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

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+/*
+ * @(#)MJPGImageReaderSpi.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 java.io.IOException;
+import java.io.InputStream;
+import java.util.Locale;
+import javax.imageio.ImageReader;
+import javax.imageio.spi.ImageReaderSpi;
+import javax.imageio.stream.ImageInputStream;
+
+
+/**
+ * ImageIO service provider interface for images in the Motion JPEG (MJPG)
+ * format.
+ * <p>
+ * The reader described by 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: MJPGImageReaderSpi.java 299 2013-01-03 07:40:18Z werner $
+ */
+public class MJPGImageReaderSpi extends ImageReaderSpi {
+
+    public MJPGImageReaderSpi() {
+        super("Werner Randelshofer",//vendor name
+                "1.0",//version
+                new String[]{"MJPG"},//names
+                new String[]{"mjpg"},//suffixes,
+                new String[]{"image/mjpg"},// MIMETypes,
+                "org.monte.media.jmf.renderer.video.MJPGImageReader",// readerClassName,
+                new Class[]{ImageInputStream.class,InputStream.class,byte[].class/*,javax.media.Buffer.class*/},// inputTypes,
+                null,// writerSpiNames,
+                false,// supportsStandardStreamMetadataFormat,
+                null,// nativeStreamMetadataFormatName,
+                null,// nativeStreamMetadataFormatClassName,
+                null,// extraStreamMetadataFormatNames,
+                null,// extraStreamMetadataFormatClassNames,
+                false,// supportsStandardImageMetadataFormat,
+                null,// nativeImageMetadataFormatName,
+                null,// nativeImageMetadataFormatClassName,
+                null,// extraImageMetadataFormatNames,
+                null// extraImageMetadataFormatClassNames
+                );
+    }
+
+    @Override
+    public boolean canDecodeInput(Object source) throws IOException {
+        if (source instanceof ImageInputStream) {
+            ImageInputStream in = (ImageInputStream) source;
+            in.mark();
+
+            // Check if file starts with a JFIF SOI magic (0xffd8=-40)
+            if (in.readShort() != -40) {
+                in.reset();
+                return false;
+            }
+            in.reset();
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public ImageReader createReaderInstance(Object extension) throws IOException {
+        return new MJPGImageReader(this);
+    }
+
+    @Override
+    public String getDescription(Locale locale) {
+        return "MJPG Image Reader";
+    }
+}