Re: FreeDB Search

On Sat, Jul 05, 2014 at 12:03:53PM +0530, Abhinav Jangda wrote:
> Hello all,
>
> I am working on "Add MusicBrainz Support to EasyTAG" in GSoC 2014. I have to replace the current CDDB code with new MusicBrainz code. In CDDB code there is a feature through which you can generate a discid and then search over the FreeDB or CDDB data base using there portal. I have a few tracks selected and generate the FreeDB DiscID and a query string which will be used to search over the FreeDB server.
> I am using MusicBrainz FreeDB Gateway and search with the following query, here DiscID is 24028103:
>
> http://freedb.musicbrainz.org//~cddb/cddb.cgi?cmd=cddb+query+24028103+3+150+17850+34875+641&hello=noname+localhost+EasyTAG+2.2.1&proto=6%20HTTP/1.1
>
> I get 211 results.

You get a 211 *code*, i.e., inexact matches. I only see 39 results.
Still more than below, as I'll explain there.

>
> Now if I use WebInterface of MusicBrainz, i.e. the following URL:
>
> http://musicbrainz.org/ws/2/freedb?query=discid:24028103
>

This is searching freedb itself -- not, as the musicbrainz freedb
gateway, searching the musicbrainz data using a freedb-like protocol.

> I got just one result.
>

This is because freedb only has one result: try the same discid on
http://www.freedb.org/freedb_discid_check.php

The /ws/2/freedb search endpoint only searches actual freedb data, not
musicbrainz's data at all, so that's not in fact using musicbrainz,
except for our search indexes :)

> Can anyone please help me and tell me how can I use WebInterface of MusicBrainz for FreeDB search?
>

If you'd like to use musicbrainz properly with disc-based IDs, you'll
want to use MusicBrainz DiscIDs, rather than FreeDB ones. There's a
variety of tools that will generate them, perhaps most notably and
usefully libdiscid: https://musicbrainz.org/doc/libdiscid -- there are
also bindings to libdiscid in a variety of languages, depending on what
EasyTAG's codebase is written in.

MusicBrainz DiscIDs look like I5l9cCSFccLKFEKS.7wqSZAorPU- -- that is,
28 characters that are base-64 encoded. I'd recommend using a binding
such as libdiscid, but if you're curious about the details of DiscID
calculation, they're available from
https://musicbrainz.org/doc/Disc_ID_Calculation. MusicBrainz DiscIDs
also include more information than a CDDB one, and throw away less, thus
resulting in a better matching.

DiscIDs can then be looked up using the /ws/2/discid endpoint, e.g.
http://musicbrainz.org/ws/2/discid/I5l9cCSFccLKFEKS.7wqSZAorPU-. Please
also look at the documentation for that endpoint, at
http://musicbrainz.org/doc/Development/XML_Web_Service/Version_2#discid,
since there are details about the inclusion of CDStubs (you may or may
not want to include them -- they're included by default) and the ability
to provide a 'toc' parameter, which allows for fuzzy lookup (which is
almost certainly desirable -- the FreeDB gateway uses a similar fuzzy
lookup to produce the results you saw there).

If you'd like to go a step further than only CD/DiscID based matching,
integration of AcoustID (https://acoustid.org/) or metadata-based
lookups via the rest of our web service, as documented for the current
version at
http://musicbrainz.org/doc/Development/XML_Web_Service/Version_2 -- but
I don't know the exact details of your GSoC project, of course :)

Good luck!

> Thank You,
> Abhinav
>

> _______________________________________________
> MusicBrainz-devel mailing list
> [email protected]
> http://lists.musicbrainz.org/mailman/listinfo/musicbrainz-devel

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