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plugin.js
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plugin.js
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import videojs from 'video.js';
import { version as VERSION } from '../package.json';
// import request from 'request';
// Default options for the plugin.
const defaults = {};
// Cache for image elements
const cache = {};
// Cross-compatibility for Video.js 5 and 6.
const registerPlugin = videojs.registerPlugin || videojs.plugin;
// const dom = videojs.dom || videojs;
/**
* Function to invoke when the player is ready.
*
* This is a great place for your plugin to initialize itself. When this
* function is called, the player will have its DOM and child components
* in place.
*
* @function onPlayerReady
* @param {Player} player
* A Video.js player object.
*
* @param {Object} [options={}]
* A plain object containing options for the plugin.
*/
const onPlayerReady = (player, options) => {
player.addClass('vjs-vtt-thumbnails');
// eslint-disable-next-line new-cap, no-use-before-define
player.vttThumbnails = new vttThumbnailsPlugin(player, options);
};
/**
* A video.js plugin.
*
* In the plugin function, the value of `this` is a video.js `Player`
* instance. You cannot rely on the player being in a "ready" state here,
* depending on how the plugin is invoked. This may or may not be important
* to you; if not, remove the wait for "ready"!
*
* @function vttThumbnails
* @param {Object} [options={}]
* An object of options left to the plugin author to define.
*/
const vttThumbnails = function(options) {
this.ready(() => {
onPlayerReady(this, videojs.mergeOptions(defaults, options));
});
};
/**
* VTT Thumbnails class.
*
* This class performs all functions related to displaying the vtt
* thumbnails.
*/
class vttThumbnailsPlugin {
/**
* Plugin class constructor, called by videojs on
* ready event.
*
* @function constructor
* @param {Player} player
* A Video.js player object.
*
* @param {Object} [options={}]
* A plain object containing options for the plugin.
*/
constructor(player, options) {
this.player = player;
this.options = options;
this.listenForDurationChange();
this.initializeThumbnails();
this.registeredEvents = {};
return this;
}
src(source) {
this.resetPlugin();
this.options.src = source;
this.initializeThumbnails();
}
detach() {
this.resetPlugin();
}
resetPlugin() {
if (this.thumbnailHolder) {
this.thumbnailHolder.parentNode.removeChild(this.thumbnailHolder);
}
if (this.progressBar) {
this.progressBar.removeEventListener('mouseenter', this.registeredEvents.progressBarMouseEnter);
this.progressBar.removeEventListener('mouseleave', this.registeredEvents.progressBarMouseLeave);
this.progressBar.removeEventListener('mousemove', this.registeredEvents.progressBarMouseMove);
}
delete this.registeredEvents.progressBarMouseEnter;
delete this.registeredEvents.progressBarMouseLeave;
delete this.registeredEvents.progressBarMouseMove;
delete this.progressBar;
delete this.vttData;
delete this.thumbnailHolder;
delete this.lastStyle;
}
listenForDurationChange() {
this.player.on('durationchange', () => {
});
}
/**
* Bootstrap the plugin.
*/
initializeThumbnails() {
if (!this.options.src) {
return;
}
const baseUrl = this.getBaseUrl();
const url = this.getFullyQualifiedUrl(this.options.src, baseUrl);
this.getVttFile(url)
.then((data) => {
this.vttData = this.processVtt(data);
this.setupThumbnailElement();
});
}
/**
* Builds a base URL should we require one.
*
* @return {string}
*/
getBaseUrl() {
return [
// eslint-disable-next-line no-undef
window.location.protocol,
'//',
// eslint-disable-next-line no-undef
window.location.hostname,
// eslint-disable-next-line no-undef
(window.location.port ? ':' + window.location.port : ''),
// eslint-disable-next-line no-undef
window.location.pathname
].join('').split(/([^\/]*)$/gi).shift();
}
/**
* Grabs the contents of the VTT file.
*
* @param url
* @return {Promise}
*/
getVttFile(url) {
return new Promise((resolve, reject) => {
// eslint-disable-next-line no-undef
const req = new XMLHttpRequest();
req.data = {
resolve
};
req.addEventListener('load', this.vttFileLoaded);
req.open('GET', url);
req.overrideMimeType('text/plain; charset=utf-8');
req.send();
});
}
/**
* Callback for loaded VTT file.
*/
vttFileLoaded() {
this.data.resolve(this.responseText);
}
setupThumbnailElement(data) {
let mouseDisplay = null;
if (!this.options.showTimestamp) {
mouseDisplay = this.player.$('.vjs-mouse-display');
}
// eslint-disable-next-line no-undef
const thumbHolder = document.createElement('div');
thumbHolder.setAttribute('class', 'vjs-vtt-thumbnail-display');
this.progressBar = this.player.$('.vjs-progress-control');
this.progressBar.appendChild(thumbHolder);
this.thumbnailHolder = thumbHolder;
if (mouseDisplay && !this.options.showTimestamp) {
mouseDisplay.classList.add('vjs-hidden');
}
this.registeredEvents.progressBarMouseEnter = () => {
return this.onBarMouseenter();
};
this.registeredEvents.progressBarMouseLeave = () => {
return this.onBarMouseleave();
};
this.progressBar.addEventListener('mouseenter', this.registeredEvents.progressBarMouseEnter);
this.progressBar.addEventListener('mouseleave', this.registeredEvents.progressBarMouseLeave);
}
onBarMouseenter() {
this.mouseMoveCallback = (e) => {
this.onBarMousemove(e);
};
this.registeredEvents.progressBarMouseMove = this.mouseMoveCallback;
this.progressBar.addEventListener('mousemove', this.registeredEvents.progressBarMouseMove);
this.showThumbnailHolder();
}
onBarMouseleave() {
if (this.registeredEvents.progressBarMouseMove) {
this.progressBar.removeEventListener('mousemove', this.registeredEvents.progressBarMouseMove);
}
this.hideThumbnailHolder();
}
getXCoord(bar, mouseX) {
const rect = bar.getBoundingClientRect();
// eslint-disable-next-line no-undef
const docEl = document.documentElement;
// eslint-disable-next-line no-undef
return mouseX - (rect.left + (window.pageXOffset || docEl.scrollLeft || 0));
}
onBarMousemove(event) {
this.updateThumbnailStyle(
videojs.dom.getPointerPosition(this.progressBar, event).x,
this.progressBar.offsetWidth
);
}
getStyleForTime(time) {
for (let i = 0; i < this.vttData.length; ++i) {
const item = this.vttData[i];
if (time >= item.start && time < item.end) {
// Cache miss
if (item.css.url && !cache[item.css.url]) {
// eslint-disable-next-line no-undef
const image = new Image();
image.src = item.css.url;
cache[item.css.url] = image;
}
return item.css;
}
}
}
showThumbnailHolder() {
this.thumbnailHolder.style.opacity = '1';
}
hideThumbnailHolder() {
this.thumbnailHolder.style.opacity = '0';
}
updateThumbnailStyle(percent, width) {
const duration = this.player.duration();
const time = percent * duration;
const currentStyle = this.getStyleForTime(time);
if (!currentStyle) {
return this.hideThumbnailHolder();
}
const xPos = percent * width;
const thumbnailWidth = parseInt(currentStyle.width, 10);
const halfthumbnailWidth = thumbnailWidth >> 1;
const marginRight = width - (xPos + halfthumbnailWidth);
const marginLeft = xPos - halfthumbnailWidth;
if (marginLeft > 0 && marginRight > 0) {
this.thumbnailHolder.style.transform = 'translateX(' + (xPos - halfthumbnailWidth) + 'px)';
} else if (marginLeft <= 0) {
this.thumbnailHolder.style.transform = 'translateX(' + 0 + 'px)';
} else if (marginRight <= 0) {
this.thumbnailHolder.style.transform = 'translateX(' + (width - thumbnailWidth) + 'px)';
}
if (this.lastStyle && this.lastStyle === currentStyle) {
return;
}
this.lastStyle = currentStyle;
for (const style in currentStyle) {
if (currentStyle.hasOwnProperty(style)) {
this.thumbnailHolder.style[style] = currentStyle[style];
}
}
}
processVtt(data) {
const processedVtts = [];
const vttDefinitions = data.split(/[\r\n][\r\n]/i);
vttDefinitions.forEach((vttDef) => {
if (vttDef.match(/([0-9]{2}:)?([0-9]{2}:)?[0-9]{2}(.[0-9]{3})?( ?--> ?)([0-9]{2}:)?([0-9]{2}:)?[0-9]{2}(.[0-9]{3})?[\r\n]{1}.*/gi)) {
const vttDefSplit = vttDef.split(/[\r\n]/i);
const vttTiming = vttDefSplit[0];
const vttTimingSplit = vttTiming.split(/ ?--> ?/i);
const vttTimeStart = vttTimingSplit[0];
const vttTimeEnd = vttTimingSplit[1];
const vttImageDef = vttDefSplit[1];
const vttCssDef = this.getVttCss(vttImageDef);
processedVtts.push({
start: this.getSecondsFromTimestamp(vttTimeStart),
end: this.getSecondsFromTimestamp(vttTimeEnd),
css: vttCssDef
});
}
});
return processedVtts;
}
getFullyQualifiedUrl(path, base) {
if (path.indexOf('//') >= 0) {
// We have a fully qualified path.
return path;
}
if (base.indexOf('//') === 0) {
// We don't have a fully qualified path, but need to
// be careful with trimming.
return [
base.replace(/\/$/gi, ''),
this.trim(path, '/')
].join('/');
}
if (base.indexOf('//') > 0) {
// We don't have a fully qualified path, and should
// trim both sides of base and path.
return [
this.trim(base, '/'),
this.trim(path, '/')
].join('/');
}
// If all else fails.
return path;
}
getPropsFromDef(def) {
const imageDefSplit = def.split(/#xywh=/i);
const imageUrl = imageDefSplit[0];
const imageCoords = imageDefSplit[1];
const splitCoords = imageCoords.match(/[0-9]+/gi);
return {
x: splitCoords[0],
y: splitCoords[1],
w: splitCoords[2],
h: splitCoords[3],
image: imageUrl
};
}
getVttCss(vttImageDef) {
const cssObj = {};
// If there isn't a protocol, use the VTT source URL.
let baseSplit;
if (this.options.src.indexOf('//') >= 0) {
baseSplit = this.options.src.split(/([^\/]*)$/gi).shift();
} else {
baseSplit = this.getBaseUrl() + this.options.src.split(/([^\/]*)$/gi).shift();
}
vttImageDef = this.getFullyQualifiedUrl(vttImageDef, baseSplit);
if (!vttImageDef.match(/#xywh=/i)) {
cssObj.background = 'url("' + vttImageDef + '")';
return cssObj;
}
const imageProps = this.getPropsFromDef(vttImageDef);
cssObj.background = 'url("' + imageProps.image + '") no-repeat -' + imageProps.x + 'px -' + imageProps.y + 'px';
cssObj.width = imageProps.w + 'px';
cssObj.height = imageProps.h + 'px';
cssObj.url = imageProps.image;
return cssObj;
}
/**
* deconstructTimestamp deconstructs a VTT timestamp
*
* @param {string} timestamp VTT timestamp
* @return {Object} deconstructed timestamp
*/
deconstructTimestamp(timestamp) {
const splitStampMilliseconds = timestamp.split('.');
const timeParts = splitStampMilliseconds[0];
const timePartsSplit = timeParts.split(':');
return {
milliseconds: parseInt(splitStampMilliseconds[1], 10) || 0,
seconds: parseInt(timePartsSplit.pop(), 10) || 0,
minutes: parseInt(timePartsSplit.pop(), 10) || 0,
hours: parseInt(timePartsSplit.pop(), 10) || 0
};
}
/**
* getSecondsFromTimestamp
*
* @param {string} timestamp VTT timestamp
* @return {number} timestamp in seconds
*/
getSecondsFromTimestamp(timestamp) {
const timestampParts = this.deconstructTimestamp(timestamp);
return parseInt((timestampParts.hours * (60 * 60)) +
(timestampParts.minutes * 60) +
timestampParts.seconds +
(timestampParts.milliseconds / 1000), 10);
}
/**
* trim
*
* @param {string} str source string
* @param {string} charlist characters to trim from text
* @return {string} trimmed string
*/
trim(str, charlist) {
let whitespace = [
' ',
'\n',
'\r',
'\t',
'\f',
'\x0b',
'\xa0',
'\u2000',
'\u2001',
'\u2002',
'\u2003',
'\u2004',
'\u2005',
'\u2006',
'\u2007',
'\u2008',
'\u2009',
'\u200a',
'\u200b',
'\u2028',
'\u2029',
'\u3000'
].join('');
let l = 0;
let i = 0;
str += '';
if (charlist) {
whitespace = (charlist + '').replace(/([[\]().?/*{}+$^:])/g, '$1');
}
l = str.length;
for (i = 0; i < l; i++) {
if (whitespace.indexOf(str.charAt(i)) === -1) {
str = str.substring(i);
break;
}
}
l = str.length;
for (i = l - 1; i >= 0; i--) {
if (whitespace.indexOf(str.charAt(i)) === -1) {
str = str.substring(0, i + 1);
break;
}
}
return whitespace.indexOf(str.charAt(0)) === -1 ? str : '';
}
}
// Register the plugin with video.js.
registerPlugin('vttThumbnails', vttThumbnails);
// Include the version number.
vttThumbnails.VERSION = VERSION;
export default vttThumbnails;