jpegrenderer.java

FMJ（freedom media for java)是java视频开发的新选择

package net.sf.fmj.media.renderer.video;

import java.awt.Component;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.imageio.ImageIO;
import javax.media.Buffer;
import javax.media.Format;
import javax.media.format.JPEGFormat;
import javax.media.format.VideoFormat;
import javax.media.renderer.VideoRenderer;

import net.sf.fmj.media.AbstractVideoRenderer;
import net.sf.fmj.utility.LoggerSingleton;

/**
 * 
 * @author Ken Larson
 *
 */
public class JPEGRenderer extends AbstractVideoRenderer implements VideoRenderer
{
	private static final Logger logger = LoggerSingleton.logger;

	private boolean scale;
	
	private final Format[] supportedInputFormats = new Format[] {
		new JPEGFormat()
	};
	
	
	//@Override
	public String getName()
	{
		return "JPEG Renderer";
	}


	//@Override
	public Format[] getSupportedInputFormats()
	{
		return supportedInputFormats;
	}

	private JVideoComponent component = new JVideoComponent();
	public Component getComponent()
	{	return component;
	}
	
	private Object[] controls = new Object[] {this};
	public Object[] getControls()
	{	return controls;
	}
	
	//@Override
	public Format setInputFormat(Format format)
	{
		VideoFormat chosenFormat =  (VideoFormat) super.setInputFormat(format);
		if (chosenFormat != null) {
			getComponent().setPreferredSize(chosenFormat.getSize());
		}
		return chosenFormat;
	}


	@Override
	public int doProcess(Buffer buffer)
	{
		if (buffer.getData() == null)
			return BUFFER_PROCESSED_FAILED;		// TODO: check for EOM?

		if (buffer.isDiscard())
		{	logger.warning("JPEGRenderer passed buffer with discard flag");
			return BUFFER_PROCESSED_FAILED;
		}
		
		final java.awt.Image image;
		try
		{
			image = ImageIO.read(new ByteArrayInputStream((byte []) buffer.getData(), buffer.getOffset(), buffer.getLength()));
		} catch (IOException e)
		{
			logger.log(Level.WARNING, "" + e, e);
			return BUFFER_PROCESSED_FAILED;
		}
		
		if (image == null)
		{
			logger.log(Level.WARNING, "Failed to read image (ImageIO.read returned null).");
			return BUFFER_PROCESSED_FAILED;
		}
		
		try
		{
			component.setImage(image);
		}
		catch (Exception e)
		{
			logger.log(Level.WARNING, "" + e, e);
			return BUFFER_PROCESSED_FAILED;
		}
		return BUFFER_PROCESSED_OK;
	}	
}