philippe44/AirConnect ? reverse-engineered prompt

Build me a simple audio bridge that makes my Chromecast, Sonos, and other UPnP speakers show up as AirPlay devices on my network.

I want to be able to run it on a small machine like a Raspberry Pi or a computer on the same Wi Fi, then see my speakers from iPhone, iPad, Mac, or iTunes and stream music to them. It should support discovering devices automatically, naming the virtual AirPlay speakers clearly, and handling audio playback reliably. If possible, let me choose whether the audio is sent as is or re encoded to something like mp3 or aac so metadata works better. It should also be possible to run it in the background, with a basic config file for things like latency, ports, and device settings. If you need to, look up the current build and run instructions online and make sure it works on common desktop and Linux systems.