That is why 10 of the best screen mirroring apps for Android were reviewed to make it easier for you to choose. Hence, there are tons of applications developed for this purpose. In this modern era, many people are looking for better ways to play games or watch movies on a much broader and bigger screen to get the best experience possible. This is my understanding of how the chromecast device works and specifically the youtube app from looking at which is a python emulator that has youtube and google music working.Screen mirroring is getting attention from users all around the world. From here, I believe, communication for controlling the youtube app is not sent through the casting device but through the open tabs on the casting device and the emulator. All the emulating device needs to do now is open in a browser window. Will send a HTTP POST request containing a pairing key to //YouTube. Luckily for us the applications that the chromecast device uses are mostly web applications meaning our device emulator just needs to launch a web browser and point it to a specific url when it receives an application request.įor example the youtube app, after device discovery and establishing where the applications are located (part of DIAL). It is then the launched application that communicates with the casting device, I believe using the RAMP protocol. It is completely possible to emulate this protocol using some simple code to listen on the multicast group for discovery and then handle the HTTP requests to launch applications. The chromecast device works using the DIAL protocol. When I get chances, will write more here.
Overall, chromecast mirroring protocol is well designed, better than miracast, better than AirPlay mirroring (I have also implemented both of them, so I know what I am talking about). The next difficult part is the mirroring protocol, which is also very complicated, need to deal with packet splits, packet retransmissions. AppleTV does the same using FairPlay encryption. The most difficult part is device authentication, the sender and the receiver perform handshakes by exchanging keys and certificates in a way extremely difficult to crack. The discovery is mDNS, exactly same as Apple TV bonjour protocol.
Right now, only YouTube still uses the old protocol, which chromecast maintains its backward compatibility. The current Chromecast protocol is a completely different one from the original DIAL based protocol. I have implemented a complete chromecast v2 receiver, called YouMap ChromeCast Receiver, available in Google play store and Amazon store, xda-developer thread here:
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