org.jcodec.scale.Yuv444jToYuv420j Maven / Gradle / Ivy

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Pure Java implementation of video/audio codecs and formats

There is a newer version: 0.2.5

package org.jcodec.scale;

import org.jcodec.common.model.Picture;

/**
 * This class is part of JCodec ( www.jcodec.org ) This software is distributed
 * under FreeBSD License
 * 
 * @author Stanislav Vitvitskyy
 */
public class Yuv444jToYuv420j implements Transform {

    @Override
    public void transform(Picture src, Picture dst) {
        int size = src.getWidth() * src.getHeight();
        System.arraycopy(src.getPlaneData(0), 0, dst.getPlaneData(0), 0, size);
        
        for (int plane = 1; plane < 3; plane++) {
            byte[] srcPl = src.getPlaneData(plane);
            byte[] dstPl = dst.getPlaneData(plane);
            int srcStride = src.getPlaneWidth(plane);
            for (int y = 0, srcOff = 0, dstOff = 0; y < src.getHeight(); y += 2, srcOff += srcStride) {
                for (int x = 0; x < src.getWidth(); x += 2, srcOff += 2, dstOff++) {
                    dstPl[dstOff] = (byte) ((srcPl[srcOff] + srcPl[srcOff + 1] + srcPl[srcOff + srcStride]
                            + srcPl[srcOff + srcStride + 1] + 2) >> 2);
                }
            }
        }
    }
}