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var pc = null;
function negotiate() {
pc.addTransceiver('video', { direction: 'recvonly' });
pc.addTransceiver('audio', { direction: 'recvonly' });
return pc.createOffer().then((offer) => {
return pc.setLocalDescription(offer);
}).then(() => {
// wait for ICE gathering to complete
return new Promise((resolve) => {
if (pc.iceGatheringState === 'complete') {
resolve();
} else {
const checkState = () => {
if (pc.iceGatheringState === 'complete') {
pc.removeEventListener('icegatheringstatechange', checkState);
resolve();
}
};
pc.addEventListener('icegatheringstatechange', checkState);
}
});
}).then(() => {
var offer = pc.localDescription;
return fetch('/offer', {
body: JSON.stringify({
sdp: offer.sdp,
type: offer.type,
}),
headers: {
'Content-Type': 'application/json'
},
method: 'POST'
});
}).then((response) => {
return response.json();
}).then((answer) => {
return pc.setRemoteDescription(answer);
}).catch((e) => {
alert(e);
});
}
function start() {
var config = {
sdpSemantics: 'unified-plan'
};
if (document.getElementById('use-stun').checked) {
config.iceServers = [{ urls: ['stun:stun.l.google.com:19302'] }];
}
pc = new RTCPeerConnection(config);
// connect audio / video
pc.addEventListener('track', (evt) => {
if (evt.track.kind == 'video') {
document.getElementById('video').srcObject = evt.streams[0];
} else {
document.getElementById('audio').srcObject = evt.streams[0];
}
});
document.getElementById('start').style.display = 'none';
negotiate();
document.getElementById('stop').style.display = 'inline-block';
}
function stop() {
document.getElementById('stop').style.display = 'none';
// close peer connection
setTimeout(() => {
pc.close();
}, 500);
}
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