I guess what you are saying would make for prettier XLobby screens as opposed to just loading WiRNS or DVA in the XL browser functionality. Like you I'm not a code jockey, so I have focused on integrating those existing solutions.
As the two main televisions in my place have Replays attached to them I can cut out the "streaming through htpc" part of the equation. Even though an HTPC would improve the reliability of streaming the pc-stored mpegs; I just needed a way to control the DVRs and the DVA or WiRNS software via their built in web pages.
Maybe in a ReplayTv forum you can ask what web commands do what?
If there is anyone that can reverse engineer or figure out source code there's code around. For example I found the following on the Poopli Forum.
On a computer connected to the same network as your replay, open a browser and go to the following URL:
http://<replay's ip>/screenshot.bmp?sync=1
and you'll see the current screenshot in your browser.
Also checkout the perl script stuff used by webmote:
http://s95184944.onlinehome.us/ReplayTV.html
For people who can read code:
Remote Commander (
http://rtvrc.sourceforge.net/) ...
Either way please share what you end up doing.
Manny