/************************************************************************** * *  XVID MPEG-4 VIDEO CODEC *  -  MB prediction header file  - * *  Copyright(C) 2002 Christoph Lampert <gruel@web.de> *               2002 Peter Ross <pross@xvid.org> * *  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: mbprediction.h,v 1.1.1.1 2005/09/15 06:18:09 ivan Exp $ * *************************************************************************/#ifndef _MBPREDICTION_H_#define _MBPREDICTION_H_#include "../portab.h"#include "../decoder.h"#include "../global.h"#define MIN(X, Y) ((X)<(Y)?(X):(Y))#define MAX(X, Y) ((X)>(Y)?(X):(Y))/* very large value */#define MV_MAX_ERROR	(4096 * 256)#define MVequal(A,B) ( ((A).x)==((B).x) && ((A).y)==((B).y) )/***************************************************************************** * Inlined functions ****************************************************************************//* * MODE_INTER, vm18 page 48 * MODE_INTER4V vm18 page 51 * *   (x,y-1)      (x+1,y-1) *   [   |   ]    [   |   ] *   [ 2 | 3 ]    [ 2 |   ] * *   (x-1,y)       (x,y)        (x+1,y) *   [   | 1 ]    [ 0 | 1 ]    [ 0 |   ] *   [   | 3 ]    [ 2 | 3 ]    [   |   ] */static __inline union VECTOR1get_pmv_average(const MACROBLOCK * const mbs,         const int mb_width,         const int x,         const int y,         const int block){	static const union VECTOR1 zeroMV = {0};    	int lx, ly, lz;         /* left */	int tx, ty, tz;         /* top */	int rx, ry, rz;         /* top-right */	int lpos, tpos, rpos;	union VECTOR1 pmv[4];	/* left neighbour, top neighbour, top-right neighbour */	switch (block) {		case 0:			lx = x - 1;	ly = y;		lz = 1;			tx = x;		ty = y - 1;	tz = 2;			rx = x + 1;	ry = y - 1;	rz = 2;			break;		case 1:			lx = x;		ly = y;		lz = 0;			tx = x;		ty = y - 1;	tz = 3;			rx = x + 1;	ry = y - 1;	rz = 2;			break;		case 2:			lx = x - 1;	ly = y;		lz = 3;			tx = x;		ty = y;		tz = 0;			rx = x;		ry = y;		rz = 1;			break;		default:			lx = x;		ly = y;		lz = 2;			tx = x;		ty = y;		tz = 0;			rx = x;		ry = y;		rz = 1;	}	lpos = lx + ly * mb_width;	rpos = rx + ry * mb_width;	tpos = tx + ty * mb_width;	if (lx >= 0)	        pmv[1] = mbs[lpos].mvs[lz];	else 		pmv[1] = zeroMV;	if (ty >= 0) {		pmv[2] = mbs[tpos].mvs[tz];	} else		pmv[2] = zeroMV;    	if (ry >= 0 && rx < mb_width) {	        pmv[3] = mbs[rpos].mvs[rz];	} else {		pmv[3] = zeroMV;	}		/* set median */	pmv[0].vec.s16x =			MIN(MAX(pmv[1].vec.s16x, pmv[2].vec.s16x),				MIN(MAX(pmv[2].vec.s16x, pmv[3].vec.s16x), MAX(pmv[1].vec.s16x, pmv[3].vec.s16x)));	pmv[0].vec.s16y =			MIN(MAX(pmv[1].vec.s16y, pmv[2].vec.s16y),				MIN(MAX(pmv[2].vec.s16y, pmv[3].vec.s16y), MAX(pmv[1].vec.s16y, pmv[3].vec.s16y)));	return pmv[0];}#endif							/* _MBPREDICTION_H_ */