Alexey Khit
590 lines
18 KiB
JavaScript
590 lines
18 KiB
JavaScript
/**
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* Video player for MSE and WebRTC connections.
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*
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* All modern web technologies are supported in almost any browser except Apple Safari.
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*
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* Support:
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* - RTCPeerConnection for Safari iOS 11.0+
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* - IntersectionObserver for Safari iOS 12.2+
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*
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* Doesn't support:
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* - MediaSource for Safari iOS all
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* - Customized built-in elements (extends HTMLVideoElement) because all Safari
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* - Public class fields because old Safari (before 14.0)
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*/
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class VideoRTC extends HTMLElement {
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constructor() {
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super();
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this.DISCONNECT_TIMEOUT = 5000;
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this.RECONNECT_TIMEOUT = 30000;
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this.CODECS = [
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"avc1.640029", // H.264 high 4.1 (Chromecast 1st and 2nd Gen)
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"avc1.64002A", // H.264 high 4.2 (Chromecast 3rd Gen)
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"avc1.640033", // H.264 high 5.1 (Chromecast with Google TV)
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"hvc1.1.6.L153.B0", // H.265 main 5.1 (Chromecast Ultra)
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"mp4a.40.2", // AAC LC
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"mp4a.40.5", // AAC HE
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"mp4a.69", // MP3
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"mp4a.6B", // MP3
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];
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/**
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* Supported modes (webrtc, mse, mp4, mjpeg).
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* @type {string}
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*/
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this.mode = "webrtc,mse,mp4,mjpeg";
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/**
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* Run stream when not displayed on the screen. Default `false`.
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* @type {boolean}
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*/
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this.background = false;
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/**
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* Run stream only when player in the viewport. Stop when user scroll out player.
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* Value is percentage of visibility from `0` (not visible) to `1` (full visible).
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* Default `0` - disable;
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* @type {number}
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*/
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this.intersectionThreshold = 0;
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/**
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* Run stream only when browser page on the screen. Stop when user change browser
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* tab or minimise browser windows.
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* @type {boolean}
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*/
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this.visibilityCheck = true;
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/**
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* @type {HTMLVideoElement}
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*/
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this.video = null;
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/**
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* @type {WebSocket}
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*/
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this.ws = null;
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/**
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* Internal WebSocket connection state. Values: CONNECTING, OPEN, CLOSED
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* @type {number}
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*/
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this.wsState = WebSocket.CLOSED;
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/**
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* Internal WebSocket URL.
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* @type {string|URL}
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*/
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this.url = "";
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/**
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* @type {RTCPeerConnection}
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*/
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this.pc = null;
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/**
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* @type {number}
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*/
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this.pcState = WebSocket.CLOSED;
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this.pcConfig = {iceServers: [{urls: "stun:stun.l.google.com:19302"}]};
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/**
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* Internal disconnect TimeoutID.
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* @type {number}
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*/
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this.disconnectTimeout = 0;
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/**
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* Internal reconnect TimeoutID.
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* @type {number}
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*/
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this.reconnectTimeout = 0;
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/**
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* Handler for receiving Binary from WebSocket
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* @type {Function}
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*/
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this.ondata = null;
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/**
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* Handlers list for receiving JSON from WebSocket
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* @type {Object.<string,Function>}}
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*/
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this.onmessage = null;
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}
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/** public properties **/
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/**
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* Set video source (WebSocket URL). Support relative path.
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* @param {string|URL} value
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*/
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set src(value) {
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if (typeof value !== "string") value = value.toString();
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if (value.startsWith("http")) {
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value = "ws" + value.substring(4);
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} else if (value.startsWith("/")) {
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value = "ws" + location.origin.substring(4) + value;
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}
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this.url = value;
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if (this.isConnected) this.connectedCallback();
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}
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/**
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* Play video. Support automute when autoplay blocked.
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* https://developer.chrome.com/blog/autoplay/
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*/
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play() {
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this.video.play().catch(er => {
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if (er.name === "NotAllowedError" && !this.video.muted) {
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this.video.muted = true;
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this.video.play().catch(() => console.debug);
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}
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});
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}
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/**
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* Send message to server via WebSocket
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* @param {Object} value
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*/
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send(value) {
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if (this.ws) this.ws.send(JSON.stringify(value));
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}
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get closed() {
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return this.wsState === WebSocket.CLOSED && this.pcState === WebSocket.CLOSED;
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}
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codecs(type) {
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const test = type === "mse"
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? codec => MediaSource.isTypeSupported(`video/mp4; codecs="${codec}"`)
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: codec => this.video.canPlayType(`video/mp4; codecs="${codec}"`);
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return this.CODECS.filter(test).join();
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}
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/**
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* `CustomElement`. Invoked each time the custom element is appended into a
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* document-connected element.
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*/
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connectedCallback() {
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console.debug("VideoRTC.connectedCallback", this.wsState, this.pcState);
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if (this.disconnectTimeout) {
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clearTimeout(this.disconnectTimeout);
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this.disconnectTimeout = 0;
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}
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// because video autopause on disconnected from DOM
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if (this.video) {
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const seek = this.video.seekable;
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if (seek.length > 0) {
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this.video.currentTime = seek.end(seek.length - 1);
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this.play();
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}
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}
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if (!this.url || !this.closed) return;
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// CLOSED => CONNECTING
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this.wsState = WebSocket.CONNECTING;
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this.internalInit();
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this.internalConnect();
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}
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/**
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* `CustomElement`. Invoked each time the custom element is disconnected from the
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* document's DOM.
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*/
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disconnectedCallback() {
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console.debug("VideoRTC.disconnectedCallback", this.wsState, this.pcState);
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if (this.background || this.disconnectTimeout || this.closed) return;
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this.disconnectTimeout = setTimeout(() => {
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if (this.reconnectTimeout) {
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clearTimeout(this.reconnectTimeout);
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this.reconnectTimeout = 0;
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}
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this.disconnectTimeout = 0;
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this.wsState = WebSocket.CLOSED;
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if (this.ws) {
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this.ws.close();
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this.ws = null;
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}
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this.pcState = WebSocket.CLOSED;
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if (this.pc) {
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this.pc.close();
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this.pc = null;
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}
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}, this.DISCONNECT_TIMEOUT);
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}
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internalInit() {
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if (this.childElementCount) return;
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this.video = document.createElement("video");
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this.video.controls = true;
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this.video.playsInline = true;
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this.video.preload = "auto";
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this.appendChild(this.video);
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// important for second video for mode MP4
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this.style.display = "block";
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this.style.position = "relative";
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this.video.style.display = "block"; // fix bottom margin 4px
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this.video.style.width = "100%";
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this.video.style.height = "100%"
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if (this.background) return;
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if ("hidden" in document && this.visibilityCheck) {
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document.addEventListener("visibilitychange", () => {
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if (document.hidden) {
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this.disconnectedCallback();
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} else if (this.isConnected) {
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this.connectedCallback();
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}
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})
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}
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if ("IntersectionObserver" in window && this.intersectionThreshold) {
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const observer = new IntersectionObserver(entries => {
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entries.forEach(entry => {
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if (!entry.isIntersecting) {
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this.disconnectedCallback();
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} else if (this.isConnected) {
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this.connectedCallback();
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}
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});
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}, {threshold: this.intersectionThreshold});
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observer.observe(this);
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}
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}
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internalConnect() {
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if (this.wsState !== WebSocket.CONNECTING) return;
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if (this.ws) throw "connect with non null WebSocket";
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const ts = Date.now();
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this.ws = new WebSocket(this.url);
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this.ws.binaryType = "arraybuffer";
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this.ws.addEventListener("open", () => {
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console.debug("VideoRTC.ws.open", this.wsState);
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// CONNECTING => OPEN
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this.wsState = WebSocket.OPEN;
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this.internalOpen();
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});
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this.ws.addEventListener("close", () => {
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console.debug("VideoRTC.ws.close", this.wsState);
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if (this.wsState === WebSocket.CLOSED) return;
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// CONNECTING, OPEN => CONNECTING
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this.wsState = WebSocket.CONNECTING;
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this.ws = null;
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// reconnect no more than once every X seconds
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const delay = Math.max(this.RECONNECT_TIMEOUT - (Date.now() - ts), 0);
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this.reconnectTimeout = setTimeout(() => {
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this.reconnectTimeout = 0;
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this.internalConnect();
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}, delay);
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});
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}
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internalOpen() {
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this.ws.addEventListener("message", ev => {
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if (typeof ev.data === "string") {
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const msg = JSON.parse(ev.data);
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for (const mode in this.onmessage) {
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this.onmessage[mode](msg);
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}
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} else {
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this.ondata(ev.data);
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}
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});
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this.ondata = null;
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this.onmessage = {};
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let firstMode = "";
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if (this.mode.indexOf("mse") >= 0 && "MediaSource" in window) { // iPhone
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firstMode ||= "mse";
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this.internalMSE();
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} else if (this.mode.indexOf("mp4") >= 0) {
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firstMode ||= "mp4";
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this.internalMP4();
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}
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if (this.mode.indexOf("webrtc") >= 0 && "RTCPeerConnection" in window) { // macOS Desktop app
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firstMode ||= "webrtc";
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this.internalRTC();
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}
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if (this.mode.indexOf("mjpeg") >= 0) {
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if (firstMode) {
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this.onmessage["mjpeg"] = msg => {
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if (msg.type !== "error" || msg.value.indexOf(firstMode) !== 0) return;
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this.internalMJPEG();
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}
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} else {
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this.internalMJPEG();
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}
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}
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}
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internalMSE() {
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console.debug("VideoRTC.internalMSE");
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const ms = new MediaSource();
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ms.addEventListener("sourceopen", () => {
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console.debug("VideoRTC.ms.sourceopen");
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URL.revokeObjectURL(this.video.src);
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this.send({type: "mse", value: this.codecs("mse")});
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}, {once: true});
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this.video.src = URL.createObjectURL(ms);
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this.video.srcObject = null;
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this.play();
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this.onmessage["mse"] = msg => {
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if (msg.type !== "mse") return;
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const sb = ms.addSourceBuffer(msg.value);
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sb.mode = "segments"; // segments or sequence
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sb.addEventListener("updateend", () => {
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if (sb.updating) return;
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if (bufLen > 0) {
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try {
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sb.appendBuffer(buf.slice(0, bufLen));
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} catch (e) {
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console.debug(e);
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}
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bufLen = 0;
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} else if (sb.buffered.length) {
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const end = sb.buffered.end(sb.buffered.length - 1) - 5;
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const start = sb.buffered.start(0);
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if (end > start) {
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sb.remove(start, end);
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ms.setLiveSeekableRange(end, end + 5);
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}
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// console.debug("VideoRTC.buffered", start, end);
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}
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});
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const buf = new Uint8Array(2 * 1024 * 1024);
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let bufLen = 0;
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this.ondata = data => {
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if (sb.updating || bufLen > 0) {
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const b = new Uint8Array(data);
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buf.set(b, bufLen);
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bufLen += b.byteLength;
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// console.debug("VideoRTC.buffer", b.byteLength, bufLen);
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} else {
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try {
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sb.appendBuffer(data);
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} catch (e) {
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// console.debug(e);
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}
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}
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}
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}
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}
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internalRTC() {
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console.debug("VideoRTC.internalRTC");
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const pc = new RTCPeerConnection(this.pcConfig);
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let mseCodecs = "";
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/** @type {HTMLVideoElement} */
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const video2 = document.createElement("video");
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video2.addEventListener("loadeddata", () => {
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console.debug("VideoRTC.video.loadeddata", video2.readyState, pc.connectionState);
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// Firefox doesn't support pc.connectionState
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if (pc.connectionState === "connected" || pc.connectionState === "connecting" || !pc.connectionState) {
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// Video+Audio > Video, H265 > H264, Video > Audio, WebRTC > MSE
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let rtcPriority = 0, msePriority = 0;
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/** @type {MediaStream} */
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const rtc = video2.srcObject;
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if (rtc.getVideoTracks().length > 0) rtcPriority += 0x220;
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if (rtc.getAudioTracks().length > 0) rtcPriority += 0x102;
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if (mseCodecs.indexOf("hvc1.") >= 0) msePriority += 0x230;
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if (mseCodecs.indexOf("avc1.") >= 0) msePriority += 0x210;
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if (mseCodecs.indexOf("mp4a.") >= 0) msePriority += 0x101;
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if (rtcPriority >= msePriority) {
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console.debug("VideoRTC.select RTC mode", rtcPriority, msePriority);
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this.video.controls = true;
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this.video.srcObject = rtc;
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this.play();
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this.pcState = WebSocket.OPEN;
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this.wsState = WebSocket.CLOSED;
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this.ws.close();
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this.ws = null;
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} else {
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console.debug("VideoRTC.select MSE mode", rtcPriority, msePriority);
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pc.close();
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this.pcState = WebSocket.CLOSED;
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this.pc = null;
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}
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}
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video2.srcObject = null;
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}, {once: true});
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pc.addEventListener("icecandidate", ev => {
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const candidate = ev.candidate ? ev.candidate.toJSON().candidate : "";
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this.send({type: "webrtc/candidate", value: candidate});
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});
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pc.addEventListener("track", ev => {
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console.debug("VideoRTC.pc.track", ev.streams.length);
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// when stream already init
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if (video2.srcObject !== null) return;
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// when audio track not exist in Chrome
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if (ev.streams.length === 0) return;
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// when audio track not exist in Firefox
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if (ev.streams[0].id[0] === '{') return;
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video2.srcObject = ev.streams[0];
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});
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pc.addEventListener("connectionstatechange", () => {
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console.debug("VideoRTC.pc.connectionstatechange", this.pc.connectionState);
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if (pc.connectionState === "failed" || pc.connectionState === "disconnected") {
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pc.close(); // stop next events
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this.pcState = WebSocket.CLOSED;
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this.pc = null;
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if (this.wsState === WebSocket.CLOSED && this.isConnected) {
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this.connectedCallback();
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}
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}
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});
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this.onmessage["webrtc"] = msg => {
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switch (msg.type) {
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case "webrtc/candidate":
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pc.addIceCandidate({candidate: msg.value, sdpMid: "0"}).catch(() => console.debug);
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break;
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case "webrtc/answer":
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pc.setRemoteDescription({type: "answer", sdp: msg.value}).catch(() => console.debug);
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break;
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case "mse":
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mseCodecs = msg.value;
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break;
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case "error":
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if (msg.value.indexOf("webrtc/offer") < 0) return;
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pc.close();
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}
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};
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// Safari doesn't support "offerToReceiveVideo"
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pc.addTransceiver("video", {direction: "recvonly"});
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pc.addTransceiver("audio", {direction: "recvonly"});
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pc.createOffer().then(offer => {
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pc.setLocalDescription(offer).then(() => {
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this.send({type: "webrtc/offer", value: offer.sdp});
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});
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});
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this.pcState = WebSocket.CONNECTING;
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this.pc = pc;
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}
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internalMJPEG() {
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console.debug("VideoRTC.internalMJPEG");
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this.ondata = data => {
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this.video.poster = "data:image/jpeg;base64," + VideoRTC.btoa(data);
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};
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this.send({type: "mjpeg"});
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this.video.controls = false;
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}
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internalMP4() {
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console.debug("VideoRTC.internalMP4");
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/** @type {HTMLVideoElement} */
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let video2;
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this.ondata = data => {
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// first video with default position (set container size)
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// second video with position=absolute and top=0px
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if (video2) {
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this.removeChild(this.video);
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this.video.src = "";
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this.video = video2;
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video2.style.position = "";
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video2.style.top = "";
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}
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video2 = this.video.cloneNode();
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video2.style.position = "absolute";
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video2.style.top = "0px";
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this.appendChild(video2);
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video2.src = "data:video/mp4;base64," + VideoRTC.btoa(data);
|
|
video2.play().catch(() => console.log);
|
|
};
|
|
|
|
this.ws.addEventListener("close", () => {
|
|
if (!video2) return;
|
|
|
|
this.removeChild(video2);
|
|
video2.src = "";
|
|
});
|
|
|
|
this.send({type: "mp4", value: this.codecs("mp4")});
|
|
this.video.controls = false;
|
|
}
|
|
|
|
static btoa(buffer) {
|
|
const bytes = new Uint8Array(buffer);
|
|
const len = bytes.byteLength;
|
|
let binary = "";
|
|
for (let i = 0; i < len; i++) {
|
|
binary += String.fromCharCode(bytes[i]);
|
|
}
|
|
return window.btoa(binary);
|
|
}
|
|
}
|
|
|
|
customElements.define("video-rtc", VideoRTC);
|