gtk2k.github.io/webrtc_ff.html at master · Roulyoung/gtk2k.github.io · GitHub

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<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf8">
    </head>
    <body>
        <video id="localView"></video>
        <video id="remoteView"></video>
        <button id="btnStart">start</button>
        <script src="https://localhost:4001/socket.io/socket.io.js"></script>
        <script>
            var signalingChannel = io.connect('https://localhost:4001');
            var configuration = { "iceServers": [{ "urls": "stun:stun.l.google.com:19302" }] };
            var pc;
            // call start() to initiate
            function start() {
                pc = new RTCPeerConnection(configuration);

                // send any ice candidates to the other peer
                pc.onicecandidate = function (evt) {
                    if (evt.candidate)
                        signalingChannel.send(JSON.stringify({ "candidate": evt.candidate }));
                };

                // let the "negotiationneeded" event trigger offer generation
                pc.onnegotiationneeded = function () {
                    pc.createOffer().then(function (offer) {
                        return pc.setLocalDescription(offer);
                    })
                    .then(function () {
                        // send the offer to the other peer
                        signalingChannel.send(JSON.stringify({ "desc": pc.localDescription }));
                    })
                    .catch(logError);
                };

                // once remote video track arrives, show it in the remote video element
                pc.ontrack = function (evt) {
                    if (evt.track.kind === "video")
                    remoteView.srcObject = evt.streams[0];
                };

                // get a local stream, show it in a self-view and add it to be sent
                navigator.mediaDevices.getUserMedia({ "audio": false, "video": true }, function (stream) {
                    selfView.srcObject = stream;
                    if (stream.getAudioTracks().length > 0)
                        pc.addTrack(stream.getAudioTracks()[0], stream);
                    if (stream.getVideoTracks().length > 0)
                        pc.addTrack(stream.getVideoTracks()[0], stream);
                }, logError);
            }

            signalingChannel.onmessage = function (evt) {
                if (!pc)
                    start();

                var message = JSON.parse(evt.data);
                if (message.desc) {
                    var desc = message.desc;

                    // if we get an offer, we need to reply with an answer
                    if (desc.type == "offer") {
                        pc.setRemoteDescription(desc).then(function () {
                            return pc.createAnswer();
                        })
                        .then(function (answer) {
                            return pc.setLocalDescription(answer);
                        })
                        .then(function () {
                            signalingChannel.send(JSON.stringify({ "desc": pc.localDescription }));
                        })
                        .catch(logError);
                    } else if (desc.type == "answer") {
                        pc.setRemoteDescription(desc).catch(logError);
                    } else {
                        log("Unsupported SDP type. Your code may differ here.");
                    }
                } else
                    pc.addIceCandidate(message.candidate).catch(logError);
            };

            function logError(error) {
                log(error.name + ": " + error.message);
            }

            btnStart.onclick = start;
        </script>
    </body>
</html>