How to use libid3tag to find offset to first mp3 header

tj <[email protected]> Mon, 28 Jun 2004 15:33:45 -0400
Newsgroups gmane.comp.audio.mad.user
Message-ID <[email protected]>
What call in libid3tag returns the offset to the mp3 header?
Plus, how the hell is that four byte sync safe length decoded?

tj