/src/libvpx/vp8/encoder/rdopt.c

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/*
 *  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 <assert.h>
#include <stdio.h>
#include <math.h>
#include <limits.h>
#include <assert.h>
#include "vpx_config.h"
#include "vp8_rtcd.h"
#include "./vpx_dsp_rtcd.h"
#include "encodeframe.h"
#include "tokenize.h"
#include "treewriter.h"
#include "onyx_int.h"
#include "modecosts.h"
#include "encodeintra.h"
#include "pickinter.h"
#include "vp8/common/common.h"
#include "vp8/common/entropymode.h"
#include "vp8/common/reconinter.h"
#include "vp8/common/reconintra.h"
#include "vp8/common/reconintra4x4.h"
#include "vp8/common/findnearmv.h"
#include "vp8/common/quant_common.h"
#include "encodemb.h"
#include "vp8/encoder/quantize.h"
#include "vpx_dsp/variance.h"
#include "vpx_ports/system_state.h"
#include "mcomp.h"
#include "rdopt.h"
#include "vpx_mem/vpx_mem.h"
#include "vp8/common/systemdependent.h"
#if CONFIG_TEMPORAL_DENOISING
#include "denoising.h"
#endif
extern void vp8_update_zbin_extra(VP8_COMP *cpi, MACROBLOCK *x);

#define MAXF(a, b) (((a) > (b)) ? (a) : (b))

typedef struct rate_distortion_struct {
  int rate2;
  int rate_y;
  int rate_uv;
  int distortion2;
  int distortion_uv;
} RATE_DISTORTION;

typedef struct best_mode_struct {
  int yrd;
  int rd;
  int intra_rd;
  MB_MODE_INFO mbmode;
  union b_mode_info bmodes[16];
  PARTITION_INFO partition;
} BEST_MODE;

static const int auto_speed_thresh[17] = { 1000, 200, 150, 130, 150, 125,
                                           120,  115, 115, 115, 115, 115,
                                           115,  115, 115, 115, 105 };

const MB_PREDICTION_MODE vp8_mode_order[MAX_MODES] = {
  ZEROMV,    DC_PRED,

  NEARESTMV, NEARMV,

  ZEROMV,    NEARESTMV,

  ZEROMV,    NEARESTMV,

  NEARMV,    NEARMV,

  V_PRED,    H_PRED,    TM_PRED,

  NEWMV,     NEWMV,     NEWMV,

  SPLITMV,   SPLITMV,   SPLITMV,

  B_PRED,
};

/* This table determines the search order in reference frame priority order,
 * which may not necessarily match INTRA,LAST,GOLDEN,ARF
 */
const int vp8_ref_frame_order[MAX_MODES] = {
  1, 0,

  1, 1,

  2, 2,

  3, 3,

  2, 3,

  0, 0, 0,

  1, 2, 3,

  1, 2, 3,

  0,
};

static void fill_token_costs(
    int c[BLOCK_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS][MAX_ENTROPY_TOKENS],
    const vp8_prob p[BLOCK_TYPES][COEF_BANDS][PREV_COEF_CONTEXTS]
                    [ENTROPY_NODES]) {
  int i, j, k;

  for (i = 0; i < BLOCK_TYPES; ++i) {
    for (j = 0; j < COEF_BANDS; ++j) {
      for (k = 0; k < PREV_COEF_CONTEXTS; ++k) {
        /* check for pt=0 and band > 1 if block type 0
         * and 0 if blocktype 1
         */
        if (k == 0 && j > (i == 0)) {
          vp8_cost_tokens2(c[i][j][k], p[i][j][k], vp8_coef_tree, 2);
        } else {
          vp8_cost_tokens(c[i][j][k], p[i][j][k], vp8_coef_tree);
        }
      }
    }
  }
}

static const int rd_iifactor[32] = { 4, 4, 3, 2, 1, 0, 0, 0, 0, 0, 0,
                                     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
                                     0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

/* values are now correlated to quantizer */
static const int sad_per_bit16lut[QINDEX_RANGE] = {
  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  3,  3,  3,
  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,  4,  4,  4,  4,
  4,  4,  4,  4,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  6,  6,  6,
  6,  6,  6,  6,  6,  6,  6,  6,  6,  7,  7,  7,  7,  7,  7,  7,  7,  7,  7,
  7,  7,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  8,  9,  9,  9,  9,  9,
  9,  9,  9,  9,  9,  9,  9,  10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11,
  11, 11, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13, 14, 14
};
static const int sad_per_bit4lut[QINDEX_RANGE] = {
  2,  2,  2,  2,  2,  2,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,
  3,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  5,  5,  5,  5,  5,  5,  6,  6,
  6,  6,  6,  6,  6,  6,  6,  6,  6,  6,  7,  7,  7,  7,  7,  7,  7,  7,  7,
  7,  7,  7,  7,  8,  8,  8,  8,  8,  9,  9,  9,  9,  9,  9,  10, 10, 10, 10,
  10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12,
  12, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16,
  16, 16, 17, 17, 17, 18, 18, 18, 19, 19, 19, 20, 20, 20,
};

void vp8cx_initialize_me_consts(VP8_COMP *cpi, int QIndex) {
  cpi->mb.sadperbit16 = sad_per_bit16lut[QIndex];
  cpi->mb.sadperbit4 = sad_per_bit4lut[QIndex];
}

void vp8_initialize_rd_consts(VP8_COMP *cpi, MACROBLOCK *x, int Qvalue) {
  int q;
  int i;
  double capped_q = (Qvalue < 160) ? (double)Qvalue : 160.0;
  double rdconst = 2.80;

  vpx_clear_system_state();

  /* Further tests required to see if optimum is different
   * for key frames, golden frames and arf frames.
   */
  cpi->RDMULT = (int)(rdconst * (capped_q * capped_q));

  /* Extend rate multiplier along side quantizer zbin increases */
  if (cpi->mb.zbin_over_quant > 0) {
    double oq_factor;
    double modq;

    /* Experimental code using the same basic equation as used for Q above
     * The units of cpi->mb.zbin_over_quant are 1/128 of Q bin size
     */
    oq_factor = 1.0 + ((double)0.0015625 * cpi->mb.zbin_over_quant);
    modq = (int)((double)capped_q * oq_factor);
    cpi->RDMULT = (int)(rdconst * (modq * modq));
  }

  if (cpi->pass == 2 && (cpi->common.frame_type != KEY_FRAME)) {
    if (cpi->twopass.next_iiratio > 31) {
      cpi->RDMULT += (cpi->RDMULT * rd_iifactor[31]) >> 4;
    } else {
      cpi->RDMULT +=
          (cpi->RDMULT * rd_iifactor[cpi->twopass.next_iiratio]) >> 4;
    }
  }

  cpi->mb.errorperbit = (cpi->RDMULT / 110);
  cpi->mb.errorperbit += (cpi->mb.errorperbit == 0);

  vp8_set_speed_features(cpi);

  for (i = 0; i < MAX_MODES; ++i) {
    x->mode_test_hit_counts[i] = 0;
  }

  q = (int)pow(Qvalue, 1.25);

  if (q < 8) q = 8;

  if (cpi->RDMULT > 1000) {
    cpi->RDDIV = 1;
    cpi->RDMULT /= 100;

    for (i = 0; i < MAX_MODES; ++i) {
      if (cpi->sf.thresh_mult[i] < INT_MAX) {
        x->rd_threshes[i] = cpi->sf.thresh_mult[i] * q / 100;
      } else {
        x->rd_threshes[i] = INT_MAX;
      }

      cpi->rd_baseline_thresh[i] = x->rd_threshes[i];
    }
  } else {
    cpi->RDDIV = 100;

    for (i = 0; i < MAX_MODES; ++i) {
      if (cpi->sf.thresh_mult[i] < (INT_MAX / q)) {
        x->rd_threshes[i] = cpi->sf.thresh_mult[i] * q;
      } else {
        x->rd_threshes[i] = INT_MAX;
      }

      cpi->rd_baseline_thresh[i] = x->rd_threshes[i];
    }
  }

  {
    /* build token cost array for the type of frame we have now */
    FRAME_CONTEXT *l = &cpi->lfc_n;

    if (cpi->common.refresh_alt_ref_frame) {
      l = &cpi->lfc_a;
    } else if (cpi->common.refresh_golden_frame) {
      l = &cpi->lfc_g;
    }

    fill_token_costs(cpi->mb.token_costs,
                     (const vp8_prob(*)[8][3][11])l->coef_probs);
    /*
    fill_token_costs(
        cpi->mb.token_costs,
        (const vp8_prob( *)[8][3][11]) cpi->common.fc.coef_probs);
    */

    /* TODO make these mode costs depend on last,alt or gold too.  (jbb) */
    vp8_init_mode_costs(cpi);
  }
}

void vp8_auto_select_speed(VP8_COMP *cpi) {
  int milliseconds_for_compress = (int)(1000000 / cpi->framerate);

  milliseconds_for_compress =
      milliseconds_for_compress * (16 - cpi->oxcf.cpu_used) / 16;

#if 0

    if (0)
    {
        FILE *f;

        f = fopen("speed.stt", "a");
        fprintf(f, " %8ld %10ld %10ld %10ld\n",
                cpi->common.current_video_frame, cpi->Speed, milliseconds_for_compress, cpi->avg_pick_mode_time);
        fclose(f);
    }

#endif

  if (cpi->avg_pick_mode_time < milliseconds_for_compress &&
      (cpi->avg_encode_time - cpi->avg_pick_mode_time) <
          milliseconds_for_compress) {
    if (cpi->avg_pick_mode_time == 0) {
      cpi->Speed = 4;
    } else {
      if (milliseconds_for_compress * 100 < cpi->avg_encode_time * 95) {
        cpi->Speed += 2;
        cpi->avg_pick_mode_time = 0;
        cpi->avg_encode_time = 0;

        if (cpi->Speed > 16) {
          cpi->Speed = 16;
        }
      }

      if (milliseconds_for_compress * 100 >
          cpi->avg_encode_time * auto_speed_thresh[cpi->Speed]) {
        cpi->Speed -= 1;
        cpi->avg_pick_mode_time = 0;
        cpi->avg_encode_time = 0;

        /* In real-time mode, cpi->speed is in [4, 16]. */
        if (cpi->Speed < 4) {
          cpi->Speed = 4;
        }
      }
    }
  } else {
    cpi->Speed += 4;

    if (cpi->Speed > 16) cpi->Speed = 16;

    cpi->avg_pick_mode_time = 0;
    cpi->avg_encode_time = 0;
  }
}

int vp8_block_error_c(short *coeff, short *dqcoeff) {
  int i;
  int error = 0;

  for (i = 0; i < 16; ++i) {
    int this_diff = coeff[i] - dqcoeff[i];
    error += this_diff * this_diff;
  }

  return error;
}

int vp8_mbblock_error_c(MACROBLOCK *mb, int dc) {
  BLOCK *be;
  BLOCKD *bd;
  int i, j;
  int berror, error = 0;

  for (i = 0; i < 16; ++i) {
    be = &mb->block[i];
    bd = &mb->e_mbd.block[i];

    berror = 0;

    for (j = dc; j < 16; ++j) {
      int this_diff = be->coeff[j] - bd->dqcoeff[j];
      berror += this_diff * this_diff;
    }

    error += berror;
  }

  return error;
}

int vp8_mbuverror_c(MACROBLOCK *mb) {
  BLOCK *be;
  BLOCKD *bd;

  int i;
  int error = 0;

  for (i = 16; i < 24; ++i) {
    be = &mb->block[i];
    bd = &mb->e_mbd.block[i];

    error += vp8_block_error_c(be->coeff, bd->dqcoeff);
  }

  return error;
}

int VP8_UVSSE(MACROBLOCK *x) {
  unsigned char *uptr, *vptr;
  unsigned char *upred_ptr = (*(x->block[16].base_src) + x->block[16].src);
  unsigned char *vpred_ptr = (*(x->block[20].base_src) + x->block[20].src);
  int uv_stride = x->block[16].src_stride;

  unsigned int sse1 = 0;
  unsigned int sse2 = 0;
  int mv_row = x->e_mbd.mode_info_context->mbmi.mv.as_mv.row;
  int mv_col = x->e_mbd.mode_info_context->mbmi.mv.as_mv.col;
  int offset;
  int pre_stride = x->e_mbd.pre.uv_stride;

  if (mv_row < 0) {
    mv_row -= 1;
  } else {
    mv_row += 1;
  }

  if (mv_col < 0) {
    mv_col -= 1;
  } else {
    mv_col += 1;
  }

  mv_row /= 2;
  mv_col /= 2;

  offset = (mv_row >> 3) * pre_stride + (mv_col >> 3);
  uptr = x->e_mbd.pre.u_buffer + offset;
  vptr = x->e_mbd.pre.v_buffer + offset;

  if ((mv_row | mv_col) & 7) {
    vpx_sub_pixel_variance8x8(uptr, pre_stride, mv_col & 7, mv_row & 7,
                              upred_ptr, uv_stride, &sse2);
    vpx_sub_pixel_variance8x8(vptr, pre_stride, mv_col & 7, mv_row & 7,
                              vpred_ptr, uv_stride, &sse1);
    sse2 += sse1;
  } else {
    vpx_variance8x8(uptr, pre_stride, upred_ptr, uv_stride, &sse2);
    vpx_variance8x8(vptr, pre_stride, vpred_ptr, uv_stride, &sse1);
    sse2 += sse1;
  }
  return sse2;
}

static int cost_coeffs(MACROBLOCK *mb, BLOCKD *b, int type, ENTROPY_CONTEXT *a,
                       ENTROPY_CONTEXT *l) {
  int c = !type; /* start at coef 0, unless Y with Y2 */
  int eob = (int)(*b->eob);
  int pt; /* surrounding block/prev coef predictor */
  int cost = 0;
  short *qcoeff_ptr = b->qcoeff;

  VP8_COMBINEENTROPYCONTEXTS(pt, *a, *l);

  assert(eob <= 16);
  for (; c < eob; ++c) {
    const int v = qcoeff_ptr[vp8_default_zig_zag1d[c]];
    const int t = vp8_dct_value_tokens_ptr[v].Token;
    cost += mb->token_costs[type][vp8_coef_bands[c]][pt][t];
    cost += vp8_dct_value_cost_ptr[v];
    pt = vp8_prev_token_class[t];
  }

  if (c < 16) {
    cost += mb->token_costs[type][vp8_coef_bands[c]][pt][DCT_EOB_TOKEN];
  }

  pt = (c != !type); /* is eob first coefficient; */
  *a = *l = pt;

  return cost;
}

static int vp8_rdcost_mby(MACROBLOCK *mb) {
  int cost = 0;
  int b;
  MACROBLOCKD *x = &mb->e_mbd;
  ENTROPY_CONTEXT_PLANES t_above, t_left;
  ENTROPY_CONTEXT *ta;
  ENTROPY_CONTEXT *tl;

  t_above = *mb->e_mbd.above_context;
  t_left = *mb->e_mbd.left_context;

  ta = (ENTROPY_CONTEXT *)&t_above;
  tl = (ENTROPY_CONTEXT *)&t_left;

  for (b = 0; b < 16; ++b) {
    cost += cost_coeffs(mb, x->block + b, PLANE_TYPE_Y_NO_DC,
                        ta + vp8_block2above[b], tl + vp8_block2left[b]);
  }

  cost += cost_coeffs(mb, x->block + 24, PLANE_TYPE_Y2,
                      ta + vp8_block2above[24], tl + vp8_block2left[24]);

  return cost;
}

static void macro_block_yrd(MACROBLOCK *mb, int *Rate, int *Distortion) {
  int b;
  MACROBLOCKD *const x = &mb->e_mbd;
  BLOCK *const mb_y2 = mb->block + 24;
  BLOCKD *const x_y2 = x->block + 24;
  short *Y2DCPtr = mb_y2->src_diff;
  BLOCK *beptr;
  int d;

  vp8_subtract_mby(mb->src_diff, *(mb->block[0].base_src),
                   mb->block[0].src_stride, mb->e_mbd.predictor, 16);

  /* Fdct and building the 2nd order block */
  for (beptr = mb->block; beptr < mb->block + 16; beptr += 2) {
    mb->short_fdct8x4(beptr->src_diff, beptr->coeff, 32);
    *Y2DCPtr++ = beptr->coeff[0];
    *Y2DCPtr++ = beptr->coeff[16];
  }

  /* 2nd order fdct */
  mb->short_walsh4x4(mb_y2->src_diff, mb_y2->coeff, 8);

  /* Quantization */
  for (b = 0; b < 16; ++b) {
    mb->quantize_b(&mb->block[b], &mb->e_mbd.block[b]);
  }

  /* DC predication and Quantization of 2nd Order block */
  mb->quantize_b(mb_y2, x_y2);

  /* Distortion */
  d = vp8_mbblock_error(mb, 1) << 2;
  d += vp8_block_error(mb_y2->coeff, x_y2->dqcoeff);

  *Distortion = (d >> 4);

  /* rate */
  *Rate = vp8_rdcost_mby(mb);
}

static void copy_predictor(unsigned char *dst, const unsigned char *predictor) {
  const unsigned int *p = (const unsigned int *)predictor;
  unsigned int *d = (unsigned int *)dst;
  d[0] = p[0];
  d[4] = p[4];
  d[8] = p[8];
  d[12] = p[12];
}
static int rd_pick_intra4x4block(MACROBLOCK *x, BLOCK *be, BLOCKD *b,
                                 B_PREDICTION_MODE *best_mode,
                                 const int *bmode_costs, ENTROPY_CONTEXT *a,
                                 ENTROPY_CONTEXT *l,

                                 int *bestrate, int *bestratey,
                                 int *bestdistortion) {
  B_PREDICTION_MODE mode;
  int best_rd = INT_MAX;
  int rate = 0;
  int distortion;

  ENTROPY_CONTEXT ta = *a, tempa = *a;
  ENTROPY_CONTEXT tl = *l, templ = *l;
  /*
   * The predictor buffer is a 2d buffer with a stride of 16.  Create
   * a temp buffer that meets the stride requirements, but we are only
   * interested in the left 4x4 block
   * */
  DECLARE_ALIGNED(16, unsigned char, best_predictor[16 * 4]);
  DECLARE_ALIGNED(16, short, best_dqcoeff[16]);
  int dst_stride = x->e_mbd.dst.y_stride;
  unsigned char *dst = x->e_mbd.dst.y_buffer + b->offset;

  unsigned char *Above = dst - dst_stride;
  unsigned char *yleft = dst - 1;
  unsigned char top_left = Above[-1];

  for (mode = B_DC_PRED; mode <= B_HU_PRED; ++mode) {
    int this_rd;
    int ratey;

    rate = bmode_costs[mode];

    vp8_intra4x4_predict(Above, yleft, dst_stride, mode, b->predictor, 16,
                         top_left);
    vp8_subtract_b(be, b, 16);
    x->short_fdct4x4(be->src_diff, be->coeff, 32);
    x->quantize_b(be, b);

    tempa = ta;
    templ = tl;

    ratey = cost_coeffs(x, b, PLANE_TYPE_Y_WITH_DC, &tempa, &templ);
    rate += ratey;
    distortion = vp8_block_error(be->coeff, b->dqcoeff) >> 2;

    this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);

    if (this_rd < best_rd) {
      *bestrate = rate;
      *bestratey = ratey;
      *bestdistortion = distortion;
      best_rd = this_rd;
      *best_mode = mode;
      *a = tempa;
      *l = templ;
      copy_predictor(best_predictor, b->predictor);
      memcpy(best_dqcoeff, b->dqcoeff, 32);
    }
  }
  b->bmi.as_mode = *best_mode;

  vp8_short_idct4x4llm(best_dqcoeff, best_predictor, 16, dst, dst_stride);

  return best_rd;
}

static int rd_pick_intra4x4mby_modes(MACROBLOCK *mb, int *Rate, int *rate_y,
                                     int *Distortion, int best_rd) {
  MACROBLOCKD *const xd = &mb->e_mbd;
  int i;
  int cost = mb->mbmode_cost[xd->frame_type][B_PRED];
  int distortion = 0;
  int tot_rate_y = 0;
  int64_t total_rd = 0;
  ENTROPY_CONTEXT_PLANES t_above, t_left;
  ENTROPY_CONTEXT *ta;
  ENTROPY_CONTEXT *tl;
  const int *bmode_costs;

  t_above = *mb->e_mbd.above_context;
  t_left = *mb->e_mbd.left_context;

  ta = (ENTROPY_CONTEXT *)&t_above;
  tl = (ENTROPY_CONTEXT *)&t_left;

  intra_prediction_down_copy(xd, xd->dst.y_buffer - xd->dst.y_stride + 16);

  bmode_costs = mb->inter_bmode_costs;

  for (i = 0; i < 16; ++i) {
    MODE_INFO *const mic = xd->mode_info_context;
    const int mis = xd->mode_info_stride;
    B_PREDICTION_MODE best_mode = B_MODE_COUNT;
    int r = 0, ry = 0, d = 0;

    if (mb->e_mbd.frame_type == KEY_FRAME) {
      const B_PREDICTION_MODE A = above_block_mode(mic, i, mis);
      const B_PREDICTION_MODE L = left_block_mode(mic, i);

      bmode_costs = mb->bmode_costs[A][L];
    }

    total_rd += rd_pick_intra4x4block(
        mb, mb->block + i, xd->block + i, &best_mode, bmode_costs,
        ta + vp8_block2above[i], tl + vp8_block2left[i], &r, &ry, &d);

    cost += r;
    distortion += d;
    tot_rate_y += ry;

    assert(best_mode != B_MODE_COUNT);
    mic->bmi[i].as_mode = best_mode;

    if (total_rd >= (int64_t)best_rd) break;
  }

  if (total_rd >= (int64_t)best_rd) return INT_MAX;

  *Rate = cost;
  *rate_y = tot_rate_y;
  *Distortion = distortion;

  return RDCOST(mb->rdmult, mb->rddiv, cost, distortion);
}

static int rd_pick_intra16x16mby_mode(MACROBLOCK *x, int *Rate, int *rate_y,
                                      int *Distortion) {
  MB_PREDICTION_MODE mode;
  MB_PREDICTION_MODE mode_selected = MB_MODE_COUNT;
  int rate, ratey;
  int distortion;
  int best_rd = INT_MAX;
  int this_rd;
  MACROBLOCKD *xd = &x->e_mbd;

  /* Y Search for 16x16 intra prediction mode */
  for (mode = DC_PRED; mode <= TM_PRED; ++mode) {
    xd->mode_info_context->mbmi.mode = mode;

    vp8_build_intra_predictors_mby_s(xd, xd->dst.y_buffer - xd->dst.y_stride,
                                     xd->dst.y_buffer - 1, xd->dst.y_stride,
                                     xd->predictor, 16);

    macro_block_yrd(x, &ratey, &distortion);
    rate = ratey +
           x->mbmode_cost[xd->frame_type][xd->mode_info_context->mbmi.mode];

    this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);

    if (this_rd < best_rd) {
      mode_selected = mode;
      best_rd = this_rd;
      *Rate = rate;
      *rate_y = ratey;
      *Distortion = distortion;
    }
  }

  assert(mode_selected != MB_MODE_COUNT);
  xd->mode_info_context->mbmi.mode = mode_selected;
  return best_rd;
}

static int rd_cost_mbuv(MACROBLOCK *mb) {
  int b;
  int cost = 0;
  MACROBLOCKD *x = &mb->e_mbd;
  ENTROPY_CONTEXT_PLANES t_above, t_left;
  ENTROPY_CONTEXT *ta;
  ENTROPY_CONTEXT *tl;

  t_above = *mb->e_mbd.above_context;
  t_left = *mb->e_mbd.left_context;

  ta = (ENTROPY_CONTEXT *)&t_above;
  tl = (ENTROPY_CONTEXT *)&t_left;

  for (b = 16; b < 24; ++b) {
    cost += cost_coeffs(mb, x->block + b, PLANE_TYPE_UV,
                        ta + vp8_block2above[b], tl + vp8_block2left[b]);
  }

  return cost;
}

static int rd_inter16x16_uv(VP8_COMP *cpi, MACROBLOCK *x, int *rate,
                            int *distortion, int fullpixel) {
  (void)cpi;
  (void)fullpixel;

  vp8_build_inter16x16_predictors_mbuv(&x->e_mbd);
  vp8_subtract_mbuv(x->src_diff, x->src.u_buffer, x->src.v_buffer,
                    x->src.uv_stride, &x->e_mbd.predictor[256],
                    &x->e_mbd.predictor[320], 8);

  vp8_transform_mbuv(x);
  vp8_quantize_mbuv(x);

  *rate = rd_cost_mbuv(x);
  *distortion = vp8_mbuverror(x) / 4;

  return RDCOST(x->rdmult, x->rddiv, *rate, *distortion);
}

static int rd_inter4x4_uv(VP8_COMP *cpi, MACROBLOCK *x, int *rate,
                          int *distortion, int fullpixel) {
  (void)cpi;
  (void)fullpixel;

  vp8_build_inter4x4_predictors_mbuv(&x->e_mbd);
  vp8_subtract_mbuv(x->src_diff, x->src.u_buffer, x->src.v_buffer,
                    x->src.uv_stride, &x->e_mbd.predictor[256],
                    &x->e_mbd.predictor[320], 8);

  vp8_transform_mbuv(x);
  vp8_quantize_mbuv(x);

  *rate = rd_cost_mbuv(x);
  *distortion = vp8_mbuverror(x) / 4;

  return RDCOST(x->rdmult, x->rddiv, *rate, *distortion);
}

static void rd_pick_intra_mbuv_mode(MACROBLOCK *x, int *rate,
                                    int *rate_tokenonly, int *distortion) {
  MB_PREDICTION_MODE mode;
  MB_PREDICTION_MODE mode_selected = MB_MODE_COUNT;
  int best_rd = INT_MAX;
  int d = 0, r = 0;
  int rate_to;
  MACROBLOCKD *xd = &x->e_mbd;

  for (mode = DC_PRED; mode <= TM_PRED; ++mode) {
    int this_rate;
    int this_distortion;
    int this_rd;

    xd->mode_info_context->mbmi.uv_mode = mode;

    vp8_build_intra_predictors_mbuv_s(
        xd, xd->dst.u_buffer - xd->dst.uv_stride,
        xd->dst.v_buffer - xd->dst.uv_stride, xd->dst.u_buffer - 1,
        xd->dst.v_buffer - 1, xd->dst.uv_stride, &xd->predictor[256],
        &xd->predictor[320], 8);

    vp8_subtract_mbuv(x->src_diff, x->src.u_buffer, x->src.v_buffer,
                      x->src.uv_stride, &xd->predictor[256],
                      &xd->predictor[320], 8);
    vp8_transform_mbuv(x);
    vp8_quantize_mbuv(x);

    rate_to = rd_cost_mbuv(x);
    this_rate =
        rate_to + x->intra_uv_mode_cost[xd->frame_type]
                                       [xd->mode_info_context->mbmi.uv_mode];

    this_distortion = vp8_mbuverror(x) / 4;

    this_rd = RDCOST(x->rdmult, x->rddiv, this_rate, this_distortion);

    if (this_rd < best_rd) {
      best_rd = this_rd;
      d = this_distortion;
      r = this_rate;
      *rate_tokenonly = rate_to;
      mode_selected = mode;
    }
  }

  *rate = r;
  *distortion = d;

  assert(mode_selected != MB_MODE_COUNT);
  xd->mode_info_context->mbmi.uv_mode = mode_selected;
}

int vp8_cost_mv_ref(MB_PREDICTION_MODE m, const int near_mv_ref_ct[4]) {
  vp8_prob p[VP8_MVREFS - 1];
  assert(NEARESTMV <= m && m <= SPLITMV);
  vp8_mv_ref_probs(p, near_mv_ref_ct);
  return vp8_cost_token(vp8_mv_ref_tree, p,
                        vp8_mv_ref_encoding_array + (m - NEARESTMV));
}

void vp8_set_mbmode_and_mvs(MACROBLOCK *x, MB_PREDICTION_MODE mb, int_mv *mv) {
  x->e_mbd.mode_info_context->mbmi.mode = mb;
  x->e_mbd.mode_info_context->mbmi.mv.as_int = mv->as_int;
}

static int labels2mode(MACROBLOCK *x, int const *labelings, int which_label,
                       B_PREDICTION_MODE this_mode, int_mv *this_mv,
                       int_mv *best_ref_mv, int *mvcost[2]) {
  MACROBLOCKD *const xd = &x->e_mbd;
  MODE_INFO *const mic = xd->mode_info_context;
  const int mis = xd->mode_info_stride;

  int cost = 0;
  int thismvcost = 0;

  /* We have to be careful retrieving previously-encoded motion vectors.
     Ones from this macroblock have to be pulled from the BLOCKD array
     as they have not yet made it to the bmi array in our MB_MODE_INFO. */

  int i = 0;

  do {
    BLOCKD *const d = xd->block + i;
    const int row = i >> 2, col = i & 3;

    B_PREDICTION_MODE m;

    if (labelings[i] != which_label) continue;

    if (col && labelings[i] == labelings[i - 1]) {
      m = LEFT4X4;
    } else if (row && labelings[i] == labelings[i - 4]) {
      m = ABOVE4X4;
    } else {
      /* the only time we should do costing for new motion vector
       * or mode is when we are on a new label  (jbb May 08, 2007)
       */
      switch (m = this_mode) {
        case NEW4X4:
          thismvcost = vp8_mv_bit_cost(this_mv, best_ref_mv, mvcost, 102);
          break;
        case LEFT4X4:
          this_mv->as_int = col ? d[-1].bmi.mv.as_int : left_block_mv(mic, i);
          break;
        case ABOVE4X4:
          this_mv->as_int =
              row ? d[-4].bmi.mv.as_int : above_block_mv(mic, i, mis);
          break;
        case ZERO4X4: this_mv->as_int = 0; break;
        default: break;
      }

      if (m == ABOVE4X4) { /* replace above with left if same */
        int_mv left_mv;

        left_mv.as_int = col ? d[-1].bmi.mv.as_int : left_block_mv(mic, i);

        if (left_mv.as_int == this_mv->as_int) m = LEFT4X4;
      }

      cost = x->inter_bmode_costs[m];
    }

    d->bmi.mv.as_int = this_mv->as_int;

    x->partition_info->bmi[i].mode = m;
    x->partition_info->bmi[i].mv.as_int = this_mv->as_int;

  } while (++i < 16);

  cost += thismvcost;
  return cost;
}

static int rdcost_mbsegment_y(MACROBLOCK *mb, const int *labels,
                              int which_label, ENTROPY_CONTEXT *ta,
                              ENTROPY_CONTEXT *tl) {
  int cost = 0;
  int b;
  MACROBLOCKD *x = &mb->e_mbd;

  for (b = 0; b < 16; ++b) {
    if (labels[b] == which_label) {
      cost += cost_coeffs(mb, x->block + b, PLANE_TYPE_Y_WITH_DC,
                          ta + vp8_block2above[b], tl + vp8_block2left[b]);
    }
  }

  return cost;
}
static unsigned int vp8_encode_inter_mb_segment(MACROBLOCK *x,
                                                int const *labels,
                                                int which_label) {
  int i;
  unsigned int distortion = 0;
  int pre_stride = x->e_mbd.pre.y_stride;
  unsigned char *base_pre = x->e_mbd.pre.y_buffer;

  for (i = 0; i < 16; ++i) {
    if (labels[i] == which_label) {
      BLOCKD *bd = &x->e_mbd.block[i];
      BLOCK *be = &x->block[i];

      vp8_build_inter_predictors_b(bd, 16, base_pre, pre_stride,
                                   x->e_mbd.subpixel_predict);
      vp8_subtract_b(be, bd, 16);
      x->short_fdct4x4(be->src_diff, be->coeff, 32);
      x->quantize_b(be, bd);

      distortion += vp8_block_error(be->coeff, bd->dqcoeff);
    }
  }

  return distortion;
}

static const unsigned int segmentation_to_sseshift[4] = { 3, 3, 2, 0 };

typedef struct {
  int_mv *ref_mv;
  int_mv mvp;

  int segment_rd;
  int segment_num;
  int r;
  int d;
  int segment_yrate;
  B_PREDICTION_MODE modes[16];
  int_mv mvs[16];
  unsigned char eobs[16];

  int mvthresh;
  int *mdcounts;

  int_mv sv_mvp[4]; /* save 4 mvp from 8x8 */
  int sv_istep[2];  /* save 2 initial step_param for 16x8/8x16 */

} BEST_SEG_INFO;

static void rd_check_segment(VP8_COMP *cpi, MACROBLOCK *x, BEST_SEG_INFO *bsi,
                             unsigned int segmentation) {
  int i;
  int const *labels;
  int br = 0;
  int bd = 0;
  B_PREDICTION_MODE this_mode;

  int label_count;
  int this_segment_rd = 0;
  int label_mv_thresh;
  int rate = 0;
  int sbr = 0;
  int sbd = 0;
  int segmentyrate = 0;

  vp8_variance_fn_ptr_t *v_fn_ptr;

  ENTROPY_CONTEXT_PLANES t_above, t_left;
  ENTROPY_CONTEXT_PLANES t_above_b, t_left_b;

  t_above = *x->e_mbd.above_context;
  t_left = *x->e_mbd.left_context;

  vp8_zero(t_above_b);
  vp8_zero(t_left_b);

  br = 0;
  bd = 0;

  v_fn_ptr = &cpi->fn_ptr[segmentation];
  labels = vp8_mbsplits[segmentation];
  label_count = vp8_mbsplit_count[segmentation];

  /* 64 makes this threshold really big effectively making it so that we
   * very rarely check mvs on segments.   setting this to 1 would make mv
   * thresh roughly equal to what it is for macroblocks
   */
  label_mv_thresh = 1 * bsi->mvthresh / label_count;

  /* Segmentation method overheads */
  rate = vp8_cost_token(vp8_mbsplit_tree, vp8_mbsplit_probs,
                        vp8_mbsplit_encodings + segmentation);
  rate += vp8_cost_mv_ref(SPLITMV, bsi->mdcounts);
  this_segment_rd += RDCOST(x->rdmult, x->rddiv, rate, 0);
  br += rate;

  for (i = 0; i < label_count; ++i) {
    int_mv mode_mv[B_MODE_COUNT] = { { 0 }, { 0 } };
    int best_label_rd = INT_MAX;
    B_PREDICTION_MODE mode_selected = ZERO4X4;
    int bestlabelyrate = 0;

    /* search for the best motion vector on this segment */
    for (this_mode = LEFT4X4; this_mode <= NEW4X4; ++this_mode) {
      int this_rd;
      int distortion;
      int labelyrate;
      ENTROPY_CONTEXT_PLANES t_above_s, t_left_s;
      ENTROPY_CONTEXT *ta_s;
      ENTROPY_CONTEXT *tl_s;

      t_above_s = t_above;
      t_left_s = t_left;

      ta_s = (ENTROPY_CONTEXT *)&t_above_s;
      tl_s = (ENTROPY_CONTEXT *)&t_left_s;

      if (this_mode == NEW4X4) {
        int sseshift;
        int num00;
        int step_param = 0;
        int further_steps;
        int n;
        int thissme;
        int bestsme = INT_MAX;
        int_mv temp_mv;
        BLOCK *c;
        BLOCKD *e;

        /* Is the best so far sufficiently good that we can't justify
         * doing a new motion search.
         */
        if (best_label_rd < label_mv_thresh) break;

        if (cpi->compressor_speed) {
          if (segmentation == BLOCK_8X16 || segmentation == BLOCK_16X8) {
            bsi->mvp.as_int = bsi->sv_mvp[i].as_int;
            if (i == 1 && segmentation == BLOCK_16X8) {
              bsi->mvp.as_int = bsi->sv_mvp[2].as_int;
            }

            step_param = bsi->sv_istep[i];
          }

          /* use previous block's result as next block's MV
           * predictor.
           */
          if (segmentation == BLOCK_4X4 && i > 0) {
            bsi->mvp.as_int = x->e_mbd.block[i - 1].bmi.mv.as_int;
            if (i == 4 || i == 8 || i == 12) {
              bsi->mvp.as_int = x->e_mbd.block[i - 4].bmi.mv.as_int;
            }
            step_param = 2;
          }
        }

        further_steps = (MAX_MVSEARCH_STEPS - 1) - step_param;

        {
          int sadpb = x->sadperbit4;
          int_mv mvp_full;

          mvp_full.as_mv.row = bsi->mvp.as_mv.row >> 3;
          mvp_full.as_mv.col = bsi->mvp.as_mv.col >> 3;

          /* find first label */
          n = vp8_mbsplit_offset[segmentation][i];

          c = &x->block[n];
          e = &x->e_mbd.block[n];

          {
            bestsme = cpi->diamond_search_sad(
                x, c, e, &mvp_full, &mode_mv[NEW4X4], step_param, sadpb, &num00,
                v_fn_ptr, x->mvcost, bsi->ref_mv);

            n = num00;
            num00 = 0;

            while (n < further_steps) {
              n++;

              if (num00) {
                num00--;
              } else {
                thissme = cpi->diamond_search_sad(
                    x, c, e, &mvp_full, &temp_mv, step_param + n, sadpb, &num00,
                    v_fn_ptr, x->mvcost, bsi->ref_mv);

                if (thissme < bestsme) {
                  bestsme = thissme;
                  mode_mv[NEW4X4].as_int = temp_mv.as_int;
                }
              }
            }
          }

          sseshift = segmentation_to_sseshift[segmentation];

          /* Should we do a full search (best quality only) */
          if ((cpi->compressor_speed == 0) && (bestsme >> sseshift) > 4000) {
            /* Check if mvp_full is within the range. */
            vp8_clamp_mv(&mvp_full, x->mv_col_min, x->mv_col_max, x->mv_row_min,
                         x->mv_row_max);

            thissme = vp8_full_search_sad(x, c, e, &mvp_full, sadpb, 16,
                                          v_fn_ptr, x->mvcost, bsi->ref_mv);

            if (thissme < bestsme) {
              bestsme = thissme;
              mode_mv[NEW4X4].as_int = e->bmi.mv.as_int;
            } else {
              /* The full search result is actually worse so
               * re-instate the previous best vector
               */
              e->bmi.mv.as_int = mode_mv[NEW4X4].as_int;
            }
          }
        }

        if (bestsme < INT_MAX) {
          int disto;
          unsigned int sse;
          cpi->find_fractional_mv_step(x, c, e, &mode_mv[NEW4X4], bsi->ref_mv,
                                       x->errorperbit, v_fn_ptr, x->mvcost,
                                       &disto, &sse);
        }
      } /* NEW4X4 */

      rate = labels2mode(x, labels, i, this_mode, &mode_mv[this_mode],
                         bsi->ref_mv, x->mvcost);

      /* Trap vectors that reach beyond the UMV borders */
      if (((mode_mv[this_mode].as_mv.row >> 3) < x->mv_row_min) ||
          ((mode_mv[this_mode].as_mv.row >> 3) > x->mv_row_max) ||
          ((mode_mv[this_mode].as_mv.col >> 3) < x->mv_col_min) ||
          ((mode_mv[this_mode].as_mv.col >> 3) > x->mv_col_max)) {
        continue;
      }

      distortion = vp8_encode_inter_mb_segment(x, labels, i) / 4;

      labelyrate = rdcost_mbsegment_y(x, labels, i, ta_s, tl_s);
      rate += labelyrate;

      this_rd = RDCOST(x->rdmult, x->rddiv, rate, distortion);

      if (this_rd < best_label_rd) {
        sbr = rate;
        sbd = distortion;
        bestlabelyrate = labelyrate;
        mode_selected = this_mode;
        best_label_rd = this_rd;

        t_above_b = t_above_s;
        t_left_b = t_left_s;
      }
    } /*for each 4x4 mode*/

    t_above = t_above_b;
    t_left = t_left_b;

    labels2mode(x, labels, i, mode_selected, &mode_mv[mode_selected],
                bsi->ref_mv, x->mvcost);

    br += sbr;
    bd += sbd;
    segmentyrate += bestlabelyrate;
    this_segment_rd += best_label_rd;

    if (this_segment_rd >= bsi->segment_rd) break;

  } /* for each label */

  if (this_segment_rd < bsi->segment_rd) {
    bsi->r = br;
    bsi->d = bd;
    bsi->segment_yrate = segmentyrate;
    bsi->segment_rd = this_segment_rd;
    bsi->segment_num = segmentation;

    /* store everything needed to come back to this!! */
    for (i = 0; i < 16; ++i) {
      bsi->mvs[i].as_mv = x->partition_info->bmi[i].mv.as_mv;
      bsi->modes[i] = x->partition_info->bmi[i].mode;
      bsi->eobs[i] = x->e_mbd.eobs[i];
    }
  }
}

static void vp8_cal_step_param(int sr, int *sp) {
  int step = 0;

  if (sr > MAX_FIRST_STEP) {
    sr = MAX_FIRST_STEP;
  } else if (sr < 1) {
    sr = 1;
  }

  while (sr >>= 1) step++;

  *sp = MAX_MVSEARCH_STEPS - 1 - step;
}

static int vp8_rd_pick_best_mbsegmentation(VP8_COMP *cpi, MACROBLOCK *x,
                                           int_mv *best_ref_mv, int best_rd,
                                           int *mdcounts, int *returntotrate,
                                           int *returnyrate,
                                           int *returndistortion,
                                           int mvthresh) {
  int i;
  BEST_SEG_INFO bsi;

  memset(&bsi, 0, sizeof(bsi));

  bsi.segment_rd = best_rd;
  bsi.ref_mv = best_ref_mv;
  bsi.mvp.as_int = best_ref_mv->as_int;
  bsi.mvthresh = mvthresh;
  bsi.mdcounts = mdcounts;

  for (i = 0; i < 16; ++i) {
    bsi.modes[i] = ZERO4X4;
  }

  if (cpi->compressor_speed == 0) {
    /* for now, we will keep the original segmentation order
       when in best quality mode */
    rd_check_segment(cpi, x, &bsi, BLOCK_16X8);
    rd_check_segment(cpi, x, &bsi, BLOCK_8X16);
    rd_check_segment(cpi, x, &bsi, BLOCK_8X8);
    rd_check_segment(cpi, x, &bsi, BLOCK_4X4);
  } else {
    int sr;

    rd_check_segment(cpi, x, &bsi, BLOCK_8X8);

    if (bsi.segment_rd < best_rd) {
      int col_min = ((best_ref_mv->as_mv.col + 7) >> 3) - MAX_FULL_PEL_VAL;
      int row_min = ((best_ref_mv->as_mv.row + 7) >> 3) - MAX_FULL_PEL_VAL;
      int col_max = (best_ref_mv->as_mv.col >> 3) + MAX_FULL_PEL_VAL;
      int row_max = (best_ref_mv->as_mv.row >> 3) + MAX_FULL_PEL_VAL;

      int tmp_col_min = x->mv_col_min;
      int tmp_col_max = x->mv_col_max;
      int tmp_row_min = x->mv_row_min;
      int tmp_row_max = x->mv_row_max;

      /* 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;

      /* Get 8x8 result */
      bsi.sv_mvp[0].as_int = bsi.mvs[0].as_int;
      bsi.sv_mvp[1].as_int = bsi.mvs[2].as_int;
      bsi.sv_mvp[2].as_int = bsi.mvs[8].as_int;
      bsi.sv_mvp[3].as_int = bsi.mvs[10].as_int;

      /* Use 8x8 result as 16x8/8x16's predictor MV. Adjust search range
       * according to the closeness of 2 MV. */
      /* block 8X16 */
      {
        sr =
            MAXF((abs(bsi.sv_mvp[0].as_mv.row - bsi.sv_mvp[2].as_mv.row)) >> 3,
                 (abs(bsi.sv_mvp[0].as_mv.col - bsi.sv_mvp[2].as_mv.col)) >> 3);
        vp8_cal_step_param(sr, &bsi.sv_istep[0]);

        sr =
            MAXF((abs(bsi.sv_mvp[1].as_mv.row - bsi.sv_mvp[3].as_mv.row)) >> 3,
                 (abs(bsi.sv_mvp[1].as_mv.col - bsi.sv_mvp[3].as_mv.col)) >> 3);
        vp8_cal_step_param(sr, &bsi.sv_istep[1]);

        rd_check_segment(cpi, x, &bsi, BLOCK_8X16);
      }

      /* block 16X8 */
      {
        sr =
            MAXF((abs(bsi.sv_mvp[0].as_mv.row - bsi.sv_mvp[1].as_mv.row)) >> 3,
                 (abs(bsi.sv_mvp[0].as_mv.col - bsi.sv_mvp[1].as_mv.col)) >> 3);
        vp8_cal_step_param(sr, &bsi.sv_istep[0]);

        sr =
            MAXF((abs(bsi.sv_mvp[2].as_mv.row - bsi.sv_mvp[3].as_mv.row)) >> 3,
                 (abs(bsi.sv_mvp[2].as_mv.col - bsi.sv_mvp[3].as_mv.col)) >> 3);
        vp8_cal_step_param(sr, &bsi.sv_istep[1]);

        rd_check_segment(cpi, x, &bsi, BLOCK_16X8);
      }

      /* If 8x8 is better than 16x8/8x16, then do 4x4 search */
      /* Not skip 4x4 if speed=0 (good quality) */
      if (cpi->sf.no_skip_block4x4_search || bsi.segment_num == BLOCK_8X8)
      /* || (sv_segment_rd8x8-bsi.segment_rd) < sv_segment_rd8x8>>5) */
      {
        bsi.mvp.as_int = bsi.sv_mvp[0].as_int;
        rd_check_segment(cpi, x, &bsi, BLOCK_4X4);
      }

      /* restore UMV window */
      x->mv_col_min = tmp_col_min;
      x->mv_col_max = tmp_col_max;
      x->mv_row_min = tmp_row_min;
      x->mv_row_max = tmp_row_max;
    }
  }

  /* set it to the best */
  for (i = 0; i < 16; ++i) {
    BLOCKD *bd = &x->e_mbd.block[i];

    bd->bmi.mv.as_int = bsi.mvs[i].as_int;
    *bd->eob = bsi.eobs[i];
  }

  *returntotrate = bsi.r;
  *returndistortion = bsi.d;
  *returnyrate = bsi.segment_yrate;

  /* save partitions */
  x->e_mbd.mode_info_context->mbmi.partitioning = bsi.segment_num;
  x->partition_info->count = vp8_mbsplit_count[bsi.segment_num];

  for (i = 0; i < x->partition_info->count; ++i) {
    int j;

    j = vp8_mbsplit_offset[bsi.segment_num][i];

    x->partition_info->bmi[i].mode = bsi.modes[j];
    x->partition_info->bmi[i].mv.as_mv = bsi.mvs[j].as_mv;
  }
  /*
   * used to set x->e_mbd.mode_info_context->mbmi.mv.as_int
   */
  x->partition_info->bmi[15].mv.as_int = bsi.mvs[15].as_int;

  return bsi.segment_rd;
}

/* The improved MV prediction */
void vp8_mv_pred(VP8_COMP *cpi, MACROBLOCKD *xd, const MODE_INFO *here,
                 int_mv *mvp, int refframe, int *ref_frame_sign_bias, int *sr,
                 int near_sadidx[]) {
  const MODE_INFO *above = here - xd->mode_info_stride;
  const MODE_INFO *left = here - 1;
  const MODE_INFO *aboveleft = above - 1;
  int_mv near_mvs[8];
  int near_ref[8];
  int_mv mv;
  int vcnt = 0;
  int find = 0;
  int mb_offset;

  int mvx[8];
  int mvy[8];
  int i;

  mv.as_int = 0;

  if (here->mbmi.ref_frame != INTRA_FRAME) {
    near_mvs[0].as_int = near_mvs[1].as_int = near_mvs[2].as_int =
        near_mvs[3].as_int = near_mvs[4].as_int = near_mvs[5].as_int =
            near_mvs[6].as_int = near_mvs[7].as_int = 0;
    near_ref[0] = near_ref[1] = near_ref[2] = near_ref[3] = near_ref[4] =
        near_ref[5] = near_ref[6] = near_ref[7] = 0;

    /* read in 3 nearby block's MVs from current frame as prediction
     * candidates.
     */
    if (above->mbmi.ref_frame != INTRA_FRAME) {
      near_mvs[vcnt].as_int = above->mbmi.mv.as_int;
      mv_bias(ref_frame_sign_bias[above->mbmi.ref_frame], refframe,
              &near_mvs[vcnt], ref_frame_sign_bias);
      near_ref[vcnt] = above->mbmi.ref_frame;
    }
    vcnt++;
    if (left->mbmi.ref_frame != INTRA_FRAME) {
      near_mvs[vcnt].as_int = left->mbmi.mv.as_int;
      mv_bias(ref_frame_sign_bias[left->mbmi.ref_frame], refframe,
              &near_mvs[vcnt], ref_frame_sign_bias);
      near_ref[vcnt] = left->mbmi.ref_frame;
    }
    vcnt++;
    if (aboveleft->mbmi.ref_frame != INTRA_FRAME) {
      near_mvs[vcnt].as_int = aboveleft->mbmi.mv.as_int;
      mv_bias(ref_frame_sign_bias[aboveleft->mbmi.ref_frame], refframe,
              &near_mvs[vcnt], ref_frame_sign_bias);
      near_ref[vcnt] = aboveleft->mbmi.ref_frame;
    }
    vcnt++;

    /* read in 5 nearby block's MVs from last frame. */
    if (cpi->common.last_frame_type != KEY_FRAME) {
      mb_offset = (-xd->mb_to_top_edge / 128 + 1) * (xd->mode_info_stride + 1) +
                  (-xd->mb_to_left_edge / 128 + 1);

      /* current in last frame */
      if (cpi->lf_ref_frame[mb_offset] != INTRA_FRAME) {
        near_mvs[vcnt].as_int = cpi->lfmv[mb_offset].as_int;
        mv_bias(cpi->lf_ref_frame_sign_bias[mb_offset], refframe,
                &near_mvs[vcnt], ref_frame_sign_bias);
        near_ref[vcnt] = cpi->lf_ref_frame[mb_offset];
      }
      vcnt++;

      /* above in last frame */
      if (cpi->lf_ref_frame[mb_offset - xd->mode_info_stride - 1] !=
          INTRA_FRAME) {
        near_mvs[vcnt].as_int =
            cpi->lfmv[mb_offset - xd->mode_info_stride - 1].as_int;
        mv_bias(
            cpi->lf_ref_frame_sign_bias[mb_offset - xd->mode_info_stride - 1],
            refframe, &near_mvs[vcnt], ref_frame_sign_bias);
        near_ref[vcnt] =
            cpi->lf_ref_frame[mb_offset - xd->mode_info_stride - 1];
      }
      vcnt++;

      /* left in last frame */
      if (cpi->lf_ref_frame[mb_offset - 1] != INTRA_FRAME) {
        near_mvs[vcnt].as_int = cpi->lfmv[mb_offset - 1].as_int;
        mv_bias(cpi->lf_ref_frame_sign_bias[mb_offset - 1], refframe,
                &near_mvs[vcnt], ref_frame_sign_bias);
        near_ref[vcnt] = cpi->lf_ref_frame[mb_offset - 1];
      }
      vcnt++;

      /* right in last frame */
      if (cpi->lf_ref_frame[mb_offset + 1] != INTRA_FRAME) {
        near_mvs[vcnt].as_int = cpi->lfmv[mb_offset + 1].as_int;
        mv_bias(cpi->lf_ref_frame_sign_bias[mb_offset + 1], refframe,
                &near_mvs[vcnt], ref_frame_sign_bias);
        near_ref[vcnt] = cpi->lf_ref_frame[mb_offset + 1];
      }
      vcnt++;

      /* below in last frame */
      if (cpi->lf_ref_frame[mb_offset + xd->mode_info_stride + 1] !=
          INTRA_FRAME) {
        near_mvs[vcnt].as_int =
            cpi->lfmv[mb_offset + xd->mode_info_stride + 1].as_int;
        mv_bias(
            cpi->lf_ref_frame_sign_bias[mb_offset + xd->mode_info_stride + 1],
            refframe, &near_mvs[vcnt], ref_frame_sign_bias);
        near_ref[vcnt] =
            cpi->lf_ref_frame[mb_offset + xd->mode_info_stride + 1];
      }
      vcnt++;
    }

    for (i = 0; i < vcnt; ++i) {
      if (near_ref[near_sadidx[i]] != INTRA_FRAME) {
        if (here->mbmi.ref_frame == near_ref[near_sadidx[i]]) {
          mv.as_int = near_mvs[near_sadidx[i]].as_int;
          find = 1;
          if (i < 3) {
            *sr = 3;
          } else {
            *sr = 2;
          }
          break;
        }
      }
    }

    if (!find) {
      for (i = 0; i < vcnt; ++i) {
        mvx[i] = near_mvs[i].as_mv.row;
        mvy[i] = near_mvs[i].as_mv.col;
      }

      insertsortmv(mvx, vcnt);
      insertsortmv(mvy, vcnt);
      mv.as_mv.row = mvx[vcnt / 2];
      mv.as_mv.col = mvy[vcnt / 2];

      /* sr is set to 0 to allow calling function to decide the search
       * range.
       */
      *sr = 0;
    }
  }

  /* Set up return values */
  mvp->as_int = mv.as_int;
  vp8_clamp_mv2(mvp, xd);
}

void vp8_cal_sad(VP8_COMP *cpi, MACROBLOCKD *xd, MACROBLOCK *x,
                 int recon_yoffset, int near_sadidx[]) {
  /* near_sad indexes:
   *   0-cf above, 1-cf left, 2-cf aboveleft,
   *   3-lf current, 4-lf above, 5-lf left, 6-lf right, 7-lf below
   */
  int near_sad[8] = { 0 };
  BLOCK *b = &x->block[0];
  unsigned char *src_y_ptr = *(b->base_src);

  /* calculate sad for current frame 3 nearby MBs. */
  if (xd->mb_to_top_edge == 0 && xd->mb_to_left_edge == 0) {
    near_sad[0] = near_sad[1] = near_sad[2] = INT_MAX;
  } else if (xd->mb_to_top_edge ==
             0) { /* only has left MB for sad calculation. */
    near_sad[0] = near_sad[2] = INT_MAX;
    near_sad[1] = cpi->fn_ptr[BLOCK_16X16].sdf(
        src_y_ptr, b->src_stride, xd->dst.y_buffer - 16, xd->dst.y_stride);
  } else if (xd->mb_to_left_edge ==
             0) { /* only has left MB for sad calculation. */
    near_sad[1] = near_sad[2] = INT_MAX;
    near_sad[0] = cpi->fn_ptr[BLOCK_16X16].sdf(
        src_y_ptr, b->src_stride, xd->dst.y_buffer - xd->dst.y_stride * 16,
        xd->dst.y_stride);
  } else {
    near_sad[0] = cpi->fn_ptr[BLOCK_16X16].sdf(
        src_y_ptr, b->src_stride, xd->dst.y_buffer - xd->dst.y_stride * 16,
        xd->dst.y_stride);
    near_sad[1] = cpi->fn_ptr[BLOCK_16X16].sdf(
        src_y_ptr, b->src_stride, xd->dst.y_buffer - 16, xd->dst.y_stride);
    near_sad[2] = cpi->fn_ptr[BLOCK_16X16].sdf(
        src_y_ptr, b->src_stride, xd->dst.y_buffer - xd->dst.y_stride * 16 - 16,
        xd->dst.y_stride);
  }

  if (cpi->common.last_frame_type != KEY_FRAME) {
    /* calculate sad for last frame 5 nearby MBs. */
    unsigned char *pre_y_buffer =
        cpi->common.yv12_fb[cpi->common.lst_fb_idx].y_buffer + recon_yoffset;
    int pre_y_stride = cpi->common.yv12_fb[cpi->common.lst_fb_idx].y_stride;

    if (xd->mb_to_top_edge == 0) near_sad[4] = INT_MAX;
    if (xd->mb_to_left_edge == 0) near_sad[5] = INT_MAX;
    if (xd->mb_to_right_edge == 0) near_sad[6] = INT_MAX;
    if (xd->mb_to_bottom_edge == 0) near_sad[7] = INT_MAX;

    if (near_sad[4] != INT_MAX) {
      near_sad[4] = cpi->fn_ptr[BLOCK_16X16].sdf(
          src_y_ptr, b->src_stride, pre_y_buffer - pre_y_stride * 16,
          pre_y_stride);
    }
    if (near_sad[5] != INT_MAX) {
      near_sad[5] = cpi->fn_ptr[BLOCK_16X16].sdf(
          src_y_ptr, b->src_stride, pre_y_buffer - 16, pre_y_stride);
    }
    near_sad[3] = cpi->fn_ptr[BLOCK_16X16].sdf(src_y_ptr, b->src_stride,
                                               pre_y_buffer, pre_y_stride);
    if (near_sad[6] != INT_MAX) {
      near_sad[6] = cpi->fn_ptr[BLOCK_16X16].sdf(
          src_y_ptr, b->src_stride, pre_y_buffer + 16, pre_y_stride);
    }
    if (near_sad[7] != INT_MAX) {
      near_sad[7] = cpi->fn_ptr[BLOCK_16X16].sdf(
          src_y_ptr, b->src_stride, pre_y_buffer + pre_y_stride * 16,
          pre_y_stride);
    }
  }

  if (cpi->common.last_frame_type != KEY_FRAME) {
    insertsortsad(near_sad, near_sadidx, 8);
  } else {
    insertsortsad(near_sad, near_sadidx, 3);
  }
}

static void rd_update_mvcount(MACROBLOCK *x, int_mv *best_ref_mv) {
  if (x->e_mbd.mode_info_context->mbmi.mode == SPLITMV) {
    int i;

    for (i = 0; i < x->partition_info->count; ++i) {
      if (x->partition_info->bmi[i].mode == NEW4X4) {
        const int row_val = ((x->partition_info->bmi[i].mv.as_mv.row -
                              best_ref_mv->as_mv.row) >>
                             1);
        const int row_idx = mv_max + row_val;
        const int col_val = ((x->partition_info->bmi[i].mv.as_mv.col -
                              best_ref_mv->as_mv.col) >>
                             1);
        const int col_idx = mv_max + col_val;
        if (row_idx >= 0 && row_idx < MVvals && col_idx >= 0 &&
            col_idx < MVvals) {
          x->MVcount[0][row_idx]++;
          x->MVcount[1][col_idx]++;
        }
      }
    }
  } else if (x->e_mbd.mode_info_context->mbmi.mode == NEWMV) {
    const int row_val = ((x->e_mbd.mode_info_context->mbmi.mv.as_mv.row -
                          best_ref_mv->as_mv.row) >>
                         1);
    const int row_idx = mv_max + row_val;
    const int col_val = ((x->e_mbd.mode_info_context->mbmi.mv.as_mv.col -
                          best_ref_mv->as_mv.col) >>
                         1);
    const int col_idx = mv_max + col_val;
    if (row_idx >= 0 && row_idx < MVvals && col_idx >= 0 && col_idx < MVvals) {
      x->MVcount[0][row_idx]++;
      x->MVcount[1][col_idx]++;
    }
  }
}

static int evaluate_inter_mode_rd(int mdcounts[4], RATE_DISTORTION *rd,
                                  int *disable_skip, VP8_COMP *cpi,
                                  MACROBLOCK *x) {
  MB_PREDICTION_MODE this_mode = x->e_mbd.mode_info_context->mbmi.mode;
  BLOCK *b = &x->block[0];
  MACROBLOCKD *xd = &x->e_mbd;
  int distortion;
  vp8_build_inter16x16_predictors_mby(&x->e_mbd, x->e_mbd.predictor, 16);

  if (cpi->active_map_enabled && x->active_ptr[0] == 0) {
    x->skip = 1;
  } else if (x->encode_breakout) {
    unsigned int sse;
    unsigned int var;
    unsigned int threshold =
        (xd->block[0].dequant[1] * xd->block[0].dequant[1] >> 4);

    if (threshold < x->encode_breakout) threshold = x->encode_breakout;

    var = vpx_variance16x16(*(b->base_src), b->src_stride, x->e_mbd.predictor,
                            16, &sse);

    if (sse < threshold) {
      unsigned int q2dc = xd->block[24].dequant[0];
      /* If theres is no codeable 2nd order dc
         or a very small uniform pixel change change */
      if ((sse - var < q2dc * q2dc >> 4) || (sse / 2 > var && sse - var < 64)) {
        /* Check u and v to make sure skip is ok */
        unsigned int sse2 = VP8_UVSSE(x);
        if (sse2 * 2 < threshold) {
          x->skip = 1;
          rd->distortion2 = sse + sse2;
          rd->rate2 = 500;

          /* for best_yrd calculation */
          rd->rate_uv = 0;
          rd->distortion_uv = sse2;

          *disable_skip = 1;
          return RDCOST(x->rdmult, x->rddiv, rd->rate2, rd->distortion2);
        }
      }
    }
  }

  /* Add in the Mv/mode cost */
  rd->rate2 += vp8_cost_mv_ref(this_mode, mdcounts);

  /* Y cost and distortion */
  macro_block_yrd(x, &rd->rate_y, &distortion);
  rd->rate2 += rd->rate_y;
  rd->distortion2 += distortion;

  /* UV cost and distortion */
  rd_inter16x16_uv(cpi, x, &rd->rate_uv, &rd->distortion_uv,
                   cpi->common.full_pixel);
  rd->rate2 += rd->rate_uv;
  rd->distortion2 += rd->distortion_uv;
  return INT_MAX;
}

static int calculate_final_rd_costs(int this_rd, RATE_DISTORTION *rd,
                                    int *other_cost, int disable_skip,
                                    int uv_intra_tteob, int intra_rd_penalty,
                                    VP8_COMP *cpi, MACROBLOCK *x) {
  MB_PREDICTION_MODE this_mode = x->e_mbd.mode_info_context->mbmi.mode;

  /* Where skip is allowable add in the default per mb cost for the no
   * skip case. where we then decide to skip we have to delete this and
   * replace it with the cost of signalling a skip
   */
  if (cpi->common.mb_no_coeff_skip) {
    *other_cost += vp8_cost_bit(cpi->prob_skip_false, 0);
    rd->rate2 += *other_cost;
  }

  /* Estimate the reference frame signaling cost and add it
   * to the rolling cost variable.
   */
  rd->rate2 += x->ref_frame_cost[x->e_mbd.mode_info_context->mbmi.ref_frame];

  if (!disable_skip) {
    /* Test for the condition where skip block will be activated
     * because there are no non zero coefficients and make any
     * necessary adjustment for rate
     */
    if (cpi->common.mb_no_coeff_skip) {
      int i;
      int tteob;
      int has_y2_block = (this_mode != SPLITMV && this_mode != B_PRED);

      tteob = 0;
      if (has_y2_block) tteob += x->e_mbd.eobs[24];

      for (i = 0; i < 16; ++i) tteob += (x->e_mbd.eobs[i] > has_y2_block);

      if (x->e_mbd.mode_info_context->mbmi.ref_frame) {
        for (i = 16; i < 24; ++i) tteob += x->e_mbd.eobs[i];
      } else {
        tteob += uv_intra_tteob;
      }

      if (tteob == 0) {
        rd->rate2 -= (rd->rate_y + rd->rate_uv);
        /* for best_yrd calculation */
        rd->rate_uv = 0;

        /* Back out no skip flag costing and add in skip flag costing */
        if (cpi->prob_skip_false) {
          int prob_skip_cost;

          prob_skip_cost = vp8_cost_bit(cpi->prob_skip_false, 1);
          prob_skip_cost -= (int)vp8_cost_bit(cpi->prob_skip_false, 0);
          rd->rate2 += prob_skip_cost;
          *other_cost += prob_skip_cost;
        }
      }
    }
    /* Calculate the final RD estimate for this mode */
    this_rd = RDCOST(x->rdmult, x->rddiv, rd->rate2, rd->distortion2);
    if (this_rd < INT_MAX &&
        x->e_mbd.mode_info_context->mbmi.ref_frame == INTRA_FRAME) {
      this_rd += intra_rd_penalty;
    }
  }
  return this_rd;
}

static void update_best_mode(BEST_MODE *best_mode, int this_rd,
                             RATE_DISTORTION *rd, int other_cost,
                             MACROBLOCK *x) {
  MB_PREDICTION_MODE this_mode = x->e_mbd.mode_info_context->mbmi.mode;

  other_cost += x->ref_frame_cost[x->e_mbd.mode_info_context->mbmi.ref_frame];

  /* Calculate the final y RD estimate for this mode */
  best_mode->yrd =
      RDCOST(x->rdmult, x->rddiv, (rd->rate2 - rd->rate_uv - other_cost),
             (rd->distortion2 - rd->distortion_uv));

  best_mode->rd = this_rd;
  best_mode->mbmode = x->e_mbd.mode_info_context->mbmi;
  best_mode->partition = *x->partition_info;

  if ((this_mode == B_PRED) || (this_mode == SPLITMV)) {
    int i;
    for (i = 0; i < 16; ++i) {
      best_mode->bmodes[i] = x->e_mbd.block[i].bmi;
    }
  }
}

void vp8_rd_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset,
                            int recon_uvoffset, int *returnrate,
                            int *returndistortion, int *returnintra, int mb_row,
                            int mb_col) {
  BLOCK *b = &x->block[0];
  BLOCKD *d = &x->e_mbd.block[0];
  MACROBLOCKD *xd = &x->e_mbd;
  int_mv best_ref_mv_sb[2];
  int_mv mode_mv_sb[2][MB_MODE_COUNT];
  int_mv best_ref_mv;
  int_mv *mode_mv;
  MB_PREDICTION_MODE this_mode;
  int num00;
  int best_mode_index = 0;
  BEST_MODE best_mode;

  int i;
  int mode_index;
  int mdcounts[4];
  int rate;
  RATE_DISTORTION rd;
  int uv_intra_rate, uv_intra_distortion, uv_intra_rate_tokenonly;
  int uv_intra_tteob = 0;
  int uv_intra_done = 0;

  MB_PREDICTION_MODE uv_intra_mode = 0;
  int_mv mvp;
  int near_sadidx[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
  int saddone = 0;
  /* search range got from mv_pred(). It uses step_param levels. (0-7) */
  int sr = 0;

  unsigned char *plane[4][3] = { { 0, 0 } };
  int ref_frame_map[4];
  int sign_bias = 0;

  int intra_rd_penalty =
      10 * vp8_dc_quant(cpi->common.base_qindex, cpi->common.y1dc_delta_q);

#if CONFIG_TEMPORAL_DENOISING
  unsigned int zero_mv_sse = UINT_MAX, best_sse = UINT_MAX,
               best_rd_sse = UINT_MAX;
#endif

  // _uv variables are not set consistantly before calling update_best_mode.
  rd.rate_uv = 0;
  rd.distortion_uv = 0;

  mode_mv = mode_mv_sb[sign_bias];
  best_ref_mv.as_int = 0;
  best_mode.rd = INT_MAX;
  best_mode.yrd = INT_MAX;
  best_mode.intra_rd = INT_MAX;
  memset(mode_mv_sb, 0, sizeof(mode_mv_sb));
  memset(&best_mode.mbmode, 0, sizeof(best_mode.mbmode));
  memset(&best_mode.bmodes, 0, sizeof(best_mode.bmodes));

  /* Setup search priorities */
  get_reference_search_order(cpi, ref_frame_map);

  /* Check to see if there is at least 1 valid reference frame that we need
   * to calculate near_mvs.
   */
  if (ref_frame_map[1] > 0) {
    sign_bias = vp8_find_near_mvs_bias(
        &x->e_mbd, x->e_mbd.mode_info_context, mode_mv_sb, best_ref_mv_sb,
        mdcounts, ref_frame_map[1], cpi->common.ref_frame_sign_bias);

    mode_mv = mode_mv_sb[sign_bias];
    best_ref_mv.as_int = best_ref_mv_sb[sign_bias].as_int;
  }

  get_predictor_pointers(cpi, plane, recon_yoffset, recon_uvoffset);

  *returnintra = INT_MAX;
  /* Count of the number of MBs tested so far this frame */
  x->mbs_tested_so_far++;

  x->skip = 0;

  for (mode_index = 0; mode_index < MAX_MODES; ++mode_index) {
    int this_rd = INT_MAX;
    int disable_skip = 0;
    int other_cost = 0;
    int this_ref_frame = ref_frame_map[vp8_ref_frame_order[mode_index]];

    /* Test best rd so far against threshold for trying this mode. */
    if (best_mode.rd <= x->rd_threshes[mode_index]) continue;

    if (this_ref_frame < 0) continue;

    /* These variables hold are rolling total cost and distortion for
     * this mode
     */
    rd.rate2 = 0;
    rd.distortion2 = 0;

    this_mode = vp8_mode_order[mode_index];

    x->e_mbd.mode_info_context->mbmi.mode = this_mode;
    x->e_mbd.mode_info_context->mbmi.ref_frame = this_ref_frame;

    /* Only consider ZEROMV/ALTREF_FRAME for alt ref frame,
     * unless ARNR filtering is enabled in which case we want
     * an unfiltered alternative
     */
    if (cpi->is_src_frame_alt_ref && (cpi->oxcf.arnr_max_frames == 0)) {
      if (this_mode != ZEROMV ||
          x->e_mbd.mode_info_context->mbmi.ref_frame != ALTREF_FRAME) {
        continue;
      }
    }

    /* everything but intra */
    if (x->e_mbd.mode_info_context->mbmi.ref_frame) {
      assert(plane[this_ref_frame][0] != NULL &&
             plane[this_ref_frame][1] != NULL &&
             plane[this_ref_frame][2] != NULL);
      x->e_mbd.pre.y_buffer = plane[this_ref_frame][0];
      x->e_mbd.pre.u_buffer = plane[this_ref_frame][1];
      x->e_mbd.pre.v_buffer = plane[this_ref_frame][2];

      if (sign_bias != cpi->common.ref_frame_sign_bias[this_ref_frame]) {
        sign_bias = cpi->common.ref_frame_sign_bias[this_ref_frame];
        mode_mv = mode_mv_sb[sign_bias];
        best_ref_mv.as_int = best_ref_mv_sb[sign_bias].as_int;
      }
    }

    /* Check to see if the testing frequency for this mode is at its
     * max If so then prevent it from being tested and increase the
     * threshold for its testing
     */
    if (x->mode_test_hit_counts[mode_index] &&
        (cpi->mode_check_freq[mode_index] > 1)) {
      if (x->mbs_tested_so_far <= cpi->mode_check_freq[mode_index] *
                                      x->mode_test_hit_counts[mode_index]) {
        /* Increase the threshold for coding this mode to make it
         * less likely to be chosen
         */
        x->rd_thresh_mult[mode_index] += 4;

        if (x->rd_thresh_mult[mode_index] > MAX_THRESHMULT) {
          x->rd_thresh_mult[mode_index] = MAX_THRESHMULT;
        }

        x->rd_threshes[mode_index] =
            (cpi->rd_baseline_thresh[mode_index] >> 7) *
            x->rd_thresh_mult[mode_index];

        continue;
      }
    }

    /* We have now reached the point where we are going to test the
     * current mode so increment the counter for the number of times
     * it has been tested
     */
    x->mode_test_hit_counts[mode_index]++;

    /* Experimental code. Special case for gf and arf zeromv modes.
     * Increase zbin size to supress noise
     */
    if (x->zbin_mode_boost_enabled) {
      if (this_ref_frame == INTRA_FRAME) {
        x->zbin_mode_boost = 0;
      } else {
        if (vp8_mode_order[mode_index] == ZEROMV) {
          if (this_ref_frame != LAST_FRAME) {
            x->zbin_mode_boost = GF_ZEROMV_ZBIN_BOOST;
          } else {
            x->zbin_mode_boost = LF_ZEROMV_ZBIN_BOOST;
          }
        } else if (vp8_mode_order[mode_index] == SPLITMV) {
          x->zbin_mode_boost = 0;
        } else {
          x->zbin_mode_boost = MV_ZBIN_BOOST;
        }
      }

      vp8_update_zbin_extra(cpi, x);
    }

    if (!uv_intra_done && this_ref_frame == INTRA_FRAME) {
      rd_pick_intra_mbuv_mode(x, &uv_intra_rate, &uv_intra_rate_tokenonly,
                              &uv_intra_distortion);
      uv_intra_mode = x->e_mbd.mode_info_context->mbmi.uv_mode;

      /*
       * Total of the eobs is used later to further adjust rate2. Since uv
       * block's intra eobs will be overwritten when we check inter modes,
       * we need to save uv_intra_tteob here.
       */
      for (i = 16; i < 24; ++i) uv_intra_tteob += x->e_mbd.eobs[i];

      uv_intra_done = 1;
    }

    switch (this_mode) {
      case B_PRED: {
        int tmp_rd;

        /* Note the rate value returned here includes the cost of
         * coding the BPRED mode: x->mbmode_cost[x->e_mbd.frame_type][BPRED]
         */
        int distortion;
        tmp_rd = rd_pick_intra4x4mby_modes(x, &rate, &rd.rate_y, &distortion,
                                           best_mode.yrd);
        rd.rate2 += rate;
        rd.distortion2 += distortion;

        if (tmp_rd < best_mode.yrd) {
          assert(uv_intra_done);
          rd.rate2 += uv_intra_rate;
          rd.rate_uv = uv_intra_rate_tokenonly;
          rd.distortion2 += uv_intra_distortion;
          rd.distortion_uv = uv_intra_distortion;
        } else {
          this_rd = INT_MAX;
          disable_skip = 1;
        }
        break;
      }

      case SPLITMV: {
        int tmp_rd;
        int this_rd_thresh;
        int distortion;

        this_rd_thresh = (vp8_ref_frame_order[mode_index] == 1)
                             ? x->rd_threshes[THR_NEW1]
                             : x->rd_threshes[THR_NEW3];
        this_rd_thresh = (vp8_ref_frame_order[mode_index] == 2)
                             ? x->rd_threshes[THR_NEW2]
                             : this_rd_thresh;

        tmp_rd = vp8_rd_pick_best_mbsegmentation(
            cpi, x, &best_ref_mv, best_mode.yrd, mdcounts, &rate, &rd.rate_y,
            &distortion, this_rd_thresh);

        rd.rate2 += rate;
        rd.distortion2 += distortion;

        /* If even the 'Y' rd value of split is higher than best so far
         * then don't bother looking at UV
         */
        if (tmp_rd < best_mode.yrd) {
          /* Now work out UV cost and add it in */
          rd_inter4x4_uv(cpi, x, &rd.rate_uv, &rd.distortion_uv,
                         cpi->common.full_pixel);
          rd.rate2 += rd.rate_uv;
          rd.distortion2 += rd.distortion_uv;
        } else {
          this_rd = INT_MAX;
          disable_skip = 1;
        }
        break;
      }
      case DC_PRED:
      case V_PRED:
      case H_PRED:
      case TM_PRED: {
        int distortion;
        x->e_mbd.mode_info_context->mbmi.ref_frame = INTRA_FRAME;

        vp8_build_intra_predictors_mby_s(
            xd, xd->dst.y_buffer - xd->dst.y_stride, xd->dst.y_buffer - 1,
            xd->dst.y_stride, xd->predictor, 16);
        macro_block_yrd(x, &rd.rate_y, &distortion);
        rd.rate2 += rd.rate_y;
        rd.distortion2 += distortion;
        rd.rate2 += x->mbmode_cost[x->e_mbd.frame_type]
                                  [x->e_mbd.mode_info_context->mbmi.mode];
        assert(uv_intra_done);
        rd.rate2 += uv_intra_rate;
        rd.rate_uv = uv_intra_rate_tokenonly;
        rd.distortion2 += uv_intra_distortion;
        rd.distortion_uv = uv_intra_distortion;
        break;
      }

      case NEWMV: {
        int thissme;
        int bestsme = INT_MAX;
        int step_param = cpi->sf.first_step;
        int further_steps;
        int n;
        /* 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 do_refine = 1;

        int sadpb = x->sadperbit16;
        int_mv mvp_full;

        int col_min = ((best_ref_mv.as_mv.col + 7) >> 3) - MAX_FULL_PEL_VAL;
        int row_min = ((best_ref_mv.as_mv.row + 7) >> 3) - MAX_FULL_PEL_VAL;
        int col_max = (best_ref_mv.as_mv.col >> 3) + MAX_FULL_PEL_VAL;
        int row_max = (best_ref_mv.as_mv.row >> 3) + MAX_FULL_PEL_VAL;

        int tmp_col_min = x->mv_col_min;
        int tmp_col_max = x->mv_col_max;
        int tmp_row_min = x->mv_row_min;
        int tmp_row_max = x->mv_row_max;

        if (!saddone) {
          vp8_cal_sad(cpi, xd, x, recon_yoffset, &near_sadidx[0]);
          saddone = 1;
        }

        vp8_mv_pred(cpi, &x->e_mbd, x->e_mbd.mode_info_context, &mvp,
                    x->e_mbd.mode_info_context->mbmi.ref_frame,
                    cpi->common.ref_frame_sign_bias, &sr, &near_sadidx[0]);

        mvp_full.as_mv.col = mvp.as_mv.col >> 3;
        mvp_full.as_mv.row = mvp.as_mv.row >> 3;

        /* 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;

        /* adjust search range according to sr from mv prediction */
        if (sr > step_param) step_param = sr;

        /* Initial step/diamond search */
        {
          bestsme = cpi->diamond_search_sad(
              x, b, d, &mvp_full, &d->bmi.mv, step_param, sadpb, &num00,
              &cpi->fn_ptr[BLOCK_16X16], x->mvcost, &best_ref_mv);
          mode_mv[NEWMV].as_int = d->bmi.mv.as_int;

          /* Further step/diamond searches as necessary */
          further_steps = (cpi->sf.max_step_search_steps - 1) - step_param;

          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, &d->bmi.mv, step_param + n, sadpb, &num00,
                  &cpi->fn_ptr[BLOCK_16X16], x->mvcost, &best_ref_mv);

              /* check to see if refining search is needed. */
              if (num00 > (further_steps - n)) do_refine = 0;

              if (thissme < bestsme) {
                bestsme = thissme;
                mode_mv[NEWMV].as_int = d->bmi.mv.as_int;
              } else {
                d->bmi.mv.as_int = mode_mv[NEWMV].as_int;
              }
            }
          }
        }

        /* final 1-away diamond refining search */
        if (do_refine == 1) {
          int search_range;

          search_range = 8;

          thissme = cpi->refining_search_sad(
              x, b, d, &d->bmi.mv, sadpb, search_range,
              &cpi->fn_ptr[BLOCK_16X16], x->mvcost, &best_ref_mv);

          if (thissme < bestsme) {
            bestsme = thissme;
            mode_mv[NEWMV].as_int = d->bmi.mv.as_int;
          } else {
            d->bmi.mv.as_int = mode_mv[NEWMV].as_int;
          }
        }

        x->mv_col_min = tmp_col_min;
        x->mv_col_max = tmp_col_max;
        x->mv_row_min = tmp_row_min;
        x->mv_row_max = tmp_row_max;

        if (bestsme < INT_MAX) {
          int dis; /* TODO: use dis in distortion calculation later. */
          unsigned int sse;
          cpi->find_fractional_mv_step(
              x, b, d, &d->bmi.mv, &best_ref_mv, x->errorperbit,
              &cpi->fn_ptr[BLOCK_16X16], x->mvcost, &dis, &sse);
        }

        mode_mv[NEWMV].as_int = d->bmi.mv.as_int;

        /* Add the new motion vector cost to our rolling cost variable */
        rd.rate2 +=
            vp8_mv_bit_cost(&mode_mv[NEWMV], &best_ref_mv, x->mvcost, 96);
      }
        // fall through

      case NEARESTMV:
      case NEARMV:
        /* Clip "next_nearest" so that it does not extend to far out
         * of image
         */
        vp8_clamp_mv2(&mode_mv[this_mode], xd);

        /* Do not bother proceeding if the vector (from newmv, nearest
         * or near) is 0,0 as this should then be coded using the zeromv
         * mode.
         */
        if (((this_mode == NEARMV) || (this_mode == NEARESTMV)) &&
            (mode_mv[this_mode].as_int == 0)) {
          continue;
        }
        // fall through

      case ZEROMV:

        /* Trap vectors that reach beyond the UMV borders
         * Note that ALL New MV, Nearest MV Near MV and Zero MV code
         * drops through to this point because of the lack of break
         * statements in the previous two cases.
         */
        if (((mode_mv[this_mode].as_mv.row >> 3) < x->mv_row_min) ||
            ((mode_mv[this_mode].as_mv.row >> 3) > x->mv_row_max) ||
            ((mode_mv[this_mode].as_mv.col >> 3) < x->mv_col_min) ||
            ((mode_mv[this_mode].as_mv.col >> 3) > x->mv_col_max)) {
          continue;
        }

        vp8_set_mbmode_and_mvs(x, this_mode, &mode_mv[this_mode]);
        this_rd = evaluate_inter_mode_rd(mdcounts, &rd, &disable_skip, cpi, x);
        break;

      default: break;
    }

    this_rd =
        calculate_final_rd_costs(this_rd, &rd, &other_cost, disable_skip,
                                 uv_intra_tteob, intra_rd_penalty, cpi, x);

    /* Keep record of best intra distortion */
    if ((x->e_mbd.mode_info_context->mbmi.ref_frame == INTRA_FRAME) &&
        (this_rd < best_mode.intra_rd)) {
      best_mode.intra_rd = this_rd;
      *returnintra = rd.distortion2;
    }
#if CONFIG_TEMPORAL_DENOISING
    if (cpi->oxcf.noise_sensitivity) {
      unsigned int sse;
      vp8_get_inter_mbpred_error(x, &cpi->fn_ptr[BLOCK_16X16], &sse,
                                 mode_mv[this_mode]);

      if (sse < best_rd_sse) best_rd_sse = sse;

      /* Store for later use by denoiser. */
      if (this_mode == ZEROMV && sse < zero_mv_sse) {
        zero_mv_sse = sse;
        x->best_zeromv_reference_frame =
            x->e_mbd.mode_info_context->mbmi.ref_frame;
      }

      /* Store the best NEWMV in x for later use in the denoiser. */
      if (x->e_mbd.mode_info_context->mbmi.mode == NEWMV && sse < best_sse) {
        best_sse = sse;
        vp8_get_inter_mbpred_error(x, &cpi->fn_ptr[BLOCK_16X16], &best_sse,
                                   mode_mv[this_mode]);
        x->best_sse_inter_mode = NEWMV;
        x->best_sse_mv = x->e_mbd.mode_info_context->mbmi.mv;
        x->need_to_clamp_best_mvs =
            x->e_mbd.mode_info_context->mbmi.need_to_clamp_mvs;
        x->best_reference_frame = x->e_mbd.mode_info_context->mbmi.ref_frame;
      }
    }
#endif

    /* Did this mode help.. i.i is it the new best mode */
    if (this_rd < best_mode.rd || x->skip) {
      /* Note index of best mode so far */
      best_mode_index = mode_index;
      *returnrate = rd.rate2;
      *returndistortion = rd.distortion2;
      if (this_mode <= B_PRED) {
        x->e_mbd.mode_info_context->mbmi.uv_mode = uv_intra_mode;
        /* required for left and above block mv */
        x->e_mbd.mode_info_context->mbmi.mv.as_int = 0;
      }
      update_best_mode(&best_mode, this_rd, &rd, other_cost, x);

      /* Testing this mode gave rise to an improvement in best error
       * score. Lower threshold a bit for next time
       */
      x->rd_thresh_mult[mode_index] =
          (x->rd_thresh_mult[mode_index] >= (MIN_THRESHMULT + 2))
              ? x->rd_thresh_mult[mode_index] - 2
              : MIN_THRESHMULT;
    }

    /* If the mode did not help improve the best error case then raise
     * the threshold for testing that mode next time around.
     */
    else {
      x->rd_thresh_mult[mode_index] += 4;

      if (x->rd_thresh_mult[mode_index] > MAX_THRESHMULT) {
        x->rd_thresh_mult[mode_index] = MAX_THRESHMULT;
      }
    }
    x->rd_threshes[mode_index] = (cpi->rd_baseline_thresh[mode_index] >> 7) *
                                 x->rd_thresh_mult[mode_index];

    if (x->skip) break;
  }

  /* Reduce the activation RD thresholds for the best choice mode */
  if ((cpi->rd_baseline_thresh[best_mode_index] > 0) &&
      (cpi->rd_baseline_thresh[best_mode_index] < (INT_MAX >> 2))) {
    int best_adjustment = (x->rd_thresh_mult[best_mode_index] >> 2);

    x->rd_thresh_mult[best_mode_index] =
        (x->rd_thresh_mult[best_mode_index] >=
         (MIN_THRESHMULT + best_adjustment))
            ? x->rd_thresh_mult[best_mode_index] - best_adjustment
            : MIN_THRESHMULT;
    x->rd_threshes[best_mode_index] =
        (cpi->rd_baseline_thresh[best_mode_index] >> 7) *
        x->rd_thresh_mult[best_mode_index];
  }

#if CONFIG_TEMPORAL_DENOISING
  if (cpi->oxcf.noise_sensitivity) {
    int block_index = mb_row * cpi->common.mb_cols + mb_col;
    if (x->best_sse_inter_mode == DC_PRED) {
      /* No best MV found. */
      x->best_sse_inter_mode = best_mode.mbmode.mode;
      x->best_sse_mv = best_mode.mbmode.mv;
      x->need_to_clamp_best_mvs = best_mode.mbmode.need_to_clamp_mvs;
      x->best_reference_frame = best_mode.mbmode.ref_frame;
      best_sse = best_rd_sse;
    }
    vp8_denoiser_denoise_mb(&cpi->denoiser, x, best_sse, zero_mv_sse,
                            recon_yoffset, recon_uvoffset, &cpi->common.lf_info,
                            mb_row, mb_col, block_index, 0);

    /* Reevaluate ZEROMV after denoising. */
    if (best_mode.mbmode.ref_frame == INTRA_FRAME &&
        x->best_zeromv_reference_frame != INTRA_FRAME) {
      int this_rd = INT_MAX;
      int disable_skip = 0;
      int other_cost = 0;
      int this_ref_frame = x->best_zeromv_reference_frame;
      rd.rate2 =
          x->ref_frame_cost[this_ref_frame] + vp8_cost_mv_ref(ZEROMV, mdcounts);
      rd.distortion2 = 0;

      /* set up the proper prediction buffers for the frame */
      x->e_mbd.mode_info_context->mbmi.ref_frame = this_ref_frame;
      x->e_mbd.pre.y_buffer = plane[this_ref_frame][0];
      x->e_mbd.pre.u_buffer = plane[this_ref_frame][1];
      x->e_mbd.pre.v_buffer = plane[this_ref_frame][2];

      x->e_mbd.mode_info_context->mbmi.mode = ZEROMV;
      x->e_mbd.mode_info_context->mbmi.uv_mode = DC_PRED;
      x->e_mbd.mode_info_context->mbmi.mv.as_int = 0;

      this_rd = evaluate_inter_mode_rd(mdcounts, &rd, &disable_skip, cpi, x);
      this_rd =
          calculate_final_rd_costs(this_rd, &rd, &other_cost, disable_skip,
                                   uv_intra_tteob, intra_rd_penalty, cpi, x);
      if (this_rd < best_mode.rd || x->skip) {
        *returnrate = rd.rate2;
        *returndistortion = rd.distortion2;
        update_best_mode(&best_mode, this_rd, &rd, other_cost, x);
      }
    }
  }
#endif

  if (cpi->is_src_frame_alt_ref &&
      (best_mode.mbmode.mode != ZEROMV ||
       best_mode.mbmode.ref_frame != ALTREF_FRAME)) {
    x->e_mbd.mode_info_context->mbmi.mode = ZEROMV;
    x->e_mbd.mode_info_context->mbmi.ref_frame = ALTREF_FRAME;
    x->e_mbd.mode_info_context->mbmi.mv.as_int = 0;
    x->e_mbd.mode_info_context->mbmi.uv_mode = DC_PRED;
    x->e_mbd.mode_info_context->mbmi.mb_skip_coeff =
        (cpi->common.mb_no_coeff_skip);
    x->e_mbd.mode_info_context->mbmi.partitioning = 0;
    return;
  }

  /* macroblock modes */
  x->e_mbd.mode_info_context->mbmi = best_mode.mbmode;

  if (best_mode.mbmode.mode == B_PRED) {
    for (i = 0; i < 16; ++i) {
      xd->mode_info_context->bmi[i].as_mode = best_mode.bmodes[i].as_mode;
    }
  }

  if (best_mode.mbmode.mode == SPLITMV) {
    for (i = 0; i < 16; ++i) {
      xd->mode_info_context->bmi[i].mv.as_int = best_mode.bmodes[i].mv.as_int;
    }

    *x->partition_info = best_mode.partition;

    x->e_mbd.mode_info_context->mbmi.mv.as_int =
        x->partition_info->bmi[15].mv.as_int;
  }

  if (sign_bias !=
      cpi->common.ref_frame_sign_bias[xd->mode_info_context->mbmi.ref_frame]) {
    best_ref_mv.as_int = best_ref_mv_sb[!sign_bias].as_int;
  }

  rd_update_mvcount(x, &best_ref_mv);
}

void vp8_rd_pick_intra_mode(MACROBLOCK *x, int *rate) {
  int error4x4, error16x16;
  int rate4x4, rate16x16 = 0, rateuv;
  int dist4x4, dist16x16, distuv;
  int rate_;
  int rate4x4_tokenonly = 0;
  int rate16x16_tokenonly = 0;
  int rateuv_tokenonly = 0;

  x->e_mbd.mode_info_context->mbmi.ref_frame = INTRA_FRAME;

  rd_pick_intra_mbuv_mode(x, &rateuv, &rateuv_tokenonly, &distuv);
  rate_ = rateuv;

  error16x16 = rd_pick_intra16x16mby_mode(x, &rate16x16, &rate16x16_tokenonly,
                                          &dist16x16);

  error4x4 = rd_pick_intra4x4mby_modes(x, &rate4x4, &rate4x4_tokenonly,
                                       &dist4x4, error16x16);

  if (error4x4 < error16x16) {
    x->e_mbd.mode_info_context->mbmi.mode = B_PRED;
    rate_ += rate4x4;
  } else {
    rate_ += rate16x16;
  }

  *rate = rate_;
}

Coverage Report

Created: 2025-08-28 07:12