2: Audience.
An audience member can only receive streams. If you set this user role in the channel, the SDK automatically
calls muteLocalAudioStream(true) and muteLocalVideoStream(true).
1: Host.
A host can both send and receive streams. If you set this user role in the channel, the SDK automatically
calls muteLocalAudioStream(false) and muteLocalVideoStream(false).
Client role in the
LiveBroadcastingprofile.