src/main/java/org/jcodec/codecs/h264/decode/BlockInterpolator.java
void getLuma13(byte[] pic, int picW, byte[] blk, int blkOff, int blkStride, int x, int y, int blkW, int blkH) {
        getLuma20(pic, picW, blk, blkOff, blkStride, x, y + 1, blkW, blkH);
        getLuma02(pic, picW, tmp3, 0, blkW, x, y, blkW, blkH);

        merge(blk, tmp3, blkOff, blkStride, blkW, blkH);
    }
void getLuma13(byte[] pic, int picW, byte[] blk, int blkOff, int blkStride, int x, int y, int blkW, int blkH) {
        getLuma20(pic, picW, blk, blkOff, blkStride, x, y + 1, blkW, blkH);
        getLuma02(pic, picW, tmp3, 0, blkW, x, y, blkW, blkH);

        merge(blk, tmp3, blkOff, blkStride, blkW, blkH);
    }
void getLuma13 ( byte [ ] pic , int picW , byte [ ] blk , int blkOff , int blkStride , int x , int y , int blkW , int blkH ) { getLuma20 ( pic , picW , blk , blkOff , blkStride , x , y + 1 , blkW , blkH ) ; getLuma02 ( pic , picW , tmp3 , 0 , blkW , x , y , blkW , blkH ) ; merge ( blk , tmp3 , blkOff , blkStride , blkW , blkH ) ; }
Qpel horizontal, Qpel vertical (1, 3)
Qpel horizontal Qpel vertical ( 1 3 )