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On Sunday, 26. September 2010 15:46:25 Stefan Derkits wrote:
> Hey,
> it would be cool to combine the Efforts and think about how to best
> implement Audio Fingerprinting and automatic "guessing" of Tags (be it
> from last.fm or be it from MusicBrainz, the more the merrier ... or?? :) =
).
>=20

I'd rather recommend against two seperate solutions here. Especially if we=
=20
want to use fingerprints in the Collection. Could get quite some mix up. I=
=20
discussed the musicbrainz vs. liblast.fm stuff in IRC before starting the w=
ork=20
on the last.fm fingerprinting. As far as I can tell most people agreed that=
 it=20
should be last.fm and that using phonon to get the audio data would be the=
=20
only way to ensure that EVERY kind of audio we can play can also be=20
fingerprinted (technically this way you could even fingerprint streams to g=
et=20
the data / tags of the current song). I'm not sure how all the other devs=20
think about this though.

> Sergey, your Code generates the Fingerprints on Demand ... I don't know
> how Daniels Implementation with liblastfm does it ... but wouldn't it be
> better to integrate the Fingerprinting Functionality into the Collection
> Scanner and automatically generate a Fingerprint for all Files and save
> them in the Database?

The problem with phonon is that (at the moment?) it doesn't push the audio=
=20
data faster if only an audioDataOutput is connected. So basically you get t=
he=20
fingerprint in a very slow time (liblast.fm needs only some seconds of audi=
o=20
to generate a fingerprint.. but phonon has to "play" the song in normal=20
speed). For the collection scanner this is (at the moment) not practically.

> Because as long as the Audio in the File doesn't change (which rarely
> happens for Audio Files :) ) the Fingerprint is the same.
>=20
> Also my Idea would be to see an Audio Fingerprint as a Tool to Manage
> your Collection and not only to get Tags.
> 2 Examples of Managing Functionality I have in my Mind:
> -) check if the exactly same Song exists more then 1 Time in your
> Library (so that a User could decide to delete the Duplicates)
> -) check for Songs that have Errors (no Idea if Fingerprinting is up to
> that, should play around with it a little bit more :) )

My whole code was build around this Idea. Because of this I made a library =
out=20
of the last.fm fingerprinting code so that every part of amarok can easily =
use=20
it. The tag guessing part from my code is just meant to be ONE of many use=
=20
caeses. There is a (rather old) merge request in gitorious from my code if =
you=20
want to have a look (http://gitorious.org/amarok/amarok/merge_requests/152).

>=20
> Just some Ideas, also I'm offering my help to think about the Use Cases
> of Fingerprinting and trying to design the User Interface and additional
> Features.
>=20
> Stefan

Daniel

>=20
> > Hi,
> >=20
> > Sorry to get into this discussion so late. I was in Switzerland ;o).
> > LibLastfm Fingerprinting support using phonon as audio source was
> > already implemented by me and works 50% of the time with xine backend
> > (the other 50% it crashes). The crashing most definitely comes from xine
> > which is somewhat unstable if used with multiple threads as far as I can
> > tell. Otherwise my implementation works just fine. The VLC Backend is
> > not yet up to the task (no working audioDataOutput as of yet). As soon
> > as it is and I can get it stable in most used Backends it will be
> > pushed.
> >=20
> > Greetz
> >=20
> > Daniel
> >=20
> >=20
> >=20
> > _______________________________________________
> > Amarok-devel mailing list
> > Amarok-devel@kde.org
> > https://mail.kde.org/mailman/listinfo/amarok-devel
>=20
> _______________________________________________
> Amarok-devel mailing list
> Amarok-devel@kde.org
> https://mail.kde.org/mailman/listinfo/amarok-devel

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