iOS Swift/Objective-c adapter

Overview

Follow this step-by-step tutorial to implement the Watch Together video chat sample application.

While the client-side application will take care of most of the functionality, in order to make this sample application work, you will need to get an access token from the Cluster Authentication Server (CAS).

To better understand the Watch Together architecture have a look at this guide - Watch Together overview
Have a look at the Authentication overview
The full code samples can be found here
- Swift
- Obj-c adapter

Requirements

To complete this guide successfully the following prerequisites are required:

A Sceenic account
Xcode

Authentication

An Access Token is needed in order to allow a client to connect to a Session.

Note: It is important that the client application does not request an Access Token directly from the backend. By doing that you risk exposing the API_TOKEN and API_SECRET.

To learn how to acquire an Access Token please look at the Cluster Authentication Server (CAS) reference
To simplify the tutorial, in the section below you can see an example of getting an Access Token

Acquiring an Access Token

curl -iL --request GET --url https://YOUR_CAS_URL/stream/token/v2/ --header 'auth-api-key: API_KEY' --header 'auth-api-secret: API_SECRET'

TheAccess Tokenis a JWT token - more about JWT you can read - here.

A successful response will look like that:

{
    "token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9...."
}

You can get your API_KEY and API_SECRET in your private area, here.

Note: Every Streaming Token corresponds to one specific Session only. To allow two different clients to connect to the same Session, the clients need to use the same Access Token.

Going to production

‌To go to production you will need to implement your own authentication server. Using the server the Access Token will be shared to your various clients (Web, Android, and iOS). With this valid Access Token you will be able to use the service.

For that you will need:

API_KEY, and API_SECRET - can be retrieved in your private area once you login
Your own working authentication server - Authentication overview

Creating a new project

Open Xcode and create a new project
Choose a Single View application
Configure your product organization, bundle, and team names
Set the application location on your computer and press "create"

Adding Watch Together iOS SDK library to the project

In case you require to use an Objective-c project, please add the WatchTogetherAdapter to your project

Download the library (Private area) package and unpack it
Create a folder with the name "WatchTogether" in the root of the project
Copy all files ("WatchTogether.framework","WatchTogether.podspec") to created folder
[When using the Objective-c adapater] - do the following extra steps
- Create a folder named "WatchTogetherAdapter" in the root of the project
- Copy all the files unpacked from the SDK ("WatchTogetherAdapter.framework","WatchTogetherAdapter.podspec") to "WatchTogetherAdapter" folder
Open folder with your project in Terminal
- Print the command "pod init"
- Print the command "open Podfile"
- In the opened file paste this string pod 'WatchTogether', :path => './WatchTogether' after "target 'Your project name' do" and save file
- [When using the Objective-c adapater] - do the following extra steps
  - In the opened file paste the following strings pod 'WatchTogetherAdapter', :path => './WatchTogetherAdapter' pod 'WatchTogether', :path => './WatchTogether'
- In the terminal write the command "pod install"
- To get more information about Cocoapod go to this site https://cocoapods.org
Disable application Bitcode.
- Build Settings → Build Options → Enable Bitcodes → Set to "NO"
To mock a video for the simulator you will need to add an mp4 video file to your main bundle and rename it to simulator_mock.mp4

Granting access to camera and microphone

Go to the info.plist file, add the following properties
- Add the property "Privacy - Camera Usage Description" and the value "$(PRODUCT_NAME) uses the camera"
- Add the property "Privacy - Microphone Usage Description" and the value "$(PRODUCT_NAME) uses the microphone"

Initialize a Session

Import the library to the view controller

import WatchTogether

Set the minimal log level

Session.setMinLogLevel(.debug)

Create a session instance
- username - a display name
- delegate - an object conforming to SessionDelegate protocol

let session = SessionBuilder()
            .withUsername(username)
            .withVideoCodec(.H264)
            .withVideoRenderer(.Metal)
            .withDelegate(self)
            .build()

Get the local participant instance

let localParticipant = session.localParticipant

Connect to the session
- Access token - an authentication token received from the Authentication Server

do {
    try session.connect(with: token)// method can throw
} catch {
    print(error)//error is WTError
    //fallback logic
}

Disconnect from the session

session.disconnect()

Using the SessionDelegate

extension YourClass: SessionDelegate {
    func onSessionConnected(sessionId: String, participants: [Participant]) {
        print("Connected to \(sessionId)")
    }
    
    func onSessionDisconnect() {
        print("Disconnect from session")
    }
    
    func onRemoteParticipantJoined(participant: Participant) {
        print("New participant with id: \(participant.getId())")
    }
     
    func onRemoteParticipantStartMedia(participant: Participant) {
        print("New media from id: \(participant.getId())")
    }
    
    func onRemoteParticipantStopMedia(participant: Participant) {
        print("Stoped media from id: \(participant.getId())")
    }
    
    func onRemoteParticipantLeft(participant: Participant) {
        print("Participant left with id: \(participant.getId())")
    }
    
    func onSessionError(error: Error) {
        print(error.localizedDescription)
    } 
    
    func onRemoteParticipantNotification(message: String, participantId: String) {
        print("message: \(message) from participant \(participantId)"
    }
}

- (void)onSessionConnectedWithSessionId:(NSString *)sessionId participants:(NSArray<ParticipantAdapter *> *)participants{
    NSLog(@"Connected to session");
}

- (void)onSessionDisconnect{
    NSLog(@"Disconnect from session");
}

- (void)onRemoteParticipantJoinedWithParticipant:(ParticipantAdapter *)participant{
    NSLog(@"New participant");
}

- (void)onRemoteParticipantStartMediaWithParticipant:(ParticipantAdapter *)participant{
    NSLog(@"New media");
}

- (void)onRemoteParticipantStopMediaWithParticipant:(ParticipantAdapter *)participant{
    NSLog(@"Stoped media");
}

- (void)onRemoteParticipantLeftWithParticipant:(ParticipantAdapter *)participant{
    NSLog(@"Participant left");
}

- (void)onSessionErrorWithError:(NSError *)error{
    NSLog(@"Session failed with error");
}

-(void)onRemoteParticipantNotificationWithMessage:(NSString *)message participantId:(NSString *)participantId { 
    NSLog(@"message: %@ from participant %@", message, participantId);
}

Using the Participant object

To get Participant video use the method getVideo()
To get Participant display name use the method getDisplayName()
To get Participant id use the method getId()

class ParticipantView: UIView {
    var participant: Participant?
    
     func setParticipant(_ participant: Participant) {
        self.participant = participant
        let participantVideo = participant.getVideo() // View with video from participant
        let displayName = participant.getDisplayName() // Participant  display name
        participant?.delegate = self
        let participantId:String = participant.getId()// Participant id

        self.addSubview(participantVideo)
     }
     //MARK: Actions to change participant properties
     @IBAction func onVolumeChanged(_ sender: UISlider) {
        participant.volume = sender.value// values from 0.0 to 1.0
     }
     @IBAction func muteAudioAction(_ sender: UIButton) {
        participant.isAudioEnabled = !participant.isAudioEnabled //true/false enable disable audio
     }
    
     @IBAction func muteVideoAction(_ sender: UIButton) {
        participant.isVideoEnabled = !participant.isVideoEnabled //true/false
     }
}

@property (weak, nonatomic) ParticipantAdapter* participant;

- (void) setParticipant: (ParticipantAdapter *)participant {
    UIView* view = [participant getVideo];
    NSString *participantId = [_participant getId]
    _participantNameLabel.text = [_participant getDisplayName];
    _participant.delegate = self
    [self addSubview: view];
 } 
 //MARK: Actions in participant view
 - (IBAction)changeVolume:(UISlider *)sender {
    _participant.volume = sender.value; //from 0.0 to 1.10
}
 - (IBAction)enableAudio:(UIButton *)sender {
    _participant.isAudioEnabled = !_participant.isAudioEnabled//YES/NO turn on/off
 }
 - (IBAction)enableAudio:(UIButton *)sender {
    !_participant.isVideoEnabled = !_participant.isVideoEnabled
 }

Using the ParticipantDelegate object

extension ParticipantView: ParticipantDelegate{
    func onReconnecting() {
        print("Participant reconnecting")
    }
    
    func onReconnected() {
        print("Participant reconnected")
    }
    
    func onChangeMediaSettings() {
        print("Participant has changed media settings")
    }
    
    func onStreamUpdate(qualityInfo: StreamQualityInfo) {
        print("Participant has new quality info \(qualityInfo.quality)")
    }
}

- (void)onChangeMediaSettings{
    NSLog(@"On participant cahnge media settings");
}

- (void)onStreamUpdateWithQualityInfo:(StreamQualityInfoAdapter *)qualityInfo{
    NSLog(@"On participant update quality");
}

- (void)onReconnecting{
    NSLog(@"On participant reconnecting");
}

- (void)onReconnected{
    NSLog(@"On participant reconnected");
}

Working with the LocalParticipant object

LocalParticipant class implements the Participant protocol

Camera preview

localParticipant.startCameraPreview()

//MARK: switch camera action
@IBAction func onSwitchCamera(_ sender: UIButton) {
    localParticipant.cameraPosition == .front ? AVCaptureDevice.Position.back
            : AVCaptureDevice.Position.front
}
func onResolutionChanged(to: VideoQuality, fps: Int32) {
    localParticipant.videoQuality = VideoQuality.Low// VideoQuality.Hight, VideoQuality.Default
    localParticipant.fps = fps // normal values in range from 15 to 45
}

[_localParticipant startCameraPreview];

//MARK: Actions
//@property (nonatomic) BOOL isFront;
- (IBAction)switchCamera:(id)sender {
    _isFront = !_isFront;
    if (_isFront){
        [_localParticipant setCameraPosition: AVCaptureDevicePositionFront];
    } else {
        [_localParticipant setCameraPosition: AVCaptureDevicePositionBack];
    }
}
- (IBAction)changeVideoQuality:(UISegmentedControl *)sender {
        if(sender.selectedSegmentIndex == 0){
            _localParticipant.videoQuality = VideoQualityAdapterLow;
        } else if (sender.selectedSegmentIndex == 1){
            _localParticipant.videoQuality = VideoQualityAdapterDefault;
        } else {
            _localParticipant.videoQuality = VideoQualityAdapterHigh;
        }
    }
}

- (IBAction)changeFrameRate:(UISlider *)sender {
        _localParticipant.frameRate = sender.value; //normal values in range 15 to 45
    }
}

Video orientation set method using the AVCaptureVideoOrientation parameter

localParticipant.set(orientation: .landscapeRight) 
// localParticipant.set(orientation: nil) //use to disable orientation lock

Running the application

Once coding is finished, you should be able to run the application.

You can view the complete Watch Together sample application here - Swift.

Next steps

Learn more about Watch Together architecture - Watch Together overview
To understand better how to set up the Authentication please have a look at the Authentication overview.

Support

Need technical support? contact us at [email protected].

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Last updated 3 years ago

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