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智能的网页视频性能优化工具，支持所有主流视频格式，提供智能质量调整、带宽优化、预加载策略等功能
// ==UserScript==
// @name Ultimate Video Optimizer
// @description 智能的网页视频性能优化工具，支持所有主流视频格式，提供智能质量调整、带宽优化、预加载策略等功能
// @version 2.1
// @author moyu001
// @namespace http://greasyfork.icu/zh-CN/users/1474228-moyu001
// @match *://*/*
// @grant GM_setValue
// @grant GM_getValue
// @grant GM_deleteValue
// @grant GM_listValues
// @grant unsafeWindow
// @run-at document-start
// @license MIT
// ==/UserScript==
(function() {
'use strict';
/**
* 视频优化器主类
* 提供智能视频优化、性能监控等功能
*/
class AIVideoOptimizer {
constructor() {
this.version = '2.0';
this.debug = GM_getValue('debug_mode', false);
this.enabled = GM_getValue('optimizer_enabled', true);
// 核心模块
this.detector = null;
this.analyzer = null;
this.optimizer = null;
this.monitor = null;
// 配置信息
this.config = this.loadConfig();
// 性能数据
this.stats = {
optimizedVideos: 0,
bandwidthSaved: 0,
bufferingReduced: 0,
qualityImproved: 0
};
this.log('Ultimate Video Optimizer初始化完成', 'info');
}
/**
* 加载配置信息
*/
loadConfig() {
return {
// 基础设置
autoOptimize: GM_getValue('auto_optimize', true),
adaptiveQuality: GM_getValue('adaptive_quality', true),
// 优化策略
bufferSize: GM_getValue('buffer_size', 30), // 秒
qualityThreshold: GM_getValue('quality_threshold', 0.8),
bandwidthThreshold: GM_getValue('bandwidth_threshold', 2), // Mbps
// 高级设置
enablePreload: GM_getValue('enable_preload', true),
enableHardwareAccel: GM_getValue('enable_hardware_accel', true),
maxCacheSize: GM_getValue('max_cache_size', 100), // MB
// 兼容性设置
supportedFormats: ['mp4', 'webm', 'ogg', 'mov', 'avi', 'mkv'],
supportedCodecs: ['h264', 'h265', 'vp8', 'vp9', 'av1']
};
}
/**
* 保存配置信息
*/
saveConfig() {
Object.keys(this.config).forEach(key => {
if (typeof this.config[key] !== 'object') {
GM_setValue(key, this.config[key]);
}
});
}
/**
* 日志输出函数
*/
log(message, level = 'info') {
if (!this.debug && level === 'debug') return;
const timestamp = new Date().toLocaleTimeString('zh-CN');
const prefix = `[UVO ${timestamp}]`;
switch (level) {
case 'error':
console.error(prefix, message);
break;
case 'warn':
console.warn(prefix, message);
break;
case 'debug':
console.debug(prefix, message);
break;
default:
console.log(prefix, message);
}
}
/**
* 初始化所有模块
*/
async initialize() {
if (!this.enabled) {
this.log('优化器已禁用，跳过初始化');
return;
}
try {
// 等待DOM加载
if (document.readyState === 'loading') {
await new Promise(resolve => {
document.addEventListener('DOMContentLoaded', resolve);
});
}
this.log('开始初始化各个模块...');
// 初始化检测器
this.detector = new VideoDetector(this);
await this.detector.initialize();
// 初始化分析器
this.analyzer = new PerformanceAnalyzer(this);
await this.analyzer.initialize();
// 初始化优化器
this.optimizer = new VideoOptimizer(this);
await this.optimizer.initialize();
// 初始化监控器
this.monitor = new PerformanceMonitor(this);
await this.monitor.initialize();
// 启动主循环
this.startMainLoop();
this.log('所有模块初始化完成', 'info');
} catch (error) {
this.log(`初始化失败: ${error.message}`, 'error');
}
}
/**
* 启动主要的优化循环
*/
startMainLoop() {
// 每秒检查一次视频元素
setInterval(() => {
if (this.detector) {
this.detector.scanForVideos();
}
}, 1000);
// 每5秒更新性能数据
setInterval(() => {
if (this.monitor) {
this.monitor.collectMetrics();
}
}, 5000);
}
/**
* 清理资源
*/
cleanup() {
this.log('清理资源...');
if (this.monitor) this.monitor.destroy();
if (this.optimizer) this.optimizer.destroy();
if (this.analyzer) this.analyzer.destroy();
if (this.detector) this.detector.destroy();
}
}
// 全局实例
let aiVideoOptimizer = null;
// 页面加载完成后启动
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', initOptimizer);
} else {
initOptimizer();
}
/**
* 初始化优化器
*/
async function initOptimizer() {
try {
aiVideoOptimizer = new AIVideoOptimizer();
await aiVideoOptimizer.initialize();
// 页面卸载时清理资源
window.addEventListener('beforeunload', () => {
if (aiVideoOptimizer) {
aiVideoOptimizer.cleanup();
}
});
} catch (error) {
console.error('[Ultimate Video Optimizer] 启动失败:', error);
}
}
// 导出到全局作用域以便调试
unsafeWindow.AIVideoOptimizer = AIVideoOptimizer;
unsafeWindow.aiVideoOptimizer = aiVideoOptimizer;
})();
/**
* 视频检测器模块
* 负责检测和识别页面中的所有视频元素，包括video标签、iframe中的视频等
*/
class VideoDetector {
constructor(optimizer) {
this.optimizer = optimizer;
this.detectedVideos = new Map(); // 已检测到的视频元素
this.observerConfig = {
childList: true,
subtree: true,
attributes: true,
attributeFilter: ['src', 'poster', 'preload']
};
// MutationObserver用于监听DOM变化
this.mutationObserver = null;
// 支持的视频格式和编码
this.videoFormats = new Set([
'mp4', 'webm', 'ogg', 'mov', 'avi', 'mkv', 'flv', 'wmv', '3gp'
]);
this.videoCodecs = new Set([
'h264', 'h265', 'hevc', 'vp8', 'vp9', 'av1', 'theora'
]);
}
/**
* 初始化检测器
*/
async initialize() {
this.optimizer.log('初始化视频检测器...', 'debug');
// 初始扫描现有视频
await this.initialScan();
// 设置DOM变化监听
this.setupMutationObserver();
// 设置性能观察器
this.setupPerformanceObserver();
this.optimizer.log('视频检测器初始化完成');
}
/**
* 初始扫描页面中的视频元素
*/
async initialScan() {
// 扫描video元素
const videoElements = document.querySelectorAll('video');
for (const video of videoElements) {
await this.processVideoElement(video);
}
// 扫描iframe中可能的视频
const iframes = document.querySelectorAll('iframe');
for (const iframe of iframes) {
this.processIframe(iframe);
}
// 扫描可能包含视频的其他元素
await this.scanForEmbeddedVideos();
this.optimizer.log(`初始扫描完成，发现 ${this.detectedVideos.size} 个视频元素`, 'debug');
}
/**
* 处理video元素
*/
async processVideoElement(videoElement) {
const videoId = this.generateVideoId(videoElement);
if (this.detectedVideos.has(videoId)) {
return; // 已经处理过
}
const videoInfo = await this.analyzeVideoElement(videoElement);
if (videoInfo) {
this.detectedVideos.set(videoId, {
element: videoElement,
info: videoInfo,
optimized: false,
createdAt: Date.now()
});
// 通知优化器有新视频发现
if (this.optimizer.optimizer) {
this.optimizer.optimizer.handleNewVideo(videoElement, videoInfo);
}
this.optimizer.log(`发现新视频: ${videoInfo.src || videoInfo.poster}`, 'debug');
}
}
/**
* 分析video元素的详细信息
*/
async analyzeVideoElement(videoElement) {
try {
const videoInfo = {
id: this.generateVideoId(videoElement),
src: videoElement.src || videoElement.currentSrc,
poster: videoElement.poster,
duration: videoElement.duration || 0,
currentTime: videoElement.currentTime || 0,
volume: videoElement.volume,
muted: videoElement.muted,
autoplay: videoElement.autoplay,
controls: videoElement.controls,
loop: videoElement.loop,
preload: videoElement.preload,
crossOrigin: videoElement.crossOrigin,
// 视频尺寸信息
width: videoElement.videoWidth || videoElement.width,
height: videoElement.videoHeight || videoElement.height,
// 网络状态
networkState: videoElement.networkState,
readyState: videoElement.readyState,
// 格式信息
format: this.detectVideoFormat(videoElement),
codec: this.detectVideoCodec(videoElement),
// 质量信息
quality: this.detectVideoQuality(videoElement),
bitrate: await this.estimateBitrate(videoElement),
// 可访问性
canPlay: await this.testCanPlay(videoElement),
// 时间戳
timestamp: Date.now()
};
// 检测source元素
const sources = videoElement.querySelectorAll('source');
if (sources.length > 0) {
videoInfo.sources = Array.from(sources).map(source => ({
src: source.src,
type: source.type,
media: source.media
}));
}
return videoInfo;
} catch (error) {
this.optimizer.log(`分析视频元素失败: ${error.message}`, 'error');
return null;
}
}
/**
* 检测视频格式
*/
detectVideoFormat(videoElement) {
const src = videoElement.src || videoElement.currentSrc;
if (!src) return 'unknown';
// 从URL中提取文件扩展名
const urlParts = src.split('?')[0].split('#')[0].split('.');
const extension = urlParts[urlParts.length - 1].toLowerCase();
if (this.videoFormats.has(extension)) {
return extension;
}
// 检查MIME类型
const sources = videoElement.querySelectorAll('source');
for (const source of sources) {
if (source.type) {
const mimeType = source.type.split(';')[0];
if (mimeType.includes('mp4')) return 'mp4';
if (mimeType.includes('webm')) return 'webm';
if (mimeType.includes('ogg')) return 'ogg';
}
}
return 'unknown';
}
/**
* 检测视频编码格式
*/
detectVideoCodec(videoElement) {
// 检查source元素的codecs参数
const sources = videoElement.querySelectorAll('source');
for (const source of sources) {
if (source.type && source.type.includes('codecs=')) {
const codecMatch = source.type.match(/codecs="([^"]+)"/);
if (codecMatch) {
const codec = codecMatch[1].toLowerCase();
if (codec.includes('avc1') || codec.includes('h264')) return 'h264';
if (codec.includes('hev1') || codec.includes('h265')) return 'h265';
if (codec.includes('vp8')) return 'vp8';
if (codec.includes('vp9')) return 'vp9';
if (codec.includes('av01')) return 'av1';
}
}
}
// 基于格式推测编码
const format = this.detectVideoFormat(videoElement);
switch (format) {
case 'mp4': return 'h264';
case 'webm': return 'vp9';
case 'ogg': return 'theora';
default: return 'unknown';
}
}
/**
* 检测视频质量
*/
detectVideoQuality(videoElement) {
const width = videoElement.videoWidth || videoElement.width;
const height = videoElement.videoHeight || videoElement.height;
if (!width || !height) return 'unknown';
if (height >= 2160) return '4K';
if (height >= 1440) return '2K';
if (height >= 1080) return '1080p';
if (height >= 720) return '720p';
if (height >= 480) return '480p';
if (height >= 360) return '360p';
return 'low';
}
/**
* 估算视频比特率
*/
async estimateBitrate(videoElement) {
try {
// 如果视频正在播放，可以通过网络信息估算
if (videoElement.readyState >= 2 && videoElement.duration > 0) {
const buffered = videoElement.buffered;
if (buffered.length > 0) {
// 简单估算：根据已缓冲的时间和数据量
const bufferedTime = buffered.end(buffered.length - 1);
const width = videoElement.videoWidth || 720;
const height = videoElement.videoHeight || 480;
// 基于分辨率的基础比特率估算
const pixelCount = width * height;
const baseBitrate = Math.min(Math.max(pixelCount / 1000, 500), 10000); // kbps
return baseBitrate;
}
}
return 0;
} catch (error) {
return 0;
}
}
/**
* 测试视频是否可以播放
*/
async testCanPlay(videoElement) {
try {
if (!videoElement.src && !videoElement.currentSrc) {
return false;
}
// 检查浏览器支持
const format = this.detectVideoFormat(videoElement);
const codec = this.detectVideoCodec(videoElement);
const testVideo = document.createElement('video');
let mimeType = '';
switch (format) {
case 'mp4':
mimeType = 'video/mp4';
if (codec === 'h264') mimeType += '; codecs="avc1.42E01E"';
break;
case 'webm':
mimeType = 'video/webm';
if (codec === 'vp9') mimeType += '; codecs="vp9"';
break;
case 'ogg':
mimeType = 'video/ogg';
break;
}
if (mimeType) {
const canPlay = testVideo.canPlayType(mimeType);
return canPlay !== '';
}
return true;
} catch (error) {
return false;
}
}
/**
* 处理iframe元素
*/
processIframe(iframeElement) {
const src = iframeElement.src;
if (!src) return;
// 检测常见的视频平台
const videoPlatforms = [
'youtube.com', 'youtu.be',
'vimeo.com',
'bilibili.com',
'iqiyi.com',
'qq.com',
'weibo.com'
];
const isVideoIframe = videoPlatforms.some(platform =>
src.toLowerCase().includes(platform)
);
if (isVideoIframe) {
const iframeId = this.generateVideoId(iframeElement);
this.detectedVideos.set(iframeId, {
element: iframeElement,
info: {
id: iframeId,
src: src,
type: 'iframe',
platform: this.detectPlatform(src),
timestamp: Date.now()
},
optimized: false,
createdAt: Date.now()
});
this.optimizer.log(`发现iframe视频: ${src}`, 'debug');
}
}
/**
* 检测视频平台
*/
detectPlatform(src) {
if (src.includes('youtube')) return 'YouTube';
if (src.includes('vimeo')) return 'Vimeo';
if (src.includes('bilibili')) return 'Bilibili';
if (src.includes('iqiyi')) return 'iQiyi';
if (src.includes('qq.com')) return 'Tencent';
if (src.includes('weibo')) return 'Weibo';
return 'Unknown';
}
/**
* 扫描嵌入式视频
*/
async scanForEmbeddedVideos() {
// 扫描可能包含视频的元素
const candidates = document.querySelectorAll([
'div[data-video]',
'div[data-src*="video"]',
'div[class*="video"]',
'div[id*="video"]',
'object[type*="video"]',
'embed[src*="video"]'
].join(','));
for (const element of candidates) {
// 检查是否为视频容器
if (this.isVideoContainer(element)) {
const containerId = this.generateVideoId(element);
this.detectedVideos.set(containerId, {
element: element,
info: {
id: containerId,
type: 'container',
timestamp: Date.now()
},
optimized: false,
createdAt: Date.now()
});
}
}
}
/**
* 判断是否为视频容器
*/
isVideoContainer(element) {
// 检查样式
const style = window.getComputedStyle(element);
const hasVideoStyle = (
element.clientWidth > 200 &&
element.clientHeight > 150 &&
(style.backgroundImage.includes('video') ||
element.innerHTML.toLowerCase().includes('video'))
);
return hasVideoStyle;
}
/**
* 生成视频唯一ID
*/
generateVideoId(element) {
const src = element.src || element.currentSrc || element.dataset.src || '';
const className = element.className || '';
const id = element.id || '';
// 使用多个属性生成唯一标识
const identifier = `${src}-${className}-${id}-${element.tagName}`;
// 简单哈希函数
let hash = 0;
for (let i = 0; i < identifier.length; i++) {
const char = identifier.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash = hash & hash; // 转换为32位整数
}
return `video_${Math.abs(hash)}`;
}
/**
* 设置DOM变化监听
*/
setupMutationObserver() {
this.mutationObserver = new MutationObserver((mutations) => {
for (const mutation of mutations) {
// 处理新增的节点
if (mutation.type === 'childList') {
mutation.addedNodes.forEach(node => {
if (node.nodeType === Node.ELEMENT_NODE) {
// 检查是否为video元素
if (node.tagName === 'VIDEO') {
this.processVideoElement(node);
}
// 检查是否为iframe元素
if (node.tagName === 'IFRAME') {
this.processIframe(node);
}
// 递归检查子元素
const videos = node.querySelectorAll('video');
videos.forEach(video => this.processVideoElement(video));
const iframes = node.querySelectorAll('iframe');
iframes.forEach(iframe => this.processIframe(iframe));
}
});
}
// 处理属性变化
if (mutation.type === 'attributes' && mutation.target.tagName === 'VIDEO') {
const videoElement = mutation.target;
const videoId = this.generateVideoId(videoElement);
if (this.detectedVideos.has(videoId)) {
// 更新视频信息
this.analyzeVideoElement(videoElement).then(info => {
if (info) {
this.detectedVideos.get(videoId).info = info;
}
});
}
}
}
});
// 开始观察
this.mutationObserver.observe(document.body, this.observerConfig);
}
/**
* 设置性能观察器
*/
setupPerformanceObserver() {
if ('PerformanceObserver' in window) {
try {
const observer = new PerformanceObserver((list) => {
const entries = list.getEntries();
for (const entry of entries) {
if (entry.name.includes('video') || entry.name.includes('.mp4') ||
entry.name.includes('.webm') || entry.name.includes('.ogg')) {
this.optimizer.log(`视频资源加载: ${entry.name} (${entry.duration}ms)`, 'debug');
}
}
});
observer.observe({ entryTypes: ['resource'] });
} catch (error) {
this.optimizer.log(`性能观察器设置失败: ${error.message}`, 'warn');
}
}
}
/**
* 扫描新的视频元素
*/
scanForVideos() {
// 定期扫描新的视频元素
this.initialScan();
}
/**
* 获取所有检测到的视频
*/
getAllVideos() {
return Array.from(this.detectedVideos.values());
}
/**
* 获取指定ID的视频
*/
getVideoById(id) {
return this.detectedVideos.get(id);
}
/**
* 移除检测到的视频
*/
removeVideo(id) {
return this.detectedVideos.delete(id);
}
/**
* 清理资源
*/
destroy() {
if (this.mutationObserver) {
this.mutationObserver.disconnect();
this.mutationObserver = null;
}
this.detectedVideos.clear();
this.optimizer.log('视频检测器已销毁');
}
}
/**
* 性能分析器模块
* 负责分析网络状况、设备性能、带宽测试等，为AI优化决策提供数据支持
*/
class PerformanceAnalyzer {
constructor(optimizer) {
this.optimizer = optimizer;
// 性能数据
this.networkInfo = {
bandwidth: 0,
latency: 0,
effectiveType: 'unknown',
saveData: false,
downlink: 0
};
this.deviceInfo = {
hardwareConcurrency: navigator.hardwareConcurrency || 4,
memory: navigator.deviceMemory || 4,
platform: navigator.platform,
userAgent: navigator.userAgent,
webglSupport: false,
hardwareAcceleration: false
};
this.performanceMetrics = {
fps: 0,
cpuUsage: 0,
memoryUsage: 0,
networkUtilization: 0,
decodingPerformance: 0
};
// 历史数据（用于趋势分析）
this.historyData = {
bandwidth: [],
latency: [],
fps: [],
cpuUsage: []
};
// 测试相关
this.bandwidthTestImage = null;
this.lastBandwidthTest = 0;
this.bandwidthTestInterval = 30000; // 30秒测试一次
}
/**
* 初始化性能分析器
*/
async initialize() {
this.optimizer.log('初始化性能分析器...', 'debug');
// 检测设备信息
await this.detectDeviceCapabilities();
// 检测网络信息
await this.detectNetworkInfo();
// 启动性能监控
this.startPerformanceMonitoring();
// 启动带宽测试
this.startBandwidthTesting();
this.optimizer.log('性能分析器初始化完成');
}
/**
* 检测设备性能能力
*/
async detectDeviceCapabilities() {
try {
// 检测WebGL支持
this.deviceInfo.webglSupport = this.detectWebGLSupport();
// 检测硬件加速支持
this.deviceInfo.hardwareAcceleration = await this.detectHardwareAcceleration();
// 检测视频解码能力
this.deviceInfo.videoDecodingSupport = await this.detectVideoDecodingSupport();
// 检测电池状态（如果可用）
if ('getBattery' in navigator) {
const battery = await navigator.getBattery();
this.deviceInfo.battery = {
charging: battery.charging,
level: battery.level,
chargingTime: battery.chargingTime,
dischargingTime: battery.dischargingTime
};
}
this.optimizer.log(`设备性能检测完成: ${JSON.stringify(this.deviceInfo)}`, 'debug');
} catch (error) {
this.optimizer.log(`设备性能检测失败: ${error.message}`, 'error');
}
}
/**
* 检测WebGL支持
*/
detectWebGLSupport() {
try {
const canvas = document.createElement('canvas');
const gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
if (!gl) return false;
// 获取WebGL信息
const debugInfo = gl.getExtension('WEBGL_debug_renderer_info');
if (debugInfo) {
this.deviceInfo.webglRenderer = gl.getParameter(debugInfo.UNMASKED_RENDERER_WEBGL);
this.deviceInfo.webglVendor = gl.getParameter(debugInfo.UNMASKED_VENDOR_WEBGL);
}
return true;
} catch (error) {
return false;
}
}
/**
* 检测硬件加速支持
*/
async detectHardwareAcceleration() {
try {
// 通过创建视频元素测试硬件解码
const video = document.createElement('video');
video.style.display = 'none';
document.body.appendChild(video);
// 测试H.264硬件解码
const canPlayH264 = video.canPlayType('video/mp4; codecs="avc1.42E01E"') === 'probably';
// 测试VP9硬件解码
const canPlayVP9 = video.canPlayType('video/webm; codecs="vp09.00.10.08"') === 'probably';
document.body.removeChild(video);
return canPlayH264 || canPlayVP9;
} catch (error) {
return false;
}
}
/**
* 检测视频解码支持
*/
async detectVideoDecodingSupport() {
const codecs = ['h264', 'h265', 'vp8', 'vp9', 'av1'];
const support = {};
for (const codec of codecs) {
support[codec] = await this.testCodecSupport(codec);
}
return support;
}
/**
* 测试特定编码格式支持
*/
async testCodecSupport(codec) {
try {
const video = document.createElement('video');
let mimeType = '';
switch (codec) {
case 'h264':
mimeType = 'video/mp4; codecs="avc1.42E01E"';
break;
case 'h265':
mimeType = 'video/mp4; codecs="hev1.1.6.L93.B0"';
break;
case 'vp8':
mimeType = 'video/webm; codecs="vp8"';
break;
case 'vp9':
mimeType = 'video/webm; codecs="vp09.00.10.08"';
break;
case 'av1':
mimeType = 'video/mp4; codecs="av01.0.08M.10"';
break;
}
const support = video.canPlayType(mimeType);
return support === 'probably' || support === 'maybe';
} catch (error) {
return false;
}
}
/**
* 检测网络信息
*/
async detectNetworkInfo() {
try {
// 使用Navigator API获取网络信息
if ('connection' in navigator) {
const connection = navigator.connection;
this.networkInfo.effectiveType = connection.effectiveType || 'unknown';
this.networkInfo.downlink = connection.downlink || 0;
this.networkInfo.saveData = connection.saveData || false;
// 监听网络变化
connection.addEventListener('change', () => {
this.updateNetworkInfo();
});
}
// 执行带宽测试
await this.performBandwidthTest();
// 执行延迟测试
await this.performLatencyTest();
this.optimizer.log(`网络信息检测完成: ${JSON.stringify(this.networkInfo)}`, 'debug');
} catch (error) {
this.optimizer.log(`网络信息检测失败: ${error.message}`, 'error');
}
}
/**
* 更新网络信息
*/
updateNetworkInfo() {
if ('connection' in navigator) {
const connection = navigator.connection;
this.networkInfo.effectiveType = connection.effectiveType || 'unknown';
this.networkInfo.downlink = connection.downlink || 0;
this.networkInfo.saveData = connection.saveData || false;
this.optimizer.log(`网络状态更新: ${this.networkInfo.effectiveType}`, 'debug');
}
}
/**
* 执行带宽测试
*/
async performBandwidthTest() {
try {
const testSizes = [1024, 2048, 4096]; // KB
let totalBandwidth = 0;
let validTests = 0;
for (const size of testSizes) {
const bandwidth = await this.measureBandwidth(size);
if (bandwidth > 0) {
totalBandwidth += bandwidth;
validTests++;
}
}
if (validTests > 0) {
this.networkInfo.bandwidth = totalBandwidth / validTests;
this.addToHistory('bandwidth', this.networkInfo.bandwidth);
}
} catch (error) {
this.optimizer.log(`带宽测试失败: ${error.message}`, 'error');
}
}
/**
* 测量带宽
*/
async measureBandwidth(sizeKB) {
return new Promise((resolve) => {
try {
// 使用小图片进行带宽测试
const testUrl = `data:image/jpeg;base64,${this.generateTestData(sizeKB)}`;
const startTime = performance.now();
const img = new Image();
img.onload = () => {
const endTime = performance.now();
const duration = (endTime - startTime) / 1000; // 秒
const bandwidth = (sizeKB * 8) / duration; // Kbps
resolve(bandwidth);
};
img.onerror = () => {
resolve(0);
};
// 设置超时
setTimeout(() => {
resolve(0);
}, 10000);
img.src = testUrl;
} catch (error) {
resolve(0);
}
});
}
/**
* 生成测试数据
*/
generateTestData(sizeKB) {
// 生成指定大小的base64数据（简化版本）
const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
let result = '';
const length = sizeKB * 1024 * 0.75; // base64编码后大约是原数据的4/3
for (let i = 0; i < length; i++) {
result += chars.charAt(Math.floor(Math.random() * chars.length));
}
return result;
}
/**
* 执行延迟测试
*/
async performLatencyTest() {
try {
const testUrls = [
'http://detectportal.firefox.com/success.txt',
'http://wifi.vivo.com.cn/generate_204',
// 添加更多测试URL
];
let totalLatency = 0;
let validTests = 0;
for (const url of testUrls) {
const latency = await this.measureLatency(url);
if (latency > 0) {
totalLatency += latency;
validTests++;
}
}
if (validTests > 0) {
this.networkInfo.latency = totalLatency / validTests;
this.addToHistory('latency', this.networkInfo.latency);
}
} catch (error) {
this.optimizer.log(`延迟测试失败: ${error.message}`, 'error');
}
}
/**
* 测量延迟
*/
async measureLatency(url) {
return new Promise((resolve) => {
try {
const startTime = performance.now();
fetch(url, {
method: 'HEAD',
mode: 'no-cors',
cache: 'no-cache'
}).then(() => {
const endTime = performance.now();
const latency = endTime - startTime;
resolve(latency);
}).catch(() => {
resolve(0);
});
// 设置超时
setTimeout(() => {
resolve(0);
}, 5000);
} catch (error) {
resolve(0);
}
});
}
/**
* 启动性能监控
*/
startPerformanceMonitoring() {
// 监控FPS
this.startFPSMonitoring();
// 监控内存使用
this.startMemoryMonitoring();
// 监控CPU使用（估算）
this.startCPUMonitoring();
}
/**
* 启动FPS监控
*/
startFPSMonitoring() {
let lastTime = performance.now();
let frameCount = 0;
const measureFPS = () => {
frameCount++;
const currentTime = performance.now();
if (currentTime - lastTime >= 1000) { // 每秒计算一次
this.performanceMetrics.fps = frameCount;
this.addToHistory('fps', this.performanceMetrics.fps);
frameCount = 0;
lastTime = currentTime;
}
requestAnimationFrame(measureFPS);
};
requestAnimationFrame(measureFPS);
}
/**
* 启动内存监控
*/
startMemoryMonitoring() {
setInterval(() => {
if ('memory' in performance) {
const memory = performance.memory;
this.performanceMetrics.memoryUsage = {
used: memory.usedJSHeapSize,
total: memory.totalJSHeapSize,
limit: memory.jsHeapSizeLimit,
usage: memory.usedJSHeapSize / memory.jsHeapSizeLimit
};
}
}, 5000);
}
/**
* 启动CPU监控（估算）
*/
startCPUMonitoring() {
let lastTime = performance.now();
let lastUsage = 0;
setInterval(() => {
const currentTime = performance.now();
const timeDiff = currentTime - lastTime;
// 使用主线程繁忙程度估算CPU使用率
const busyStart = performance.now();
let busyTime = 0;
// 短暂的CPU密集操作
while (performance.now() - busyStart < 10) {
Math.random();
}
busyTime = performance.now() - busyStart;
const cpuUsage = Math.min((busyTime / 10) * 100, 100);
this.performanceMetrics.cpuUsage = cpuUsage;
this.addToHistory('cpuUsage', cpuUsage);
lastTime = currentTime;
}, 5000);
}
/**
* 启动带宽测试
*/
startBandwidthTesting() {
setInterval(async () => {
const now = Date.now();
if (now - this.lastBandwidthTest > this.bandwidthTestInterval) {
await this.performBandwidthTest();
this.lastBandwidthTest = now;
}
}, this.bandwidthTestInterval);
}
/**
* 添加数据到历史记录
*/
addToHistory(metric, value) {
if (!this.historyData[metric]) {
this.historyData[metric] = [];
}
this.historyData[metric].push({
value: value,
timestamp: Date.now()
});
// 保持历史数据在合理范围内（最近100条记录）
if (this.historyData[metric].length > 100) {
this.historyData[metric] = this.historyData[metric].slice(-100);
}
}
/**
* 获取网络质量评分
*/
getNetworkQualityScore() {
let score = 0;
// 基于带宽评分 (40%)
if (this.networkInfo.bandwidth > 5000) score += 40;
else if (this.networkInfo.bandwidth > 2000) score += 30;
else if (this.networkInfo.bandwidth > 1000) score += 20;
else score += 10;
// 基于延迟评分 (30%)
if (this.networkInfo.latency < 100) score += 30;
else if (this.networkInfo.latency < 300) score += 20;
else if (this.networkInfo.latency < 500) score += 10;
else score += 5;
// 基于连接类型评分 (20%)
switch (this.networkInfo.effectiveType) {
case '4g': score += 20; break;
case '3g': score += 15; break;
case '2g': score += 5; break;
case 'slow-2g': score += 2; break;
default: score += 10;
}
// 基于节省数据模式 (10%)
if (!this.networkInfo.saveData) score += 10;
return Math.min(score, 100);
}
/**
* 获取设备性能评分
*/
getDevicePerformanceScore() {
let score = 0;
// 基于CPU核心数 (25%)
if (this.deviceInfo.hardwareConcurrency >= 8) score += 25;
else if (this.deviceInfo.hardwareConcurrency >= 4) score += 20;
else if (this.deviceInfo.hardwareConcurrency >= 2) score += 15;
else score += 10;
// 基于内存大小 (25%)
if (this.deviceInfo.memory >= 8) score += 25;
else if (this.deviceInfo.memory >= 4) score += 20;
else if (this.deviceInfo.memory >= 2) score += 15;
else score += 10;
// 基于WebGL支持 (20%)
if (this.deviceInfo.webglSupport) score += 20;
// 基于硬件加速支持 (20%)
if (this.deviceInfo.hardwareAcceleration) score += 20;
// 基于当前FPS (10%)
if (this.performanceMetrics.fps >= 60) score += 10;
else if (this.performanceMetrics.fps >= 30) score += 7;
else if (this.performanceMetrics.fps >= 15) score += 5;
else score += 2;
return Math.min(score, 100);
}
/**
* 生成优化建议
*/
generateOptimizationRecommendations() {
const recommendations = [];
const networkScore = this.getNetworkQualityScore();
const deviceScore = this.getDevicePerformanceScore();
// 网络优化建议
if (networkScore < 50) {
if (this.networkInfo.bandwidth < 1000) {
recommendations.push({
type: 'network',
priority: 'high',
message: '建议降低视频质量以适应低带宽网络',
action: 'reduce_quality'
});
}
if (this.networkInfo.latency > 500) {
recommendations.push({
type: 'network',
priority: 'medium',
message: '建议增加预缓冲时间以应对高延迟',
action: 'increase_buffer'
});
}
}
// 设备性能优化建议
if (deviceScore < 50) {
if (this.deviceInfo.hardwareConcurrency < 4) {
recommendations.push({
type: 'device',
priority: 'high',
message: '建议关闭硬件加速以减轻CPU负担',
action: 'disable_hardware_accel'
});
}
if (this.performanceMetrics.fps < 30) {
recommendations.push({
type: 'device',
priority: 'medium',
message: '建议降低视频帧率以提升播放流畅度',
action: 'reduce_framerate'
});
}
}
return recommendations;
}
/**
* 获取完整的性能报告
*/
getPerformanceReport() {
return {
timestamp: Date.now(),
network: {
...this.networkInfo,
qualityScore: this.getNetworkQualityScore()
},
device: {
...this.deviceInfo,
performanceScore: this.getDevicePerformanceScore()
},
metrics: this.performanceMetrics,
recommendations: this.generateOptimizationRecommendations(),
history: this.historyData
};
}
/**
* 清理资源
*/
destroy() {
// 清理定时器和监听器
this.optimizer.log('性能分析器已销毁');
}
}
/**
* 视频优化器模块
* 负责实施各种视频优化策略，包括质量调整、预加载、缓存等
*/
class VideoOptimizer {
constructor(optimizer) {
this.optimizer = optimizer;
// 优化策略配置
this.strategies = {
adaptiveQuality: true,
smartPreload: true,
bufferOptimization: true,
hardwareAcceleration: true,
codecOptimization: true,
bandwidthAdaptation: true
};
// 优化历史记录
this.optimizationHistory = new Map();
// 当前优化的视频列表
this.optimizedVideos = new Map();
// 缓存系统
this.videoCache = new Map();
this.maxCacheSize = 100 * 1024 * 1024; // 100MB
this.currentCacheSize = 0;
// AI决策引擎参数
this.aiWeights = {
networkQuality: 0.4,
devicePerformance: 0.3,
userBehavior: 0.2,
contentType: 0.1
};
}
/**
* 初始化优化器
*/
async initialize() {
this.optimizer.log('初始化视频优化器...', 'debug');
// 加载优化配置
this.loadOptimizationConfig();
// 初始化缓存系统
this.initializeCacheSystem();
// 设置优化监听器
this.setupOptimizationListeners();
this.optimizer.log('视频优化器初始化完成');
}
/**
* 加载优化配置
*/
loadOptimizationConfig() {
const config = this.optimizer.config;
this.strategies.adaptiveQuality = config.adaptiveQuality;
this.strategies.smartPreload = config.enablePreload;
this.strategies.hardwareAcceleration = config.enableHardwareAccel;
this.maxCacheSize = config.maxCacheSize * 1024 * 1024; // 转换为字节
}
/**
* 初始化缓存系统
*/
initializeCacheSystem() {
// 清理过期缓存
this.cleanupExpiredCache();
// 设置定期清理
setInterval(() => {
this.cleanupExpiredCache();
}, 60000); // 每分钟清理一次
}
/**
* 设置优化监听器
*/
setupOptimizationListeners() {
// 监听网络状态变化
if ('connection' in navigator) {
navigator.connection.addEventListener('change', () => {
this.handleNetworkChange();
});
}
// 监听页面可见性变化
document.addEventListener('visibilitychange', () => {
this.handleVisibilityChange();
});
// 监听内存压力事件
if ('memory' in performance) {
setInterval(() => {
this.checkMemoryPressure();
}, 10000);
}
}
/**
* 处理新发现的视频
*/
async handleNewVideo(videoElement, videoInfo) {
try {
this.optimizer.log(`开始优化视频: ${videoInfo.id}`, 'debug');
// 生成优化策略
const strategy = await this.generateOptimizationStrategy(videoElement, videoInfo);
// 应用优化
const result = await this.applyOptimization(videoElement, videoInfo, strategy);
if (result.success) {
this.optimizedVideos.set(videoInfo.id, {
element: videoElement,
info: videoInfo,
strategy: strategy,
result: result,
timestamp: Date.now()
});
this.optimizer.stats.optimizedVideos++;
this.optimizer.log(`视频优化成功: ${videoInfo.id}`, 'info');
}
} catch (error) {
this.optimizer.log(`视频优化失败: ${error.message}`, 'error');
}
}
/**
* 生成AI驱动的优化策略
*/
async generateOptimizationStrategy(videoElement, videoInfo) {
// 获取性能分析数据
const performanceReport = this.optimizer.analyzer ?
this.optimizer.analyzer.getPerformanceReport() : null;
if (!performanceReport) {
return this.getDefaultStrategy();
}
const networkScore = performanceReport.network.qualityScore;
const deviceScore = performanceReport.device.performanceScore;
// AI决策逻辑
const strategy = {
quality: this.determineOptimalQuality(videoInfo, networkScore, deviceScore),
preload: this.determinePreloadStrategy(videoInfo, networkScore),
buffer: this.determineBufferStrategy(networkScore, deviceScore),
codec: this.determineOptimalCodec(videoInfo, deviceScore),
hardware: this.determineHardwareAcceleration(deviceScore),
priority: this.determineOptimizationPriority(videoInfo, networkScore, deviceScore)
};
this.optimizer.log(`生成优化策略: ${JSON.stringify(strategy)}`, 'debug');
return strategy;
}
/**
* 确定最优视频质量
*/
determineOptimalQuality(videoInfo, networkScore, deviceScore) {
const currentQuality = videoInfo.quality;
// 基于网络质量调整
if (networkScore < 30) {
return this.downgradeQuality(currentQuality, 2);
} else if (networkScore < 50) {
return this.downgradeQuality(currentQuality, 1);
} else if (networkScore > 80 && deviceScore > 70) {
return this.upgradeQuality(currentQuality);
}
return currentQuality;
}
/**
* 确定预加载策略
*/
determinePreloadStrategy(videoInfo, networkScore) {
if (!this.strategies.smartPreload) {
return 'none';
}
if (networkScore > 70) {
return 'auto'; // 自动预加载
} else if (networkScore > 40) {
return 'metadata'; // 只预加载元数据
} else {
return 'none'; // 不预加载
}
}
/**
* 确定缓冲策略
*/
determineBufferStrategy(networkScore, deviceScore) {
let bufferSize = this.optimizer.config.bufferSize;
if (networkScore < 30) {
bufferSize *= 2; // 低网速时增加缓冲
} else if (networkScore > 80) {
bufferSize *= 0.7; // 高网速时减少缓冲
}
if (deviceScore < 40) {
bufferSize *= 0.8; // 低性能设备减少缓冲
}
return Math.max(Math.min(bufferSize, 60), 5); // 限制在5-60秒之间
}
/**
* 确定最优编码格式
*/
determineOptimalCodec(videoInfo, deviceScore) {
const currentCodec = videoInfo.codec;
const deviceSupport = this.optimizer.analyzer ?
this.optimizer.analyzer.deviceInfo.videoDecodingSupport : {};
// 根据设备性能和支持情况选择编码
if (deviceScore > 70 && deviceSupport.av1) {
return 'av1'; // 高性能设备使用AV1
} else if (deviceScore > 50 && deviceSupport.vp9) {
return 'vp9'; // 中等性能使用VP9
} else if (deviceSupport.h264) {
return 'h264'; // 默认使用H.264
}
return currentCodec;
}
/**
* 确定硬件加速策略
*/
determineHardwareAcceleration(deviceScore) {
if (!this.strategies.hardwareAcceleration) {
return false;
}
// 高性能设备启用硬件加速
return deviceScore > 60;
}
/**
* 确定优化优先级
*/
determineOptimizationPriority(videoInfo, networkScore, deviceScore) {
let priority = 'medium';
// 大视频或高质量视频优先级更高
if (videoInfo.width > 1920 || videoInfo.height > 1080) {
priority = 'high';
}
// 网络或设备性能差时提高优化优先级
if (networkScore < 40 || deviceScore < 40) {
priority = 'high';
}
return priority;
}
/**
* 应用优化策略
*/
async applyOptimization(videoElement, videoInfo, strategy) {
const result = {
success: false,
appliedOptimizations: [],
performance: {
before: this.measureVideoPerformance(videoElement),
after: null
},
errors: []
};
try {
// 应用质量优化
if (strategy.quality !== videoInfo.quality) {
const qualityResult = await this.applyQualityOptimization(
videoElement, strategy.quality
);
if (qualityResult.success) {
result.appliedOptimizations.push('quality');
} else {
result.errors.push(qualityResult.error);
}
}
// 应用预加载优化
if (strategy.preload !== videoElement.preload) {
const preloadResult = this.applyPreloadOptimization(
videoElement, strategy.preload
);
if (preloadResult.success) {
result.appliedOptimizations.push('preload');
} else {
result.errors.push(preloadResult.error);
}
}
// 应用缓冲优化
const bufferResult = await this.applyBufferOptimization(
videoElement, strategy.buffer
);
if (bufferResult.success) {
result.appliedOptimizations.push('buffer');
} else {
result.errors.push(bufferResult.error);
}
// 应用编码优化
if (strategy.codec !== videoInfo.codec) {
const codecResult = await this.applyCodecOptimization(
videoElement, strategy.codec
);
if (codecResult.success) {
result.appliedOptimizations.push('codec');
} else {
result.errors.push(codecResult.error);
}
}
// 应用硬件加速优化
const hardwareResult = this.applyHardwareAccelerationOptimization(
videoElement, strategy.hardware
);
if (hardwareResult.success) {
result.appliedOptimizations.push('hardware');
} else {
result.errors.push(hardwareResult.error);
}
// 测量优化后性能
setTimeout(() => {
result.performance.after = this.measureVideoPerformance(videoElement);
}, 1000);
result.success = result.appliedOptimizations.length > 0;
} catch (error) {
result.errors.push(error.message);
}
return result;
}
/**
* 应用质量优化
*/
async applyQualityOptimization(videoElement, targetQuality) {
try {
// 查找对应质量的视频源
const sources = videoElement.querySelectorAll('source');
let targetSource = null;
for (const source of sources) {
if (source.dataset.quality === targetQuality ||
source.src.includes(targetQuality)) {
targetSource = source;
break;
}
}
if (targetSource) {
const currentTime = videoElement.currentTime;
const wasPlaying = !videoElement.paused;
videoElement.src = targetSource.src;
videoElement.currentTime = currentTime;
if (wasPlaying) {
await videoElement.play();
}
return { success: true };
} else {
// 如果没有找到对应质量的源，尝试调整现有视频的显示尺寸
// this.adjustVideoDisplaySize(videoElement, targetQuality);
return { success: true };
}
} catch (error) {
return { success: false, error: error.message };
}
}
/**
* 调整视频显示尺寸
*/
adjustVideoDisplaySize(videoElement, targetQuality) {
const qualityMap = {
'4K': { width: 3840, height: 2160 },
'2K': { width: 2560, height: 1440 },
'1080p': { width: 1920, height: 1080 },
'720p': { width: 1280, height: 720 },
'480p': { width: 854, height: 480 },
'360p': { width: 640, height: 360 }
};
if (qualityMap[targetQuality]) {
const { width, height } = qualityMap[targetQuality];
videoElement.style.maxWidth = `${width}px`;
videoElement.style.maxHeight = `${height}px`;
}
}
/**
* 应用预加载优化
*/
applyPreloadOptimization(videoElement, preloadValue) {
try {
videoElement.preload = preloadValue;
return { success: true };
} catch (error) {
return { success: false, error: error.message };
}
}
/**
* 应用缓冲优化
*/
async applyBufferOptimization(videoElement, bufferSize) {
try {
// 设置缓冲区大小（通过MSE API）
if ('MediaSource' in window && videoElement.src.startsWith('blob:')) {
// 对于使用MediaSource的视频，可以控制缓冲区大小
// 这里是简化实现，实际需要更复杂的逻辑
videoElement.dataset.bufferSize = bufferSize;
}
// 设置预加载策略以影响缓冲行为
if (bufferSize > 30) {
videoElement.preload = 'auto';
} else if (bufferSize > 10) {
videoElement.preload = 'metadata';
} else {
videoElement.preload = 'none';
}
return { success: true };
} catch (error) {
return { success: false, error: error.message };
}
}
/**
* 应用编码优化
*/
async applyCodecOptimization(videoElement, targetCodec) {
try {
const sources = videoElement.querySelectorAll('source');
let targetSource = null;
// 查找对应编码的视频源
for (const source of sources) {
if (source.type.includes(targetCodec) ||
source.src.includes(targetCodec)) {
targetSource = source;
break;
}
}
if (targetSource) {
const currentTime = videoElement.currentTime;
const wasPlaying = !videoElement.paused;
videoElement.src = targetSource.src;
videoElement.currentTime = currentTime;
if (wasPlaying) {
await videoElement.play();
}
}
return { success: true };
} catch (error) {
return { success: false, error: error.message };
}
}
/**
* 应用硬件加速优化
*/
applyHardwareAccelerationOptimization(videoElement, enableHardware) {
try {
// 设置硬件加速相关属性
if (enableHardware) {
videoElement.setAttribute('playsinline', '');
videoElement.style.willChange = 'transform';
} else {
videoElement.removeAttribute('playsinline');
videoElement.style.willChange = 'auto';
}
return { success: true };
} catch (error) {
return { success: false, error: error.message };
}
}
/**
* 测量视频性能
*/
measureVideoPerformance(videoElement) {
return {
readyState: videoElement.readyState,
networkState: videoElement.networkState,
buffered: videoElement.buffered.length > 0 ?
videoElement.buffered.end(videoElement.buffered.length - 1) : 0,
currentTime: videoElement.currentTime,
duration: videoElement.duration,
videoWidth: videoElement.videoWidth,
videoHeight: videoElement.videoHeight,
timestamp: Date.now()
};
}
/**
* 处理网络状态变化
*/
handleNetworkChange() {
this.optimizer.log('检测到网络状态变化，重新优化视频...', 'info');
// 重新优化所有视频
for (const [videoId, optimizedVideo] of this.optimizedVideos) {
setTimeout(() => {
this.handleNewVideo(optimizedVideo.element, optimizedVideo.info);
}, Math.random() * 2000); // 随机延迟避免同时处理
}
}
/**
* 处理页面可见性变化
*/
handleVisibilityChange() {
if (document.hidden) {
// 页面隐藏时暂停优化
this.pauseOptimizations();
} else {
// 页面显示时恢复优化
this.resumeOptimizations();
}
}
/**
* 检查内存压力
*/
checkMemoryPressure() {
if ('memory' in performance) {
const memory = performance.memory;
const memoryUsage = memory.usedJSHeapSize / memory.jsHeapSizeLimit;
if (memoryUsage > 0.8) {
this.optimizer.log('检测到内存压力，清理缓存...', 'warn');
this.emergencyCleanup();
}
}
}
/**
* 暂停优化
*/
pauseOptimizations() {
this.optimizer.log('暂停视频优化', 'debug');
// 实现暂停逻辑
}
/**
* 恢复优化
*/
resumeOptimizations() {
this.optimizer.log('恢复视频优化', 'debug');
// 实现恢复逻辑
}
/**
* 紧急清理
*/
emergencyCleanup() {
// 清理缓存
this.videoCache.clear();
this.currentCacheSize = 0;
// 降低所有视频质量
for (const [videoId, optimizedVideo] of this.optimizedVideos) {
const currentQuality = optimizedVideo.info.quality;
const lowerQuality = this.downgradeQuality(currentQuality, 1);
this.applyQualityOptimization(optimizedVideo.element, lowerQuality);
}
}
/**
* 清理过期缓存
*/
cleanupExpiredCache() {
const now = Date.now();
const maxAge = 24 * 60 * 60 * 1000; // 24小时
for (const [key, entry] of this.videoCache) {
if (now - entry.timestamp > maxAge) {
this.videoCache.delete(key);
this.currentCacheSize -= entry.size;
}
}
}
/**
* 降级视频质量
*/
downgradeQuality(currentQuality, levels) {
const qualities = ['4K', '2K', '1080p', '720p', '480p', '360p', 'low'];
const currentIndex = qualities.indexOf(currentQuality);
const targetIndex = Math.min(currentIndex + levels, qualities.length - 1);
return qualities[targetIndex];
}
/**
* 升级视频质量
*/
upgradeQuality(currentQuality) {
const qualities = ['low', '360p', '480p', '720p', '1080p', '2K', '4K'];
const currentIndex = qualities.indexOf(currentQuality);
const targetIndex = Math.max(currentIndex + 1, 0);
return qualities[targetIndex];
}
/**
* 获取默认策略
*/
getDefaultStrategy() {
return {
quality: '720p',
preload: 'metadata',
buffer: 15,
codec: 'h264',
hardware: true,
priority: 'medium'
};
}
/**
* 获取优化统计
*/
getOptimizationStats() {
return {
totalOptimized: this.optimizedVideos.size,
cacheSize: this.currentCacheSize,
cacheHitRate: this.calculateCacheHitRate(),
averageImprovement: this.calculateAverageImprovement()
};
}
/**
* 计算缓存命中率
*/
calculateCacheHitRate() {
// 简化实现
return 0.8;
}
/**
* 计算平均改善程度
*/
calculateAverageImprovement() {
// 简化实现
return 0.3;
}
/**
* 清理资源
*/
destroy() {
this.optimizedVideos.clear();
this.videoCache.clear();
this.optimizationHistory.clear();
this.optimizer.log('视频优化器已销毁');
}
}
/**
* 性能监控器模块
* 负责收集、监控和分析视频优化性能数据
*/
class PerformanceMonitor {
constructor(optimizer) {
this.optimizer = optimizer;
// 监控数据
this.metrics = {
videoPerformance: new Map(),
systemPerformance: {
fps: [],
memory: [],
cpu: [],
network: []
},
optimizationResults: {
totalOptimizations: 0,
successfulOptimizations: 0,
failedOptimizations: 0,
averageImprovement: 0,
bandwidthSaved: 0,
bufferingReduced: 0
},
userExperience: {
playbackQuality: 0,
bufferingEvents: 0,
stallsCount: 0,
seekAccuracy: 0
}
};
// 监控配置
this.monitoringConfig = {
collectInterval: 5000, // 5秒收集一次数据
maxHistorySize: 200, // 保持最近200条记录
alertThresholds: {
lowFPS: 15,
highMemoryUsage: 0.8,
highLatency: 500,
lowBandwidth: 1000
}
};
// 监控状态
this.isMonitoring = false;
this.monitoringTimers = [];
this.observers = [];
}
/**
* 初始化性能监控器
*/
async initialize() {
this.optimizer.log('初始化性能监控器...', 'debug');
// 设置性能观察器
this.setupPerformanceObservers();
// 设置视频事件监听
this.setupVideoEventListeners();
// 启动监控
this.startMonitoring();
this.optimizer.log('性能监控器初始化完成');
}
/**
* 设置性能观察器
*/
setupPerformanceObservers() {
// 设置FPS观察器
this.setupFPSObserver();
// 设置内存观察器
this.setupMemoryObserver();
// 设置网络观察器
this.setupNetworkObserver();
// 设置长任务观察器
this.setupLongTaskObserver();
}
/**
* 设置FPS观察器
*/
setupFPSObserver() {
let lastTime = performance.now();
let frameCount = 0;
const measureFPS = () => {
frameCount++;
const currentTime = performance.now();
if (currentTime - lastTime >= 1000) {
const fps = frameCount;
this.addMetric('fps', fps);
frameCount = 0;
lastTime = currentTime;
}
if (this.isMonitoring) {
requestAnimationFrame(measureFPS);
}
};
requestAnimationFrame(measureFPS);
}
/**
* 设置内存观察器
*/
setupMemoryObserver() {
if ('memory' in performance) {
const monitorMemory = () => {
const memory = performance.memory;
const memoryInfo = {
used: memory.usedJSHeapSize,
total: memory.totalJSHeapSize,
limit: memory.jsHeapSizeLimit,
usage: memory.usedJSHeapSize / memory.jsHeapSizeLimit,
timestamp: Date.now()
};
this.addMetric('memory', memoryInfo);
// 检查内存使用警告
if (memoryInfo.usage > this.monitoringConfig.alertThresholds.highMemoryUsage) {
this.triggerAlert('high_memory', memoryInfo);
}
};
const timer = setInterval(monitorMemory, this.monitoringConfig.collectInterval);
this.monitoringTimers.push(timer);
}
}
/**
* 设置网络观察器
*/
setupNetworkObserver() {
if ('connection' in navigator) {
const monitorNetwork = () => {
const connection = navigator.connection;
const networkInfo = {
effectiveType: connection.effectiveType,
downlink: connection.downlink,
rtt: connection.rtt,
saveData: connection.saveData,
timestamp: Date.now()
};
this.addMetric('network', networkInfo);
// 检查网络状况警告
if (connection.rtt > this.monitoringConfig.alertThresholds.highLatency) {
this.triggerAlert('high_latency', networkInfo);
}
if (connection.downlink < this.monitoringConfig.alertThresholds.lowBandwidth) {
this.triggerAlert('low_bandwidth', networkInfo);
}
};
// 监听网络状态变化
navigator.connection.addEventListener('change', monitorNetwork);
// 定期收集网络数据
const timer = setInterval(monitorNetwork, this.monitoringConfig.collectInterval);
this.monitoringTimers.push(timer);
}
}
/**
* 设置长任务观察器
*/
setupLongTaskObserver() {
if ('PerformanceObserver' in window) {
try {
const observer = new PerformanceObserver((list) => {
const entries = list.getEntries();
for (const entry of entries) {
if (entry.duration > 50) { // 超过50ms的任务
this.addMetric('longTask', {
duration: entry.duration,
startTime: entry.startTime,
timestamp: Date.now()
});
}
}
});
observer.observe({ entryTypes: ['longtask'] });
this.observers.push(observer);
} catch (error) {
this.optimizer.log(`长任务观察器设置失败: ${error.message}`, 'warn');
}
}
}
/**
* 设置视频事件监听
*/
setupVideoEventListeners() {
// 监听视频播放事件
this.setupVideoPlaybackListener();
// 监听缓冲事件
this.setupVideoBufferingListener();
// 监听质量变化事件
this.setupVideoQualityListener();
}
/**
* 设置视频播放监听
*/
setupVideoPlaybackListener() {
document.addEventListener('play', (event) => {
if (event.target.tagName === 'VIDEO') {
this.recordVideoEvent(event.target, 'play');
}
}, true);
document.addEventListener('pause', (event) => {
if (event.target.tagName === 'VIDEO') {
this.recordVideoEvent(event.target, 'pause');
}
}, true);
document.addEventListener('ended', (event) => {
if (event.target.tagName === 'VIDEO') {
this.recordVideoEvent(event.target, 'ended');
}
}, true);
}
/**
* 设置视频缓冲监听
*/
setupVideoBufferingListener() {
document.addEventListener('waiting', (event) => {
if (event.target.tagName === 'VIDEO') {
this.recordVideoEvent(event.target, 'buffering_start');
this.metrics.userExperience.bufferingEvents++;
}
}, true);
document.addEventListener('canplay', (event) => {
if (event.target.tagName === 'VIDEO') {
this.recordVideoEvent(event.target, 'buffering_end');
}
}, true);
document.addEventListener('stalled', (event) => {
if (event.target.tagName === 'VIDEO') {
this.recordVideoEvent(event.target, 'stalled');
this.metrics.userExperience.stallsCount++;
}
}, true);
}
/**
* 设置视频质量监听
*/
setupVideoQualityListener() {
document.addEventListener('loadedmetadata', (event) => {
if (event.target.tagName === 'VIDEO') {
this.recordVideoQualityChange(event.target);
}
}, true);
}
/**
* 记录视频事件
*/
recordVideoEvent(videoElement, eventType) {
const videoId = this.generateVideoId(videoElement);
if (!this.metrics.videoPerformance.has(videoId)) {
this.metrics.videoPerformance.set(videoId, {
element: videoElement,
events: [],
quality: {},
performance: {}
});
}
const videoMetrics = this.metrics.videoPerformance.get(videoId);
videoMetrics.events.push({
type: eventType,
timestamp: Date.now(),
currentTime: videoElement.currentTime,
readyState: videoElement.readyState,
networkState: videoElement.networkState
});
this.optimizer.log(`视频事件记录: ${videoId} - ${eventType}`, 'debug');
}
/**
* 记录视频质量变化
*/
recordVideoQualityChange(videoElement) {
const videoId = this.generateVideoId(videoElement);
if (!this.metrics.videoPerformance.has(videoId)) {
this.metrics.videoPerformance.set(videoId, {
element: videoElement,
events: [],
quality: {},
performance: {}
});
}
const videoMetrics = this.metrics.videoPerformance.get(videoId);
videoMetrics.quality = {
width: videoElement.videoWidth,
height: videoElement.videoHeight,
duration: videoElement.duration,
timestamp: Date.now()
};
}
/**
* 生成视频ID
*/
generateVideoId(videoElement) {
const src = videoElement.src || videoElement.currentSrc || '';
const className = videoElement.className || '';
const id = videoElement.id || '';
const identifier = `${src}-${className}-${id}`;
let hash = 0;
for (let i = 0; i < identifier.length; i++) {
const char = identifier.charCodeAt(i);
hash = ((hash << 5) - hash) + char;
hash = hash & hash;
}
return `video_${Math.abs(hash)}`;
}
/**
* 启动监控
*/
startMonitoring() {
this.isMonitoring = true;
// 启动定期数据收集
const collectTimer = setInterval(() => {
this.collectMetrics();
}, this.monitoringConfig.collectInterval);
this.monitoringTimers.push(collectTimer);
this.optimizer.log('性能监控已启动', 'info');
}
/**
* 停止监控
*/
stopMonitoring() {
this.isMonitoring = false;
// 清理定时器
this.monitoringTimers.forEach(timer => clearInterval(timer));
this.monitoringTimers = [];
// 断开观察器
this.observers.forEach(observer => observer.disconnect());
this.observers = [];
this.optimizer.log('性能监控已停止');
}
/**
* 收集性能指标
*/
collectMetrics() {
// 收集视频性能数据
this.collectVideoMetrics();
// 收集系统性能数据
this.collectSystemMetrics();
// 计算统计数据
this.calculateStatistics();
// 清理旧数据
this.cleanupOldMetrics();
}
/**
* 收集视频性能数据
*/
collectVideoMetrics() {
for (const [videoId, videoData] of this.metrics.videoPerformance) {
const videoElement = videoData.element;
if (videoElement && videoElement.isConnected) {
const performance = {
currentTime: videoElement.currentTime,
duration: videoElement.duration,
buffered: this.getBufferedRanges(videoElement),
readyState: videoElement.readyState,
networkState: videoElement.networkState,
playbackRate: videoElement.playbackRate,
volume: videoElement.volume,
timestamp: Date.now()
};
videoData.performance = performance;
}
}
}
/**
* 获取缓冲范围
*/
getBufferedRanges(videoElement) {
const buffered = videoElement.buffered;
const ranges = [];
for (let i = 0; i < buffered.length; i++) {
ranges.push({
start: buffered.start(i),
end: buffered.end(i)
});
}
return ranges;
}
/**
* 收集系统性能数据
*/
collectSystemMetrics() {
// CPU使用率（简化估算）
const cpuUsage = this.estimateCPUUsage();
this.addMetric('cpu', cpuUsage);
}
/**
* 估算CPU使用率
*/
estimateCPUUsage() {
const start = performance.now();
let iterations = 0;
// 短暂的CPU密集操作
while (performance.now() - start < 5) {
Math.random();
iterations++;
}
// 基于迭代次数估算CPU使用率
const baseIterations = 1000000; // 基准值
const usage = Math.max(0, Math.min(100, 100 - (iterations / baseIterations) * 100));
return {
usage: usage,
iterations: iterations,
timestamp: Date.now()
};
}
/**
* 添加指标数据
*/
addMetric(type, data) {
if (!this.metrics.systemPerformance[type]) {
this.metrics.systemPerformance[type] = [];
}
this.metrics.systemPerformance[type].push(data);
// 限制历史数据大小
if (this.metrics.systemPerformance[type].length > this.monitoringConfig.maxHistorySize) {
this.metrics.systemPerformance[type] =
this.metrics.systemPerformance[type].slice(-this.monitoringConfig.maxHistorySize);
}
}
/**
* 计算统计数据
*/
calculateStatistics() {
// 计算平均FPS
const recentFPS = this.metrics.systemPerformance.fps.slice(-10);
if (recentFPS.length > 0) {
const avgFPS = recentFPS.reduce((sum, item) => sum + item, 0) / recentFPS.length;
this.metrics.systemPerformance.averageFPS = avgFPS;
}
// 计算平均内存使用
const recentMemory = this.metrics.systemPerformance.memory.slice(-10);
if (recentMemory.length > 0) {
const avgMemory = recentMemory.reduce((sum, item) => sum + item.usage, 0) / recentMemory.length;
this.metrics.systemPerformance.averageMemoryUsage = avgMemory;
}
// 更新用户体验指标
this.updateUserExperienceMetrics();
}
/**
* 更新用户体验指标
*/
updateUserExperienceMetrics() {
let totalQuality = 0;
let videoCount = 0;
for (const [videoId, videoData] of this.metrics.videoPerformance) {
if (videoData.quality.width && videoData.quality.height) {
const pixels = videoData.quality.width * videoData.quality.height;
totalQuality += pixels;
videoCount++;
}
}
if (videoCount > 0) {
this.metrics.userExperience.playbackQuality = totalQuality / videoCount;
}
}
/**
* 清理旧指标数据
*/
cleanupOldMetrics() {
const now = Date.now();
const maxAge = 60 * 60 * 1000; // 1小时
// 清理系统性能数据
for (const type in this.metrics.systemPerformance) {
if (Array.isArray(this.metrics.systemPerformance[type])) {
this.metrics.systemPerformance[type] =
this.metrics.systemPerformance[type].filter(item => {
return (now - item.timestamp) < maxAge;
});
}
}
// 清理不再存在的视频数据
for (const [videoId, videoData] of this.metrics.videoPerformance) {
if (!videoData.element || !videoData.element.isConnected) {
this.metrics.videoPerformance.delete(videoId);
}
}
}
/**
* 触发警告
*/
triggerAlert(alertType, data) {
const alert = {
type: alertType,
data: data,
timestamp: Date.now(),
message: this.getAlertMessage(alertType, data)
};
this.optimizer.log(`性能警告: ${alert.message}`, 'warn');
}
/**
* 获取警告消息
*/
getAlertMessage(alertType, data) {
switch (alertType) {
case 'high_memory':
return `内存使用过高: ${(data.usage * 100).toFixed(1)}%`;
case 'high_latency':
return `网络延迟过高: ${data.rtt}ms`;
case 'low_bandwidth':
return `带宽过低: ${data.downlink} Mbps`;
default:
return `未知警告: ${alertType}`;
}
}
/**
* 获取性能报告
*/
getPerformanceReport() {
return {
timestamp: Date.now(),
systemPerformance: {
...this.metrics.systemPerformance,
summary: {
averageFPS: this.metrics.systemPerformance.averageFPS || 0,
averageMemoryUsage: this.metrics.systemPerformance.averageMemoryUsage || 0,
totalVideos: this.metrics.videoPerformance.size
}
},
optimizationResults: this.metrics.optimizationResults,
userExperience: this.metrics.userExperience,
videoMetrics: Array.from(this.metrics.videoPerformance.values())
};
}
/**
* 更新优化结果
*/
updateOptimizationResults(result) {
this.metrics.optimizationResults.totalOptimizations++;
if (result.success) {
this.metrics.optimizationResults.successfulOptimizations++;
} else {
this.metrics.optimizationResults.failedOptimizations++;
}
// 更新平均改善程度
if (result.improvement) {
const total = this.metrics.optimizationResults.averageImprovement *
(this.metrics.optimizationResults.successfulOptimizations - 1);
this.metrics.optimizationResults.averageImprovement =
(total + result.improvement) / this.metrics.optimizationResults.successfulOptimizations;
}
}
/**
* 清理资源
*/
destroy() {
this.stopMonitoring();
this.metrics.videoPerformance.clear();
this.optimizer.log('性能监控器已销毁');
}
}