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QuickBlox provides a Multiparty Video Conferencing solution allowing to set up a video conference between 10-12 people. It is built on top of WebRTC SFU technologies. Features supported:
  • Video/Audio Conference with 10-12 people.
  • Join/Rejoin video room functionality (like Skype).
  • Mute/Unmute audio/video stream (own and opponents).
  • Display bitrate.
  • Switch video input device (camera).

​
Initialize

In order to start working with Multiparty Video Conferencing API, you need to initialize a conference endpoint. To request the conference server URL, please contact us:enterprise@quickblox.com. 
String conferenceServer = "your_conference_server";
ConferenceConfig.setUrl(conferenceServer);
ArgumentRequiredDescription
conferenceServeryesA conference server URL.

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Create session

Create a session using createSession() method. ConferenceClient instance is a client model responsible for managing the conference session. ConferenceClient has a setAutoSubscribeAfterJoin option signifying that your client will be subscribed to all online publishers after joining some room. By default, setAutoSubscribeAfterJoin is true. ConferenceSession is a session within a certain video room, managing all current processes. 
ConferenceClient client = ConferenceClient.getInstance(getApplicationContext());

QBRTCTypes.QBConferenceType conferenceType = isVideoCall
    ? QBRTCTypes.QBConferenceType.QB_CONFERENCE_TYPE_VIDEO
    : QBRTCTypes.QBConferenceType.QB_CONFERENCE_TYPE_AUDIO;

client.setAutoSubscribeAfterJoin(true);

client.createSession(userId, conferenceType, new ConferenceEntityCallback<ConferenceSession>() {
    @Override
    public void onSuccess(ConferenceSession conferenceSession) {
        // session Created Successfully
    }

    @Override
    public void onError(WsException exception) {
        // create Session Error
    }
});

​
Callbacks

To have the ability to receive callbacks about the current ConferenceSession instance state and conference events, you should implement appropriate interfaces. Implement the QBRTCSessionStateCallback for tracking connection state: 
QBRTCSessionStateCallback sessionStateCallback = new QBRTCSessionStateCallback<ConferenceSession>() {
    @Override
    public void onStateChanged(ConferenceSession conferenceSession, BaseSession.QBRTCSessionState sessionState) {

    }

    @Override
    public void onConnectedToUser(ConferenceSession conferenceSession, Integer userId) {

    }

    @Override
    public void onDisconnectedFromUser(ConferenceSession conferenceSession, Integer userId) {

    }

    @Override
    public void onConnectionClosedForUser(ConferenceSession conferenceSession, Integer userId) {

    }
};

currentConferenceSession.addSessionCallbacksListener(sessionStateCallback);
// or
currentConferenceSession.removeSessionCallbacksListener(sessionStateCallback);
Implement ConferenceSessionCallbacks for tracking conference events: 
ConferenceSessionCallbacks conferenceSessionCallbacks = new ConferenceSessionCallbacks() {
    @Override
    public void onPublishersReceived(ArrayList<Integer> publishersList) {
        // publisher or Publishers (users) joined
    }

    @Override
    public void onPublisherLeft(Integer userId) {
        // publisher left
    }

    @Override
    public void onMediaReceived(String type, boolean success) {
        // media received (audio or video type)
    }

    @Override
    public void onSlowLinkReceived(boolean uplink, int nacks) {
        // called when slowLink is received from server.
        // slowLink with uplink = true - several missing packets from server;
        // uplink = false means server is not receiving all your packets.
    }

    @Override
    public void onError(WsException exception) {
        // error from Server Received
    }

    @Override
    public void onSessionClosed(ConferenceSession conferenceSession) {
        // cession Closed
    }
};

currentConferenceSession.addConferenceSessionListener(conferenceSessionCallbacks);
// or
currentConferenceSession.removeConferenceSessionListener(conferenceSessionCallbacks);

​
Video and audio tracks

For obtaining video and audio tracks implement interface RTCClientVideoTracksCallbacks and RTCClientAudioTracksCallback. 
QBRTCClientVideoTracksCallbacks videoTracksCallbacks = new QBRTCClientVideoTracksCallbacks<ConferenceSession>() {
    @Override
    public void onLocalVideoTrackReceive(ConferenceSession conferenceSession, QBRTCVideoTrack videoTrack) {

    }

    @Override
    public void onRemoteVideoTrackReceive(ConferenceSession conferenceSession, QBRTCVideoTrack videoTrack, Integer userId) {

    }
};

// add callback
currentConferenceSession.addVideoTrackCallbacksListener(videoTracksCallbacks);
// or remove
currentConferenceSession.removeVideoTrackCallbacksListener(videoTracksCallbacks);

QBRTCClientAudioTracksCallback audioTracksCallback = new QBRTCClientAudioTracksCallback<ConferenceSession>() {
    @Override
    public void onLocalAudioTrackReceive(ConferenceSession conferenceSession, QBRTCAudioTrack audioTrack) {

    }

    @Override
    public void onRemoteAudioTrackReceive(ConferenceSession conferenceSession, QBRTCAudioTrack audioTrack, Integer userId) {

    }
};

// add callback
currentConferenceSession.addAudioTrackCallbacksListener(audioTracksCallback);
// or remove
currentConferenceSession.removeAudioTrackCallbacksListener(audioTracksCallback);
To render the video track, use the QBConferenceSurfaceView as renderer: 
QBConferenceSurfaceView videoView = findViewById(R.id.opponentView);

videoTrack.removeRenderer(videoTrack.getRenderer());
videoTrack.addRenderer(videoView);

​
Join video room

You can join a room as a listener or as a publisher. As a listener, you subscribe only to the publishers, without giving your own video and audio streams. 
boolean asPublisher = true;
int userId = currentConferenceSession.getCurrentUserID();

QBConferenceRole conferenceRole = asPublisher ? QBConferenceRole.PUBLISHER : QBConferenceRole.LISTENER;

currentConferenceSession.joinDialog(dialogId, conferenceRole, new ConferenceEntityCallback<ArrayList<Integer>>() {
    @Override
    public void onSuccess(ArrayList<Integer> publishers) {

    }

    @Override
    public void onError(WsException exception) {

    }
});
To subscribe to the active publisher, you should use the snippet below: 
Set<Integer> publishersSet = currentConferenceSession.getActivePublishers();
for (Integer publisher : publishersSet) {
    currentConferenceSession.subscribeToPublisher(publisher);
}
You should subscribe to publishers only when the session state becomes connected. Use onStateChanged() callback method to track session states.
If you are subscribing as a listener, then you can subscribe to publishers right after the successful joinDialog(). To unsubscribe from the publisher, use the unSubscribeFromPublisher() method. 
currentConferenceSession.unsubscribeFromPublisher(publisher);

​
Mute local audio

Mute the audio by calling getLocalAudioTrack().setEnabled() method. Using this method, we can tell SDK to send/not send audio data from a local peer in the specified WebRTC session. 
currentConferenceSession.getMediaStreamManager().getLocalAudioTrack().setEnabled(isAudioEnabled);

​
Mute remote audio

You can always get remote audio tracks for a specific user ID in the call using the above-specified QBRTCSession methods (assuming that they are existent). You can also mute remote media tracks on your side by changing the value of the enabled property for a specific remote media track. 
boolean isAudioEnabled = false;

currentConferenceSession.getMediaStreamManager().getAudioTrack(opponentId).setEnabled(isAudioEnabled);

​
Disable local video

Turn off the video by calling getLocalVideoTrack().setEnabled(). Using this method, we can tell SDK not to send video data from a local peer in the specified session. 
currentConferenceSession.getMediaStreamManager().getLocalVideoTrack().setEnabled(isVideoEnabled);

​
Disable remote video

Turn off the video by calling getVideoTrack(opponentID).setEnabled(). Using this method, we can tell SDK not to send video data from a remote peer in the specified session. 
boolean isVideoEnabled = false;

currentConferenceSession.getMediaStreamManager().getVideoTrack(opponentId).setEnabled(isVideoEnabled);

​
Leave video room

To leave the current joined video room, use the leave() method. 
currentConferenceSession.leave();

​
Camera resolution

The camera resolution is a video stream encoding parameter. It’s possible to set the custom video resolution to provide guarantees for the predictable behavior of the video stream. 
int videoWidth = QBRTCMediaConfig.VideoQuality.QBGA_VIDEO.width;
int videoHeight = QBRTCMediaConfig.VideoQuality.QBGA_VIDEO.height;

// VGA Resolution
//videoWidth = QBRTCMediaConfig.VideoQuality.VGA_VIDEO.width;
//videoHeight = QBRTCMediaConfig.VideoQuality.VGA_VIDEO.height;

// HD Resolution
//videoWidth = QBRTCMediaConfig.VideoQuality.HD_VIDEO.width;
//videoHeight = QBRTCMediaConfig.VideoQuality.HD_VIDEO.height;

// custom Resolution (for example FullHD)
//videoWidth = 1920;
//videoHeight = 1080;

QBRTCMediaConfig.setVideoWidth(videoWidth);
QBRTCMediaConfig.setVideoHeight(videoHeight);