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Ionic video call by peerjs

timsar2 profile image timsar2 ・4 min read

Hello,
Before starting, this is ionic 5 angular 9 simple example of video call.
At the end you can connect two device if the app is running on both of them.
if you want to wake up the app first you have to use something like push notification, we don't implement it now.

let do it fast :D

ionic must be installed.

from your console run

ionic start ionic-peer blank

then inside of your project folder, get peerjs:

npm install peerjs --save

add esModuleInterop to your tsconfig.json as below:

"compilerOptions": {
    ....
    "esModuleInterop": true,
    ....
}

create peer service:

ionic generate service providers/webrtc

edit WebrtcService, it'll initiate peer-to-peer connection and make call.

import Peer from 'peerjs';

export class WebrtcService {
  peer: Peer;
  myStream: MediaStream;
  myEl: HTMLMediaElement;
  partnerEl: HTMLMediaElement;

  stun = 'stun.l.google.com:19302';
  mediaConnection: Peer.MediaConnection;
  options: Peer.PeerJSOption;
  stunServer: RTCIceServer = {
    urls: 'stun:' + this.stun,
  };

  constructor() {

    this.options = {  // not used, by default it'll use peerjs server
      key: 'cd1ft79ro8g833di',
      debug: 3
    };
  }

  getMedia() {
    navigator.getUserMedia({ audio: true, video: true }, (stream) => {
      this.handleSuccess(stream);
    }, (error) => {
      this.handleError(error);
    });
  }

  async init(userId: string, myEl: HTMLMediaElement, partnerEl: HTMLMediaElement) {
    this.myEl = myEl;
    this.partnerEl = partnerEl;
    try {
      this.getMedia();
    } catch (e) {
      this.handleError(e);
    }
    await this.createPeer(userId);
  }

  async createPeer(userId: string) {
    this.peer = new Peer(userId);
    this.peer.on('open', () => {
      this.wait();
    });
  }

  call(partnerId: string) {
    const call = this.peer.call(partnerId, this.myStream);
    call.on('stream', (stream) => {
      this.partnerEl.srcObject = stream;
    });
  }

  wait() {
    this.peer.on('call', (call) => {
      call.answer(this.myStream);
      call.on('stream', (stream) => {
        this.partnerEl.srcObject = stream;
      });
    });
  }

  handleSuccess(stream: MediaStream) {
    this.myStream = stream;
    this.myEl.srcObject = stream;
  }

  handleError(error: any) {
    if (error.name === 'ConstraintNotSatisfiedError') {
      const v = constraints.video;
     // this.errorMsg(`The resolution ${v.width.exact}x${v.height.exact} px is not supported by your device.`);
      this.errorMsg(`The resolution px is not supported by your device.`);
    } else if (error.name === 'PermissionDeniedError') {
      this.errorMsg('Permissions have not been granted to use your camera and ' +
        'microphone, you need to allow the page access to your devices in ' +
        'order for the demo to work.');
    }
    this.errorMsg(`getUserMedia error: ${error.name}`, error);
  }

  errorMsg(msg: string, error?: any) {
    const errorElement = document.querySelector('#errorMsg');
    errorElement.innerHTML += `<p>${msg}</p>`;
    if (typeof error !== 'undefined') {
      console.error(error);
    }
  }
}

init method will create a peer connection with yourId and then register wait method to listen to any call .
if any call receive inside wait method, it'll answer the call automatically,
you can handel it by yourself
(new peer() without option will connect to default server, you can use other server or run your own peer server)
it'll also start to stream video/audio as you define in option and push it to object of html element.(we have to create a html element to show video in home.html page)

call method will ask peer server to connect you to your partner as call type.
both call method and wait method duty is streaming partner video/audio and show it inside of partner media frame(we will create it inside home page)

Edit home.html

<ion-content>
  <div id="errorMsg"></div>

  <video id="partner-video" (click)="swapVideo('my-video')" autoplay playsinline
    [ngClass]="{'top-video': topVideoFrame === 'partner-video', 'main-video': topVideoFrame != 'partner-video'}">
  </video>
  <video id="my-video" (click)="swapVideo('partner-video')" autoplay playsinline
    [ngClass]="{'top-video': topVideoFrame === 'my-video', 'main-video': topVideoFrame != 'my-video'}" >
  </video>


  <ion-row nowrap>
    <ion-button (click)="init()">Login As: </ion-button>
    <ion-item>
      <ion-input type="text" [(ngModel)]="userId" placeholder="enter your nick name"></ion-input>
    </ion-item>
  </ion-row>

  <ion-row nowrap>
    <ion-button (click)="call()">Call To: </ion-button>
    <ion-item>
      <ion-input type="text" [(ngModel)]="partnerId" placeholder="your partner nick name"></ion-input>
    </ion-item>
  </ion-row>  
</ion-content>

video tag will show you stream media of you and your partner.
you have to login with nick name, because of using default server, you may see other people with easy nick name :D

Edit home.ts like this

import { WebrtcService } from '../providers/webrtc.service';

export class HomePage {
  topVideoFrame = 'partner-video';
  userId: string;
  partnerId: string;
  myEl: HTMLMediaElement;
  partnerEl: HTMLMediaElement;

  constructor(
    public webRTC: WebrtcService,
    public elRef: ElementRef
  ) {}

  init() {
    this.myEl = this.elRef.nativeElement.querySelector('#my-video');
    this.partnerEl = this.elRef.nativeElement.querySelector('#partner-video');
    this.webRTC.init(this.userId, this.myEl, this.partnerEl);
  }

  call() {
    this.webRTC.call(this.partnerId);
    this.swapVideo('my-video');
  }

  swapVideo(topVideo: string) {
    this.topVideoFrame = topVideo;
  }
}

login method will assign video frame to html element and pass them to webrtcservice, so the service can push stream to them.

call method will pass partnerId to webrtc service for connection to your partner.

Edit home.scss

.top-video{
    position: absolute;
    top: 100px;
    right: 100px;
    max-width: 100px;
    z-index: 2;
}

.main-video{
    width: 100%;
    max-height: 70%;
}

after you and your partner get connected, you can swap video with swapVideo method and [ngClass].

webrtc service will ask for camera/microphone permission.
because of that, when we run application outside of localhost, browser will block permission, so we have to run it with --ssl parameter.
first join your pc/laptop with your second device (pc/laptop or mobile) to the same network
then run ionic serve with your ip address, for example:

ionic serve --address 192.168.43.105 --ssl

in your second device visit that address with https prefix:

https://192.168.43.105:8100

source on github

That's it, i hope it's useful.

Posted on by:

Discussion

pic
Editor guide
 

Hi, thanks for this awesome tutorial, I could make a basic videocall app, but I am facing a problem, in my phone when I make it an app the camera does not work, I can see the camera and audio in the other device(my pc). Sometimes I get an error "getUserMedia error: NotReadableError". Ant idea what could be wrong? If I use my android device as a second device and I connect to the app throug LAN it works.
P.D. The sound gets returned from the speakers of the pc so it makes that awful sound if I am not wearing headphones. Is there a way to fix this too?

 

How to create room with peerjs so multi user can join that room

 

It will be helpful if you can share directives on how to make the app serve with ssl on (android) devices.

 

I used same address then running android + Conveyore (an extension) for visual studio
to solve cors issue on local host
try something like this: ionic cordova run android --address 192.168.43.105 --ssl

 

How do I end the call and close the video?

 

this.peer.close()

 

how can i implement a webrtc backend server?

 

Look at this repository
github.com/Shhzdmrz/SignalRCoreWebRTC
Good backend with signalr
And this:
dev.to/sebalr/video-call-with-webr...

You just need a signaling server
Each client should send his signal to other client
For doing this you need a server to swap client 's signal.
So used webrtc to create signal in both client and swap them with backend.
I used signalr and websocket
You can use any language and technic to swap signal between clients.

 

Are you available to provide a paid integration?

 

Would this work with a Firebase WebRTC or does it require a Peerjs server?

webrtc.org/getting-started/firebas...

 

i didn't touch firebase webrtc, but webrtc client's just need a signaling server to swap their signale(created in client side).
you can also use simple peer and a signaling server github.com/feross/simple-peer

 

you are not using the default speaker! Can you change the default speaker and camera?