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import java.awt.Dimension;

import javax.media.Buffer;
import javax.media.Effect;
import javax.media.Format;
import javax.media.ResourceUnavailableException;
import javax.media.format.RGBFormat;

public class SimpleFilter implements Effect
{
protected Format inputFormat = null;
protected Format outputFormat = null;

protected Format[] inputFormats = null;
protected Format[] outputFormats = null;

public AngelMotionCodec()
{
inputFormats = new Format[]{ new RGBFormat(null, Format.NOT_SPECIFIED, Format.byteArray, Format.NOT_SPECIFIED, 24, 3, 2, 1, 3, Format.NOT_SPECIFIED, Format.TRUE, Format.NOT_SPECIFIED) };
outputFormats = new Format[]{ new RGBFormat(null, Format.NOT_SPECIFIED, Format.byteArray, Format.NOT_SPECIFIED, 24, 3, 2, 1, 3, Format.NOT_SPECIFIED, Format.TRUE, Format.NOT_SPECIFIED) };
}

/****** Codec ******/
public Format[] getSupportedInputFormats()
{
return inputFormats;
}

public Format[] getSupportedOutputFormats(Format input)
{
if(input != null)
{
if(matches(input, inputFormats) != null)
return new Format[]{ outputFormats[0].intersects(input) };
else
return new Format[0];
}

return outputFormats;
}

public int process(Buffer input, Buffer output)
{
// Swap tra input & output
Object tmp = input.getData();

input.setData(output.getData());
output.setData(tmp);

return BUFFER_PROCESSED_OK;
}

public Format setInputFormat(Format input)
{
inputFormat = input;

return input;
}

public Format setOutputFormat(Format output)
{
if(output != null || matches(output, outputFormats) != null)
{
RGBFormat inRGB = (RGBFormat) output;

Dimension size = inRGB.getSize();
int maxDataLength = inRGB.getMaxDataLength();
int lineStride = inRGB.getLineStride();
int flipped = inRGB.getFlipped();

if(size == null)
return null;

if(maxDataLength < size.width*size.height*3)
maxDataLength = size.width*size.height*3;

if(lineStride < size.width*3)
lineStride = size.width*3;

if(flipped != Format.FALSE)
flipped = Format.FALSE;

outputFormat = outputFormats[0].intersects(new RGBFormat(size, maxDataLength, inRGB.getDataType(), inRGB.getFrameRate(), inRGB.getBitsPerPixel(), inRGB.getRedMask(), inRGB.getGreenMask(), inRGB.getBlueMask(), inRGB.getPixelStride(), lineStride, flipped, inRGB.getEndian()));

return outputFormat;
}

return null;
}
/****** Codec ******/

/****** PlugIn ******/
public void close()
{

}

public String getName()
{
return "Simple-Filter";
}

public void open() throws ResourceUnavailableException
{

}

public void reset()
{

}
/****** PlugIn ******/

/****** Controls ******/
public Object getControl(String controlType)
{
return null;
}

public Object[] getControls()
{
return null;
}
/****** Controls ******/

/****** Utility ******/
private Format matches(Format in, Format[] out)
{
if(in != null && out != null)
{
for(int i=0, cnt=out.length; i<cnt; i++)
{
if(in.matches(out[i]))
return out[i];
}
}

return null;
}
/****** Utility ******/
}

source