CloudWebRTC

I am trying to investigate the packaging difficulty of several core modules, we need to try to depend on as few CPP modules as possible.

This feature has not yet been implemented, maybe someone can submit a PR xD.

Depend on this PR to land first. https://github.com/flutter/engine/pull/20714

https://github.com/flutter-webrtc/flutter-webrtc/pull/740 I have tried to port this plug-in on Linux, but because the flutter Linux platform cannot reuse the CPP code of the windows platform, I have to completely rewrite...

Linux platform must use GTK's GObject style to wrap the plugin, not C++，so ...

Hey @iDings, Is the loopback sample working? It looks like the RTCVideoRenderer is not initialized.

@iDings Are you still interested in continuing your PR? I'm trying to write a generic layer to adapt to linux/windows/ and e-linux differences.

@cnwangxiao I think this is a valid fix, can you submit a PR for the fix you made?

Embedded Linux can use v4l2, pulse, alsa, and the google webrtc library is supported, just need to cross-compile this library https://github.com/webrtc-sdk/libwebrtc

@seanchann I've added arm/arm64 binaries in subsequent commits