I have Raspberry Pi 3.
I would like to setup an audio multicast server on the Raspberry Pi (i.e.
I would like the rendezvous point to be on the Raspberry Pi).
How can I achieve that?
If you want to multicast audio streams to or from the Pi, or indeed handle multiple network audio streams generally in Linux, I suggest you have a look at PulseAudio, which supports receiving and broadcasting multicast RTP audio streams:
See module-rtp-send and module-rtp-rcv