[vorbis] Ogg checksum thingie needed

[Martin Keienburg]

Björn Lindström wrote:
> I need some sort of utility to calculate a checksum of an Ogg file.
> 
> Two differently encoded Ogg:s should give different checksums, but the
> same file with different tags should give the same result.

What about these two projects, that aim to create checksums und 
bitprints for audio data and other files:

* Bitzi (http://www.bitzi.com) has a utility called bitcollider, which 
creates all sorts of checksums for a given file.  Among the checksums is 
one called bz:audio_sha1 which ignores non-audio parts of an audio file 
and seems to support Ogg Vorbis files

   Public CVS at http://cvs.sourceforge.net/viewcvs.py/bitcollider
   Sourcecode at http://bitzi.com/developer/code

* MusicBrainz (http://www.musicbrainz.org) uses the mbtagger utility, 
which creates an audio signature for audio files (including Ogg Vorbis 
files).
I have no idea how this exactly works, but part of the process uses TRM 
fingerprinting from relatable.com, which is closed source.

   Public CVS at http://cvs.musicbrainz.org/cvs/mb_tagger

Hope this is useful.

Martin

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