Re: JMF - Webcam settings - Resolution, Gain, Brightness, Contrast

Thanks again for your suggestion - after much playing with the code, I
finally managed to get it to do what I wanted. I have posted it here
in case it is of use to anyone else.

The key part was labeled below - although it is fancier to give the
user the option of the settings for the camera, I decided to hard-code
it in for my specific use.

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.media.*;
import javax.media.control.*;
import javax.media.format.*;
import javax.media.util.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.media.datasink.*;
import javax.media.protocol.*;
import java.awt.event.*;
import com.sun.image.codec.jpeg.*;

class FrameGrab
{
    public static void main(String[] args) throws Exception
    {
        boolean saved;
        CaptureDeviceInfo webCamDeviceInfo = null;
        MediaLocator ml = null;
        Dimension imageSize = null;
        FormatControl formatControl = null;
        VideoFormat currentFormat = null;
        Format[] videoFormats = null;

        // Create capture device
        CaptureDeviceInfo deviceInfo =
CaptureDeviceManager.getDevice("vfw:Microsoft WDM Image Capture
(Win32):0");

        Player player =
Manager.createRealizedPlayer(deviceInfo.getLocator());
        player.start();
        Format[] formats = deviceInfo.getFormats();
        currentFormat = (RGBFormat)formats[3]; // This was the key
***

        formatControl = (FormatControl)player.getControl
( "javax.media.control.FormatControl" );
        formatControl.setFormat ( currentFormat );
        Format currFormat = formatControl.getFormat();
        player.start();

        // Wait a few seconds for camera to initialise (otherwise
img==null)
        Thread.sleep(5000);

        // Grab a frame from the capture device
        FrameGrabbingControl frameGrabber =
(FrameGrabbingControl)player.getControl("javax.media.control.FrameGrabbingControl");
        Buffer buf = frameGrabber.grabFrame();

        // Convert frame to an buffered image so it can be processed
and saved
        Image img = (new
BufferToImage((VideoFormat)buf.getFormat()).createImage(buf));

        BufferedImage buffImg = new BufferedImage(img.getWidth(null),
img.getHeight(null), BufferedImage.TYPE_INT_RGB);

        Graphics2D g = buffImg.createGraphics();
        g.drawImage(img, null, null);

        FileOutputStream out = null;

        try
            {
                out = new FileOutputStream ( "C:/Users/Pictures/
Test1.jpg" );
                JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder
( out );
                JPEGEncodeParam param =
encoder.getDefaultJPEGEncodeParam ( buffImg );
                param.setQuality ( 1.0f, false ); // 100% high
quality setting, no compression
                encoder.setJPEGEncodeParam ( param );
                encoder.encode ( buffImg );
                out.close();
                saved = true;
            }
            catch ( Exception ex )
            {
                System.out.println ("Error saving JPEG : " +
ex.getMessage() );
            }

        // Stop using webcam
        player.stop();
        player.close();
        player.deallocate();
        player = null;
        System.exit(0);
    }
}