e948bfd585
- Allow jpeg sprites - much snappier and more accurate - Fixed bug: right clicking the seek bar sticks on mousedown - Fixed bug: moving the mouse really quickly results in not updating the thumb - Fixed bug: if you mousedown but don't move mouse, it shows a stale image in the scrubbing container - Fixed bug: very first image shows as 0px - Fixed bug: stretches images when video isn't same aspect as player
592 lines
26 KiB
JavaScript
592 lines
26 KiB
JavaScript
import { formatTime } from '../utils/time';
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import { on, once, toggleListener, triggerEvent } from '../utils/events';
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import { createElement, emptyElement, getAttributesFromSelector, getElement, getElements, hasClass, matches, removeElement, setAttributes, setFocus, toggleClass, toggleHidden } from '../utils/elements';
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import fetch from '../utils/fetch';
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/**
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* Preview thumbnails for seek hover and scrubbing
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* Seeking: Hover over the seek bar (desktop only): shows a small preview container above the seek bar
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* Scrubbing: Click and drag the seek bar (desktop and mobile): shows the preview image over the entire video, as if the video is scrubbing at very high speed
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*
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* Notes:
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* - Thumbs are set via JS settings on Plyr init, not HTML5 'track' property. Using the track property would be a bit gross, because it doesn't support custom 'kinds'. kind=metadata might be used for something else, and we want to allow multiple thumbnails tracks. Tracks must have a unique combination of 'kind' and 'label'. We would have to do something like kind=metadata,label=thumbnails1 / kind=metadata,label=thumbnails2. Square peg, round hole
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* - VTT info: the image URL is relative to the VTT, not the current document. But if the url starts with a slash, it will naturally be relative to the current domain. https://support.jwplayer.com/articles/how-to-add-preview-thumbnails
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* - This implementation uses multiple separate img elements. Other implementations use background-image on one element. This would be nice and simple, but Firefox and Safari have flickering issues with replacing backgrounds of larger images. It seems that Youtube perhaps only avoids this because they don't have the option for high-res previews (even the fullscreen ones, when mousedown/seeking). Images appear over the top of each other, and previous ones are discarded once the new ones have been rendered
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*/
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class PreviewThumbnails {
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/**
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* PreviewThumbnails constructor.
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* @param {object} player
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* @return {PreviewThumbnails}
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*/
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constructor(player) {
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this.player = player;
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this.thumbnailsDefs = [];
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this.lastMousemoveEventTime = Date.now();
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this.mouseDown = false;
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this.loadedImages = [];
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if (this.enabled) {
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this.load();
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}
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}
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get enabled() {
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return (
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this.player.isHTML5 &&
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this.player.isVideo &&
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this.player.config.previewThumbnails.enabled
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);
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}
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load() {
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// Turn off the regular seek tooltip
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this.player.config.tooltips.seek = false;
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this.getThumbnailsDefs()
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.then(() => {
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// Initiate DOM listeners so that our preview thumbnails can be used
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this.listeners();
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// Build HTML DOM elements
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this.elements();
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// Check to see if thumb container size was specified manually in CSS
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this.determineContainerAutoSizing();
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});
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}
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// Download VTT files and parse them
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getThumbnailsDefs() {
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return new Promise((resolve, reject) => {
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if (!this.player.config.previewThumbnails.src) {
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throw new Error('Missing previewThumbnails.src config attribute');
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}
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// previewThumbnails.src can be string or list. If string, convert into single-element list
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const configSrc = this.player.config.previewThumbnails.src
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const urls = typeof configSrc === 'string' ? [configSrc] : configSrc
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const promises = [];
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// Loop through each src url. Download and process the VTT file, storing the resulting data in this.thumbnailsDefs
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for (const url of urls) {
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promises.push(this.getThumbnailDef(url));
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}
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Promise.all(promises)
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.then(() => {
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// Sort smallest to biggest (e.g., [120p, 480p, 1080p])
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this.thumbnailsDefs.sort((x, y) => x.height - y.height)
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this.player.debug.log('Preview thumbnails: thumbnailsDefs: ' + JSON.stringify(this.thumbnailsDefs, null, 4))
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resolve()
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});
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})
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}
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// Process individual VTT file
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getThumbnailDef(url) {
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return new Promise((resolve, reject) => {
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fetch(url)
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.then(response => {
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const thumbnailsDef = {
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frames: this.parseVtt(response),
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height: null,
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urlPrefix: '',
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};
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// If the URLs don't start with '/', then we need to set their relative path to be the location of the VTT file
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// If the URLs do start with '/', then they obviously don't need a prefix, so it will remain blank
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if (!thumbnailsDef.frames[0].text.startsWith('/')) {
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thumbnailsDef.urlPrefix = url.substring(0, url.lastIndexOf('/') + 1);
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}
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// Download the first frame, so that we can determine/set the height of this thumbnailsDef
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const tempImage = new Image();
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tempImage.src = thumbnailsDef.urlPrefix + thumbnailsDef.frames[0].text;
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tempImage.onload = () => {
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thumbnailsDef.height = tempImage.naturalHeight;
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thumbnailsDef.width = tempImage.naturalWidth;
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this.thumbnailsDefs.push(thumbnailsDef);
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resolve();
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}
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})
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})
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}
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/**
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* Setup hooks for Plyr and window events
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*/
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listeners() {
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// Mouse hover over seek bar
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on.call(
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this.player,
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this.player.elements.progress,
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'mousemove',
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event => {
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// Wait until media has a duration
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if (this.player.media.duration) {
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// Calculate seek hover position as approx video seconds
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const clientRect = this.player.elements.progress.getBoundingClientRect();
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const percentage = 100 / clientRect.width * (event.pageX - clientRect.left);
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this.seekTime = this.player.media.duration * (percentage / 100);
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if (this.seekTime < 0) this.seekTime = 0; // The mousemove fires for 10+px out to the left
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if (this.seekTime > this.player.media.duration - 1) this.seekTime = this.player.media.duration - 1; // Took 1 second off the duration for safety, because different players can disagree on the real duration of a video
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this.mousePosX = event.pageX;
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// Set time text inside image container
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this.player.elements.display.previewThumbnailTimeText.innerText = formatTime(this.seekTime);
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// Download and show image
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this.showImageAtCurrentTime();
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}
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}
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);
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// Touch device seeking - performs same function as above
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on.call(
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this.player,
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this.player.elements.progress,
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'touchmove',
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event => {
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// Wait until media has a duration
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if (this.player.media.duration) {
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// Calculate seek hover position as approx video seconds
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this.seekTime = this.player.media.duration * (this.player.elements.inputs.seek.value / 100);
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// Download and show image
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this.showImageAtCurrentTime();
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}
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}
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);
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// Hide thumbnail preview - on mouse click, mouse leave, and video play/seek. All four are required, e.g., for buffering
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on.call(
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this.player,
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this.player.elements.progress,
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'mouseleave click',
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() => {
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this.hideThumbContainer(true);
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}
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);
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this.player.on('play', () => {
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this.hideThumbContainer(true);
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});
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this.player.on('seeked', () => {
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this.hideThumbContainer(false);
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});
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// Show scrubbing preview
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on.call(
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this.player,
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this.player.elements.progress,
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'mousedown touchstart',
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event => {
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// Only act on left mouse button (0)
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if (event.button === 0) {
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this.mouseDown = true;
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// Wait until media has a duration
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if (this.player.media.duration) {
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this.showScrubbingContainer();
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this.hideThumbContainer(false);
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// Download and show image
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this.showImageAtCurrentTime();
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}
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}
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}
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);
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on.call(
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this.player,
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this.player.media,
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'timeupdate',
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() => {
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this.timeAtLastTimeupdate = this.player.media.currentTime;
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}
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);
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on.call(
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this.player,
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this.player.elements.progress,
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'mouseup touchend',
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() => {
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this.mouseDown = false;
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// Hide scrubbing preview. But wait until the video has successfully seeked before hiding the scrubbing preview
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if (Math.ceil(this.timeAtLastTimeupdate) === Math.ceil(this.player.media.currentTime)) {
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// The video was already seeked/loaded at the chosen time - hide immediately
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this.hideScrubbingContainer();
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} else {
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// The video hasn't seeked yet. Wait for that
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once.call(
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this.player,
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this.player.media,
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'timeupdate',
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() => {
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// Re-check mousedown - we might have already started scrubbing again
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if (!this.mouseDown) {
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this.hideScrubbingContainer();
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}
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}
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);
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}
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}
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);
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}
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/**
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* Create HTML elements for image containers
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*/
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elements() {
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// Create HTML element: plyr__preview-thumbnail-container
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const previewThumbnailContainer = createElement(
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'div',
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{
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class: this.player.config.classNames.previewThumbnailContainer,
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},
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);
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this.player.elements.progress.appendChild(previewThumbnailContainer);
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this.player.elements.display.previewThumbnailContainer = previewThumbnailContainer;
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const timeText = createElement(
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'span',
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{},
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'00:00',
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);
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this.player.elements.display.previewThumbnailContainer.appendChild(timeText);
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this.player.elements.display.previewThumbnailTimeText = timeText;
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// Create HTML element: plyr__preview-scrubbing-container
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const previewScrubbingContainer = createElement(
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'div',
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{
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class: this.player.config.classNames.previewScrubbingContainer,
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},
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);
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this.player.elements.wrapper.appendChild(previewScrubbingContainer);
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this.player.elements.display.previewScrubbingContainer = previewScrubbingContainer;
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}
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showImageAtCurrentTime() {
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if (this.mouseDown) {
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this.setScrubbingContainerSize();
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} else {
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this.showThumbContainer();
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this.setThumbContainerSizeAndPos();
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}
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// // TODO: move this logic to
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// Check when we last loaded an image - don't show more than one new one every 500ms
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// if (this.lastMousemoveEventTime < Date.now() - 150) {
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// this.lastMousemoveEventTime = Date.now();
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// Find the desired thumbnail index
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const thumbNum = this.thumbnailsDefs[0].frames.findIndex(frame => this.seekTime >= frame.startTime && this.seekTime <= frame.endTime);
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let qualityIndex = 0;
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// Check to see if we've already downloaded higher quality versions of this image
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for (let i = 1; i < this.thumbnailsDefs.length; i++) {
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if (this.loadedImages.includes(this.thumbnailsDefs[i].frames[thumbNum].text)) {
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qualityIndex = i;
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}
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}
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// Only proceed if either thumbnum or thumbfilename has changed
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if (thumbNum !== this.showingThumb) {
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this.showingThumb = thumbNum;
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this.loadImage(qualityIndex);
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}
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// } else {
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// // Set a timeout so that we always fire this function once after the mouse stops moving. If not for this, the mouse preview would often be a bit stale
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// if (this.mousemoveEventTimeout) {
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// clearTimeout(this.mousemoveEventTimeout);
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// }
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// this.mousemoveEventTimeout = setTimeout(() => {
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// // Don't follow through after the timeout if it's since been hidden
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// if (this.player.elements.display.previewThumbnailContainer.style.opacity === '1') {
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// console.log('show on timer')
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// this.showImageAtCurrentTime(true);
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// this.mousemoveEventTimeout = null;
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// }
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// }, 200)
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// }
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}
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// Show the image that's currently specified in this.showingThumb
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loadImage(qualityIndex = 0) {
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let thumbNum = this.showingThumb;
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this.player.debug.log(`Preview thumbnails: showing thumbnum: ${thumbNum}: ${JSON.stringify(this.thumbnailsDefs[qualityIndex].frames[thumbNum])}`);
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const frame = this.thumbnailsDefs[qualityIndex].frames[thumbNum];
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const thumbFilename = this.thumbnailsDefs[qualityIndex].frames[thumbNum].text;
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const urlPrefix = this.thumbnailsDefs[qualityIndex].urlPrefix;
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const thumbURL = urlPrefix + thumbFilename;
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// console.log('loading: ' + thumbFilename + '. num: ' + thumbNum + '. qual: ' + qualityIndex);
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if (!this.currentImageElement || this.currentImageElement.getAttribute('data-thumbfilename') !== thumbFilename) {
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// If we're already loading a previous image, remove its onload handler - we don't want it to load after this one
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// Only do this if not using jpeg sprites. Without jpeg sprites we really want to show as many images as possible, as a best-effort
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if (this.loadingImage && this.usingJpegSprites) this.loadingImage.onload = null;
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// We're building and adding a new image. In other implementations of similar functionality (Youtube), background image is instead used. But this causes issues with larger images in Firefox and Safari - switching between background images causes a flicker. Putting a new image over the top does not
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const previewImage = new Image();
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previewImage.src = thumbURL;
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previewImage.setAttribute('data-thumbnum', thumbNum);
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previewImage.setAttribute('data-thumbfilename', thumbFilename);
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// this.showingThumbFilename = this.thumbnailsDefs[qualityIndex].frames[thumbNum].text;
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this.showingThumbFilename = thumbFilename;
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// For some reason, passing the named function directly causes it to execute immediately. So I've wrapped it in an anonymous function...
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previewImage.onload = () => this.showImage(previewImage, frame, qualityIndex, thumbNum, thumbFilename, true);
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this.loadingImage = previewImage;
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this.removeOldImages(previewImage);
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} else {
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// Update the existing image
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this.showImage(this.currentImageElement, frame, qualityIndex, thumbNum, thumbFilename, false);
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this.currentImageElement.setAttribute('data-thumbnum', thumbNum);
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this.removeOldImages(this.currentImageElement);
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}
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}
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showImage(previewImage, frame, qualityIndex, thumbNum, thumbFilename, newImage = true) {
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// console.log('newimage: ' + newImage)
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console.log('showing: ' + thumbFilename + '. num: ' + thumbNum + '. qual: ' + qualityIndex + '. newimg: ' + newImage);
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this.setImageSizeAndOffset(previewImage, frame);
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if (newImage) {
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this.currentContainer.appendChild(previewImage);
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this.currentImageElement = previewImage;
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// this.removeOldImages(previewImage);
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if (!this.loadedImages.includes(thumbFilename)) this.loadedImages.push(thumbFilename);
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}
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// Look for a higher quality version of the same frame
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if (qualityIndex < this.thumbnailsDefs.length - 1) {
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// Only use the higher quality version if it's going to look any better - if the current thumb is of a lower pixel density than the thumbnail container
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// let previewContainerHeight = this.player.elements.display.previewThumbnailContainer.clientHeight;
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// if (this.mouseDown) previewContainerHeight = this.player.elements.display.previewScrubbingContainer.clientHeight;
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// // Adjust for HiDPI screen
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// if (window.devicePixelRatio) previewContainerHeight *= window.devicePixelRatio;
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// if (previewImage.naturalHeight < previewContainerHeight) {
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// Recurse this function - show a higher quality one, but only if the viewer is on this frame for a while
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setTimeout(() => {
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// Make sure the mouse hasn't already moved on and started hovering at another frame
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// TODO: need to use filename instead of thumbnum, but need to use latest thumbnum instead of old thumbnum
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// if (this.showingThumb === thumbNum) {
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console.log(`${this.showingThumbFilename} ${thumbFilename}`)
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if (this.showingThumbFilename === thumbFilename) {
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// console.log('showing higher qual')
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this.loadImage(qualityIndex + 1);
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}
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}, 500)
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// }
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}
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}
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removeOldImages(currentImage) {
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// Get a list of all images, and reverse it - so that we can start from the end and delete all except for the most recent
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const allImages = [...this.currentContainer.children];
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for (let image of allImages) {
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if (image.tagName === 'IMG') {
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const removeDelay = this.usingJpegSprites ? 200 : 1000;
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if (image.getAttribute('data-thumbnum') !== currentImage.getAttribute('data-thumbnum') && !image.getAttribute('data-deleting')) {
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// Wait 200ms, as the new image can take some time to show on certain browsers (even though it was downloaded before showing). This will prevent flicker, and show some generosity towards slower clients
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// First set attribute 'deleting' to prevent multi-handling of this on repeat firing of this function
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image.setAttribute('data-deleting', 'true');
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setTimeout(() => {
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this.currentContainer.removeChild(image);
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// console.log('removing: ' + image.getAttribute('data-thumbfilename'));
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}, removeDelay)
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}
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}
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}
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}
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get currentContainer() {
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if (this.mouseDown) {
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return this.player.elements.display.previewScrubbingContainer;
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} else {
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return this.player.elements.display.previewThumbnailContainer;
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}
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}
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get usingJpegSprites() {
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if (this.thumbnailsDefs[0].frames[0].w) {
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return true;
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} else {
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return false;
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}
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}
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get thumbAspectRatio() {
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if (this.usingJpegSprites) {
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return this.thumbnailsDefs[0].frames[0].w / this.thumbnailsDefs[0].frames[0].h;
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} else {
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return this.thumbnailsDefs[0].width / this.thumbnailsDefs[0].height;
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}
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}
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get thumbContainerHeight() {
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if (this.mouseDown) {
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// return this.player.elements.container.clientHeight;
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// return this.player.media.clientHeight;
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return this.player.media.clientWidth / this.thumbAspectRatio; // Can't use media.clientHeight - html5 video goes big and does black bars above and below
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} else {
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// return this.player.elements.container.clientHeight / 4;
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return this.player.media.clientWidth / this.thumbAspectRatio / 4;
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}
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}
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get currentImageElement() {
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if (this.mouseDown) {
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return this.currentScrubbingImageElement;
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} else {
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return this.currentThumbnailImageElement;
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}
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}
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set currentImageElement(element) {
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if (this.mouseDown) {
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this.currentScrubbingImageElement = element;
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} else {
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this.currentThumbnailImageElement = element;
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}
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}
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showThumbContainer() {
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this.player.elements.display.previewThumbnailContainer.style.opacity = 1;
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}
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hideThumbContainer(clearShowing = false) {
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this.player.elements.display.previewThumbnailContainer.style.opacity = 0;
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if (clearShowing) {
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this.showingThumb = null;
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this.showingThumbFilename = null;
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}
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}
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showScrubbingContainer() {
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this.player.elements.display.previewScrubbingContainer.style.opacity = 1;
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}
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hideScrubbingContainer() {
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this.player.elements.display.previewScrubbingContainer.style.opacity = 0;
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this.showingThumb = null;
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this.showingThumbFilename = null;
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}
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determineContainerAutoSizing() {
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if (this.player.elements.display.previewThumbnailContainer.clientHeight > 20) {
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this.sizeSpecifiedInCSS = true; // This will prevent auto sizing in this.setThumbContainerSizeAndPos()
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}
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}
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|
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// Set the size to be about a quarter of the size of video. Unless option dynamicSize === false, in which case it needs to be set in CSS
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setThumbContainerSizeAndPos() {
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if (!this.sizeSpecifiedInCSS) {
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const thumbWidth = this.thumbContainerHeight * this.thumbAspectRatio;
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this.player.elements.display.previewThumbnailContainer.style.height = `${this.thumbContainerHeight}px`;
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this.player.elements.display.previewThumbnailContainer.style.width = `${thumbWidth}px`;
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}
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|
|
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this.setThumbContainerPos();
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|
}
|
|
|
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setThumbContainerPos() {
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|
const seekbarRect = this.player.elements.progress.getBoundingClientRect();
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const plyrRect = this.player.elements.container.getBoundingClientRect();
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const previewContainer = this.player.elements.display.previewThumbnailContainer;
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|
|
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// Find the lowest and highest desired left-position, so we don't slide out the side of the video container
|
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const minVal = (plyrRect.left - seekbarRect.left + 10);
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|
const maxVal = (plyrRect.right - seekbarRect.left - (previewContainer.clientWidth) - 10);
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|
|
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// Set preview container position to: mousepos, minus seekbar.left, minus half of previewContainer.clientWidth
|
|
let previewPos = this.mousePosX - seekbarRect.left - (previewContainer.clientWidth / 2);
|
|
if (previewPos < minVal) {
|
|
previewPos = minVal;
|
|
}
|
|
if (previewPos > maxVal) {
|
|
previewPos = maxVal;
|
|
}
|
|
previewContainer.style.left = previewPos + 'px';
|
|
}
|
|
|
|
// Can't use 100% width, in case the video is a different aspect ratio to the video container
|
|
setScrubbingContainerSize() {
|
|
this.player.elements.display.previewScrubbingContainer.style.width = `${this.player.media.clientWidth}px`;
|
|
this.player.elements.display.previewScrubbingContainer.style.height = `${this.player.media.clientWidth/this.thumbAspectRatio}px`; // Can't use media.clientHeight - html5 video goes big and does black bars above and below
|
|
}
|
|
|
|
// Jpeg sprites need to be offset to the correct location
|
|
setImageSizeAndOffset(previewImage, frame) {
|
|
if (this.usingJpegSprites) {
|
|
// Find difference between jpeg height and preview container height
|
|
const heightMulti = this.thumbContainerHeight / frame.h;
|
|
|
|
previewImage.style.height = `${previewImage.naturalHeight * heightMulti}px`;
|
|
previewImage.style.width = `${previewImage.naturalWidth * heightMulti}px`;
|
|
previewImage.style.left = `-${Math.ceil(frame.x * heightMulti)}px`;
|
|
previewImage.style.top = `-${frame.y * heightMulti}px`; // todo: might need to round this one up too
|
|
}
|
|
}
|
|
|
|
// Arg: vttDataString example: "WEBVTT\n\n1\n00:00:05.000 --> 00:00:10.000\n1080p-00001.jpg"
|
|
parseVtt(vttDataString) {
|
|
const processedList = [];
|
|
const frames = vttDataString.split(/\r\n\r\n|\n\n|\r\r/);
|
|
|
|
for (const frame of frames) {
|
|
const result = {};
|
|
|
|
for (const line of frame.split(/\r\n|\n|\r/)) {
|
|
if (result.startTime == null) {
|
|
// The line with start and end times on it is the first line of interest
|
|
const matchTimes = line.match(/([0-9]{2}):([0-9]{2}):([0-9]{2}).([0-9]{2,3})( ?--> ?)([0-9]{2}):([0-9]{2}):([0-9]{2}).([0-9]{2,3})/) // Note that this currently ignores caption formatting directives that are optionally on the end of this line - fine for non-captions VTT
|
|
|
|
if (matchTimes) {
|
|
result.startTime = Number(matchTimes[1]) * 60 * 60 + Number(matchTimes[2]) * 60 + Number(matchTimes[3]) + Number("0." + matchTimes[4])
|
|
result.endTime = Number(matchTimes[6]) * 60 * 60 + Number(matchTimes[7]) * 60 + Number(matchTimes[8]) + Number("0." + matchTimes[9])
|
|
}
|
|
} else {
|
|
// If we already have the startTime, then we're definitely up to the text line(s)
|
|
if (line.trim().length > 0) {
|
|
if (!result.text) {
|
|
const lineSplit = line.trim().split('#xywh=');
|
|
result.text = lineSplit[0];
|
|
|
|
// If there's content in lineSplit[1], then we have jpeg sprites. If not, then it's just one frame per jpeg
|
|
if (lineSplit[1]) {
|
|
const xywh = lineSplit[1].split(',');
|
|
result.x = xywh[0];
|
|
result.y = xywh[1];
|
|
result.w = xywh[2];
|
|
result.h = xywh[3];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (result.text) {
|
|
processedList.push(result);
|
|
}
|
|
}
|
|
|
|
return processedList;
|
|
}
|
|
}
|
|
|
|
export default PreviewThumbnails;
|