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webrtc
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webrtc/public/index.html

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init
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>webRTC</title>
</head>
<body>
<div>
<h1>webRTC</h1>
<p>message</p>
</div>
<script type="module">
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import IndexedDB from './database.js'
const musicObjectStore = new IndexedDB('musicDatabase', 1, 'musicObjectStore')
await musicObjectStore.open()
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// webRTC 传递音乐(分别传输文件和操作事件能更流畅)
const music = async function () {
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const clients = [] // 客户端列表
展示设备列表
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const ul = document.createElement('ul')
document.body.appendChild(ul)
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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()
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init
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// 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 })
展示设备列表
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const li = document.createElement('li')
li.innerText = `id:${data.id} channel:${data.channel}`
li.id = data.id
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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)
})
}
展示设备列表
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ul.appendChild(li)
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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)
展示设备列表
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const li = document.getElementById(data.id)
li.remove()
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}
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
}
}
indexedDB 缓存
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// 从数据库读取音乐文件
musicObjectStore.getAll().then(data => {
console.log('从数据库读取音乐文件', data)
const ol = document.createElement('ol')
data.forEach(item => {
const li = document.createElement('li')
li.innerText = `${item.name} - ${item.size} - ${item.type} - ${item.id}`
const start = document.createElement('button')
start.innerText = '播放'
start.onclick = async () => {
console.log('播放音乐', item)
// 传输音乐文件
const arrayBuffer = item.arrayBuffer
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
const audioSource = audioContext.createBufferSource()
audioSource.buffer = audioBuffer
audioSource.connect(mediaStreamDestination)
audioSource.start()
同步播放
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// 创建本地音频播放器
const audioPlayer = new Audio()
audioPlayer.srcObject = mediaStreamDestination.stream
audioPlayer.play()
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// 创建SDP offer并将其设置为本地描述, 发送给远程端
console.log('创建SDP offer并将其设置为本地描述, 发送给远程端')
console.log('clients:', clients)
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
})
}
li.appendChild(start)
const remove = document.createElement('button')
remove.innerText = '移除'
remove.onclick = async () => {
await musicObjectStore.delete(item.id)
li.remove()
}
li.appendChild(remove)
ol.appendChild(li)
})
document.body.appendChild(ol)
})
init
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// 从文件系统中选择音乐文件
const button = document.createElement('button')
button.innerText = '选择音乐'
button.addEventListener('click', async () => {
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const id = Date.now()
init
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const fileHandle = await window.showOpenFilePicker()
const file = await fileHandle[0].getFile()
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const { name, size, type, lastModified, lastModifiedDate } = file
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const reader = new FileReader()
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reader.onload = async () => {
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const arrayBuffer = reader.result
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// 存储到 IndexDB
musicObjectStore.add({ id, name, size, type, lastModified, lastModifiedDate, arrayBuffer })
init
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// 传输音乐文件
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const audioContext = new AudioContext()
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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
const 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, 发送给远程端
console.log('创建SDP offer并将其设置为本地描述, 发送给远程端')
console.log('clients:', clients)
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
})
}
reader.readAsArrayBuffer(file)
})
document.body.appendChild(button)
}
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-->
</body>
</html>