[vorbis] Obtaining tag-independent track uniqueness?

[Benjamin Flanders]

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Ben

<p><p>--- Ross Levis <ral at baycom.co.nz> wrote:
> This is an interesting question which I can't fully
> answer.
> 
> I presume this technique is used for MP3 files in
> some file sharing apps
> such as Morpheus & Audiogalaxy.  A similar routine
> will have to be
> developed for Ogg files.
> 
> Something like this will not be too difficult.  I
> think all that is
> needed is to omit all page headers and comments.  We
> would need to hear
> from the ogg file format experts out there to
> confirm this.  I doubt it
> is possible with existing library functions.
> 
> Regards,
> Ross Levis.
> 
> Tom Wadzinski wrote:
> > Hello:
> > 
> > As seen in some of the MP3-oriented P2P programs
> and audio organizing
> > tools, the underlying uniqueness of a given mp3
> file can be 
> > learned (for
> > the most part) by, for instance, taking a hash of
> the first 300,000
> > bytes of the non-id3 tag content of an mp3 file to
> obtain a content
> > signature (This hash could then further be paired
> with the 
> > length of the
> > non tag portion of the entire file for an even
> more unique signature).
> > This signature could then be stored in an
> organizer program 
> > DB (or in a
> > p2p system DB) such that even though the filenames
> and tag content can
> > change or be from different sources, the
> underlying audio 
> > content can be
> > tied back to a DB entry via the signature.  Note
> that this scheme is
> > understood to not work for identifying identical
> content encoded under
> > different bitrate/quality settings.
> > 
> > Can anyone guide me on whether or not there any
> way to accomplish the
> > same goal with Vorbis using the existing APIs,
> that is, getting at the
> > first x bytes of non-tagging/metadata content of a
> stream, and
> > similarly, getting the length of the
> non-tagging/metadata 
> > portion of an
> > entire file stream?  Or, if not that, any ideas on
> obtaining
> > "uniqueness" through another means in Vorbis?
> > 
> > One might say, "Why not just put a unique
> identifier in a tag in each
> > file, and not worry about this hash business?"  To
> 
> > preemptively respond
> > to this, arguments against this approach follow:
> > 1) The DB program (organizer or p2p system) might
> not have 
> > write access
> > to the files, and thus can't set an identifier
> tag.  For 
> > instance, users
> > with large collections (let's call large 20 -
> 30,000 files) are likely
> > to have a good portion of it set to read-only(not
> to mention read-only
> > media), for archival purposes.  Also, large
> collection 
> > holders probably
> > have a specific tagging/metadata program that they
> trust, and 
> > don't want
> > a program that they just downloaded deciding to
> write to every single
> > one of their content files.
> > 2) Files can't be checked for underlying audio
> content duplication,
> > other than through tagging / file size methods,
> which is generally
> > inadequate, due to different tagging/filename
> schemes.
> > 
> > Another might say, "How about decoding the first x
> seconds, 
> > and taking a
> > hash of that, to get uniqueness?".  This could
> work, except that
> > different decoder implementations/versions might
> produce different
> > hashes for the same file, and decoding is likely
> to be a much slower
> > technique.
> > 
> > Tom Wadzinski
> > 
> > 
> > --- >8 ----
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> > Ogg project homepage: http://www.xiph.org/ogg/
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