设备与音频路由接口

getDevices(kind?: DeviceKind): Promise<DeviceInfo[]>
cachedDevices(kind?: DeviceKind): DeviceInfo[]

startDeviceMonitoring(): void
stopDeviceMonitoring(): void

const delegate: SMeetingDelegate = {
  onDeviceAdd: (meeting, device: DeviceInfo) => {
    this.devices = meeting.cachedDevices();     // 建新数组再整体赋值
  },
  onDeviceRemove: (meeting, device: DeviceInfo) => {
    this.devices = meeting.cachedDevices();
  }
};

meeting.delegates.add(delegate);
meeting.startDeviceMonitoring();

// 页面退出
meeting.stopDeviceMonitoring();
meeting.delegates.remove(delegate);

switchCamera(cameraId?: string): void
switchCameraDevice(deviceId: string): void

const cams = await meeting.getDevices(DeviceKind.videoInput);
meeting.switchCameraDevice(cams[1].deviceId);

import { AudioRouteTarget } from 'srtc';

// 入会前：视频会议默认外放
meeting.defaultAudioRoute = AudioRouteTarget.speaker;

// 通话中用户点了听筒
meeting.setAudioRoute(AudioRouteTarget.earpiece);

// 撤销临时设置，回到持久设置
meeting.clearAudioRouteOverride();

AudioRoute        speaker / earpiece / bluetooth / wired / other   ← 只读，五态
AudioRouteTarget  speaker / earpiece                               ← 可切换，两态

setSpeakerOutputEnabled(enabled: boolean): void

onCallStateChange: (meeting, data) => {
  // data.state / data.previousState，类型 AudioCallState
}