react-native-webrtc

react-native-webrtc

A WebRTC module for React Native.

• Support iOS / macOS / Android.
• Support Video / Audio / Data Channels.

NOTE for Expo users: this plugin doesn't work unless you eject.

Community

Everyone is welcome to our Discourse community to discuss any React Native and WebRTC related topics.

WebRTC Revision

• Currently used revision: M87
• Supported architectures
  • Android: armeabi-v7a, arm64-v8a, x86, x86_64
  • iOS: arm64, x86_64 (for bitcode support, run this script)
  • macOS: x86_64

Installation

• iOS
• Android

Usage

Now, you can use WebRTC like in browser. In your index.ios.js/index.android.js, you can require WebRTC to import RTCPeerConnection, RTCSessionDescription, etc.

import {
  RTCPeerConnection,
  RTCIceCandidate,
  RTCSessionDescription,
  RTCView,
  MediaStream,
  MediaStreamTrack,
  mediaDevices,
  registerGlobals
} from 'react-native-webrtc';

Anything about using RTCPeerConnection, RTCSessionDescription and RTCIceCandidate is like browser. Support most WebRTC APIs, please see the Document.

const configuration = {"iceServers": [{"url": "stun:stun.l.google.com:19302"}]};
const pc = new RTCPeerConnection(configuration);

let isFront = true;
mediaDevices.enumerateDevices().then(sourceInfos => {
  console.log(sourceInfos);
  let videoSourceId;
  for (let i = 0; i < sourceInfos.length; i++) {
    const sourceInfo = sourceInfos[i];
    if(sourceInfo.kind == "videoinput" && sourceInfo.facing == (isFront ? "front" : "environment")) {
      videoSourceId = sourceInfo.deviceId;
    }
  }
  mediaDevices.getUserMedia({
    audio: true,
    video: {
      width: 640,
      height: 480,
      frameRate: 30
      facingMode: (isFront ? "user" : "environment"),
      deviceId: videoSourceId
    }
  })
  .then(stream => {
    // Got stream!
  })
  .catch(error => {
    // Log error
  });
});

pc.createOffer().then(desc => {
  pc.setLocalDescription(desc).then(() => {
    // Send pc.localDescription to peer
  });
});

pc.onicecandidate = function (event) {
  // send event.candidate to peer
};

// also support setRemoteDescription, createAnswer, addIceCandidate, onnegotiationneeded, oniceconnectionstatechange, onsignalingstatechange, onaddstream

RTCView

However, render video stream should be used by React way.

Rendering RTCView.

<RTCView streamURL={this.state.stream.toURL()}/>

Name	Type	Default	Description
mirror	boolean	false	Indicates whether the video specified by "streamURL" should be mirrored during rendering. Commonly, applications choose to mirror theuser-facing camera.
objectFit	string	'contain'	Can be contain or cover
streamURL	string	''	This is mandatory
zOrder	number	0	Similarly to zIndex

Custom APIs

registerGlobals()

By calling this method the JavaScript global namespace gets "polluted" with the following additions:

• navigator.mediaDevices.getUserMedia()
• navigator.mediaDevices.enumerateDevices()
• window.RTCPeerConnection
• window.RTCIceCandidate
• window.RTCSessionDescription
• window.MediaStream
• window.MediaStreamTrack

This is useful to make existing WebRTC JavaScript libraries (that expect those globals to exist) work with react-native-webrtc.

MediaStreamTrack.prototype._switchCamera()

This function allows to switch the front / back cameras in a video track on the fly, without the need for adding / removing tracks or renegotiating.

VideoTrack.enabled

Starting with version 1.67, when setting a local video track's enabled state to false, the camera will be closed, but the track will remain alive. Setting it back to true will re-enable the camera.

Related projects

The react-native-webrtc organization provides a number of packages which are useful when developing Real Time Communications applications.

Acknowledgements

Thanks to all contributors for helping with the project!

Special thanks to Wan Huang Yang for creating the first version of this package.