WebRTC：在Firefox中重新谈判 [英] WebRTC: Renegotiation in firefox

问题描述

根据这篇文章，重新谈判在firefox v38中实现，我们可以从相同的peerconnections添加删除流而不创建新的，但我无法找到任何工作演示，以支持这种说法，当我尝试了，两个用户在视频模式chating，我改变其中之一他们的流到音频，我得到错误：

lockquote>

NotSupportedError：removeStream not yet实施

告诉相同，但是这个告诉重新协商事件被支持，但不是 removeStream 重新协商的关键部分？我在Windows 7中使用的是Firefox 39版本。我很困惑，firefox目前还不支持重新协商，对吧？ 解决方案

对单个轨道使用 replaceTrack ，而不是替换整个流。这个例子假设你有一个对等连接 pc1 和一个新流 newStream 来取代它。获取发件人，并用新流中的适当曲目替换曲目。工作示例此处。

  Promise.all（pc1.getSenders（）。map（sender => 
 sender.replaceTrack（（sender.track.kind ==audio）？
 newStream.getAudioTracks（） （0）：
 newStream.getVideoTracks（）[0]））
 .then（（）=> log（Flip！））
 .catch（failed）; 
  

另外请注意，从您的第一个链接：

  function screenShare（）{
 let screenConstraints = {video：{mediaSource：screen}}; 
 
 navigator.mediaDevices.getUserMedia（screenConstraints）
 .then（stream）{
 stream.getTracks（）。forEach（track）{
 screenStream = stream; 
 screenSenders.push（pc1.addTrack（track，stream））; 
}）; 
}）; 
 
 
 
 $ b $ p 
 $ b 
注意这个例子调用 pc1.addTrack  not  pc1.addStream  
 
 
 
而在相反的情况下， 
 
 $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ （）; 
 screenSenders.forEach（sender）{
 pc1.removeTrack（sender）; 
}）; 
} 
  




According to this article, re-negotiation is implemented in firefox v38 and we can add remove streams from same peerconnections without creating new ones, but I am unable to find any working demos to support that claim, and when I tried it, two users chating in video mode, I changing one of their stream to audio, I get the error:

NotSupportedError: removeStream not yet implemented

this tells the same, but this tells renegotiation events are supported, but isn't removeStream key part of renegotiation? I am using firefox version 39 in windows 7. I am confused, renegotiation is not yet supported in firefox, right?

解决方案

Try using replaceTrack for individual tracks, instead of replacing the entire stream. This example assumes you have a peer connection pc1 and a new stream newStream to replace on it. Get the senders, and replace the tracks with appropriate tracks from the new stream. Working sample here.

Promise.all(pc1.getSenders().map(sender =>
  sender.replaceTrack((sender.track.kind == "audio")?
                      newStream.getAudioTracks()[0] :
                      newStream.getVideoTracks()[0])))
.then(() => log("Flip!"))
.catch(failed);

Also note this, from your first link:

function screenShare() {
    let screenConstraints = {video: {mediaSource: "screen"}};

    navigator.mediaDevices.getUserMedia(screenConstraints)
    .then(stream) {
        stream.getTracks().forEach(track) {
            screenStream = stream;
            screenSenders.push(pc1.addTrack(track, stream));
        });
    });
}

Notice that this example calls pc1.addTrack not pc1.addStream

And in the same in reverse, for removing - pc1.removeTrack:

function stopScreenShare() {
    screenStream.stop();
    screenSenders.forEach(sender) {
        pc1.removeTrack(sender);
    });
}

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