von Leitner <leitner@fefe.de>
6 # Extended by Beni Cherniavsky <cben@crosswinds.net>
7 # Further extended by Greg Wooledge <greg@wooledge.org>
9 # Most (everything but the number of channels and bitrate) is commented
10 # out with `##' as it's not interesting to the average user. The most
11 # probable things advanced users would want to uncomment are probably
12 # the number of comments and the encoder version.
15 0 string OggS Ogg data
16 >4 byte !0 UNKNOWN REVISION %u
17 ##>4 byte 0 revision 0
19 ##>>14 lelong x (Serial %lX)
20 # non-Vorbis content: FLAC (Free Lossless Audio Codec, http://flac.sourceforge.net)
21 >>28 string fLaC \b, FLAC audio
22 # non-Vorbis content: Theora
23 >>28 string \x80theora \b, Theora video
24 # non-Vorbis content: Speex
25 >>28 string Speex\ \ \ \b, Speex audio
26 # non-Vorbis content: OGM
27 >>28 string \x01video\0\0\0 \b, OGM video
28 >>>37 string/c div3 (DivX 3)
29 >>>37 string/c divx (DivX 4)
30 >>>37 string/c dx50 (DivX 5)
31 >>>37 string/c xvid (XviD)
32 # --- First vorbis packet - general header ---
33 >>28 string \x01vorbis \b, Vorbis audio,
34 >>>35 lelong !0 UNKNOWN VERSION %lu,
35 ##>>>35 lelong 0 version 0,
38 >>>>39 ubyte 2 stereo,
39 >>>>39 ubyte >2 %u channels,
40 >>>>40 lelong x %lu Hz
41 # Minimal, nominal and maximal bitrates specified when encoding
42 >>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff \b,
43 # The above tests if at least one of these is specified:
45 # Vorbis RC2 has a bug which puts -1000 in the min/max bitrate fields
47 # Vorbis 1.0 uses 0 instead of -1.
49 >>>>>>>52 lelong !-1000
50 >>>>>>>>52 lelong x <%lu
52 >>>>>>48 lelong x ~%lu
54 >>>>>>44 lelong !-1000
56 >>>>>>>>44 lelong x >%lu
57 >>>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff bps
58 # -- Second vorbis header packet - the comments
59 # A kludge to read the vendor string. It's a counted string, not a
60 # zero-terminated one, so file(1) can't read it in a generic way.
61 # libVorbis is the only one existing currently, so I detect specifically
62 # it. The interesting value is the cvs date (8 digits decimal).
63 # Post-RC1 Ogg files have the second header packet (and thus the version)
64 # in a different place, so we must use an indirect offset.
65 >>>(84.b+85) string \x03vorbis
66 >>>>(84.b+96) string/c Xiphophorus\ libVorbis\ I \b, created by: Xiphophorus libVorbis I
67 >>>>>(84.b+120) string >00000000
68 # Map to beta version numbers:
69 >>>>>>(84.b+120) string <20000508 (<beta1, prepublic)
70 >>>>>>(84.b+120) string 20000508 (1.0 beta 1 or beta 2)
71 >>>>>>(84.b+120) string >20000508
72 >>>>>>>(84.b+120) string <20001031 (beta2-3)
73 >>>>>>(84.b+120) string 20001031 (1.0 beta 3)
74 >>>>>>(84.b+120) string >20001031
75 >>>>>>>(84.b+120) string <20010225 (beta3-4)
76 >>>>>>(84.b+120) string 20010225 (1.0 beta 4)
77 >>>>>>(84.b+120) string >20010225
78 >>>>>>>(84.b+120) string <20010615 (beta4-RC1)
79 >>>>>>(84.b+120) string 20010615 (1.0 RC1)
80 >>>>>>(84.b+120) string 20010813 (1.0 RC2)
81 >>>>>>(84.b+120) string 20010816 (RC2 - Garf tuned v1)
82 >>>>>>(84.b+120) string 20011014 (RC2 - Garf tuned v2)
83 >>>>>>(84.b+120) string 20011217 (1.0 RC3)
84 >>>>>>(84.b+120) string 20011231 (1.0 RC3)
85 # Some pre-1.0 CVS snapshots still had "Xiphphorus"...
86 >>>>>>(84.b+120) string >20011231 (pre-1.0 CVS)
87 # For the 1.0 release, Xiphophorus is replaced by Xiph.Org
88 >>>>(84.b+96) string/c Xiph.Org\ libVorbis\ I \b, created by: Xiph.Org libVorbis I
89 >>>>>(84.b+117) string >00000000
90 >>>>>>(84.b+117) string <20020717 (pre-1.0 CVS)
91 >>>>>>(84.b+117) string 20020717 (1.0)
92 >>>>>>(84.b+117) string 20030909 (1.0.1)
93 >>>>>>(84.b+117) string 20040629 (1.1.0 RC1)