Parsing 3gpp2 files

[Mark Armour]

I am working on a parser for 3gpp2 files, and in particular I want to
learn how to parse the 'mdat' portion. I realize that almost all of
this raw data requires parsers for various codecs. What I want to be
able to do is separate the tracks so that I can determine whether I can
parse the individual compontents.

I have parsed the moov atom successfully, but I am not sure how to
proceed. Specs, books, etc. that I should acquire or read?

Thanks in advance.