openvidu-angular

Source code

This tutorial is a simple video-call application built with Angular that allows:

• Joining a video call room by requesting a token from any application server.
• Publishing your camera and microphone.
• Subscribing to all other participants' video and audio tracks automatically.
• Leaving the video call room at any time.

It uses the LiveKit JS SDK to connect to the LiveKit server and interact with the video call room.

Running this tutorial

1. Run OpenVidu Server

Run OpenVidu locallyDeploy OpenVidu

1. Download OpenVidu

   git clone https://github.com/OpenVidu/openvidu-local-deployment
   

2. Configure the local deployment

   Windows macOS Linux

   cd openvidu-local-deployment/community
   .\configure_lan_private_ip_windows.bat
   

   cd openvidu-local-deployment/community
   ./configure_lan_private_ip_macos.sh
   

   cd openvidu-local-deployment/community
   ./configure_lan_private_ip_linux.sh
   

3. Run OpenVidu

   docker compose up
   

To use a production-ready OpenVidu deployment, visit the official deployment guide.

2. Download the tutorial code

git clone https://github.com/OpenVidu/openvidu-livekit-tutorials.git

3. Run a server application

Node Go Ruby Java Python Rust PHP .NET

To run this server application, you need Node installed on your device.

1. Navigate into the server directory

   cd openvidu-livekit-tutorials/application-server/node
   

2. Install dependencies

   npm install
   

3. Run the application

   npm start
   

To run this server application, you need Go installed on your device.

1. Navigate into the server directory

   cd openvidu-livekit-tutorials/application-server/go
   

2. Run the application

   go run main.go
   

To run this server application, you need Ruby installed on your device.

1. Navigate into the server directory

   cd openvidu-livekit-tutorials/application-server/ruby
   

2. Install dependencies

   bundle install
   

3. Run the application

   ruby app.rb
   

To run this server application, you need Java and Maven installed on your device.

1. Navigate into the server directory

   cd openvidu-livekit-tutorials/application-server/java
   

2. Run the application

   mvn spring-boot:run
   

To run this server application, you need Python 3 installed on your device.

1. Navigate into the server directory

   cd openvidu-livekit-tutorials/application-server/python
   

2. Create a python virtual environment

   python -m venv venv
   

3. Activate the virtual environment

   Windows macOS Linux

   .\venv\Scripts\activate
   

   . ./venv/bin/activate
   

   . ./venv/bin/activate
   

4. Install dependencies

   pip install -r requirements.txt
   

5. Run the application

   python app.py
   

To run this server application, you need Rust installed on your device.

1. Navigate into the server directory

   cd openvidu-livekit-tutorials/application-server/rust
   

2. Run the application

   cargo run
   

To run this server application, you need PHP and Composer installed on your device.

1. Navigate into the server directory

   cd openvidu-livekit-tutorials/application-server/php
   

2. Install dependencies

   composer install
   

3. Run the application

   composer start
   

To run this server application, you need .NET installed on your device.

1. Navigate into the server directory

   cd openvidu-livekit-tutorials/application-server/dotnet
   

2. Run the application

   dotnet run
   

Warning

This .NET server application needs the LIVEKIT_API_SECRET env variable to be at least 32 characters long. Make sure to update it here and in your OpenVidu Server.

4. Run the client application

To run the client application tutorial, you need Node installed on your development computer.

1. Navigate into the application client directory:

   cd openvidu-livekit-tutorials/application-client/openvidu-angular
   

2. Install the required dependencies:

   npm install
   

3. Serve the application:

   npm start
   

Once the server is up and running, you can test the application by visiting http://localhost:5080. You should see a screen like this:

Accessing your application client from other devices in your local network

One advantage of running OpenVidu locally is that you can test your application client with other devices in your local network very easily without worrying about SSL certificates.

Access your application client through https://xxx-yyy-zzz-www.openvidu-local.dev:5443, where xxx-yyy-zzz-www part of the domain is your LAN private IP address with dashes (-) instead of dots (.). For more information, see section Accessing your app from other devices in your network.

Understanding the code

This Angular project has been created using the Angular CLI tool. You may come across various configuration files and other items that are not essential for this tutorial. Our focus will be on the key files located within the src/app/ directory:

• app.component.ts: This file defines the AppComponent, which serves as the main component of the application. It is responsible for handling tasks such as joining a video call and managing the video calls themselves.
• app.component.html: This HTML file is associated with the AppComponent, and it dictates the structure and layout of the main application component.
• app.component.css: The CSS file linked to AppComponent, which controls the styling and appearance of the application's main component.
• VideoComponent: Component responsible for displaying video tracks along with participant's data. It is defined in the video.component.ts file within the video directory, along with its associated HTML and CSS files.
• AudioComponent: Component responsible for displaying audio tracks. It is defined in the audio.component.ts file within the audio directory, along with its associated HTML and CSS files.

To use the LiveKit JS SDK in an Angular application, you need to install the livekit-client package. This package provides the necessary classes and methods to interact with the LiveKit server. You can install it using the following command:

npm install livekit-client

Now let's see the code of the app.component.ts file:

type TrackInfo = { // (1)!
    trackPublication: RemoteTrackPublication;
    participantIdentity: string;
};

// For local development, leave these variables empty
// For production, configure them with correct URLs depending on your deployment
var APPLICATION_SERVER_URL = ''; // (2)!
var LIVEKIT_URL = ''; // (3)!

@Component({ // (4)!
    selector: 'app-root',
    standalone: true,
    imports: [ReactiveFormsModule, AudioComponent, VideoComponent],
    templateUrl: './app.component.html',
    styleUrl: './app.component.css',
})
export class AppComponent implements OnDestroy {
    roomForm = new FormGroup({ // (5)!
        roomName: new FormControl('Test Room', Validators.required),
        participantName: new FormControl('Participant' + Math.floor(Math.random() * 100), Validators.required),
    });

    room = signal<Room | undefined>(undefined); // (6)!
    localTrack = signal<LocalVideoTrack | undefined>(undefined); // (7)!
    remoteTracksMap = signal<Map<string, TrackInfo>>(new Map()); // (8)!

    constructor(private httpClient: HttpClient) {
        this.configureUrls();
    }

    configureUrls() {
        // If APPLICATION_SERVER_URL is not configured, use default value from local development
        if (!APPLICATION_SERVER_URL) {
            if (window.location.hostname === 'localhost') {
                APPLICATION_SERVER_URL = 'http://localhost:6080/';
            } else {
                APPLICATION_SERVER_URL = 'https://' + window.location.hostname + ':6443/';
            }
        }

        // If LIVEKIT_URL is not configured, use default value from local development
        if (!LIVEKIT_URL) {
            if (window.location.hostname === 'localhost') {
                LIVEKIT_URL = 'ws://localhost:7880/';
            } else {
                LIVEKIT_URL = 'wss://' + window.location.hostname + ':7443/';
            }
        }
    }

1. TrackInfo type, which groups a track publication with the participant's identity.
2. The URL of the application server.
3. The URL of the LiveKit server.
4. Angular component decorator that defines the AppComponent class and associates the HTML and CSS files with it.
5. The roomForm object, which is a form group that contains the roomName and participantName fields. These fields are used to join a video call room.
6. The room object, which represents the video call room.
7. The local video track, which represents the user's camera.
8. Map that links track SIDs with TrackInfo objects. This map is used to store remote tracks and their associated participant identities.

The app.component.ts file defines the following variables:

• APPLICATION_SERVER_URL: The URL of the application server. This variable is used to make requests to the server to obtain a token for joining the video call room.
• LIVEKIT_URL: The URL of the LiveKit server. This variable is used to connect to the LiveKit server and interact with the video call room.
• roomForm: A form group that contains the roomName and participantName fields. These fields are used to join a video call room.
• room: The room object, which represents the video call room.
• localTrack: The local video track, which represents the user's camera.
• remoteTracksMap: A map that links track SIDs with TrackInfo objects. This map is used to store remote tracks and their associated participant identities.

Configure the URLs

For local development, leave APPLICATION_SERVER_URL and LIVEKIT_URL variables empty. The function configureUrls() will automatically configure them with default values. However, for production, you should configure these variables with the correct URLs depending on your deployment.

---

Joining a Room

After the user specifies their participant name and the name of the room they want to join, when they click the Join button, the joinRoom() method is called:

async joinRoom() {
    // Initialize a new Room object
    const room = new Room();
    this.room.set(room); // (1)!

    // Specify the actions when events take place in the room
    // On every new Track received...
    this.room.on(
        RoomEvent.TrackSubscribed,
        (_track: RemoteTrack, publication: RemoteTrackPublication, participant: RemoteParticipant) => { // (2)!
            this.remoteTracksMap.update((map) => {
                map.set(publication.trackSid, {
                    trackPublication: publication,
                    participantIdentity: participant.identity,
                });
                return map;
            });
        }
    );

    // On every new Track destroyed...
    room.on(RoomEvent.TrackUnsubscribed, (_track: RemoteTrack, publication: RemoteTrackPublication) => { // (3)!
        this.remoteTracksMap.update((map) => {
            map.delete(publication.trackSid);
            return map;
        });
    });

    try {
        // Get the room name and participant name from the form
        const roomName = this.roomForm.value.roomName!; // (4)!
        const participantName = this.roomForm.value.participantName!;

        // Get a token from your application server with the room name and participant name
        const token = await this.getToken(roomName, participantName); // (5)!

        // Connect to the room with the LiveKit URL and the token
        await room.connect(LIVEKIT_URL, token); // (6)!

        // Publish your camera and microphone
        await room.localParticipant.enableCameraAndMicrophone(); // (7)!
        this.localTrack.set(room.localParticipant.videoTrackPublications.values().next().value.videoTrack);
    } catch (error: any) {
        console.log(
            'There was an error connecting to the room:',
            error?.error?.errorMessage || error?.message || error
        );
        await this.leaveRoom();
    }
}

1. Initialize a new Room object.
2. Event handling for when a new track is received in the room.
3. Event handling for when a track is destroyed.
4. Get the room name and participant name from the form.
5. Get a token from the application server with the room name and participant name.
6. Connect to the room with the LiveKit URL and the token.
7. Publish your camera and microphone.

The joinRoom() method performs the following actions:

1. It creates a new Room object. This object represents the video call room.

   Info

   When the room object is defined, the HTML template is automatically updated hiding the "Join room" page and showing the "Room" layout.

2. Event handling is configured for different scenarios within the room. These events are fired when new tracks are subscribed to and when existing tracks are unsubscribed.

   • RoomEvent.TrackSubscribed: This event is triggered when a new track is received in the room. It manages the storage of the new track in the remoteTracksMap, which links track SIDs with TrackInfo objects containing the track publication and the participant's identity.

   • RoomEvent.TrackUnsubscribed: This event occurs when a track is destroyed, and it takes care of removing the track from the remoteTracksMap.

   These event handlers are essential for managing the behavior of tracks within the video call. You can further extend the event handling as needed for your application.

   Take a look at all events

   You can take a look at all the events in the Livekit Documentation

3. It retrieves the room name and participant name from the form.

4. It requests a token from the application server using the room name and participant name. This is done by calling the getToken() method:

   /**
    * --------------------------------------------
    * GETTING A TOKEN FROM YOUR APPLICATION SERVER
    * --------------------------------------------
    * The method below request the creation of a token to
    * your application server. This prevents the need to expose
    * your LiveKit API key and secret to the client side.
    *
    * In this sample code, there is no user control at all. Anybody could
    * access your application server endpoints. In a real production
    * environment, your application server must identify the user to allow
    * access to the endpoints.
    */
   async getToken(roomName: string, participantName: string): Promise<string> {
       const response = await lastValueFrom(
           this.httpClient.post<{ token: string }>(APPLICATION_SERVER_URL + 'token', { roomName, participantName })
       );
       return response.token;
   }
   

   This function sends a POST request using HttpClient to the application server's /token endpoint. The request body contains the room name and participant name. The server responds with a token that is used to connect to the room.

5. It connects to the room using the LiveKit URL and the token.

6. It publishes the camera and microphone tracks to the room using room.localParticipant.enableCameraAndMicrophone(), which asks the user for permission to access their camera and microphone at the same time. The local video track is then stored in the localTrack variable.

---

Displaying Video and Audio Tracks

In order to display participants' video and audio tracks, the app.component.html file integrates the VideoComponent and AudioComponent.

<div id="layout-container">
    @if (localTrack()) {
    <video-component
        [track]="localTrack()!"
        [participantIdentity]="roomForm.value.participantName!"
        [local]="true"
    ></video-component>
    }
    @for (remoteTrack of remoteTracksMap().values(); track remoteTrack.trackPublication.trackSid) {
        @if (remoteTrack.trackPublication.kind === 'video') {
        <video-component
            [track]="remoteTrack.trackPublication.videoTrack!"
            [participantIdentity]="remoteTrack.participantIdentity"
        ></video-component>
        } @else {
        <audio-component [track]="remoteTrack.trackPublication.audioTrack!" hidden></audio-component>
        }
    }
</div>

This code snippet does the following:

• We use the Angular @if block to conditionally display the local video track using the VideoComponent. The local property is set to true to indicate that the video track belongs to the local participant.

  Info

  The audio track is not displayed for the local participant because there is no need to hear one's own audio.

• Then, we use the Angular @for block to iterate over the remoteTracksMap. For each remote track, we create a VideoComponent or an AudioComponent depending on the track's kind (video or audio). The participantIdentity property is set to the participant's identity, and the track property is set to the video or audio track. The hidden attribute is added to the AudioComponent to hide the audio tracks from the layout.

Let's see now the code of the video.component.ts file:

// (1)!
@Component({
    selector: 'video-component',
    standalone: true,
    imports: [],
    templateUrl: './video.component.html',
    styleUrl: './video.component.css',
})
export class VideoComponent implements AfterViewInit, OnDestroy {
    videoElement = viewChild<ElementRef<HTMLVideoElement>>('videoElement'); // (2)!

    track = input.required<LocalVideoTrack | RemoteVideoTrack>(); // (3)!
    participantIdentity = input.required<string>(); // (4)!
    local = input(false); // (5)!

    ngAfterViewInit() {
        if (this.videoElement()) {
            this.track().attach(this.videoElement()!.nativeElement); // (6)!
        }
    }

    ngOnDestroy() {
        this.track().detach(); // (7)!
    }
}

1. Angular component decorator that defines the VideoComponent class and associates the HTML and CSS files with it.
2. The reference to the video element in the HTML template.
3. The video track object, which can be a LocalVideoTrack or a RemoteVideoTrack.
4. The participant identity associated with the video track.
5. A boolean flag that indicates whether the video track belongs to the local participant.
6. Attach the video track to the video element when the track is set.
7. Detach the video track when the component is destroyed.

The VideoComponent does the following:

• It defines the properties track, participantIdentity, and local as inputs of the component:

  • track: The video track object, which can be a LocalVideoTrack or a RemoteVideoTrack.
  • participantIdentity: The participant identity associated with the video track.
  • local: A boolean flag that indicates whether the video track belongs to the local participant. This flag is set to false by default.

• It creates a reference to the video element in the HTML template.

• It attaches the video track to the video element when the view is initialized.
• It detaches the video track when the component is destroyed.

Finally, let's see the code of the audio.component.ts file:

// (1)!
@Component({
    selector: 'audio-component',
    standalone: true,
    imports: [],
    templateUrl: './audio.component.html',
    styleUrl: './audio.component.css',
})
export class AudioComponent implements AfterViewInit, OnDestroy {
    audioElement = viewChild<ElementRef<HTMLAudioElement>>('audioElement'); // (2)!

    track = input.required<LocalAudioTrack | RemoteAudioTrack>(); // (3)!

    ngAfterViewInit() {
        if (this.audioElement()) {
            this.track().attach(this.audioElement()!.nativeElement); // (4)!
        }
    }

    ngOnDestroy() {
        this.track().detach(); // (5)!
    }
}

1. Angular component decorator that defines the AudioComponent class and associates the HTML and CSS files with it.
2. The reference to the audio element in the HTML template.
3. The audio track object, which can be a RemoteAudioTrack or a LocalAudioTrack, although in this case, it will always be a RemoteAudioTrack.
4. Attach the audio track to the audio element when view is initialized.
5. Detach the audio track when the component is destroyed.

The AudioComponent class is similar to the VideoComponent class, but it is used to display audio tracks. It attaches the audio track to the audio element when view is initialized and detaches the audio track when the component is destroyed.

---

Leaving the Room

When the user wants to leave the room, they can click the Leave Room button. This action calls the leaveRoom() method:

async leaveRoom() {
    // Leave the room by calling 'disconnect' method over the Room object
    await this.room()?.disconnect(); // (1)!

    // Reset all variables
    this.room.set(undefined); // (2)!
    this.localTrack.set(undefined);
    this.remoteTracksMap.set(new Map());
}

@HostListener('window:beforeunload') // (3)!
async ngOnDestroy() {
    // On window closed or component destroyed, leave the room
    await this.leaveRoom();
}

1. Disconnect the user from the room.
2. Reset all variables.
3. Call the leaveRoom() method when the user closes the browser window or navigates to another page.

The leaveRoom() method performs the following actions:

• It disconnects the user from the room by calling the disconnect() method on the room object.
• It resets all variables.

The window.onbeforeunload event and the ngOnDestroy() lifecycle hook are used to ensure that the user leaves the room when the browser window is closed or the component is destroyed.