如何生成 ICE 候选人？

Question

I'm developing a video conference with WebRTC in a local network, so I use only one signaling server to exchage SDP data. As I understand, I also need to exchange ICE candidates, but I don't know how to generate them. Thanks.

Answer 1

You can get the generated iceCandidate by setting the peerConnection.onicecandidate event.

(async () => {
  const pc = new RTCPeerConnection();
  pc.onicecandidate = evt => {
    console.log(evt.candidate?.candidate);
  };
  const stream = await navigator.mediaDevices.getUserMedia({video:true});
  stream.getTracks().forEach(track => pc.addTrack(track, stream));
  const offer = await pc.createOffer();
  await pc.setLocalDescription(offer);
})();

Answer 2

Do you create a configuration which contains at least one ice server url, and then use this configuration to create your RTCPeerConnection instance? When you set an ice server url, the 'icecandidate' event should be fired.

 const configuration = { iceServers: [{ urls: "stun:stun.l.google.com:19302" }], }; const pc = new RTCPeerConnection(configuration); pc.addEventListener('icecandidate', event => { if (event.candidate) { console.log('icecandidate received: ', event.candidate); } });