在跨设备投屏场景中，如何通过 AVSession 管理远程控制指令（播放/暂停/快进）？

let avSession: avSession.AVSession = await avSession.createAVSession(context, 'video', 'MySession');
let cmds: avSession.AVControlCommandType[] = ['play', 'pause', 'seek'];
avSession.activate(); // 激活会话
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// 使用分布式Data同步会话信息
let distributedData: distributedData.DataShareHelper = ...;
distributedData.put('currentSessionId', avSession.sessionId);
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// 从分布式数据中获取会话ID
let sessionId: string = distributedData.get('currentSessionId');

// 创建控制器并绑定到远程会话
let controller: avSession.AVSessionController = await avSession.createController(sessionId);
controller.registerControlCommandCallback('play', (command: avSession.AVControlCommand) => {
  handleRemotePlayCommand(command);
});
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// 用户点击播放按钮
buttonPlay.onClick(() => {
  avSession.setAVPlaybackState({ state: avSession.PlaybackState.PLAYING });
  controller.dispatchControlCommand({ command: 'play' });
});
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function handleRemotePlayCommand(command: avSession.AVControlCommand) {
  mediaPlayer.play();
  // 更新本地播放状态并同步回源设备
  avSession.setAVPlaybackState({ state: avSession.PlaybackState.PLAYING });
}
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// 发送端定期更新进度
setInterval(() => {
  let progress: number = mediaPlayer.getCurrentPosition();
  distributedObject.set('playbackProgress', progress);
}, 1000);

// 接收端监听进度变化
distributedObject.on('playbackProgress', (newVal: number) => {
  mediaPlayer.seekTo(newVal);
});
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network.on('connectivityChange', (data: { state: 'connected' | 'disconnected' }) => {
  if (data.state === 'connected') {
    controller.reconnect(); // 重新绑定会话
  }
});
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