Android Two-way Streaming

Example of Android application with player and streamer

This streamer can be used to publish WebRTC video stream and play any of the following types of streams on Web Call Server

• RTSP
• WebRTC
• RTMP

On the screenshot below the example is displayed when a stream is being published and another stream is being played.
Input fields

• WCS URL, where 192.168.2.104 is the address of the WCS server
• Publish Stream - for the name of published stream
• Play Stream - for the name of played stream

Two videos are played

• left - video from the camera
• right - the played video stream

Analyzing the example code

To analyze the code, let's take class StreamingMinActivity.java of the streaming-min example, which can be downloaded with corresponding build 1.0.1.38.

1. Initialization of the API

Flashphoner.init() code

For initialization, Сontext object is passed to the init() method.

Flashphoner.init(this);

2. Session creation

Flashphoner.createSession() code

SessionOptions object with the following parameters is passed to createSession() method:

• URL of WCS server
• SurfaceViewRenderer localRenderer, which will be used to display video from the camera
• SurfaceViewRenderer remoteRenderer, which will be used to play video stream

sessionOptions = new SessionOptions(mWcsUrlView.getText().toString());
sessionOptions.setLocalRenderer(localRender);
sessionOptions.setRemoteRenderer(remoteRender);

/**
  * Uncomment this code to use your own RTCConfiguration. For example, you can use custom TURN server
  */
//List<PeerConnection.IceServer> iceServers = new ArrayList<>();
//iceServers.add(new PeerConnection.IceServer("turn:your.turn-server.com:443?transport=tcp","username","passw0rd"));
//PeerConnection.RTCConfiguration customConfig = new PeerConnection.RTCConfiguration(iceServers);
//sessionOptions.setMediaOptions(customConfig);

/**
  * Session for connection to WCS server is created with method createSession().
  */
session = Flashphoner.createSession(sessionOptions);

3. Connection to the server

Session.connect() code

session.connect(new Connection());

4. Receiving the event confirming successful connection

Session.onConnected() code

@Override
public void onConnected(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mConnectButton.setText(R.string.action_disconnect);
            mConnectButton.setTag(R.string.action_disconnect);
            mConnectButton.setEnabled(true);
            mConnectStatus.setText(connection.getStatus());
            mPublishButton.setEnabled(true);
            mPlayButton.setEnabled(true);
        }
    });
}

5. Permissions request to publish video stream on Publish button pressing

ActivityCompat.requestPermissions() code

mPublishButton.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View view) {
        if (mPublishButton.getTag() == null || Integer.valueOf(R.string.action_publish).equals(mPublishButton.getTag())) {
            ActivityCompat.requestPermissions(StreamingMinActivity.this,
                  new String[]{Manifest.permission.RECORD_AUDIO, Manifest.permission.CAMERA},
                  PUBLISH_REQUEST_CODE);
            ...
        } else {
            ...
        }
        ...
    }
});

6. Video streaming when permissions are granted

Session.createStream(), Stream.publish() code

case PUBLISH_REQUEST_CODE: {
    if (grantResults.length == 0 ||
           grantResults[0] != PackageManager.PERMISSION_GRANTED ||
           grantResults[1] != PackageManager.PERMISSION_GRANTED) {
        Log.i(TAG, "Permission has been denied by user");
    } else {
        mPublishButton.setEnabled(false);
        /**
          * The options for the stream to publish are set.
          * The stream name is passed when StreamOptions object is created.
          */
        StreamOptions streamOptions = new StreamOptions(mPublishStreamView.getText().toString());

        /**
          * Uncomment this code to use case WebRTC-as-RTMP. Stream will be republished to your rtmpUrl
          */
        //streamOptions.setRtmpUrl("rtmp://192.168.1.100:1935/live2");

        /**
          * Stream is created with method Session.createStream().
          */
        publishStream = session.createStream(streamOptions);
        ...
        /**
          * Method Stream.publish() is called to publish stream.
          */
        publishStream.publish();

        Log.i(TAG, "Permission has been granted by user");
    }
}

7. Stream playback on Play button pressing

Session.createStream(), Stream.play() code

mPlayButton.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View view) {
        mPlayButton.setEnabled(false);
        if (mPlayButton.getTag() == null || Integer.valueOf(R.string.action_play).equals(mPlayButton.getTag())) {
            /**
              * The options for the stream to play are set.
              * The stream name is passed when StreamOptions object is created.
              */
            StreamOptions streamOptions = new StreamOptions(mPlayStreamView.getText().toString());

            /**
              * Stream is created with method Session.createStream().
              */
            playStream = session.createStream(streamOptions);
            ...
            /**
              * Method Stream.play() is called to start playback of the stream.
              */
            playStream.play();
            ...
        } else {
            ...
        }
        ...
    }
});

8. Stream playback stop on Stop button pressing

Stream.stop() code

playStream.stop();
playStream = null;

9. Streaming stop on Unpublish button pressing

Stream.stop() code

publishStream.stop();
publishStream = null;

10. Session disconnection.

Session.disconnect() code

mConnectButton.setEnabled(false);

/**
  * Connection to WCS server is closed with method Session.disconnect().
  */
session.disconnect();

11. Receiving the event confirming successful disconnection

Session.onDisconnection() code

@Override
public void onDisconnection(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mConnectButton.setText(R.string.action_connect);
            mConnectButton.setTag(R.string.action_connect);
            mConnectButton.setEnabled(true);
            mPublishButton.setText(R.string.action_publish);
            mPublishButton.setTag(R.string.action_publish);
            mPublishButton.setEnabled(false);
            mPlayButton.setText(R.string.action_play);
            mPlayButton.setTag(R.string.action_play);
            mPlayButton.setEnabled(false);
            mConnectStatus.setText(connection.getStatus());
            mPublishStatus.setText("");
            mPlayStatus.setText("");
        }
    });
}