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libsrc/avi/src/org/monte/media/jpeg/MJPGImageReader.java

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+/*
+ * @(#)MJPGImageReader.java  
+ * 
+ * Copyright (c) 2010-2011 Werner Randelshofer, Goldau, Switzerland.
+ * All rights reserved.
+ *
+ * You may not use, copy or modify this file, except in compliance with the
+ * license agreement you entered into with Werner Randelshofer.
+ * For details see accompanying license terms.
+ */
+package org.monte.media.jpeg;
+
+import org.monte.media.avi.AVIBMPDIB;
+import com.sun.imageio.plugins.jpeg.JPEGImageReader;
+import java.awt.image.BufferedImage;
+import java.awt.image.DirectColorModel;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Iterator;
+import java.util.LinkedList;
+import javax.imageio.ImageReadParam;
+import javax.imageio.ImageReader;
+import javax.imageio.ImageTypeSpecifier;
+import javax.imageio.metadata.IIOMetadata;
+import javax.imageio.spi.ImageReaderSpi;
+import javax.imageio.stream.ImageInputStream;
+import javax.imageio.stream.MemoryCacheImageInputStream;
+
+/**
+ * Reads an image in the Motion JPEG (MJPG) format.
+ * <p>.
+ * This class can read Motion JPEG files with omitted Huffmann table.
+ * <p>
+ * For more information see:
+ * Microsoft Windows Bitmap Format.
+ * Multimedia Technical Note: JPEG DIB Format.
+ * (c) 1993 Microsoft Corporation. All rights reserved.
+ * <a href="http://www.fileformat.info/format/bmp/spec/b7c72ebab8064da48ae5ed0c053c67a4/BMPDIB.TXT">BMPDIB.txt</a>
+ *
+ * @author Werner Randelshofer
+ * @version $Id: MJPGImageReader.java 299 2013-01-03 07:40:18Z werner $
+ */
+public class MJPGImageReader extends ImageReader {
+
+    private static DirectColorModel RGB = new DirectColorModel(24, 0xff0000, 0xff00, 0xff, 0x0);
+    /** When we read the header, we read the whole image. */
+    private BufferedImage image;
+
+    public MJPGImageReader(ImageReaderSpi originatingProvider) {
+        super(originatingProvider);
+    }
+
+    @Override
+    public int getNumImages(boolean allowSearch) throws IOException {
+        return 1;
+    }
+
+    @Override
+    public int getWidth(int imageIndex) throws IOException {
+        readHeader();
+        return image.getWidth();
+    }
+
+    @Override
+    public int getHeight(int imageIndex) throws IOException {
+        readHeader();
+        return image.getHeight();
+    }
+
+    @Override
+    public Iterator<ImageTypeSpecifier> getImageTypes(int imageIndex) throws IOException {
+        readHeader();
+        LinkedList<ImageTypeSpecifier> l = new LinkedList<ImageTypeSpecifier>();
+        l.add(new ImageTypeSpecifier(RGB, RGB.createCompatibleSampleModel(image.getWidth(), image.getHeight())));
+        return l.iterator();
+    }
+
+    @Override
+    public IIOMetadata getStreamMetadata() throws IOException {
+        return null;
+    }
+
+    @Override
+    public IIOMetadata getImageMetadata(int imageIndex) throws IOException {
+        return null;
+    }
+
+    @Override
+    public BufferedImage read(int imageIndex, ImageReadParam param) throws IOException {
+        if (imageIndex > 0) {
+            throw new IndexOutOfBoundsException();
+        }
+        readHeader();
+
+        return image;
+    }
+
+    /** Reads the image header.
+     * Does nothing if the header has already been loaded.
+     */
+    private void readHeader() throws IOException {
+        if (image == null) {
+            ImageReader r = new JPEGImageReader(getOriginatingProvider());
+            Object in = getInput();
+            /*if (in instanceof Buffer) {
+                Buffer buffer = (Buffer) in;
+                in=buffer.getData();
+            }*/
+            if (in instanceof byte[]) {
+                r.setInput(new MemoryCacheImageInputStream(AVIBMPDIB.prependDHTSeg((byte[]) in)));
+            } else if (in instanceof ImageInputStream) {
+                r.setInput(AVIBMPDIB.prependDHTSeg((ImageInputStream) in));
+            } else {
+                r.setInput(AVIBMPDIB.prependDHTSeg((InputStream) in));
+            }
+            image = r.read(0);
+        }
+    }
+}