Taglib

zzd10h : 
I have compiled this library to port another program, qTagger, a Qt MP3 tag
editor.

http://taglib.github.io/

TagLib is a library for reading and editing the meta-data of several popular
audio formats. Currently it supports both ID3v1 and ID3v2 for MP3 files, Ogg
Vorbis comments and ID3 tags and Vorbis comments in FLAC, MPC, Speex, WavPack
TrueAudio, WAV, AIFF, MP4 and ASF files.

TagLib is distributed under the GNU Lesser General Public License (LGPL) and
Mozilla Public License (MPL). Essentially that means that it may be used in
proprietary applications, but if changes are made to TagLib they must be
contributed back to the project. Please review the licenses if you are
considering using TagLib in your project.

There is some general information about the motivation and workings of TagLib
that can be found in the API documentation.

Contact:
Please, for all questions related to TagLib and / or patches use the development
list. Bugs should be reported at the GitHub bug tracker.

Goals and Features:
TagLib is fast - tests have shown it to be about 6 times faster than id3lib and
3 times faster than libvorbisfile at reading tags (CPU time)
TagLib is clean - TagLib is written in clean, object oriented C++ using a
programming style common in KDE and Qt library programming
TagLib is easy - TagLib offers an abstraction layer that makes it easy to ignore
the differences between the different file formats and their implementations
TagLib is powerful - for those that want to look under the hood TagLib provides
access to the implementations of the individual file formats and provides a
toolkit for doing advance manipulation of audio meta-data
TagLib is well documented - Every class, namespace, function and enumeration in
TagLib is documented
TagLib supports Unicode - both ID3v2 and Ogg Vorbis standards are designed to
support Unicode, so is TagLib (many tagging libraries and frontends are not)
TagLib is extensible - TagLib does not implement every feature of ID3v2, but
does instead make it possible for application authors to extend TagLib to
support the specific features that they need in their applications
TagLib is not toolkit specific - while TagLib does use KDE-style programming
conventions and C++ by default, it does not link to either Qt or Glib (in fact
it has no external dependancies) and does provide Glib-style C bindings
(currently for the generic API only)