(Feel free to join in over at in #awkwardtv.) This reply should, however, give you a taste of what's to come. There's obviously a lot left to do in the reverse engineering department. Off-device requests like those from YouTube have non-local URLs, such as from v7. This is what a typical on-device play request looks like. Play is, in particular, interesting for the Mac application-to-AppleTV component of the puzzle. Other commands seem to include stop, photo, volume, rate, play, authorize, and event. The scrub command is another valid request that I stumbled over. Send the bolded text over requesting the reverse HTTP connection and you'll receive a confirmation back from the system.
AIRPLAY FOR MAC 2010 TV
Telnet over to your Apple TV and connect via port 7000. If you want to get a wee little peek at what's going on with AirPlay, you can do so via your command-line Terminal application. Once that's figured out, you could theoretically be able to stream from any app on a Mac to your Apple TV or from your handheld iDevice to a Macintosh. There are a bunch of technical details that I haven't yet figured out, such as the TXT record that accompanies the Bonjour service, and how the handshaking takes place, and what authentication is required, and so forth. Unfortunately, I've barely scratched the surface of how this works. It's a pretty cool way of going about things. Instead of requesting data from the Apple TV, the Apple TV takes control and it starts requesting information (like what file to play) from the iPhone or iPad or whatever. Once it finds one, it opens a connection to that system and then reverses the normal interaction style. In practical terms it means this: your AirPlay-ready device (or iTunes running on your Mac or PC) searches for playback systems like Apple TV, Airport Express or stereo systems supporting AirPlay. The client becomes the host and the host becomes the client.
I've poked around under the covers and have discovered that AirPlay is built using a reverse-HTTP protocol, which allows a client to connect to a host and then flip the way that the connection (called a "socket") works. The problem lies in reverse engineering the service. AirPlay is basically a standard Bonjour service that advertises itself and accepts playback requests through simple URLs. There's no reason that the Mac cannot accept and play an AirPlay video or photo stream, other than that Apple has yet to get around to implementing it and there aren't yet third-party 'catcher' apps available.
AIRPLAY FOR MAC 2010 MAC OS
Have you heard any rumblings that accepting an AirPlay stream could come to Mac OS X? It seems strange that the mini (that costs 7x more) lacks this functionality. But I realized that a great feature of AppleTV is the AirPlay functionality. Do you think a Mac will be able to accept an AirPlay feed in the future? Here's why I ask - I'm considering getting a Mac mini for my home theater.
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