Glyr is a search engine for music related metadata

The finest search you can buy for no money ^TM

[screenshot]

It comes both in a command-line interface tool and as a C library, both with an easy to use interface.
The sort of metadata glyr is searching (and downloading) is usually the data you see in your musicplayer.
And indeed, originally it was written to serve as internally library for a musicplayer, but has been extended to
work as a standalone program which is able to download:

Getter	Description
cover	Coverart (front images supported only)
lyrics	Songtext
artistphotos	Photos of a certain band (press or live)
artistbio	Artist biography from various sites
review	album reviews from various sites
albumlist	A list of albums from a specific artist.
tags	Tags, either related to artist, album or title
relations	links to wikipedia, myspace, musicbrainz ...
similarartists	similar artists
similarsongs	similar songs
tracklist	tracklists of an album
guitartabs	guitartabs in textual form
backdrops	Large artist photos, suitable for backgrounds

Terminology:
To prevent disambiguation the following terms are used below:
* glyrc is the command-line interface to libglyr.
* libglyr is the library behind, which may be used by your program.
* a getter is a type of metadata to download, e.g. cover, sometimes also called fetcher
* a provider is a source libglyr queries in order to find the data.
* glyros is the ruby wrapper for this lib. Currently it is not maintained.

FEATURES

Many built-in providers (46 at time of writing, ~30 distinct sites), high success-rate (the longer the search, the higher the risk :))
Portable: Windows and Linux are supported (Developement on Linux) see _¹ for Mac OSX,
Fuzzy matching: Search providers with Levenshtein algorithm to eliminate typos and enhance search results.
Decent Unicode support: All sort of valid UTF8 is taken, and UTf8 output can be forced.
Fast Download: libcurl is used internally, and sources are searched in parallel, unneeded data is not downloaded if possible.
Lightweight dependencies: libcurl, glib and sqlite (for caching) - typical linux systems have those installed.
Download of a user defined amount of items, glyrc cover -a Foo -b Bar -n 30 tries to load 30 covers of album 'Bar' by artist 'Foo'.
Grouped download: Query providers by descending Accuray / Speed; controllable by the user over the qsratio
Optional download of images, URL is returned otherwise - so it can act a bit like a search-engine.
Free Software licensed under the terms of the GPLv3
libglyr is portable, easy, threadsafe and lowlevel enough for everyone.
...lots of other options like min/max size for images.
A built-in cache to store the metadata (using SQLite)

GETTING STARTED

Compiling

See the compile page.

libglyr:

See the examples in src/examples for a quickstart.
There's also a more gentle (and brief) introduction.
Also see the API Reference
Please note: Since version 1.0.0 the API will be stable, and will only be open for extensions.

glyrc:

Please refer to glyrc -h which gives you a brief introduction to the arguments you can pass,
See the wiki for more detailed information about the options.

FAQ

Anyone using it already?

Glyr.. such a silly name! Why?

Indeed. Should have named it 'Glyros' (too late, damnit).

Is it hard to write something with it?

Some knowledge of C might be required, but the code is straight forward most of the time.

Bash scripts are pretty straight-forward:
glyrc cover --artist Equilibrium --album Sagas --write '/tmp/:artist:_:album:.:format:' --callback 'sxiv ":path:"'

Additionally there are bindings to Python and Ruby:

plyr by me (complete API).
ruby-glyr by meh (complete API).

How..how am I supposed to use it?

Well, as normal user you could use glyrc to retrieve some metadata in a batchlike fashion.
As developers you have lots of option, you could write glyr-plugins for musicplayers (gmpc!), set up a webserver with this,
hack up little scripts showing covers on the desktop.. everything related to musicmetadat is possible here.
You could also extend libglyr itself but that's a little harder.

Isn't there musicbrainz already?

The kind of metadata downloaded by glyr differs heavily from musicbrainz.
i.e. glyr finds metadata for musicplayers while musicbrainz finds data for CD Rippers and taggers.
Musicbrainz runs remotely on some server and uses a large database which is searched through lucene.
Glyr is a client program which hops over several sites and does not cache anything, unless you do it yourself.
You could of course let glyr run on a (remote) server, and cache all results to do something similiar.
There is coverarchive.org , but it does not seem to fully work yet. But it will be accessible once it does.

AUTHOR

See the AUTHORS file that comes in glyr's distribution.
See also COPYING to know about your rights.

I CAN HAZ HELP?

BUGS

If you found one: Meh. Sorry for that.
If you file a bugreport: Hey, thank you!

Use the Issue Tracker to share your find.
Alternatively you may drop me a mail at

PATCHES

If you hacked one: Excellent! Send it to me via mail or see below.
If you want to add new providers you should look at the existing provider plugins to get an idea how to write one.
Starting with lib/cover/lastfm.c isn't a bad idea either, because it is one of the very simple ones.

Take the usual Git(Hub) approach:
# Fork this project
# Make your changes
# Make a Pull request

If you're not familiar with git, or just don't like it,
you can also send me the patch via mail:

Thanks for any help in advance!

WRITE SOFTWARE THAT USES GLYR

May sound strange, but you're giving me a reason to maintain it, write new providers etc.
Also bugreports (well, there are no bugs, just in case) are appreciated, or just questions.
Those help to make the documentation more clear.

DONATE

You also might consider a small (CS-Students are already motivated by 1 Cent ) donation if you use feel like it:
(For now only possible via Flattr or Paypal , you gonna need an account there - Sorry)

DISCLAIMER

As usual, no warranty is granted that this software works like expected.
Refer to the GPLv3 copy you got with libglyr. It is here.
Glyr is just a way to find the data, it does not own any rights on the data it found.

All retrieved items are copyrighted by their respective copyright owners.

Refer to the provider's terms of use. Every item you get from libglyr contains the name and a url to the provider, so lookup there terms of use there.

[1] Glyr has not been tested on Mac OSX yet. If you own a Mac, any help with 'porting' glyr is highly appreciated. My guess would be that no to almost no changes need to be done though.