/*

  * Motion estimation

  * Copyright (c) 2000,2001 Fabrice Bellard

  * Copyright (c) 2002-2004 Michael Niedermayer

  *

  * new motion estimation (X1/EPZS) by Michael Niedermayer <michaelni@gmx.at>

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg 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
  * Lesser General Public License for more details.

  *

  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 /**

  * @file

  * Motion estimation.
  */

 #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"
 

 #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
 

 static int sad_hpel_motion_search(MpegEncContext * s,

                                   int *mx_ptr, int *my_ptr, int dmin,

                                   int src_index, int ref_index,
                                   int size, int h);

 static inline unsigned update_map_generation(MotionEstContext *c)

 {

     c->map_generation+= 1<<(ME_MAP_MV_BITS*2);
     if(c->map_generation==0){
         c->map_generation= 1<<(ME_MAP_MV_BITS*2);
         memset(c->map, 0, sizeof(uint32_t)*ME_MAP_SIZE);

     }

     return c->map_generation;

 }
 

 /* shape adaptive search stuff */
 typedef struct Minima{
     int height;
     int x, y;
     int checked;
 }Minima;

 static int minima_cmp(const void *a, const void *b){

     const Minima *da = (const Minima *) a;
     const Minima *db = (const Minima *) b;

     return da->height - db->height;
 }

 #define FLAG_QPEL   1 //must be 1
 #define FLAG_CHROMA 2
 #define FLAG_DIRECT 4

 static inline void init_ref(MotionEstContext *c, uint8_t *src[3], uint8_t *ref[3], uint8_t *ref2[3], int x, int y, int ref_index){

     const int offset[3]= {
           y*c->  stride + x,
         ((y*c->uvstride + x)>>1),
         ((y*c->uvstride + x)>>1),
     };
     int i;
     for(i=0; i<3; i++){
         c->src[0][i]= src [i] + offset[i];
         c->ref[0][i]= ref [i] + offset[i];
     }
     if(ref_index){
         for(i=0; i<3; i++){
             c->ref[ref_index][i]= ref2[i] + offset[i];
         }
     }

 }
 

 static int get_flags(MotionEstContext *c, int direct, int chroma){

     return   ((c->avctx->flags&AV_CODEC_FLAG_QPEL) ? FLAG_QPEL : 0)

            + (direct ? FLAG_DIRECT : 0)

            + (chroma ? FLAG_CHROMA : 0);

 }
 

 static av_always_inline int cmp_direct_inline(MpegEncContext *s, const int x, const int y, const int subx, const int suby,

                       const int size, const int h, int ref_index, int src_index,

                       me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, int qpel){

     MotionEstContext * const c= &s->me;
     const int stride= c->stride;
     const int hx= subx + (x<<(1+qpel));
     const int hy= suby + (y<<(1+qpel));
     uint8_t * const * const ref= c->ref[ref_index];
     uint8_t * const * const src= c->src[src_index];
     int d;
     //FIXME check chroma 4mv, (no crashes ...)

         av_assert2(x >= c->xmin && hx <= c->xmax<<(qpel+1) && y >= c->ymin && hy <= c->ymax<<(qpel+1));

         if(x >= c->xmin && hx <= c->xmax<<(qpel+1) && y >= c->ymin && hy <= c->ymax<<(qpel+1)){
             const int time_pp= s->pp_time;
             const int time_pb= s->pb_time;
             const int mask= 2*qpel+1;
             if(s->mv_type==MV_TYPE_8X8){
                 int i;
                 for(i=0; i<4; i++){
                     int fx = c->direct_basis_mv[i][0] + hx;
                     int fy = c->direct_basis_mv[i][1] + hy;
                     int bx = hx ? fx - c->co_located_mv[i][0] : c->co_located_mv[i][0]*(time_pb - time_pp)/time_pp + ((i &1)<<(qpel+4));
                     int by = hy ? fy - c->co_located_mv[i][1] : c->co_located_mv[i][1]*(time_pb - time_pp)/time_pp + ((i>>1)<<(qpel+4));
                     int fxy= (fx&mask) + ((fy&mask)<<(qpel+1));
                     int bxy= (bx&mask) + ((by&mask)<<(qpel+1));

                     uint8_t *dst= c->temp + 8*(i&1) + 8*stride*(i>>1);
                     if(qpel){
                         c->qpel_put[1][fxy](dst, ref[0] + (fx>>2) + (fy>>2)*stride, stride);
                         c->qpel_avg[1][bxy](dst, ref[8] + (bx>>2) + (by>>2)*stride, stride);
                     }else{
                         c->hpel_put[1][fxy](dst, ref[0] + (fx>>1) + (fy>>1)*stride, stride, 8);
                         c->hpel_avg[1][bxy](dst, ref[8] + (bx>>1) + (by>>1)*stride, stride, 8);
                     }
                 }
             }else{
                 int fx = c->direct_basis_mv[0][0] + hx;
                 int fy = c->direct_basis_mv[0][1] + hy;
                 int bx = hx ? fx - c->co_located_mv[0][0] : (c->co_located_mv[0][0]*(time_pb - time_pp)/time_pp);
                 int by = hy ? fy - c->co_located_mv[0][1] : (c->co_located_mv[0][1]*(time_pb - time_pp)/time_pp);
                 int fxy= (fx&mask) + ((fy&mask)<<(qpel+1));
                 int bxy= (bx&mask) + ((by&mask)<<(qpel+1));

                 if(qpel){
                     c->qpel_put[1][fxy](c->temp               , ref[0] + (fx>>2) + (fy>>2)*stride               , stride);
                     c->qpel_put[1][fxy](c->temp + 8           , ref[0] + (fx>>2) + (fy>>2)*stride + 8           , stride);
                     c->qpel_put[1][fxy](c->temp     + 8*stride, ref[0] + (fx>>2) + (fy>>2)*stride     + 8*stride, stride);
                     c->qpel_put[1][fxy](c->temp + 8 + 8*stride, ref[0] + (fx>>2) + (fy>>2)*stride + 8 + 8*stride, stride);
                     c->qpel_avg[1][bxy](c->temp               , ref[8] + (bx>>2) + (by>>2)*stride               , stride);
                     c->qpel_avg[1][bxy](c->temp + 8           , ref[8] + (bx>>2) + (by>>2)*stride + 8           , stride);
                     c->qpel_avg[1][bxy](c->temp     + 8*stride, ref[8] + (bx>>2) + (by>>2)*stride     + 8*stride, stride);
                     c->qpel_avg[1][bxy](c->temp + 8 + 8*stride, ref[8] + (bx>>2) + (by>>2)*stride + 8 + 8*stride, stride);

                 }else{

                     av_assert2((fx>>1) + 16*s->mb_x >= -16);
                     av_assert2((fy>>1) + 16*s->mb_y >= -16);
                     av_assert2((fx>>1) + 16*s->mb_x <= s->width);
                     av_assert2((fy>>1) + 16*s->mb_y <= s->height);
                     av_assert2((bx>>1) + 16*s->mb_x >= -16);
                     av_assert2((by>>1) + 16*s->mb_y >= -16);
                     av_assert2((bx>>1) + 16*s->mb_x <= s->width);
                     av_assert2((by>>1) + 16*s->mb_y <= s->height);

 
                     c->hpel_put[0][fxy](c->temp, ref[0] + (fx>>1) + (fy>>1)*stride, stride, 16);
                     c->hpel_avg[0][bxy](c->temp, ref[8] + (bx>>1) + (by>>1)*stride, stride, 16);
                 }
             }
             d = cmp_func(s, c->temp, src[0], stride, 16);
         }else
             d= 256*256*256*32;

     return d;
 }
 
 static av_always_inline int cmp_inline(MpegEncContext *s, const int x, const int y, const int subx, const int suby,
                       const int size, const int h, int ref_index, int src_index,
                       me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, int qpel, int chroma){
     MotionEstContext * const c= &s->me;
     const int stride= c->stride;
     const int uvstride= c->uvstride;
     const int dxy= subx + (suby<<(1+qpel)); //FIXME log2_subpel?

     const int hx= subx + x*(1<<(1+qpel));
     const int hy= suby + y*(1<<(1+qpel));

     uint8_t * const * const ref= c->ref[ref_index];
     uint8_t * const * const src= c->src[src_index];
     int d;
     //FIXME check chroma 4mv, (no crashes ...)

         int uvdxy;              /* no, it might not be used uninitialized */

         if(dxy){
             if(qpel){

                 if (h << size == 16) {
                     c->qpel_put[size][dxy](c->temp, ref[0] + x + y*stride, stride); //FIXME prototype (add h)
                 } else if (size == 0 && h == 8) {
                     c->qpel_put[1][dxy](c->temp    , ref[0] + x + y*stride    , stride);
                     c->qpel_put[1][dxy](c->temp + 8, ref[0] + x + y*stride + 8, stride);
                 } else
                     av_assert2(0);

                 if(chroma){
                     int cx= hx/2;
                     int cy= hy/2;
                     cx= (cx>>1)|(cx&1);
                     cy= (cy>>1)|(cy&1);
                     uvdxy= (cx&1) + 2*(cy&1);

                     // FIXME x/y wrong, but MPEG-4 qpel is sick anyway, we should drop as much of it as possible in favor for H.264

                 }
             }else{
                 c->hpel_put[size][dxy](c->temp, ref[0] + x + y*stride, stride, h);
                 if(chroma)
                     uvdxy= dxy | (x&1) | (2*(y&1));
             }

             d = cmp_func(s, c->temp, src[0], stride, h);

         }else{

             d = cmp_func(s, src[0], ref[0] + x + y*stride, stride, h);

             if(chroma)
                 uvdxy= (x&1) + 2*(y&1);
         }
         if(chroma){
             uint8_t * const uvtemp= c->temp + 16*stride;
             c->hpel_put[size+1][uvdxy](uvtemp  , ref[1] + (x>>1) + (y>>1)*uvstride, uvstride, h>>1);
             c->hpel_put[size+1][uvdxy](uvtemp+8, ref[2] + (x>>1) + (y>>1)*uvstride, uvstride, h>>1);

             d += chroma_cmp_func(s, uvtemp  , src[1], uvstride, h>>1);
             d += chroma_cmp_func(s, uvtemp+8, src[2], uvstride, h>>1);

         }

     return d;
 }
 
 static int cmp_simple(MpegEncContext *s, const int x, const int y,
                       int ref_index, int src_index,
                       me_cmp_func cmp_func, me_cmp_func chroma_cmp_func){
     return cmp_inline(s,x,y,0,0,0,16,ref_index,src_index, cmp_func, chroma_cmp_func, 0, 0);
 }
 
 static int cmp_fpel_internal(MpegEncContext *s, const int x, const int y,
                       const int size, const int h, int ref_index, int src_index,
                       me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, const int flags){
     if(flags&FLAG_DIRECT){
         return cmp_direct_inline(s,x,y,0,0,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, flags&FLAG_QPEL);
     }else{
         return cmp_inline(s,x,y,0,0,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, 0, flags&FLAG_CHROMA);

     }

 }
 
 static int cmp_internal(MpegEncContext *s, const int x, const int y, const int subx, const int suby,
                       const int size, const int h, int ref_index, int src_index,
                       me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, const int flags){
     if(flags&FLAG_DIRECT){
         return cmp_direct_inline(s,x,y,subx,suby,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, flags&FLAG_QPEL);
     }else{
         return cmp_inline(s,x,y,subx,suby,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, flags&FLAG_QPEL, flags&FLAG_CHROMA);

     }

 }

 /** @brief compares a block (either a full macroblock or a partition thereof)

     against a proposed motion-compensated prediction of that block
  */

 static av_always_inline int cmp(MpegEncContext *s, const int x, const int y, const int subx, const int suby,
                       const int size, const int h, int ref_index, int src_index,
                       me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, const int flags){
     if(av_builtin_constant_p(flags) && av_builtin_constant_p(h) && av_builtin_constant_p(size)
        && av_builtin_constant_p(subx) && av_builtin_constant_p(suby)
        && flags==0 && h==16 && size==0 && subx==0 && suby==0){
         return cmp_simple(s,x,y,ref_index,src_index, cmp_func, chroma_cmp_func);
     }else if(av_builtin_constant_p(subx) && av_builtin_constant_p(suby)
        && subx==0 && suby==0){
         return cmp_fpel_internal(s,x,y,size,h,ref_index,src_index, cmp_func, chroma_cmp_func,flags);
     }else{
         return cmp_internal(s,x,y,subx,suby,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, flags);
     }
 }
 
 static int cmp_hpel(MpegEncContext *s, const int x, const int y, const int subx, const int suby,
                       const int size, const int h, int ref_index, int src_index,
                       me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, const int flags){
     if(flags&FLAG_DIRECT){
         return cmp_direct_inline(s,x,y,subx,suby,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, 0);
     }else{
         return cmp_inline(s,x,y,subx,suby,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, 0, flags&FLAG_CHROMA);
     }
 }
 
 static int cmp_qpel(MpegEncContext *s, const int x, const int y, const int subx, const int suby,
                       const int size, const int h, int ref_index, int src_index,
                       me_cmp_func cmp_func, me_cmp_func chroma_cmp_func, const int flags){
     if(flags&FLAG_DIRECT){
         return cmp_direct_inline(s,x,y,subx,suby,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, 1);
     }else{
         return cmp_inline(s,x,y,subx,suby,size,h,ref_index,src_index, cmp_func, chroma_cmp_func, 1, flags&FLAG_CHROMA);
     }

 }

 
 #include "motion_est_template.c"
 

 static int zero_cmp(MpegEncContext *s, uint8_t *a, uint8_t *b,

                     ptrdiff_t stride, int h)

 {

     return 0;
 }
 

 static void zero_hpel(uint8_t *a, const uint8_t *b, ptrdiff_t stride, int h){

 }
 

 int ff_init_me(MpegEncContext *s){

     MotionEstContext * const c= &s->me;

     int cache_size= FFMIN(ME_MAP_SIZE>>ME_MAP_SHIFT, 1<<ME_MAP_SHIFT);
     int dia_size= FFMAX(FFABS(s->avctx->dia_size)&255, FFABS(s->avctx->pre_dia_size)&255);

     if(FFMIN(s->avctx->dia_size, s->avctx->pre_dia_size) < -FFMIN(ME_MAP_SIZE, MAX_SAB_SIZE)){

         av_log(s->avctx, AV_LOG_ERROR, "ME_MAP size is too small for SAB diamond\n");
         return -1;
     }

 
 #if FF_API_MOTION_EST

     //special case of snow is needed because snow uses its own iterative ME code

 FF_DISABLE_DEPRECATION_WARNINGS
     if (s->motion_est == FF_ME_EPZS) {
         if (s->me_method == ME_ZERO)
             s->motion_est = FF_ME_ZERO;
         else if (s->me_method == ME_EPZS)
             s->motion_est = FF_ME_EPZS;
         else if (s->me_method == ME_X1)
             s->motion_est = FF_ME_XONE;

         else if (s->avctx->codec_id != AV_CODEC_ID_SNOW) {

             av_log(s->avctx, AV_LOG_ERROR,
                    "me_method is only allowed to be set to zero and epzs; "
                    "for hex,umh,full and others see dia_size\n");
             return -1;
         }

     }

 FF_ENABLE_DEPRECATION_WARNINGS
 #endif

     c->avctx= s->avctx;

     if(s->codec_id == AV_CODEC_ID_H261)
         c->avctx->me_sub_cmp = c->avctx->me_cmp;
 

     if(cache_size < 2*dia_size && !c->stride){
         av_log(s->avctx, AV_LOG_INFO, "ME_MAP size may be a little small for the selected diamond size\n");
     }

     ff_set_cmp(&s->mecc, s->mecc.me_pre_cmp, c->avctx->me_pre_cmp);
     ff_set_cmp(&s->mecc, s->mecc.me_cmp,     c->avctx->me_cmp);
     ff_set_cmp(&s->mecc, s->mecc.me_sub_cmp, c->avctx->me_sub_cmp);
     ff_set_cmp(&s->mecc, s->mecc.mb_cmp,     c->avctx->mb_cmp);

     c->flags    = get_flags(c, 0, c->avctx->me_cmp    &FF_CMP_CHROMA);
     c->sub_flags= get_flags(c, 0, c->avctx->me_sub_cmp&FF_CMP_CHROMA);
     c->mb_flags = get_flags(c, 0, c->avctx->mb_cmp    &FF_CMP_CHROMA);

 /*FIXME s->no_rounding b_type*/

     if (s->avctx->flags & AV_CODEC_FLAG_QPEL) {

         c->sub_motion_search= qpel_motion_search;

         c->qpel_avg = s->qdsp.avg_qpel_pixels_tab;
         if (s->no_rounding)
             c->qpel_put = s->qdsp.put_no_rnd_qpel_pixels_tab;
         else
             c->qpel_put = s->qdsp.put_qpel_pixels_tab;

     }else{

         if(c->avctx->me_sub_cmp&FF_CMP_CHROMA)

             c->sub_motion_search= hpel_motion_search;

         else if(   c->avctx->me_sub_cmp == FF_CMP_SAD
                 && c->avctx->    me_cmp == FF_CMP_SAD

                 && c->avctx->    mb_cmp == FF_CMP_SAD)

             c->sub_motion_search= sad_hpel_motion_search; // 2050 vs. 2450 cycles

         else

             c->sub_motion_search= hpel_motion_search;

     }

     c->hpel_avg = s->hdsp.avg_pixels_tab;
     if (s->no_rounding)
         c->hpel_put = s->hdsp.put_no_rnd_pixels_tab;
     else
         c->hpel_put = s->hdsp.put_pixels_tab;

     if(s->linesize){

         c->stride  = s->linesize;

         c->uvstride= s->uvlinesize;

     }else{

         c->stride  = 16*s->mb_width + 32;
         c->uvstride=  8*s->mb_width + 16;

     }

     /* 8x8 fullpel search would need a 4x4 chroma compare, which we do
      * not have yet, and even if we had, the motion estimation code
      * does not expect it. */

     if (s->codec_id != AV_CODEC_ID_SNOW) {
         if ((c->avctx->me_cmp & FF_CMP_CHROMA) /* && !s->mecc.me_cmp[2] */)
             s->mecc.me_cmp[2] = zero_cmp;
         if ((c->avctx->me_sub_cmp & FF_CMP_CHROMA) && !s->mecc.me_sub_cmp[2])
             s->mecc.me_sub_cmp[2] = zero_cmp;

         c->hpel_put[2][0]= c->hpel_put[2][1]=
         c->hpel_put[2][2]= c->hpel_put[2][3]= zero_hpel;

     }
 

     if(s->codec_id == AV_CODEC_ID_H261){

         c->sub_motion_search= no_sub_motion_search;
     }
 

     return 0;

 }

 #define CHECK_SAD_HALF_MV(suffix, x, y) \

 {\

     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)\
 }

 static int sad_hpel_motion_search(MpegEncContext * s,

                                   int *mx_ptr, int *my_ptr, int dmin,

                                   int src_index, int ref_index,
                                   int size, int h)

 {

     MotionEstContext * const c= &s->me;
     const int penalty_factor= c->sub_penalty_factor;

     int mx, my, dminh;

     uint8_t *pix, *ptr;

     int stride= c->stride;

     LOAD_COMMON

     av_assert2(c->sub_flags == 0);

     if(c->skip){

         *mx_ptr = 0;
         *my_ptr = 0;
         return dmin;
     }

     pix = c->src[src_index][0];

     mx = *mx_ptr;
     my = *my_ptr;

     ptr = c->ref[ref_index][0] + (my * stride) + mx;

     dminh = dmin;
 

     if (mx > xmin && mx < xmax &&

         my > ymin && my < ymax) {

         int dx=0, dy=0;

         int d, pen_x, pen_y;

         const int index= my*(1<<ME_MAP_SHIFT) + mx;

         const int t= score_map[(index-(1<<ME_MAP_SHIFT))&(ME_MAP_SIZE-1)];
         const int l= score_map[(index- 1               )&(ME_MAP_SIZE-1)];
         const int r= score_map[(index+ 1               )&(ME_MAP_SIZE-1)];
         const int b= score_map[(index+(1<<ME_MAP_SHIFT))&(ME_MAP_SIZE-1)];

         mx += mx;
         my += my;

         pen_x= pred_x + mx;
         pen_y= pred_y + my;
 

         ptr-= stride;

         if(t<=b){

             CHECK_SAD_HALF_MV(y2 , 0, -1)

             if(l<=r){

                 CHECK_SAD_HALF_MV(xy2, -1, -1)

                 if(t+r<=b+l){

                     CHECK_SAD_HALF_MV(xy2, +1, -1)

                     ptr+= stride;

                 }else{

                     ptr+= stride;

                     CHECK_SAD_HALF_MV(xy2, -1, +1)

                 }

                 CHECK_SAD_HALF_MV(x2 , -1,  0)

             }else{

                 CHECK_SAD_HALF_MV(xy2, +1, -1)

                 if(t+l<=b+r){

                     CHECK_SAD_HALF_MV(xy2, -1, -1)

                     ptr+= stride;

                 }else{

                     ptr+= stride;

                     CHECK_SAD_HALF_MV(xy2, +1, +1)

                 }

                 CHECK_SAD_HALF_MV(x2 , +1,  0)

             }
         }else{
             if(l<=r){
                 if(t+l<=b+r){

                     CHECK_SAD_HALF_MV(xy2, -1, -1)

                     ptr+= stride;

                 }else{

                     ptr+= stride;

                     CHECK_SAD_HALF_MV(xy2, +1, +1)

                 }

                 CHECK_SAD_HALF_MV(x2 , -1,  0)
                 CHECK_SAD_HALF_MV(xy2, -1, +1)

             }else{
                 if(t+r<=b+l){

                     CHECK_SAD_HALF_MV(xy2, +1, -1)

                     ptr+= stride;

                 }else{

                     ptr+= stride;

                     CHECK_SAD_HALF_MV(xy2, -1, +1)

                 }

                 CHECK_SAD_HALF_MV(x2 , +1,  0)
                 CHECK_SAD_HALF_MV(xy2, +1, +1)

             }

             CHECK_SAD_HALF_MV(y2 ,  0, +1)

         }
         mx+=dx;
         my+=dy;

 
     }else{

         mx += mx;
         my += my;

     }
 
     *mx_ptr = mx;
     *my_ptr = my;

     return dminh;

 }
 

 static inline void set_p_mv_tables(MpegEncContext * s, int mx, int my, int mv4)

 {

     const int xy= s->mb_x + s->mb_y*s->mb_stride;

     s->p_mv_table[xy][0] = mx;
     s->p_mv_table[xy][1] = my;

     /* has already been set to the 4 MV if 4MV is done */

     if(mv4){

         int mot_xy= s->block_index[0];
 

         s->current_picture.motion_val[0][mot_xy    ][0] = mx;
         s->current_picture.motion_val[0][mot_xy    ][1] = my;
         s->current_picture.motion_val[0][mot_xy + 1][0] = mx;
         s->current_picture.motion_val[0][mot_xy + 1][1] = my;

         mot_xy += s->b8_stride;

         s->current_picture.motion_val[0][mot_xy    ][0] = mx;
         s->current_picture.motion_val[0][mot_xy    ][1] = my;
         s->current_picture.motion_val[0][mot_xy + 1][0] = mx;
         s->current_picture.motion_val[0][mot_xy + 1][1] = my;

     }
 }
 

 /**
  * get fullpel ME search limits.
  */

 static inline void get_limits(MpegEncContext *s, int x, int y)

 {

     MotionEstContext * const c= &s->me;

     int range= c->avctx->me_range >> (1 + !!(c->flags&FLAG_QPEL));

     int max_range = MAX_MV >> (1 + !!(c->flags&FLAG_QPEL));

 /*

     if(c->avctx->me_range) c->range= c->avctx->me_range >> 1;

     else                   c->range= 16;

 */

     if (s->unrestricted_mv) {

         c->xmin = - x - 16;
         c->ymin = - y - 16;

         c->xmax = - x + s->width;
         c->ymax = - y + s->height;

     } else if (s->out_format == FMT_H261){

         // Search range of H.261 is different from other codec standards

         c->xmin = (x > 15) ? - 15 : 0;
         c->ymin = (y > 15) ? - 15 : 0;

         c->xmax = (x < s->mb_width * 16 - 16) ? 15 : 0;

         c->ymax = (y < s->mb_height * 16 - 16) ? 15 : 0;

     } else {

         c->xmin = - x;
         c->ymin = - y;
         c->xmax = - x + s->mb_width *16 - 16;
         c->ymax = - y + s->mb_height*16 - 16;

     }

     if(!range || range > max_range)
         range = max_range;

     if(range){
         c->xmin = FFMAX(c->xmin,-range);
         c->xmax = FFMIN(c->xmax, range);
         c->ymin = FFMAX(c->ymin,-range);
         c->ymax = FFMIN(c->ymax, range);
     }

 }
 

 static inline void init_mv4_ref(MotionEstContext *c){
     const int stride= c->stride;

 
     c->ref[1][0] = c->ref[0][0] + 8;
     c->ref[2][0] = c->ref[0][0] + 8*stride;
     c->ref[3][0] = c->ref[2][0] + 8;
     c->src[1][0] = c->src[0][0] + 8;
     c->src[2][0] = c->src[0][0] + 8*stride;
     c->src[3][0] = c->src[2][0] + 8;
 }
 

 static inline int h263_mv4_search(MpegEncContext *s, int mx, int my, int shift)

 {

     MotionEstContext * const c= &s->me;

     const int size= 1;
     const int h=8;

     int block;
     int P[10][2];

     int dmin_sum=0, mx4_sum=0, my4_sum=0, i;

     int same=1;

     const int stride= c->stride;

     uint8_t *mv_penalty= c->current_mv_penalty;

     int safety_clipping= s->unrestricted_mv && (s->width&15) && (s->height&15);

     init_mv4_ref(c);

     for(block=0; block<4; block++){
         int mx4, my4;
         int pred_x4, pred_y4;
         int dmin4;
         static const int off[4]= {2, 1, 1, -1};

         const int mot_stride = s->b8_stride;

         const int mot_xy = s->block_index[block];

         if(safety_clipping){

             c->xmax = - 16*s->mb_x + s->width  - 8*(block &1);
             c->ymax = - 16*s->mb_y + s->height - 8*(block>>1);
         }
 

         P_LEFT[0] = s->current_picture.motion_val[0][mot_xy - 1][0];
         P_LEFT[1] = s->current_picture.motion_val[0][mot_xy - 1][1];

         if(P_LEFT[0]       > (c->xmax<<shift)) P_LEFT[0]       = (c->xmax<<shift);

 
         /* special case for first line */

         if (s->first_slice_line && block<2) {

             c->pred_x= pred_x4= P_LEFT[0];
             c->pred_y= pred_y4= P_LEFT[1];

         } else {

             P_TOP[0]      = s->current_picture.motion_val[0][mot_xy - mot_stride             ][0];
             P_TOP[1]      = s->current_picture.motion_val[0][mot_xy - mot_stride             ][1];
             P_TOPRIGHT[0] = s->current_picture.motion_val[0][mot_xy - mot_stride + off[block]][0];
             P_TOPRIGHT[1] = s->current_picture.motion_val[0][mot_xy - mot_stride + off[block]][1];

             if(P_TOP[1]      > (c->ymax<<shift)) P_TOP[1]     = (c->ymax<<shift);
             if(P_TOPRIGHT[0] < (c->xmin<<shift)) P_TOPRIGHT[0]= (c->xmin<<shift);
             if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift);
             if(P_TOPRIGHT[1] > (c->ymax<<shift)) P_TOPRIGHT[1]= (c->ymax<<shift);

             P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
             P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
 

             c->pred_x= pred_x4 = P_MEDIAN[0];
             c->pred_y= pred_y4 = P_MEDIAN[1];

         }
         P_MV1[0]= mx;
         P_MV1[1]= my;

         if(safety_clipping)

             for(i=1; i<10; i++){
                 if (s->first_slice_line && block<2 && i>1 && i<9)
                     continue;
                 if (i>4 && i<9)
                     continue;

                 if(P[i][0] > (c->xmax<<shift)) P[i][0]= (c->xmax<<shift);
                 if(P[i][1] > (c->ymax<<shift)) P[i][1]= (c->ymax<<shift);
             }

         dmin4 = epzs_motion_search4(s, &mx4, &my4, P, block, block, s->p_mv_table, (1<<16)>>shift);

         dmin4= c->sub_motion_search(s, &mx4, &my4, dmin4, block, block, size, h);

         if (s->mecc.me_sub_cmp[0] != s->mecc.mb_cmp[0]) {

             int dxy;

             const int offset= ((block&1) + (block>>1)*stride)*8;

             uint8_t *dest_y = c->scratchpad + offset;

             if(s->quarter_sample){

                 uint8_t *ref= c->ref[block][0] + (mx4>>2) + (my4>>2)*stride;

                 dxy = ((my4 & 3) << 2) | (mx4 & 3);
 
                 if(s->no_rounding)

                     s->qdsp.put_no_rnd_qpel_pixels_tab[1][dxy](dest_y, ref, stride);

                 else

                     s->qdsp.put_qpel_pixels_tab[1][dxy](dest_y, ref, stride);

             }else{

                 uint8_t *ref= c->ref[block][0] + (mx4>>1) + (my4>>1)*stride;

                 dxy = ((my4 & 1) << 1) | (mx4 & 1);
 
                 if(s->no_rounding)

                     s->hdsp.put_no_rnd_pixels_tab[1][dxy](dest_y    , ref    , stride, h);

                 else

                     s->hdsp.put_pixels_tab       [1][dxy](dest_y    , ref    , stride, h);

             }

             dmin_sum+= (mv_penalty[mx4-pred_x4] + mv_penalty[my4-pred_y4])*c->mb_penalty_factor;

         }else
             dmin_sum+= dmin4;
 
         if(s->quarter_sample){
             mx4_sum+= mx4/2;
             my4_sum+= my4/2;
         }else{
             mx4_sum+= mx4;
             my4_sum+= my4;
         }

         s->current_picture.motion_val[0][s->block_index[block]][0] = mx4;
         s->current_picture.motion_val[0][s->block_index[block]][1] = my4;

 
         if(mx4 != mx || my4 != my) same=0;

     }

     if(same)
         return INT_MAX;

     if (s->mecc.me_sub_cmp[0] != s->mecc.mb_cmp[0]) {
         dmin_sum += s->mecc.mb_cmp[0](s,
                                       s->new_picture.f->data[0] +
                                       s->mb_x * 16 + s->mb_y * 16 * stride,
                                       c->scratchpad, stride, 16);

     }

     if(c->avctx->mb_cmp&FF_CMP_CHROMA){

         int dxy;
         int mx, my;
         int offset;
 
         mx= ff_h263_round_chroma(mx4_sum);
         my= ff_h263_round_chroma(my4_sum);
         dxy = ((my & 1) << 1) | (mx & 1);

         offset= (s->mb_x*8 + (mx>>1)) + (s->mb_y*8 + (my>>1))*s->uvlinesize;

         if(s->no_rounding){

             s->hdsp.put_no_rnd_pixels_tab[1][dxy](c->scratchpad    , s->last_picture.f->data[1] + offset, s->uvlinesize, 8);
             s->hdsp.put_no_rnd_pixels_tab[1][dxy](c->scratchpad + 8, s->last_picture.f->data[2] + offset, s->uvlinesize, 8);

         }else{

             s->hdsp.put_pixels_tab       [1][dxy](c->scratchpad    , s->last_picture.f->data[1] + offset, s->uvlinesize, 8);
             s->hdsp.put_pixels_tab       [1][dxy](c->scratchpad + 8, s->last_picture.f->data[2] + offset, s->uvlinesize, 8);

         }
 

         dmin_sum += s->mecc.mb_cmp[1](s, s->new_picture.f->data[1] + s->mb_x * 8 + s->mb_y * 8 * s->uvlinesize, c->scratchpad,     s->uvlinesize, 8);
         dmin_sum += s->mecc.mb_cmp[1](s, s->new_picture.f->data[2] + s->mb_x * 8 + s->mb_y * 8 * s->uvlinesize, c->scratchpad + 8, s->uvlinesize, 8);

     }

     c->pred_x= mx;
     c->pred_y= my;

     switch(c->avctx->mb_cmp&0xFF){

     /*case FF_CMP_SSE:
         return dmin_sum+ 32*s->qscale*s->qscale;*/
     case FF_CMP_RD:
         return dmin_sum;
     default:

         return dmin_sum+ 11*c->mb_penalty_factor;

     }

 }
 

 static inline void init_interlaced_ref(MpegEncContext *s, int ref_index){
     MotionEstContext * const c= &s->me;
 
     c->ref[1+ref_index][0] = c->ref[0+ref_index][0] + s->linesize;
     c->src[1][0] = c->src[0][0] + s->linesize;
     if(c->flags & FLAG_CHROMA){
         c->ref[1+ref_index][1] = c->ref[0+ref_index][1] + s->uvlinesize;
         c->ref[1+ref_index][2] = c->ref[0+ref_index][2] + s->uvlinesize;
         c->src[1][1] = c->src[0][1] + s->uvlinesize;
         c->src[1][2] = c->src[0][2] + s->uvlinesize;
     }
 }
 

 static int interlaced_search(MpegEncContext *s, int ref_index,

                              int16_t (*mv_tables[2][2])[2], uint8_t *field_select_tables[2], int mx, int my, int user_field_select)

 {

     MotionEstContext * const c= &s->me;

     const int size=0;
     const int h=8;
     int block;
     int P[10][2];

     uint8_t * const mv_penalty= c->current_mv_penalty;

     int same=1;
     const int stride= 2*s->linesize;
     int dmin_sum= 0;
     const int mot_stride= s->mb_stride;
     const int xy= s->mb_x + s->mb_y*mot_stride;

     c->ymin>>=1;
     c->ymax>>=1;
     c->stride<<=1;
     c->uvstride<<=1;

     init_interlaced_ref(s, ref_index);

     for(block=0; block<2; block++){
         int field_select;
         int best_dmin= INT_MAX;
         int best_field= -1;
 
         for(field_select=0; field_select<2; field_select++){

             int dmin, mx_i, my_i;

             int16_t (*mv_table)[2]= mv_tables[block][field_select];

             if(user_field_select){

                 av_assert1(field_select==0 || field_select==1);
                 av_assert1(field_select_tables[block][xy]==0 || field_select_tables[block][xy]==1);

                 if(field_select_tables[block][xy] != field_select)
                     continue;
             }

             P_LEFT[0] = mv_table[xy - 1][0];
             P_LEFT[1] = mv_table[xy - 1][1];

             if(P_LEFT[0]       > (c->xmax<<1)) P_LEFT[0]       = (c->xmax<<1);

             c->pred_x= P_LEFT[0];
             c->pred_y= P_LEFT[1];

             if(!s->first_slice_line){

                 P_TOP[0]      = mv_table[xy - mot_stride][0];
                 P_TOP[1]      = mv_table[xy - mot_stride][1];
                 P_TOPRIGHT[0] = mv_table[xy - mot_stride + 1][0];
                 P_TOPRIGHT[1] = mv_table[xy - mot_stride + 1][1];

                 if(P_TOP[1]      > (c->ymax<<1)) P_TOP[1]     = (c->ymax<<1);
                 if(P_TOPRIGHT[0] < (c->xmin<<1)) P_TOPRIGHT[0]= (c->xmin<<1);
                 if(P_TOPRIGHT[0] > (c->xmax<<1)) P_TOPRIGHT[0]= (c->xmax<<1);
                 if(P_TOPRIGHT[1] > (c->ymax<<1)) P_TOPRIGHT[1]= (c->ymax<<1);

                 P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
                 P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
             }
             P_MV1[0]= mx; //FIXME not correct if block != field_select
             P_MV1[1]= my / 2;

             dmin = epzs_motion_search2(s, &mx_i, &my_i, P, block, field_select+ref_index, mv_table, (1<<16)>>1);

             dmin= c->sub_motion_search(s, &mx_i, &my_i, dmin, block, field_select+ref_index, size, h);

             mv_table[xy][0]= mx_i;
             mv_table[xy][1]= my_i;

             if (s->mecc.me_sub_cmp[0] != s->mecc.mb_cmp[0]) {

                 int dxy;
 
                 //FIXME chroma ME

                 uint8_t *ref= c->ref[field_select+ref_index][0] + (mx_i>>1) + (my_i>>1)*stride;

                 dxy = ((my_i & 1) << 1) | (mx_i & 1);
 
                 if(s->no_rounding){

                     s->hdsp.put_no_rnd_pixels_tab[size][dxy](c->scratchpad, ref    , stride, h);

                 }else{

                     s->hdsp.put_pixels_tab       [size][dxy](c->scratchpad, ref    , stride, h);

                 }

                 dmin = s->mecc.mb_cmp[size](s, c->src[block][0], c->scratchpad, stride, h);

                 dmin+= (mv_penalty[mx_i-c->pred_x] + mv_penalty[my_i-c->pred_y] + 1)*c->mb_penalty_factor;

             }else

                 dmin+= c->mb_penalty_factor; //field_select bits

             dmin += field_select != block; //slightly prefer same field

             if(dmin < best_dmin){
                 best_dmin= dmin;
                 best_field= field_select;
             }
         }
         {
             int16_t (*mv_table)[2]= mv_tables[block][best_field];
 
             if(mv_table[xy][0] != mx) same=0; //FIXME check if these checks work and are any good at all
             if(mv_table[xy][1]&1) same=0;

             if(mv_table[xy][1]*2 != my) same=0;

             if(best_field != block) same=0;
         }
 
         field_select_tables[block][xy]= best_field;
         dmin_sum += best_dmin;
     }

     c->ymin<<=1;
     c->ymax<<=1;
     c->stride>>=1;
     c->uvstride>>=1;

 
     if(same)
         return INT_MAX;

     switch(c->avctx->mb_cmp&0xFF){

     /*case FF_CMP_SSE:
         return dmin_sum+ 32*s->qscale*s->qscale;*/
     case FF_CMP_RD:
         return dmin_sum;
     default:

         return dmin_sum+ 11*c->mb_penalty_factor;

     }
 }
 

 static inline int get_penalty_factor(int lambda, int lambda2, int type){
     switch(type&0xFF){
     default:
     case FF_CMP_SAD:
         return lambda>>FF_LAMBDA_SHIFT;
     case FF_CMP_DCT:
         return (3*lambda)>>(FF_LAMBDA_SHIFT+1);

     case FF_CMP_W53:
         return (4*lambda)>>(FF_LAMBDA_SHIFT);
     case FF_CMP_W97:
         return (2*lambda)>>(FF_LAMBDA_SHIFT);

     case FF_CMP_SATD:
     case FF_CMP_DCT264:
         return (2*lambda)>>FF_LAMBDA_SHIFT;
     case FF_CMP_RD:
     case FF_CMP_PSNR:
     case FF_CMP_SSE:
     case FF_CMP_NSSE:
         return lambda2>>FF_LAMBDA_SHIFT;
     case FF_CMP_BIT:

     case FF_CMP_MEDIAN_SAD:

         return 1;
     }
 }
 

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

     MotionEstContext * const c= &s->me;

     uint8_t *pix, *ppix;

     int sum, mx = 0, my = 0, dmin = 0;

     int varc;            ///< the variance of the block (sum of squared (p[y][x]-average))
     int vard;            ///< sum of squared differences with the estimated motion vector

     int P[10][2];

     const int shift= 1+s->quarter_sample;
     int mb_type=0;

     Picture * const pic= &s->current_picture;

     init_ref(c, s->new_picture.f->data, s->last_picture.f->data, NULL, 16*mb_x, 16*mb_y, 0);

     av_assert0(s->quarter_sample==0 || s->quarter_sample==1);
     av_assert0(s->linesize == c->stride);
     av_assert0(s->uvlinesize == c->uvstride);

     c->penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_cmp);
     c->sub_penalty_factor= get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_sub_cmp);
     c->mb_penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->mb_cmp);

     c->current_mv_penalty= c->mv_penalty[s->f_code] + MAX_DMV;

     get_limits(s, 16*mb_x, 16*mb_y);

     c->skip=0;

     /* intra / predictive decision */
     pix = c->src[0][0];

     sum  = s->mpvencdsp.pix_sum(pix, s->linesize);
     varc = s->mpvencdsp.pix_norm1(pix, s->linesize) -
            (((unsigned) sum * sum) >> 8) + 500;

 
     pic->mb_mean[s->mb_stride * mb_y + mb_x] = (sum+128)>>8;

     pic->mb_var [s->mb_stride * mb_y + mb_x] = (varc+128)>>8;
     c->mb_var_sum_temp += (varc+128)>>8;

     if (s->motion_est != FF_ME_ZERO) {
         const int mot_stride = s->b8_stride;
         const int mot_xy = s->block_index[0];

         P_LEFT[0] = s->current_picture.motion_val[0][mot_xy - 1][0];
         P_LEFT[1] = s->current_picture.motion_val[0][mot_xy - 1][1];

         if (P_LEFT[0] > (c->xmax << shift))
             P_LEFT[0] =  c->xmax << shift;

         if (!s->first_slice_line) {
             P_TOP[0]      = s->current_picture.motion_val[0][mot_xy - mot_stride    ][0];
             P_TOP[1]      = s->current_picture.motion_val[0][mot_xy - mot_stride    ][1];
             P_TOPRIGHT[0] = s->current_picture.motion_val[0][mot_xy - mot_stride + 2][0];
             P_TOPRIGHT[1] = s->current_picture.motion_val[0][mot_xy - mot_stride + 2][1];
             if (P_TOP[1] > (c->ymax << shift))
                 P_TOP[1] =  c->ymax << shift;

             if (P_TOPRIGHT[0] < (c->xmin * (1 << shift)))
                 P_TOPRIGHT[0] =  c->xmin * (1 << shift);
             if (P_TOPRIGHT[1] > (c->ymax * (1 << shift)))
                 P_TOPRIGHT[1] =  c->ymax * (1 << shift);

 
             P_MEDIAN[0] = mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
             P_MEDIAN[1] = mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
 
             if (s->out_format == FMT_H263) {
                 c->pred_x = P_MEDIAN[0];
                 c->pred_y = P_MEDIAN[1];

             } else { /* MPEG-1 at least */

                 c->pred_x = P_LEFT[0];
                 c->pred_y = P_LEFT[1];
             }
         } else {
             c->pred_x = P_LEFT[0];
             c->pred_y = P_LEFT[1];

         }

         dmin = ff_epzs_motion_search(s, &mx, &my, P, 0, 0, s->p_mv_table, (1<<16)>>shift, 0, 16);

     }
 

     /* At this point (mx,my) are full-pell and the relative displacement */

     ppix = c->ref[0][0] + (my * s->linesize) + mx;

     vard = s->mecc.sse[0](NULL, pix, ppix, s->linesize, 16);

     pic->mc_mb_var[s->mb_stride * mb_y + mb_x] = (vard+128)>>8;
     c->mc_mb_var_sum_temp += (vard+128)>>8;

     if (c->avctx->mb_decision > FF_MB_DECISION_SIMPLE) {

         int p_score= FFMIN(vard, varc-500+(s->lambda2>>FF_LAMBDA_SHIFT)*100);
         int i_score= varc-500+(s->lambda2>>FF_LAMBDA_SHIFT)*20;
         c->scene_change_score+= ff_sqrt(p_score) - ff_sqrt(i_score);

         if (vard*2 + 200*256 > varc)

             mb_type|= CANDIDATE_MB_TYPE_INTRA;

         if (varc*2 + 200*256 > vard || s->qscale > 24){
 //        if (varc*2 + 200*256 + 50*(s->lambda2>>FF_LAMBDA_SHIFT) > vard){

             mb_type|= CANDIDATE_MB_TYPE_INTER;

             c->sub_motion_search(s, &mx, &my, dmin, 0, 0, 0, 16);

             if (s->mpv_flags & FF_MPV_FLAG_MV0)

                 if(mx || my)

                     mb_type |= CANDIDATE_MB_TYPE_SKIPPED; //FIXME check difference

         }else{

             mx <<=shift;
             my <<=shift;

         }

         if ((s->avctx->flags & AV_CODEC_FLAG_4MV)

            && !c->skip && varc>50<<8 && vard>10<<8){

             if(h263_mv4_search(s, mx, my, shift) < INT_MAX)
                 mb_type|=CANDIDATE_MB_TYPE_INTER4V;

 
             set_p_mv_tables(s, mx, my, 0);
         }else
             set_p_mv_tables(s, mx, my, 1);

         if ((s->avctx->flags & AV_CODEC_FLAG_INTERLACED_ME)

            && !c->skip){ //FIXME varc/d checks

             if(interlaced_search(s, 0, s->p_field_mv_table, s->p_field_select_table, mx, my, 0) < INT_MAX)

                 mb_type |= CANDIDATE_MB_TYPE_INTER_I;
         }

     }else{

         int intra_score, i;

         mb_type= CANDIDATE_MB_TYPE_INTER;

         dmin= c->sub_motion_search(s, &mx, &my, dmin, 0, 0, 0, 16);

         if(c->avctx->me_sub_cmp != c->avctx->mb_cmp && !c->skip)

             dmin= get_mb_score(s, mx, my, 0, 0, 0, 16, 1);

         if ((s->avctx->flags & AV_CODEC_FLAG_4MV)

            && !c->skip && varc>50<<8 && vard>10<<8){

             int dmin4= h263_mv4_search(s, mx, my, shift);

             if(dmin4 < dmin){

                 mb_type= CANDIDATE_MB_TYPE_INTER4V;

                 dmin=dmin4;

             }

         }

         if ((s->avctx->flags & AV_CODEC_FLAG_INTERLACED_ME)

            && !c->skip){ //FIXME varc/d checks

             int dmin_i= interlaced_search(s, 0, s->p_field_mv_table, s->p_field_select_table, mx, my, 0);

             if(dmin_i < dmin){
                 mb_type = CANDIDATE_MB_TYPE_INTER_I;
                 dmin= dmin_i;
             }
         }

         set_p_mv_tables(s, mx, my, mb_type!=CANDIDATE_MB_TYPE_INTER4V);

 
         /* get intra luma score */

         if((c->avctx->mb_cmp&0xFF)==FF_CMP_SSE){

             intra_score= varc - 500;

         }else{

             unsigned mean = (sum+128)>>8;

             mean*= 0x01010101;

             for(i=0; i<16; i++){

                 *(uint32_t*)(&c->scratchpad[i*s->linesize+ 0]) = mean;
                 *(uint32_t*)(&c->scratchpad[i*s->linesize+ 4]) = mean;
                 *(uint32_t*)(&c->scratchpad[i*s->linesize+ 8]) = mean;
                 *(uint32_t*)(&c->scratchpad[i*s->linesize+12]) = mean;

             }
 

             intra_score= s->mecc.mb_cmp[0](s, c->scratchpad, pix, s->linesize, 16);

         }

         intra_score += c->mb_penalty_factor*16;

         if(intra_score < dmin){

             mb_type= CANDIDATE_MB_TYPE_INTRA;

             s->current_picture.mb_type[mb_y*s->mb_stride + mb_x] = CANDIDATE_MB_TYPE_INTRA; //FIXME cleanup

         }else

             s->current_picture.mb_type[mb_y*s->mb_stride + mb_x] = 0;

         {
             int p_score= FFMIN(vard, varc-500+(s->lambda2>>FF_LAMBDA_SHIFT)*100);
             int i_score= varc-500+(s->lambda2>>FF_LAMBDA_SHIFT)*20;
             c->scene_change_score+= ff_sqrt(p_score) - ff_sqrt(i_score);

         }

     }

     s->mb_type[mb_y*s->mb_stride + mb_x]= mb_type;

 }
 

 int ff_pre_estimate_p_frame_motion(MpegEncContext * s,
                                     int mb_x, int mb_y)
 {

     MotionEstContext * const c= &s->me;

     int mx, my, dmin;

     int P[10][2];
     const int shift= 1+s->quarter_sample;

     const int xy= mb_x + mb_y*s->mb_stride;

     init_ref(c, s->new_picture.f->data, s->last_picture.f->data, NULL, 16*mb_x, 16*mb_y, 0);

     av_assert0(s->quarter_sample==0 || s->quarter_sample==1);

     c->pre_penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_pre_cmp);

     c->current_mv_penalty= c->mv_penalty[s->f_code] + MAX_DMV;

     get_limits(s, 16*mb_x, 16*mb_y);

     c->skip=0;

 
     P_LEFT[0]       = s->p_mv_table[xy + 1][0];
     P_LEFT[1]       = s->p_mv_table[xy + 1][1];
 

     if(P_LEFT[0]       < (c->xmin<<shift)) P_LEFT[0]       = (c->xmin<<shift);

 
     /* special case for first line */

     if (s->first_slice_line) {

         c->pred_x= P_LEFT[0];
         c->pred_y= P_LEFT[1];

         P_TOP[0]= P_TOPRIGHT[0]= P_MEDIAN[0]=

         P_TOP[1]= P_TOPRIGHT[1]= P_MEDIAN[1]= 0; //FIXME

     } else {

         P_TOP[0]      = s->p_mv_table[xy + s->mb_stride    ][0];
         P_TOP[1]      = s->p_mv_table[xy + s->mb_stride    ][1];
         P_TOPRIGHT[0] = s->p_mv_table[xy + s->mb_stride - 1][0];
         P_TOPRIGHT[1] = s->p_mv_table[xy + s->mb_stride - 1][1];

         if(P_TOP[1]      < (c->ymin<<shift)) P_TOP[1]     = (c->ymin<<shift);
         if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift);
         if(P_TOPRIGHT[1] < (c->ymin<<shift)) P_TOPRIGHT[1]= (c->ymin<<shift);

         P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
         P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
 

         c->pred_x = P_MEDIAN[0];
         c->pred_y = P_MEDIAN[1];

     }

     dmin = ff_epzs_motion_search(s, &mx, &my, P, 0, 0, s->p_mv_table, (1<<16)>>shift, 0, 16);

     s->p_mv_table[xy][0] = mx<<shift;
     s->p_mv_table[xy][1] = my<<shift;

     return dmin;
 }
 

 static int estimate_motion_b(MpegEncContext *s, int mb_x, int mb_y,
                              int16_t (*mv_table)[2], int ref_index, int f_code)

 {

     MotionEstContext * const c= &s->me;

     int mx = 0, my = 0, dmin = 0;

     int P[10][2];

     const int shift= 1+s->quarter_sample;

     const int mot_stride = s->mb_stride;
     const int mot_xy = mb_y*mot_stride + mb_x;

     uint8_t * const mv_penalty= c->mv_penalty[f_code] + MAX_DMV;

     int mv_scale;

     c->penalty_factor    = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_cmp);
     c->sub_penalty_factor= get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_sub_cmp);
     c->mb_penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->mb_cmp);

     c->current_mv_penalty= mv_penalty;

     get_limits(s, 16*mb_x, 16*mb_y);

     if (s->motion_est != FF_ME_ZERO) {

         P_LEFT[0] = mv_table[mot_xy - 1][0];
         P_LEFT[1] = mv_table[mot_xy - 1][1];

         if (P_LEFT[0] > (c->xmax << shift)) P_LEFT[0] = (c->xmax << shift);

         /* special case for first line */
         if (!s->first_slice_line) {
             P_TOP[0]      = mv_table[mot_xy - mot_stride    ][0];
             P_TOP[1]      = mv_table[mot_xy - mot_stride    ][1];
             P_TOPRIGHT[0] = mv_table[mot_xy - mot_stride + 1][0];
             P_TOPRIGHT[1] = mv_table[mot_xy - mot_stride + 1][1];
             if (P_TOP[1] > (c->ymax << shift)) P_TOP[1] = (c->ymax << shift);
             if (P_TOPRIGHT[0] < (c->xmin << shift)) P_TOPRIGHT[0] = (c->xmin << shift);
             if (P_TOPRIGHT[1] > (c->ymax << shift)) P_TOPRIGHT[1] = (c->ymax << shift);
 
             P_MEDIAN[0] = mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
             P_MEDIAN[1] = mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);

         }

         c->pred_x = P_LEFT[0];
         c->pred_y = P_LEFT[1];

         if(mv_table == s->b_forw_mv_table){
             mv_scale= (s->pb_time<<16) / (s->pp_time<<shift);
         }else{
             mv_scale= ((s->pb_time - s->pp_time)<<16) / (s->pp_time<<shift);
         }

         dmin = ff_epzs_motion_search(s, &mx, &my, P, 0, ref_index, s->p_mv_table, mv_scale, 0, 16);

     }

     dmin= c->sub_motion_search(s, &mx, &my, dmin, 0, ref_index, 0, 16);

     if(c->avctx->me_sub_cmp != c->avctx->mb_cmp && !c->skip)

         dmin= get_mb_score(s, mx, my, 0, ref_index, 0, 16, 1);

 //    s->mb_type[mb_y*s->mb_width + mb_x]= mb_type;
     mv_table[mot_xy][0]= mx;
     mv_table[mot_xy][1]= my;

     return dmin;

 }
 

 static inline int check_bidir_mv(MpegEncContext * s,

                    int motion_fx, int motion_fy,
                    int motion_bx, int motion_by,
                    int pred_fx, int pred_fy,

                    int pred_bx, int pred_by,
                    int size, int h)

 {

     //FIXME optimize?

     //FIXME better f_code prediction (max mv & distance)

     //FIXME pointers

     MotionEstContext * const c= &s->me;

     uint8_t * const mv_penalty_f= c->mv_penalty[s->f_code] + MAX_DMV; // f_code of the prev frame
     uint8_t * const mv_penalty_b= c->mv_penalty[s->b_code] + MAX_DMV; // f_code of the prev frame

     int stride= c->stride;
     uint8_t *dest_y = c->scratchpad;

     uint8_t *ptr;
     int dxy;
     int src_x, src_y;
     int fbmin;

     uint8_t **src_data= c->src[0];
     uint8_t **ref_data= c->ref[0];
     uint8_t **ref2_data= c->ref[2];

     if(s->quarter_sample){
         dxy = ((motion_fy & 3) << 2) | (motion_fx & 3);

         src_x = motion_fx >> 2;
         src_y = motion_fy >> 2;

         ptr = ref_data[0] + (src_y * stride) + src_x;

         s->qdsp.put_qpel_pixels_tab[0][dxy](dest_y, ptr, stride);

 
         dxy = ((motion_by & 3) << 2) | (motion_bx & 3);

         src_x = motion_bx >> 2;
         src_y = motion_by >> 2;

         ptr = ref2_data[0] + (src_y * stride) + src_x;

         s->qdsp.avg_qpel_pixels_tab[size][dxy](dest_y, ptr, stride);

     }else{
         dxy = ((motion_fy & 1) << 1) | (motion_fx & 1);

         src_x = motion_fx >> 1;
         src_y = motion_fy >> 1;

         ptr = ref_data[0] + (src_y * stride) + src_x;

         s->hdsp.put_pixels_tab[size][dxy](dest_y    , ptr    , stride, h);

 
         dxy = ((motion_by & 1) << 1) | (motion_bx & 1);

         src_x = motion_bx >> 1;
         src_y = motion_by >> 1;

         ptr = ref2_data[0] + (src_y * stride) + src_x;

         s->hdsp.avg_pixels_tab[size][dxy](dest_y    , ptr    , stride, h);

     }
 

     fbmin = (mv_penalty_f[motion_fx-pred_fx] + mv_penalty_f[motion_fy-pred_fy])*c->mb_penalty_factor
            +(mv_penalty_b[motion_bx-pred_bx] + mv_penalty_b[motion_by-pred_by])*c->mb_penalty_factor

            + s->mecc.mb_cmp[size](s, src_data[0], dest_y, stride, h); // FIXME new_pic

     if(c->avctx->mb_cmp&FF_CMP_CHROMA){

     }
     //FIXME CHROMA !!!

     return fbmin;
 }

 /* refine the bidir vectors in hq mode and return the score in both lq & hq mode*/

 static inline int bidir_refine(MpegEncContext * s, int mb_x, int mb_y)

 {

     MotionEstContext * const c= &s->me;

     const int mot_stride = s->mb_stride;
     const int xy = mb_y *mot_stride + mb_x;

     int fbmin;
     int pred_fx= s->b_bidir_forw_mv_table[xy-1][0];
     int pred_fy= s->b_bidir_forw_mv_table[xy-1][1];
     int pred_bx= s->b_bidir_back_mv_table[xy-1][0];
     int pred_by= s->b_bidir_back_mv_table[xy-1][1];
     int motion_fx= s->b_bidir_forw_mv_table[xy][0]= s->b_forw_mv_table[xy][0];
     int motion_fy= s->b_bidir_forw_mv_table[xy][1]= s->b_forw_mv_table[xy][1];
     int motion_bx= s->b_bidir_back_mv_table[xy][0]= s->b_back_mv_table[xy][0];
     int motion_by= s->b_bidir_back_mv_table[xy][1]= s->b_back_mv_table[xy][1];

     const int flags= c->sub_flags;
     const int qpel= flags&FLAG_QPEL;
     const int shift= 1+qpel;
     const int xmin= c->xmin<<shift;
     const int ymin= c->ymin<<shift;
     const int xmax= c->xmax<<shift;
     const int ymax= c->ymax<<shift;

 #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))

     int hashidx= HASH(motion_fx,motion_fy, motion_bx, motion_by);

     uint8_t map[256] = { 0 };

     map[hashidx&255] = 1;

     fbmin= check_bidir_mv(s, motion_fx, motion_fy,

                           motion_bx, motion_by,
                           pred_fx, pred_fy,

                           pred_bx, pred_by,
                           0, 16);

     if(s->avctx->bidir_refine){

         int end;
         static const uint8_t limittab[5]={0,8,32,64,80};
         const int limit= limittab[s->avctx->bidir_refine];
         static const int8_t vect[][4]={
 { 0, 0, 0, 1}, { 0, 0, 0,-1}, { 0, 0, 1, 0}, { 0, 0,-1, 0}, { 0, 1, 0, 0}, { 0,-1, 0, 0}, { 1, 0, 0, 0}, {-1, 0, 0, 0},
 
 { 0, 0, 1, 1}, { 0, 0,-1,-1}, { 0, 1, 1, 0}, { 0,-1,-1, 0}, { 1, 1, 0, 0}, {-1,-1, 0, 0}, { 1, 0, 0, 1}, {-1, 0, 0,-1},
 { 0, 1, 0, 1}, { 0,-1, 0,-1}, { 1, 0, 1, 0}, {-1, 0,-1, 0},
 { 0, 0,-1, 1}, { 0, 0, 1,-1}, { 0,-1, 1, 0}, { 0, 1,-1, 0}, {-1, 1, 0, 0}, { 1,-1, 0, 0}, { 1, 0, 0,-1}, {-1, 0, 0, 1},
 { 0,-1, 0, 1}, { 0, 1, 0,-1}, {-1, 0, 1, 0}, { 1, 0,-1, 0},
 
 { 0, 1, 1, 1}, { 0,-1,-1,-1}, { 1, 1, 1, 0}, {-1,-1,-1, 0}, { 1, 1, 0, 1}, {-1,-1, 0,-1}, { 1, 0, 1, 1}, {-1, 0,-1,-1},
 { 0,-1, 1, 1}, { 0, 1,-1,-1}, {-1, 1, 1, 0}, { 1,-1,-1, 0}, { 1, 1, 0,-1}, {-1,-1, 0, 1}, { 1, 0,-1, 1}, {-1, 0, 1,-1},
 { 0, 1,-1, 1}, { 0,-1, 1,-1}, { 1,-1, 1, 0}, {-1, 1,-1, 0}, {-1, 1, 0, 1}, { 1,-1, 0,-1}, { 1, 0, 1,-1}, {-1, 0,-1, 1},
 { 0, 1, 1,-1}, { 0,-1,-1, 1}, { 1, 1,-1, 0}, {-1,-1, 1, 0}, { 1,-1, 0, 1}, {-1, 1, 0,-1}, {-1, 0, 1, 1}, { 1, 0,-1,-1},
 
 { 1, 1, 1, 1}, {-1,-1,-1,-1},
 { 1, 1, 1,-1}, {-1,-1,-1, 1}, { 1, 1,-1, 1}, {-1,-1, 1,-1}, { 1,-1, 1, 1}, {-1, 1,-1,-1}, {-1, 1, 1, 1}, { 1,-1,-1,-1},
 { 1, 1,-1,-1}, {-1,-1, 1, 1}, { 1,-1,-1, 1}, {-1, 1, 1,-1}, { 1,-1, 1,-1}, {-1, 1,-1, 1},
         };
         static const uint8_t hash[]={

 HASH8( 0, 0, 0, 1), HASH8( 0, 0, 0,-1), HASH8( 0, 0, 1, 0), HASH8( 0, 0,-1, 0), HASH8( 0, 1, 0, 0), HASH8( 0,-1, 0, 0), HASH8( 1, 0, 0, 0), HASH8(-1, 0, 0, 0),

 HASH8( 0, 0, 1, 1), HASH8( 0, 0,-1,-1), HASH8( 0, 1, 1, 0), HASH8( 0,-1,-1, 0), HASH8( 1, 1, 0, 0), HASH8(-1,-1, 0, 0), HASH8( 1, 0, 0, 1), HASH8(-1, 0, 0,-1),
 HASH8( 0, 1, 0, 1), HASH8( 0,-1, 0,-1), HASH8( 1, 0, 1, 0), HASH8(-1, 0,-1, 0),
 HASH8( 0, 0,-1, 1), HASH8( 0, 0, 1,-1), HASH8( 0,-1, 1, 0), HASH8( 0, 1,-1, 0), HASH8(-1, 1, 0, 0), HASH8( 1,-1, 0, 0), HASH8( 1, 0, 0,-1), HASH8(-1, 0, 0, 1),
 HASH8( 0,-1, 0, 1), HASH8( 0, 1, 0,-1), HASH8(-1, 0, 1, 0), HASH8( 1, 0,-1, 0),

 HASH8( 0, 1, 1, 1), HASH8( 0,-1,-1,-1), HASH8( 1, 1, 1, 0), HASH8(-1,-1,-1, 0), HASH8( 1, 1, 0, 1), HASH8(-1,-1, 0,-1), HASH8( 1, 0, 1, 1), HASH8(-1, 0,-1,-1),
 HASH8( 0,-1, 1, 1), HASH8( 0, 1,-1,-1), HASH8(-1, 1, 1, 0), HASH8( 1,-1,-1, 0), HASH8( 1, 1, 0,-1), HASH8(-1,-1, 0, 1), HASH8( 1, 0,-1, 1), HASH8(-1, 0, 1,-1),
 HASH8( 0, 1,-1, 1), HASH8( 0,-1, 1,-1), HASH8( 1,-1, 1, 0), HASH8(-1, 1,-1, 0), HASH8(-1, 1, 0, 1), HASH8( 1,-1, 0,-1), HASH8( 1, 0, 1,-1), HASH8(-1, 0,-1, 1),
 HASH8( 0, 1, 1,-1), HASH8( 0,-1,-1, 1), HASH8( 1, 1,-1, 0), HASH8(-1,-1, 1, 0), HASH8( 1,-1, 0, 1), HASH8(-1, 1, 0,-1), HASH8(-1, 0, 1, 1), HASH8( 1, 0,-1,-1),

 HASH8( 1, 1, 1, 1), HASH8(-1,-1,-1,-1),
 HASH8( 1, 1, 1,-1), HASH8(-1,-1,-1, 1), HASH8( 1, 1,-1, 1), HASH8(-1,-1, 1,-1), HASH8( 1,-1, 1, 1), HASH8(-1, 1,-1,-1), HASH8(-1, 1, 1, 1), HASH8( 1,-1,-1,-1),
 HASH8( 1, 1,-1,-1), HASH8(-1,-1, 1, 1), HASH8( 1,-1,-1, 1), HASH8(-1, 1, 1,-1), HASH8( 1,-1, 1,-1), HASH8(-1, 1,-1, 1),

 };
 

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

     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;\
         }\

     }
 #define CHECK_BIDIR2(a,b,c,d)\
 CHECK_BIDIR(a,b,c,d)\

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

 
         do{

             int i;
             int borderdist=0;

             end=1;
 

             CHECK_BIDIR2(0,0,0,1)
             CHECK_BIDIR2(0,0,1,0)
             CHECK_BIDIR2(0,1,0,0)
             CHECK_BIDIR2(1,0,0,0)
 
             for(i=8; i<limit; i++){
                 int fx= motion_fx+vect[i][0];
                 int fy= motion_fy+vect[i][1];
                 int bx= motion_bx+vect[i][2];
                 int by= motion_by+vect[i][3];
                 if(borderdist<=0){
                     int a= (xmax - FFMAX(fx,bx))|(FFMIN(fx,bx) - xmin);
                     int b= (ymax - FFMAX(fy,by))|(FFMIN(fy,by) - ymin);
                     if((a|b) < 0)
                         map[(hashidx+hash[i])&255] = 1;
                 }
                 if(!map[(hashidx+hash[i])&255]){
                     int score;
                     map[(hashidx+hash[i])&255] = 1;
                     score= check_bidir_mv(s, fx, fy, bx, by, pred_fx, pred_fy, pred_bx, pred_by, 0, 16);
                     if(score < fbmin){
                         hashidx += hash[i];
                         fbmin= score;
                         motion_fx=fx;
                         motion_fy=fy;
                         motion_bx=bx;
                         motion_by=by;
                         end=0;
                         borderdist--;
                         if(borderdist<=0){
                             int a= FFMIN(xmax - FFMAX(fx,bx), FFMIN(fx,bx) - xmin);
                             int b= FFMIN(ymax - FFMAX(fy,by), FFMIN(fy,by) - ymin);
                             borderdist= FFMIN(a,b);
                         }

                     }
                 }
             }
         }while(!end);
     }
 

     s->b_bidir_forw_mv_table[xy][0]= motion_fx;
     s->b_bidir_forw_mv_table[xy][1]= motion_fy;
     s->b_bidir_back_mv_table[xy][0]= motion_bx;
     s->b_bidir_back_mv_table[xy][1]= motion_by;
 

     return fbmin;

 }
 

 static inline int direct_search(MpegEncContext * s, int mb_x, int mb_y)

 {

     MotionEstContext * const c= &s->me;

     int P[10][2];

     const int mot_stride = s->mb_stride;
     const int mot_xy = mb_y*mot_stride + mb_x;

     const int shift= 1+s->quarter_sample;
     int dmin, i;

     const int time_pp= s->pp_time;

     const int time_pb= s->pb_time;

     int mx, my, xmin, xmax, ymin, ymax;

     int16_t (*mv_table)[2]= s->b_direct_mv_table;

     c->current_mv_penalty= c->mv_penalty[1] + MAX_DMV;

     ymin= xmin=(-32)>>shift;
     ymax= xmax=   31>>shift;
 

     if (IS_8X8(s->next_picture.mb_type[mot_xy])) {

         s->mv_type= MV_TYPE_8X8;
     }else{
         s->mv_type= MV_TYPE_16X16;

     }

 
     for(i=0; i<4; i++){
         int index= s->block_index[i];
         int min, max;

         c->co_located_mv[i][0] = s->next_picture.motion_val[0][index][0];
         c->co_located_mv[i][1] = s->next_picture.motion_val[0][index][1];

         c->direct_basis_mv[i][0]= c->co_located_mv[i][0]*time_pb/time_pp + ((i& 1)<<(shift+3));
         c->direct_basis_mv[i][1]= c->co_located_mv[i][1]*time_pb/time_pp + ((i>>1)<<(shift+3));
 //        c->direct_basis_mv[1][i][0]= c->co_located_mv[i][0]*(time_pb - time_pp)/time_pp + ((i &1)<<(shift+3);
 //        c->direct_basis_mv[1][i][1]= c->co_located_mv[i][1]*(time_pb - time_pp)/time_pp + ((i>>1)<<(shift+3);
 
         max= FFMAX(c->direct_basis_mv[i][0], c->direct_basis_mv[i][0] - c->co_located_mv[i][0])>>shift;
         min= FFMIN(c->direct_basis_mv[i][0], c->direct_basis_mv[i][0] - c->co_located_mv[i][0])>>shift;

         max+= 16*mb_x + 1; // +-1 is for the simpler rounding
         min+= 16*mb_x - 1;

         xmax= FFMIN(xmax, s->width - max);
         xmin= FFMAX(xmin, - 16     - min);

         max= FFMAX(c->direct_basis_mv[i][1], c->direct_basis_mv[i][1] - c->co_located_mv[i][1])>>shift;
         min= FFMIN(c->direct_basis_mv[i][1], c->direct_basis_mv[i][1] - c->co_located_mv[i][1])>>shift;

         max+= 16*mb_y + 1; // +-1 is for the simpler rounding
         min+= 16*mb_y - 1;

         ymax= FFMIN(ymax, s->height - max);
         ymin= FFMAX(ymin, - 16      - min);

         if(s->mv_type == MV_TYPE_16X16) break;

     }

     av_assert2(xmax <= 15 && ymax <= 15 && xmin >= -16 && ymin >= -16);

     if(xmax < 0 || xmin >0 || ymax < 0 || ymin > 0){
         s->b_direct_mv_table[mot_xy][0]= 0;
         s->b_direct_mv_table[mot_xy][1]= 0;
 
         return 256*256*256*64;
     }

     c->xmin= xmin;
     c->ymin= ymin;
     c->xmax= xmax;
     c->ymax= ymax;
     c->flags     |= FLAG_DIRECT;
     c->sub_flags |= FLAG_DIRECT;
     c->pred_x=0;
     c->pred_y=0;

     P_LEFT[0]        = av_clip(mv_table[mot_xy - 1][0], xmin<<shift, xmax<<shift);
     P_LEFT[1]        = av_clip(mv_table[mot_xy - 1][1], ymin<<shift, ymax<<shift);

 
     /* special case for first line */

     if (!s->first_slice_line) { //FIXME maybe allow this over thread boundary as it is clipped

         P_TOP[0]      = av_clip(mv_table[mot_xy - mot_stride             ][0], xmin<<shift, xmax<<shift);
         P_TOP[1]      = av_clip(mv_table[mot_xy - mot_stride             ][1], ymin<<shift, ymax<<shift);
         P_TOPRIGHT[0] = av_clip(mv_table[mot_xy - mot_stride + 1         ][0], xmin<<shift, xmax<<shift);
         P_TOPRIGHT[1] = av_clip(mv_table[mot_xy - mot_stride + 1         ][1], ymin<<shift, ymax<<shift);

         P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
         P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
     }

     dmin = ff_epzs_motion_search(s, &mx, &my, P, 0, 0, mv_table, 1<<(16-shift), 0, 16);

     if(c->sub_flags&FLAG_QPEL)

         dmin = qpel_motion_search(s, &mx, &my, dmin, 0, 0, 0, 16);
     else
         dmin = hpel_motion_search(s, &mx, &my, dmin, 0, 0, 0, 16);

     if(c->avctx->me_sub_cmp != c->avctx->mb_cmp && !c->skip)

         dmin= get_mb_score(s, mx, my, 0, 0, 0, 16, 1);

     get_limits(s, 16*mb_x, 16*mb_y); //restore c->?min/max, maybe not needed

     mv_table[mot_xy][0]= mx;
     mv_table[mot_xy][1]= my;

     c->flags     &= ~FLAG_DIRECT;
     c->sub_flags &= ~FLAG_DIRECT;

     return dmin;

 }
 
 void ff_estimate_b_frame_motion(MpegEncContext * s,
                              int mb_x, int mb_y)
 {

     MotionEstContext * const c= &s->me;
     const int penalty_factor= c->mb_penalty_factor;

     int fmin, bmin, dmin, fbmin, bimin, fimin;

     int type=0;

     const int xy = mb_y*s->mb_stride + mb_x;

     init_ref(c, s->new_picture.f->data, s->last_picture.f->data,
              s->next_picture.f->data, 16 * mb_x, 16 * mb_y, 2);

     get_limits(s, 16*mb_x, 16*mb_y);

     c->skip=0;

     if (s->codec_id == AV_CODEC_ID_MPEG4 && s->next_picture.mbskip_table[xy]) {

         int score= direct_search(s, mb_x, mb_y); //FIXME just check 0,0
 
         score= ((unsigned)(score*score + 128*256))>>16;
         c->mc_mb_var_sum_temp += score;
         s->current_picture.mc_mb_var[mb_y*s->mb_stride + mb_x] = score; //FIXME use SSE
         s->mb_type[mb_y*s->mb_stride + mb_x]= CANDIDATE_MB_TYPE_DIRECT0;
 
         return;
     }
 

     if (s->codec_id == AV_CODEC_ID_MPEG4)

         dmin= direct_search(s, mb_x, mb_y);

     else
         dmin= INT_MAX;

 // FIXME penalty stuff for non-MPEG-4

     c->skip=0;

     fmin = estimate_motion_b(s, mb_x, mb_y, s->b_forw_mv_table, 0, s->f_code) +
            3 * penalty_factor;

     c->skip=0;

     bmin = estimate_motion_b(s, mb_x, mb_y, s->b_back_mv_table, 2, s->b_code) +
            2 * penalty_factor;

     ff_dlog(s, " %d %d ", s->b_forw_mv_table[xy][0], s->b_forw_mv_table[xy][1]);

     c->skip=0;

     fbmin= bidir_refine(s, mb_x, mb_y) + penalty_factor;

     ff_dlog(s, "%d %d %d %d\n", dmin, fmin, bmin, fbmin);

     if (s->avctx->flags & AV_CODEC_FLAG_INTERLACED_ME) {

 //FIXME mb type penalty

         c->skip=0;

         c->current_mv_penalty= c->mv_penalty[s->f_code] + MAX_DMV;

         fimin= interlaced_search(s, 0,
                                  s->b_field_mv_table[0], s->b_field_select_table[0],

                                  s->b_forw_mv_table[xy][0], s->b_forw_mv_table[xy][1], 0);

         c->current_mv_penalty= c->mv_penalty[s->b_code] + MAX_DMV;

         bimin= interlaced_search(s, 2,
                                  s->b_field_mv_table[1], s->b_field_select_table[1],

                                  s->b_back_mv_table[xy][0], s->b_back_mv_table[xy][1], 0);

     }else
         fimin= bimin= INT_MAX;
 

     {

         int score= fmin;

         type = CANDIDATE_MB_TYPE_FORWARD;

         if (dmin <= score){

             score = dmin;

             type = CANDIDATE_MB_TYPE_DIRECT;

         }
         if(bmin<score){
             score=bmin;

             type= CANDIDATE_MB_TYPE_BACKWARD;

         }
         if(fbmin<score){
             score=fbmin;

             type= CANDIDATE_MB_TYPE_BIDIR;
         }
         if(fimin<score){
             score=fimin;
             type= CANDIDATE_MB_TYPE_FORWARD_I;
         }
         if(bimin<score){
             score=bimin;
             type= CANDIDATE_MB_TYPE_BACKWARD_I;

         }

         score= ((unsigned)(score*score + 128*256))>>16;

         c->mc_mb_var_sum_temp += score;

         s->current_picture.mc_mb_var[mb_y*s->mb_stride + mb_x] = score; //FIXME use SSE

     }

     if(c->avctx->mb_decision > FF_MB_DECISION_SIMPLE){

         type= CANDIDATE_MB_TYPE_FORWARD | CANDIDATE_MB_TYPE_BACKWARD | CANDIDATE_MB_TYPE_BIDIR | CANDIDATE_MB_TYPE_DIRECT;
         if(fimin < INT_MAX)
             type |= CANDIDATE_MB_TYPE_FORWARD_I;
         if(bimin < INT_MAX)
             type |= CANDIDATE_MB_TYPE_BACKWARD_I;
         if(fimin < INT_MAX && bimin < INT_MAX){
             type |= CANDIDATE_MB_TYPE_BIDIR_I;
         }
          //FIXME something smarter

         if(dmin>256*256*16) type&= ~CANDIDATE_MB_TYPE_DIRECT; //do not try direct mode if it is invalid for this MB

         if (s->codec_id == AV_CODEC_ID_MPEG4 && type&CANDIDATE_MB_TYPE_DIRECT &&
             s->mpv_flags & FF_MPV_FLAG_MV0 && *(uint32_t*)s->b_direct_mv_table[xy])

             type |= CANDIDATE_MB_TYPE_DIRECT0;

     }
 

     s->mb_type[mb_y*s->mb_stride + mb_x]= type;

 }
 
 /* find best f_code for ME which do unlimited searches */
 int ff_get_best_fcode(MpegEncContext * s, int16_t (*mv_table)[2], int type)
 {

     if (s->motion_est != FF_ME_ZERO) {

         int score[8];

         int i, y, range= s->avctx->me_range ? s->avctx->me_range : (INT_MAX/2);

         uint8_t * fcode_tab= s->fcode_tab;

         int best_fcode=-1;
         int best_score=-10000000;

         if(s->msmpeg4_version)

             range= FFMIN(range, 16);

         else if(s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->avctx->strict_std_compliance >= FF_COMPLIANCE_NORMAL)

             range= FFMIN(range, 256);
 

         for(i=0; i<8; i++) score[i]= s->mb_num*(8-i);

 
         for(y=0; y<s->mb_height; y++){
             int x;

             int xy= y*s->mb_stride;

             for(x=0; x<s->mb_width; x++){

                 if(s->mb_type[xy] & type){

                     int mx= mv_table[xy][0];
                     int my= mv_table[xy][1];
                     int fcode= FFMAX(fcode_tab[mx + MAX_MV],
                                      fcode_tab[my + MAX_MV]);

                     int j;

 
                         if(mx >= range || mx < -range ||

                            my >= range || my < -range)
                             continue;

                     for(j=0; j<fcode && j<8; j++){

                         if(s->pict_type==AV_PICTURE_TYPE_B || s->current_picture.mc_mb_var[xy] < s->current_picture.mb_var[xy])

                             score[j]-= 170;
                     }

                 }
                 xy++;
             }
         }

         for(i=1; i<8; i++){
             if(score[i] > best_score){
                 best_score= score[i];
                 best_fcode= i;
             }

         }

 
         return best_fcode;

     }else{
         return 1;

     }
 }
 

 void ff_fix_long_p_mvs(MpegEncContext * s)
 {

     MotionEstContext * const c= &s->me;

     const int f_code= s->f_code;

     int y, range;

     av_assert0(s->pict_type==AV_PICTURE_TYPE_P);

     range = (((s->out_format == FMT_MPEG1 || s->msmpeg4_version) ? 8 : 16) << f_code);
 

     av_assert0(range <= 16 || !s->msmpeg4_version);
     av_assert0(range <=256 || !(s->codec_id == AV_CODEC_ID_MPEG2VIDEO && s->avctx->strict_std_compliance >= FF_COMPLIANCE_NORMAL));

     if(c->avctx->me_range && range > c->avctx->me_range) range= c->avctx->me_range;

     if (s->avctx->flags & AV_CODEC_FLAG_4MV) {

         const int wrap= s->b8_stride;

 
         /* clip / convert to intra 8x8 type MVs */
         for(y=0; y<s->mb_height; y++){

             int xy= y*2*wrap;

             int i= y*s->mb_stride;

             int x;
 
             for(x=0; x<s->mb_width; x++){

                 if(s->mb_type[i]&CANDIDATE_MB_TYPE_INTER4V){

                     int block;
                     for(block=0; block<4; block++){
                         int off= (block& 1) + (block>>1)*wrap;

                         int mx = s->current_picture.motion_val[0][ xy + off ][0];
                         int my = s->current_picture.motion_val[0][ xy + off ][1];

                         if(   mx >=range || mx <-range
                            || my >=range || my <-range){

                             s->mb_type[i] &= ~CANDIDATE_MB_TYPE_INTER4V;
                             s->mb_type[i] |= CANDIDATE_MB_TYPE_INTRA;

                             s->current_picture.mb_type[i] = CANDIDATE_MB_TYPE_INTRA;

                         }
                     }
                 }

                 xy+=2;
                 i++;

             }
         }
     }
 }
 

 /**
  * @param truncate 1 for truncation, 0 for using intra
  */

 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)

 {

     MotionEstContext * const c= &s->me;

     int y, h_range, v_range;

     // RAL: 8 in MPEG-1, 16 in MPEG-4

     int range = (((s->out_format == FMT_MPEG1 || s->msmpeg4_version) ? 8 : 16) << f_code);

     if(c->avctx->me_range && range > c->avctx->me_range) range= c->avctx->me_range;

     h_range= range;
     v_range= field_select_table ? range>>1 : range;
 

     /* clip / convert to intra 16x16 type MVs */
     for(y=0; y<s->mb_height; y++){
         int x;

         int xy= y*s->mb_stride;

         for(x=0; x<s->mb_width; x++){

             if (s->mb_type[xy] & type){    // RAL: "type" test added...

                 if (!field_select_table || field_select_table[xy] == field_select) {

                     if(   mv_table[xy][0] >=h_range || mv_table[xy][0] <-h_range
                        || mv_table[xy][1] >=v_range || mv_table[xy][1] <-v_range){
 
                         if(truncate){
                             if     (mv_table[xy][0] > h_range-1) mv_table[xy][0]=  h_range-1;
                             else if(mv_table[xy][0] < -h_range ) mv_table[xy][0]= -h_range;
                             if     (mv_table[xy][1] > v_range-1) mv_table[xy][1]=  v_range-1;
                             else if(mv_table[xy][1] < -v_range ) mv_table[xy][1]= -v_range;
                         }else{
                             s->mb_type[xy] &= ~type;
                             s->mb_type[xy] |= CANDIDATE_MB_TYPE_INTRA;
                             mv_table[xy][0]=
                             mv_table[xy][1]= 0;
                         }

                     }

                 }

             }
             xy++;
         }
     }
 }