H5视频播放器开发-拦截chrome插件Video Speed Controller的广告快进功能

最新更新时间：2019年1月10日19:34:50

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本文内容：chrome插件、视频快进

概述

视频网站vip会员可以跳过广告，但非vip会员必须欣赏广告。视频厂商的口号是将广告进行到底！！！

问题背景

神奇的chrome浏览器，支持第三方插件安装，Video Speed Controller插件具有强大的功能，比如：快进广告，60s广告秒秒钟over

获取这个插件点击这里

播放器内核拦截非法功能-广告快进

var video;//video标签实体
//重写video元素ratechange事件，当音频/视频的播放速度已更改时
video.addEventListener('ratechange', function(e) {
	if(e.target.readyState > 0){
		video.playbackRate = 1;
	}
});

H5视频播放速度原生相关接口

名称	类型	描述
defaultPlaybackRate	HTML5 Audio/Video 属性	设置或返回音频/视频的默认播放速度
playbackRate	HTML5 Audio/Video 属性	设置或返回音频/视频播放的速度
ratechange	HTML5 Audio/Video 事件	当音频/视频的播放速度已更改时

扩展-Video Speed Controller功能

视频默认播放速度是1，从video.playbackRate接口获取

名称	对应按键	描述
Decrease speed	S	慢速播放，每次减0.1，如0.9
Increase speed	D	快速播放，每次加0.1，如1.1
Rewind	Z	倒带
Advance	X	-
Reset speed	R	重置播放速度为1
Preferred speed	G	恢复到重置之前的播放速度
Mute	-	静音
Pause	-	暂停

以上参上可以在插件控制面板中重新设置

扩展-Video Speed Controller源码

去github看看源码

chrome.runtime.sendMessage({}, function(response) {
	var tc = {
		settings: {
			speed: 1.0,           // default 1x

			/**
			 * these are not used and deprecated, will be removed in next update
			 * but should be stay there because chrome.storage.sync.get needs them
			 */
			resetSpeed: 1.0,      // default 1.0
			speedStep: null,       // default 0.1x just for buttons
			fastSpeed: null,       // default 1.8x
			rewindTime: null,       // default 10s just for buttons
			advanceTime: null,      // default 10s just for buttons
			resetKeyCode: null,    // default: R
			slowerKeyCode: null,    // default: S
			fasterKeyCode: null,    // default: D
			rewindKeyCode: null,    // default: Z
			advanceKeyCode: null,   // default: X
			fastKeyCode: null,      // default: G
			/**
			 * these(above) are not used and deprecated, will be removed in next update
			 * but should be stay there because chrome.storage.sync.get needs them.
			 */

			displayKeyCode: 86,   // default: V
			rememberSpeed: false, // default: false
			startHidden: false,   // default: false
			keyBindings: [],
			blacklist: `
        www.instagram.com
        twitter.com
        vine.co
        imgur.com
      `.replace(/^\s+|\s+$/gm,'')
		}
	};

	chrome.storage.sync.get(tc.settings, function (storage) {
		tc.settings.keyBindings = storage.keyBindings; // Array
		if (storage.keyBindings.length == 0) // if first initialization of 0.5.3
		{
			// UPDATE
			tc.settings.keyBindings.push({
				action: "slower",
				key: Number(storage.slowerKeyCode) || 83,
				value: Number(storage.speedStep) || 0.1,
				force: false,
				predefined: true
			}); // default S
			tc.settings.keyBindings.push({
				action: "faster",
				key: Number(storage.fasterKeyCode) || 68,
				value: Number(storage.speedStep) || 0.1,
				force: false,
				predefined: true
			}); // default: D
			tc.settings.keyBindings.push({
				action: "rewind",
				key: Number(storage.rewindKeyCode) || 90,
				value: Number(storage.rewindTime) || 10,
				force: false,
				predefined: true
			}); // default: Z
			tc.settings.keyBindings.push({
				action: "advance",
				key: Number(storage.advanceKeyCode) || 88,
				value: Number(storage.advanceTime) || 10,
				force: false,
				predefined: true
			}); // default: X
			tc.settings.keyBindings.push({
				action: "reset",
				key: Number(storage.resetKeyCode) || 82,
				value: 1.0,
				force: false,
				predefined: true
			}); // default: R
			tc.settings.keyBindings.push({
				action: "fast",
				key: Number(storage.fastKeyCode) || 71,
				value: Number(storage.fastSpeed) || 1.8,
				force: false,
				predefined: true
			}); // default: G
			tc.settings.version = "0.5.3";

			chrome.storage.sync.set({
				keyBindings: tc.settings.keyBindings,
				version: tc.settings.version,
				displayKeyCode: tc.settings.displayKeyCode,
				rememberSpeed: tc.settings.rememberSpeed,
				startHidden: tc.settings.startHidden,
				blacklist: tc.settings.blacklist.replace(/^\s+|\s+$/gm, '')
			});
		}
		tc.settings.speed = Number(storage.speed);
		tc.settings.displayKeyCode = Number(storage.displayKeyCode);
		tc.settings.rememberSpeed = Boolean(storage.rememberSpeed);
		tc.settings.startHidden = Boolean(storage.startHidden);
		tc.settings.blacklist = String(storage.blacklist);

		initializeWhenReady(document);
	});

	var forEach = Array.prototype.forEach;

	function getKeyBindings(action, what = "value") {
		try {
			return tc.settings.keyBindings.find(item => item.action === action)[what];
		} catch (e) {
			return false;
		}
	}

	function setKeyBindings(action, value) {
		tc.settings.keyBindings.find(item => item.action === action)["value"] = value;
	}

	function defineVideoController() {
		tc.videoController = function(target, parent) {
			if (target.dataset['vscid']) {
				return;
			}

			this.video = target;
			this.parent = target.parentElement || parent;
			this.document = target.ownerDocument;
			this.id = Math.random().toString(36).substr(2, 9);
			if (!tc.settings.rememberSpeed) {
				tc.settings.speed = 1.0;
				setKeyBindings("reset", getKeyBindings("fast")); // resetSpeed = fastSpeed
			}
			this.initializeControls();

			target.addEventListener('play', function(event) {
				target.playbackRate = tc.settings.speed;
			});

			target.addEventListener('ratechange', function(event) {
				// Ignore ratechange events on unitialized videos.
				// 0 == No information is available about the media resource.
				if (event.target.readyState > 0) {
					var speed = this.getSpeed();
					this.speedIndicator.textContent = speed;
					tc.settings.speed = speed;
					chrome.storage.sync.set({'speed': speed}, function() {
						console.log('Speed setting saved: ' + speed);
					});
				}
			}.bind(this));

			target.playbackRate = tc.settings.speed;
		};

		tc.videoController.prototype.getSpeed = function() {
			return parseFloat(this.video.playbackRate).toFixed(2);
		}

		tc.videoController.prototype.remove = function() {
			this.parentElement.removeChild(this);
		}

		tc.videoController.prototype.initializeControls = function() {
			var document = this.document;
			var speed = parseFloat(tc.settings.speed).toFixed(2),
				top = Math.max(this.video.offsetTop, 0) + "px",
				left = Math.max(this.video.offsetLeft, 0) + "px";

			var wrapper = document.createElement('div');
			wrapper.classList.add('vsc-controller');
			wrapper.dataset['vscid'] = this.id;

			if (tc.settings.startHidden) {
				wrapper.classList.add('vsc-hidden');
			}

			var shadow = wrapper.attachShadow({ mode: 'open' });
			var shadowTemplate = `
        

        
${top}; left:${left}">
          ${speed}
          
            «
            -
            +
            »
            x
          
        
`;
shadow.innerHTML = shadowTemplate;
shadow.querySelector('.draggable').addEventListener('mousedown', (e) => {
runAction(e.target.dataset['action'], document, false, e);
});
forEach.call(shadow.querySelectorAll('button'), function(button) {
button.onclick = (e) => {
runAction(e.target.dataset['action'], document, getKeyBindings(e.target.dataset['action']), e);
}
});
this.speedIndicator = shadow.querySelector('span');
var fragment = document.createDocumentFragment();
fragment.appendChild(wrapper);
this.video.classList.add('vsc-initialized');
this.video.dataset['vscid'] = this.id;
switch (true) {
case (location.hostname == 'www.amazon.com'):
case (location.hostname == 'www.reddit.com'):
case (/hbogo\./).test(location.hostname):
// insert before parent to bypass overlay
this.parent.parentElement.insertBefore(fragment, this.parent);
break;
default:
// Note: when triggered via a MutationRecord, it's possible that the
// target is not the immediate parent. This appends the controller as
// the first element of the target, which may not be the parent.
this.parent.insertBefore(fragment, this.parent.firstChild);
}
}
}
function initializeWhenReady(document) {
escapeStringRegExp.matchOperatorsRe = /[|\\{}()[\]^$+*?.]/g;
function escapeStringRegExp(str) {
return str.replace(escapeStringRegExp.matchOperatorsRe, '\\$&');
}
var blacklisted = false;
tc.settings.blacklist.split("\n").forEach(match => {
match = match.replace(/^\s+|\s+$/g,'')
if (match.length == 0) {
return;
}
var regexp = new RegExp(escapeStringRegExp(match));
if (regexp.test(location.href)) {
blacklisted = true;
return;
}
})
if (blacklisted)
return;
window.onload = () => {
initializeNow(window.document)
};
if (document) {
if (document.readyState === "complete") {
initializeNow(document);
} else {
document.onreadystatechange = () => {
if (document.readyState === "complete") {
initializeNow(document);
}
}
}
}
}
function inIframe () {
try {
return window.self !== window.top;
} catch (e) {
return true;
}
}
function initializeNow(document) {
// enforce init-once due to redundant callers
if (!document.body || document.body.classList.contains('vsc-initialized')) {
return;
}
document.body.classList.add('vsc-initialized');
if (document === window.document) {
defineVideoController();
} else {
var link = document.createElement('link');
link.href = chrome.runtime.getURL('inject.css');
link.type = 'text/css';
link.rel = 'stylesheet';
document.head.appendChild(link);
}
var docs = Array(document)
try {
if (inIframe())
docs.push(window.top.document);
} catch (e) {
}
docs.forEach(function(doc) {
doc.addEventListener('keydown', function(event) {
var keyCode = event.keyCode;
// Ignore if following modifier is active.
if (!event.getModifierState
|| event.getModifierState("Alt")
|| event.getModifierState("Control")
|| event.getModifierState("Fn")
|| event.getModifierState("Meta")
|| event.getModifierState("Hyper")
|| event.getModifierState("OS")) {
return;
}
// Ignore keydown event if typing in an input box
if (document.activeElement.nodeName === 'INPUT'
|| document.activeElement.nodeName === 'TEXTAREA'
|| document.activeElement.isContentEditable) {
return false;
}
if (keyCode == tc.settings.displayKeyCode) {
runAction('display', document, true)
}
var item = tc.settings.keyBindings.find(item => item.key === keyCode);
if (item) {
runAction(item.action, document, item.value);
if (item.force === "true") {// disable websites key bindings
event.preventDefault();
event.stopPropagation();
}
}
return false;
}, true);
});
function checkForVideo(node, parent, added) {
if (node.nodeName === 'VIDEO') {
if (added) {
new tc.videoController(node, parent);
} else {
if (node.classList.contains('vsc-initialized')) {
let id = node.dataset['vscid'];
let ctrl = document.querySelector(`div[data-vscid="${id}"]`)
if (ctrl) {
ctrl.remove();
}
node.classList.remove('vsc-initialized');
delete node.dataset['vscid'];
}
}
} else if (node.children != undefined) {
for (var i = 0; i < node.children.length; i++) {
const child = node.children[i];
checkForVideo(child, child.parentNode || parent, added);
}
}
}
var observer = new MutationObserver(function(mutations) {
// Process the DOM nodes lazily
requestIdleCallback(_ => {
mutations.forEach(function(mutation) {
forEach.call(mutation.addedNodes, function(node) {
if (typeof node === "function")
return;
checkForVideo(node, node.parentNode || mutation.target, true);
});
forEach.call(mutation.removedNodes, function(node) {
if (typeof node === "function")
return;
checkForVideo(node, node.parentNode || mutation.target, false);
});
});
}, {timeout: 1000});
});
observer.observe(document, { childList: true, subtree: true });
var videoTags = document.getElementsByTagName('video');
forEach.call(videoTags, function(video) {
new tc.videoController(video);
});
var frameTags = document.getElementsByTagName('iframe');
forEach.call(frameTags, function(frame) {
// Ignore frames we don't have permission to access (different origin).
try { var childDocument = frame.contentDocument } catch (e) { return }
initializeWhenReady(childDocument);
});
}
function runAction(action, document, value, e) {
var videoTags = document.getElementsByTagName('video');
videoTags.forEach = Array.prototype.forEach;
videoTags.forEach(function(v) {
var id = v.dataset['vscid'];
var controller = document.querySelector(`div[data-vscid="${id}"]`);
showController(controller);
if (!v.classList.contains('vsc-cancelled')) {
if (action === 'rewind') {
v.currentTime -= value;
} else if (action === 'advance') {
v.currentTime += value;
} else if (action === 'faster') {
// Maximum playback speed in Chrome is set to 16:
// https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/html/media/HTMLMediaElement.cpp?l=168
var s = Math.min((v.playbackRate < 0.1 ? 0.0 : v.playbackRate) + value, 16);
v.playbackRate = Number(s.toFixed(2));
} else if (action === 'slower') {
// Video min rate is 0.0625:
// https://cs.chromium.org/chromium/src/third_party/WebKit/Source/core/html/media/HTMLMediaElement.cpp?l=167
var s = Math.max(v.playbackRate - value, 0.07);
v.playbackRate = Number(s.toFixed(2));
} else if (action === 'reset') {
resetSpeed(v, 1.0);
} else if (action === 'display') {
controller.classList.add('vsc-manual');
controller.classList.toggle('vsc-hidden');
} else if (action === 'drag') {
handleDrag(v, controller, e);
} else if (action === 'fast') {
resetSpeed(v, value);
} else if (action === 'pause') {
pauseSpeed(v, value);
} else if (action === 'muted') {
muted(v, value);
}
}
});
}
function pauseSpeed(v, target) {
// not working as expected in youtube for now
if (v.playbackRate === target) {
v.play()
}
resetSpeed(v, target)
}
function resetSpeed(v, target) {
if (v.playbackRate === target) {
if (v.playbackRate === getKeyBindings("reset")) { // resetSpeed
if (target !== 1.0) {
v.playbackRate = 1.0;
} else {
v.playbackRate = getKeyBindings("fast"); // fastSpeed
}
}
else
{
v.playbackRate = getKeyBindings("reset"); // resetSpeed
}
} else {
setKeyBindings("reset", v.playbackRate);// resetSpeed
// chrome.storage.sync.set({'resetSpeed': v.playbackRate});
v.playbackRate = target;
}
}
function muted(v, value) {
v.muted = v.muted !== true; //reverse muted status
/* this can be used if someone wants just mute button
switch (value) {
case 2:
v.muted = false;
break;
case 1:
v.muted = true;
break;
default:
v.muted = v.muted !== true;
break;
}
*/
}
function handleDrag(video, controller, e) {
const shadowController = controller.shadowRoot.querySelector('#controller');
// Find nearest parent of same size as video parent.
var parentElement = controller.parentElement;
while (parentElement.parentNode &&
parentElement.parentNode.offsetHeight === parentElement.offsetHeight &&
parentElement.parentNode.offsetWidth === parentElement.offsetWidth) {
parentElement = parentElement.parentNode;
}
video.classList.add('vcs-dragging');
shadowController.classList.add('dragging');
const initialMouseXY = [e.clientX, e.clientY];
const initialControllerXY = [
parseInt(shadowController.style.left),
parseInt(shadowController.style.top)
];
const startDragging = (e) => {
let style = shadowController.style;
let dx = e.clientX - initialMouseXY[0];
let dy = e.clientY -initialMouseXY[1];
style.left = (initialControllerXY[0] + dx) + 'px';
style.top = (initialControllerXY[1] + dy) + 'px';
}
const stopDragging = () => {
parentElement.removeEventListener('mousemove', startDragging);
parentElement.removeEventListener('mouseup', stopDragging);
parentElement.removeEventListener('mouseleave', stopDragging);
shadowController.classList.remove('dragging');
video.classList.remove('vcs-dragging');
}
parentElement.addEventListener('mouseup',stopDragging);
parentElement.addEventListener('mouseleave',stopDragging);
parentElement.addEventListener('mousemove', startDragging);
}
var timer;
var animation = false;
function showController(controller) {
controller.classList.add('vcs-show');
if (animation)
clearTimeout(timer);
animation = true;
timer = setTimeout(function() {
controller.classList.remove('vcs-show');
animation = false;
}, 2000);
}
});

参考资料

• HTML 5 视频/音频参考手册

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