Cast using Youtube app (DIAL/LoungeAPI)

[iBicha]

This is a proof of concept to investigate the feasibility of casting from the regular Youtube app (Android/iOS) to Playlet. It's doable, and has lots of value in removing friction with using the regular YouTube account/app.

• Implemented a DIAL server that listens for SSDP messages and responds with DIAL capabilities of the device
  • This is separate from Roku's built-in implementation
  • This avoid interfering with the official YouTube app and its DIAL identifier
  • Can customize device name on the cast dialog (e.g. we can show Playlet on ${DEVICE_NAME})
• Serve DIAL files describing the device and the app
• Lounge API integration (creating a session, etc)
• Bind with RPC endpoint, where we continuously listen for commands
• Link with TV code with UI implemented

Gotchas

• roUrlTransfer doesn't seem to do long polling / chunked transfer, so this needs to be done using raw sockets
  • Done, needs cleanup, error handling, etc
• There are a lot of commands to handle
• Some changes need to be done in the app (e.g the PlayQueue)
• The way it is implemented is by adding the loungeToken to the DIAL .xml file. The new way is apparently to have a "passiveSession". This way a lounge doesn't need to be created until the first device connects.
• Overall terrible code, needs to be cleaned up