属性
onTrackAdded
onTrackAdded:(newTrack: ITrackInfo, sessionId?: IPlayerSessionId) => void
添加新轨道时调用。当从服务组件调用IPlayerServer.addTrack API时，会收到此回调。
onTrackRemoved
onTrackRemoved:(removedTrack: ITrackInfo, sessionId?: IPlayerSessionId) => void
当移除现有轨道时调用。当从服务组件调用IPlayerServer.removeTrack API时，会收到此回调。
