OnRemoteVideoStateChangedType typedef Null safety

OnRemoteVideoStateChangedType = void Function(RemoteStreamKey streamKey, RemoteVideoState state, RemoteVideoStateChangedReason reason)

streamKey：远端视频流信息

state：远端视频流状态

reason：远端视频流状态改变原因

Implementation

typedef OnRemoteVideoStateChangedType = void Function(RemoteStreamKey streamKey,
    RemoteVideoState state, RemoteVideoStateChangedReason reason);