466 lines
13 KiB
HTML
466 lines
13 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width">
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<style>
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html, body {
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margin: 0;
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padding: 0;
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height: 100%;
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overflow: hidden;
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}
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body {
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display: flex;
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flex-direction: column;
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}
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#video {
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height: 100%;
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background: black;
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flex-grow: 1;
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min-height: 0;
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}
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#controls {
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height: 200px;
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flex-shrink: 0;
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display: flex;
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align-items: center;
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justify-content: center;
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}
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#device {
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flex-direction: column;
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}
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#device > div {
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margin: 10px 0;
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display: flex;
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gap: 20px;
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justify-content: center;
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}
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select {
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width: 200px;
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}
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</style>
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</head>
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<body>
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<video id="video" muted controls autoplay playsinline></video>
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<div id="controls">
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<div id="initializing" style="display: block;">
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initializing
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</div>
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<div id="device" style="display: none;">
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<div id="device_line">
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video device:
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<select id="video_device">
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<option value="none">none</option>
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</select>
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audio device:
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<select id="audio_device">
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<option value="none">none</option>
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</select>
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</div>
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<div id="codec_line">
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video codec:
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<select id="video_codec">
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</select>
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audio codec:
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<select id="audio_codec">
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</select>
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</div>
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<div id="bitrate_line">
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video bitrate (kbps):
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<input id="video_bitrate" type="text" value="10000" />
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</div>
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<div id="submit_line">
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<button id="publish_confirm">publish</button>
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</div>
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</div>
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<div id="transmitting" style="display: none;">
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publishing
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</div>
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</div>
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<script>
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const INITIALIZING = 0;
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const DEVICE = 1;
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const TRANSMITTING = 2;
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let state = INITIALIZING;
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const setState = (newState) => {
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state = newState;
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switch (state) {
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case DEVICE:
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document.getElementById("initializing").style.display = 'none';
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document.getElementById("device").style.display = 'flex';
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document.getElementById("transmitting").style.display = 'none';
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break;
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case TRANSMITTING:
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document.getElementById("initializing").style.display = 'none';
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document.getElementById("device").style.display = 'none';
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document.getElementById("transmitting").style.display = 'flex';
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break;
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}
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};
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const restartPause = 2000;
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const linkToIceServers = (links) => (
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(links !== null) ? links.split(', ').map((link) => {
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const m = link.match(/^<(.+?)>; rel="ice-server"(; username="(.*?)"; credential="(.*?)"; credential-type="password")?/i);
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const ret = {
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urls: [m[1]],
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};
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if (m[3] !== undefined) {
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ret.username = m[3];
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ret.credential = m[4];
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ret.credentialType = "password";
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}
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return ret;
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}) : []
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);
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const parseOffer = (offer) => {
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const ret = {
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iceUfrag: '',
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icePwd: '',
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medias: [],
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};
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for (const line of offer.split('\r\n')) {
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if (line.startsWith('m=')) {
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ret.medias.push(line.slice('m='.length));
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} else if (ret.iceUfrag === '' && line.startsWith('a=ice-ufrag:')) {
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ret.iceUfrag = line.slice('a=ice-ufrag:'.length);
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} else if (ret.icePwd === '' && line.startsWith('a=ice-pwd:')) {
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ret.icePwd = line.slice('a=ice-pwd:'.length);
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}
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}
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return ret;
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};
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const generateSdpFragment = (offerData, candidates) => {
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const candidatesByMedia = {};
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for (const candidate of candidates) {
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const mid = candidate.sdpMLineIndex;
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if (candidatesByMedia[mid] === undefined) {
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candidatesByMedia[mid] = [];
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}
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candidatesByMedia[mid].push(candidate);
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}
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let frag = 'a=ice-ufrag:' + offerData.iceUfrag + '\r\n'
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+ 'a=ice-pwd:' + offerData.icePwd + '\r\n';
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let mid = 0;
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for (const media of offerData.medias) {
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if (candidatesByMedia[mid] !== undefined) {
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frag += 'm=' + media + '\r\n'
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+ 'a=mid:' + mid + '\r\n';
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for (const candidate of candidatesByMedia[mid]) {
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frag += 'a=' + candidate.candidate + '\r\n';
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}
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}
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mid++;
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}
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return frag;
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}
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class Transmitter {
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constructor(stream) {
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this.stream = stream;
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this.pc = null;
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this.restartTimeout = null;
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this.eTag = '';
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this.queuedCandidates = [];
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this.start();
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}
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start() {
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console.log("requesting ICE servers");
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fetch('whip', {
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method: 'OPTIONS',
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})
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.then((res) => this.onIceServers(res))
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.catch((err) => {
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console.log('error: ' + err);
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this.scheduleRestart();
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});
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}
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onIceServers(res) {
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this.pc = new RTCPeerConnection({
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iceServers: linkToIceServers(res.headers.get('Link')),
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});
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this.pc.onicecandidate = (evt) => this.onLocalCandidate(evt);
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this.pc.oniceconnectionstatechange = () => this.onConnectionState();
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this.stream.getTracks().forEach((track) => {
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this.pc.addTrack(track, this.stream);
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});
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this.pc.createOffer()
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.then((desc) => {
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this.offerData = parseOffer(desc.sdp);
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this.pc.setLocalDescription(desc);
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console.log("sending offer");
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const videoCodec = document.getElementById('video_codec').value;
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const audioCodec = document.getElementById('audio_codec').value;
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const videoBitrate = document.getElementById('video_bitrate').value;
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let params = '?video_codec=' + videoCodec +
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'&audio_codec=' + audioCodec +
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'&video_bitrate=' + videoBitrate;
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fetch('whip' + params, {
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method: 'POST',
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headers: {
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'Content-Type': 'application/sdp',
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},
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body: desc.sdp,
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})
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.then((res) => {
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if (res.status !== 201) {
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throw new Error('bad status code');
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}
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this.eTag = res.headers.get('E-Tag');
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return res.text();
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})
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.then((sdp) => this.onRemoteDescription(new RTCSessionDescription({
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type: 'answer',
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sdp,
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})))
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.catch((err) => {
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console.log('error: ' + err);
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this.scheduleRestart();
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});
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});
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}
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onConnectionState() {
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if (this.restartTimeout !== null) {
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return;
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}
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console.log("peer connection state:", this.pc.iceConnectionState);
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switch (this.pc.iceConnectionState) {
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case "disconnected":
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this.scheduleRestart();
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}
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}
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onRemoteDescription(answer) {
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if (this.restartTimeout !== null) {
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return;
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}
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this.pc.setRemoteDescription(new RTCSessionDescription(answer));
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if (this.queuedCandidates.length !== 0) {
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this.sendLocalCandidates(this.queuedCandidates);
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this.queuedCandidates = [];
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}
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}
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onLocalCandidate(evt) {
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if (this.restartTimeout !== null) {
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return;
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}
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if (evt.candidate !== null) {
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if (this.eTag === '') {
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this.queuedCandidates.push(evt.candidate);
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} else {
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this.sendLocalCandidates([evt.candidate])
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}
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}
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}
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sendLocalCandidates(candidates) {
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fetch('whip', {
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method: 'PATCH',
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headers: {
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'Content-Type': 'application/trickle-ice-sdpfrag',
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'If-Match': this.eTag,
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},
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body: generateSdpFragment(this.offerData, candidates),
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})
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.then((res) => {
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if (res.status !== 204) {
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throw new Error('bad status code');
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}
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})
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.catch((err) => {
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console.log('error: ' + err);
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this.scheduleRestart();
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});
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}
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scheduleRestart() {
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if (this.restartTimeout !== null) {
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return;
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}
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if (this.pc !== null) {
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this.pc.close();
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this.pc = null;
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}
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this.restartTimeout = window.setTimeout(() => {
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this.restartTimeout = null;
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this.start();
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}, restartPause);
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this.eTag = '';
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this.queuedCandidates = [];
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}
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}
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const onTransmit = (stream) => {
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setState(TRANSMITTING);
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document.getElementById('video').srcObject = stream;
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new Transmitter(stream);
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};
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const onPublish = () => {
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const videoId = document.getElementById('video_device').value;
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const audioId = document.getElementById('audio_device').value;
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if (videoId !== 'screen') {
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let video = false;
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if (videoId !== 'none') {
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video = {
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deviceId: videoId,
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};
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}
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let audio = false;
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if (audioId !== 'none') {
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audio = {
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deviceId: audioId,
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};
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}
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navigator.mediaDevices.getUserMedia({ video, audio })
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.then(onTransmit);
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} else {
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navigator.mediaDevices.getDisplayMedia({
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video: {
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width: { ideal: 1920 },
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height: { ideal: 1080 },
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frameRate: { ideal: 30 },
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cursor: "always",
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},
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audio: false,
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})
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.then(onTransmit);
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}
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};
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const populateDevices = () => {
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return navigator.mediaDevices.enumerateDevices()
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.then((devices) => {
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for (const device of devices) {
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switch (device.kind) {
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case 'videoinput':
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{
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const opt = document.createElement('option');
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opt.value = device.deviceId;
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opt.text = device.label;
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document.getElementById('video_device').appendChild(opt);
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}
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break;
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case 'audioinput':
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{
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const opt = document.createElement('option');
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opt.value = device.deviceId;
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opt.text = device.label;
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document.getElementById('audio_device').appendChild(opt);
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}
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break;
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}
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}
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// add screen
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const opt = document.createElement('option');
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opt.value = "screen";
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opt.text = "screen";
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document.getElementById('video_device').appendChild(opt);
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// set default
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document.getElementById('video_device').value = document.getElementById('video_device').children[1].value;
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if (document.getElementById('audio_device').children.length > 1) {
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document.getElementById('audio_device').value = document.getElementById('audio_device').children[1].value;
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}
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});
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};
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const populateCodecs = () => {
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const pc = new RTCPeerConnection({});
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pc.addTransceiver("video", { direction: 'sendonly' });
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pc.addTransceiver("audio", { direction: 'sendonly' });
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return pc.createOffer()
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.then((desc) => {
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const sdp = desc.sdp.toLowerCase();
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for (const codec of ['av1/90000', 'vp9/90000', 'vp8/90000', 'h264/90000']) {
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if (sdp.includes(codec)) {
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const opt = document.createElement('option');
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opt.value = codec.split('/')[0];
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opt.text = codec.split('/')[0].toUpperCase();
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document.getElementById('video_codec').appendChild(opt);
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}
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}
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for (const codec of ['opus/48000', 'g722/8000', 'pcmu/8000', 'pcma/8000']) {
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if (sdp.includes(codec)) {
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const opt = document.createElement('option');
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opt.value = codec.split('/')[0];
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opt.text = codec.split('/')[0].toUpperCase();
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document.getElementById('audio_codec').appendChild(opt);
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}
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}
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pc.close();
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});
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};
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const initialize = () => {
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navigator.mediaDevices.getUserMedia({ video: true, audio: true })
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.then(() => Promise.all([
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populateDevices(),
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populateCodecs(),
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]))
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.then(() => {
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setState(DEVICE);
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});
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};
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document.getElementById("publish_confirm").addEventListener('click', onPublish);
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initialize();
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</script>
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</body>
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</html>
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