Preview seek/scrubbing thumbnails
This commit is contained in:
James
parent
7d484c6e09
commit
8f27611911
@ -342,6 +342,8 @@ const defaults = {
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loading: 'plyr--loading',
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hover: 'plyr--hover',
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tooltip: 'plyr__tooltip',
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previewThumbnailContainer: 'plyr__preview-thumbnail-container',
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previewScrubbingContainer: 'plyr__preview-scrubbing-container',
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cues: 'plyr__cues',
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hidden: 'plyr__sr-only',
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hideControls: 'plyr--hide-controls',
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@ -395,6 +397,11 @@ const defaults = {
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enabled: false,
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publisherId: '',
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},
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// Preview Thumbnails plugin
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previewThumbnails: {
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enabled: false,
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}
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};
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export default defaults;
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499
src/js/plugins/previewThumbnails.js
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499
src/js/plugins/previewThumbnails.js
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@ -0,0 +1,499 @@
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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.showingThumb = null; // Index of the currently displayed thumbnail
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this.lastMousemoveEventTime = Date.now();
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this.mouseDown = false;
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this.imageShowCounter = 0;
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this.imageTryShowCounter = 0;
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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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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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// Turn off the regular seek tooltip
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this.player.config.tooltips.seek = false;
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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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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();
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}
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);
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this.player.on('play', () => {
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this.hideThumbContainer();
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});
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this.player.on('seeked', () => {
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this.hideThumbContainer();
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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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() => {
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this.mouseDown = true;
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this.showScrubbingContainer();
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this.hideThumbContainer();
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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.showThumbContainer();
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}
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this.setThumbContainerSizeAndPos();
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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 first thumbnail that's after `time`. Note `this.seekTime+1` - we're actually looking 1 second ahead, because it's more likely then that the viewer will actually get to see the preview frame in the actual video. This hack should be removed if we ever choose to make it seek to the nearest thumb time
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const thumbNum = this.thumbnailsDefs[0].frames.findIndex(frame => this.seekTime+1 >= frame.startTime && this.seekTime <= frame.endTime);
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// Only show if the thumbnail to show is different to last time
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if (thumbNum !== this.showingThumb) {
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this.showingThumb = thumbNum;
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this.showImage();
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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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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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this.showImageAtCurrentTime();
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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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}
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// Show the image that's currently specified in this.showingThumb
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showImage (qualityIndex = 0) {
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this.imageTryShowCounter += 1;
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const localImageTryShowCounter = this.imageTryShowCounter;
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let thumbNum = this.showingThumb;
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if (thumbNum === this.thumbnailsDefs[qualityIndex].frames.length) {
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// It can attempt to preview up to 5 seconds out past the end of the video. So we'll just show the last frame
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thumbNum -= 1;
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this.showingThumb = thumbNum;
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}
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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 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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// 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.onload = () => {
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// Many images are loaded within milliseconds of each other. An earlier one might be the last one to finish loading. Make sure we don't show an images out of order
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if (localImageTryShowCounter >= this.imageShowCounter) {
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this.imageShowCounter = localImageTryShowCounter;
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this.currentContainer.appendChild(previewImage);
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// Now that this one is showing, start pre-loading a batch of nearby images. But only if this isn't a revisit
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// this.preloadNearbyImages(thumbNum);
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this.thumbnailsDefs[qualityIndex].frames[thumbNum].loaded = true
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this.removeOldImages();
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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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if (this.showingThumb === thumbNum) {
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this.showImage(qualityIndex + 1);
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}
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}, 150)
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}
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}
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}
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}
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}
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// Not using this -- Preloading looked like maybe a good idea, but it seems to actually cause more trouble than it solves. Slow connections get really backed up. Fast connections don't really need it
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// If we were to try using this again, we might need to look at not starting a second preload while another is still going?
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preloadNearbyImages(thumbNum, amountToPreload=30) {
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const actualShowingThumb = [...this.currentContainer.children].reverse()[0].getAttribute('data-thumbnum');
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if (actualShowingThumb && Number(actualShowingThumb) === this.showingThumb) {
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let startNum = thumbNum - amountToPreload/2;
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let endNum = thumbNum + amountToPreload/2;
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if (startNum < 0) startNum = 0;
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if (endNum > this.thumbnailsDefs[0].frames.length - 1) endNum = this.thumbnailsDefs[0].frames.length - 1;
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for (let i = startNum; i <= endNum; i++) {
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if (!this.thumbnailsDefs[0].frames[i].loaded) {
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this.player.debug.log('Thumbnail previews: preloading: ' + i);
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const thumbFilename = this.thumbnailsDefs[0].frames[i].text;
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const urlPrefix = this.thumbnailsDefs[0].urlPrefix;
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const thumbURL = urlPrefix + thumbFilename;
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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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// Set loaded attribute. This will prevent us from wasting CPU constantly trying to preload images that we already have loaded
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this.thumbnailsDefs[0].frames[i].loaded = true;
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}
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}
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}
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}
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removeOldImages() {
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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].reverse();
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// Start at the third image image - so we leave the last two images. Leaving only one might result in flickering if the newest one hasn't finished rendering yet
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for (let i = 2; i < allImages.length; i++) {
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if (allImages[i].tagName === 'IMG') {
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this.currentContainer.removeChild(allImages[i]);
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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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showThumbContainer() {
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this.player.elements.display.previewThumbnailContainer.style.opacity = 1;
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}
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hideThumbContainer() {
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this.player.elements.display.previewThumbnailContainer.style.opacity = 0;
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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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}
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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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|
||||
// 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
|
||||
setThumbContainerSizeAndPos() {
|
||||
// if (this.player.config.previewThumbnails.autoSize) {
|
||||
if (!this.sizeSpecifiedInCSS) {
|
||||
const videoAspectRatio = this.player.media.videoWidth / this.player.media.videoHeight;
|
||||
const thumbHeight = this.player.elements.container.clientHeight / 4;
|
||||
const thumbWidth = thumbHeight * videoAspectRatio;
|
||||
this.player.elements.display.previewThumbnailContainer.style.height = `${thumbHeight}px`;
|
||||
this.player.elements.display.previewThumbnailContainer.style.width = `${thumbWidth}px`;
|
||||
}
|
||||
|
||||
this.setThumbContainerPos();
|
||||
}
|
||||
|
||||
setThumbContainerPos() {
|
||||
const seekbarRect = this.player.elements.progress.getBoundingClientRect();
|
||||
const plyrRect = this.player.elements.container.getBoundingClientRect();
|
||||
const previewContainer = this.player.elements.display.previewThumbnailContainer;
|
||||
|
||||
// Find the lowest and highest desired left-position, so we don't slide out the side of the video container
|
||||
const minVal = (plyrRect.left - seekbarRect.left + 10);
|
||||
const maxVal = (plyrRect.right - seekbarRect.left - (previewContainer.clientWidth) - 10);
|
||||
|
||||
// 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';
|
||||
}
|
||||
|
||||
// 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) {
|
||||
result.text = line.trim()
|
||||
} else {
|
||||
result.text += '\n' + line.trim()
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (result.text) {
|
||||
processedList.push(result)
|
||||
}
|
||||
}
|
||||
|
||||
return processedList
|
||||
}
|
||||
}
|
||||
|
||||
export default PreviewThumbnails;
|
||||
@ -15,6 +15,7 @@ import Fullscreen from './fullscreen';
|
||||
import Listeners from './listeners';
|
||||
import media from './media';
|
||||
import Ads from './plugins/ads';
|
||||
import PreviewThumbnails from './plugins/previewThumbnails';
|
||||
import source from './source';
|
||||
import Storage from './storage';
|
||||
import support from './support';
|
||||
@ -306,6 +307,11 @@ class Plyr {
|
||||
|
||||
// Seek time will be recorded (in listeners.js) so we can prevent hiding controls for a few seconds after seek
|
||||
this.lastSeekTime = 0;
|
||||
|
||||
// Setup preview thumbnails if enabled
|
||||
if (this.config.previewThumbnails.enabled) {
|
||||
this.previewThumbnails = new PreviewThumbnails(this);
|
||||
}
|
||||
}
|
||||
|
||||
// ---------------------------------------
|
||||
|
||||
70
src/sass/plugins/previewThumbnails.scss
Normal file
70
src/sass/plugins/previewThumbnails.scss
Normal file
@ -0,0 +1,70 @@
|
||||
// --------------------------------------------------------------
|
||||
// Preview Thumbnails
|
||||
// --------------------------------------------------------------
|
||||
|
||||
.plyr__preview-thumbnail-container {
|
||||
background-color: rgba(0,0,0,0.5);
|
||||
border: 1px solid rgba(0,0,0,0); // The background colour above applies to the area under the border - so appears to be a border of 0.5 opacity black
|
||||
border-radius: 0px;
|
||||
bottom: 100%;
|
||||
box-shadow: $plyr-tooltip-shadow;
|
||||
left: 50%;
|
||||
line-height: 1.3;
|
||||
margin-bottom: $plyr-tooltip-padding * 2;
|
||||
opacity: 0;
|
||||
pointer-events: none;
|
||||
position: absolute;
|
||||
transition: opacity 0.2s 0.1s ease;
|
||||
white-space: nowrap;
|
||||
z-index: 2;
|
||||
|
||||
img {
|
||||
position: absolute;
|
||||
left: 0px;
|
||||
right: 0px;
|
||||
top: 0px;
|
||||
bottom: 0px;
|
||||
margin: auto;
|
||||
height: 100%;
|
||||
width: 100%;
|
||||
border-radius: 0px;
|
||||
}
|
||||
|
||||
// Seek time text
|
||||
span {
|
||||
position: absolute;
|
||||
bottom: 0px;
|
||||
z-index: 3;
|
||||
transform: translate(-50%,0);
|
||||
background-color: rgba(0,0,0,0.55);
|
||||
color: rgba(255,255,255,1);
|
||||
padding: 4px 6px 3px 6px;
|
||||
font-size: $plyr-font-size-small;
|
||||
font-weight: $plyr-font-weight-regular;
|
||||
}
|
||||
}
|
||||
|
||||
.plyr__preview-scrubbing-container {
|
||||
position: absolute;
|
||||
left: 0px;
|
||||
right: 0px;
|
||||
top: 0px;
|
||||
bottom: 0px;
|
||||
height: 100%;
|
||||
width: 100%;
|
||||
z-index: 1;
|
||||
transition: opacity 0.3s 0.3s ease;
|
||||
filter: blur(1px);
|
||||
|
||||
img {
|
||||
position: absolute;
|
||||
left: 0px;
|
||||
right: 0px;
|
||||
top: 0px;
|
||||
bottom: 0px;
|
||||
margin: auto;
|
||||
height: 100%;
|
||||
width: 100%;
|
||||
object-fit: contain;
|
||||
}
|
||||
}
|
||||
@ -42,6 +42,7 @@
|
||||
@import 'states/fullscreen';
|
||||
|
||||
@import 'plugins/ads';
|
||||
@import 'plugins/previewThumbnails';
|
||||
|
||||
@import 'utils/animation';
|
||||
@import 'utils/hidden';
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user