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 # --- First vorbis packet - general header ---
21 >>28 string \x01vorbis \b, Vorbis audio,
22 >>>35 lelong !0 UNKNOWN VERSION %lu,
23 ##>>>35 lelong 0 version 0,
26 >>>>39 ubyte 2 stereo,
27 >>>>39 ubyte >2 %u channels,
28 >>>>40 lelong x %lu Hz
29 # Minimal, nominal and maximal bitrates specified when encoding
30 >>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff \b,
31 # The above tests if at least one of these is specified:
33 # Vorbis RC2 has a bug which puts -1000 in the min/max bitrate fields
35 # Vorbis 1.0 uses 0 instead of -1.
36 >>>>>>44 lelong !-1000
38 >>>>>>>>44 lelong x >%lu
40 >>>>>>48 lelong x ~%lu
43 >>>>>>>52 lelong !-1000
44 >>>>>>>>52 lelong x <%lu
45 >>>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff bps
46 # -- Second vorbis header packet - the comments
47 # A kludge to read the vendor string. It's a counted string, not a
48 # zero-terminated one, so file(1) can't read it in a generic way.
49 # libVorbis is the only one existing currently, so I detect specifically
50 # it. The interesting value is the cvs date (8 digits decimal).
51 # Post-RC1 Ogg files have the second header packet (and thus the version)
52 # in a different place, so we must use an indirect offset.
53 >>>(84.b+85) string \x03vorbis
54 >>>>(84.b+96) string/c Xiphophorus\ libVorbis\ I \b, created by: Xiphophorus libVorbis I
55 >>>>>(84.b+120) string >00000000 %.8s
56 # Map to beta version numbers:
57 >>>>>>(84.b+120) string <20000508 (<beta1 - prepublic)
58 >>>>>>(84.b+120) string 20000508 (beta1/2)
59 >>>>>>(84.b+120) string >20000508
60 >>>>>>>(84.b+120) string <20001031 (beta2-3)
61 >>>>>>(84.b+120) string 20001031 (beta3)
62 >>>>>>(84.b+120) string >20001031
63 >>>>>>>(84.b+120) string <20010225 (beta3-4)
64 >>>>>>(84.b+120) string 20010225 (beta4)
65 >>>>>>(84.b+120) string >20010225
66 >>>>>>>(84.b+120) string <20010615 (beta4-RC1)
67 >>>>>>(84.b+120) string 20010615 (RC1)
68 >>>>>>(84.b+120) string 20010813 (RC2)
69 >>>>>>(84.b+120) string 20010816 (RC2 - Garf tuned v1)
70 >>>>>>(84.b+120) string 20011014 (RC2 - Garf tuned v2)
71 >>>>>>(84.b+120) string 20011217 (pre-RC3 CVS)
72 >>>>>>(84.b+120) string 20011231 (RC3)
73 # Some pre-1.0 CVS snapshots still had "Xiphphorus"...
74 >>>>>>(84.b+120) string >20011231 (pre-1.0 CVS)
75 # For the 1.0 release, Xiphophorus is replaced by Xiph.Org
76 >>>>(84.b+96) string/c Xiph.Org\ libVorbis\ I \b, created by: Xiph.Org libVorbis I
77 >>>>>(84.b+117) string >00000000 %.8s
78 >>>>>>(84.b+117) string <20020717 (pre-1.0 CVS)
79 >>>>>>(84.b+117) string 20020717 (1.0)