Discussion :

[gilles81]

salut,
j'ai pri des photos avec ma webcam et j'essaye maintenant de créer une vidéo á partir de ces photos.
mon programme compte trois classes au total:

Code :

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import java.util.Vector;
 
import javax.media.MediaLocator;
import javax.media.Time;
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PullBufferDataSource;
import javax.media.protocol.PullBufferStream;
 
public class ImageDataSource extends PullBufferDataSource{
ImageSourceStream streams[];
private Time DURATION_UNKNOWN;
ImageDataSource(int width, int height, int frameRate, Vector images)
{
streams = new ImageSourceStream[1];
streams[0] = new ImageSourceStream(width, height, frameRate, images);
}
public void setLocator(MediaLocator source) {}
public MediaLocator getLocator() {
	return null;
	}
public String getContentType() {
	return ContentDescriptor.RAW;
	}
	public void connect() { }
	public void disconnect() { }
	public void start() { }
	public void stop() { }
	/**
        * Return the ImageSourceStreams.
        */
	public PullBufferStream[] getStreams() {
	return streams;
	}
	/**
        * We could have derived the duration from the number of
        * frames and frame rate. But for the purpose of this program,
        * it's not necessary.
        */
	public Time getDuration() {
	return DURATION_UNKNOWN;
	}
	public Object[] getControls() {
	return new Object[0];
	}
	public Object getControl(String type) {
	return null;
	}
	}

Code :

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import java.awt.Dimension;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.Vector;
 
import javax.media.Buffer;
import javax.media.Format;
import javax.media.format.VideoFormat;
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PullBufferStream;
 
 
 
	public class ImageSourceStream implements PullBufferStream {
		Vector images;
		int width, height;
		VideoFormat format;
		int nextImage = 0; // index of the next image to be read.
		boolean ended = false;
		public ImageSourceStream(int width, int height, int frameRate, Vector images) {
		this.width = width;
		this.height = height;
		this.images = images;
		format = new VideoFormat(VideoFormat.JPEG,
		new Dimension(width, height), Format.NOT_SPECIFIED,
		Format.byteArray, (float) frameRate);
		}
		/**
                * We should never need to block assuming data are read from files.
                */
		public boolean willReadBlock() {
		return false;
		}
		/**
                * This is called from the Processor to read a frame worth of video data.
                */
		public void read(Buffer buf) throws IOException {
			// Check if we've finished all the frames.
			if (nextImage >= images.size()) {
			// We are done. Set EndOfMedia.
			System.err.println("Done reading all images.");
			buf.setEOM(true);
			buf.setOffset(0);
			buf.setLength(0);
			ended = true;
			return;
			}
			String imageFile = (String) images.elementAt(nextImage);
			nextImage++;
			System.err.println(" - reading image file: " + imageFile);
			// Open a random access file for the next image.
			RandomAccessFile raFile;
			raFile = new RandomAccessFile(imageFile, "r");
			byte data[] = null;
			// Check the input buffer type & size.
			if (buf.getData() instanceof byte[])
			data = (byte[]) buf.getData();
			// Check to see the given buffer is big enough for the frame.
			if (data == null || data.length < raFile.length()) {
			data = new byte[(int) raFile.length()];
			buf.setData(data);
			}
			// Read the entire JPEG image from the file.
			raFile.readFully(data, 0, (int) raFile.length());
			System.err.println(" read " + raFile.length() + " bytes.");
			buf.setOffset(0);
			buf.setLength((int) raFile.length());
			buf.setFormat(format);
			buf.setFlags(buf.getFlags() | Buffer.FLAG_KEY_FRAME);
			// Close the random access file.
			raFile.close();
		}
		/**
                * Return the format of each video frame. That will be JPEG.
                */
		public Format getFormat() {
		return format;
		}
		public ContentDescriptor getContentDescriptor() {
		return new ContentDescriptor(ContentDescriptor.RAW);
		}
		public long getContentLength() {
		return 0;
		}
		public boolean endOfStream() {
		return ended;
		}
		public Object[] getControls() {
		return new Object[0];
		}
		public Object getControl(String type) {
		return null;
		}
 
 
		}

ces deux classes me permettent de créer un datasource
et enfin ma classe JpegMovies

Code :

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import java.io.File;
import java.util.*;
 
import javax.media.DataSink;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Processor;
 
import javax.media.format.VideoFormat;
import javax.media.protocol.*;
 
 
public class JpegMovies {
public static void main(String []args)throws Exception{
	Vector images = new Vector();
 
//	for(int i=0;i<Integer.parseInt(args[2]);++i)
	images.addElement("c:\\test1.jpg");
	images.addElement("c:\\test2.jpg");
	images.addElement("c:\\test3.jpg");
	images.addElement("c:\\test4.jpg");
	images.addElement("c:\\test5.jpg");
 
	ImageDataSource ids = new ImageDataSource(320,240,6,images);
 
	Processor processor = Manager.createProcessor(ids);
 
	processor.configure();
 
	while(processor.getState() != Processor.Configured) Thread.sleep(10);
 
	processor.setContentDescriptor(new FileTypeDescriptor(FileTypeDescriptor.QUICKTIME));
 
	VideoFormat vfmt = new VideoFormat(VideoFormat.CINEPAK);
	(processor.getTrackControls())[0].setFormat(vfmt);
	processor.realize();
	while(processor.getState() != Processor.Realized) Thread.sleep(10);
	DataSource procOutput = processor.getDataOutput();
	MediaLocator dest = new MediaLocator(new File("C//Bilder").toURL());
	DataSink dsink = Manager.createDataSink(procOutput, dest);
	dsink.open();
	processor.start();
	dsink.start();
	while(processor.getState() != Processor.Started) Thread.sleep(10);
	while (processor.getState() ==Processor.Started) Thread.sleep(10);
	processor.close();
	dsink.close();
	System.exit(0);
	}
	}

quand j'exécute un message d'erreur apparait sur la console:
java.lang.NullPointerException
Exception in thread "main" javax.media.NoProcessorException: Error instantiating class: com.sun.media.processor.unknown.Handler : java.lang.NullPointerException
at javax.media.Manager.createProcessorForSource(Manager.java:1755)
at javax.media.Manager.createProcessor(Manager.java:666)
at JpegMovies.main(JpegMovies.java:26)
il m'indique que l'erreu est sur la ligne suivante:
Processor processor = Manager.createProcessor(ids);

quelqu'un peut il m'aider svp

merci d'avance