Connect to DLNA/UPnP server and/or client?

[Slesa]

Are there already efforts to support DLNA/UPnP servers? I have a Raspberry Pi with a minidlna running, so it would a perfect match to connect both fruits.
I also have a Sonos system runnin, and I think they support the same protocol. So maybe they can be chosen as output devices, too.

What I have found so far is the vlc-qt library, so it should not be that hard to implement. Or maybe Platinum/Neptun can be an option.

But anyway, did someone else already start working on this?

[reezer]

Something like a built-in DLNA/UPnP server to make the collection available would be amazing.

[Slesa]

To act as a server seems to be not that complicated. All it seems to need is to reply to a udp broadcast message and deliver a XML file with all needed information.
I am currently trying out the other option and got connection to my speakers and the minidlna server with simple Qt methods. I am still struggling to understand the description fields, e.g. how to detect the speaker / server.