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window.onload = function demo() {
// create peer connection
let pc = new RTCPeerConnection({
iceCandidatePoolSize: 4
});
// create websocket for signaling channel
let ws = new WebSocket('ws://localhost:8080');
// (callback) called upon discovery of new local ICE candidate
pc.onicecandidate = function(event) {
if (event.candidate) {
console.log("local candidate:\n%c%s", "color: green", event.candidate.candidate);
ws.send(JSON.stringify(event.candidate));
}
};
// (callback) called upon reception of new remote video track
pc.ontrack = function(event) {
document.getElementById("remoteVideo").srcObject = event.streams[0];
};
// receive remote answer or candidate
ws.onmessage = function(event) {
try {
let d = JSON.parse(event.data);
if ('candidate' in d) {
if (d.candidate) {
console.log("remote candidate:\n%c%s", "color: blue;", d.candidate);
pc.addIceCandidate(d).catch((e) => {
console.log("addIceCandidate:\n%c%s", "color: red;", e);
});
}
} else if ('sdp' in d) {
pc.setRemoteDescription(d).catch((e) => {
console.log("setRemoteDescription:\n%c%s", "color: red;", e);
});
console.log("remote answer:\n%c%s", "color: blue;", d.sdp);
}
} catch(e) {
console.log("remote error:\n%c%s", "color: red;", event.data);
}
};
// create offer and set to remote peer
ws.onopen = function(event) {
pc.createOffer({ offerToReceiveVideo: true }).then(function(offer) {
console.log("local offer:\n%c%s", "color: green;", offer.sdp);
pc.setLocalDescription(offer);
ws.send(JSON.stringify(offer));
});
};
}
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