Suppport ScreenCaptureKit loopback

[thewh1teagle]

In recent versions of macOS there's new API called screen capture kit which provides a way to capture the screen content (Audio / Video),
That way we can receive audio from the speakers, similar how cpal does that with WSAPI on Windows (Added in #251)
As starting point we can follow the approach used in the project scap in engine/mac/mod.rs they capture audio / video using screen capture kit

[LatentDream]

+1

[rustdesk]

+1

[Kree0]

Hello, I'm interested in this issue. But it seems that ScreenCaptureKit works differently. ScreenCaptureKit capture audio through Display/Windows/Application instead of the Device, I don't know how to make it fit the crate.

[rustdesk]

Maybe, you can add a virtual device called loopback, which use screencapturekit, the others keep no change

[louis030195]

+1

[SuperKenVery]

ScreenCaptureKit has a relatively high latency, in my previous experience. Maybe we could have a look at CoreAudio Tap API

Example usage

[SuperKenVery]

Hey guys I implemented loopback recording on macOS with CoreAudio Tap API.

Here's my pr: #1003