There is Airplay 1, which is the only widely supported protocol I'm aware of. See for example https://github.com/mikebrady/shairport-sync https://github.com/mik

There is Airplay 1, which is the only widely supported protocol I'm aware of. See for example https://github.com/mikebrady/shairport-sync https://github.com/mikebrady/shairport-sync. There is also DLNA, which is actually a standard. I think it's rarely supported for push audio streaming since the protocol is poorly specified.