At the risk of being a bit off topic … A lot of people interested in Airplay will be looking at this post wondering how to use AirPlay with UPnP or ChromeCast devices. shairport-sync [1] (used in the article) only works directly with audio hardware, so won't work with Chromecast or UPnP compatible systems. I've tried many many different open-source bridges and finally found AirConnect [2] which is by far the most reliable, active and well-maintained bridge. philippe44 responds to every issue filed (as far as I can tell). Works great with my Sonos PLAY:1 & XBox.

[1] https://github.com/mikebrady/shairport-sync [2] https://github.com/philippe44/AirConnect