WebRTC Chrome M70 でいろいろ確認

chrome70webrtc.js

// Unified Plan の最低限のサンプル

const pc1 = new RTCPeerConnection({sdpSemantics: "unified-plan"});
const pc2 = new RTCPeerConnection({sdpSemantics: "unified-plan"});

const stream = await navigator.mediaDevices.getUserMedia({audio: true, video: true});

// pc1.addTrack(stream.getAudioTracks()[0], stream);
pc1.addTrack(stream.getVideoTracks()[0], stream);

// pc2.addTrack(stream.getAudioTracks()[0], stream);
pc2.addTrack(stream.getVideoTracks()[0], stream);

const offer = await pc1.createOffer();
await pc1.setLocalDescription(offer);

await pc2.setRemoteDescription(offer);
const answer = await pc2.createAnswer();
await pc2.setLocalDescription(answer);

await pc1.setRemoteDescription(answer);

pc1.getSenders()[0].getParameters();
pc2.getSenders()[0].getParameters();

// 以下で対応しているかどうかが取れる

RTCRtpSender.getCapabilities('video');
RTCRtpSender.getCapabilities('audio');

RTCRtpReceiver.getCapabilities('video');
RTCRtpReceiver.getCapabilities('audio');