Hallo!
I'm sure you could do this entirely with Python, which would suit Trac. Not that I'd have a clue where to start, well not much of one anyway.
You could use Plone, which already has many communication-tools, and write an additional product in python for it ... (where you could in example use pd or anything else and stream with an icecast2 server ...) a little howto you can make something (Plone and communication with pd ...) is here: http://pdradio.iem.at/howto
(of course not that advanced as you want it ... ;) LG Georg
