66 lines
2.6 KiB
Plaintext
66 lines
2.6 KiB
Plaintext
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#------------------------------------------------------------------------------
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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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#
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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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# --- Ogg Framing ---
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0 string OggS Ogg data
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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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# --- 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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>>>>>44 lelong !-1
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>>>>>>44 lelong x >%lu
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>>>>>48 lelong !-1
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>>>>>>48 lelong x ~%lu
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>>>>>52 lelong !-1
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>>>>>>52 lelong x <%lu
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>>>>>48 string <\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff kbps
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# -- Second vorbis header packet - the comments
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>>>102 string \x03vorbis
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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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##>>>>113 string/c Xiphophorus\ libVorbis\ I \b, created by: Xiphophorus libVorbis I
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##>>>>>137 string >00000000 %.8s
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# Map to beta version numbers:
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##>>>>>>137 string <20000508 (<beta1 - prepublic)
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# The string has not changed from beta1 to 2 - they are indistinguishable.
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##>>>>>>137 string 20000508 (beta1/2)
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##>>>>>>137 string >20000508
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##>>>>>>>137 string <20001031 (beta2-3)
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##>>>>>>137 string 20001031 (beta3)
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##>>>>>>137 string >20001031
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##>>>>>>>137 string <20010225 (beta3-4)
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##>>>>>>137 string 20010225 (beta4)
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##>>>>>>137 string >20010225
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##>>>>>>>137 string <20010615 (beta4-RC1)
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##>>>>>>137 string 20010615 (RC1)
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##>>>>>>137 string >20010615 (>RC1)
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# Then come the comments, again length-counted (and number-counted).
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# Some looping constructs and registers would allow reading them but now
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# it's impossible. However we can print the number of comments present
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# (skipping by the vendor string length):
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##>>>>(109.l.113) lelong 0 \b, no comments
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##>>>>(109.l+113) lelong >0 \b, %lu comments
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