Add pipewire permissions

[viachaslavic]

Should fix #314

[flathubbot]

Started test build 172578

[RobLoach]

Related, do you think we should split up the host permission here? I'm open to any permissions to make it align with other flatpak standards.

[viachaslavic]

Yes, now we have the package compiled with the library and, as a result, pipewire available in the menu, but without permission to the system service, which is accessible via the socket.

host does not grant permission to the $XDG_RUNTIME_DIR. https://docs.flatpak.org/en/latest/sandbox-permissions.html#filesystem-access. There's probably a more universal solution without hardcoding the socket name, but I don't know. I've seen this trick in other projects like obs-studio.

[flathubbot]

Build 172578 successful
To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/155699/org.libretro.RetroArch.flatpakref

[viachaslavic]

Build 172578 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/155699/org.libretro.RetroArch.flatpakref

@zephyroths could you, please, test if this build solves the issue on your PC?

UPD: I can reproduce the issue on my VM with fedora 40. This PR solves it.

[zephyroths]

Build 172578 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/155699/org.libretro.RetroArch.flatpakref

@zephyroths could you, please, test if this build solves the issue on your PC?

UPD: I can reproduce the issue on my VM with fedora 40. This PR solves it.

it works. but when I played some games using pipewire another issue appears, the audio seems to be speed up. It didn't happen with different audio drivers.

[viachaslavic]

it works. but when I played some games using pipewire another issue appears, the audio seems to be speed up. It didn't happen with different audio drivers.

Thank you! Indeed, the implementation of the driver still needs to be improved. The speed up issue you've noticed likely affects all build types, not just flatpak.

Among the ones I've noticed are workarounds by changing additional options:

• If threaded video is enabled, then need to additionally enable Sync to Exact Content Framerate
• For the DOSBox-pure core enable Irregular latency in the Emulation core options.

[albertescanes]

Just a suggestion: I think the :ro option is enough to allow access to the PipeWire socket:
--filesystem=xdg-run/pipewire-0:ro

I've seen many other manifests with this option, and it seems to work.

[RobLoach]

Good to merge, then?

[viachaslavic]

Yup