248 lines
11 KiB
HTML
248 lines
11 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>webRTC</title>
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</head>
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<body>
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<div>
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<h1>webRTC</h1>
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<p>选择音乐使频道内所有设备同步播放 chrome://webrtc-internals/</p>
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</div>
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<script type="module">
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import IndexedDB from './database.js'
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import MusicList from './music.js'
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import ClientList from './client.js'
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// 缓冲分片发送
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const CHUNK_SIZE = 1024 * 64 // 默认每个块的大小为128KB
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const THRESHOLD = 1024 * 1024 // 默认缓冲区的阈值为1MB
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const DELAY = 50 // 默认延迟500ms
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// 将两个ArrayBuffer合并成一个
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function appendBuffer(buffer1, buffer2) {
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const tmp = new Uint8Array(buffer1.byteLength + buffer2.byteLength)
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tmp.set(new Uint8Array(buffer1), 0)
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tmp.set(new Uint8Array(buffer2), buffer1.byteLength)
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return tmp.buffer
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}
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// 读取本地音乐列表(本地缓存)
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const database = new IndexedDB('musicDatabase', 1, 'musicObjectStore')
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await database.open()
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const list = await database.getAll()
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// 读取本地用户名(本地缓存)
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const name = localStorage.getItem('username') ?? '游客'
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// 初始化客户端列表
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const clientList = new ClientList({
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name,
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onexit: async client => {
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console.log(client.name, '离开频道', client)
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// 从列表中移除未缓存的此用户的音乐, 但可能多人都有此音乐且未缓存
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// 因此每条音乐都要检查是否有其他用户也有此音乐, 如果有则不移除
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const 此用户音乐 = client.musicList.map(item => item.id)
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const 无数据音乐 = musicList.list.filter(item => !item.arrayBuffer).filter(item => {
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return 此用户音乐.includes(item.id)
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})
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无数据音乐.forEach(item => {
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const client = clientList.clientlist.find(client => {
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return client.musicList.find(x => x.id === item.id)
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})
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if (!client) musicList.remove(item)
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})
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}
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})
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// 初始化音乐列表(加入本地缓存)
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const musicList = new MusicList({
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list,
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onplay: item => {
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console.log('播放音乐', item.name)
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},
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onstop: item => {
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console.log('停止音乐', item?.name)
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},
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onlike: (item, list) => {
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console.log('喜欢音乐', item.name)
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if (item.arrayBuffer) {
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database.add(item)
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clientList.send('base', JSON.stringify({
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type: 'set_music_list',
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list: list.map(({ id, name, size, type }) => ({ id, name, size, type }))
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}))
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}
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},
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onunlike: (item, list) => {
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console.log('取消喜欢', item.name)
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if (item.arrayBuffer) {
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database.delete(item.id)
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clientList.send('base', JSON.stringify({
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type: 'set_music_list',
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list: list.map(({ id, name, size, type }) => ({ id, name, size, type }))
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}))
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}
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},
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onban: item => {
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console.log('禁止音乐', item.name)
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},
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onunban: item => {
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console.log('解禁音乐', item.name)
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},
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onremove: item => {
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console.log('移除音乐', item.name)
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database.delete(item.id)
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},
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onadd: (item, list) => {
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console.log('添加音乐', item.name)
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},
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onupdate: item => {
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console.log('更新音乐', item.name)
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database.put(item)
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},
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onerror: error => {
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console.log('音乐列表错误', error)
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},
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onload: async (item, sourceBuffer) => {
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console.log('加载音乐', item)
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return await new Promise((resolve) => {
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var buffer = new ArrayBuffer(0) // 接收音乐数据
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var count = 0 // 接收分片计数
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var bufferCursor = 0 // 加载进度
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var partlength = 1024 * 64 // 每次加载1MB
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// 指针达到音乐数据大小则结束加载
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const mediaLoader = async () => {
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while (bufferCursor !== item.size) {
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if (musicList.audio.paused && musicList.audio.src === '') {
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console.log('音乐数据加载中, 但是音频已经停止播放')
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break
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}
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const 当前播放进度 = musicList.audio.currentTime
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const 当前结束时间 = sourceBuffer.buffered.length && sourceBuffer.buffered.end(0)
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const 剩余数据长度 = buffer.byteLength - bufferCursor
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const 本次加载长度 = Math.min(partlength, 剩余数据长度)
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const 缓冲时间 = 当前结束时间 - 当前播放进度
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if (buffer.byteLength > bufferCursor && !sourceBuffer.updating && 缓冲时间 < 60) {
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sourceBuffer.appendBuffer(buffer.slice(bufferCursor, bufferCursor + 本次加载长度))
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bufferCursor += 本次加载长度
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}
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await new Promise((resolve) => setTimeout(resolve, 1000))
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}
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}
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mediaLoader()
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clientList.setChannel(`music-data-${item.id}`, {
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onmessage: async (event, client) => {
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console.log('收到音乐数据 chunk', count, buffer.byteLength)
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buffer = appendBuffer(buffer, event.data)
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count++
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if (buffer.byteLength >= item.size) {
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console.log('音乐数据接收完毕')
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item.arrayBuffer = buffer
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event.target.close() // 关闭信道
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resolve(item)
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}
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}
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})
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const client = clientList.clientlist.find(client => {
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return client.musicList.find(x => x.id === item.id)
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})
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console.log('向', client.name, '请求音乐数据')
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const c = Math.ceil(item.size / CHUNK_SIZE)
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console.log('需要接收', c, '个分片')
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clientList.sendto(client.id, 'base', JSON.stringify({
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type: 'get_music_data', id: item.id, channel: `music-data-${item.id}`
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}))
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})
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}
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})
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// 只有一个基本信道, 用于交换和调度信息
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clientList.setChannel('base', {
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onopen: async event => {
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console.group('')
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console.log('打开信道', event.target.label)
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// 要求对方发送音乐列表
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clientList.send('base', JSON.stringify({ type: 'get_music_list' }))
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},
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onmessage: async (event, client) => {
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const { type, id, channel, list } = JSON.parse(event.data)
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if (type === 'get_music_list') {
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const ms = musicList.list.filter(item => item.arrayBuffer)
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console.log(client.name, '请求音乐列表:', ms)
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clientList.sendto(client.id, 'base', JSON.stringify({
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type: 'set_music_list',
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list: ms.map(({ id, name, size, type }) => ({ id, name, size, type }))
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}))
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return
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}
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if (type === 'set_music_list') {
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console.log(client.name, '发来音乐列表:', `x${JSON.parse(event.data).list.length}`)
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console.log('将列表保存到本机记录:', client)
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client.musicList = list
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client.musicList.forEach(music => musicList.add(music))
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return
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}
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if (type === 'get_music_data') {
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// 建立一个信道, 用于传输音乐数据(接收方已经准备好摘要信息)
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console.log(client.name, '建立一个信道, 用于传输音乐数据', musicList.list)
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musicList.list.filter(item => item.id === id).forEach(item => {
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const ch = client.webrtc.createDataChannel(channel, { reliable: true })
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ch.onopen = async event => {
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console.log(client.name, `打开 ${channel} 信道传输音乐数据`, item.name)
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// 将音乐数据分成多个小块，并逐个发送
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async function sendChunk(dataChannel, data, index = 0, buffer = new ArrayBuffer(0)) {
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while (index < data.byteLength) {
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if (dataChannel.bufferedAmount <= THRESHOLD) {
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const chunk = data.slice(index, index + CHUNK_SIZE)
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dataChannel.send(chunk)
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index += CHUNK_SIZE
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buffer = appendBuffer(buffer, chunk)
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}
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await new Promise((resolve) => setTimeout(resolve, DELAY))
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}
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return buffer
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}
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await sendChunk(ch, item.arrayBuffer)
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console.log(client.name, `获取 ${channel} 信道数据结束`, item.name)
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ch.close() // 关闭信道
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}
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})
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return
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}
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console.log('未知类型:', type)
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},
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onclose: event => {
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console.groupEnd('')
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console.log('关闭信道', event.target.label)
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},
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onerror: error => {
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console.groupEnd('')
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console.log('信道错误', error)
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}
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})
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// 延迟1500ms
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//await new Promise((resolve) => setTimeout(resolve, 100))
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// 设置自己的主机名
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const nameInput = document.createElement('input')
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nameInput.type = 'text'
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nameInput.placeholder = '请设置你的名字'
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nameInput.value = name
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nameInput.onchange = event => {
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localStorage.setItem('username', event.target.value)
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window.location.reload() // 简单刷新页面
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}
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document.body.appendChild(nameInput)
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</script>
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</body>
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</html> |