feat: allow patching screenshare with video and audio devices

[ryanccn]

This is useful when loopback audio drivers or applications, such as BlackHole, are already installed.

[ryanccn]

@Vendicated I need some help here, currently using a video device errors with TypeError: Video was requested, but no video stream was provided. Testing seems to indicate that patching isn't successful? The overridden navigator.mediaDevices.getDisplayMedia never gets called.

[RinLovesYou]

Behavior on linux is rather unpredictable.

Starting a stream using camera

Initial result is this error, and no stream starting.

Afterwards, pressing the "Go Live" button will immediately start the stream using the previously selected camera. Window picker does not appear.

[OpaqueReptile]

Just switched over to Linux/Vesktop and was looking for a solution like this!

I had to move patchDisplayMedia() outside of the above if-else block to get this to work. Still fails initially, but the streaming button afterwards will then grab the camera every time.

[LuminaSapphira]

Doesn't allow picking video patch on wayland - the modal is entirely skipped since the selection is done with the desktop portal instead of in the app.

[Vendicated]

a lot has changed about the code since and now it has global state that it applies inside a getUserMedia patch. that'll likely solve your issues of only applying once! could you please rebase based on that?

[t1stm]

sorry for my useless comment, but this will make screen-sharing games on X11 finally bearable using my small tool (edit: i am talking as an NVIDIA proprietary driver user).

if the dev of this pr cannot currently / doesn't have the time to rebase it, would it be possible for me to do it?