CloudWebRTC

@ollydixon Yes, all platforms can choose the output device, iOS can switch the output device between the preferred device and the speaker if a wired or Bluetooth headset is connected....

This should be related to the H264 HW encoder's height and width 16 alignment, I'll investigate how to fix it

这属于camera控制，不属于webrtc 提供接口范畴哦。

This PR fixes audio outputs device enumeration on macOS/Windows/Android. https://github.com/flutter-webrtc/flutter-webrtc/pull/1030

@BFamzz Not yet implemented on iOS https://github.com/webrtc-sdk/webrtc/blob/m104_release/sdk/objc/native/src/audio/audio_device_ios.mm#L1204

@hieplee2997 this issue is dependent on this PR, so, I think will be resolved soon. https://github.com/webrtc-sdk/webrtc/pull/21

related issue https://github.com/flutter-webrtc/webrtc-interface/issues/3 here.

Repair steps: 1,update the `webrtc-interface`, add `nullable` property to track 2,update `dart-webrtc` and `flutter-webrtc` (verified for each platform)

Please try the last commit

这属于实际业务开发，需要您自己实现，flutter-webrtc-demo/server 仅用于展示插件基本用法。