[ubuntu] Airplay client?

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http://ubuntuforums.org – It seems my googlefu is failing me, I've been trying to get a better grasp on the possibilities to send sound from Ubuntu to my entertainment system using airplay. Whenever I google I get information on other ways to stream sound, or possibilities to set up a airplay target/server (something xbmc handles quite nicely), but my goal is to send audio/video from my desktop machine (ubuntu 12.04) to either my apple tv or my htpc running xbmc (on ubuntu). This works quite nicely from my ipad or my iphone. Since xbmc can utilize libshairport as good as it can I reason the protocol should be (Hardware)