Hi everyone, in this post we will build a basic video call web using WebRTC,Angular and ASP.Net Core. Why? because this technologies are like read meat and malbec, their just pair well (I will write a post about this). This is going to be a very basic app with a lot of point for improvement but I will focus on basics.
WebRTC 'Supports video, voice, and generic data to be sent between peers', but as in any p2p system we need a signaling communication channel so users can discover each other, we will user singlaR for that.
The git repos are at the end of the post.
Lets begin with Backend
We only need a signaling server so create a .Net Core web api project and add singalR nuget package
dotnet new webapp -o signalRtc
cd signalRtc
dotnet add package Microsoft.AspNetCore.SignalR.Core
You could remove the controller folder that is created.
Now we need a hub, as docs saids, a hub 'allows a client and server to call methods on each other', I like to think that we invoke methods from frontend and listen to event from backend. So create a hubs folder and a class that extends Hub.
using System.Text.Json;
using System.Threading.Tasks;
using Microsoft.AspNetCore.SignalR;
using signalRtc.models;
namespace signalRtc.hubs
{
public class SignalRtcHub : Hub
{
}
}
There are 3 (or 4) basic actions that we need in order to make a video call app.
- Every new user need to notify they arrival.
- Existing users need to inform their presence to new user.
- Share signaling data between peers for WebRTC.
- Notify users when someone disconnect.
As I said, we are going to write task in the hub class that can be executed from the Angular project and send some data to frontend too.
First create a folder models with a UseInfo class to encapsulate user data
namespace signalRtc.models
{
public class UserInfo
{
public string userName { get; set; }
public string connectionId { get; set; }
}
}
The connectionId it's an unique identifier that signlarR give to each connected user so we can identify they, we will need it to send messages to that specific user.
Point #1
public async Task NewUser(string username)
{
var userInfo = new UserInfo() { userName = username, connectionId = Context.ConnectionId };
await Clients.Others.SendAsync("NewUserArrived", JsonSerializer.Serialize(userInfo));
}
In this short piece of code we use many of the signalR great features. The task is the action that we can invoke from frontend, there we create a User object with the current user id that we get from Context. We don't want to receive our "hello I'm a new user" so we send the message to "others", that means all users connected to the hub but not me, signalR keep the list of user for us. The "NewUserArrived" string is an identifier that we will use later in frontend to receive this messages, you could write any name you like.
Point #2 When we get the "NewUser" message, we need to inform of our existence to the new user with a hello.
public async Task HelloUser(string userName, string user)
{
var userInfo = new UserInfo() { userName = userName, connectionId = Context.ConnectionId };
await Clients.Client(user).SendAsync("UserSaidHello", JsonSerializer.Serialize(userInfo));
}
The task receive two parameters, the username of the user that is saying hello and the user that we are saluting. In order to send a message to one user, we use Clients.Client('connectionId')... In this case, we are sending a "UserSaidHello" event to frontend.
Point #3 is simple, we want to send our signal to a user to start a p2p videocall
public async Task SendSignal(string signal, string user)
{
await Clients.Client(user).SendAsync("SendSignal", Context.ConnectionId, signal);
}
Last but not essential, we want to inform to the group when a user disconnect, to do that we are going to override the onDisconnect task.
public override async Task OnDisconnectedAsync(System.Exception exception)
{
await Clients.All.SendAsync("UserDisconnect", Context.ConnectionId);
await base.OnDisconnectedAsync(exception);
}
We are almost done with backend, we need to indicate to NetCore that we are using singlaR so in the Startup.cs add singalR in configureService (also cors for angular port) and an endpoint for the singalR communication
public void ConfigureServices(IServiceCollection services)
{
services.AddCors(options =>
{
options.AddPolicy(MyAllowSpecificOrigins,
builder => builder.WithOrigins("http://localhost:4200", "https://localhost:4200")
.AllowAnyMethod()
.AllowAnyHeader()
.AllowCredentials());
});
services.AddSignalR();
}
readonly string MyAllowSpecificOrigins = "AllowOrigins";
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseRouting();
app.UseCors(MyAllowSpecificOrigins);
app.UseEndpoints(endpoints =>
{
endpoints.MapHub<SignalRtcHub>("/signalrtc");
});
app.Run(async(context) =>
{
await context.Response.WriteAsync("Hello World!");
});
}
Lets move to Angular
First create a new Angular project and install few dependencies.
simple-peer (and its types, because we love static type checking) for WebRTC.
Bootrstap, because I know you could do everything with plain css and flex or grid, but I like bootstrap.
SignalR, to invoke the method we just wrote and receive the messages.
Remember to choose scss when cli ask.
ng new signalRtc
cd signalRtc
npm install simple-peer
npm install @types/simple-peer
npm install bootstrap
npm install @aspnet/signalr
To add sytles, open styles.scss and add "@import '~bootstrap/dist/css/bootstrap.min.css';"
First lets create a service to manage the singalR messages.
cd src/app
ng g service signalr
We need a private property to maintain the hub connection, we also need subjects and observables to encapsulate the events from signalR library. I like to have private subjects to emit values via methods and public observables to get data in components.
private hubConnection: signalR.HubConnection;
private newPeer = new Subject<UserInfo>();
public newPeer$ = this.newPeer.asObservable();
private helloAnswer = new Subject<UserInfo>();
public helloAnswer$ = this.helloAnswer.asObservable();
private disconnectedPeer = new Subject<UserInfo>();
public disconnectedPeer$ = this.disconnectedPeer.asObservable();
private signal = new Subject<SignalInfo>();
public signal$ = this.signal.asObservable();
As you can see, we have an observable for every task and some interfaces that you could write in a separate file
export interface PeerData {
id: string;
data: any;
}
export interface UserInfo {
userName: string;
connectionId: string;
}
export interface SignalInfo {
user: string;
signal: any;
}
Now we will write some methods, we need one to start a connection, one for response to the new user message and one to send the p2p signal
Start a connection
public async startConnection(currentUser: string): Promise<void> {
this.hubConnection = new signalR.HubConnectionBuilder()
.withUrl('https://localhost:5001/signalrtc')
.build();
await this.hubConnection.start();
console.log('Connection started');
this.hubConnection.on('NewUserArrived', (data) => {
this.newPeer.next(JSON.parse(data));
});
this.hubConnection.on('UserSaidHello', (data) => {
this.helloAnswer.next(JSON.parse(data));
});
this.hubConnection.on('UserDisconnect', (data) => {
this.disconnectedPeer.next(JSON.parse(data));
});
this.hubConnection.on('SendSignal', (user, signal) => {
this.signal.next({ user, signal });
});
this.hubConnection.invoke('NewUser', currentUser);
}
As you can see from code, we start the connection and encapsulate the message events in observables, also when we start a connection we send the 'Hello I'm a new user' message. That's the two way communication with backend, via invoke we execute task and receive data with 'on'.
Now to say hello new user and send signal data, we only need to invoke hub methods
public sendSignalToUser(signal: string, user: string) {
this.hubConnection.invoke('SendSignal', signal, user);
}
public sayHello(userName: string, user: string): void {
this.hubConnection.invoke('HelloUser', userName, user);
}
Now we are going to write a rtc service, similar to the signalR one, to encapsulate the simplee-peer events. We also need to maintain the list of connected users to start a conversation and the current peer we are talking to.
import { Injectable } from '@angular/core';
import { Observable, Subject, BehaviorSubject } from 'rxjs';
import { Instance } from 'simple-peer';
declare var SimplePeer: any;
@Injectable({
providedIn: 'root'
})
export class RtcService {
private users: BehaviorSubject<Array<UserInfo>>;
public users$: Observable<Array<UserInfo>>;
private onSignalToSend = new Subject<PeerData>();
public onSignalToSend$ = this.onSignalToSend.asObservable();
private onStream = new Subject<PeerData>();
public onStream$ = this.onStream.asObservable();
private onConnect = new Subject<PeerData>();
public onConnect$ = this.onConnect.asObservable();
private onData = new Subject<PeerData>();
public onData$ = this.onData.asObservable();
public currentPeer: Instance;
constructor() {
this.users = new BehaviorSubject([]);
this.users$ = this.users.asObservable();
}
}
When a user arrives, we add it to the list, and when they disconnect, we remove it (always in an immutable way), let’s add some methods in service for that
public newUser(user: UserInfo): void {
this.users.next([...this.users.getValue(), user]);
}
public disconnectedUser(user: UserInfo): void {
const filteredUsers = this.users.getValue().filter(x => x.connectionId === user.connectionId);
this.users.next(filteredUsers);
}
When we start a conversation, we need to create a peer instance. The simple peer library need and indication to know if we are initiating the p2p connection. It also provide some events that we will encapsulate (because we love observables). The most important event is 'signal', quoting the library description: 'Fired when the peer wants to send signaling data to the remote peer.
It is the responsibility of the application developer (that's you!) to get this data to the other peer' that's the whole point of signalR
public createPeer(stream, userId: string, initiator: boolean): Instance {
const peer = new SimplePeer({ initiator, stream });
peer.on('signal', data => {
const stringData = JSON.stringify(data);
this.onSignalToSend.next({ id: userId, data: stringData });
});
peer.on('stream', data => {
console.log('on stream', data);
this.onStream.next({ id: userId, data });
});
peer.on('connect', () => {
this.onConnect.next({ id: userId, data: null });
});
peer.on('data', data => {
this.onData.next({ id: userId, data });
});
return peer;
}
Finally, we have a method to signal a peer Instance, this actions is required by simple-peer. We have to check if exist a current peer, if it don't, it means that we are not the initiator and we have to create it because someone is staring a videocall with us
public signalPeer(userId: string, signal: string, stream: any) {
const signalObject = JSON.parse(signal);
if (this.currentPeer) {
this.currentPeer.signal(signalObject);
} else {
this.currentPeer = this.createPeer(stream, userId, false);
this.currentPeer.signal(signalObject);
}
}
public sendMessage(message: string) {
this.currentPeer.send(message);
}
We also create a sendMessage for the chat part, because WebRTC allow to send binary data between peers. We could have used signalR but we only want it as a signaling server.
Now let's change app.component.htm, we will add an input for our username and a place for a chat. Following good practice, we will make a special component to manage the connected users list to keep a place for that.
<div class="container-fluid">
<h1>SignalRTC</h1>
<div class="row">
<div class="col-5">
<div class="row">
<div class="col">
<input [(ngModel)]="currentUser" required placeholder="UserName" type="text">
</div>
<div class="col">
<div class="btn-group" role="group" aria-label="button group">
<button [disabled]="!currentUser" (click)="saveUsername()" type="button"
class="btn btn-sm btn-primary">Save</button>
</div>
</div>
</div>
<div class="row">
<div class="col">
<!-- user list component -->
</div>
</div>
</div>
<div class="col-7">
<div class="row">
<div class="col-8">
<input [(ngModel)]="dataString" required placeholder="Write a message" type="text">
</div>
<div class="col-4">
<button (click)="sendMessage()" type="button" class="btn btn-sm btn-secondary">Send</button>
</div>
</div>
</div>
</div>
</div>
This is the list component,just a simple list where we can click an user in order to start a videocall, the component will emit an event so we can react in the app component.
<ul class="list-group mt-4">
<li class="list-group-item" (click)="userClicked(user)" *ngFor="let user of users$ | async">
{{user.userName}}
</li>
</ul>
@Output() userSelected: EventEmitter<UserInfo> = new EventEmitter();
public users$: Observable<Array<UserInfo>>;
constructor(private rtcService: RtcService) { }
ngOnInit() {
this.users$ = this.rtcService.users$;
}
public userClicked(user: UserInfo) {
this.userSelected.emit(user);
}
Now you can change the app.component.html and replace the comment for the actual list component.
<app-user-list (userSelected)="onUserSelected($event)"></app-user-list>
In the component, we will use the OnInit method (in Angular we have to keep constructor clean) to suscribe to all the obserable we defined and disptach the actions we need.
ngOnInit() {
this.subscriptions.add(this.signalR.newPeer$.subscribe((user: UserInfo) => {
this.rtcService.newUser(user);
this.signalR.sayHello(this.currentUser, user.connectionId);
}));
this.subscriptions.add(this.signalR.helloAnswer$.subscribe((user: UserInfo) => {
this.rtcService.newUser(user);
}));
this.subscriptions.add(this.signalR.disconnectedPeer$.subscribe((user: UserInfo) => {
this.rtcService.disconnectedUser(user);
}));
this.subscriptions.add(this.signalR.signal$.subscribe((signalData: SignalInfo) => {
this.rtcService.signalPeer(signalData.user, signalData.signal, this.stream);
}));
this.subscriptions.add(this.rtcService.onSignalToSend$.subscribe((data: PeerData) => {
this.signalR.sendSignalToUser(data.data, data.id);
}));
this.subscriptions.add(this.rtcService.onData$.subscribe((data: PeerData) => {
console.log(`Data from user ${data.id}: ${data.data}`);
}));
this.subscriptions.add(this.rtcService.onStream$.subscribe((data: PeerData) => {
this.userVideo = data.id;
this.videoPlayer.nativeElement.srcObject = data.data;
this.videoPlayer.nativeElement.load();
this.videoPlayer.nativeElement.play();
}));
}
Brief explanation of each step:
- When a user arrives, we add create a new user and send our hell message.
- When we receive a hello, we add the user to the list.
- When a user disconnect, we remove it from the list.
- When when receive a signal we execute the function .signal that it's indicated in the simple-peer documentation.
- When simple-peer indicate that the WeRTC signal is ready, we send it to the user.
- When we receive a message, we show it.
- Finally, when the videostream is ready, we show it in a video tag.
Finally, when we click a user, we create a new peer, this will eventually fire the signal event!
We also have the function to save the username and send a message via the data channel. Also unsubscribe always on the OnDestroy lifecycle hook, in this case we have only one component but following this practice we will prevent memory leaks.
public onUserSelected(userInfo: UserInfo) {
const peer = this.rtcService.createPeer(this.stream, userInfo.connectionId, true);
this.rtcService.currentPeer = peer;
}
public async saveUsername(): Promise<void> {
try {
await this.signalR.startConnection(this.currentUser);
this.stream = await navigator.mediaDevices.getUserMedia({ video: true, audio: true });
} catch (error) {
console.error(`Can't join room, error ${error}`);
}
}
public sendMessage() {
this.rtcService.sendMessage(this.dataString);
this.messages = [...this.messages, { own: true, message: this.dataString }];
this.dataString = null;
}
ngOnDestroy() {
this.subscriptions.unsubscribe();
}
Okey, that's all folks. As I told you at the beginning, this is a very simple starting point. We have a lot to improve, for example you could use signalR to ask to the other user if they want to accept the call! I wanted to keep it simple.
Frontend:
sebalr
/
signalrtc-frontend
WebRTC client example
Backend:
Latest comments (86)
Hi Sebastian,
I am working on a project for building the Video Conference site .. and your Article helped me a lot in Implementing this feature ..
I have one question ..
Please can you let me know how to show videos of both the users in the same window .. just like the Zoom conference or Google meet .. where both the users can see the there video and other person video also
could you demo a video chat group use this technology
If You pay me
@sebastian , great post , it works as explaination without any issue. thanks.
Can you help how to make a group call and chat similar to this . I need to create group call app.
I downloaded your angular project from github and execute these commands in vscode terminal : npm install , npm start
but It shows error :
Unknown error: SyntaxError: Unexpected token 'export'
npm ERR! code 127
npm ERR! path D:\Projects\signalrtc-frontend-master
npm ERR! command failed
npm ERR! command C:\WINDOWS\system32\cmd.exe /d /s /c ng serve
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\mammadkoma\AppData\Local\npm-cache_logs\2021-02-18T16_32_06_791Z-debug.log
Weird, try deleting node_modules and package.lock and run npm install again
I did it. but it give us error :
D:\Projects\signalrtc-frontend-master>npm start
An unhandled exception occurred: Could not find module "@angular-devkit/build-angular" from "D:\Projects\signalrtc-frontend-master".
See "C:\Users\MAMMAD~1\AppData\Local\Temp\ng-ggaBwX\angular-errors.log" for further details.
npm ERR! code 127
npm ERR! path D:\Projects\signalrtc-frontend-master
npm ERR! command failed
npm ERR! command C:\WINDOWS\system32\cmd.exe /d /s /c ng serve
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\mammadkoma\AppData\Local\npm-cache_logs\2021-02-18T16_38_33_449Z-debug.log
after run npm update , it show this error now :
D:\Projects\signalrtc-frontend-master>npm start
Unknown error: SyntaxError: Unexpected token 'export'
npm ERR! code 127
npm ERR! path D:\Projects\signalrtc-frontend-master
npm ERR! command failed
npm ERR! command C:\WINDOWS\system32\cmd.exe /d /s /c ng serve
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\mammadkoma\AppData\Local\npm-cache_logs\2021-02-18T16_48_13_596Z-debug.log
Install that dependency manually, maybe is missing from package.json
After update nodejs and npm and angular and change these packages version it started:
"@angular-devkit/build-angular": "~0.1102.1",
"@angular/cli": "~11.2.1",
"@angular/compiler-cli": "~11.2.1",
"@angular/language-service": "~11.0.7",
"@types/jasmine": "~3.6.0",
"@types/jasminewd2": "~2.0.3",
"@types/node": "^12.11.1",
"codelyzer": "^6.0.0",
"jasmine-core": "~3.6.0",
"jasmine-spec-reporter": "~5.0.0",
"karma": "~6.1.0",
"karma-chrome-launcher": "~3.1.0",
"karma-coverage-istanbul-reporter": "~3.0.2",
"karma-jasmine": "~4.0.0",
"karma-jasmine-html-reporter": "^1.5.0",
"protractor": "~7.0.0",
"ts-node": "~8.3.0",
"tslint": "~6.1.0",
"typescript": "~4.1.2"
I Started angular by command prompt and SignalRtc.exe (in signalrtc-backend-master\bin\Debug\netcoreapp3.1)
chrome and edge asked me to access camera and microphone and I clicked allow.
Text sends but voice and video not.
(my camera light on my laptop is on now)
If text is working it means connection between peers has been stablished. I'm not sure what your problems could be, there is any log on console.?
text shows twice.
log in dotnetcore console :
Now listening on: localhost:5000
Now listening on: localhost:5001
Application started. Press Ctrl+C to shut down.
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
Request starting HTTP/2 OPTIONS localhost:5001/signalrtc/negotiate
info: Microsoft.AspNetCore.Cors.Infrastructure.CorsService[4]
CORS policy execution successful.
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
Request finished in 36.3844ms 204
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
Request starting HTTP/2 POST localhost:5001/signalrtc/negotiate text/plain;charset=UTF-8 0
info: Microsoft.AspNetCore.Cors.Infrastructure.CorsService[4]
CORS policy execution successful.
info: Microsoft.AspNetCore.Routing.EndpointMiddleware[0]
Executing endpoint '/signalrtc/negotiate'
info: Microsoft.AspNetCore.Routing.EndpointMiddleware[1]
Executed endpoint '/signalrtc/negotiate'
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
Request finished in 16.5687ms 200 application/json
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
Request starting HTTP/1.1 GET localhost:5001/signalrtc?id=sHQhov...
info: Microsoft.AspNetCore.Cors.Infrastructure.CorsService[4]
CORS policy execution successful.
info: Microsoft.AspNetCore.Routing.EndpointMiddleware[0]
Executing endpoint '/signalrtc'
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
Request starting HTTP/2 OPTIONS localhost:5001/signalrtc/negotiate
info: Microsoft.AspNetCore.Cors.Infrastructure.CorsService[4]
CORS policy execution successful.
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
Request finished in 2.0513ms 204
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
Request starting HTTP/2 POST localhost:5001/signalrtc/negotiate text/plain;charset=UTF-8 0
info: Microsoft.AspNetCore.Cors.Infrastructure.CorsService[4]
CORS policy execution successful.
info: Microsoft.AspNetCore.Routing.EndpointMiddleware[0]
Executing endpoint '/signalrtc/negotiate'
info: Microsoft.AspNetCore.Routing.EndpointMiddleware[1]
Executed endpoint '/signalrtc/negotiate'
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
Request finished in 2.5617ms 200 application/json
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
Request starting HTTP/1.1 GET localhost:5001/signalrtc?id=LMcT0h...
info: Microsoft.AspNetCore.Cors.Infrastructure.CorsService[4]
CORS policy execution successful.
info: Microsoft.AspNetCore.Routing.EndpointMiddleware[0]
Executing endpoint '/signalrtc'
I was asking for browser console.
You need to create nicknames on differents browsers and then in one, and only one, browser select the other user
edge :
Uncaught TypeError: Cannot redefine property: BetterJsPop
at Function.defineProperty ()
at inject (:5:4295)
at :6:11
at :7:11
core.js:27701 Angular is running in development mode. Call enableProdMode() to enable production mode.
client:52 [WDS] Live Reloading enabled.
Utils.js:209 [2021-02-18T18:16:07.552Z] Information: WebSocket connected to wss://localhost:5001/signalrtc?id=LMcT0hNHw5mAjC1P3uc1nw.
signalr.service.ts:34 Connection started
app.component.ts:80 Can't join room, error NotReadableError: Could not start video source
(anonymous) @ app.component.ts:80
Utils.js:209 [2021-02-18T18:17:01.203Z] Information: WebSocket connected to wss://localhost:5001/signalrtc?id=A8Wi87etl-9F4qo6nh6EFw.
signalr.service.ts:34 Connection started
app.component.ts:80 Can't join room, error NotReadableError: Could not start video source
(anonymous) @ app.component.ts:80
Utils.js:203 [2021-02-18T18:19:11.011Z] Error: Connection disconnected with error 'Error: WebSocket closed with status code: 1006 ().'.
push.yfcC.ConsoleLogger.log @ Utils.js:203
Utils.js:203 [2021-02-18T18:19:11.012Z] Error: Connection disconnected with error 'Error: WebSocket closed with status code: 1006 ().'.
push.yfcC.ConsoleLogger.log @ Utils.js:203
chrome :
Uncaught TypeError: Cannot redefine property: BetterJsPop
at Function.defineProperty ()
at inject (:5:4295)
at :6:11
at :7:11
core.js:27701 Angular is running in development mode. Call enableProdMode() to enable production mode.
contentscript.js:58 …
client:52 [WDS] Live Reloading enabled.
Utils.js:209 [2021-02-18T18:16:00.238Z] Information: WebSocket connected to wss://localhost:5001/signalrtc?id=sHQhovh_QYbqS7kkCHzolw.
signalr.service.ts:34 Connection started
Utils.js:203 [2021-02-18T18:19:11.008Z] Error: Connection disconnected with error 'Error: WebSocket closed with status code: 1006 ().'.
There is an error in the websoket connection as you could see in last line. You will have to Google that, it may be related to security in your browser
oops , I must click on a text in list , now I have see my video
but after publish back and front on a linux server it not working!
Is hard to tell without a little more context. In order to work you must have ssl on your servers. Also you may have to enable wss communication, it may be a nat error or any other things
After publish on windows server 2012 and iis 8 , error on chrome console :
WebSocket connection to 'ws://5.160.146.56/sockjs-node/182/aa2hoasq/websocket' failed: Error during WebSocket handshake: Unexpected response code: 200
WebSocketBrowserDriver @ sockjs.js:1684
WebSocketTransport @ sockjs.js:2959
SockJS._connect @ sockjs.js:829
SockJS._receiveInfo @ sockjs.js:803
g @ sockjs.js:66
EventEmitter.emit @ sockjs.js:86
(anonymous) @ sockjs.js:567
g @ sockjs.js:66
EventEmitter.emit @ sockjs.js:86
(anonymous) @ sockjs.js:374
g @ sockjs.js:66
EventEmitter.emit @ sockjs.js:86
xhr.onreadystatechange @ sockjs.js:1598
wrapFn @ zone-evergreen.js:1218
invokeTask @ zone-evergreen.js:399
runTask @ zone-evergreen.js:167
invokeTask @ zone-evergreen.js:480
invokeTask @ zone-evergreen.js:1621
globalZoneAwareCallback @ zone-evergreen.js:1647
client:169 Invalid Host/Origin header
error @ client:169
(anonymous) @ socket.js:47
sock.onmessage @ SockJSClient.js:67
EventTarget.dispatchEvent @ sockjs.js:170
(anonymous) @ sockjs.js:888
SockJS._transportMessage @ sockjs.js:886
EventEmitter.emit @ sockjs.js:86
(anonymous) @ sockjs.js:2203
EventEmitter.emit @ sockjs.js:86
(anonymous) @ sockjs.js:2148
EventEmitter.emit @ sockjs.js:86
EventSourceReceiver.es.onmessage @ sockjs.js:2251
client:172 [WDS] Disconnected!
Publish on win server 2012 and iis 8 , chrome console :
WebSocket connection to 'ws://5.160.146.56/sockjs-node/182/aa2hoasq/websocket' failed: Error during WebSocket handshake: Unexpected response code: 200
client:169 Invalid Host/Origin header
client:172 [WDS] Disconnected!
Ok , Thanks I will add https and test it.
hi, greate post it helped me a lot, but what if want to share the same video with multiple users, like noly first connection can start the broadcast and when others entered the connection they will be able to show the broadcast .. do you have any idea? to be more clear user x will start the streaming the other users let us say c,v,b and n ... can see the live streaming video of user x.
Hi, you have to identify your broadcaster, lets say user X, then every new user will send a message to the server for a new connection, user X will be listening for that message and start a new connection for that peer.
That for one to to many. If you need all to communicate you will need to do a star network, there is an example in simple peer docs.
User X will have a list of peers to send data and the rest of the user will only have one peer
Hi,
Thanks for this post which helped me a lot in understanding webrtc. Could you please help me to solve below issue?
I also downgraded the version of Typescript from 4 to 3.5.3. , same as yours which didn't work.
Error: src/app/rtc.service.ts:31:5 - error TS2322: Type 'BehaviorSubject' is not assignable to type 'BehaviorSubject'.
Types of property 'observers' are incompatible.
Type 'Observer[]' is not assignable to type 'Observer[]'.
Type 'Observer' is not assignable to type 'Observer'.
Type 'UserInfo[]' is not assignable to type 'never[]'.
Is hard to tell without looking your code. You may have two differents versions of rxjs installed or you are importing behaviourSubject from the wrong place.
Or maybe something changes on RTC library and is returning something different
It is exactly your code. I have made no changes,
There were some other errors which could be fixed. For example, I had to add type "any" for "data" as parameter of all peer.on() event listeners.
It may be related to some TS or Angular upgrade. Try changing the empty array param in line 31 to a new types empty array.
Instead of [] change to new Array with UserInfo as type between <<>>
Thanks for sharing.
Hi..it was a good sample.
I m getting "SimplePeer is not defined" error when i click the user in both browser window. Can any one suggest me what is the problem in it. I implemented exactly like this. This was the error i am getting on it.
Please give me a solution ASP...
SimplePeer is not defined error and Cannot read property 'send' of undefined this error too.
i opened 2 browser and got 2 username also.video was not showing..please help me.
hi...i got this error when i implemented exactly like the github repo.
hey,
cd src/app
ng g service signalr
after this the src/app/signalr.service.spec.ts , src/app/signalr.service.ts
are created but where i can find this files not able to find it
hi,
i want to Video call integrate in asp.net c# core so how to please guid me
Hi, What did you do?
Where are you having problems?
I can help you if you have a particular problem but I'm not a tutor
my asp.net core project new Implement of Video call Option so how to do, can you help me ?
Well, this tutorial show how to integrate video call in Angular using Net Core as signaling service so that's how you do it, if you are not using Angular you could still use the rest of the code as signalR and rtc are pure js libraries.
I'm definitely not going to do your work but if you have a specific questions I will be happy to help.
Yes, But Video call option without Angular can be Integrate in asp.net core ? if yes, then how to do and all steps give me by code for Add Video call option in Project.
As I mentioned, signalR and simple-peer are js libraries and web-rtc is available in every modern web browser so yes, you could use them in any fronted technology
why no screenshots?
How to add stun server url?
I added google stun server to simple-peer and it's not working on diffrent network.
But when i used peerjs with stun server it worked
Hello, how are you? I'm fine, thanks for asking. This is a nice community, no stack overflow, so please be nice.
Your questions make no sense, this to tutorial is about implementing your own signaling server, if you need something different you should read simple peer documentation
very nice man :D, i'm fine too :D
yes this is for signaling.
i read simple-peer documentation, but i could't run it. it has error on connection
Hi. Please I am getting this error:
Access to XMLHttpRequest at 'localhost:5001/signalrtc/negotiate' from origin 'localhost:4200' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: The value of the 'Access-Control-Allow-Origin' header in the response must not be the wildcard '*' when the request's credentials mode is 'include'. The credentials mode of requests initiated by the XMLHttpRequest is controlled by the withCredentials attribute.
can you help me please??
Hi. As the error shows, you have to allow origin localhost:4200 to CORS. Pleas read the tutorial carefully
Hi. As the error show, you have to allow origin localhost:4200 to CORS.
But the fact is that I did it exactly as you did. But it stills showing that error. this is the startup file:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using signalRtc.hubs;
namespace signalRtc
{
public class Startup
{
readonly string MyAllowSpecificOrigins = "AllowOrigins";
}
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