Example v4l4j

VideoCaptureApp.java

package net.gustavohenrique;

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.JLabel;
import javax.swing.SwingUtilities;

import au.edu.jcu.v4l4j.CaptureCallback;
import au.edu.jcu.v4l4j.FrameGrabber;
import au.edu.jcu.v4l4j.V4L4JConstants;
import au.edu.jcu.v4l4j.VideoDevice;
import au.edu.jcu.v4l4j.VideoFrame;
import au.edu.jcu.v4l4j.exceptions.StateException;
import au.edu.jcu.v4l4j.exceptions.V4L4JException;

public class VideoCaptureApp extends WindowAdapter implements CaptureCallback {
	private static int width = 640, height = 480, std = V4L4JConstants.STANDARD_WEBCAM, channel = 0;
	private static String device = "/dev/video0";
	private VideoDevice videoDevice;
	private FrameGrabber frameGrabber;
	private JLabel label;
	private JFrame frame;

	public static void main(String args[]) {

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

	public VideoCaptureApp() {
		try {
			initFrameGrabber();
		} catch (V4L4JException e1) {
			System.err.println("Error setting up capture");
			e1.printStackTrace();

			// cleanup and exit
			cleanupCapture();
			return;
		}

		// create and initialise UI
		initGUI();

		// start capture
		try {
			frameGrabber.startCapture();
		}
		catch (V4L4JException e) {
			System.err.println("Error starting the capture");
			e.printStackTrace();
		}
	}

	private void initFrameGrabber() throws V4L4JException {
		videoDevice = new VideoDevice(device);
		frameGrabber = videoDevice.getJPEGFrameGrabber(width, height, channel, std, 80);
		frameGrabber.setCaptureCallback(this);
		width = frameGrabber.getWidth();
		height = frameGrabber.getHeight();
		System.out.println("Starting capture at " + width + "x" + height);
	}

	private void initGUI() {
		frame = new JFrame();
		label = new JLabel();
		
		JButton button = new JButton("Capture");
		button.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				
			}
        });
		
		frame.getContentPane().add(label);
		frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		frame.addWindowListener(this);
		frame.setVisible(true);
		frame.setSize(width, height);
	}

	private void cleanupCapture() {
		try {
			frameGrabber.stopCapture();
		}
		catch (StateException ex) {
			// the frame grabber may be already stopped, so we just ignore
			// any exception and simply continue.
		}

		// release the frame grabber and video device
		videoDevice.releaseFrameGrabber();
		videoDevice.release();
	}

	public void windowClosing(WindowEvent e) {
		cleanupCapture();
		frame.dispose();
		System.out.println("exiting!!!");
	}

	@Override
	public void exceptionReceived(V4L4JException e) {
		// This method is called by v4l4j if an exception
		// occurs while waiting for a new frame to be ready.
		// The exception is available through e.getCause()
		e.printStackTrace();
	}

	@Override
	public void nextFrame(VideoFrame frame) {
		// This method is called when a new frame is ready.
		// Don't forget to recycle it when done dealing with the frame.

		// draw the new frame onto the JLabel
		label.getGraphics().drawImage(frame.getBufferedImage(), 0, 0, width, height, null);

		// recycle the frame
		frame.recycle();
	}
}

/*
download:
svn co http://v4l4j.googlecode.com/svn/v4l4j/trunk v4l4j

compiling:
ant clean all
sudo ant install

dependencies:
ant
make
gcc
libjpeg-dev
java-1.6.0-openjdk-devel
libgcj-devel
*/