Jpeg Movies et DataSource
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:
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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;
}
} |
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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
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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
