Support for multiple devices in an airplayv2 road audio playing session

[JensTimmerman]

What feature would you like?

I would like to be able to do multiroom audio.

The use case is where someone has multiple airplayv2 capable devices in their network, being able to stream to multiple at the same time, as one would do on e.g. an iPhone, selecting 2 speakers in the airplay menu.

Describe the solution you'd like

implement a method to have an airplayv2 capable device that's not playing anything join another airplayv2 capable device and play the same audio, in sync.

Any other information to share?

This issue is created to follow up the information I got in #1059

also, when trying to read the faq that's linked in the CONTRIBTING.MD I got a 404 page: https://pyatv.readthedocs.io/en/master/faq.html

[JensTimmerman]

according to https://github.com/philippe44/libraop

It's possible to send synchronous audio to multiple players by using the NTP options (optionally combined with the wait option). Either get the NTP of the master machine from any application and then fork multiple instances of raop_play with that NTP and the same audio file, or use the -ntp option to get NTP to be written to a file and re-use that file when calling the instances of raop_play

[JensTimmerman]

according to mikebrady/shairport-sync#1407 ptp is preferred

[JensTimmerman]

https://github.com/hfujita/pulseaudio-raop2 is an implementation of this feature for PulseAudio

[JensTimmerman]

I'm interested in giving this a go, it seems like most timing and rtsp support is already in place, I noticed a lack of setpeers command, but that might even be optional? https://emanuelecozzi.net/docs/airplay2/rtsp/