Android Streamer¶

Example of streamer for Android¶

This streamer can be used to publish WebRTC video stream on Web Call Server.

On the screenshot below the example is displayed when a stream is being published.

In the URL specified in the input field

192.168.2.104 is the address of the WCS server
test is the stream name

Two videos are played

left - video from the camera
right - the published video stream as received from the server

Analyzing the example code¶

To analyze the code, let's take class StreamerActivity.java of the streamer 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 the 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 the published video stream

SessionOptions sessionOptions = new SessionOptions(url);
sessionOptions.setLocalRenderer(localRender);
sessionOptions.setRemoteRenderer(remoteRender);

/**
  * 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() {
           mStartButton.setText(R.string.action_stop);
           mStartButton.setTag(R.string.action_stop);
           mStartButton.setEnabled(true);
           mStatusView.setText(connection.getStatus());

           /**
             * The options for the stream to publish are set.
             * The stream name is passed when StreamOptions object is created.
             */
           StreamOptions streamOptions = new StreamOptions(streamName);

           /**
             * Stream is created with method Session.createStream().
             */
           publishStream = session.createStream(streamOptions);
           ...
       }
   });
}

5. Video stream creation¶

Session.createStream(), ActivityCompat.requestPermissions() code

StreamOptions object with name of the stream is passed to the createStream() method.

StreamOptions streamOptions = new StreamOptions(streamName);

/**
  * Stream is created with method Session.createStream().
  */
publishStream = session.createStream(streamOptions);
...
ActivityCompat.requestPermissions(StreamerActivity.this,
       new String[]{Manifest.permission.RECORD_AUDIO, Manifest.permission.CAMERA},
       PUBLISH_REQUEST_CODE);

6. Video stream publishing¶

Stream.publish() code

case PUBLISH_REQUEST_CODE: {
    if (grantResults.length == 0 ||
           grantResults[0] != PackageManager.PERMISSION_GRANTED ||
           grantResults[1] != PackageManager.PERMISSION_GRANTED) {
        mStartButton.setEnabled(false);
        session.disconnect();
        Log.i(TAG, "Permission has been denied by user");
    } else {
        /**
          * Method Stream.publish() is called to publish stream.
          */
        publishStream.publish();
        Log.i(TAG, "Permission has been granted by user");
    }
}

7. Receiving the event confirming successful stream publishing¶

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

On receiving this event preview stream is created with Session.createStream() and Stream.play() is invoked to play it.

publishStream.on(new StreamStatusEvent() {
    @Override
    public void onStreamStatus(final Stream stream, final StreamStatus streamStatus) {
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                if (StreamStatus.PUBLISHING.equals(streamStatus)) {

                    /**
                      * The options for the stream to play are set.
                      * The stream name is passed when StreamOptions object is created.
                      */
                    StreamOptions streamOptions = new StreamOptions(streamName);

                    /**
                      * 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 {
                    Log.e(TAG, "Can not publish stream " + stream.getName() + " " + streamStatus);
                }
                mStatusView.setText(streamStatus.toString());
            }
        });
    }
});

8. Session disconnection¶

Session.disconnect() code

mStartButton.setEnabled(false);

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

9. Receiving the event confirming successful disconnection¶

Session.onDisconnection() code

@Override
public void onDisconnection(final Connection connection) {
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            mStartButton.setText(R.string.action_start);
            mStartButton.setTag(R.string.action_start);
            mStartButton.setEnabled(true);
            mStatusView.setText(connection.getStatus());
        }
    });
}