/*****************************************************************************
*
* XVID MPEG-4 VIDEO CODEC
* - 8x8 block-based halfpel interpolation -
*
* Copyright(C) 2002 Peter Ross
* Copyright(C) 2002 MinChen
*
* This file is part of XviD, a free MPEG-4 video encoder/decoder
*
* XviD is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Under section 8 of the GNU General Public License, the copyright
* holders of XVID explicitly forbid distribution in the following
* countries:
*
* - Japan
* - United States of America
*
* Linking XviD statically or dynamically with other modules is making a
* combined work based on XviD. Thus, the terms and conditions of the
* GNU General Public License cover the whole combination.
*
* As a special exception, the copyright holders of XviD give you
* permission to link XviD with independent modules that communicate with
* XviD solely through the VFW1.1 and DShow interfaces, regardless of the
* license terms of these independent modules, and to copy and distribute
* the resulting combined work under terms of your choice, provided that
* every copy of the combined work is accompanied by a complete copy of
* the source code of XviD (the version of XviD used to produce the
* combined work), being distributed under the terms of the GNU General
* Public License plus this exception. An independent module is a module
* which is not derived from or based on XviD.
*
* Note that people who make modified versions of XviD are not obligated
* to grant this special exception for their modified versions; it is
* their choice whether to do so. The GNU General Public License gives
* permission to release a modified version without this exception; this
* exception also makes it possible to release a modified version which
* carries forward this exception.
*
* $Id: interpolate8x8.c,v 1.9 2003/02/11 21:56:31 edgomez Exp $
*
****************************************************************************/
#include "../portab.h"
#include "interpolate8x8.h"
/* function pointers */
INTERPOLATE8X8_PTR interpolate8x8_halfpel_h;
INTERPOLATE8X8_PTR interpolate8x8_halfpel_v;
INTERPOLATE8X8_PTR interpolate8x8_halfpel_hv;
/* dst = interpolate(src) */
void
interpolate8x8_halfpel_h_c(uint8_t * const dst,
const uint8_t * const src,
const uint32_t stride,
const uint32_t rounding)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
int32_t tot =
(int32_t) src[j * stride + i] + (int32_t) src[j * stride + i + 1];
tot = (tot + 1 - rounding) >> 1;
dst[j * stride + i] = (uint8_t) tot;
}
}
}
void
interpolate8x8_halfpel_v_c(uint8_t * const dst,
const uint8_t * const src,
const uint32_t stride,
const uint32_t rounding)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
int32_t tot =
(int32_t)src[j * stride + i] + (int32_t)src[j * stride + i + stride];
tot = ((tot + 1 - rounding) >> 1);
dst[j * stride + i] = (uint8_t) tot;
}
}
}
void
interpolate8x8_halfpel_hv_c(uint8_t * const dst,
const uint8_t * const src,
const uint32_t stride,
const uint32_t rounding)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
int32_t tot =
(int32_t)src[j * stride + i] + (int32_t)src[j * stride + i + 1] +
(int32_t)src[j * stride + i + stride] + (int32_t)src[j * stride + i + stride + 1];
tot = ((tot + 2 - rounding) >> 2);
dst[j * stride + i] = (uint8_t) tot;
}
}
}
/* add by MinChen */
/* interpolate8x8 two pred block */
void
interpolate8x8_c(uint8_t * const dst,
const uint8_t * const src,
const uint32_t x,
const uint32_t y,
const uint32_t stride)
{
uint32_t i, j;
for (j = 0; j < 8; j++) {
for (i = 0; i < 8; i++) {
int32_t tot =
(((int32_t)src[(y + j) * stride + x + i] +
(int32_t)dst[(y + j) * stride + x + i] + 1) >> 1);
dst[(y + j) * stride + x + i] = (uint8_t) tot;
}
}
}