原本今天想要做一個可以分享個人桌面給其他人的 Electron 應用程式 ,
沒將程式做出來 , 才臨時改成介紹 HTML 的版本 (×_×)
我們使用 WebRTC 作為分享螢幕的工具 , 今天先製作存 HTML 可用的版本 , 明天將其轉換成 Electron 的版本
需要使用 Socket.io 傳遞 WebRTC 的 Signaling , 下方建立 socket.io 的 server
// Node.js
const port = process.env.PORT || 3000;
const server = require('http').createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.write('Hello World!');
res.end();
}).listen(port);
// Socket.io
const io = require('socket.io')(server);
function findNowRoom(client) {
return Object.keys(client.rooms).find(item => {
return item !== client.id
});
}
io.on('connection', client => {
console.log(`socket 用戶連接 ${client.id}`);
client.on('joinRoom', room => {
console.log(room);
const nowRoom = findNowRoom(client);
if (nowRoom) {
client.leave(nowRoom);
}
client.join(room, () => {
io.sockets.in(room).emit('roomBroadcast', '已有新人加入聊天室！');
});
});
client.on('peerconnectSignaling', message => {
console.log('接收資料：', message);
const nowRoom = findNowRoom(client);
client.to(nowRoom).emit('peerconnectSignaling', message)
});
client.on('disconnect', () => {
console.log(`socket 用戶離開 ${client.id}`);
});
});
然後下方做一個 HTML 使用 WebRTC
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>WebRTC</title>
<script src="https://cdn.jsdelivr.net/npm/socket.io-client@2/dist/socket.io.js"></script>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
</head>
<body>
<div id="app">
<div class="row m-3 ml-5">
<button class="btn btn-primary" @click="initPeerConnection">初始化</button>
<button class="btn btn-primary btnCall ml-3" @click="createSignal(true)">send offer</button>
<input type="text" class="form-control ml-3 col-2" v-model="room" placeholder="請輸入房號">
<button class="btn btn-primary ml-3" @click="joinRoom">加入房間</button>
<input type="text" class="form-control ml-3 col-2" v-model="text" placeholder="請輸入訊息"
@keypress.enter="sendText">
<button class="btn btn-primary ml-3" @click="sendText">送出訊息</button>
</div>
<div class="row ml-5 border border-info mr-5 position-relative">
<video width="200" height="200" class="rtc" autoplay
id="myVideo" ref="myVideo" muted playsinline></video>
<video width="500" height="500" class="rtc ml-5" autoplay
id="remoteVideo" ref="remoteVideo" playsinline></video>
<div class="col-3 position-absolute" style="top: 250px">
<button class="btn btn-info ml-1" @click="closeTrack('audio', !audioTracks[0].enabled)">
{{ audioTracks && audioTracks[0].enabled ? '音訊On': '音訊Off' }}
</button>
<button class="btn btn-info ml-3" @click="closeTrack('video', !videoTracks[0].enabled)">
{{ videoTracks && videoTracks[0].enabled ? '視訊On': '視訊Off' }}
</button>
</div>
</div>
</div>
<script>
const socket = io('http://localhost:3000');
const app = new Vue({
el: '#app',
data: {
localstream: null,
pc: null,
videoTracks: null,
audioTracks: null,
configuration: {
iceServers: [{
urls: 'stun:stun.l.google.com:19302' // Google's public STUN server
}]
},
signalOption: {
offerToReceiveAudio: 1,
offerToReceiveVideo: 1
},
offer: null,
room: null,
text: null,
},
created() {
this.onSocket();
},
methods: {
async initPeerConnection() {
await this.createMedia();
this.getAudioVideo();
this.createPeerConnection();
this.addLocalStream();
this.onIceCandidates();
this.onIceconnectionStateChange();
this.onAddStream();
},
async createMedia() {
// 儲存本地流到全域
this.localstream = await window.navigator.mediaDevices.getUserMedia({ audio: true, video: true })
this.$refs.myVideo.srcObject = this.localstream;
},
// 取得裝置名稱
getAudioVideo() {
this.videoTracks = this.localstream.getVideoTracks();
this.audioTracks = this.localstream.getAudioTracks();
if (this.videoTracks.length > 0) {
console.log(`影像配置: ${this.videoTracks[0].label}`)
};
if (this.audioTracks.length > 0) {
console.log(`聲音配置: ${this.audioTracks[0].label}`)
};
},
createPeerConnection() {
// 建立 P2P 連接
this.pc = new RTCPeerConnection(this.configuration);
console.log(`建立 peer connection`);
},
addLocalStream(){
// 增加本地流
this.pc.addStream(this.localstream)
},
onIceCandidates() {
// 監聽 Ice Server
// 找尋到 ICE 候選位置後，送去 server 與另一位配對
this.pc.onicecandidate = ({ candidate }) => {
if (!candidate) { return; }
console.log('onIceCandidate => ', candidate);
socket.emit("peerconnectSignaling", {
candidate,
to: 'jedy-0',
from: 'hiro-1',
room: '0509'
});
};
},
onIceconnectionStateChange() {
// 監聽 Ice 連接狀態
this.pc.oniceconnectionstatechange = (evt) => {
console.log('ICE 伺服器狀態變更 => ', evt.target.iceConnectionState);
};
},
onAddStream() {
// 監聽是否有流傳入，如果有的話就顯示影像
this.pc.onaddstream = (event) => {
console.log('this => ', this)
if(!this.$refs.remoteVideo.srcObject && event.stream){
this.$refs.remoteVideo.srcObject = event.stream;
console.log('接收流並顯示於遠端視訊！', event);
}
}
},
// --------------
sendSignalingMessage(desc, offer) {
const isOffer = offer ? "offer" : "answer";
console.log(`寄出 ${isOffer}`);
socket.emit("peerconnectSignaling", {
desc: desc,
to: 'jedy-0',
from: 'hiro-1',
room: '0509'
});
},
async createSignal(isOffer) {
try {
if (!this.pc) {
console.log('尚未開啟視訊')
return;
}
this.offer = await this.pc[`create${isOffer ? 'Offer' : 'Answer'}`](this.signalOption);
await this.pc.setLocalDescription(this.offer);
this.sendSignalingMessage(this.pc.localDescription, isOffer ? true : false)
} catch(err) {
console.log(err);
}
},
onSocket() {
const vm = this;
socket.on('peerconnectSignaling', async ({ desc, from, candidate }) => {
if (desc && !vm.pc.currentRemoteDescription) {
console.log('desc => ', desc);
await vm.pc.setRemoteDescription(new RTCSessionDescription(desc));
await vm.createSignal(desc.type === 'answer' ? true : false);
} else if (candidate) {
console.log('candidate =>', candidate);
vm.pc.addIceCandidate(new RTCIceCandidate(candidate));
}
});
socket.on('message', message => {
console.log('房間接收 => ', message);
});
socket.on('roomBroadcast', message => {
console.log('房間廣播 => ', message);
});
},
joinRoom() {
if (!this.room) {
return;
}
socket.emit('joinRoom', this.room);
this.room = null;
},
sendText() {
if (!this.text) {
return;
}
socket.emit('message', this.text);
this.text = null;
},
closeTrack(trackName, isOpen) {
// console.log(this.videoTracks);
this[`${trackName}Tracks`][0].enabled = isOpen
this[`${trackName}Tracks`] = this.localstream[trackName === 'video'? 'getVideoTracks' : 'getAudioTracks']()
}
},
});
</script>
<style>
#myVideo{
width: 200px;
height: 200px;
background: rgba(141, 167, 167, 0.178);
transform: scaleX(-1);
}
#remoteVideo{
width: 500px;
height: 500px;
background: rgba(141, 167, 143, 0.178);
}
</style>
</body>
</html>
之後成功用 WebRTC 做視訊聊天
今年小弟第一次參加 `鐵人賽` , 如文章有誤 , 請各位前輩提出指正 , 感謝 <(_ _)>
iThome鐵人賽
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