I watched a great tutorial of Mattew on how to implement audio sounds in Java games.
The problem is that even after I decreased the volume of the wav file when I run the game the volume of the wav sound file is still very high in Java, I mean you can't even play the game because of the background music that is too loud.
Why the volume of the wav file is not maintaining in Java?
It is probably better to use the Java Sound based Clip than the applet based AudioClip. The Clip interface supports controls, one of which should be a MASTER_GAIN.
E.G.
import java.awt.*;
import java.net.URL;
import javax.swing.*;
import javax.swing.event.*;
import javax.sound.sampled.*;
class ClipVolume {
public static void main(String[] args) throws Exception {
URL url = new URL(
"http://pscode.org/media/leftright.wav");
final Clip clip = AudioSystem.getClip();
// getAudioInputStream() also accepts a File or InputStream
AudioInputStream ais = AudioSystem.getAudioInputStream(url);
clip.open(ais);
clip.loop(Clip.LOOP_CONTINUOUSLY);
Runnable r = new Runnable() {
#Override
public void run() {
final FloatControl control = (FloatControl)
clip.getControl(FloatControl.Type.MASTER_GAIN);
final JSlider volume = new JSlider(
JSlider.HORIZONTAL,
(int) control.getMinimum(),
(int) control.getMaximum(),
(int) control.getValue());
volume.addChangeListener(new ChangeListener() {
public void stateChanged(ChangeEvent ce) {
control.setValue(volume.getValue());
}
});
JOptionPane.showMessageDialog(null, volume);
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater(r);
}
}
So, this is the code that i'm using, is working and hope that will help others as well.
happy coding and once again thanks to Andrew Thompson
package com.stefanbanu;
import java.io.*;
import java.net.URL;
import javax.sound.sampled.*;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
// To play sound using Clip, the process need to be alive.
// Hence, we use a Swing application.
public class SoundClipTest extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
// Constructor
public SoundClipTest() {
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setTitle("Test Sound Clip");
this.setSize(300, 200);
this.setVisible(true);
try {
// Open an audio input stream.
URL url = this.getClass().getClassLoader().getResource("bgsong.wav");
AudioInputStream audioIn = AudioSystem.getAudioInputStream(url);
// Get a sound clip resource.
Clip clip = AudioSystem.getClip();
// Open audio clip and load samples from the audio input stream.
clip.open(audioIn);
clip.start();
final FloatControl control = (FloatControl)
clip.getControl(FloatControl.Type.MASTER_GAIN);
control.setValue(-30.0f);
// final JSlider volume = new JSlider(
// JSlider.HORIZONTAL,
// (int) control.getMinimum(),
// (int) control.getMaximum(),
// (int) control.getValue());
// volume.addChangeListener(new ChangeListener() {
//
// public void stateChanged(ChangeEvent ce) {
// control.setValue(volume.getValue());
// }
// });
//
// JOptionPane.showMessageDialog(null, volume);
} catch (UnsupportedAudioFileException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (LineUnavailableException e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
new SoundClipTest();
}
}
I want to create an image from a video using xuggler. The sample code provided generates images from video in an interval, I modified it so that it only generates one image from video. BUT, it looks like it is actually looping through the whole video rather than just taking a snapshot of a specific time then end.
How can I properly generate ONE image from a video without looping through the whole video? On shorter videos this is fine but on hr+ videos, this would become a huge problem.
Below is my code:
import javax.imageio.ImageIO;
import java.io.File;
import java.awt.image.BufferedImage;
import java.util.Random;
import com.xuggle.mediatool.IMediaReader;
import com.xuggle.mediatool.MediaListenerAdapter;
import com.xuggle.mediatool.ToolFactory;
import com.xuggle.mediatool.event.IVideoPictureEvent;
import com.xuggle.xuggler.Global;
public class Test extends MediaListenerAdapter {
public static final double SECONDS_BETWEEN_FRAMES = 1;
public static final long MICRO_SECONDS_BETWEEN_FRAMES = (long)(Global.DEFAULT_PTS_PER_SECOND * SECONDS_BETWEEN_FRAMES);
private int mVideoStreamIndex = -1;
boolean takeImage = true;
public static void main(String[] args) {
new Test("src/main/Wildlife_ 512kb, hkf.mp4");
}
public Test(String filename) {
System.out.println("starting the xuggler");
IMediaReader reader = ToolFactory.makeReader(filename);
reader.setBufferedImageTypeToGenerate(BufferedImage.TYPE_3BYTE_BGR);
reader.addListener(this);
while (reader.readPacket() == null) { do { } while(false); }
}
public void onVideoPicture(IVideoPictureEvent event) {
try {
if (event.getStreamIndex() != mVideoStreamIndex) {
if (-1 == mVideoStreamIndex) {
mVideoStreamIndex = event.getStreamIndex();
} else {
return;
}
}
if (event.getTimeStamp() > MICRO_SECONDS_BETWEEN_FRAMES && takeImage) {
Random random = new Random();
File file = new File("/Users/yao/__TEMP__/media_upload_temp/" + random.nextInt(Integer.MAX_VALUE) + ".png");
ImageIO.write(event.getImage(), "png", file);
double seconds = ((double)event.getTimeStamp()) / Global.DEFAULT_PTS_PER_SECOND;
System.out.printf("at elapsed time of %6.3f seconds wrote: %s\n", seconds, file);
takeImage = false;
}
} catch (Exception e) { e.printStackTrace(); }
}
}
Basically, I just aded a boolean field and use that to manage when to break out of loop/video after one image was capture.
while (reader.readPacket() == null) {
if (!takeImage) {
reader.removeListener(this);
break;
}
}
I am trying to extract an image from the requested website, then save it to a folder. The only problem is that the website I am pulling the image from has multiple image formats. So the extension for the image would be either png, jpg, or gif. I need to save all of these, but I do not know how to tell my program to extract multiple formats rather than just one..
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class Main {
public static void main( String[] args )
{
int avatarnum = 1;
String extension = null;
BufferedImage image = null;
extension = "jpg";
while(avatarnum <= 1000){
try {
URL url = new URL("http://forum.blockland.us/avatarUpload/avatar_"+avatarnum+"."+extension);
image = ImageIO.read(url);
try{
ImageIO.write(image, extension,new File("C:\\test\\"+avatarnum+"."+extension));
System.out.println("Write successful");
avatarnum ++;
} catch(Exception e){
System.out.println("Printing stacktrace");
e.printStackTrace();
}
avatarnum ++;
} catch (IOException e) {
System.out.println("File not found! " + avatarnum);
System.out.println("Adding one to variable and retrying..");
avatarnum ++;
}
}
System.out.println("Done");
}
}
As of now, only jpg images are being extracted from the website and saved to the folder.
For testing purposes it will only pull 1,000 images from the site.
I will be using this to make an "avatar database" if anyone was wondering.
Thanks a ton guys!
You need iterate over multiple image formats (extensions):
public static void main(String[] args) {
int avatarnum = 1;
BufferedImage image = null;
String[] extensions = { "jpg", "png", "gif", "bmp" };
while (avatarnum <= 1000) {
for (String extension : extensions) {
try {
URL url = new URL("http://forum.blockland.us/avatarUpload/avatar_" + avatarnum + "." + extension);
image = ImageIO.read(url);
try {
ImageIO.write(image, extension, new File("C:\\test\\" + avatarnum + "." + extension));
System.out.println("Write successful");
} catch (Exception e) {
System.out.println("Error on save the image");
}
} catch (IOException e) {
System.out.println("File not found! " + avatarnum + "." + extension);
}
}
avatarnum++;
}
System.out.println("Done");
}
Use an array with all valid extensions
String[] extensions = {"jpg", "png", "gif" };
And loop over all of them when retreive the URL
try {
for (String extension: extensions){
try {
URL url = new URL("http://forum.blockland.us/avatarUpload/avatar_"+avatarnum+"."+extension);
image = ImageIO.read(url);
} catch (Exception e){
//Wrong extension (or other kind of error)
}
}
...
For every image, it will fail with the wrong extensions, but will retreive the one with the correct
I am trying to implement some ocr using a guide from on stackoverflow. the example code for the use of the application is using java and i am trying to run it on android. Here is the code from the example;
// OCRScannerDemo.java
// Copyright (c) 2003-2009 Ronald B. Cemer
// All rights reserved.
/*
This program 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, version 2 of the License.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.roncemer.ocr.main;
import java.awt.Frame;
import java.awt.Image;
import java.awt.MediaTracker;
import java.awt.ScrollPane;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.ImageProducer;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import com.roncemer.ocr.CharacterRange;
import com.roncemer.ocr.OCRImageCanvas;
import com.roncemer.ocr.OCRScanner;
import com.roncemer.ocr.PixelImage;
import com.roncemer.ocr.TrainingImageLoader;
import com.roncemer.ocr.tracker.MediaTrackerProxy;
/**
* Demo application to demonstrate OCR document scanning and decoding.
* #author Ronald B. Cemer
*/
public class OCRScannerDemo extends Frame {
private static final long serialVersionUID = -8030499184564680363L;
private boolean debug = true;
private Image image;
private OCRImageCanvas imageCanvas;
private OCRScanner scanner;
public OCRScannerDemo() {
super("OCR from a scanned image");
setSize(1024, 768);
ScrollPane scrollPane = new ScrollPane();
imageCanvas = new OCRImageCanvas();
scrollPane.add(imageCanvas);
add(scrollPane);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
((Frame)(e.getSource())).hide();
System.exit(0);
}
});
scanner = new OCRScanner();
show();
}
/**
* Load demo training images.
* #param trainingImageDir The directory from which to load the images.
*/
public void loadTrainingImages(String trainingImageDir) {
if (debug) System.err.println("loadTrainingImages(" + trainingImageDir + ")");
if (!trainingImageDir.endsWith(File.separator)) {
trainingImageDir += File.separator;
}
try {
scanner.clearTrainingImages();
TrainingImageLoader loader = new TrainingImageLoader();
HashMap images = new HashMap();
if (debug) System.err.println("ascii.png");
loader.load(
this,
trainingImageDir + "ascii.png",
new CharacterRange('!', '~'),
images);
if (debug) System.err.println("hpljPica.jpg");
loader.load(
this,
trainingImageDir + "hpljPica.jpg",
new CharacterRange('!', '~'),
images);
if (debug) System.err.println("digits.jpg");
loader.load(
this,
trainingImageDir + "digits.jpg",
new CharacterRange('0', '9'),
images);
if (debug) System.err.println("adding images");
scanner.addTrainingImages(images);
if (debug) System.err.println("loadTrainingImages() done");
}
catch(IOException ex) {
ex.printStackTrace();
System.exit(2);
}
}
public void process(String imageFilename) {
if (debug) System.err.println("process(" + imageFilename + ")");
String imageFileUrlString = "";
try {
imageFileUrlString = new File(imageFilename).toURL().toString();
} catch (MalformedURLException e) {
e.printStackTrace();
}
try {
ImageProducer imageProducer = (ImageProducer)
(new URL(imageFileUrlString).getContent());
image = createImage(imageProducer);
}
catch(IOException e) {
e.printStackTrace();
}
if (image == null) {
System.err.println("Cannot find image file at " + imageFileUrlString);
return;
}
MediaTracker mt = new MediaTrackerProxy(this);
mt.addImage(image, 0);
try {
mt.waitForAll();
} catch(InterruptedException ex) {}
if (debug) System.err.println("image loaded");
/* int w = image.getWidth(null);
int h = image.getHeight(null);
if ( (w > 0) && (h > 0) ) {
float scaleFactor = 2048.0f/(float)Math.max(w, h);
if (scaleFactor < 1.0f) {
image = image.getScaledInstance(
(int)((float)w*scaleFactor),
(int)((float)h*scaleFactor), Image.SCALE_SMOOTH);
mt = new MediaTrackerProxy(this);
mt.addImage(image, 0);
try { mt.waitForAll(); } catch(InterruptedException ex) {}
}
}*/
imageCanvas.setSize(image.getWidth(null), image.getHeight(null));
if (debug) System.err.println("constructing new PixelImage");
PixelImage pixelImage = new PixelImage(image);
if (debug) System.err.println("converting PixelImage to grayScale");
pixelImage.toGrayScale(true);
if (debug) System.err.println("filtering");
pixelImage.filter();
if (debug) System.err.println("setting image for display");
imageCanvas.setImage(
pixelImage.rgbToImage(
pixelImage.grayScaleToRGB(pixelImage.pixels),
pixelImage.width,
pixelImage.height,
imageCanvas));
System.out.println(imageFilename + ":");
String text = scanner.scan(image, 0, 0, 0, 0, null, imageCanvas.getGraphics());
System.out.println("[" + text + "]");
}
public static void main(String[]args) {
if (args.length < 1) {
System.err.println("Please specify one or more image filenames.");
System.exit(1);
}
String trainingImageDir = System.getProperty("TRAINING_IMAGE_DIR");
if (trainingImageDir == null) {
System.err.println
("Please specify -DTRAINING_IMAGE_DIR=<dir> on " +
"the java command line.");
return;
}
OCRScannerDemo demo = new OCRScannerDemo();
demo.loadTrainingImages(trainingImageDir);
for (int i = 0; i < args.length; i++)
demo.process(args[i]);
System.out.println("done.");
}
}
In the process method an ImageProducer is used. Is there an alternative for android or had i might as well give up using this approach?
Kind regards
A bit late reply, but I guess it may help readers.
On Android, consider the android.graphics.Bitmap class as entry point for building images.
It is a straight forward simplification about creating and using images, when compared to Java AWT API. Android's Bitmap class resembles a lot the java.awt.BufferedImage, one with set/getPixel methdos and another one with set/getRGB, as well some methods to create bitmaps (images) from different sources.
How can I continuously capture images from a webcam?
I want to experiment with object recognition (by maybe using java media framework).
I was thinking of creating two threads
one thread:
Node 1: capture live image
Node 2: save image as "1.jpg"
Node 3: wait 5 seconds
Node 4: repeat...
other thread:
Node 1: wait until image is captured
Node 2: using the "1.jpg" get colors
from every pixle
Node 3: save data in arrays
Node 4: repeat...
This JavaCV implementation works fine.
Code:
import org.bytedeco.javacv.*;
import org.bytedeco.opencv.opencv_core.IplImage;
import java.io.File;
import static org.bytedeco.opencv.global.opencv_core.cvFlip;
import static org.bytedeco.opencv.helper.opencv_imgcodecs.cvSaveImage;
public class Test implements Runnable {
final int INTERVAL = 100;///you may use interval
CanvasFrame canvas = new CanvasFrame("Web Cam");
public Test() {
canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
}
public void run() {
new File("images").mkdir();
FrameGrabber grabber = new OpenCVFrameGrabber(0); // 1 for next camera
OpenCVFrameConverter.ToIplImage converter = new OpenCVFrameConverter.ToIplImage();
IplImage img;
int i = 0;
try {
grabber.start();
while (true) {
Frame frame = grabber.grab();
img = converter.convert(frame);
//the grabbed frame will be flipped, re-flip to make it right
cvFlip(img, img, 1);// l-r = 90_degrees_steps_anti_clockwise
//save
cvSaveImage("images" + File.separator + (i++) + "-aa.jpg", img);
canvas.showImage(converter.convert(img));
Thread.sleep(INTERVAL);
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
Test gs = new Test();
Thread th = new Thread(gs);
th.start();
}
}
There is also post on configuration for JavaCV
You can modify the code and be able to save the images in regular interval and do rest of the processing you want.
Some time ago I've created generic Java library which can be used to take pictures with a PC webcam. The API is very simple, not overfeatured, can work standalone, but also supports additional webcam drivers like OpenIMAJ, JMF, FMJ, LTI-CIVIL, etc, and some IP cameras.
Link to the project is https://github.com/sarxos/webcam-capture
Example code (take picture and save in test.jpg):
Webcam webcam = Webcam.getDefault();
webcam.open();
BufferedImage image = webcam.getImage();
ImageIO.write(image, "JPG", new File("test.jpg"));
It is also available in Maven Central Repository or as a separate ZIP which includes all required dependencies and 3rd party JARs.
JMyron is very simple for use.
http://webcamxtra.sourceforge.net/
myron = new JMyron();
myron.start(imgw, imgh);
myron.update();
int[] img = myron.image();
Here is a similar question with some - yet unaccepted - answers. One of them mentions FMJ as a java alternative to JMF.
This kind of goes off of gt_ebuddy's answer using JavaCV, but my video output is at a much higher quality then his answer. I've also added some other random improvements (such as closing down the program when ESC and CTRL+C are pressed, and making sure to close down the resources the program uses properly).
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import javax.swing.AbstractAction;
import javax.swing.ActionMap;
import javax.swing.InputMap;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.KeyStroke;
import com.googlecode.javacv.CanvasFrame;
import com.googlecode.javacv.OpenCVFrameGrabber;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
public class HighRes extends JComponent implements Runnable {
private static final long serialVersionUID = 1L;
private static CanvasFrame frame = new CanvasFrame("Web Cam");
private static boolean running = false;
private static int frameWidth = 800;
private static int frameHeight = 600;
private static OpenCVFrameGrabber grabber = new OpenCVFrameGrabber(0);
private static BufferedImage bufImg;
public HighRes()
{
// setup key bindings
ActionMap actionMap = frame.getRootPane().getActionMap();
InputMap inputMap = frame.getRootPane().getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
for (Keys direction : Keys.values())
{
actionMap.put(direction.getText(), new KeyBinding(direction.getText()));
inputMap.put(direction.getKeyStroke(), direction.getText());
}
frame.getRootPane().setActionMap(actionMap);
frame.getRootPane().setInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW, inputMap);
// setup window listener for close action
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
stop();
}
});
}
public static void main(String... args)
{
HighRes webcam = new HighRes();
webcam.start();
}
#Override
public void run()
{
try
{
grabber.setImageWidth(frameWidth);
grabber.setImageHeight(frameHeight);
grabber.start();
while (running)
{
final IplImage cvimg = grabber.grab();
if (cvimg != null)
{
// cvFlip(cvimg, cvimg, 1); // mirror
// show image on window
bufImg = cvimg.getBufferedImage();
frame.showImage(bufImg);
}
}
grabber.stop();
grabber.release();
frame.dispose();
}
catch (Exception e)
{
e.printStackTrace();
}
}
public void start()
{
new Thread(this).start();
running = true;
}
public void stop()
{
running = false;
}
private class KeyBinding extends AbstractAction {
private static final long serialVersionUID = 1L;
public KeyBinding(String text)
{
super(text);
putValue(ACTION_COMMAND_KEY, text);
}
#Override
public void actionPerformed(ActionEvent e)
{
String action = e.getActionCommand();
if (action.equals(Keys.ESCAPE.toString()) || action.equals(Keys.CTRLC.toString())) stop();
else System.out.println("Key Binding: " + action);
}
}
}
enum Keys
{
ESCAPE("Escape", KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0)),
CTRLC("Control-C", KeyStroke.getKeyStroke(KeyEvent.VK_C, KeyEvent.CTRL_DOWN_MASK)),
UP("Up", KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0)),
DOWN("Down", KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0)),
LEFT("Left", KeyStroke.getKeyStroke(KeyEvent.VK_LEFT, 0)),
RIGHT("Right", KeyStroke.getKeyStroke(KeyEvent.VK_RIGHT, 0));
private String text;
private KeyStroke keyStroke;
Keys(String text, KeyStroke keyStroke)
{
this.text = text;
this.keyStroke = keyStroke;
}
public String getText()
{
return text;
}
public KeyStroke getKeyStroke()
{
return keyStroke;
}
#Override
public String toString()
{
return text;
}
}
You can try Java Webcam SDK library also.
SDK demo applet is available at link.
I have used JMF on a videoconference application and it worked well on two laptops: one with integrated webcam and another with an old USB webcam. It requires JMF being installed and configured before-hand, but once you're done you can access the hardware via Java code fairly easily.
You can try Marvin Framework. It provides an interface to work with cameras. Moreover, it also provides a set of real-time video processing features, like object tracking and filtering.
Take a look!
Real-time Video Processing Demo:
http://www.youtube.com/watch?v=D5mBt0kRYvk
You can use the source below. Just save a frame using MarvinImageIO.saveImage() every 5 second.
Webcam video demo:
public class SimpleVideoTest extends JFrame implements Runnable{
private MarvinVideoInterface videoAdapter;
private MarvinImage image;
private MarvinImagePanel videoPanel;
public SimpleVideoTest(){
super("Simple Video Test");
videoAdapter = new MarvinJavaCVAdapter();
videoAdapter.connect(0);
videoPanel = new MarvinImagePanel();
add(videoPanel);
new Thread(this).start();
setSize(800,600);
setVisible(true);
}
#Override
public void run() {
while(true){
// Request a video frame and set into the VideoPanel
image = videoAdapter.getFrame();
videoPanel.setImage(image);
}
}
public static void main(String[] args) {
SimpleVideoTest t = new SimpleVideoTest();
t.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
For those who just want to take a single picture:
WebcamPicture.java
public class WebcamPicture {
public static void main(String[] args) {
try{
MarvinVideoInterface videoAdapter = new MarvinJavaCVAdapter();
videoAdapter.connect(0);
MarvinImage image = videoAdapter.getFrame();
MarvinImageIO.saveImage(image, "./res/webcam_picture.jpg");
} catch(MarvinVideoInterfaceException e){
e.printStackTrace();
}
}
}
I used Webcam Capture API. You can download it from here
webcam = Webcam.getDefault();
webcam.open();
if (webcam.isOpen()) { //if web cam open
BufferedImage image = webcam.getImage();
JLabel imageLbl = new JLabel();
imageLbl.setSize(640, 480); //show captured image
imageLbl.setIcon(new ImageIcon(image));
int showConfirmDialog = JOptionPane.showConfirmDialog(null, imageLbl, "Image Viewer", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, new ImageIcon(""));
if (showConfirmDialog == JOptionPane.YES_OPTION) {
JFileChooser chooser = new JFileChooser();
chooser.setDialogTitle("Save Image");
chooser.setFileFilter(new FileNameExtensionFilter("IMAGES ONLY", "png", "jpeg", "jpg")); //this file extentions are shown
int showSaveDialog = chooser.showSaveDialog(this);
if (showSaveDialog == 0) { //if pressed 'Save' button
String filePath = chooser.getCurrentDirectory().toString().replace("\\", "/");
String fileName = chooser.getSelectedFile().getName(); //get user entered file name to save
ImageIO.write(image, "PNG", new File(filePath + "/" + fileName + ".png"));
}
}
}
http://grack.com/downloads/school/enel619.10/report/java_media_framework.html
Using the Player with Swing
The Player can be easily used in a Swing application as well. The following code creates a Swing-based TV capture program with the video output displayed in the entire window:
import javax.media.*;
import javax.swing.*;
import java.awt.*;
import java.net.*;
import java.awt.event.*;
import javax.swing.event.*;
public class JMFTest extends JFrame {
Player _player;
JMFTest() {
addWindowListener( new WindowAdapter() {
public void windowClosing( WindowEvent e ) {
_player.stop();
_player.deallocate();
_player.close();
System.exit( 0 );
}
});
setExtent( 0, 0, 320, 260 );
JPanel panel = (JPanel)getContentPane();
panel.setLayout( new BorderLayout() );
String mediaFile = "vfw://1";
try {
MediaLocator mlr = new MediaLocator( mediaFile );
_player = Manager.createRealizedPlayer( mlr );
if (_player.getVisualComponent() != null)
panel.add("Center", _player.getVisualComponent());
if (_player.getControlPanelComponent() != null)
panel.add("South", _player.getControlPanelComponent());
}
catch (Exception e) {
System.err.println( "Got exception " + e );
}
}
public static void main(String[] args) {
JMFTest jmfTest = new JMFTest();
jmfTest.show();
}
}
Java usually doesn't like accessing hardware, so you will need a driver program of some sort, as goldenmean said. I've done this on my laptop by finding a command line program that snaps a picture. Then it's the same as goldenmean explained; you run the command line program from your java program in the takepicture() routine, and the rest of your code runs the same.
Except for the part about reading pixel values into an array, you might be better served by saving the file to BMP, which is nearly that format already, then using the standard java image libraries on it.
Using a command line program adds a dependency to your program and makes it less portable, but so was the webcam, right?
I believe the web-cam application software which comes along with the web-cam, or you native windows webcam software can be run in a batch script(windows/dos script) after turning the web cam on(i.e. if it needs an external power supply). In the bacth script , u can add appropriate delay to capture after certain time period. And keep executing the capture command in loop.
I guess this should be possible
-AD
There's a pretty nice interface for this in processing, which is kind of a pidgin java designed for graphics. It gets used in some image recognition work, such as that link.
Depending on what you need out of it, you might be able to load the video library that's used there in java, or if you're just playing around with it you might be able to get by using processing itself.
FMJ can do this, as can the supporting library it uses, LTI-CIVIL. Both are on sourceforge.
Recommand using FMJ for multimedia relatived java app.
Try using JMyron How To Use Webcam Using Java. I think using JMyron is the easiest way to access a webcam using java. I tried to use it with a 64-bit processor, but it gave me an error. It worked just fine on a 32-bit processor, though.