媒体控制

await meeting.requestOpenMic();      // 开麦（建轨道 + 采集 + 发布）
meeting.setMicMuted(true);           // 静音（轨道还在）
await meeting.closeMic();            // 关麦（销毁轨道）

// ❌ 不好：点了才知道不能点
try {
  await meeting.requestOpenMic();
} catch (e) {
  toast('主持人已开启全体静音');
}

// ✅ 好：按房间状态提前禁用按钮
const room = meeting.getRoomInfo();
const canUnmute = room !== undefined &&
  (!room.micDisabled || !room.selfUnmuteMicDisabled);

onAdminRequestOpenMic: (m, data) => {
  // data.opUid 是发起请求的主持人
  this.showConfirmDialog('主持人请你开麦', async () => {
    await m.requestOpenMic(undefined, true, data.opUid);
  });
}

const cam = await meeting.requestOpenCamera(cameraPreset720p());
await meeting.closeCamera();
meeting.switchCamera();                       // 前后置
meeting.switchCameraDevice(deviceId);         // 指定设备

if (this.meeting.cameraTrack !== undefined) {
  SRTCVideoView({
    track: this.meeting.cameraTrack,
    trackKey: this.meeting.cameraTrack.id
  }).width('100%').height(240)
}

onUserCameraStateChange: async (m, data) => {
  if (data.cameraState === CameraState.on) {
    await m.subscribeRemoteVideoTrack(data.uid, TrackDesc.cameraSmall);
  } else {
    await m.unsubscribeRemoteVideoTrack(data.uid, TrackDesc.cameraSmall, 300);
  }
}

meeting.toggleRemoteAudioMute(true);          // 关扬声器（全体，只停播放）
meeting.toggleUserAudioMute(uid, true);       // 本地静音某人（只停播放）
await meeting.unsubscribeRemoteAudioTrack(uid);  // 真退订（省带宽）

await meeting.requestShare();          // 弹系统授权窗
await meeting.stopShare();

onRoomShareStart: async (m, data) => {
  await m.subscribeRemoteVideoTrack(data.uid, TrackDesc.screen);
},
onRoomShareStop: async (m, data) => {
  await m.unsubscribeRemoteVideoTrack(data.uid, TrackDesc.screen, 0);
}

await meeting.closeCamera();
await meeting.closeMic();
await meeting.stopShare();
await meeting.exitRoom();