Metadata extraction for MythTV recordings

[Former user]

What would it take to write a metadata extractor for MythTV recordings?

ie something that can call MythXML or the new Myth Services API

http://www.mythtv.org/wiki/GetProgramDetails_(MythXML) http://www.mythtv.org/wiki/DVR_Service#GetRecorded

I'd be happy to write these myself if provided an entry point.