webrtc 对等连接：无法创建答案

Question

当我无法创建答案但连接状态已经是 have-remote-offer 时，我遇到了问题。

代码：

pc.ontrack = function(evt) {

  // signaling state is have-remote-offer
  logEvent('REMOTE', 'signalingstate', pc.signalingState);

  pc.createAnswer() // error here
    .then((answer) => {
       localConnection.setLocalDescription(answer);
       logEvent('REMOTE', 'signalingstate', pc.signalingState);

       socket.emit('session_description', JSON.stringify({ desc: answer.toJSON() }));
  });
};

错误：

Uncaught (in promise) DOMException: Peer Connection cannot create an answer in a state other than have-remote-offer 或 have-local-pranswer

有什么想法吗？

Answer 1

从 ontrack 调用 createAnswer 通常不会起作用。您需要从 setRemoteDescription .then() 调用它