233 lines
9.9 KiB
Markdown
233 lines
9.9 KiB
Markdown
# webRTC
|
|
webrtc 实现的 p2p 信道
|
|
|
|
- [x] P2P通信
|
|
- [x] 音乐播放
|
|
- [x] 请求到单个目标防止接收到重复分片数据
|
|
- [x] 主机记录各自曲目列表以供查询
|
|
- [x] 播放时高亮显示
|
|
- [x] 合并操作按钮
|
|
- [ ] 对方退出时清除其列表
|
|
- [ ] 集群分发
|
|
- [ ] 下载加速
|
|
- [ ] 即时通讯
|
|
|
|
- 能获取所有在线设备列表
|
|
- 随机连接至四个设备, 且按效率扩展收缩
|
|
- 将数据拆解同时向多台设备分发, 对端接收后再次分发
|
|
- 需要确保全部设备获得全部数据, 每台设备至少一半不重复
|
|
- 五色
|
|
- 单向链
|
|
- 固定填位(矩阵)
|
|
```txt
|
|
[a1, b1, c1, d1, e1]
|
|
[a2, b2, c2, d2, e2]
|
|
[a3, b3, c3, d3, e3]
|
|
```
|
|
|
|
|
|
备用代码片段
|
|
```html
|
|
<script type="module">
|
|
|
|
// webRTC 传递音乐(分别传输文件和操作事件能更流畅)
|
|
const music = async function () {
|
|
const clients = [] // 客户端列表
|
|
|
|
// 对端设备
|
|
const ul = document.createElement('ul')
|
|
document.body.appendChild(ul)
|
|
const protocol = window.location.protocol === 'https:' ? 'wss' : 'ws'
|
|
const host = window.location.host
|
|
const ws = new WebSocket(`${protocol}://${host}/webrtc/music`)
|
|
const pc = new RTCPeerConnection()
|
|
|
|
var audioSource = null
|
|
// 监听音乐列表播放事件
|
|
musicList.on('play', async item => {
|
|
audioSource?.stop() // 先停止可能在播放的音乐
|
|
console.log('播放音乐', item.arrayBuffer)
|
|
// 复制一份 item.arrayBuffer
|
|
const arrayBuffer = item.arrayBuffer.slice(0)
|
|
// 传输音乐文件向远程端
|
|
const audioContext = new AudioContext()
|
|
audioContext.decodeAudioData(arrayBuffer, async audioBuffer => {
|
|
// 将音乐流添加到 RTCPeerConnection
|
|
const mediaStreamDestination = audioContext.createMediaStreamDestination()
|
|
mediaStreamDestination.stream.getAudioTracks().forEach(function (track) {
|
|
pc.addTrack(track, mediaStreamDestination.stream)
|
|
})
|
|
// 播放音乐(远程)
|
|
audioSource = audioContext.createBufferSource()
|
|
audioSource.buffer = audioBuffer
|
|
audioSource.connect(mediaStreamDestination)
|
|
audioSource.start()
|
|
// 创建SDP offer并将其设置为本地描述, 发送给指定的远程端
|
|
const id = clients[0].id
|
|
await pc.setLocalDescription(await pc.createOffer()) // 设置本地描述为 offer
|
|
ws.send(JSON.stringify({ id, offer: pc.localDescription })) // 发送给远程终端 offer
|
|
})
|
|
})
|
|
// 监听音乐列表停止事件
|
|
musicList.on('stop', async () => {
|
|
audioSource?.stop()
|
|
audioSource = null
|
|
})
|
|
// 监听 ICE 候选事件
|
|
pc.onicecandidate = event => {
|
|
if (event.candidate) {
|
|
const id = clients[0].id
|
|
ws.send(JSON.stringify({ id, candidate: event.candidate })) // 发送 ICE 候选到远程终端
|
|
}
|
|
}
|
|
// 监听远程流事件
|
|
pc.ontrack = function (event) {
|
|
console.log('pc ontrack:', event)
|
|
const audio = document.createElement('audio')
|
|
audio.srcObject = event.streams[0]
|
|
audio.play()
|
|
}
|
|
ws.onmessage = async (event) => {
|
|
const data = JSON.parse(event.data)
|
|
if (data.type === 'push') {
|
|
console.log('收到 type:push 将设备增加', data.id)
|
|
clients.push({ id: data.id, channel: data.channel })
|
|
const li = document.createElement('li')
|
|
li.innerText = `id:${data.id} channel:${data.channel}`
|
|
li.id = data.id
|
|
li.onclick = async () => {
|
|
console.log('点击设备', data.id)
|
|
// 清理所有选中状态
|
|
clients.forEach(client => {
|
|
const li = document.getElementById(client.id)
|
|
if (data.id === client.id) {
|
|
li.style.backgroundColor = 'red'
|
|
console.log('设置选中状态', data.id)
|
|
return
|
|
}
|
|
li.style.backgroundColor = 'transparent'
|
|
console.log('清理选中状态', client.id)
|
|
})
|
|
}
|
|
ul.appendChild(li)
|
|
return
|
|
}
|
|
if (data.type === 'pull') {
|
|
console.log('收到 type:pull 将设备删除', data.id)
|
|
const index = clients.findIndex(client => client.id === data.id)
|
|
if (index !== -1) {
|
|
clients.splice(index, 1)
|
|
const li = document.getElementById(data.id)
|
|
li.remove()
|
|
}
|
|
return
|
|
}
|
|
if (data.type === 'error') {
|
|
console.log('收到 type:error 没什么可操作的', data.id)
|
|
return
|
|
}
|
|
if (data.offer) {
|
|
const id = clients[0].id
|
|
console.log('收到 offer 并将其设置为远程描述', data.offer)
|
|
await pc.setRemoteDescription(new RTCSessionDescription(data.offer)) // 设置远程描述为 offer
|
|
await pc.setLocalDescription(await pc.createAnswer()) // 设置本地描述为 answer
|
|
ws.send(JSON.stringify({ id, answer: pc.localDescription })) // 发送给远程终端 answer
|
|
return
|
|
}
|
|
if (data.answer) {
|
|
console.log('收到 answer 并将其设置为远程描述', data.answer)
|
|
await pc.setRemoteDescription(new RTCSessionDescription(data.answer))
|
|
return
|
|
}
|
|
if (data.candidate) {
|
|
console.log('收到 candidate 并将其添加到远程端', data.candidate)
|
|
await pc.addIceCandidate(new RTCIceCandidate(data.candidate))
|
|
return
|
|
}
|
|
}
|
|
}
|
|
//music()
|
|
</script>
|
|
<script type="module">
|
|
// 创建 RTCPeerConnection
|
|
const pc = new RTCPeerConnection()
|
|
// webSocket 连接服务器
|
|
const protocol = window.location.protocol === 'https:' ? 'wss' : 'ws'
|
|
const host = window.location.host
|
|
const ws = new WebSocket(`${protocol}://${host}/webrtc/default`)
|
|
ws.onopen = function () {
|
|
console.log('video ws open')
|
|
}
|
|
ws.onmessage = function (event) {
|
|
const data = JSON.parse(event.data)
|
|
console.log('ws message:', data)
|
|
if (data.offer) {
|
|
console.log('收到 offer 并将其设置为远程描述')
|
|
pc.setRemoteDescription(new RTCSessionDescription(data.offer))
|
|
// 创建SDP answer并将其设置为本地描述, 发送给远程端
|
|
pc.createAnswer().then(function (answer) {
|
|
pc.setLocalDescription(answer)
|
|
ws.send(JSON.stringify({ answer }))
|
|
})
|
|
return
|
|
}
|
|
if (data.answer) {
|
|
console.log('收到 answer 并将其设置为远程描述')
|
|
pc.setRemoteDescription(new RTCSessionDescription(data.answer))
|
|
return
|
|
}
|
|
if (data.candidate) {
|
|
console.log('收到 candidate 并将其添加到远程端')
|
|
pc.addIceCandidate(new RTCIceCandidate(data.candidate))
|
|
}
|
|
}
|
|
ws.onclose = function () {
|
|
console.log('ws close')
|
|
}
|
|
|
|
setTimeout(() => {
|
|
|
|
// 获取本地视频流
|
|
navigator.mediaDevices.getUserMedia({ audio: false, video: true }).then(stream => {
|
|
// 创建本地视频元素
|
|
const localVideo = document.createElement('video')
|
|
localVideo.srcObject = stream
|
|
localVideo.autoplay = true
|
|
localVideo.muted = true
|
|
document.body.appendChild(localVideo)
|
|
|
|
// 添加本地视频流到 RTCPeerConnection
|
|
stream.getTracks().forEach(function (track) {
|
|
pc.addTrack(track, stream)
|
|
})
|
|
|
|
// 监听 ICE candidate 事件
|
|
pc.onicecandidate = function (event) {
|
|
if (event.candidate) {
|
|
// 发送 ICE candidate 到远程端
|
|
ws.send(JSON.stringify({ candidate: event.candidate }))
|
|
}
|
|
}
|
|
|
|
// 监听远程视频流事件
|
|
pc.ontrack = function (event) {
|
|
// 创建远程视频元素
|
|
var remoteVideo = document.createElement('video')
|
|
remoteVideo.srcObject = event.streams[0]
|
|
remoteVideo.autoplay = true
|
|
document.body.appendChild(remoteVideo)
|
|
}
|
|
|
|
// 创建SDP offer并将其设置为本地描述, 发送给远程端
|
|
pc.createOffer().then(function (offer) {
|
|
pc.setLocalDescription(offer)
|
|
ws.send(JSON.stringify({ offer }))
|
|
})
|
|
|
|
}).catch(error => {
|
|
console.log(error)
|
|
})
|
|
|
|
}, 1000)
|
|
</script>
|
|
``` |