Snapcast VS AzuraCast

You could connect airplay to snapcast[0] then use an embedded snapcast player, like mine[1], I do this on an ESP32 with 320KiB of SRAM

[0]: https://github.com/badaix/snapcast

[1]: https://github.com/davidventura/esp-snapcast

I tried shairport some time ago, but settled on https://github.com/badaix/snapcast and have a really great and reliable open-source multi-room setup

I’ve had success with Snapcast when looking into this previously https://github.com/badaix/snapcast

https://github.com/badaix/snapcast!

Works perfectly on pis scattered around the house.

Snapcast: The cheapest and most modular option is deploying small form factor linux clients (raspberry pis, or any host all) with an audio interface (3.5mm, RCA, or otherwise), and connect the audio output interface to your choice of speaker. Snapcast is the open-source multi-room brains. It works well in my experience, but it is tricky to get setup properly to start with. Spotify Connect support is possible so you can launch your Spotify listening session from the Spotify app. Snapcast also integrates into Home Assistant for ease of adding/removing clients from the active listening sessions (yes, plural. You can have multiple listening sessions from multiple audio input sources at once).

- snapcast - this server/client software will broadcast synchronized audio from any source to any snapcast client. The server and clients can all run on the same computer. Individual clients are assigned to their own usb soundcard. Source and volume for each client is controlled through the webpage and/or homeassistant.

I have a music library on my home server that I use mopidy to play via the iris plugin integrated into my home assistant UI. It plays over Snapcast which streams over the network to multiple devices in the home with independent volume control. I can fire up the Snapcast client in my phone to get it going there as well, which does work over vpn if I'm away, though I generally just fire up the files from my phones SD card for out-of-home listening. I recently started using whipper on Linux to extract audio from craigslist cds.

https://mopidy.com/

https://mopidy.com/ext/iris/

https://github.com/badaix/snapcast

https://github.com/whipper-team/whipper

You want SnapCast. You'd run snapserver on your Linux box and snapclient on your Pi's. Snapserver has support for Airplay (via shairport-sync) and Spotify (via librespot). I recommend using MPD for your music library, as I don't think PlexAmp can output audio in a way that's useful for snapserver.

Instead of splitting audio from the jack output you can create a Little network with a router and have more rpi streaming music over It using snapcastsnapcast .

If you're into the idea of an open-source client/server architecture, then there's Snapcast. If you have a few Raspberry Pis (one per output source) or any other box that can run Linux and has an audio out interface, then this is cheap and easy with an active Home Assistant integration too.

I don't have any experience with it, but it looks like AzuraCast does what you want.

I've used AzureCast - https://www.azuracast.com/ - super simple to stand up and run - you can run multiple radio stations with it.

It’s also worth looking into RadioDj or Azuracast for solid, less complex alternatives. I might be switching back to RadioDj since it’s a tad bit easier to queue up songs.

Okay yeah so this is all wrong. I'm using this as reference for an example docker compose file.

Take a look at AzuraCast. This seems very suited to your need

Azuracast perhaps?

Azuracast. Not quite as powerful but much easier to run. Also Linux, although you can tinker to get it running under Windows. It would run well in a cloud host like Linode or Digital Ocean, which might mean you don’t need a relay service like Alon depending on how many listeners you have. You can also host it at home of course.