<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>webRTC</title>
</head>
<body>
<div>
<h1>webRTC</h1>
<p>选择音乐使频道内所有设备同步播放 chrome://webrtc-internals/</p>
</div>
<script type="module">
import IndexedDB from './database.js'
import MusicList from './music.js'
import ClientList from './client.js'
// 缓冲分片发送
const CHUNK_SIZE = 1024 * 64 // 默认每个块的大小为128KB
const THRESHOLD = 1024 * 1024 // 默认缓冲区的阈值为1MB
const DELAY = 50 // 默认延迟500ms
// 将两个ArrayBuffer合并成一个
function appendBuffer(buffer1, buffer2) {
const tmp = new Uint8Array(buffer1.byteLength + buffer2.byteLength)
tmp.set(new Uint8Array(buffer1), 0)
tmp.set(new Uint8Array(buffer2), buffer1.byteLength)
return tmp.buffer
}
// 读取本地音乐列表并标识为缓存状态(本地缓存)
const database = new IndexedDB('musicDatabase', 1, 'musicObjectStore')
await database.open()
const list = (await database.getAll()).map(item => {
return { save: true, ...item }
})
// 读取本地用户名(本地缓存)
const name = localStorage.getItem('username') ?? '游客'
const avatar = localStorage.getItem('avatar') ?? '/favicon.ico'
// 初始化客户端列表
const clientList = new ClientList({
name,
onexit: async client => {
console.log(client.name, '离开频道', client)
// 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
// 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
const 此用户音乐 = client.musicList?.map(item => item.id) || []
const 无数据音乐 = musicList.list.filter(item => !item.arrayBuffer).filter(item => {
return 此用户音乐.includes(item.id)
})
无数据音乐.forEach(item => {
const client = clientList.clientlist.find(client => {
return client.musicList.find(x => x.id === item.id)
})
if (!client) musicList.remove(item)
})
}
})
// 初始化音乐列表(加入本地缓存)
const musicList = new MusicList({
list,
onplay: item => {
console.log('播放音乐', item.name)
},
onstop: item => {
console.log('停止音乐', item?.name)
},
onlike: (item, list) => {
console.log('喜欢音乐', item.name)
if (item.arrayBuffer) {
database.add(item)
clientList.send('base', JSON.stringify({
type: 'set_music_list',
list: list.map(({ id, name, size, type }) => ({ id, name, size, type }))
}))
}
},
onunlike: (item, list) => {
console.log('取消喜欢', item.name)
if (item.arrayBuffer) {
database.delete(item.id)
clientList.send('base', JSON.stringify({
type: 'set_music_list',
list: list.map(({ id, name, size, type }) => ({ id, name, size, type }))
}))
}
},
onban: item => {
console.info('禁止音乐', item.name)
},
onunban: item => {
console.info('解禁音乐', item.name)
},
onremove: item => {
console.info('移除音乐', item.name)
database.delete(item.id)
},
onadd: (item, list) => {
console.info('添加音乐', item.name)
},
onupdate: item => {
console.info('更新音乐', item.name)
database.put(item)
},
onerror: error => {
console.error('音乐列表错误', error)
},
onload: async item => {
console.info('加载音乐', item)
return await new Promise((resolve) => {
var buffer = new ArrayBuffer(0) // 接收音乐数据
var count = 0 // 接收分片计数
const chunkNumber = Math.ceil(item.size / 1024 / 64) // 64KB每片
clientList.setChannel(`music-data-${item.id}`, {
onmessage: async (event, client) => {
console.log('收到音乐数据 chunk', `${count + 1}/${chunkNumber}`, buffer.byteLength)
buffer = appendBuffer(buffer, event.data) // 合并分片准备存储
item.arrayBufferChunks?.push(event.data) // 保存分片给边下边播
count++
if (buffer.byteLength >= item.size) {
console.log('音乐数据接收完毕')
item.arrayBuffer = buffer
event.target.close() // 关闭信道
resolve(item)
}
}
})
const client = clientList.clientlist.find(client => {
return client.musicList.find(x => x.id === item.id)
})
console.info('向', client.name, '请求音乐数据')
const c = Math.ceil(item.size / CHUNK_SIZE)
console.log('需要接收', c, '个分片')
clientList.sendto(client.id, 'base', JSON.stringify({
type: 'get_music_data', id: item.id, channel: `music-data-${item.id}`
}))
})
}
})
// 只有一个基本信道, 用于交换和调度信息
clientList.setChannel('base', {
onopen: async event => {
console.debug('打开信道', event.target.label, '广播请求音乐列表和身份信息')
clientList.send('base', JSON.stringify({ type: 'get_music_list' })) // 要求对方发送音乐列表
clientList.send('base', JSON.stringify({ type: 'get_user_profile' })) // 要求对方发送身份信息
},
onmessage: async (event, client) => {
const data = JSON.parse(event.data)
if (data.type === 'get_user_profile') {
console.log(client.name, '请求身份信息:', data)
// 包过大会导致发送失败, 因此需要分开发送
clientList.sendto(client.id, 'base', JSON.stringify({
type: 'set_user_profile',
name: name,
avatar: avatar,
}))
return
}
if (data.type === 'set_user_profile') {
console.log(client.name, '发来身份信息:', data)
console.log('将身份信息保存到本机记录:', client)
client.name = data.name
client.avatar = data.avatar
// 还需要更新组件的用户信息
console.log('更新组件的用户信息:', data, client)
clientList.setAvatar({ id:client.id, ...data })
return
}
if (data.type === 'get_music_list') {
const ms = musicList.list.filter(item => item.arrayBuffer)
console.log(client.name, '请求音乐列表:', ms)
clientList.sendto(client.id, 'base', JSON.stringify({
type: 'set_music_list',
list: ms.map(({ id, name, size, type }) => ({ id, name, size, type }))
}))
return
}
if (data.type === 'set_music_list') {
console.log(client.name, '发来音乐列表:', `x${JSON.parse(event.data).list.length}`)
client.musicList = data.list
client.musicList.forEach(music => musicList.add(music))
return
}
if (data.type === 'get_music_data') {
// 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)
console.log(client.name, '建立一个信道, 用于传输音乐数据', musicList.list)
musicList.list.filter(item => item.id === data.id).forEach(item => {
const ch = client.webrtc.createDataChannel(data.channel, { reliable: true })
ch.onopen = async event => {
console.log(client.name, `打开 ${data.channel} 信道传输音乐数据`, item.name)
// 将音乐数据分成多个小块，并逐个发送
async function sendChunk(dataChannel, data, index = 0, buffer = new ArrayBuffer(0)) {
while (index < data.byteLength) {
if (dataChannel.bufferedAmount <= THRESHOLD) {
const chunk = data.slice(index, index + CHUNK_SIZE)
dataChannel.send(chunk)
index += CHUNK_SIZE
buffer = appendBuffer(buffer, chunk)
}
await new Promise((resolve) => setTimeout(resolve, DELAY))
}
return buffer
}
await sendChunk(ch, item.arrayBuffer)
console.log(client.name, `获取 ${data.channel} 信道数据结束`, item.name)
ch.close() // 关闭信道
}
})
return
}
console.log('未知类型:', data.type)
},
onclose: event => {
console.log('关闭信道', event.target.label)
},
onerror: event => {
console.error('信道错误', event.target.label, event.error)
}
})
// 延迟1500ms
//await new Promise((resolve) => setTimeout(resolve, 100))
// 设置自己的主机名
const nameInput = document.createElement('input')
nameInput.type = 'text'
nameInput.placeholder = '请设置你的昵称'
nameInput.value = name
nameInput.onchange = event => {
localStorage.setItem('username', event.target.value)
window.location.reload() // 简单刷新页面
}
document.body.appendChild(nameInput)
if (localStorage.getItem('avatar')) {
const favicon = document.createElement('link')
favicon.rel = 'icon'
favicon.href = localStorage.getItem('avatar')
document.head.appendChild(favicon)
}
</script>
</body>
</html>