更换摄像头和麦克风后如何恢复协商? [英] how to restore the negotiation after changing the camera and microphone?

问题描述

大约一个月前，一位 Stackoverflow 合作伙伴帮我解决了一个大问题，比如在会议期间更换摄像头和麦克风.该问题已在以下链接中得到解答:

About a month ago, a Stackoverflow partner helped me with a big question, like changing the camera and the microphone during a conference. That question was answered in the following link:

使用WebRTC如何选择麦克风和摄像头?

更换摄像头和麦克风后，之前的媒体流仍然有效.所以会议中的其他人无法以某种方式接收到我的新流量.

After changing the camera and microphone, the previous media flow remains active. So the other people in the conference can not receive the new flow I have in some way.

如有必要，我想知道如何重新协商这个新流程.

I would like to know how to renegotiate this new flow, if necessary.

我在项目中用于 webRTC 实现的库是simplewebRTC"，目前已废弃.

The library that I use for webRTC implementation in the project is "simplewebRTC" currently in disuse.

我用来更换设备的代码完全基于我在上一个问题中取得的成果......

The code I use to change devices is based entirely on what was achieved in my previous question ...

推荐答案

我不知道 simpleWebRTC，但在普通的 WebRTC 中不需要重新协商.

I don't know about simpleWebRTC, but in plain WebRTC renegotiation is not necessary.

只需使用 sender.replaceTrack().它是异步的，所以要同时切换摄像头和麦克风:

Just use sender.replaceTrack(). It's async, so to switch both camera and mic at the same time:

navigator.mediaDevices.getUserMedia(constraints) 
  .then(stream => {
    video.srcObject = stream;
    return Promise.all(stream.getTracks().map(track => {
      const sender = pc.getSenders().find((s => s.track.kind == track.kind);
      return sender.replaceTrack(track);
    }));
  })
  .catch(err => console.log(err));

这应该会立即导致发送者切换到从您的新摄像头和麦克风发送媒体.对方不会知道其中的区别.

This should instantly cause the sender to switch to sending media from your new camera and microphone. The other side won't know the difference.

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