Opentok视频通话是扬声器用户ID

Question

我已经在我的角度6中集成了OT视频通话会话。

这是发布商流代码

    const publisher = OT.initPublisher('publisher', {
     name: 'pubname',
  style: { 'buttonDisplayMode': 'off'},
  insertMode: 'append',
  width: '100%',
  fitMode: 'contain',
  height: '100%'
  });

这是订阅者流代码：

session.subscribe(event.stream, dup_div, {
  insertMode: 'append',
  name:'subname',
 style: { 'buttonDisplayMode': 'off'},
width: '100%',
fitMode: 'contain',
height: '100%'
});

这工作正常。我的流中有4个订阅者。如果是这样，我想得到谁说话。也就是说，如果订户1提出问题，那么其他人应该让Subscriber1发言。所以我希望获得正在发言的用户ID。我如何使用captureStream()或getAudioTracks()获得此功能。

请帮我找到这个。我没有得到任何关于此的示例或示例代码。

Answer 1

我能想到有几种选择。

1. 您可以使用Subscriber "audioLevelUpdated" Events，如果它们超过阈值，那么您说用户正在说话。就像是：

   const subscriber = session.subscribe(stream);
   subscriber.on('audioLevelUpdated', () => {
     if (movingAvg === null || movingAvg <= event.audioLevel) {
       movingAvg = event.audioLevel;
     } else {
       movingAvg = 0.7 * movingAvg + 0.3 * event.audioLevel;
     }
   
     // 1.5 scaling to map the -30 - 0 dBm range to [0,1]
     let logLevel = (Math.log(movingAvg) / Math.LN10) / 1.5 + 1;
     logLevel = Math.min(Math.max(logLevel, 0), 1);
     if (logLevel > 0.5) {
       // They are speaking, do whatever you need to do here
     }
   });  

2. 您可以使用已经有用的“讲话”事件的hark.js library，然后将这些事件发送给其他参与者。

   const publisher = OT.initPublisher();
   // Create a new MediaStream with the audio track from the Publisher
   const mediaStream = new MediaStream([publisher.getAudioSource()]);
   const speech = hark(mediaStream, options);
   speech.on('speaking', () => {
     // They are speaking
     session.signal({ type: 'speaking'});
   });
   const subscribersByConnectionId = {};
   session.on('streamCreated', (event) => {
     const subscriber = session.subscribe(event.stream);
     subscribersByConnectionId[event.stream.connection.connectionId] = subscriber;
     subscriber.on('destroyed', (event) => {
       delete subscribersByConnectionId[event.stream.connection.connectionId];
     });
   });
   session.on('signal:speaking', (event) => {
     const subscriberSpeaking = subscribersByConnectionId[event.from.connectionId];
     // Do whatever you want with the subscriber that is speaking
   });