基于SignalR视频聊天 一

环境 VS2022 WIN10 .NET8    VSCode VUE SignalR

1.安装SignalR客户端库

需要在Vue.js项目中安装SignalR客户端库。可以使用npm或者yarn来安装

npm install @microsoft/signalr

2.创建SignalR服务

创建SignalR服务，以便客户端（Vue.js应用）能够连接并与之通信

<script>
import * as signalR from "@microsoft/signalr";

export default {
  data() {
    return {
      connection: null,
      connected: false,
      inCall: false,
      localStream: null,
      remoteStream: null,
      peerConnection: null
    };
  },
  mounted() {
    this.connection = new signalR.HubConnectionBuilder()
      .withUrl("/chathubv")
      .configureLogging(signalR.LogLevel.Information)
      .build();

    this.connection.start().then(() => {
      console.log("SignalR Connected");
      this.connected = true;
    }).catch((error) => {
      console.error("SignalR Connection Error: ", error);
    });
  },
  methods: {
    async startCall() {
      this.localStream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
      this.$refs.localVideo.srcObject = this.localStream;

      this.peerConnection = new RTCPeerConnection();
      this.peerConnection.addStream(this.localStream);

      this.peerConnection.onaddstream = (event) => {
        this.remoteStream = event.stream;
        this.$refs.remoteVideo.srcObject = this.remoteStream;
      };

      const offer = await this.peerConnection.createOffer();
      await this.peerConnection.setLocalDescription(offer);

      this.connection.invoke("SendOffer", offer);
      this.inCall = true;
    },
    async endCall() {
      this.localStream.getTracks().forEach(track => track.stop());
      this.remoteStream.getTracks().forEach(track => track.stop());
      this.peerConnection.close();
      this.inCall = false;
    }
  }
}
</script>

3.处理视频流组件

Vue组件

<template>
  <div id="app">
    <div v-if="!connected">Connecting to SignalR...</div>
    <div v-else>
      <div v-if="!inCall">
        <button @click="startCall">Start Call</button>
      </div>
      <div v-else>
        <video ref="localVideo" autoplay></video>
        <video ref="remoteVideo" autoplay></video>
        <button @click="endCall">End Call</button>
      </div>
    </div>
  </div>
</template>

4.服务端信令交换

using Microsoft.AspNetCore.SignalR;

namespace WebSignalR
{

        public class ChatHubv : Hub
        {
            public async Task SendOffer(string offer)
            {
                await Clients.All.SendAsync("ReceiveOffer", offer);
            }

            public async Task SendAnswer(string answer)
            {
                await Clients.All.SendAsync("ReceiveAnswer", answer);
            }

            public async Task SendIceCandidate(string candidate)
            {
                await Clients.All.SendAsync("ReceiveIceCandidate", candidate);
            }
        }
    

}

public async Task SendOffer(string offer): 用于接收客户端发送的"offer"信令。

await Clients.All.SendAsync("ReceiveOffer", offer): 在接收到"offer"信令后，会调用 Clients.All.SendAsync 方法将"offer"信令发送给所有连接到当前Hub的客户端。第一个参数是要调用的客户端方法的名称（"ReceiveOffer"），第二个参数是要发送的数据（offer）。

5.Runing

this.connection.start() ... 

看到 控制台输出 SignalR Connected 说明和SignalR服务器连接上了