I've just tested Rygel, but as I understand, Rygel is a server.

What I am looking for, is to choose the music on my computer (using Rhythmbox for example) and the file (or the stream ?) is send via upnp to a network player (Pioneer N-50 from my side).
Then the "sound" is played by the network player (connected to a hi-fi system).

This scheme is working fine with my android phone without any configuration. I can even chose the output of my phone player, or local, or network player.

I d like to be able to do the same from my Ubuntu desktop because the screen, the mousse... it's so comfortable.
Use desktop as DMC, network player as DMR.

Thanks a lot.