hi
you can try it with
Audioengine3
AudioGenie is a fast Library with many functions to analyze audiofiles (like Bitrate, Samplerate, Frames, Duration, Version-Number, etc) and for tagging. This
DLL can read and modify audio tags like id3v1, id3v2, ape, lyrics and mp4, ogg,flac & more.
and it is free / open source! der code ist in c++
hier gibt es noch etwas dazu
http://www.3delite.hu/