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#------------------------------------------------------------------------------
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# $File: vorbis,v 1.16 2009/09/19 16:28:13 christos Exp $
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# vorbis: file(1) magic for Ogg/Vorbis files
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#
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# From Felix von Leitner <leitner@fefe.de>
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# Extended by Beni Cherniavsky <cben@crosswinds.net>
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# Further extended by Greg Wooledge <greg@wooledge.org>
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#
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# Most (everything but the number of channels and bitrate) is commented
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# out with `##' as it's not interesting to the average user. The most
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# probable things advanced users would want to uncomment are probably
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# the number of comments and the encoder version.
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#
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# FIXME: The first match has been made a search, so that it can skip
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# over prepended ID3 tags. This will work for MIME type detection, but
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# won't work for detecting other properties of the file (they all need
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# to be made relative to the search). In any case, if the file has ID3
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# tags, the ID3 information will be printed, not the Ogg information,
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# so until that's fixed, this doesn't matter.
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# FIXME[2]: Disable the above for now, since search assumes text mode.
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#
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# --- Ogg Framing ---
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#0 search/1000 OggS Ogg data
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0 string OggS Ogg data
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!:mime application/ogg
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>4 byte !0 UNKNOWN REVISION %u
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##>4 byte 0 revision 0
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>4 byte 0
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##>>14 lelong x (Serial %lX)
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# non-Vorbis content: FLAC (Free Lossless Audio Codec, http://flac.sourceforge.net)
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>>28 string \x7fFLAC \b, FLAC audio
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# non-Vorbis content: Theora
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>>28 string \x80theora \b, Theora video
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# non-Vorbis content: Kate
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>>28 string \x80kate\0\0\0\0 \b, Kate
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>>>37 ubyte x v%u
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>>>38 ubyte x \b.%u,
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>>>40 byte 0 utf8 encoding,
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>>>40 byte !0 unknown character encoding,
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>>>60 string >\0 language %s,
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>>>60 string \0 no language set,
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>>>76 string >\0 category %s
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>>>76 string \0 no category set
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# non-Vorbis content: Skeleton
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>>28 string fishead\0 \b, Skeleton
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>>>36 short x v%u
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>>>40 short x \b.%u
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# non-Vorbis content: Speex
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>>28 string Speex\ \ \ \b, Speex audio
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# non-Vorbis content: OGM
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>>28 string \x01video\0\0\0 \b, OGM video
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>>>37 string/c div3 (DivX 3)
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>>>37 string/c divx (DivX 4)
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>>>37 string/c dx50 (DivX 5)
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>>>37 string/c xvid (XviD)
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# --- First vorbis packet - general header ---
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>>28 string \x01vorbis \b, Vorbis audio,
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>>>35 lelong !0 UNKNOWN VERSION %lu,
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##>>>35 lelong 0 version 0,
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>>>35 lelong 0
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>>>>39 ubyte 1 mono,
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>>>>39 ubyte 2 stereo,
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>>>>39 ubyte >2 %u channels,
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>>>>40 lelong x %lu Hz
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# Minimal, nominal and maximal bitrates specified when encoding
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>>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff \b,
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# The above tests if at least one of these is specified:
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>>>>>52 lelong !-1
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# Vorbis RC2 has a bug which puts -1000 in the min/max bitrate fields
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# instead of -1.
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# Vorbis 1.0 uses 0 instead of -1.
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>>>>>>52 lelong !0
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>>>>>>>52 lelong !-1000
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>>>>>>>>52 lelong x <%lu
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>>>>>48 lelong !-1
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>>>>>>48 lelong x ~%lu
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>>>>>44 lelong !-1
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>>>>>>44 lelong !-1000
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>>>>>>>44 lelong !0
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>>>>>>>>44 lelong x >%lu
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>>>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff bps
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# -- Second vorbis header packet - the comments
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# A kludge to read the vendor string. It's a counted string, not a
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# zero-terminated one, so file(1) can't read it in a generic way.
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# libVorbis is the only one existing currently, so I detect specifically
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# it. The interesting value is the cvs date (8 digits decimal).
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# Post-RC1 Ogg files have the second header packet (and thus the version)
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# in a different place, so we must use an indirect offset.
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>>>(84.b+85) string \x03vorbis
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>>>>(84.b+96) string/c Xiphophorus\ libVorbis\ I \b, created by: Xiphophorus libVorbis I
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>>>>>(84.b+120) string >00000000
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# Map to beta version numbers:
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>>>>>>(84.b+120) string <20000508 (<beta1, prepublic)
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>>>>>>(84.b+120) string 20000508 (1.0 beta 1 or beta 2)
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>>>>>>(84.b+120) string >20000508
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>>>>>>>(84.b+120) string <20001031 (beta2-3)
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>>>>>>(84.b+120) string 20001031 (1.0 beta 3)
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>>>>>>(84.b+120) string >20001031
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>>>>>>>(84.b+120) string <20010225 (beta3-4)
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>>>>>>(84.b+120) string 20010225 (1.0 beta 4)
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>>>>>>(84.b+120) string >20010225
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>>>>>>>(84.b+120) string <20010615 (beta4-RC1)
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>>>>>>(84.b+120) string 20010615 (1.0 RC1)
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>>>>>>(84.b+120) string 20010813 (1.0 RC2)
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>>>>>>(84.b+120) string 20010816 (RC2 - Garf tuned v1)
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>>>>>>(84.b+120) string 20011014 (RC2 - Garf tuned v2)
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>>>>>>(84.b+120) string 20011217 (1.0 RC3)
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>>>>>>(84.b+120) string 20011231 (1.0 RC3)
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# Some pre-1.0 CVS snapshots still had "Xiphphorus"...
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>>>>>>(84.b+120) string >20011231 (pre-1.0 CVS)
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# For the 1.0 release, Xiphophorus is replaced by Xiph.Org
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>>>>(84.b+96) string/c Xiph.Org\ libVorbis\ I \b, created by: Xiph.Org libVorbis I
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>>>>>(84.b+117) string >00000000
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>>>>>>(84.b+117) string <20020717 (pre-1.0 CVS)
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>>>>>>(84.b+117) string 20020717 (1.0)
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>>>>>>(84.b+117) string 20030909 (1.0.1)
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>>>>>>(84.b+117) string 20040629 (1.1.0 RC1)
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