The Tor Browser: media/libvpx/vp9/encoder/vp9_mcomp.c@ac0c01689b40 (annotated)

media/libvpx/vp9/encoder/vp9_mcomp.c@ac0c01689b40 (annotated)

media/libvpx/vp9/encoder/vp9_mcomp.c

Thu, 15 Jan 2015 15:59:08 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 15 Jan 2015 15:59:08 +0100
branch: TOR_BUG_9701
changeset 10: ac0c01689b40
permissions: -rw-r--r--

Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /*
  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 #include <limits.h>
 #include <math.h>
 #include <stdio.h>
 #include "./vpx_config.h"
 #include "vpx_mem/vpx_mem.h"
 #include "vp9/common/vp9_findnearmv.h"
 #include "vp9/common/vp9_common.h"
 #include "vp9/encoder/vp9_onyx_int.h"
 #include "vp9/encoder/vp9_mcomp.h"
 // #define NEW_DIAMOND_SEARCH
 void vp9_clamp_mv_min_max(MACROBLOCK *x, MV *mv) {
   const int col_min = (mv->col >> 3) - MAX_FULL_PEL_VAL + (mv->col & 7 ? 1 : 0);
   const int row_min = (mv->row >> 3) - MAX_FULL_PEL_VAL + (mv->row & 7 ? 1 : 0);
   const int col_max = (mv->col >> 3) + MAX_FULL_PEL_VAL;
   const int row_max = (mv->row >> 3) + MAX_FULL_PEL_VAL;
   // Get intersection of UMV window and valid MV window to reduce # of checks
   // in diamond search.
   if (x->mv_col_min < col_min)
     x->mv_col_min = col_min;
   if (x->mv_col_max > col_max)
     x->mv_col_max = col_max;
   if (x->mv_row_min < row_min)
     x->mv_row_min = row_min;
   if (x->mv_row_max > row_max)
     x->mv_row_max = row_max;
 }
 int vp9_init_search_range(VP9_COMP *cpi, int size) {
   int sr = 0;
   // Minimum search size no matter what the passed in value.
   size = MAX(16, size);
   while ((size << sr) < MAX_FULL_PEL_VAL)
     sr++;
   if (sr)
     sr--;
   sr += cpi->sf.reduce_first_step_size;
   sr = MIN(sr, (cpi->sf.max_step_search_steps - 2));
   return sr;
 }
 static INLINE int mv_cost(const MV *mv,
                           const int *joint_cost, int *comp_cost[2]) {
   return joint_cost[vp9_get_mv_joint(mv)] +
              comp_cost[0][mv->row] + comp_cost[1][mv->col];
 }
 int vp9_mv_bit_cost(const MV *mv, const MV *ref,
                     const int *mvjcost, int *mvcost[2], int weight) {
   const MV diff = { mv->row - ref->row,
                     mv->col - ref->col };
   return ROUND_POWER_OF_TWO(mv_cost(&diff, mvjcost, mvcost) * weight, 7);
 }
 static int mv_err_cost(const MV *mv, const MV *ref,
                        const int *mvjcost, int *mvcost[2],
                        int error_per_bit) {
   if (mvcost) {
     const MV diff = { mv->row - ref->row,
                       mv->col - ref->col };
     return ROUND_POWER_OF_TWO(mv_cost(&diff, mvjcost, mvcost) *
                                   error_per_bit, 13);
   }
   return 0;
 }
 static int mvsad_err_cost(const MV *mv, const MV *ref,
                           const int *mvjsadcost, int *mvsadcost[2],
                           int error_per_bit) {
   if (mvsadcost) {
     const MV diff = { mv->row - ref->row,
                       mv->col - ref->col };
     return ROUND_POWER_OF_TWO(mv_cost(&diff, mvjsadcost, mvsadcost) *
                                   error_per_bit, 8);
   }
   return 0;
 }
 void vp9_init_dsmotion_compensation(MACROBLOCK *x, int stride) {
   int len;
   int search_site_count = 0;
   // Generate offsets for 4 search sites per step.
   x->ss[search_site_count].mv.col = 0;
   x->ss[search_site_count].mv.row = 0;
   x->ss[search_site_count].offset = 0;
   search_site_count++;
   for (len = MAX_FIRST_STEP; len > 0; len /= 2) {
     // Compute offsets for search sites.
     x->ss[search_site_count].mv.col = 0;
     x->ss[search_site_count].mv.row = -len;
     x->ss[search_site_count].offset = -len * stride;
     search_site_count++;
     // Compute offsets for search sites.
     x->ss[search_site_count].mv.col = 0;
     x->ss[search_site_count].mv.row = len;
     x->ss[search_site_count].offset = len * stride;
     search_site_count++;
     // Compute offsets for search sites.
     x->ss[search_site_count].mv.col = -len;
     x->ss[search_site_count].mv.row = 0;
     x->ss[search_site_count].offset = -len;
     search_site_count++;
     // Compute offsets for search sites.
     x->ss[search_site_count].mv.col = len;
     x->ss[search_site_count].mv.row = 0;
     x->ss[search_site_count].offset = len;
     search_site_count++;
   }
   x->ss_count = search_site_count;
   x->searches_per_step = 4;
 }
 void vp9_init3smotion_compensation(MACROBLOCK *x, int stride) {
   int len, ss_count = 1;
   x->ss[0].mv.col = x->ss[0].mv.row = 0;
   x->ss[0].offset = 0;
   for (len = MAX_FIRST_STEP; len > 0; len /= 2) {
     // Generate offsets for 8 search sites per step.
     const MV ss_mvs[8] = {
       {-len,  0  }, {len,  0  }, { 0,   -len}, {0,    len},
       {-len, -len}, {-len, len}, {len,  -len}, {len,  len}
     };
     int i;
     for (i = 0; i < 8; ++i) {
       search_site *const ss = &x->ss[ss_count++];
       ss->mv = ss_mvs[i];
       ss->offset = ss->mv.row * stride + ss->mv.col;
     }
   }
   x->ss_count = ss_count;
   x->searches_per_step = 8;
 }
 /*
  * To avoid the penalty for crossing cache-line read, preload the reference
  * area in a small buffer, which is aligned to make sure there won't be crossing
  * cache-line read while reading from this buffer. This reduced the cpu
  * cycles spent on reading ref data in sub-pixel filter functions.
  * TODO: Currently, since sub-pixel search range here is -3 ~ 3, copy 22 rows x
  * 32 cols area that is enough for 16x16 macroblock. Later, for SPLITMV, we
  * could reduce the area.
  */
 /* estimated cost of a motion vector (r,c) */
 #define MVC(r, c)                                       \
     (mvcost ?                                           \
      ((mvjcost[((r) != rr) * 2 + ((c) != rc)] +         \
        mvcost[0][((r) - rr)] + mvcost[1][((c) - rc)]) * \
       error_per_bit + 4096) >> 13 : 0)
 #define SP(x) (((x) & 7) << 1)  // convert motion vector component to offset
                                 // for svf calc
 #define IFMVCV(r, c, s, e)                                \
     if (c >= minc && c <= maxc && r >= minr && r <= maxr) \
       s                                                   \
     else                                                  \
       e;
 /* pointer to predictor base of a motionvector */
 #define PRE(r, c) (y + (((r) >> 3) * y_stride + ((c) >> 3) -(offset)))
 /* returns subpixel variance error function */
 #define DIST(r, c) \
     vfp->svf(PRE(r, c), y_stride, SP(c), SP(r), z, src_stride, &sse)
 /* checks if (r, c) has better score than previous best */
 #define CHECK_BETTER(v, r, c) \
     IFMVCV(r, c, {                                                       \
       thismse = (DIST(r, c));                                            \
       if ((v = MVC(r, c) + thismse) < besterr) {                         \
         besterr = v;                                                     \
         br = r;                                                          \
         bc = c;                                                          \
         *distortion = thismse;                                           \
         *sse1 = sse;                                                     \
       }                                                                  \
     },                                                                   \
     v = INT_MAX;)
 #define FIRST_LEVEL_CHECKS                              \
   {                                                     \
     unsigned int left, right, up, down, diag;           \
     CHECK_BETTER(left, tr, tc - hstep);                 \
     CHECK_BETTER(right, tr, tc + hstep);                \
     CHECK_BETTER(up, tr - hstep, tc);                   \
     CHECK_BETTER(down, tr + hstep, tc);                 \
     whichdir = (left < right ? 0 : 1) +                 \
                (up < down ? 0 : 2);                     \
     switch (whichdir) {                                 \
       case 0:                                           \
         CHECK_BETTER(diag, tr - hstep, tc - hstep);     \
         break;                                          \
       case 1:                                           \
         CHECK_BETTER(diag, tr - hstep, tc + hstep);     \
         break;                                          \
       case 2:                                           \
         CHECK_BETTER(diag, tr + hstep, tc - hstep);     \
         break;                                          \
       case 3:                                           \
         CHECK_BETTER(diag, tr + hstep, tc + hstep);     \
         break;                                          \
     }                                                   \
   }
 #define SECOND_LEVEL_CHECKS                             \
   {                                                     \
     int kr, kc;                                         \
     unsigned int second;                                \
     if (tr != br && tc != bc) {                         \
       kr = br - tr;                                     \
       kc = bc - tc;                                     \
       CHECK_BETTER(second, tr + kr, tc + 2 * kc);       \
       CHECK_BETTER(second, tr + 2 * kr, tc + kc);       \
     } else if (tr == br && tc != bc) {                  \
       kc = bc - tc;                                     \
       CHECK_BETTER(second, tr + hstep, tc + 2 * kc);    \
       CHECK_BETTER(second, tr - hstep, tc + 2 * kc);    \
       switch (whichdir) {                               \
         case 0:                                         \
         case 1:                                         \
           CHECK_BETTER(second, tr + hstep, tc + kc);    \
           break;                                        \
         case 2:                                         \
         case 3:                                         \
           CHECK_BETTER(second, tr - hstep, tc + kc);    \
           break;                                        \
       }                                                 \
     } else if (tr != br && tc == bc) {                  \
       kr = br - tr;                                     \
       CHECK_BETTER(second, tr + 2 * kr, tc + hstep);    \
       CHECK_BETTER(second, tr + 2 * kr, tc - hstep);    \
       switch (whichdir) {                               \
         case 0:                                         \
         case 2:                                         \
           CHECK_BETTER(second, tr + kr, tc + hstep);    \
           break;                                        \
         case 1:                                         \
         case 3:                                         \
           CHECK_BETTER(second, tr + kr, tc - hstep);    \
           break;                                        \
       }                                                 \
     }                                                   \
   }
 int vp9_find_best_sub_pixel_iterative(MACROBLOCK *x,
                                       MV *bestmv, const MV *ref_mv,
                                       int allow_hp,
                                       int error_per_bit,
                                       const vp9_variance_fn_ptr_t *vfp,
                                       int forced_stop,
                                       int iters_per_step,
                                       int *mvjcost, int *mvcost[2],
                                       int *distortion,
                                       unsigned int *sse1) {
   uint8_t *z = x->plane[0].src.buf;
   int src_stride = x->plane[0].src.stride;
   MACROBLOCKD *xd = &x->e_mbd;
   unsigned int besterr = INT_MAX;
   unsigned int sse;
   unsigned int whichdir;
   unsigned int halfiters = iters_per_step;
   unsigned int quarteriters = iters_per_step;
   unsigned int eighthiters = iters_per_step;
   int thismse;
   const int y_stride = xd->plane[0].pre[0].stride;
   const int offset = bestmv->row * y_stride + bestmv->col;
   uint8_t *y = xd->plane[0].pre[0].buf + offset;
   int rr = ref_mv->row;
   int rc = ref_mv->col;
   int br = bestmv->row * 8;
   int bc = bestmv->col * 8;
   int hstep = 4;
   const int minc = MAX(x->mv_col_min * 8, ref_mv->col - MV_MAX);
   const int maxc = MIN(x->mv_col_max * 8, ref_mv->col + MV_MAX);
   const int minr = MAX(x->mv_row_min * 8, ref_mv->row - MV_MAX);
   const int maxr = MIN(x->mv_row_max * 8, ref_mv->row + MV_MAX);
   int tr = br;
   int tc = bc;
   // central mv
   bestmv->row <<= 3;
   bestmv->col <<= 3;
   // calculate central point error
   besterr = vfp->vf(y, y_stride, z, src_stride, sse1);
   *distortion = besterr;
   besterr += mv_err_cost(bestmv, ref_mv, mvjcost, mvcost, error_per_bit);
   // TODO(jbb): Each subsequent iteration checks at least one point in
   // common with the last iteration could be 2 if diagonal is selected.
   while (halfiters--) {
     // 1/2 pel
     FIRST_LEVEL_CHECKS;
     // no reason to check the same one again.
     if (tr == br && tc == bc)
       break;
     tr = br;
     tc = bc;
   }
   // TODO(yaowu): Each subsequent iteration checks at least one point in common
   // with the last iteration could be 2 if diagonal is selected.
   // Note forced_stop: 0 - full, 1 - qtr only, 2 - half only
   if (forced_stop != 2) {
     hstep >>= 1;
     while (quarteriters--) {
       FIRST_LEVEL_CHECKS;
       // no reason to check the same one again.
       if (tr == br && tc == bc)
         break;
       tr = br;
       tc = bc;
     }
   }
   if (allow_hp && vp9_use_mv_hp(ref_mv) && forced_stop == 0) {
     hstep >>= 1;
     while (eighthiters--) {
       FIRST_LEVEL_CHECKS;
       // no reason to check the same one again.
       if (tr == br && tc == bc)
         break;
       tr = br;
       tc = bc;
     }
   }
   bestmv->row = br;
   bestmv->col = bc;
   if ((abs(bestmv->col - ref_mv->col) > (MAX_FULL_PEL_VAL << 3)) ||
       (abs(bestmv->row - ref_mv->row) > (MAX_FULL_PEL_VAL << 3)))
     return INT_MAX;
   return besterr;
 }
 int vp9_find_best_sub_pixel_tree(MACROBLOCK *x,
                                  MV *bestmv, const MV *ref_mv,
                                  int allow_hp,
                                  int error_per_bit,
                                  const vp9_variance_fn_ptr_t *vfp,
                                  int forced_stop,
                                  int iters_per_step,
                                  int *mvjcost, int *mvcost[2],
                                  int *distortion,
                                  unsigned int *sse1) {
   uint8_t *z = x->plane[0].src.buf;
   const int src_stride = x->plane[0].src.stride;
   MACROBLOCKD *xd = &x->e_mbd;
   unsigned int besterr = INT_MAX;
   unsigned int sse;
   unsigned int whichdir;
   int thismse;
   unsigned int halfiters = iters_per_step;
   unsigned int quarteriters = iters_per_step;
   unsigned int eighthiters = iters_per_step;
   const int y_stride = xd->plane[0].pre[0].stride;
   const int offset = bestmv->row * y_stride + bestmv->col;
   uint8_t *y = xd->plane[0].pre[0].buf + offset;
   int rr = ref_mv->row;
   int rc = ref_mv->col;
   int br = bestmv->row * 8;
   int bc = bestmv->col * 8;
   int hstep = 4;
   const int minc = MAX(x->mv_col_min * 8, ref_mv->col - MV_MAX);
   const int maxc = MIN(x->mv_col_max * 8, ref_mv->col + MV_MAX);
   const int minr = MAX(x->mv_row_min * 8, ref_mv->row - MV_MAX);
   const int maxr = MIN(x->mv_row_max * 8, ref_mv->row + MV_MAX);
   int tr = br;
   int tc = bc;
   // central mv
   bestmv->row *= 8;
   bestmv->col *= 8;
   // calculate central point error
   besterr = vfp->vf(y, y_stride, z, src_stride, sse1);
   *distortion = besterr;
   besterr += mv_err_cost(bestmv, ref_mv, mvjcost, mvcost, error_per_bit);
   // 1/2 pel
   FIRST_LEVEL_CHECKS;
   if (halfiters > 1) {
     SECOND_LEVEL_CHECKS;
   }
   tr = br;
   tc = bc;
   // Note forced_stop: 0 - full, 1 - qtr only, 2 - half only
   if (forced_stop != 2) {
     hstep >>= 1;
     FIRST_LEVEL_CHECKS;
     if (quarteriters > 1) {
       SECOND_LEVEL_CHECKS;
     }
     tr = br;
     tc = bc;
   }
   if (allow_hp && vp9_use_mv_hp(ref_mv) && forced_stop == 0) {
     hstep >>= 1;
     FIRST_LEVEL_CHECKS;
     if (eighthiters > 1) {
       SECOND_LEVEL_CHECKS;
     }
     tr = br;
     tc = bc;
   }
   bestmv->row = br;
   bestmv->col = bc;
   if ((abs(bestmv->col - ref_mv->col) > (MAX_FULL_PEL_VAL << 3)) ||
       (abs(bestmv->row - ref_mv->row) > (MAX_FULL_PEL_VAL << 3)))
     return INT_MAX;
   return besterr;
 }
 #undef DIST
 /* returns subpixel variance error function */
 #define DIST(r, c) \
     vfp->svaf(PRE(r, c), y_stride, SP(c), SP(r), \
               z, src_stride, &sse, second_pred)
 int vp9_find_best_sub_pixel_comp_iterative(MACROBLOCK *x,
                                            MV *bestmv, const MV *ref_mv,
                                            int allow_hp,
                                            int error_per_bit,
                                            const vp9_variance_fn_ptr_t *vfp,
                                            int forced_stop,
                                            int iters_per_step,
                                            int *mvjcost, int *mvcost[2],
                                            int *distortion,
                                            unsigned int *sse1,
                                            const uint8_t *second_pred,
                                            int w, int h) {
   uint8_t *const z = x->plane[0].src.buf;
   const int src_stride = x->plane[0].src.stride;
   MACROBLOCKD *const xd = &x->e_mbd;
   unsigned int besterr = INT_MAX;
   unsigned int sse;
   unsigned int whichdir;
   unsigned int halfiters = iters_per_step;
   unsigned int quarteriters = iters_per_step;
   unsigned int eighthiters = iters_per_step;
   int thismse;
   DECLARE_ALIGNED_ARRAY(16, uint8_t, comp_pred, 64 * 64);
   const int y_stride = xd->plane[0].pre[0].stride;
   const int offset = bestmv->row * y_stride + bestmv->col;
   uint8_t *const y = xd->plane[0].pre[0].buf + offset;
   int rr = ref_mv->row;
   int rc = ref_mv->col;
   int br = bestmv->row * 8;
   int bc = bestmv->col * 8;
   int hstep = 4;
   const int minc = MAX(x->mv_col_min * 8, ref_mv->col - MV_MAX);
   const int maxc = MIN(x->mv_col_max * 8, ref_mv->col + MV_MAX);
   const int minr = MAX(x->mv_row_min * 8, ref_mv->row - MV_MAX);
   const int maxr = MIN(x->mv_row_max * 8, ref_mv->row + MV_MAX);
   int tr = br;
   int tc = bc;
   // central mv
   bestmv->row *= 8;
   bestmv->col *= 8;
   // calculate central point error
   // TODO(yunqingwang): central pointer error was already calculated in full-
   // pixel search, and can be passed in this function.
   comp_avg_pred(comp_pred, second_pred, w, h, y, y_stride);
   besterr = vfp->vf(comp_pred, w, z, src_stride, sse1);
   *distortion = besterr;
   besterr += mv_err_cost(bestmv, ref_mv, mvjcost, mvcost, error_per_bit);
   // Each subsequent iteration checks at least one point in
   // common with the last iteration could be 2 ( if diag selected)
   while (halfiters--) {
     // 1/2 pel
     FIRST_LEVEL_CHECKS;
     // no reason to check the same one again.
     if (tr == br && tc == bc)
       break;
     tr = br;
     tc = bc;
   }
   // Each subsequent iteration checks at least one point in common with
   // the last iteration could be 2 ( if diag selected) 1/4 pel
   // Note forced_stop: 0 - full, 1 - qtr only, 2 - half only
   if (forced_stop != 2) {
     hstep >>= 1;
     while (quarteriters--) {
       FIRST_LEVEL_CHECKS;
       // no reason to check the same one again.
       if (tr == br && tc == bc)
         break;
       tr = br;
       tc = bc;
     }
   }
   if (allow_hp && vp9_use_mv_hp(ref_mv) && forced_stop == 0) {
     hstep >>= 1;
     while (eighthiters--) {
       FIRST_LEVEL_CHECKS;
       // no reason to check the same one again.
       if (tr == br && tc == bc)
         break;
       tr = br;
       tc = bc;
     }
   }
   bestmv->row = br;
   bestmv->col = bc;
   if ((abs(bestmv->col - ref_mv->col) > (MAX_FULL_PEL_VAL << 3)) ||
       (abs(bestmv->row - ref_mv->row) > (MAX_FULL_PEL_VAL << 3)))
     return INT_MAX;
   return besterr;
 }
 int vp9_find_best_sub_pixel_comp_tree(MACROBLOCK *x,
                                       MV *bestmv, const MV *ref_mv,
                                       int allow_hp,
                                       int error_per_bit,
                                       const vp9_variance_fn_ptr_t *vfp,
                                       int forced_stop,
                                       int iters_per_step,
                                       int *mvjcost, int *mvcost[2],
                                       int *distortion,
                                       unsigned int *sse1,
                                       const uint8_t *second_pred,
                                       int w, int h) {
   uint8_t *z = x->plane[0].src.buf;
   const int src_stride = x->plane[0].src.stride;
   MACROBLOCKD *xd = &x->e_mbd;
   unsigned int besterr = INT_MAX;
   unsigned int sse;
   unsigned int whichdir;
   int thismse;
   unsigned int halfiters = iters_per_step;
   unsigned int quarteriters = iters_per_step;
   unsigned int eighthiters = iters_per_step;
   DECLARE_ALIGNED_ARRAY(16, uint8_t, comp_pred, 64 * 64);
   const int y_stride = xd->plane[0].pre[0].stride;
   const int offset = bestmv->row * y_stride + bestmv->col;
   uint8_t *y = xd->plane[0].pre[0].buf + offset;
   int rr = ref_mv->row;
   int rc = ref_mv->col;
   int br = bestmv->row * 8;
   int bc = bestmv->col * 8;
   int hstep = 4;
   const int minc = MAX(x->mv_col_min * 8, ref_mv->col - MV_MAX);
   const int maxc = MIN(x->mv_col_max * 8, ref_mv->col + MV_MAX);
   const int minr = MAX(x->mv_row_min * 8, ref_mv->row - MV_MAX);
   const int maxr = MIN(x->mv_row_max * 8, ref_mv->row + MV_MAX);
   int tr = br;
   int tc = bc;
   // central mv
   bestmv->row *= 8;
   bestmv->col *= 8;
   // calculate central point error
   // TODO(yunqingwang): central pointer error was already calculated in full-
   // pixel search, and can be passed in this function.
   comp_avg_pred(comp_pred, second_pred, w, h, y, y_stride);
   besterr = vfp->vf(comp_pred, w, z, src_stride, sse1);
   *distortion = besterr;
   besterr += mv_err_cost(bestmv, ref_mv, mvjcost, mvcost, error_per_bit);
   // Each subsequent iteration checks at least one point in
   // common with the last iteration could be 2 ( if diag selected)
   // 1/2 pel
   FIRST_LEVEL_CHECKS;
   if (halfiters > 1) {
     SECOND_LEVEL_CHECKS;
   }
   tr = br;
   tc = bc;
   // Each subsequent iteration checks at least one point in common with
   // the last iteration could be 2 ( if diag selected) 1/4 pel
   // Note forced_stop: 0 - full, 1 - qtr only, 2 - half only
   if (forced_stop != 2) {
     hstep >>= 1;
     FIRST_LEVEL_CHECKS;
     if (quarteriters > 1) {
       SECOND_LEVEL_CHECKS;
     }
     tr = br;
     tc = bc;
   }
   if (allow_hp && vp9_use_mv_hp(ref_mv) && forced_stop == 0) {
     hstep >>= 1;
     FIRST_LEVEL_CHECKS;
     if (eighthiters > 1) {
       SECOND_LEVEL_CHECKS;
     }
     tr = br;
     tc = bc;
   }
   bestmv->row = br;
   bestmv->col = bc;
   if ((abs(bestmv->col - ref_mv->col) > (MAX_FULL_PEL_VAL << 3)) ||
       (abs(bestmv->row - ref_mv->row) > (MAX_FULL_PEL_VAL << 3)))
     return INT_MAX;
   return besterr;
 }
 #undef MVC
 #undef PRE
 #undef DIST
 #undef IFMVCV
 #undef CHECK_BETTER
 #undef SP
 #define CHECK_BOUNDS(range) \
   {\
     all_in = 1;\
     all_in &= ((br-range) >= x->mv_row_min);\
     all_in &= ((br+range) <= x->mv_row_max);\
     all_in &= ((bc-range) >= x->mv_col_min);\
     all_in &= ((bc+range) <= x->mv_col_max);\
   }
 #define CHECK_POINT \
   {\
     if (this_mv.col < x->mv_col_min) continue;\
     if (this_mv.col > x->mv_col_max) continue;\
     if (this_mv.row < x->mv_row_min) continue;\
     if (this_mv.row > x->mv_row_max) continue;\
   }
 #define CHECK_BETTER \
   {\
     if (thissad < bestsad)\
     {\
       if (use_mvcost) \
         thissad += mvsad_err_cost(&this_mv, &fcenter_mv.as_mv, \
                                   mvjsadcost, mvsadcost, \
                                   sad_per_bit);\
       if (thissad < bestsad)\
       {\
         bestsad = thissad;\
         best_site = i;\
       }\
     }\
   }
 #define get_next_chkpts(list, i, n)   \
     list[0] = ((i) == 0 ? (n) - 1 : (i) - 1);  \
     list[1] = (i);                             \
     list[2] = ((i) == (n) - 1 ? 0 : (i) + 1);
 #define MAX_PATTERN_SCALES         11
 #define MAX_PATTERN_CANDIDATES      8  // max number of canddiates per scale
 #define PATTERN_CANDIDATES_REF      3  // number of refinement candidates
 // Generic pattern search function that searches over multiple scales.
 // Each scale can have a different number of candidates and shape of
 // candidates as indicated in the num_candidates and candidates arrays
 // passed into this function
 static int vp9_pattern_search(MACROBLOCK *x,
                               MV *ref_mv,
                               int search_param,
                               int sad_per_bit,
                               int do_init_search,
                               int do_refine,
                               const vp9_variance_fn_ptr_t *vfp,
                               int use_mvcost,
                               const MV *center_mv, MV *best_mv,
                               const int num_candidates[MAX_PATTERN_SCALES],
                               const MV candidates[MAX_PATTERN_SCALES]
                                                  [MAX_PATTERN_CANDIDATES]) {
   const MACROBLOCKD* const xd = &x->e_mbd;
   static const int search_param_to_steps[MAX_MVSEARCH_STEPS] = {
 , 9, 8, 7, 6, 5, 4, 3, 2, 1, 0,
   };
   int i, j, s, t;
   uint8_t *what = x->plane[0].src.buf;
   int what_stride = x->plane[0].src.stride;
   int in_what_stride = xd->plane[0].pre[0].stride;
   int br, bc;
   MV this_mv;
   int bestsad = INT_MAX;
   int thissad;
   uint8_t *base_offset;
   uint8_t *this_offset;
   int k = -1;
   int all_in;
   int best_site = -1;
   int_mv fcenter_mv;
   int best_init_s = search_param_to_steps[search_param];
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->row >> 3;
   fcenter_mv.as_mv.col = center_mv->col >> 3;
   // adjust ref_mv to make sure it is within MV range
   clamp_mv(ref_mv, x->mv_col_min, x->mv_col_max, x->mv_row_min, x->mv_row_max);
   br = ref_mv->row;
   bc = ref_mv->col;
   // Work out the start point for the search
   base_offset = (uint8_t *)(xd->plane[0].pre[0].buf);
   this_offset = base_offset + (br * in_what_stride) + bc;
   this_mv.row = br;
   this_mv.col = bc;
   bestsad = vfp->sdf(what, what_stride, this_offset, in_what_stride, 0x7fffffff)
                 + mvsad_err_cost(&this_mv, &fcenter_mv.as_mv,
                                  mvjsadcost, mvsadcost, sad_per_bit);
   // Search all possible scales upto the search param around the center point
   // pick the scale of the point that is best as the starting scale of
   // further steps around it.
   if (do_init_search) {
     s = best_init_s;
     best_init_s = -1;
     for (t = 0; t <= s; ++t) {
       best_site = -1;
       CHECK_BOUNDS((1 << t))
       if (all_in) {
         for (i = 0; i < num_candidates[t]; i++) {
           this_mv.row = br + candidates[t][i].row;
           this_mv.col = bc + candidates[t][i].col;
           this_offset = base_offset + (this_mv.row * in_what_stride) +
                                        this_mv.col;
           thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride,
                              bestsad);
           CHECK_BETTER
         }
       } else {
         for (i = 0; i < num_candidates[t]; i++) {
           this_mv.row = br + candidates[t][i].row;
           this_mv.col = bc + candidates[t][i].col;
           CHECK_POINT
           this_offset = base_offset + (this_mv.row * in_what_stride) +
                                        this_mv.col;
           thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride,
                              bestsad);
           CHECK_BETTER
         }
       }
       if (best_site == -1) {
         continue;
       } else {
         best_init_s = t;
         k = best_site;
       }
     }
     if (best_init_s != -1) {
       br += candidates[best_init_s][k].row;
       bc += candidates[best_init_s][k].col;
     }
   }
   // If the center point is still the best, just skip this and move to
   // the refinement step.
   if (best_init_s != -1) {
     s = best_init_s;
     best_site = -1;
     do {
       // No need to search all 6 points the 1st time if initial search was used
       if (!do_init_search || s != best_init_s) {
         CHECK_BOUNDS((1 << s))
         if (all_in) {
           for (i = 0; i < num_candidates[s]; i++) {
             this_mv.row = br + candidates[s][i].row;
             this_mv.col = bc + candidates[s][i].col;
             this_offset = base_offset + (this_mv.row * in_what_stride) +
                                          this_mv.col;
             thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride,
                                bestsad);
             CHECK_BETTER
           }
         } else {
           for (i = 0; i < num_candidates[s]; i++) {
             this_mv.row = br + candidates[s][i].row;
             this_mv.col = bc + candidates[s][i].col;
             CHECK_POINT
             this_offset = base_offset + (this_mv.row * in_what_stride) +
                                          this_mv.col;
             thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride,
                                bestsad);
             CHECK_BETTER
           }
         }
         if (best_site == -1) {
           continue;
         } else {
           br += candidates[s][best_site].row;
           bc += candidates[s][best_site].col;
           k = best_site;
         }
       }
       do {
         int next_chkpts_indices[PATTERN_CANDIDATES_REF];
         best_site = -1;
         CHECK_BOUNDS((1 << s))
         get_next_chkpts(next_chkpts_indices, k, num_candidates[s]);
         if (all_in) {
           for (i = 0; i < PATTERN_CANDIDATES_REF; i++) {
             this_mv.row = br + candidates[s][next_chkpts_indices[i]].row;
             this_mv.col = bc + candidates[s][next_chkpts_indices[i]].col;
             this_offset = base_offset + (this_mv.row * (in_what_stride)) +
                                          this_mv.col;
             thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride,
                                bestsad);
             CHECK_BETTER
           }
         } else {
           for (i = 0; i < PATTERN_CANDIDATES_REF; i++) {
             this_mv.row = br + candidates[s][next_chkpts_indices[i]].row;
             this_mv.col = bc + candidates[s][next_chkpts_indices[i]].col;
             CHECK_POINT
             this_offset = base_offset + (this_mv.row * (in_what_stride)) +
                                          this_mv.col;
             thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride,
                                bestsad);
             CHECK_BETTER
           }
         }
         if (best_site != -1) {
           k = next_chkpts_indices[best_site];
           br += candidates[s][k].row;
           bc += candidates[s][k].col;
         }
       } while (best_site != -1);
     } while (s--);
   }
   // Check 4 1-away neighbors if do_refine is true.
   // For most well-designed schemes do_refine will not be necessary.
   if (do_refine) {
     static const MV neighbors[4] = {
       {0, -1}, { -1, 0}, {1, 0}, {0, 1},
     };
     for (j = 0; j < 16; j++) {
       best_site = -1;
       CHECK_BOUNDS(1)
       if (all_in) {
         for (i = 0; i < 4; i++) {
           this_mv.row = br + neighbors[i].row;
           this_mv.col = bc + neighbors[i].col;
           this_offset = base_offset + (this_mv.row * (in_what_stride)) +
                                        this_mv.col;
           thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride,
                              bestsad);
           CHECK_BETTER
         }
       } else {
         for (i = 0; i < 4; i++) {
           this_mv.row = br + neighbors[i].row;
           this_mv.col = bc + neighbors[i].col;
           CHECK_POINT
           this_offset = base_offset + (this_mv.row * (in_what_stride)) +
                                        this_mv.col;
           thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride,
                              bestsad);
           CHECK_BETTER
         }
           }
       if (best_site == -1) {
         break;
       } else {
         br += neighbors[best_site].row;
         bc += neighbors[best_site].col;
       }
     }
   }
   best_mv->row = br;
   best_mv->col = bc;
   this_offset = base_offset + (best_mv->row * in_what_stride) +
                                best_mv->col;
   this_mv.row = best_mv->row * 8;
   this_mv.col = best_mv->col * 8;
   if (bestsad == INT_MAX)
     return INT_MAX;
   return vfp->vf(what, what_stride, this_offset, in_what_stride,
                  (unsigned int *)&bestsad) +
          use_mvcost ? mv_err_cost(&this_mv, center_mv,
                                   x->nmvjointcost, x->mvcost, x->errorperbit)
                     : 0;
 }
 int vp9_hex_search(MACROBLOCK *x,
                    MV *ref_mv,
                    int search_param,
                    int sad_per_bit,
                    int do_init_search,
                    const vp9_variance_fn_ptr_t *vfp,
                    int use_mvcost,
                    const MV *center_mv, MV *best_mv) {
   // First scale has 8-closest points, the rest have 6 points in hex shape
   // at increasing scales
   static const int hex_num_candidates[MAX_PATTERN_SCALES] = {
 , 6, 6, 6, 6, 6, 6, 6, 6, 6, 6
   };
   // Note that the largest candidate step at each scale is 2^scale
   static const MV hex_candidates[MAX_PATTERN_SCALES][MAX_PATTERN_CANDIDATES] = {
     {{-1, -1}, {0, -1}, {1, -1}, {1, 0}, {1, 1}, { 0, 1}, { -1, 1}, {-1, 0}},
     {{-1, -2}, {1, -2}, {2, 0}, {1, 2}, { -1, 2}, { -2, 0}},
     {{-2, -4}, {2, -4}, {4, 0}, {2, 4}, { -2, 4}, { -4, 0}},
     {{-4, -8}, {4, -8}, {8, 0}, {4, 8}, { -4, 8}, { -8, 0}},
     {{-8, -16}, {8, -16}, {16, 0}, {8, 16}, { -8, 16}, { -16, 0}},
     {{-16, -32}, {16, -32}, {32, 0}, {16, 32}, { -16, 32}, { -32, 0}},
     {{-32, -64}, {32, -64}, {64, 0}, {32, 64}, { -32, 64}, { -64, 0}},
     {{-64, -128}, {64, -128}, {128, 0}, {64, 128}, { -64, 128}, { -128, 0}},
     {{-128, -256}, {128, -256}, {256, 0}, {128, 256}, { -128, 256}, { -256, 0}},
     {{-256, -512}, {256, -512}, {512, 0}, {256, 512}, { -256, 512}, { -512, 0}},
     {{-512, -1024}, {512, -1024}, {1024, 0}, {512, 1024}, { -512, 1024},
       { -1024, 0}},
   };
   return
       vp9_pattern_search(x, ref_mv, search_param, sad_per_bit,
                          do_init_search, 0, vfp, use_mvcost,
                          center_mv, best_mv,
                          hex_num_candidates, hex_candidates);
 }
 int vp9_bigdia_search(MACROBLOCK *x,
                       MV *ref_mv,
                       int search_param,
                       int sad_per_bit,
                       int do_init_search,
                       const vp9_variance_fn_ptr_t *vfp,
                       int use_mvcost,
                       const MV *center_mv,
                       MV *best_mv) {
   // First scale has 4-closest points, the rest have 8 points in diamond
   // shape at increasing scales
   static const int bigdia_num_candidates[MAX_PATTERN_SCALES] = {
 , 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
   };
   // Note that the largest candidate step at each scale is 2^scale
   static const MV bigdia_candidates[MAX_PATTERN_SCALES]
                                    [MAX_PATTERN_CANDIDATES] = {
     {{0, -1}, {1, 0}, { 0, 1}, {-1, 0}},
     {{-1, -1}, {0, -2}, {1, -1}, {2, 0}, {1, 1}, {0, 2}, {-1, 1}, {-2, 0}},
     {{-2, -2}, {0, -4}, {2, -2}, {4, 0}, {2, 2}, {0, 4}, {-2, 2}, {-4, 0}},
     {{-4, -4}, {0, -8}, {4, -4}, {8, 0}, {4, 4}, {0, 8}, {-4, 4}, {-8, 0}},
     {{-8, -8}, {0, -16}, {8, -8}, {16, 0}, {8, 8}, {0, 16}, {-8, 8}, {-16, 0}},
     {{-16, -16}, {0, -32}, {16, -16}, {32, 0}, {16, 16}, {0, 32},
       {-16, 16}, {-32, 0}},
     {{-32, -32}, {0, -64}, {32, -32}, {64, 0}, {32, 32}, {0, 64},
       {-32, 32}, {-64, 0}},
     {{-64, -64}, {0, -128}, {64, -64}, {128, 0}, {64, 64}, {0, 128},
       {-64, 64}, {-128, 0}},
     {{-128, -128}, {0, -256}, {128, -128}, {256, 0}, {128, 128}, {0, 256},
       {-128, 128}, {-256, 0}},
     {{-256, -256}, {0, -512}, {256, -256}, {512, 0}, {256, 256}, {0, 512},
       {-256, 256}, {-512, 0}},
     {{-512, -512}, {0, -1024}, {512, -512}, {1024, 0}, {512, 512}, {0, 1024},
       {-512, 512}, {-1024, 0}},
   };
   return vp9_pattern_search(x, ref_mv, search_param, sad_per_bit,
                             do_init_search, 0, vfp, use_mvcost,
                             center_mv, best_mv,
                             bigdia_num_candidates, bigdia_candidates);
 }
 int vp9_square_search(MACROBLOCK *x,
                       MV *ref_mv,
                       int search_param,
                       int sad_per_bit,
                       int do_init_search,
                       const vp9_variance_fn_ptr_t *vfp,
                       int use_mvcost,
                       const MV *center_mv,
                       MV *best_mv) {
   // All scales have 8 closest points in square shape
   static const int square_num_candidates[MAX_PATTERN_SCALES] = {
 , 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
   };
   // Note that the largest candidate step at each scale is 2^scale
   static const MV square_candidates[MAX_PATTERN_SCALES]
                                    [MAX_PATTERN_CANDIDATES] = {
     {{-1, -1}, {0, -1}, {1, -1}, {1, 0}, {1, 1}, {0, 1}, {-1, 1}, {-1, 0}},
     {{-2, -2}, {0, -2}, {2, -2}, {2, 0}, {2, 2}, {0, 2}, {-2, 2}, {-2, 0}},
     {{-4, -4}, {0, -4}, {4, -4}, {4, 0}, {4, 4}, {0, 4}, {-4, 4}, {-4, 0}},
     {{-8, -8}, {0, -8}, {8, -8}, {8, 0}, {8, 8}, {0, 8}, {-8, 8}, {-8, 0}},
     {{-16, -16}, {0, -16}, {16, -16}, {16, 0}, {16, 16}, {0, 16},
       {-16, 16}, {-16, 0}},
     {{-32, -32}, {0, -32}, {32, -32}, {32, 0}, {32, 32}, {0, 32},
       {-32, 32}, {-32, 0}},
     {{-64, -64}, {0, -64}, {64, -64}, {64, 0}, {64, 64}, {0, 64},
       {-64, 64}, {-64, 0}},
     {{-128, -128}, {0, -128}, {128, -128}, {128, 0}, {128, 128}, {0, 128},
       {-128, 128}, {-128, 0}},
     {{-256, -256}, {0, -256}, {256, -256}, {256, 0}, {256, 256}, {0, 256},
       {-256, 256}, {-256, 0}},
     {{-512, -512}, {0, -512}, {512, -512}, {512, 0}, {512, 512}, {0, 512},
       {-512, 512}, {-512, 0}},
     {{-1024, -1024}, {0, -1024}, {1024, -1024}, {1024, 0}, {1024, 1024},
       {0, 1024}, {-1024, 1024}, {-1024, 0}},
   };
   return vp9_pattern_search(x, ref_mv, search_param, sad_per_bit,
                             do_init_search, 0, vfp, use_mvcost,
                             center_mv, best_mv,
                             square_num_candidates, square_candidates);
 };
 #undef CHECK_BOUNDS
 #undef CHECK_POINT
 #undef CHECK_BETTER
 int vp9_diamond_search_sad_c(MACROBLOCK *x,
                              int_mv *ref_mv, int_mv *best_mv,
                              int search_param, int sad_per_bit, int *num00,
                              vp9_variance_fn_ptr_t *fn_ptr, int *mvjcost,
                              int *mvcost[2], int_mv *center_mv) {
   int i, j, step;
   const MACROBLOCKD* const xd = &x->e_mbd;
   uint8_t *what = x->plane[0].src.buf;
   int what_stride = x->plane[0].src.stride;
   uint8_t *in_what;
   int in_what_stride = xd->plane[0].pre[0].stride;
   uint8_t *best_address;
   int tot_steps;
   int_mv this_mv;
   int bestsad = INT_MAX;
   int best_site = 0;
   int last_site = 0;
   int ref_row, ref_col;
   int this_row_offset, this_col_offset;
   search_site *ss;
   uint8_t *check_here;
   int thissad;
   int_mv fcenter_mv;
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
   fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;
   clamp_mv(&ref_mv->as_mv,
            x->mv_col_min, x->mv_col_max, x->mv_row_min, x->mv_row_max);
   ref_row = ref_mv->as_mv.row;
   ref_col = ref_mv->as_mv.col;
   *num00 = 0;
   best_mv->as_mv.row = ref_row;
   best_mv->as_mv.col = ref_col;
   // Work out the start point for the search
   in_what = (uint8_t *)(xd->plane[0].pre[0].buf +
                         (ref_row * (xd->plane[0].pre[0].stride)) + ref_col);
   best_address = in_what;
   // Check the starting position
   bestsad = fn_ptr->sdf(what, what_stride, in_what, in_what_stride, 0x7fffffff)
                 + mvsad_err_cost(&best_mv->as_mv, &fcenter_mv.as_mv,
                                  mvjsadcost, mvsadcost, sad_per_bit);
   // search_param determines the length of the initial step and hence the number
   // of iterations
   // 0 = initial step (MAX_FIRST_STEP) pel : 1 = (MAX_FIRST_STEP/2) pel, 2 =
   // (MAX_FIRST_STEP/4) pel... etc.
   ss = &x->ss[search_param * x->searches_per_step];
   tot_steps = (x->ss_count / x->searches_per_step) - search_param;
   i = 1;
   for (step = 0; step < tot_steps; step++) {
     for (j = 0; j < x->searches_per_step; j++) {
       // Trap illegal vectors
       this_row_offset = best_mv->as_mv.row + ss[i].mv.row;
       this_col_offset = best_mv->as_mv.col + ss[i].mv.col;
       if ((this_col_offset > x->mv_col_min) &&
           (this_col_offset < x->mv_col_max) &&
           (this_row_offset > x->mv_row_min) &&
           (this_row_offset < x->mv_row_max)) {
         check_here = ss[i].offset + best_address;
         thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                               bestsad);
         if (thissad < bestsad) {
           this_mv.as_mv.row = this_row_offset;
           this_mv.as_mv.col = this_col_offset;
           thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                     mvjsadcost, mvsadcost, sad_per_bit);
           if (thissad < bestsad) {
             bestsad = thissad;
             best_site = i;
           }
         }
       }
       i++;
     }
     if (best_site != last_site) {
       best_mv->as_mv.row += ss[best_site].mv.row;
       best_mv->as_mv.col += ss[best_site].mv.col;
       best_address += ss[best_site].offset;
       last_site = best_site;
 #if defined(NEW_DIAMOND_SEARCH)
       while (1) {
         this_row_offset = best_mv->as_mv.row + ss[best_site].mv.row;
         this_col_offset = best_mv->as_mv.col + ss[best_site].mv.col;
         if ((this_col_offset > x->mv_col_min) &&
             (this_col_offset < x->mv_col_max) &&
             (this_row_offset > x->mv_row_min) &&
             (this_row_offset < x->mv_row_max)) {
           check_here = ss[best_site].offset + best_address;
           thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                                 bestsad);
           if (thissad < bestsad) {
             this_mv.as_mv.row = this_row_offset;
             this_mv.as_mv.col = this_col_offset;
             thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                       mvjsadcost, mvsadcost, sad_per_bit);
             if (thissad < bestsad) {
               bestsad = thissad;
               best_mv->as_mv.row += ss[best_site].mv.row;
               best_mv->as_mv.col += ss[best_site].mv.col;
               best_address += ss[best_site].offset;
               continue;
             }
           }
         }
         break;
       };
 #endif
     } else if (best_address == in_what) {
       (*num00)++;
     }
   }
   this_mv.as_mv.row = best_mv->as_mv.row * 8;
   this_mv.as_mv.col = best_mv->as_mv.col * 8;
   if (bestsad == INT_MAX)
     return INT_MAX;
   return fn_ptr->vf(what, what_stride, best_address, in_what_stride,
                     (unsigned int *)(&thissad)) +
                        mv_err_cost(&this_mv.as_mv, &center_mv->as_mv,
                                    mvjcost, mvcost, x->errorperbit);
 }
 int vp9_diamond_search_sadx4(MACROBLOCK *x,
                              int_mv *ref_mv, int_mv *best_mv, int search_param,
                              int sad_per_bit, int *num00,
                              vp9_variance_fn_ptr_t *fn_ptr,
                              int *mvjcost, int *mvcost[2], int_mv *center_mv) {
   int i, j, step;
   const MACROBLOCKD* const xd = &x->e_mbd;
   uint8_t *what = x->plane[0].src.buf;
   int what_stride = x->plane[0].src.stride;
   uint8_t *in_what;
   int in_what_stride = xd->plane[0].pre[0].stride;
   uint8_t *best_address;
   int tot_steps;
   int_mv this_mv;
   unsigned int bestsad = INT_MAX;
   int best_site = 0;
   int last_site = 0;
   int ref_row;
   int ref_col;
   int this_row_offset;
   int this_col_offset;
   search_site *ss;
   uint8_t *check_here;
   unsigned int thissad;
   int_mv fcenter_mv;
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
   fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;
   clamp_mv(&ref_mv->as_mv,
            x->mv_col_min, x->mv_col_max, x->mv_row_min, x->mv_row_max);
   ref_row = ref_mv->as_mv.row;
   ref_col = ref_mv->as_mv.col;
   *num00 = 0;
   best_mv->as_mv.row = ref_row;
   best_mv->as_mv.col = ref_col;
   // Work out the start point for the search
   in_what = (uint8_t *)(xd->plane[0].pre[0].buf +
                         (ref_row * (xd->plane[0].pre[0].stride)) + ref_col);
   best_address = in_what;
   // Check the starting position
   bestsad = fn_ptr->sdf(what, what_stride, in_what, in_what_stride, 0x7fffffff)
                 + mvsad_err_cost(&best_mv->as_mv, &fcenter_mv.as_mv,
                                  mvjsadcost, mvsadcost, sad_per_bit);
   // search_param determines the length of the initial step and hence the number
   // of iterations.
   // 0 = initial step (MAX_FIRST_STEP) pel
   // 1 = (MAX_FIRST_STEP/2) pel,
   // 2 = (MAX_FIRST_STEP/4) pel...
   ss = &x->ss[search_param * x->searches_per_step];
   tot_steps = (x->ss_count / x->searches_per_step) - search_param;
   i = 1;
   for (step = 0; step < tot_steps; step++) {
     int all_in = 1, t;
     // All_in is true if every one of the points we are checking are within
     // the bounds of the image.
     all_in &= ((best_mv->as_mv.row + ss[i].mv.row) > x->mv_row_min);
     all_in &= ((best_mv->as_mv.row + ss[i + 1].mv.row) < x->mv_row_max);
     all_in &= ((best_mv->as_mv.col + ss[i + 2].mv.col) > x->mv_col_min);
     all_in &= ((best_mv->as_mv.col + ss[i + 3].mv.col) < x->mv_col_max);
     // If all the pixels are within the bounds we don't check whether the
     // search point is valid in this loop,  otherwise we check each point
     // for validity..
     if (all_in) {
       unsigned int sad_array[4];
       for (j = 0; j < x->searches_per_step; j += 4) {
         unsigned char const *block_offset[4];
         for (t = 0; t < 4; t++)
           block_offset[t] = ss[i + t].offset + best_address;
         fn_ptr->sdx4df(what, what_stride, block_offset, in_what_stride,
                        sad_array);
         for (t = 0; t < 4; t++, i++) {
           if (sad_array[t] < bestsad) {
             this_mv.as_mv.row = best_mv->as_mv.row + ss[i].mv.row;
             this_mv.as_mv.col = best_mv->as_mv.col + ss[i].mv.col;
             sad_array[t] += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                            mvjsadcost, mvsadcost, sad_per_bit);
             if (sad_array[t] < bestsad) {
               bestsad = sad_array[t];
               best_site = i;
             }
           }
         }
       }
     } else {
       for (j = 0; j < x->searches_per_step; j++) {
         // Trap illegal vectors
         this_row_offset = best_mv->as_mv.row + ss[i].mv.row;
         this_col_offset = best_mv->as_mv.col + ss[i].mv.col;
         if ((this_col_offset > x->mv_col_min) &&
             (this_col_offset < x->mv_col_max) &&
             (this_row_offset > x->mv_row_min) &&
             (this_row_offset < x->mv_row_max)) {
           check_here = ss[i].offset + best_address;
           thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                                 bestsad);
           if (thissad < bestsad) {
             this_mv.as_mv.row = this_row_offset;
             this_mv.as_mv.col = this_col_offset;
             thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                       mvjsadcost, mvsadcost, sad_per_bit);
             if (thissad < bestsad) {
               bestsad = thissad;
               best_site = i;
             }
           }
         }
         i++;
       }
     }
     if (best_site != last_site) {
       best_mv->as_mv.row += ss[best_site].mv.row;
       best_mv->as_mv.col += ss[best_site].mv.col;
       best_address += ss[best_site].offset;
       last_site = best_site;
 #if defined(NEW_DIAMOND_SEARCH)
       while (1) {
         this_row_offset = best_mv->as_mv.row + ss[best_site].mv.row;
         this_col_offset = best_mv->as_mv.col + ss[best_site].mv.col;
         if ((this_col_offset > x->mv_col_min) &&
             (this_col_offset < x->mv_col_max) &&
             (this_row_offset > x->mv_row_min) &&
             (this_row_offset < x->mv_row_max)) {
           check_here = ss[best_site].offset + best_address;
           thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                                 bestsad);
           if (thissad < bestsad) {
             this_mv.as_mv.row = this_row_offset;
             this_mv.as_mv.col = this_col_offset;
             thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                       mvjsadcost, mvsadcost, sad_per_bit);
             if (thissad < bestsad) {
               bestsad = thissad;
               best_mv->as_mv.row += ss[best_site].mv.row;
               best_mv->as_mv.col += ss[best_site].mv.col;
               best_address += ss[best_site].offset;
               continue;
             }
           }
         }
         break;
       };
 #endif
     } else if (best_address == in_what) {
       (*num00)++;
     }
   }
   this_mv.as_mv.row = best_mv->as_mv.row * 8;
   this_mv.as_mv.col = best_mv->as_mv.col * 8;
   if (bestsad == INT_MAX)
     return INT_MAX;
   return fn_ptr->vf(what, what_stride, best_address, in_what_stride,
                     (unsigned int *)(&thissad)) +
                     mv_err_cost(&this_mv.as_mv, &center_mv->as_mv,
                                 mvjcost, mvcost, x->errorperbit);
 }
 /* do_refine: If last step (1-away) of n-step search doesn't pick the center
               point as the best match, we will do a final 1-away diamond
               refining search  */
 int vp9_full_pixel_diamond(VP9_COMP *cpi, MACROBLOCK *x,
                            int_mv *mvp_full, int step_param,
                            int sadpb, int further_steps,
                            int do_refine, vp9_variance_fn_ptr_t *fn_ptr,
                            int_mv *ref_mv, int_mv *dst_mv) {
   int_mv temp_mv;
   int thissme, n, num00;
   int bestsme = cpi->diamond_search_sad(x, mvp_full, &temp_mv,
                                         step_param, sadpb, &num00,
                                         fn_ptr, x->nmvjointcost,
                                         x->mvcost, ref_mv);
   dst_mv->as_int = temp_mv.as_int;
   n = num00;
   num00 = 0;
   /* If there won't be more n-step search, check to see if refining search is
    * needed. */
   if (n > further_steps)
     do_refine = 0;
   while (n < further_steps) {
     n++;
     if (num00) {
       num00--;
     } else {
       thissme = cpi->diamond_search_sad(x, mvp_full, &temp_mv,
                                         step_param + n, sadpb, &num00,
                                         fn_ptr, x->nmvjointcost, x->mvcost,
                                         ref_mv);
       /* check to see if refining search is needed. */
       if (num00 > (further_steps - n))
         do_refine = 0;
       if (thissme < bestsme) {
         bestsme = thissme;
         dst_mv->as_int = temp_mv.as_int;
       }
     }
   }
   /* final 1-away diamond refining search */
   if (do_refine == 1) {
     int search_range = 8;
     int_mv best_mv;
     best_mv.as_int = dst_mv->as_int;
     thissme = cpi->refining_search_sad(x, &best_mv, sadpb, search_range,
                                        fn_ptr, x->nmvjointcost, x->mvcost,
                                        ref_mv);
     if (thissme < bestsme) {
       bestsme = thissme;
       dst_mv->as_int = best_mv.as_int;
     }
   }
   return bestsme;
 }
 int vp9_full_search_sad_c(MACROBLOCK *x, int_mv *ref_mv,
                           int sad_per_bit, int distance,
                           vp9_variance_fn_ptr_t *fn_ptr, int *mvjcost,
                           int *mvcost[2],
                           int_mv *center_mv, int n) {
   const MACROBLOCKD* const xd = &x->e_mbd;
   uint8_t *what = x->plane[0].src.buf;
   int what_stride = x->plane[0].src.stride;
   uint8_t *in_what;
   int in_what_stride = xd->plane[0].pre[0].stride;
   int mv_stride = xd->plane[0].pre[0].stride;
   uint8_t *bestaddress;
   int_mv *best_mv = &x->e_mbd.mi_8x8[0]->bmi[n].as_mv[0];
   int_mv this_mv;
   int bestsad = INT_MAX;
   int r, c;
   uint8_t *check_here;
   int thissad;
   int ref_row = ref_mv->as_mv.row;
   int ref_col = ref_mv->as_mv.col;
   int row_min = ref_row - distance;
   int row_max = ref_row + distance;
   int col_min = ref_col - distance;
   int col_max = ref_col + distance;
   int_mv fcenter_mv;
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
   fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;
   // Work out the mid point for the search
   in_what = xd->plane[0].pre[0].buf;
   bestaddress = in_what + (ref_row * xd->plane[0].pre[0].stride) + ref_col;
   best_mv->as_mv.row = ref_row;
   best_mv->as_mv.col = ref_col;
   // Baseline value at the centre
   bestsad = fn_ptr->sdf(what, what_stride, bestaddress,
                         in_what_stride, 0x7fffffff)
                            + mvsad_err_cost(&best_mv->as_mv, &fcenter_mv.as_mv,
                                             mvjsadcost, mvsadcost, sad_per_bit);
   // Apply further limits to prevent us looking using vectors that stretch
   // beyond the UMV border
   col_min = MAX(col_min, x->mv_col_min);
   col_max = MIN(col_max, x->mv_col_max);
   row_min = MAX(row_min, x->mv_row_min);
   row_max = MIN(row_max, x->mv_row_max);
   for (r = row_min; r < row_max; r++) {
     this_mv.as_mv.row = r;
     check_here = r * mv_stride + in_what + col_min;
     for (c = col_min; c < col_max; c++) {
       thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                             bestsad);
       this_mv.as_mv.col = c;
       thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                 mvjsadcost, mvsadcost, sad_per_bit);
       if (thissad < bestsad) {
         bestsad = thissad;
         best_mv->as_mv.row = r;
         best_mv->as_mv.col = c;
         bestaddress = check_here;
       }
       check_here++;
     }
   }
   this_mv.as_mv.row = best_mv->as_mv.row * 8;
   this_mv.as_mv.col = best_mv->as_mv.col * 8;
   if (bestsad < INT_MAX)
     return fn_ptr->vf(what, what_stride, bestaddress, in_what_stride,
                       (unsigned int *)(&thissad)) +
                       mv_err_cost(&this_mv.as_mv, &center_mv->as_mv,
                                   mvjcost, mvcost, x->errorperbit);
   else
     return INT_MAX;
 }
 int vp9_full_search_sadx3(MACROBLOCK *x, int_mv *ref_mv,
                           int sad_per_bit, int distance,
                           vp9_variance_fn_ptr_t *fn_ptr, int *mvjcost,
                           int *mvcost[2], int_mv *center_mv, int n) {
   const MACROBLOCKD* const xd = &x->e_mbd;
   uint8_t *what = x->plane[0].src.buf;
   int what_stride = x->plane[0].src.stride;
   uint8_t *in_what;
   int in_what_stride = xd->plane[0].pre[0].stride;
   int mv_stride = xd->plane[0].pre[0].stride;
   uint8_t *bestaddress;
   int_mv *best_mv = &x->e_mbd.mi_8x8[0]->bmi[n].as_mv[0];
   int_mv this_mv;
   unsigned int bestsad = INT_MAX;
   int r, c;
   uint8_t *check_here;
   unsigned int thissad;
   int ref_row = ref_mv->as_mv.row;
   int ref_col = ref_mv->as_mv.col;
   int row_min = ref_row - distance;
   int row_max = ref_row + distance;
   int col_min = ref_col - distance;
   int col_max = ref_col + distance;
   unsigned int sad_array[3];
   int_mv fcenter_mv;
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
   fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;
   // Work out the mid point for the search
   in_what = xd->plane[0].pre[0].buf;
   bestaddress = in_what + (ref_row * xd->plane[0].pre[0].stride) + ref_col;
   best_mv->as_mv.row = ref_row;
   best_mv->as_mv.col = ref_col;
   // Baseline value at the centre
   bestsad = fn_ptr->sdf(what, what_stride,
                         bestaddress, in_what_stride, 0x7fffffff)
             + mvsad_err_cost(&best_mv->as_mv, &fcenter_mv.as_mv,
                              mvjsadcost, mvsadcost, sad_per_bit);
   // Apply further limits to prevent us looking using vectors that stretch
   // beyond the UMV border
   col_min = MAX(col_min, x->mv_col_min);
   col_max = MIN(col_max, x->mv_col_max);
   row_min = MAX(row_min, x->mv_row_min);
   row_max = MIN(row_max, x->mv_row_max);
   for (r = row_min; r < row_max; r++) {
     this_mv.as_mv.row = r;
     check_here = r * mv_stride + in_what + col_min;
     c = col_min;
     while ((c + 2) < col_max) {
       int i;
       fn_ptr->sdx3f(what, what_stride, check_here, in_what_stride, sad_array);
       for (i = 0; i < 3; i++) {
         thissad = sad_array[i];
         if (thissad < bestsad) {
           this_mv.as_mv.col = c;
           thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                     mvjsadcost, mvsadcost, sad_per_bit);
           if (thissad < bestsad) {
             bestsad = thissad;
             best_mv->as_mv.row = r;
             best_mv->as_mv.col = c;
             bestaddress = check_here;
           }
         }
         check_here++;
         c++;
       }
     }
     while (c < col_max) {
       thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                             bestsad);
       if (thissad < bestsad) {
         this_mv.as_mv.col = c;
         thissad  += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                    mvjsadcost, mvsadcost, sad_per_bit);
         if (thissad < bestsad) {
           bestsad = thissad;
           best_mv->as_mv.row = r;
           best_mv->as_mv.col = c;
           bestaddress = check_here;
         }
       }
       check_here++;
       c++;
     }
   }
   this_mv.as_mv.row = best_mv->as_mv.row * 8;
   this_mv.as_mv.col = best_mv->as_mv.col * 8;
   if (bestsad < INT_MAX)
     return fn_ptr->vf(what, what_stride, bestaddress, in_what_stride,
                       (unsigned int *)(&thissad)) +
                       mv_err_cost(&this_mv.as_mv, &center_mv->as_mv,
                                   mvjcost, mvcost, x->errorperbit);
   else
     return INT_MAX;
 }
 int vp9_full_search_sadx8(MACROBLOCK *x, int_mv *ref_mv,
                           int sad_per_bit, int distance,
                           vp9_variance_fn_ptr_t *fn_ptr,
                           int *mvjcost, int *mvcost[2],
                           int_mv *center_mv, int n) {
   const MACROBLOCKD* const xd = &x->e_mbd;
   uint8_t *what = x->plane[0].src.buf;
   int what_stride = x->plane[0].src.stride;
   uint8_t *in_what;
   int in_what_stride = xd->plane[0].pre[0].stride;
   int mv_stride = xd->plane[0].pre[0].stride;
   uint8_t *bestaddress;
   int_mv *best_mv = &x->e_mbd.mi_8x8[0]->bmi[n].as_mv[0];
   int_mv this_mv;
   unsigned int bestsad = INT_MAX;
   int r, c;
   uint8_t *check_here;
   unsigned int thissad;
   int ref_row = ref_mv->as_mv.row;
   int ref_col = ref_mv->as_mv.col;
   int row_min = ref_row - distance;
   int row_max = ref_row + distance;
   int col_min = ref_col - distance;
   int col_max = ref_col + distance;
   DECLARE_ALIGNED_ARRAY(16, uint32_t, sad_array8, 8);
   unsigned int sad_array[3];
   int_mv fcenter_mv;
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
   fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;
   // Work out the mid point for the search
   in_what = xd->plane[0].pre[0].buf;
   bestaddress = in_what + (ref_row * xd->plane[0].pre[0].stride) + ref_col;
   best_mv->as_mv.row = ref_row;
   best_mv->as_mv.col = ref_col;
   // Baseline value at the centre
   bestsad = fn_ptr->sdf(what, what_stride,
                         bestaddress, in_what_stride, 0x7fffffff)
             + mvsad_err_cost(&best_mv->as_mv, &fcenter_mv.as_mv,
                              mvjsadcost, mvsadcost, sad_per_bit);
   // Apply further limits to prevent us looking using vectors that stretch
   // beyond the UMV border
   col_min = MAX(col_min, x->mv_col_min);
   col_max = MIN(col_max, x->mv_col_max);
   row_min = MAX(row_min, x->mv_row_min);
   row_max = MIN(row_max, x->mv_row_max);
   for (r = row_min; r < row_max; r++) {
     this_mv.as_mv.row = r;
     check_here = r * mv_stride + in_what + col_min;
     c = col_min;
     while ((c + 7) < col_max) {
       int i;
       fn_ptr->sdx8f(what, what_stride, check_here, in_what_stride, sad_array8);
       for (i = 0; i < 8; i++) {
         thissad = (unsigned int)sad_array8[i];
         if (thissad < bestsad) {
           this_mv.as_mv.col = c;
           thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                     mvjsadcost, mvsadcost, sad_per_bit);
           if (thissad < bestsad) {
             bestsad = thissad;
             best_mv->as_mv.row = r;
             best_mv->as_mv.col = c;
             bestaddress = check_here;
           }
         }
         check_here++;
         c++;
       }
     }
     while ((c + 2) < col_max && fn_ptr->sdx3f != NULL) {
       int i;
       fn_ptr->sdx3f(what, what_stride, check_here, in_what_stride, sad_array);
       for (i = 0; i < 3; i++) {
         thissad = sad_array[i];
         if (thissad < bestsad) {
           this_mv.as_mv.col = c;
           thissad  += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                      mvjsadcost, mvsadcost, sad_per_bit);
           if (thissad < bestsad) {
             bestsad = thissad;
             best_mv->as_mv.row = r;
             best_mv->as_mv.col = c;
             bestaddress = check_here;
           }
         }
         check_here++;
         c++;
       }
     }
     while (c < col_max) {
       thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                             bestsad);
       if (thissad < bestsad) {
         this_mv.as_mv.col = c;
         thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                   mvjsadcost, mvsadcost, sad_per_bit);
         if (thissad < bestsad) {
           bestsad = thissad;
           best_mv->as_mv.row = r;
           best_mv->as_mv.col = c;
           bestaddress = check_here;
         }
       }
       check_here++;
       c++;
     }
   }
   this_mv.as_mv.row = best_mv->as_mv.row * 8;
   this_mv.as_mv.col = best_mv->as_mv.col * 8;
   if (bestsad < INT_MAX)
     return fn_ptr->vf(what, what_stride, bestaddress, in_what_stride,
                       (unsigned int *)(&thissad)) +
                       mv_err_cost(&this_mv.as_mv, &center_mv->as_mv,
                                   mvjcost, mvcost, x->errorperbit);
   else
     return INT_MAX;
 }
 int vp9_refining_search_sad_c(MACROBLOCK *x,
                               int_mv *ref_mv, int error_per_bit,
                               int search_range, vp9_variance_fn_ptr_t *fn_ptr,
                               int *mvjcost, int *mvcost[2], int_mv *center_mv) {
   const MACROBLOCKD* const xd = &x->e_mbd;
   MV neighbors[4] = {{ -1, 0}, {0, -1}, {0, 1}, {1, 0}};
   int i, j;
   int this_row_offset, this_col_offset;
   int what_stride = x->plane[0].src.stride;
   int in_what_stride = xd->plane[0].pre[0].stride;
   uint8_t *what = x->plane[0].src.buf;
   uint8_t *best_address = xd->plane[0].pre[0].buf +
                           (ref_mv->as_mv.row * xd->plane[0].pre[0].stride) +
                           ref_mv->as_mv.col;
   uint8_t *check_here;
   unsigned int thissad;
   int_mv this_mv;
   unsigned int bestsad = INT_MAX;
   int_mv fcenter_mv;
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
   fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;
   bestsad = fn_ptr->sdf(what, what_stride, best_address,
                         in_what_stride, 0x7fffffff) +
                         mvsad_err_cost(&ref_mv->as_mv, &fcenter_mv.as_mv,
                                        mvjsadcost, mvsadcost, error_per_bit);
   for (i = 0; i < search_range; i++) {
     int best_site = -1;
     for (j = 0; j < 4; j++) {
       this_row_offset = ref_mv->as_mv.row + neighbors[j].row;
       this_col_offset = ref_mv->as_mv.col + neighbors[j].col;
       if ((this_col_offset > x->mv_col_min) &&
           (this_col_offset < x->mv_col_max) &&
           (this_row_offset > x->mv_row_min) &&
           (this_row_offset < x->mv_row_max)) {
         check_here = (neighbors[j].row) * in_what_stride + neighbors[j].col +
                      best_address;
         thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                               bestsad);
         if (thissad < bestsad) {
           this_mv.as_mv.row = this_row_offset;
           this_mv.as_mv.col = this_col_offset;
           thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                     mvjsadcost, mvsadcost, error_per_bit);
           if (thissad < bestsad) {
             bestsad = thissad;
             best_site = j;
           }
         }
       }
     }
     if (best_site == -1) {
       break;
     } else {
       ref_mv->as_mv.row += neighbors[best_site].row;
       ref_mv->as_mv.col += neighbors[best_site].col;
       best_address += (neighbors[best_site].row) * in_what_stride +
                       neighbors[best_site].col;
     }
   }
   this_mv.as_mv.row = ref_mv->as_mv.row * 8;
   this_mv.as_mv.col = ref_mv->as_mv.col * 8;
   if (bestsad < INT_MAX)
     return fn_ptr->vf(what, what_stride, best_address, in_what_stride,
                       (unsigned int *)(&thissad)) +
                       mv_err_cost(&this_mv.as_mv, &center_mv->as_mv,
                                   mvjcost, mvcost, x->errorperbit);
   else
     return INT_MAX;
 }
 int vp9_refining_search_sadx4(MACROBLOCK *x,
                               int_mv *ref_mv, int error_per_bit,
                               int search_range, vp9_variance_fn_ptr_t *fn_ptr,
                               int *mvjcost, int *mvcost[2], int_mv *center_mv) {
   const MACROBLOCKD* const xd = &x->e_mbd;
   MV neighbors[4] = {{ -1, 0}, {0, -1}, {0, 1}, {1, 0}};
   int i, j;
   int this_row_offset, this_col_offset;
   int what_stride = x->plane[0].src.stride;
   int in_what_stride = xd->plane[0].pre[0].stride;
   uint8_t *what = x->plane[0].src.buf;
   uint8_t *best_address = xd->plane[0].pre[0].buf +
                           (ref_mv->as_mv.row * xd->plane[0].pre[0].stride) +
                           ref_mv->as_mv.col;
   uint8_t *check_here;
   unsigned int thissad;
   int_mv this_mv;
   unsigned int bestsad = INT_MAX;
   int_mv fcenter_mv;
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
   fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;
   bestsad = fn_ptr->sdf(what, what_stride, best_address,
                         in_what_stride, 0x7fffffff) +
       mvsad_err_cost(&ref_mv->as_mv, &fcenter_mv.as_mv,
                      mvjsadcost, mvsadcost, error_per_bit);
   for (i = 0; i < search_range; i++) {
     int best_site = -1;
     int all_in = ((ref_mv->as_mv.row - 1) > x->mv_row_min) &
                  ((ref_mv->as_mv.row + 1) < x->mv_row_max) &
                  ((ref_mv->as_mv.col - 1) > x->mv_col_min) &
                  ((ref_mv->as_mv.col + 1) < x->mv_col_max);
     if (all_in) {
       unsigned int sad_array[4];
       unsigned char const *block_offset[4];
       block_offset[0] = best_address - in_what_stride;
       block_offset[1] = best_address - 1;
       block_offset[2] = best_address + 1;
       block_offset[3] = best_address + in_what_stride;
       fn_ptr->sdx4df(what, what_stride, block_offset, in_what_stride,
                      sad_array);
       for (j = 0; j < 4; j++) {
         if (sad_array[j] < bestsad) {
           this_mv.as_mv.row = ref_mv->as_mv.row + neighbors[j].row;
           this_mv.as_mv.col = ref_mv->as_mv.col + neighbors[j].col;
           sad_array[j] += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                          mvjsadcost, mvsadcost, error_per_bit);
           if (sad_array[j] < bestsad) {
             bestsad = sad_array[j];
             best_site = j;
           }
         }
       }
     } else {
       for (j = 0; j < 4; j++) {
         this_row_offset = ref_mv->as_mv.row + neighbors[j].row;
         this_col_offset = ref_mv->as_mv.col + neighbors[j].col;
         if ((this_col_offset > x->mv_col_min) &&
             (this_col_offset < x->mv_col_max) &&
             (this_row_offset > x->mv_row_min) &&
             (this_row_offset < x->mv_row_max)) {
           check_here = (neighbors[j].row) * in_what_stride + neighbors[j].col +
                        best_address;
           thissad = fn_ptr->sdf(what, what_stride, check_here, in_what_stride,
                                 bestsad);
           if (thissad < bestsad) {
             this_mv.as_mv.row = this_row_offset;
             this_mv.as_mv.col = this_col_offset;
             thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                       mvjsadcost, mvsadcost, error_per_bit);
             if (thissad < bestsad) {
               bestsad = thissad;
               best_site = j;
             }
           }
         }
       }
     }
     if (best_site == -1) {
       break;
     } else {
       ref_mv->as_mv.row += neighbors[best_site].row;
       ref_mv->as_mv.col += neighbors[best_site].col;
       best_address += (neighbors[best_site].row) * in_what_stride +
                       neighbors[best_site].col;
     }
   }
   this_mv.as_mv.row = ref_mv->as_mv.row * 8;
   this_mv.as_mv.col = ref_mv->as_mv.col * 8;
   if (bestsad < INT_MAX)
     return fn_ptr->vf(what, what_stride, best_address, in_what_stride,
                       (unsigned int *)(&thissad)) +
                       mv_err_cost(&this_mv.as_mv, &center_mv->as_mv,
                                   mvjcost, mvcost, x->errorperbit);
   else
     return INT_MAX;
 }
 /* This function is called when we do joint motion search in comp_inter_inter
  * mode.
  */
 int vp9_refining_search_8p_c(MACROBLOCK *x,
                              int_mv *ref_mv, int error_per_bit,
                              int search_range, vp9_variance_fn_ptr_t *fn_ptr,
                              int *mvjcost, int *mvcost[2], int_mv *center_mv,
                              const uint8_t *second_pred, int w, int h) {
   const MACROBLOCKD* const xd = &x->e_mbd;
   MV neighbors[8] = {{-1, 0}, {0, -1}, {0, 1}, {1, 0},
       {-1, -1}, {1, -1}, {-1, 1}, {1, 1}};
   int i, j;
   int this_row_offset, this_col_offset;
   int what_stride = x->plane[0].src.stride;
   int in_what_stride = xd->plane[0].pre[0].stride;
   uint8_t *what = x->plane[0].src.buf;
   uint8_t *best_address = xd->plane[0].pre[0].buf +
                           (ref_mv->as_mv.row * xd->plane[0].pre[0].stride) +
                           ref_mv->as_mv.col;
   uint8_t *check_here;
   unsigned int thissad;
   int_mv this_mv;
   unsigned int bestsad = INT_MAX;
   int_mv fcenter_mv;
   int *mvjsadcost = x->nmvjointsadcost;
   int *mvsadcost[2] = {x->nmvsadcost[0], x->nmvsadcost[1]};
   fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
   fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;
   /* Get compound pred by averaging two pred blocks. */
   bestsad = fn_ptr->sdaf(what, what_stride, best_address, in_what_stride,
                          second_pred, 0x7fffffff) +
       mvsad_err_cost(&ref_mv->as_mv, &fcenter_mv.as_mv,
                      mvjsadcost, mvsadcost, error_per_bit);
   for (i = 0; i < search_range; i++) {
     int best_site = -1;
     for (j = 0; j < 8; j++) {
       this_row_offset = ref_mv->as_mv.row + neighbors[j].row;
       this_col_offset = ref_mv->as_mv.col + neighbors[j].col;
       if ((this_col_offset > x->mv_col_min) &&
           (this_col_offset < x->mv_col_max) &&
           (this_row_offset > x->mv_row_min) &&
           (this_row_offset < x->mv_row_max)) {
         check_here = (neighbors[j].row) * in_what_stride + neighbors[j].col +
             best_address;
         /* Get compound block and use it to calculate SAD. */
         thissad = fn_ptr->sdaf(what, what_stride, check_here, in_what_stride,
                                second_pred, bestsad);
         if (thissad < bestsad) {
           this_mv.as_mv.row = this_row_offset;
           this_mv.as_mv.col = this_col_offset;
           thissad += mvsad_err_cost(&this_mv.as_mv, &fcenter_mv.as_mv,
                                     mvjsadcost, mvsadcost, error_per_bit);
           if (thissad < bestsad) {
             bestsad = thissad;
             best_site = j;
           }
         }
       }
     }
     if (best_site == -1) {
       break;
     } else {
       ref_mv->as_mv.row += neighbors[best_site].row;
       ref_mv->as_mv.col += neighbors[best_site].col;
       best_address += (neighbors[best_site].row) * in_what_stride +
           neighbors[best_site].col;
     }
   }
   this_mv.as_mv.row = ref_mv->as_mv.row * 8;
   this_mv.as_mv.col = ref_mv->as_mv.col * 8;
   if (bestsad < INT_MAX) {
     // FIXME(rbultje, yunqing): add full-pixel averaging variance functions
     // so we don't have to use the subpixel with xoff=0,yoff=0 here.
     return fn_ptr->svaf(best_address, in_what_stride, 0, 0, what, what_stride,
                         (unsigned int *)(&thissad), second_pred) +
                         mv_err_cost(&this_mv.as_mv, &center_mv->as_mv,
                                     mvjcost, mvcost, x->errorperbit);
   } else {
     return INT_MAX;
   }
 }

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media/libvpx/vp9/encoder/vp9_mcomp.c