ScreenRecorder.java

/*
 * This file is part of VLCJ.
 *
 * VLCJ is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * VLCJ is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with VLCJ.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2009-2016 Caprica Software Limited.
 */

package uk.co.caprica.vlcj.test.screen;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

import uk.co.caprica.vlcj.player.MediaPlayer;
import uk.co.caprica.vlcj.player.MediaPlayerFactory;
import uk.co.caprica.vlcj.test.VlcjTest;

/**
 * A simple screen recorder.
 */
public class ScreenRecorder extends VlcjTest {

    private static final String[] OPTIONS = {
        "--quiet",
        "--quiet-synchro",
        "--intf",
        "dummy"
    };

    private static final String MRL     = "screen://";
    private static final String SOUT    = ":sout=#transcode{vcodec=FLV1,vb=%d,scale=%f}:duplicate{dst=file{dst=%s}}";
    private static final String FPS     = ":screen-fps=%d";
    private static final String CACHING = ":screen-caching=%d";

    private static final int    fps     = 20;
    private static final int    caching = 500;
    private static final int    bits    = 4096;
    private static final float  scale   = 0.5f;

    private final MediaPlayerFactory mediaPlayerFactory;
    private final MediaPlayer mediaPlayer;

    private final JFrame frame;

    public static void main(String[] args) {
        if(args.length != 1) {
            System.err.println("Specify a destination file");
            System.exit(1);
        }

        final String destination = args[0];

        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new ScreenRecorder(destination);
            }
        });
    }

    public ScreenRecorder(final String destination) {
        mediaPlayerFactory = new MediaPlayerFactory(OPTIONS);
        mediaPlayer = mediaPlayerFactory.newHeadlessMediaPlayer();
        JPanel cp = new JPanel();
        JButton recordButton = new JButton("Record");
        cp.add(recordButton);
        frame = new JFrame("vlcj");
        frame.setContentPane(cp);
        frame.setLocation(10, 10);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                stop();
            }
        });
        recordButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                go(destination);
            }
        });
        frame.setVisible(true);
    }

    private void go(String destination) {
        frame.setState(JFrame.ICONIFIED);
        mediaPlayer.playMedia(MRL, getMediaOptions(destination));
    }

    private void stop() {
        mediaPlayer.stop();
        mediaPlayer.release();
        mediaPlayerFactory.release();
    }

    private String[] getMediaOptions(String destination) {
        return new String[] {
            String.format(SOUT, bits, scale, destination),
            String.format(FPS, fps),
            String.format(CACHING, caching)
        };
    }
}