motion.h

mpeg4代码,比较具体

/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - Motion Estimation header -
 *
 *  Copyright(C) 2002 Christoph Lampert <[e-mail]>
 *
 *  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: motion.h,v 1.18 2002/11/26 23:44:10 edgomez Exp $
 *
 ***************************************************************************/

#ifndef _MOTION_H_
#define _MOTION_H_

#include "../portab.h"
#include "../global.h"

/* hard coded motion search parameters for motion_est */

/* very large value */
#define MV_MAX_ERROR	(4096 * 256)

/* stop search if sdelta < THRESHOLD */
#define MV16_THRESHOLD	192
#define MV8_THRESHOLD	56

#define NEIGH_MOVE_THRESH 0	
/* how much a block's MV must differ from his neighbour  */
/* to be search for INTER4V. The more, the faster... */

/* sad16(0,0) bias; mpeg4 spec suggests nb/2+1 */
/* nb  = vop pixels * 2^(bpp-8) */
#define MV16_00_BIAS	(128+1)
#define MV8_00_BIAS	(0)

/* INTER bias for INTER/INTRA decision; mpeg4 spec suggests 2*nb */
#define MV16_INTER_BIAS	512

/* Parameters which control inter/inter4v decision */
#define IMV16X16			5

/* vector map (vlc delta size) smoother parameters */
#define NEIGH_TEND_16X16	2
#define NEIGH_TEND_8X8		2

/* fast ((A)/2)*2 */
#define EVEN(A)		(((A)<0?(A)+1:(A)) & ~1)

#define MVzero(A) ( ((A).x)==(0) && ((A).y)==(0) )
#define MVequal(A,B) ( ((A).x)==((B).x) && ((A).y)==((B).y) )

/* default methods of Search, will be changed to function variable */

#ifndef SEARCH16
#define SEARCH16	PMVfastSearch16
/*#define SEARCH16  FullSearch16 */
/*#define SEARCH16  EPZSSearch16 */
#endif

#ifndef SEARCH8
#define SEARCH8		PMVfastSearch8
/*#define SEARCH8   EPZSSearch8 */
#endif


/*
 * Calculate the min/max range (in halfpixels)
 * relative to the _MACROBLOCK_ position
 */

static void __inline
get_range(int32_t * const min_dx,
		  int32_t * const max_dx,
		  int32_t * const min_dy,
		  int32_t * const max_dy,
		  const uint32_t x,
		  const uint32_t y,
		  const uint32_t block_sz,	/* block dimension, 8 or 16 */

		  const uint32_t width,
		  const uint32_t height,
		  const uint32_t fcode)
{

	const int search_range = 32 << (fcode - 1);
	const int high = search_range - 1;
	const int low = -search_range;

	/* convert full-pixel measurements to half pixel */
	const int hp_width = 2 * width;
	const int hp_height = 2 * height;
	const int hp_edge = 2 * block_sz;

	/* we need _right end_ of block, not x-coordinate */
	const int hp_x = 2 * (x) * block_sz;

	/* same for _bottom end_ */
	const int hp_y = 2 * (y) * block_sz;

	*max_dx = MIN(high, hp_width - hp_x);
	*max_dy = MIN(high, hp_height - hp_y);
	*min_dx = MAX(low, -(hp_edge + hp_x));
	*min_dy = MAX(low, -(hp_edge + hp_y));

}


/*
 * getref: calculate reference image pointer 
 * the decision to use interpolation h/v/hv or the normal image is
 * based on dx & dy.
 */

static __inline const uint8_t *
get_ref(const uint8_t * const refn,
		const uint8_t * const refh,
		const uint8_t * const refv,
		const uint8_t * const refhv,
		const uint32_t x,
		const uint32_t y,
		const uint32_t block,	/* block dimension, 8 or 16 */

		const int32_t dx,
		const int32_t dy,
		const uint32_t stride)
{


	switch (((dx & 1) << 1) + (dy & 1)) {	/* ((dx%2)?2:0)+((dy%2)?1:0) */
	case 0:
		return refn + (int) ((x * block + dx / 2) + (y * block + dy / 2) * stride);
	case 1:
		return refv + (int) ((x * block + dx / 2) + (y * block +
											  (dy - 1) / 2) * stride);
	case 2:
		return refh + (int) ((x * block + (dx - 1) / 2) + (y * block +
													dy / 2) * stride);
	default:
	case 3:
		return refhv + (int) ((x * block + (dx - 1) / 2) + (y * block +
													 (dy - 1) / 2) * stride);
	}

}


/* This is somehow a copy of get_ref, but with MV instead of X,Y */

static __inline const uint8_t *
get_ref_mv(const uint8_t * const refn,
		   const uint8_t * const refh,
		   const uint8_t * const refv,
		   const uint8_t * const refhv,
		   const uint32_t x,
		   const uint32_t y,
		   const uint32_t block,	/* block dimension, 8 or 16 */

		   const VECTOR * mv,	/* measured in half-pel! */

		   const uint32_t stride)
{

	switch ((((mv->x) & 1) << 1) + ((mv->y) & 1)) {
	case 0:
		return refn + (int) ((x * block + (mv->x) / 2) + (y * block +
												   (mv->y) / 2) * stride);
	case 1:
		return refv + (int) ((x * block + (mv->x) / 2) + (y * block +
												   ((mv->y) - 1) / 2) * stride);
	case 2:
		return refh + (int) ((x * block + ((mv->x) - 1) / 2) + (y * block +
														 (mv->y) / 2) * stride);
	default:
	case 3:
		return refhv + (int) ((x * block + ((mv->x) - 1) / 2) + (y * block +
														  ((mv->y) -
														   1) / 2) * stride);
	}

}


static __inline const uint8_t *
get_iref(const uint8_t * const ref,
		const uint32_t x,
		const uint32_t y,
		const uint32_t block,	/* block dimension, 8 or 16 */

		const int32_t dx,
		const int32_t dy,
		const uint32_t stride)
{
	return ref + (int) ((x * block + dx / 2) + (y * block + dy / 2) * stride);
}

static __inline const uint8_t *
get_iref_mv(const uint8_t * const ref,
		   const uint32_t x,
		   const uint32_t y,
		   const uint32_t block,	/* block dimension, 8 or 16 */

		   const VECTOR * mv,	/* as usual measured in half-pel */

		   const uint32_t stride)
{
	return ref + (int) ((x * block + (mv->x) / 2) + (y * block + (mv->y) / 2) * stride);
}


/* prototypes for MainSearch functions, i.e. Diamondsearch, FullSearch or whatever */

typedef int32_t(MainSearch16Func) (const uint8_t * const pRef,
								   const uint8_t * const pRefH,
								   const uint8_t * const pRefV,
								   const uint8_t * const pRefHV,
								   const uint8_t * const cur,
								   const int x,
								   const int y,
								   const int start_x,
								   const int start_y,
								   int iMinSAD,
								   VECTOR * const currMV,
								   const int center_x,
								   const int center_y,
								   const int32_t min_dx,
								   const int32_t max_dx,
								   const int32_t min_dy,
								   const int32_t max_dy,
								   const int32_t iEdgedWidth,
								   const int32_t iDiamondSize,
								   const int32_t iFcode,
								   const int32_t iQuant,
								   int iFound);

typedef MainSearch16Func *MainSearch16FuncPtr;


typedef int32_t(MainSearch8Func) (const uint8_t * const pRef,
								  const uint8_t * const pRefH,
								  const uint8_t * const pRefV,
								  const uint8_t * const pRefHV,
								  const uint8_t * const cur,
								  const int x,
								  const int y,
								   const int start_x,
								   const int start_y,
								   int iMinSAD,
								   VECTOR * const currMV,
								   const int center_x,
								   const int center_y,
								  const int32_t min_dx,
								  const int32_t max_dx,
								  const int32_t min_dy,
								  const int32_t max_dy,
								  const int32_t iEdgedWidth,
								  const int32_t iDiamondSize,
								  const int32_t iFcode,
								  const int32_t iQuant,
								  int iFound);

typedef MainSearch8Func *MainSearch8FuncPtr;


/* prototypes for MotionEstimation functions, i.e. PMVfast, EPZS or whatever */

typedef int32_t(Search16Func) (	const uint8_t * const pRef,
								const uint8_t * const pRefH,
								const uint8_t * const pRefV,
								const uint8_t * const pRefHV,
								const IMAGE * const pCur,
								const int x,
								const int y,
								const int start_x,
								const int start_y,
								const int center_x,
								const int center_y,
								const uint32_t MotionFlags,
								const uint32_t iQuant,
								const uint32_t iFcode,
								const MBParam * const pParam,
								const MACROBLOCK * const pMBs,
								const MACROBLOCK * const prevMBs,
								VECTOR * const currMV,
								VECTOR * const currPMV);

typedef Search16Func *Search16FuncPtr;

typedef int32_t(Search8Func) (	const uint8_t * const pRef,
								const uint8_t * const pRefH,
								const uint8_t * const pRefV,
								const uint8_t * const pRefHV,
								const IMAGE * const pCur,
								const int x,
								const int y,
								const int start_x,
								const int start_y,
								const int center_x,
								const int center_y,
								const uint32_t MotionFlags,
								const uint32_t iQuant,
								const uint32_t iFcode,
								const MBParam * const pParam,
								const MACROBLOCK * const pMBs,
								const MACROBLOCK * const prevMBs,
								VECTOR * const currMV,
								VECTOR * const currPMV);

typedef Search8Func *Search8FuncPtr;

Search16Func PMVfastSearch16;
Search16Func EPZSSearch16;
Search16Func PMVfastIntSearch16;

Search8Func	PMVfastSearch8;
Search8Func	EPZSSearch8;


bool
MotionEstimation(MBParam * const pParam,
				 FRAMEINFO * const current,
				 FRAMEINFO * const reference,
				 const IMAGE * const pRefH,
				 const IMAGE * const pRefV,
				 const IMAGE * const pRefHV,
				 const uint32_t iLimit);

typedef int32_t(Halfpel8_RefineFunc) (const uint8_t * const pRef,
				      const uint8_t * const pRefH,
				      const uint8_t * const pRefV,
				      const uint8_t * const pRefHV,
				      const uint8_t * const cur,
				      const int x,
				      const int y,
				      VECTOR * const currMV,
				      int32_t iMinSAD,
					   const int center_x,
					   const int center_y,
				      const int32_t min_dx,
				      const int32_t max_dx,
				      const int32_t min_dy,
				      const int32_t max_dy,
				      const int32_t iFcode,
				      const int32_t iQuant,
				      const int32_t iEdgedWidth);

typedef Halfpel8_RefineFunc *Halfpel8_RefineFuncPtr;
extern Halfpel8_RefineFuncPtr Halfpel8_Refine;
Halfpel8_RefineFunc Halfpel8_Refine_c;
Halfpel8_RefineFunc Halfpel8_Refine_ia64;


#endif							/* _MOTION_H_ */