public static void h264_qpel_mc21_c(int opcode, int size, byte[] dst_base, int dst_offset, byte[] src_base, int src_offset, int stride)
{
short[] tmp = new short[size * (size + 5)];
byte[] halfH = new byte[size * size];
byte[] halfHV = new byte[size * size];
h264_qpel_h_lowpass(0, size, halfH, 0, src_base, src_offset, size, stride);
h264_qpel_hv_lowpass(0, size, halfHV, 0, tmp, 0, src_base, src_offset, size, size, stride);
pixels_l2(opcode, size, dst_base, dst_offset, halfH, 0, halfHV, 0, stride, size, size, size);
}