Echo cancellation for calls with pipewire on Librem 5

Some technical details https://gitlab.com/mobian1/callaudiod/-/issues/13 @devrtz do you have an idea what needs to be done on trixie/pipewire? Seems to be fine on bookworm/pulseaudio.

Please review the text on https://opencollective.com/dephcom/projects/pipewire-echo?status=projectCreated

There is some work in progress for anyone who wants to try fixing it https://salsa.debian.org/Mobian-team/devices/librem5-tweaks/-/commits/wip/kop316/pipewire

Shared by Chris https://fosstodon.org/@kop316/114398582666998648

More technical details on what is needed https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/4170

A workaround would be to switch back to pulse audio until we can configure echo cancel in pipewire. We can refer to https://source.puri.sm/Librem5/librem5-base/-/commit/e55f39d8cb1137bfec68badec7da91fb88fc7a18 and it seems this is simpler in Trixie as it has a pipewire video only profile already. So we just need the systemd presets and allow pulseaudio as alternate dependency in mobian-base.

First step to switching to pulseaudio (sent MR) https://salsa.debian.org/Mobian-team/meta-mobian/-/merge_requests/21/diffs

Follow up https://salsa.debian.org/Mobian-team/devices/librem5-support/-/issues/9

So I'm able to successfully switch back to pulseaudio in mobian trixie and confirmed echo issue is fixed. But we will keep the bounty open for people who want to fix this in pipewire.

For those who want to try, can install mobian-base, librem5-support and librem5-tweaks packages from https://people.debian.org/~praveen/mobian/