vpx/vp8/encoder/mcomp.c

/*
 *  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 "vp8/encoder/onyx_int.h"
#include "mcomp.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/config.h"
#include <stdio.h>
#include <limits.h>
#include <math.h>
#include "vp8/common/findnearmv.h"

#ifdef ENTROPY_STATS
static int mv_ref_ct [31] [4] [2];
static int mv_mode_cts [4] [2];
#endif

void vp8_clamp_mv_min_max(MACROBLOCK *x, int_mv *ref_mv) {
  int col_min = (ref_mv->as_mv.col >> 3) - MAX_FULL_PEL_VAL +
      ((ref_mv->as_mv.col & 7) ? 1 : 0);
  int row_min = (ref_mv->as_mv.row >> 3) - MAX_FULL_PEL_VAL +
      ((ref_mv->as_mv.row & 7) ? 1 : 0);
  int col_max = (ref_mv->as_mv.col >> 3) + MAX_FULL_PEL_VAL;
  int row_max = (ref_mv->as_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 vp8_mv_bit_cost(int_mv *mv, int_mv *ref, int *mvcost[2],
                    int Weight, int ishp) {
  // MV costing is based on the distribution of vectors in the previous frame
  // and as such will tend to over state the cost of vectors. In addition
  // coding a new vector can have a knock on effect on the cost of subsequent
  // vectors and the quality of prediction from NEAR and NEAREST for subsequent
  // blocks. The "Weight" parameter allows, to a limited extent, for some
  // account to be taken of these factors.
  return ((mvcost[0][(mv->as_mv.row - ref->as_mv.row) >> (ishp == 0)] +
           mvcost[1][(mv->as_mv.col - ref->as_mv.col) >> (ishp == 0)])
          * Weight) >> 7;
}

static int mv_err_cost(int_mv *mv, int_mv *ref, int *mvcost[2],
                       int error_per_bit, int ishp) {
  // Ignore costing if mvcost is NULL
  if (mvcost)
    return ((mvcost[0][(mv->as_mv.row - ref->as_mv.row) >> (ishp == 0)] +
             mvcost[1][(mv->as_mv.col - ref->as_mv.col) >> (ishp == 0)])
            * error_per_bit + 128) >> 8;
  return 0;
}


static int mvsad_err_cost(int_mv *mv, int_mv *ref, int *mvsadcost[2],
                          int error_per_bit) {
  // Calculate sad error cost on full pixel basis.
  // Ignore costing if mvcost is NULL
  if (mvsadcost)
    return ((mvsadcost[0][(mv->as_mv.row - ref->as_mv.row)] +
             mvsadcost[1][(mv->as_mv.col - ref->as_mv.col)])
            * error_per_bit + 128) >> 8;
  return 0;
}


void vp8_init_dsmotion_compensation(MACROBLOCK *x, int stride) {
  int Len;
  int search_site_count = 0;


  // Generate offsets for 4 search sites per step.
  Len = MAX_FIRST_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++;

  while (Len > 0) {

    // 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++;

    // Contract.
    Len /= 2;
  }

  x->ss_count = search_site_count;
  x->searches_per_step = 4;
}

void vp8_init3smotion_compensation(MACROBLOCK *x, int stride) {
  int Len;
  int search_site_count = 0;

  // Generate offsets for 8 search sites per step.
  Len = MAX_FIRST_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++;

  while (Len > 0) {

    // 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++;

    // Compute offsets for search sites.
    x->ss[search_site_count].mv.col = -Len;
    x->ss[search_site_count].mv.row = -Len;
    x->ss[search_site_count].offset = -Len * stride - Len;
    search_site_count++;

    // Compute offsets for search sites.
    x->ss[search_site_count].mv.col = Len;
    x->ss[search_site_count].mv.row = -Len;
    x->ss[search_site_count].offset = -Len * stride + Len;
    search_site_count++;

    // Compute offsets for search sites.
    x->ss[search_site_count].mv.col = -Len;
    x->ss[search_site_count].mv.row = Len;
    x->ss[search_site_count].offset = Len * stride - Len;
    search_site_count++;

    // Compute offsets for search sites.
    x->ss[search_site_count].mv.col = Len;
    x->ss[search_site_count].mv.row = Len;
    x->ss[search_site_count].offset = Len * stride + Len;
    search_site_count++;


    // Contract.
    Len /= 2;
  }

  x->ss_count = search_site_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.
 */

#define PRE(r,c) (y + (((r)>>2) * y_stride + ((c)>>2) -(offset))) // pointer to predictor base of a motionvector
#define SP(x) (((x)&3)<<2) // convert motion vector component to offset for svf calc
#define MVC(r,c) (mvcost ? ((mvcost[0][(r)-rr] + mvcost[1][(c)-rc]) * error_per_bit + 128 )>>8 : 0) // estimated cost of a motion vector (r,c)
#define DIST(r,c) vfp->svf( PRE(r,c), y_stride, SP(c),SP(r), z,b->src_stride,&sse) // returns subpixel variance error function.
#define ERR(r,c) (MVC(r,c)+DIST(r,c)) // returns distortion + motion vector cost
#define IFMVCV(r,c,s,e) if ( c >= minc && c <= maxc && r >= minr && r <= maxr) s else e;

#define PREHP(r,c) (y + (((r)>>3) * y_stride + ((c)>>3) -(offset))) // pointer to predictor base of a motionvector
#define SPHP(x) (((x)&7)<<1) // convert motion vector component to offset for svf calc
#define DISTHP(r,c) vfp->svf( PREHP(r,c), y_stride, SPHP(c),SPHP(r), z,b->src_stride,&sse) // returns subpixel variance error function.
#define ERRHP(r,c) (MVC(r,c)+DISTHP(r,c)) // returns distortion + motion vector cost
#define CHECK_BETTER(v,r,c) IFMVCV(r,c,{thismse = ((xd->allow_high_precision_mv)?DISTHP(r,c):DIST(r,c)); if((v = (MVC(r,c)+thismse)) < besterr) { besterr = v; br=r; bc=c; *distortion = thismse; *sse1 = sse; }}, v=INT_MAX;)// checks if (r,c) has better score than previous best

#define MIN(x,y) (((x)<(y))?(x):(y))
#define MAX(x,y) (((x)>(y))?(x):(y))

int vp8_find_best_sub_pixel_step_iteratively(MACROBLOCK *x, BLOCK *b, BLOCKD *d,
                                             int_mv *bestmv, int_mv *ref_mv,
                                             int error_per_bit,
                                             const vp8_variance_fn_ptr_t *vfp,
                                             int *mvcost[2], int *distortion,
                                             unsigned int *sse1) {
  unsigned char *z = (*(b->base_src) + b->src);
  MACROBLOCKD *xd = &x->e_mbd;

  int rr, rc, br, bc, hstep;
  int tr, tc;
  unsigned int besterr = INT_MAX;
  unsigned int left, right, up, down, diag;
  unsigned int sse;
  unsigned int whichdir;
  unsigned int halfiters = 4;
  unsigned int quarteriters = 4;
  unsigned int eighthiters = 4;
  int thismse;
  int maxc, minc, maxr, minr;
  int y_stride;
  int offset;

#if !CONFIG_SUPERBLOCKS && (ARCH_X86 || ARCH_X86_64)
  unsigned char *y0 = *(d->base_pre) + d->pre + (bestmv->as_mv.row) * d->pre_stride + bestmv->as_mv.col;
  unsigned char *y;
  int buf_r1, buf_r2, buf_c1, buf_c2;

  // Clamping to avoid out-of-range data access
  buf_r1 = ((bestmv->as_mv.row - INTERP_EXTEND) < x->mv_row_min) ?
      (bestmv->as_mv.row - x->mv_row_min) : INTERP_EXTEND - 1;
  buf_r2 = ((bestmv->as_mv.row + INTERP_EXTEND) > x->mv_row_max) ?
      (x->mv_row_max - bestmv->as_mv.row) : INTERP_EXTEND - 1;
  buf_c1 = ((bestmv->as_mv.col - INTERP_EXTEND) < x->mv_col_min) ?
      (bestmv->as_mv.col - x->mv_col_min) : INTERP_EXTEND - 1;
  buf_c2 = ((bestmv->as_mv.col + INTERP_EXTEND) > x->mv_col_max) ?
      (x->mv_col_max - bestmv->as_mv.col) : INTERP_EXTEND - 1;
  y_stride = 32;

  /* Copy to intermediate buffer before searching. */
  vfp->copymem(y0 - buf_c1 - d->pre_stride * buf_r1, d->pre_stride, xd->y_buf, y_stride, 16 + buf_r1 + buf_r2);
  y = xd->y_buf + y_stride * buf_r1 + buf_c1;
#else
  unsigned char *y = *(d->base_pre) + d->pre + (bestmv->as_mv.row) * d->pre_stride + bestmv->as_mv.col;
  y_stride = d->pre_stride;
#endif


  if (xd->allow_high_precision_mv) {
    rr = ref_mv->as_mv.row;
    rc = ref_mv->as_mv.col;
    br = bestmv->as_mv.row << 3;
    bc = bestmv->as_mv.col << 3;
    hstep = 4;
    minc = MAX(x->mv_col_min << 3, (ref_mv->as_mv.col) - ((1 << mvlong_width_hp) - 1));
    maxc = MIN(x->mv_col_max << 3, (ref_mv->as_mv.col) + ((1 << mvlong_width_hp) - 1));
    minr = MAX(x->mv_row_min << 3, (ref_mv->as_mv.row) - ((1 << mvlong_width_hp) - 1));
    maxr = MIN(x->mv_row_max << 3, (ref_mv->as_mv.row) + ((1 << mvlong_width_hp) - 1));
  } else {
    rr = ref_mv->as_mv.row >> 1;
    rc = ref_mv->as_mv.col >> 1;
    br = bestmv->as_mv.row << 2;
    bc = bestmv->as_mv.col << 2;
    hstep = 2;
    minc = MAX(x->mv_col_min << 2, (ref_mv->as_mv.col >> 1) - ((1 << mvlong_width) - 1));
    maxc = MIN(x->mv_col_max << 2, (ref_mv->as_mv.col >> 1) + ((1 << mvlong_width) - 1));
    minr = MAX(x->mv_row_min << 2, (ref_mv->as_mv.row >> 1) - ((1 << mvlong_width) - 1));
    maxr = MIN(x->mv_row_max << 2, (ref_mv->as_mv.row >> 1) + ((1 << mvlong_width) - 1));
  }

  tr = br;
  tc = bc;


  offset = (bestmv->as_mv.row) * y_stride + bestmv->as_mv.col;

  // central mv
  bestmv->as_mv.row <<= 3;
  bestmv->as_mv.col <<= 3;

  // calculate central point error
  besterr = vfp->vf(y, y_stride, z, b->src_stride, sse1);
  *distortion = besterr;
  besterr += mv_err_cost(bestmv, ref_mv, mvcost, error_per_bit,
                         xd->allow_high_precision_mv);

  // TODO: 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
    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;
    }

    // no reason to check the same one again.
    if (tr == br && tc == bc)
      break;

    tr = br;
    tc = bc;
  }

  // TODO: Each subsequent iteration checks at least one point in common with
  // the last iteration could be 2 ( if diag selected) 1/4 pel
  hstep >>= 1;
  while (--quarteriters) {
    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;
    }

    // no reason to check the same one again.
    if (tr == br && tc == bc)
      break;

    tr = br;
    tc = bc;
  }

  if (x->e_mbd.allow_high_precision_mv) {
    hstep >>= 1;
    while (--eighthiters) {
      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;
      }

      // no reason to check the same one again.
      if (tr == br && tc == bc)
        break;

      tr = br;
      tc = bc;
    }
  }
  if (x->e_mbd.allow_high_precision_mv) {
    bestmv->as_mv.row = br;
    bestmv->as_mv.col = bc;
  } else {
    bestmv->as_mv.row = br << 1;
    bestmv->as_mv.col = bc << 1;
  }

  if ((abs(bestmv->as_mv.col - ref_mv->as_mv.col) > (MAX_FULL_PEL_VAL << 3)) ||
      (abs(bestmv->as_mv.row - ref_mv->as_mv.row) > (MAX_FULL_PEL_VAL << 3)))
    return INT_MAX;

  return besterr;
}
#undef MVC
#undef PRE
#undef SP
#undef DIST
#undef IFMVCV
#undef ERR
#undef CHECK_BETTER
#undef MIN
#undef MAX

#undef PREHP
#undef DPHP
#undef DISTHP
#undef ERRHP

#define SP(x) (((x)&7)<<1) // convert motion vector component to offset for svf calc
int vp8_find_best_sub_pixel_step(MACROBLOCK *x, BLOCK *b, BLOCKD *d,
                                 int_mv *bestmv, int_mv *ref_mv,
                                 int error_per_bit,
                                 const vp8_variance_fn_ptr_t *vfp,
                                 int *mvcost[2], int *distortion,
                                 unsigned int *sse1) {
  int bestmse = INT_MAX;
  int_mv startmv;
  int_mv this_mv;
  int_mv orig_mv;
  int yrow_movedback = 0, ycol_movedback = 0;
  unsigned char *z = (*(b->base_src) + b->src);
  int left, right, up, down, diag;
  unsigned int sse;
  int whichdir;
  int thismse;
  int y_stride;
  MACROBLOCKD *xd = &x->e_mbd;

#if !CONFIG_SUPERBLOCKS && (ARCH_X86 || ARCH_X86_64)
  unsigned char *y0 = *(d->base_pre) + d->pre + (bestmv->as_mv.row) * d->pre_stride + bestmv->as_mv.col;
  unsigned char *y;

  y_stride = 32;
  /* Copy 18 rows x 32 cols area to intermediate buffer before searching. */
  vfp->copymem(y0 - 1 - d->pre_stride, d->pre_stride, xd->y_buf, y_stride, 18);
  y = xd->y_buf + y_stride + 1;
#else
  unsigned char *y = *(d->base_pre) + d->pre + (bestmv->as_mv.row) * d->pre_stride + bestmv->as_mv.col;
  y_stride = d->pre_stride;
#endif

  // central mv
  bestmv->as_mv.row <<= 3;
  bestmv->as_mv.col <<= 3;
  startmv = *bestmv;
  orig_mv = *bestmv;

  // calculate central point error
  bestmse = vfp->vf(y, y_stride, z, b->src_stride, sse1);
  *distortion = bestmse;
  bestmse += mv_err_cost(bestmv, ref_mv, mvcost, error_per_bit,
                         xd->allow_high_precision_mv);

  // go left then right and check error
  this_mv.as_mv.row = startmv.as_mv.row;
  this_mv.as_mv.col = ((startmv.as_mv.col - 8) | 4);
  thismse = vfp->svf_halfpix_h(y - 1, y_stride, z, b->src_stride, &sse);
  left = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (left < bestmse) {
    *bestmv = this_mv;
    bestmse = left;
    *distortion = thismse;
    *sse1 = sse;
  }

  this_mv.as_mv.col += 8;
  thismse = vfp->svf_halfpix_h(y, y_stride, z, b->src_stride, &sse);
  right = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                                xd->allow_high_precision_mv);

  if (right < bestmse) {
    *bestmv = this_mv;
    bestmse = right;
    *distortion = thismse;
    *sse1 = sse;
  }

  // go up then down and check error
  this_mv.as_mv.col = startmv.as_mv.col;
  this_mv.as_mv.row = ((startmv.as_mv.row - 8) | 4);
  thismse =  vfp->svf_halfpix_v(y - y_stride, y_stride, z, b->src_stride, &sse);
  up = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                             xd->allow_high_precision_mv);

  if (up < bestmse) {
    *bestmv = this_mv;
    bestmse = up;
    *distortion = thismse;
    *sse1 = sse;
  }

  this_mv.as_mv.row += 8;
  thismse = vfp->svf_halfpix_v(y, y_stride, z, b->src_stride, &sse);
  down = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (down < bestmse) {
    *bestmv = this_mv;
    bestmse = down;
    *distortion = thismse;
    *sse1 = sse;
  }


  // now check 1 more diagonal
  whichdir = (left < right ? 0 : 1) + (up < down ? 0 : 2);
  // for(whichdir =0;whichdir<4;whichdir++)
  // {
  this_mv = startmv;

  switch (whichdir) {
    case 0:
      this_mv.as_mv.col = (this_mv.as_mv.col - 8) | 4;
      this_mv.as_mv.row = (this_mv.as_mv.row - 8) | 4;
      thismse = vfp->svf_halfpix_hv(y - 1 - y_stride, y_stride, z, b->src_stride, &sse);
      break;
    case 1:
      this_mv.as_mv.col += 4;
      this_mv.as_mv.row = (this_mv.as_mv.row - 8) | 4;
      thismse = vfp->svf_halfpix_hv(y - y_stride, y_stride, z, b->src_stride, &sse);
      break;
    case 2:
      this_mv.as_mv.col = (this_mv.as_mv.col - 8) | 4;
      this_mv.as_mv.row += 4;
      thismse = vfp->svf_halfpix_hv(y - 1, y_stride, z, b->src_stride, &sse);
      break;
    case 3:
    default:
      this_mv.as_mv.col += 4;
      this_mv.as_mv.row += 4;
      thismse = vfp->svf_halfpix_hv(y, y_stride, z, b->src_stride, &sse);
      break;
  }

  diag = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (diag < bestmse) {
    *bestmv = this_mv;
    bestmse = diag;
    *distortion = thismse;
    *sse1 = sse;
  }

//  }


  // time to check quarter pels.
  if (bestmv->as_mv.row < startmv.as_mv.row) {
    y -= y_stride;
    yrow_movedback = 1;
  }

  if (bestmv->as_mv.col < startmv.as_mv.col) {
    y--;
    ycol_movedback = 1;
  }

  startmv = *bestmv;



  // go left then right and check error
  this_mv.as_mv.row = startmv.as_mv.row;

  if (startmv.as_mv.col & 7) {
    this_mv.as_mv.col = startmv.as_mv.col - 2;
    thismse = vfp->svf(y, y_stride,
                       SP(this_mv.as_mv.col), SP(this_mv.as_mv.row),
                       z, b->src_stride, &sse);
  } else {
    this_mv.as_mv.col = (startmv.as_mv.col - 8) | 6;
    thismse = vfp->svf(y - 1, y_stride, SP(6), SP(this_mv.as_mv.row), z,
                       b->src_stride, &sse);
  }

  left = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (left < bestmse) {
    *bestmv = this_mv;
    bestmse = left;
    *distortion = thismse;
    *sse1 = sse;
  }

  this_mv.as_mv.col += 4;
  thismse = vfp->svf(y, y_stride,
                     SP(this_mv.as_mv.col), SP(this_mv.as_mv.row),
                     z, b->src_stride, &sse);
  right = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                                xd->allow_high_precision_mv);

  if (right < bestmse) {
    *bestmv = this_mv;
    bestmse = right;
    *distortion = thismse;
    *sse1 = sse;
  }

  // go up then down and check error
  this_mv.as_mv.col = startmv.as_mv.col;

  if (startmv.as_mv.row & 7) {
    this_mv.as_mv.row = startmv.as_mv.row - 2;
    thismse = vfp->svf(y, y_stride,
                       SP(this_mv.as_mv.col), SP(this_mv.as_mv.row),
                       z, b->src_stride, &sse);
  } else {
    this_mv.as_mv.row = (startmv.as_mv.row - 8) | 6;
    thismse = vfp->svf(y - y_stride, y_stride, SP(this_mv.as_mv.col), SP(6),
                       z, b->src_stride, &sse);
  }

  up = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                             xd->allow_high_precision_mv);

  if (up < bestmse) {
    *bestmv = this_mv;
    bestmse = up;
    *distortion = thismse;
    *sse1 = sse;
  }

  this_mv.as_mv.row += 4;
  thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row),
                     z, b->src_stride, &sse);
  down = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (down < bestmse) {
    *bestmv = this_mv;
    bestmse = down;
    *distortion = thismse;
    *sse1 = sse;
  }


  // now check 1 more diagonal
  whichdir = (left < right ? 0 : 1) + (up < down ? 0 : 2);

//  for(whichdir=0;whichdir<4;whichdir++)
//  {
  this_mv = startmv;

  switch (whichdir) {
    case 0:

      if (startmv.as_mv.row & 7) {
        this_mv.as_mv.row -= 2;

        if (startmv.as_mv.col & 7) {
          this_mv.as_mv.col -= 2;
          thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
        } else {
          this_mv.as_mv.col = (startmv.as_mv.col - 8) | 6;
          thismse = vfp->svf(y - 1, y_stride, SP(6), SP(this_mv.as_mv.row), z, b->src_stride, &sse);;
        }
      } else {
        this_mv.as_mv.row = (startmv.as_mv.row - 8) | 6;

        if (startmv.as_mv.col & 7) {
          this_mv.as_mv.col -= 2;
          thismse = vfp->svf(y - y_stride, y_stride, SP(this_mv.as_mv.col), SP(6), z, b->src_stride, &sse);
        } else {
          this_mv.as_mv.col = (startmv.as_mv.col - 8) | 6;
          thismse = vfp->svf(y - y_stride - 1, y_stride, SP(6), SP(6), z, b->src_stride, &sse);
        }
      }

      break;
    case 1:
      this_mv.as_mv.col += 2;

      if (startmv.as_mv.row & 7) {
        this_mv.as_mv.row -= 2;
        thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
      } else {
        this_mv.as_mv.row = (startmv.as_mv.row - 8) | 6;
        thismse = vfp->svf(y - y_stride, y_stride, SP(this_mv.as_mv.col), SP(6), z, b->src_stride, &sse);
      }

      break;
    case 2:
      this_mv.as_mv.row += 2;

      if (startmv.as_mv.col & 7) {
        this_mv.as_mv.col -= 2;
        thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row),
                           z, b->src_stride, &sse);
      } else {
        this_mv.as_mv.col = (startmv.as_mv.col - 8) | 6;
        thismse = vfp->svf(y - 1, y_stride, SP(6), SP(this_mv.as_mv.row), z,
                           b->src_stride, &sse);
      }

      break;
    case 3:
      this_mv.as_mv.col += 2;
      this_mv.as_mv.row += 2;
      thismse = vfp->svf(y, y_stride,
                         SP(this_mv.as_mv.col), SP(this_mv.as_mv.row),
                         z, b->src_stride, &sse);
      break;
  }

  diag = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (diag < bestmse) {
    *bestmv = this_mv;
    bestmse = diag;
    *distortion = thismse;
    *sse1 = sse;
  }

  if (!x->e_mbd.allow_high_precision_mv)
    return bestmse;

  /* Now do 1/8th pixel */
  if (bestmv->as_mv.row < orig_mv.as_mv.row && !yrow_movedback) {
    y -= y_stride;
    yrow_movedback = 1;
  }

  if (bestmv->as_mv.col < orig_mv.as_mv.col && !ycol_movedback) {
    y--;
    ycol_movedback = 1;
  }

  startmv = *bestmv;

  // go left then right and check error
  this_mv.as_mv.row = startmv.as_mv.row;

  if (startmv.as_mv.col & 7) {
    this_mv.as_mv.col = startmv.as_mv.col - 1;
    thismse = vfp->svf(y, y_stride,
                       SP(this_mv.as_mv.col), SP(this_mv.as_mv.row),
                       z, b->src_stride, &sse);
  } else {
    this_mv.as_mv.col = (startmv.as_mv.col - 8) | 7;
    thismse = vfp->svf(y - 1, y_stride, SP(7), SP(this_mv.as_mv.row),
                       z, b->src_stride, &sse);
  }

  left = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (left < bestmse) {
    *bestmv = this_mv;
    bestmse = left;
    *distortion = thismse;
    *sse1 = sse;
  }

  this_mv.as_mv.col += 2;
  thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
  right = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit, xd->allow_high_precision_mv);

  if (right < bestmse) {
    *bestmv = this_mv;
    bestmse = right;
    *distortion = thismse;
    *sse1 = sse;
  }

  // go up then down and check error
  this_mv.as_mv.col = startmv.as_mv.col;

  if (startmv.as_mv.row & 7) {
    this_mv.as_mv.row = startmv.as_mv.row - 1;
    thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
  } else {
    this_mv.as_mv.row = (startmv.as_mv.row - 8) | 7;
    thismse = vfp->svf(y - y_stride, y_stride, SP(this_mv.as_mv.col), SP(7), z, b->src_stride, &sse);
  }

  up = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit, xd->allow_high_precision_mv);

  if (up < bestmse) {
    *bestmv = this_mv;
    bestmse = up;
    *distortion = thismse;
    *sse1 = sse;
  }

  this_mv.as_mv.row += 2;
  thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
  down = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit, xd->allow_high_precision_mv);

  if (down < bestmse) {
    *bestmv = this_mv;
    bestmse = down;
    *distortion = thismse;
    *sse1 = sse;
  }

  // now check 1 more diagonal
  whichdir = (left < right ? 0 : 1) + (up < down ? 0 : 2);

//  for(whichdir=0;whichdir<4;whichdir++)
//  {
  this_mv = startmv;

  switch (whichdir) {
    case 0:

      if (startmv.as_mv.row & 7) {
        this_mv.as_mv.row -= 1;

        if (startmv.as_mv.col & 7) {
          this_mv.as_mv.col -= 1;
          thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
        } else {
          this_mv.as_mv.col = (startmv.as_mv.col - 8) | 7;
          thismse = vfp->svf(y - 1, y_stride, SP(7), SP(this_mv.as_mv.row), z, b->src_stride, &sse);;
        }
      } else {
        this_mv.as_mv.row = (startmv.as_mv.row - 8) | 7;

        if (startmv.as_mv.col & 7) {
          this_mv.as_mv.col -= 1;
          thismse = vfp->svf(y - y_stride, y_stride, SP(this_mv.as_mv.col), SP(7), z, b->src_stride, &sse);
        } else {
          this_mv.as_mv.col = (startmv.as_mv.col - 8) | 7;
          thismse = vfp->svf(y - y_stride - 1, y_stride, SP(7), SP(7), z, b->src_stride, &sse);
        }
      }

      break;
    case 1:
      this_mv.as_mv.col += 1;

      if (startmv.as_mv.row & 7) {
        this_mv.as_mv.row -= 1;
        thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
      } else {
        this_mv.as_mv.row = (startmv.as_mv.row - 8) | 7;
        thismse = vfp->svf(y - y_stride, y_stride, SP(this_mv.as_mv.col), SP(7), z, b->src_stride, &sse);
      }

      break;
    case 2:
      this_mv.as_mv.row += 1;

      if (startmv.as_mv.col & 7) {
        this_mv.as_mv.col -= 1;
        thismse = vfp->svf(y, y_stride, SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
      } else {
        this_mv.as_mv.col = (startmv.as_mv.col - 8) | 7;
        thismse = vfp->svf(y - 1, y_stride, SP(7), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
      }

      break;
    case 3:
      this_mv.as_mv.col += 1;
      this_mv.as_mv.row += 1;
      thismse = vfp->svf(y, y_stride,  SP(this_mv.as_mv.col), SP(this_mv.as_mv.row), z, b->src_stride, &sse);
      break;
  }

  diag = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit, xd->allow_high_precision_mv);

  if (diag < bestmse) {
    *bestmv = this_mv;
    bestmse = diag;
    *distortion = thismse;
    *sse1 = sse;
  }

  return bestmse;
}

#undef SP

int vp8_find_best_half_pixel_step(MACROBLOCK *x, BLOCK *b, BLOCKD *d,
                                  int_mv *bestmv, int_mv *ref_mv,
                                  int error_per_bit,
                                  const vp8_variance_fn_ptr_t *vfp,
                                  int *mvcost[2], int *distortion,
                                  unsigned int *sse1) {
  int bestmse = INT_MAX;
  int_mv startmv;
  int_mv this_mv;
  unsigned char *z = (*(b->base_src) + b->src);
  int left, right, up, down, diag;
  unsigned int sse;
  int whichdir;
  int thismse;
  int y_stride;
  MACROBLOCKD *xd = &x->e_mbd;

#if !CONFIG_SUPERBLOCKS && (ARCH_X86 || ARCH_X86_64)
  unsigned char *y0 = *(d->base_pre) + d->pre +
      (bestmv->as_mv.row) * d->pre_stride + bestmv->as_mv.col;
  unsigned char *y;

  y_stride = 32;
  /* Copy 18 rows x 32 cols area to intermediate buffer before searching. */
  vfp->copymem(y0 - 1 - d->pre_stride, d->pre_stride, xd->y_buf, y_stride, 18);
  y = xd->y_buf + y_stride + 1;
#else
  unsigned char *y = *(d->base_pre) + d->pre +
      (bestmv->as_mv.row) * d->pre_stride + bestmv->as_mv.col;
  y_stride = d->pre_stride;
#endif

  // central mv
  bestmv->as_mv.row <<= 3;
  bestmv->as_mv.col <<= 3;
  startmv = *bestmv;

  // calculate central point error
  bestmse = vfp->vf(y, y_stride, z, b->src_stride, sse1);
  *distortion = bestmse;
  bestmse += mv_err_cost(bestmv, ref_mv, mvcost, error_per_bit,
                         xd->allow_high_precision_mv);

  // go left then right and check error
  this_mv.as_mv.row = startmv.as_mv.row;
  this_mv.as_mv.col = ((startmv.as_mv.col - 8) | 4);
  thismse = vfp->svf_halfpix_h(y - 1, y_stride, z, b->src_stride, &sse);
  left = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (left < bestmse) {
    *bestmv = this_mv;
    bestmse = left;
    *distortion = thismse;
    *sse1 = sse;
  }

  this_mv.as_mv.col += 8;
  thismse = vfp->svf_halfpix_h(y, y_stride, z, b->src_stride, &sse);
  right = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                                xd->allow_high_precision_mv);

  if (right < bestmse) {
    *bestmv = this_mv;
    bestmse = right;
    *distortion = thismse;
    *sse1 = sse;
  }

  // go up then down and check error
  this_mv.as_mv.col = startmv.as_mv.col;
  this_mv.as_mv.row = ((startmv.as_mv.row - 8) | 4);
  thismse = vfp->svf_halfpix_v(y - y_stride, y_stride, z, b->src_stride, &sse);
  up = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                             xd->allow_high_precision_mv);

  if (up < bestmse) {
    *bestmv = this_mv;
    bestmse = up;
    *distortion = thismse;
    *sse1 = sse;
  }

  this_mv.as_mv.row += 8;
  thismse = vfp->svf_halfpix_v(y, y_stride, z, b->src_stride, &sse);
  down = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (down < bestmse) {
    *bestmv = this_mv;
    bestmse = down;
    *distortion = thismse;
    *sse1 = sse;
  }

  // now check 1 more diagonal -
  whichdir = (left < right ? 0 : 1) + (up < down ? 0 : 2);
  this_mv = startmv;

  switch (whichdir) {
    case 0:
      this_mv.as_mv.col = (this_mv.as_mv.col - 8) | 4;
      this_mv.as_mv.row = (this_mv.as_mv.row - 8) | 4;
      thismse = vfp->svf_halfpix_hv(y - 1 - y_stride, y_stride, z, b->src_stride, &sse);
      break;
    case 1:
      this_mv.as_mv.col += 4;
      this_mv.as_mv.row = (this_mv.as_mv.row - 8) | 4;
      thismse = vfp->svf_halfpix_hv(y - y_stride, y_stride, z, b->src_stride, &sse);
      break;
    case 2:
      this_mv.as_mv.col = (this_mv.as_mv.col - 8) | 4;
      this_mv.as_mv.row += 4;
      thismse = vfp->svf_halfpix_hv(y - 1, y_stride, z, b->src_stride, &sse);
      break;
    case 3:
    default:
      this_mv.as_mv.col += 4;
      this_mv.as_mv.row += 4;
      thismse = vfp->svf_halfpix_hv(y, y_stride, z, b->src_stride, &sse);
      break;
  }

  diag = thismse + mv_err_cost(&this_mv, ref_mv, mvcost, error_per_bit,
                               xd->allow_high_precision_mv);

  if (diag < bestmse) {
    *bestmv = this_mv;
    bestmse = diag;
    *distortion = thismse;
    *sse1 = sse;
  }

  return bestmse;
}

#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.as_mv.col < x->mv_col_min) continue;\
    if (this_mv.as_mv.col > x->mv_col_max) continue;\
    if (this_mv.as_mv.row < x->mv_row_min) continue;\
    if (this_mv.as_mv.row > x->mv_row_max) continue;\
  }

#define CHECK_BETTER \
  {\
    if (thissad < bestsad)\
    {\
      thissad += mvsad_err_cost(&this_mv, &fcenter_mv, mvsadcost, sad_per_bit);\
      if (thissad < bestsad)\
      {\
        bestsad = thissad;\
        best_site = i;\
      }\
    }\
  }

static const MV next_chkpts[6][3] = {
  {{ -2, 0}, { -1, -2}, {1, -2}},
  {{ -1, -2}, {1, -2}, {2, 0}},
  {{1, -2}, {2, 0}, {1, 2}},
  {{2, 0}, {1, 2}, { -1, 2}},
  {{1, 2}, { -1, 2}, { -2, 0}},
  {{ -1, 2}, { -2, 0}, { -1, -2}}
};

int vp8_hex_search
(
  MACROBLOCK *x,
  BLOCK *b,
  BLOCKD *d,
  int_mv *ref_mv,
  int_mv *best_mv,
  int search_param,
  int sad_per_bit,
  const vp8_variance_fn_ptr_t *vfp,
  int *mvsadcost[2],
  int *mvcost[2],
  int_mv *center_mv
) {
  MV hex[6] = { { -1, -2}, {1, -2}, {2, 0}, {1, 2}, { -1, 2}, { -2, 0} };
  MV neighbors[4] = {{0, -1}, { -1, 0}, {1, 0}, {0, 1}};
  int i, j;

  unsigned char *what = (*(b->base_src) + b->src);
  int what_stride = b->src_stride;
  int in_what_stride = d->pre_stride;
  int br, bc;
  int_mv this_mv;
  unsigned int bestsad = 0x7fffffff;
  unsigned int thissad;
  unsigned char *base_offset;
  unsigned char *this_offset;
  int k = -1;
  int all_in;
  int best_site = -1;

  int_mv fcenter_mv;
  fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
  fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;

  // adjust ref_mv to make sure it is within MV range
  vp8_clamp_mv(ref_mv, x->mv_col_min, x->mv_col_max, x->mv_row_min, x->mv_row_max);
  br = ref_mv->as_mv.row;
  bc = ref_mv->as_mv.col;

  // Work out the start point for the search
  base_offset = (unsigned char *)(*(d->base_pre) + d->pre);
  this_offset = base_offset + (br * (d->pre_stride)) + bc;
  this_mv.as_mv.row = br;
  this_mv.as_mv.col = bc;
  bestsad = vfp->sdf(what, what_stride, this_offset,
                     in_what_stride, 0x7fffffff)
            + mvsad_err_cost(&this_mv, &fcenter_mv, mvsadcost, sad_per_bit);

  // hex search
  // j=0
  CHECK_BOUNDS(2)

  if (all_in) {
    for (i = 0; i < 6; i++) {
      this_mv.as_mv.row = br + hex[i].row;
      this_mv.as_mv.col = bc + hex[i].col;
      this_offset = base_offset + (this_mv.as_mv.row * in_what_stride) + this_mv.as_mv.col;
      thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride, bestsad);
      CHECK_BETTER
    }
  } else {
    for (i = 0; i < 6; i++) {
      this_mv.as_mv.row = br + hex[i].row;
      this_mv.as_mv.col = bc + hex[i].col;
      CHECK_POINT
      this_offset = base_offset + (this_mv.as_mv.row * in_what_stride) + this_mv.as_mv.col;
      thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride, bestsad);
      CHECK_BETTER
    }
  }

  if (best_site == -1)
    goto cal_neighbors;
  else {
    br += hex[best_site].row;
    bc += hex[best_site].col;
    k = best_site;
  }

  for (j = 1; j < 127; j++) {
    best_site = -1;
    CHECK_BOUNDS(2)

    if (all_in) {
      for (i = 0; i < 3; i++) {
        this_mv.as_mv.row = br + next_chkpts[k][i].row;
        this_mv.as_mv.col = bc + next_chkpts[k][i].col;
        this_offset = base_offset + (this_mv.as_mv.row * (in_what_stride)) + this_mv.as_mv.col;
        thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride, bestsad);
        CHECK_BETTER
      }
    } else {
      for (i = 0; i < 3; i++) {
        this_mv.as_mv.row = br + next_chkpts[k][i].row;
        this_mv.as_mv.col = bc + next_chkpts[k][i].col;
        CHECK_POINT
        this_offset = base_offset + (this_mv.as_mv.row * (in_what_stride)) + this_mv.as_mv.col;
        thissad = vfp->sdf(what, what_stride, this_offset, in_what_stride, bestsad);
        CHECK_BETTER
      }
    }

    if (best_site == -1)
      break;
    else {
      br += next_chkpts[k][best_site].row;
      bc += next_chkpts[k][best_site].col;
      k += 5 + best_site;
      if (k >= 12) k -= 12;
      else if (k >= 6) k -= 6;
    }
  }

  // check 4 1-away neighbors
cal_neighbors:
  for (j = 0; j < 32; j++) {
    best_site = -1;
    CHECK_BOUNDS(1)

    if (all_in) {
      for (i = 0; i < 4; i++) {
        this_mv.as_mv.row = br + neighbors[i].row;
        this_mv.as_mv.col = bc + neighbors[i].col;
        this_offset = base_offset + (this_mv.as_mv.row * (in_what_stride)) + this_mv.as_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.as_mv.row = br + neighbors[i].row;
        this_mv.as_mv.col = bc + neighbors[i].col;
        CHECK_POINT
        this_offset = base_offset + (this_mv.as_mv.row * (in_what_stride)) + this_mv.as_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->as_mv.row = br;
  best_mv->as_mv.col = bc;

  return bestsad;
}
#undef CHECK_BOUNDS
#undef CHECK_POINT
#undef CHECK_BETTER

int vp8_diamond_search_sad(MACROBLOCK *x, BLOCK *b, BLOCKD *d,
                           int_mv *ref_mv, int_mv *best_mv,
                           int search_param, int sad_per_bit, int *num00,
                           vp8_variance_fn_ptr_t *fn_ptr, int *mvcost[2],
                           int_mv *center_mv) {
  int i, j, step;

  unsigned char *what = (*(b->base_src) + b->src);
  int what_stride = b->src_stride;
  unsigned char *in_what;
  int in_what_stride = d->pre_stride;
  unsigned char *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;

  unsigned char *check_here;
  int thissad;
  MACROBLOCKD *xd = &x->e_mbd;

  int *mvsadcost[2] = {x->mvsadcost[0], x->mvsadcost[1]};
  int_mv fcenter_mv;

  if (xd->allow_high_precision_mv) {
    mvsadcost[0] = x->mvsadcost_hp[0];
    mvsadcost[1] = x->mvsadcost_hp[1];
  }
  fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
  fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;

  vp8_clamp_mv(ref_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 = (unsigned char *)(*(d->base_pre) + d->pre + (ref_row * (d->pre_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, &fcenter_mv, 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, &fcenter_mv,
                                    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;
    } else if (best_address == in_what)
      (*num00)++;
  }

  this_mv.as_mv.row = best_mv->as_mv.row << 3;
  this_mv.as_mv.col = best_mv->as_mv.col << 3;

  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, center_mv, mvcost, x->errorperbit,
                  xd->allow_high_precision_mv);
}

int vp8_diamond_search_sadx4(MACROBLOCK *x, BLOCK *b, BLOCKD *d,
                             int_mv *ref_mv, int_mv *best_mv, int search_param,
                             int sad_per_bit, int *num00,
                             vp8_variance_fn_ptr_t *fn_ptr,
                             int *mvcost[2], int_mv *center_mv) {
  int i, j, step;

  unsigned char *what = (*(b->base_src) + b->src);
  int what_stride = b->src_stride;
  unsigned char *in_what;
  int in_what_stride = d->pre_stride;
  unsigned char *best_address;

  int tot_steps;
  int_mv this_mv;

  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;

  unsigned char *check_here;
  unsigned int thissad;
  MACROBLOCKD *xd = &x->e_mbd;

  int *mvsadcost[2] = {x->mvsadcost[0], x->mvsadcost[1]};
  int_mv fcenter_mv;

  if (xd->allow_high_precision_mv) {
    mvsadcost[0] = x->mvsadcost_hp[0];
    mvsadcost[1] = x->mvsadcost_hp[1];
  }
  fcenter_mv.as_mv.row = center_mv->as_mv.row >> 3;
  fcenter_mv.as_mv.col = center_mv->as_mv.col >> 3;

  vp8_clamp_mv(ref_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 = (unsigned char *)(*(d->base_pre) + d->pre + (ref_row * (d->pre_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, &fcenter_mv, 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++) {
    int all_in = 1, t;

    // To know if all neighbor points are within the bounds, 4 bounds checking are enough instead of
    // checking 4 bounds for each points.
    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_in) {
      unsigned int sad_array[4];

      for (j = 0; j < x->searches_per_step; j += 4) {
        unsigned char *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, &fcenter_mv,
                                           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, &fcenter_mv,
                                      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;
    } else if (best_address == in_what)
      (*num00)++;
  }

  this_mv.as_mv.row = best_mv->as_mv.row << 3;
  this_mv.as_mv.col = best_mv->as_mv.col << 3;

  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, center_mv, mvcost, x->errorperbit,
                  xd->allow_high_precision_mv);
}

#define XMVCOST (x->e_mbd.allow_high_precision_mv?x->mvcost_hp:x->mvcost)
/* 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 vp8_full_pixel_diamond(VP8_COMP *cpi, MACROBLOCK *x, BLOCK *b,
                           BLOCKD *d, int_mv *mvp_full, int step_param,
                           int sadpb, int further_steps,
                           int do_refine, vp8_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, b, d, mvp_full, &temp_mv,
                                        step_param, sadpb, &num00,
                                        fn_ptr, XMVCOST, 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, b, d, mvp_full, &temp_mv,
                                        step_param + n, sadpb, &num00,
                                        fn_ptr, XMVCOST, 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, b, d, &best_mv, sadpb, search_range,
                                       fn_ptr, XMVCOST, ref_mv);

    if (thissme < bestsme) {
      bestsme = thissme;
      dst_mv->as_int = best_mv.as_int;
    }
  }
  return bestsme;
}

int vp8_full_search_sad(MACROBLOCK *x, BLOCK *b, BLOCKD *d, int_mv *ref_mv,
                        int sad_per_bit, int distance,
                        vp8_variance_fn_ptr_t *fn_ptr, int *mvcost[2],
                        int_mv *center_mv) {
  unsigned char *what = (*(b->base_src) + b->src);
  int what_stride = b->src_stride;
  unsigned char *in_what;
  int in_what_stride = d->pre_stride;
  int mv_stride = d->pre_stride;
  unsigned char *bestaddress;
  int_mv *best_mv = &d->bmi.as_mv.first;
  int_mv this_mv;
  int bestsad = INT_MAX;
  int r, c;

  unsigned char *check_here;
  int thissad;
  MACROBLOCKD *xd = &x->e_mbd;

  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 *mvsadcost[2] = {x->mvsadcost[0], x->mvsadcost[1]};
  int_mv fcenter_mv;

  if (xd->allow_high_precision_mv) {
    mvsadcost[0] = x->mvsadcost_hp[0];
    mvsadcost[1] = x->mvsadcost_hp[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 = *(d->base_pre) + d->pre;
  bestaddress = in_what + (ref_row * d->pre_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, &fcenter_mv, mvsadcost, sad_per_bit);

  // Apply further limits to prevent us looking using vectors that stretch beyiond the UMV border
  if (col_min < x->mv_col_min)
    col_min = x->mv_col_min;

  if (col_max > x->mv_col_max)
    col_max = x->mv_col_max;

  if (row_min < x->mv_row_min)
    row_min = x->mv_row_min;

  if (row_max > x->mv_row_max)
    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, &fcenter_mv,
                                 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 << 3;
  this_mv.as_mv.col = best_mv->as_mv.col << 3;

  if (bestsad < INT_MAX)
    return
        fn_ptr->vf(what, what_stride, bestaddress, in_what_stride,
                   (unsigned int *)(&thissad)) +
        mv_err_cost(&this_mv, center_mv, mvcost, x->errorperbit,
                    xd->allow_high_precision_mv);
  else
    return INT_MAX;
}

int vp8_full_search_sadx3(MACROBLOCK *x, BLOCK *b, BLOCKD *d, int_mv *ref_mv,
                          int sad_per_bit, int distance,
                          vp8_variance_fn_ptr_t *fn_ptr, int *mvcost[2],
                          int_mv *center_mv) {
  unsigned char *what = (*(b->base_src) + b->src);
  int what_stride = b->src_stride;
  unsigned char *in_what;
  int in_what_stride = d->pre_stride;
  int mv_stride = d->pre_stride;
  unsigned char *bestaddress;
  int_mv *best_mv = &d->bmi.as_mv.first;
  int_mv this_mv;
  int bestsad = INT_MAX;
  int r, c;

  unsigned char *check_here;
  unsigned int thissad;
  MACROBLOCKD *xd = &x->e_mbd;

  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 *mvsadcost[2] = {x->mvsadcost[0], x->mvsadcost[1]};
  int_mv fcenter_mv;

  if (xd->allow_high_precision_mv) {
    mvsadcost[0] = x->mvsadcost_hp[0];
    mvsadcost[1] = x->mvsadcost_hp[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 = *(d->base_pre) + d->pre;
  bestaddress = in_what + (ref_row * d->pre_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, &fcenter_mv, mvsadcost, sad_per_bit);

  // Apply further limits to prevent us looking using vectors that stretch beyiond the UMV border
  if (col_min < x->mv_col_min)
    col_min = x->mv_col_min;

  if (col_max > x->mv_col_max)
    col_max = x->mv_col_max;

  if (row_min < x->mv_row_min)
    row_min = x->mv_row_min;

  if (row_max > x->mv_row_max)
    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, &fcenter_mv,
                                     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, &fcenter_mv,
                                   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 << 3;
  this_mv.as_mv.col = best_mv->as_mv.col << 3;

  if (bestsad < INT_MAX)
    return
        fn_ptr->vf(what, what_stride, bestaddress, in_what_stride,
                   (unsigned int *)(&thissad)) +
        mv_err_cost(&this_mv, center_mv, mvcost, x->errorperbit,
                    xd->allow_high_precision_mv);
  else
    return INT_MAX;
}

int vp8_full_search_sadx8(MACROBLOCK *x, BLOCK *b, BLOCKD *d, int_mv *ref_mv,
                          int sad_per_bit, int distance,
                          vp8_variance_fn_ptr_t *fn_ptr, int *mvcost[2],
                          int_mv *center_mv) {
  unsigned char *what = (*(b->base_src) + b->src);
  int what_stride = b->src_stride;
  unsigned char *in_what;
  int in_what_stride = d->pre_stride;
  int mv_stride = d->pre_stride;
  unsigned char *bestaddress;
  int_mv *best_mv = &d->bmi.as_mv.first;
  int_mv this_mv;
  int bestsad = INT_MAX;
  int r, c;

  unsigned char *check_here;
  unsigned int thissad;
  MACROBLOCKD *xd = &x->e_mbd;

  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, unsigned short, sad_array8, 8);
  unsigned int sad_array[3];

  int *mvsadcost[2] = {x->mvsadcost[0], x->mvsadcost[1]};
  int_mv fcenter_mv;

  if (xd->allow_high_precision_mv) {
    mvsadcost[0] = x->mvsadcost_hp[0];
    mvsadcost[1] = x->mvsadcost_hp[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 = *(d->base_pre) + d->pre;
  bestaddress = in_what + (ref_row * d->pre_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, &fcenter_mv, mvsadcost, sad_per_bit);

  // Apply further limits to prevent us looking using vectors that stretch beyiond the UMV border
  if (col_min < x->mv_col_min)
    col_min = x->mv_col_min;

  if (col_max > x->mv_col_max)
    col_max = x->mv_col_max;

  if (row_min < x->mv_row_min)
    row_min = x->mv_row_min;

  if (row_max > x->mv_row_max)
    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, &fcenter_mv,
                                     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) {
      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, &fcenter_mv,
                                     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, &fcenter_mv,
                                   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 << 3;
  this_mv.as_mv.col = best_mv->as_mv.col << 3;

  if (bestsad < INT_MAX)
    return
        fn_ptr->vf(what, what_stride, bestaddress, in_what_stride,
                   (unsigned int *)(&thissad)) +
        mv_err_cost(&this_mv, center_mv, mvcost, x->errorperbit,
                    xd->allow_high_precision_mv);
  else
    return INT_MAX;
}

int vp8_refining_search_sad(MACROBLOCK *x, BLOCK *b, BLOCKD *d, int_mv *ref_mv,
                            int error_per_bit, int search_range,
                            vp8_variance_fn_ptr_t *fn_ptr, int *mvcost[2],
                            int_mv *center_mv) {
  MV neighbors[4] = {{ -1, 0}, {0, -1}, {0, 1}, {1, 0}};
  int i, j;
  short this_row_offset, this_col_offset;

  int what_stride = b->src_stride;
  int in_what_stride = d->pre_stride;
  unsigned char *what = (*(b->base_src) + b->src);
  unsigned char *best_address = (unsigned char *)(*(d->base_pre) + d->pre +
                                                  (ref_mv->as_mv.row * (d->pre_stride)) + ref_mv->as_mv.col);
  unsigned char *check_here;
  unsigned int thissad;
  int_mv this_mv;
  unsigned int bestsad = INT_MAX;
  MACROBLOCKD *xd = &x->e_mbd;

  int *mvsadcost[2] = {x->mvsadcost[0], x->mvsadcost[1]};
  int_mv fcenter_mv;

  if (xd->allow_high_precision_mv) {
    mvsadcost[0] = x->mvsadcost_hp[0];
    mvsadcost[1] = x->mvsadcost_hp[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, &fcenter_mv, 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, &fcenter_mv, 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 << 3;
  this_mv.as_mv.col = ref_mv->as_mv.col << 3;

  if (bestsad < INT_MAX)
    return
        fn_ptr->vf(what, what_stride, best_address, in_what_stride,
                   (unsigned int *)(&thissad)) +
        mv_err_cost(&this_mv, center_mv, mvcost, x->errorperbit,
                    xd->allow_high_precision_mv);
  else
    return INT_MAX;
}

int vp8_refining_search_sadx4(MACROBLOCK *x, BLOCK *b, BLOCKD *d,
                              int_mv *ref_mv, int error_per_bit,
                              int search_range, vp8_variance_fn_ptr_t *fn_ptr,
                              int *mvcost[2], int_mv *center_mv) {
  MV neighbors[4] = {{ -1, 0}, {0, -1}, {0, 1}, {1, 0}};
  int i, j;
  short this_row_offset, this_col_offset;

  int what_stride = b->src_stride;
  int in_what_stride = d->pre_stride;
  unsigned char *what = (*(b->base_src) + b->src);
  unsigned char *best_address = (unsigned char *)(*(d->base_pre) + d->pre +
                                                  (ref_mv->as_mv.row * (d->pre_stride)) + ref_mv->as_mv.col);
  unsigned char *check_here;
  unsigned int thissad;
  int_mv this_mv;
  unsigned int bestsad = INT_MAX;
  MACROBLOCKD *xd = &x->e_mbd;

  int *mvsadcost[2] = {x->mvsadcost[0], x->mvsadcost[1]};
  int_mv fcenter_mv;

  if (xd->allow_high_precision_mv) {
    mvsadcost[0] = x->mvsadcost_hp[0];
    mvsadcost[1] = x->mvsadcost_hp[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, &fcenter_mv, mvsadcost, error_per_bit);

  for (i = 0; i < search_range; i++) {
    int best_site = -1;
    int all_in = 1;

    all_in &= ((ref_mv->as_mv.row - 1) > x->mv_row_min);
    all_in &= ((ref_mv->as_mv.row + 1) < x->mv_row_max);
    all_in &= ((ref_mv->as_mv.col - 1) > x->mv_col_min);
    all_in &= ((ref_mv->as_mv.col + 1) < x->mv_col_max);

    if (all_in) {
      unsigned int sad_array[4];
      unsigned char *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, &fcenter_mv, 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, &fcenter_mv, 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 << 3;
  this_mv.as_mv.col = ref_mv->as_mv.col << 3;

  if (bestsad < INT_MAX)
    return
        fn_ptr->vf(what, what_stride, best_address, in_what_stride,
                   (unsigned int *)(&thissad)) +
        mv_err_cost(&this_mv, center_mv, mvcost, x->errorperbit,
                    xd->allow_high_precision_mv);
  else
    return INT_MAX;
}



#ifdef ENTROPY_STATS
void print_mode_context(void) {
  FILE *f = fopen("modecont.c", "a");
  int i, j;

  fprintf(f, "#include \"entropy.h\"\n");
  fprintf(f, "const int vp8_mode_contexts[6][4] =");
  fprintf(f, "{\n");
  for (j = 0; j < 6; j++) {
    fprintf(f, "  {/* %d */ ", j);
    fprintf(f, "    ");
    for (i = 0; i < 4; i++) {
      int this_prob;
      int count;

      // context probs
      count = mv_ref_ct[j][i][0] + mv_ref_ct[j][i][1];
      if (count)
        this_prob = 256 * mv_ref_ct[j][i][0] / count;
      else
        this_prob = 128;

      if (this_prob == 0)
        this_prob = 1;
      fprintf(f, "%5d, ", this_prob);
    }
    fprintf(f, "  },\n");
  }

  fprintf(f, "};\n");
  fclose(f);
}

/* MV ref count ENTROPY_STATS stats code */
void init_mv_ref_counts() {
  vpx_memset(mv_ref_ct, 0, sizeof(mv_ref_ct));
  vpx_memset(mv_mode_cts, 0, sizeof(mv_mode_cts));
}

void accum_mv_refs(MB_PREDICTION_MODE m, const int ct[4]) {
  if (m == ZEROMV) {
    ++mv_ref_ct [ct[0]] [0] [0];
    ++mv_mode_cts[0][0];
  } else {
    ++mv_ref_ct [ct[0]] [0] [1];
    ++mv_mode_cts[0][1];

    if (m == NEARESTMV) {
      ++mv_ref_ct [ct[1]] [1] [0];
      ++mv_mode_cts[1][0];
    } else {
      ++mv_ref_ct [ct[1]] [1] [1];
      ++mv_mode_cts[1][1];

      if (m == NEARMV) {
        ++mv_ref_ct [ct[2]] [2] [0];
        ++mv_mode_cts[2][0];
      } else {
        ++mv_ref_ct [ct[2]] [2] [1];
        ++mv_mode_cts[2][1];

        if (m == NEWMV) {
          ++mv_ref_ct [ct[3]] [3] [0];
          ++mv_mode_cts[3][0];
        } else {
          ++mv_ref_ct [ct[3]] [3] [1];
          ++mv_mode_cts[3][1];
        }
      }
    }
  }
}

#endif/* END MV ref count ENTROPY_STATS stats code */