pipewire-headless: This is an arch package that will drop in all the (many) configuration files that have to be modified to get pipewire working as a system service, disassociated from a session belonging to a logged-in user.
This will configure the system-wide pipewire the way I want it to work, which is:
- local ALSA fakery is set up so that any naive process opening ALSA for output will go to pipewire
- local pipewire socket in /run/pipewire is owned by pipewire:audio with mode 0660, such that any pw-cli process (etc) run in group 'audio' should work
- pipewire-pulse takes unrestricted commands from tcp port 4713 on all interfaces, such that 'pactl -s servername' (etc) from anywhere works
- pipewire has a RTP receiver listening on port 46000 on all interfaces
This should be a reasonable scheme for the use case that is "having a DSP on the LAN that can be used or controlled from anywhere on the LAN." You would not want to connect it to the internet.
If you want a slightly different configuration, have fun figuring out the dozens of configuration files, in a mishmash of lua and pidgin JSON, that pipewire scatters across no fewer than 9 directories (3 each for pipewire, pipewire-pulse, and wireplumber). Don't forget the 5 systemd units might have to be modified too!
After installing you will need to:
systemctl enable pipewiresystemctl enable pipewire-pulsesystemctl enable wireplumber
If you want everything showing up at the RTP receiver to come directly out the speakers, then somewhere you will have to also do this:
pw-link -Ilio # should see a bunch of thingspw-link 37 49 # patch thing 37 -> 49
2023-12-06 mikeyd