Getting Started

This guide explains how to create a basic audio video conference application for mobile with React Native. It starts with importing the Dolby.io Communications SDK for React Native and guides you through the steps to launch a conference call.

Prerequisites

Make sure that you have:

  • A Dolby.io account
  • An iOS or Android device to run the application on, or the device emulator
  • React Native 0.66+ (including Expo projects)
  • Java 11 (for Android development)

For reference, see the GitHub sample repository.

Please review Supported Environments for more information on iOS and Android requirements.

Create a new project

1. Create a new React Native project:

npx react-native init DolbyIoGettingStarted

It will take a minute or two to download the template and install the different components needed for the project to run.

2. Once the project is created, go to the newly created folder:

cd DolbyIoGettingStarted

Installation

1. Install the Dolby.io Communications SDK for React Native using npm or yarn:

npm install @dolbyio/comms-sdk-react-native --save
yarn add @dolbyio/comms-sdk-react-native

2. Complete the installation:

For iOS, install native dependencies via CocoaPods:

pod install --repo-update --project-directory=ios/

For Android, add the following lines to your android/build.gradle file, in the allprojects, repositories section:

maven { url 'https://android-sdk.voxeet.com/release' }

and also add following lines to your android/app/build.gradle file, in the android section:

packagingOptions {
    pickFirst '**/armeabi-v7a/libc++_shared.so'
    pickFirst '**/x86/libc++_shared.so'
    pickFirst '**/arm64-v8a/libc++_shared.so'
    pickFirst '**/x86_64/libc++_shared.so'
}

Getting started

Replace the content of your App.js with the following:

import React, { useEffect, useState } from 'react';
import {
    SafeAreaView,
    ScrollView,
    StatusBar,
    StyleSheet,
    Text,
    useColorScheme,
    View,
    Button,
    TextInput,
    Platform,
    PermissionsAndroid,
} from 'react-native';

import {
    Colors,
} from 'react-native/Libraries/NewAppScreen';


const Section = ({children, title}) => {
    const isDarkMode = useColorScheme() === 'dark';
    return (
        <View style={styles.sectionContainer}>
          <Text
              style={[
                  styles.sectionTitle,
                  {
                      color: isDarkMode ? Colors.white : Colors.black,
                  },
              ]}>
              {title}
          </Text>
          <Text
              style={[
                  styles.sectionDescription,
                  {
                      color: isDarkMode ? Colors.light : Colors.dark,
                  },
              ]}>
              {children}
          </Text>
        </View>
    );
};

const App = () => {
    const [conferenceAlias, setConferenceAlias] = useState("react-native");
    const [streamingUsers, setStreamingUsers] = useState([]);

    const joinConference = async () => {
    };

    const isDarkMode = useColorScheme() === 'dark';

    const backgroundStyle = {
        backgroundColor: isDarkMode ? Colors.darker : Colors.lighter,
    };

    return (
        <SafeAreaView style={backgroundStyle}>
            <StatusBar barStyle={isDarkMode ? 'light-content' : 'dark-content'} />
            <ScrollView
                contentInsetAdjustmentBehavior="automatic"
                style={backgroundStyle}>
                <View
                    style={{
                        backgroundColor: isDarkMode ? Colors.black : Colors.white,
                    }}>
                    <Section title="Conference">
                        <Text>Alias:</Text>
                        <TextInput
                            style={styles.textInput}
                            onChangeText={setConferenceAlias}
                            value={conferenceAlias} />
                        <Button onPress={joinConference} title="Join the conference" />
                    </Section>

                    <Section title="Videos" style={{backgroundColor: 'black'}}>
                        {streamingUsers.map(({ participant, stream }) => (
                            <VideoView
                                key={`video-${participant.id}`}
                                style={{height: 200, width: 180, borderWidth: 1}}
                                ref={async element => {
                                    try {
                                        await element.attach(participant, stream);
                                    } catch (error) {
                                        console.error(error);
                                    }
                                }}
                            />
                        ))}
                    </Section>
                </View>
            </ScrollView>
        </SafeAreaView>
    );
};

const styles = StyleSheet.create({
    sectionContainer: {
        marginTop: 32,
        paddingHorizontal: 24,
    },
    sectionTitle: {
        fontSize: 24,
        fontWeight: '600',
    },
    sectionDescription: {
        marginTop: 8,
        fontSize: 18,
        fontWeight: '400',
    },
    textInput: {
        height: Platform.OS == 'android' ? 40 : 20,
        margin: 12,
        borderWidth: 1,
        padding: 10,
        lineHeight: 14,
    },
});

export default App;

Permissions

For iOS, establish privacy permissions by adding two new keys in Info.plist:

  • Privacy - Microphone Usage Description
  • Privacy - Camera Usage Description

For Android, the application must request permissions to access the microphone and camera. When the application component loads, we will request the permissions. In the const App = () => { }; add the following code:

const requestPermissions = async () => {
    try {
        const cameraGranted = await PermissionsAndroid.request(
            PermissionsAndroid.PERMISSIONS.CAMERA,
            {
                title: "Camera Permission",
                message:"This App needs access to your camera",
                buttonNeutral: "Ask Me Later",
                buttonNegative: "Cancel",
                buttonPositive: "OK"
            }
        );

        if (cameraGranted === PermissionsAndroid.RESULTS.GRANTED) {
            console.log("You can use the camera");
        } else {
            console.log("Camera permission denied");
        }

        const micGranted = await PermissionsAndroid.request(
            PermissionsAndroid.PERMISSIONS.RECORD_AUDIO,
            {
                title: "Microphone Permission",
                message: "This App needs access to your microphone so you can talk to people.",
                buttonNeutral: "Ask Me Later",
                buttonNegative: "Cancel",
                buttonPositive: "OK"
            }
        );

        if (micGranted === PermissionsAndroid.RESULTS.GRANTED) {
            console.log("You can use the microphone");
        } else {
            console.log("Camera permission denied");
        }
    } catch (error) {
        console.warn(error);
    }
};

useEffect(() => {
    async function initialize() {
        if (Platform.OS === 'android') {
            // Request the permissions to access the camera and the microphone
            // required for Android only
            await requestPermissions();
        }

        // Initialization of the SDK...
    }

    initialize();
}, []);

Initialization

1. Import the SDK to the application by adding the following line at the top of the App.js file:

import CommsAPI, { VideoView } from '@dolbyio/comms-sdk-react-native';

2. Initialize the SDK using the secure authentication method that uses a token in the application. For more information, see the Initializing the SDK document. For the purpose of this example, we are using a client access token generated from the Dolby.io dashboard. Insert the following code after requesting the permissions for the microphone and camera (look for // Initialization of the SDK...):

// Generate a client access token from the Dolby.io dashboard and insert into access_token variable;
let access_token = 'ClientAccessToken';
await CommsAPI.initializeToken(access_token, () => {
    return new Promise((resolve, reject) => {
        resolve(access_token);
    });
});

3. Add the following code after the SDK initialization to automatically open a session after initializing the SDK. The session will open with a random user name.

const rand = Math.round(Math.random() * 10000);
await CommsAPI.session.open({ name: `user-${rand}` });

Create and join a conference

Locate the function joinConference in the code and replace it with the following to add a button to create and join a conference:

const joinConference = async () => {
    try {
        const conferenceOptions = {
            alias: conferenceAlias,
            params: {},
        };

        // Create the conference
        const conference = await CommsAPI.conference.create(conferenceOptions);
        console.log(`Conference ${conference.id} created`);

        const joinOptions = {
            constraints: {
                audio: true,
                video: true,
            }
        };

        // Join the conference with Audio and Video on
        await CommsAPI.conference.join(conference, joinOptions);
        console.log('Conference joined');
    } catch (error) {
        console.error(error);
    }
};

Integrate video

Use the onStreamsChange event handler provided by the conference object of the SDK to integrate video into your application. This event is triggered when a participant video stream changes, for example, a new video stream coming in or the video is stopped. Add the following code to create VideoView objects and insert them into the videoElements dictionary. The videoElements dictionary is used to generate the UI within the function getVideoElements.

Insert the following code in your App component:

useEffect(() => {
    const unsubscribe = CommsAPI.conference.onStreamsChange((data, type) => {
        if (type === 'EVENT_CONFERENCE_STREAM_REMOVED') {
            // Remove the users without a video stream
            setStreamingUsers(usr => usr.filter(d => d.participant.id !== data.participant.id));
            return;
        }

        if (
            !streamingUsers
            .map(d => d.participant.id)
            .includes(data.participant.id) &&
            data?.stream?.videoTracks?.length > 0
        ) {
            setStreamingUsers(sp => [...sp, data]);
        }
    });

    return () => unsubscribe();
}, []);

Run the application

On iOS, run the application:

npx react-native run-ios

On Android, run the application:

npx react-native run-android

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