javascript - 无法在 chime sdk 单一 js 中集成语音焦点

Question

我正在尝试根据以下给出的文档在我们的 chime sdk singlejs 演示中集成语音焦点功能：https ://aws.github.io/amazon-chime-sdk-js/modules/amazonvoice_focus.html 。

但是，尽管尽了最大努力，isVoiceFocusSupported 仍然显示错误。代码如下所示，供您参考

 (async () => {
            const logger = new ChimeSDK.ConsoleLogger('MyLogger', ChimeSDK.LogLevel.INFO);
            let transformer;
let isVoiceFocusSupported;

try {
  const transformer = new VoiceFocusDeviceTransformer.create({}, { logger });
  isVoiceFocusSupported = transformer.isSupported();
  } catch (e) {
  // Will only occur due to invalid input or transient errors (e.g., network).
  isVoiceFocusSupported = false;
  alert (isVoiceFocusSupported);
}
            
            const deviceController = new ChimeSDK.DefaultDeviceController(logger);
            
            const meetingResponse = {"Meeting":<?php if ($_GET ['met1']) echo $_SESSION ['met1'];else echo $_SESSION ['met']; ?>};
            const attendeeResponse = {"Attendee":<?php echo json_encode($attendee) ?>};

            const configuration = new ChimeSDK.MeetingSessionConfiguration(meetingResponse, attendeeResponse);
            const meetingSession = new ChimeSDK.DefaultMeetingSession(configuration, logger, deviceController);

            const audioInputDevices = await meetingSession.audioVideo.listAudioInputDevices();
            const audioOutputDevices = await meetingSession.audioVideo.listAudioOutputDevices();
            const videoInputDevices = await meetingSession.audioVideo.listVideoInputDevices();

            meetingSession.audioVideo.chooseVideoInputQuality(960,540,15,1400);
            
            await meetingSession.audioVideo.chooseVideoInputDevice(videoInputDevices[0].deviceId);
            await meetingSession.audioVideo.chooseAudioInputDevice(audioInputDevices[0].deviceId);
            if (audioOutputDevices[0]) {
                await meetingSession.audioVideo.chooseAudioOutputDevice(audioOutputDevices[0].deviceId);
            }
            meetingSession.audioVideo.startVideoPreviewForVideoInput(document.getElementById('self-video'));



            const audioElement = document.getElementById('audio-preview');
            meetingSession.audioVideo.bindAudioElement(audioElement);

            const videoElement = document.getElementById('video-prime');
            const videoElement1 = document.getElementById('video-preview1');

            

            const observer = {
                audioVideoDidStart: () => {
                    console.log('Started');
                },
                videoTileDidUpdate: tileState => {
                    if (!tileState.boundAttendeeId || tileState.localTile || tileState.isContent) {
                           
                        return;
                        
                    }
                    //console.log('Start video');
                    
    const videoElement = document.getElementById('video-prime');
   const videoElement1 = document.getElementById('video-preview1');
   const videoElement2 = document.getElementById('video-preview2');
   
   const tiles = meetingSession.audioVideo.getAllVideoTiles();

tiles.forEach(tile => {
    let tileId = tile.tileState.tileId;
    
    if (tileId=="2") { meetingSession.audioVideo.bindVideoElement(tileId, videoElement);}
    if (tileId=="3") { meetingSession.audioVideo.bindVideoElement(tileId, videoElement1);}
    if (tileId=="4") { meetingSession.audioVideo.bindVideoElement(tileId, videoElement1);}
    if (tileId=="5") { meetingSession.audioVideo.bindVideoElement(tileId, videoElement2);}
    
    $('#vi').html (tileId);                 
   
});
                    

                }
            };

            meetingSession.audioVideo.addObserver(observer);
            meetingSession.audioVideo.start();
            meetingSession.audioVideo.startLocalVideoTile();
        }) ();

请指导我们哪里出错了。