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+
+#------------------------------------------------------------------------------
+# $File: vorbis,v 1.26 2020/08/22 18:30:55 christos Exp $
+# vorbis: file(1) magic for Ogg/Vorbis files
+#
+# From Felix von Leitner <leitner@fefe.de>
+# Extended by Beni Cherniavsky <cben@crosswinds.net>
+# Further extended by Greg Wooledge <greg@wooledge.org>
+#
+# Most (everything but the number of channels and bitrate) is commented
+# out with `##' as it's not interesting to the average user. The most
+# probable things advanced users would want to uncomment are probably
+# the number of comments and the encoder version.
+#
+# FIXME: The first match has been made a search, so that it can skip
+# over prepended ID3 tags. This will work for MIME type detection, but
+# won't work for detecting other properties of the file (they all need
+# to be made relative to the search). In any case, if the file has ID3
+# tags, the ID3 information will be printed, not the Ogg information,
+# so until that's fixed, this doesn't matter.
+# FIXME[2]: Disable the above for now, since search assumes text mode.
+#
+# --- Ogg Framing ---
+#0 search/1000 OggS Ogg data
+0 string OggS Ogg data
+>4 byte !0 UNKNOWN REVISION %u
+##>4 byte 0 revision 0
+>4 byte 0
+##>>14 lelong x (Serial %lX)
+# non-Vorbis content: FLAC (Free Lossless Audio Codec, http://flac.sourceforge.net)
+>>28 string \x7fFLAC \b, FLAC audio
+# non-Vorbis content: Theora
+!:mime audio/ogg
+>>28 string \x80theora \b, Theora video
+!:mime video/ogg
+# non-Vorbis content: Kate
+>>28 string \x80kate\0\0\0\0 \b, Kate (Karaoke and Text)
+!:mime application/ogg
+>>>37 ubyte x v%u
+>>>38 ubyte x \b.%u,
+>>>40 byte 0 utf8 encoding,
+>>>40 byte !0 unknown character encoding,
+>>>60 string >\0 language %s,
+>>>60 string \0 no language set,
+>>>76 string >\0 category %s
+>>>76 string \0 no category set
+# non-Vorbis content: Skeleton
+>>28 string fishead\0 \b, Skeleton
+!:mime video/ogg
+>>>36 leshort x v%u
+>>>40 leshort x \b.%u
+# non-Vorbis content: Speex
+>>28 string Speex\ \ \ \b, Speex audio
+!:mime audio/ogg
+# non-Vorbis content: OGM
+>>28 string \x01video\0\0\0 \b, OGM video
+!:mime video/ogg
+>>>37 string/c div3 (DivX 3)
+>>>37 string/c divx (DivX 4)
+>>>37 string/c dx50 (DivX 5)
+>>>37 string/c xvid (XviD)
+# --- First vorbis packet - general header ---
+>>28 string \x01vorbis \b, Vorbis audio,
+!:mime audio/ogg
+>>>35 lelong !0 UNKNOWN VERSION %u,
+##>>>35 lelong 0 version 0,
+>>>35 lelong 0
+>>>>39 ubyte 1 mono,
+>>>>39 ubyte 2 stereo,
+>>>>39 ubyte >2 %u channels,
+>>>>40 lelong x %u Hz
+# Minimal, nominal and maximal bitrates specified when encoding
+>>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff \b,
+# The above tests if at least one of these is specified:
+>>>>>52 lelong !-1
+# Vorbis RC2 has a bug which puts -1000 in the min/max bitrate fields
+# instead of -1.
+# Vorbis 1.0 uses 0 instead of -1.
+>>>>>>52 lelong !0
+>>>>>>>52 lelong !-1000
+>>>>>>>>52 lelong x <%u
+>>>>>48 lelong !-1
+>>>>>>48 lelong x ~%u
+>>>>>44 lelong !-1
+>>>>>>44 lelong !-1000
+>>>>>>>44 lelong !0
+>>>>>>>>44 lelong x >%u
+>>>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff bps
+# -- Second vorbis header packet - the comments
+# A kludge to read the vendor string. It's a counted string, not a
+# zero-terminated one, so file(1) can't read it in a generic way.
+# libVorbis is the only one existing currently, so I detect specifically
+# it. The interesting value is the cvs date (8 digits decimal).
+# Post-RC1 Ogg files have the second header packet (and thus the version)
+# in a different place, so we must use an indirect offset.
+>>>(84.b+85) string \x03vorbis
+>>>>(84.b+96) string/c Xiphophorus\ libVorbis\ I \b, created by: Xiphophorus libVorbis I
+>>>>>(84.b+120) string >00000000
+# Map to beta version numbers:
+>>>>>>(84.b+120) string <20000508 (<beta1, prepublic)
+>>>>>>(84.b+120) string 20000508 (1.0 beta 1 or beta 2)
+>>>>>>(84.b+120) string >20000508
+>>>>>>>(84.b+120) string <20001031 (beta2-3)
+>>>>>>(84.b+120) string 20001031 (1.0 beta 3)
+>>>>>>(84.b+120) string >20001031
+>>>>>>>(84.b+120) string <20010225 (beta3-4)
+>>>>>>(84.b+120) string 20010225 (1.0 beta 4)
+>>>>>>(84.b+120) string >20010225
+>>>>>>>(84.b+120) string <20010615 (beta4-RC1)
+>>>>>>(84.b+120) string 20010615 (1.0 RC1)
+>>>>>>(84.b+120) string 20010813 (1.0 RC2)
+>>>>>>(84.b+120) string 20010816 (RC2 - Garf tuned v1)
+>>>>>>(84.b+120) string 20011014 (RC2 - Garf tuned v2)
+>>>>>>(84.b+120) string 20011217 (1.0 RC3)
+>>>>>>(84.b+120) string 20011231 (1.0 RC3)
+# Some pre-1.0 CVS snapshots still had "Xiphphorus"...
+>>>>>>(84.b+120) string >20011231 (pre-1.0 CVS)
+# For the 1.0 release, Xiphophorus is replaced by Xiph.Org
+>>>>(84.b+96) string/c Xiph.Org\ libVorbis\ I \b, created by: Xiph.Org libVorbis I
+>>>>>(84.b+117) string >00000000
+>>>>>>(84.b+117) string <20020717 (pre-1.0 CVS)
+>>>>>>(84.b+117) string 20020717 (1.0)
+>>>>>>(84.b+117) string 20030909 (1.0.1)
+>>>>>>(84.b+117) string 20040629 (1.1.0 RC1)
+>>>>>>(84.b+117) string 20050304 (1.1.2)
+>>>>>>(84.b+117) string 20070622 (1.2.0)
+>>>>>>(84.b+117) string 20090624 (1.2.2)
+>>>>>>(84.b+117) string 20090709 (1.2.3)
+>>>>>>(84.b+117) string 20100325 (1.3.1)
+>>>>>>(84.b+117) string 20101101 (1.3.2)
+>>>>>>(84.b+117) string 20120203 (1.3.3)
+>>>>>>(84.b+117) string 20140122 (1.3.4)
+>>>>>>(84.b+117) string 20150105 (1.3.5)
+
+# non-Vorbis content: Opus https://tools.ietf.org/html/rfc7845#section-5
+>>28 string OpusHead \b, Opus audio,
+!:mime audio/ogg
+>>>36 ubyte >0x0F UNKNOWN VERSION %u,
+>>>36 ubyte&0x0F !0 version 0.%u,
+>>>>46 ubyte >1
+>>>>>46 ubyte !255 unknown channel mapping family %u,
+>>>>>37 ubyte x %u channels
+>>>>46 ubyte 0
+>>>>>37 ubyte 1 mono
+>>>>>37 ubyte 2 stereo
+>>>>46 ubyte 1
+>>>>>37 ubyte 1 mono
+>>>>>37 ubyte 2 stereo
+>>>>>37 ubyte 3 linear surround
+>>>>>37 ubyte 4 quadraphonic
+>>>>>37 ubyte 5 5.0 surround
+>>>>>37 ubyte 6 5.1 surround
+>>>>>37 ubyte 7 6.1 surround
+>>>>>37 ubyte 8 7.1 surround
+>>>>40 lelong !0 \b, %u Hz (Input Sample Rate) \ No newline at end of file