motion_est.c File Reference

Motion estimation. More...

#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include "avcodec.h"
#include "internal.h"
#include "mathops.h"
#include "motion_est.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "motion_est_template.c"

Classes
struct	Minima

Macros
#define	P_LEFT   P[1]
#define	P_TOP   P[2]
#define	P_TOPRIGHT   P[3]
#define	P_MEDIAN   P[4]
#define	P_MV1   P[9]
#define	ME_MAP_SHIFT   3
#define	ME_MAP_MV_BITS   11
#define	FLAG_QPEL   1
#define	FLAG_CHROMA   2
#define	FLAG_DIRECT   4
#define	CHECK_SAD_HALF_MV(suffix, x, y)
#define	HASH(fx, fy, bx, by)   ((fx)+17*(fy)+63*(bx)+117*(by))
#define	HASH8(fx, fy, bx, by)   ((uint8_t)HASH(fx,fy,bx,by))
#define	CHECK_BIDIR(fx, fy, bx, by)
#define	CHECK_BIDIR2(a, b, c, d)

Typedefs
typedef struct Minima	Minima

Functions
int	ff_init_me (MpegEncContext *s)
void	ff_estimate_p_frame_motion (MpegEncContext *s, int mb_x, int mb_y)
int	ff_pre_estimate_p_frame_motion (MpegEncContext *s, int mb_x, int mb_y)
void	ff_estimate_b_frame_motion (MpegEncContext *s, int mb_x, int mb_y)
int	ff_get_best_fcode (MpegEncContext *s, int16_t(*mv_table)[2], int type)
void	ff_fix_long_p_mvs (MpegEncContext *s)
void	ff_fix_long_mvs (MpegEncContext *s, uint8_t *field_select_table, int field_select, int16_t(*mv_table)[2], int f_code, int type, int truncate)

Detailed Description

Motion estimation.

Macro Definition Documentation

CHECK_BIDIR

#define CHECK_BIDIR	(		fx,
			fy,
			bx,
			by
	)

Value:

if( !map[(hashidx+HASH(fx,fy,bx,by))&255]\
       &&(fx<=0 || motion_fx+fx<=xmax) && (fy<=0 || motion_fy+fy<=ymax) && (bx<=0 || motion_bx+bx<=xmax) && (by<=0 || motion_by+by<=ymax)\
       &&(fx>=0 || motion_fx+fx>=xmin) && (fy>=0 || motion_fy+fy>=ymin) && (bx>=0 || motion_bx+bx>=xmin) && (by>=0 || motion_by+by>=ymin)){\
        int score;\
        map[(hashidx+HASH(fx,fy,bx,by))&255] = 1;\
        score= check_bidir_mv(s, motion_fx+fx, motion_fy+fy, motion_bx+bx, motion_by+by, pred_fx, pred_fy, pred_bx, pred_by, 0, 16);\
        if(score < fbmin){\
            hashidx += HASH(fx,fy,bx,by);\
            fbmin= score;\
            motion_fx+=fx;\
            motion_fy+=fy;\
            motion_bx+=bx;\
            motion_by+=by;\
            end=0;\
        }\
    }

CHECK_BIDIR2

#define CHECK_BIDIR2	(		a,
			b,
			c,
			d
	)

Value:

CHECK_BIDIR(a,b,c,d)\
CHECK_BIDIR(-(a),-(b),-(c),-(d))

CHECK_SAD_HALF_MV

#define CHECK_SAD_HALF_MV	(		suffix,
			x,
			y
	)

Value:

{\
    d  = s->mecc.pix_abs[size][(x ? 1 : 0) + (y ? 2 : 0)](NULL, pix, ptr + ((x) >> 1), stride, h); \
    d += (mv_penalty[pen_x + x] + mv_penalty[pen_y + y])*penalty_factor;\
    COPY3_IF_LT(dminh, d, dx, x, dy, y)\
}

Function Documentation

ff_estimate_p_frame_motion()

void ff_estimate_p_frame_motion	(	MpegEncContext *	s,
		int	mb_x,
		int	mb_y
	)

< the variance of the block (sum of squared (p[y][x]-average))

< sum of squared differences with the estimated motion vector

ff_fix_long_mvs()

void ff_fix_long_mvs	(	MpegEncContext *	s,
		uint8_t *	field_select_table,
		int	field_select,
		int16_t(*)	mv_table[2],
		int	f_code,
		int	type,
		int	truncate
	)

Parameters

truncate

1 for truncation, 0 for using intra