Plugin support on flatpak

[MaledictYtb]

Issue
When installing the flatpak version of mumble, there's no plugin installed by default.
I've tried to install them manually, but couldn't figure it out.
I've find two issues related :
mumble-voip/mumble#5993
mumble-voip/mumble#6523

This feature is really important, since mumble is used in a lot of video games for proximity chat.
It's also a big issue for immutable distro, which can only use the flatpak version of mumble.

Solution
The solution would be to implement plugins in the flatpak version.
I've read that it is not possible to use shared memory due to the flatpak sandbox, but maybe it is possible now ?

[jbruechert]

Do you know a simple to get game that I could test this with? I have never used this functionality, so I don't really know how it works.

Shared memory is at least not impossible to use in flatpak.

[jbruechert]

Can you try whether #123 works for you?

[Hartmnt]

AFAIK, allowing shared memory needs to be enabled "on both ends". So for a native game, that should be no problem. But I assume, if the games are to be played through Steam Flatpak for example, the user would need to enable shared memory for that, too. Which is not ideal from a security perspective. Especially since Steam Games are effectively arbitrary Code.

That being said, there is/was ongoing effort to move part of the overlay somewhere else such that it could be used in a sandboxed context: mumble-voip/mumble#5961 (See also the linked pull request for Steam Flatpak regarding discord)

Maybe something like this could be achieved for the plugins as well. But I am currently not deep enough into Flatpaks and positional audio plugins to give a final answer on that. We are definitely open for contributions that would make PA available for Mumble Flatpak.

[MaledictYtb]

I'm using PA in Minecraft using Mumble Link mod.
It works fine with your flatpak build #123 with default permisssions and minecraft running natively on the system (outside of flatpak)

With Minecraft in flatpak, it doesn't work by default. I need to add the Shared memory permission for Minecraft using Flatseal.
It seems to work fine but if I restart Minecraft, Mumble crashed with this error :
terminate called after throwing an instance of 'std::range_error' what(): wstring_convert::to_byte

[jbruechert]

In that case, I'll merge my PR.

[MaledictYtb]

Is there anything such as a debug mode so I can look more into why it's crashing with other flatpak apps ?