PipeWire support in Qubes Video Companion’s sender

[DemiMarie]

How to file a helpful issue

The problem you're addressing (if any)

Qubes Video Companion’s camera sender code uses v4l2 directly, which has two limitations:

1. It does not work at all for MIPI cameras, which require userspace image processing that can only be done by libcamera or proprietary software.
2. It requires exclusive access to the device.

This is also a prerequisite for screensharing with Wayland.

The solution you'd like

Use PipeWire for capture instead.

The value to a user, and who that user might be

Users will be able to use MIPI cameras. Sending video from the same camera to multiple qubes at the same time will work.

Completion criteria checklist

(This section is for developer use only. Please do not modify it.)

[marmarek]

Isn't #9713 effectively a duplicate of this issue?

[DemiMarie]

PipeWire support will unblock both #9713 and screensharing on Wayland. #9713 also requires figuring out how to make MIPI cameras work in Qubes OS, which is itself non-trivial.