encodeframe.c 123 KB
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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 <limits.h>
#include <math.h>
#include <stdio.h>

#include "./vp10_rtcd.h"
#include "./vpx_dsp_rtcd.h"
#include "./vpx_config.h"

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#include "vpx_dsp/vpx_dsp_common.h"
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#include "vpx_ports/mem.h"
#include "vpx_ports/vpx_timer.h"
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#include "vpx_ports/system_state.h"
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#include "vp10/common/common.h"
#include "vp10/common/entropy.h"
#include "vp10/common/entropymode.h"
#include "vp10/common/idct.h"
#include "vp10/common/mvref_common.h"
#include "vp10/common/pred_common.h"
#include "vp10/common/quant_common.h"
#include "vp10/common/reconintra.h"
#include "vp10/common/reconinter.h"
#include "vp10/common/seg_common.h"
#include "vp10/common/tile_common.h"
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#include "vp10/encoder/aq_complexity.h"
#include "vp10/encoder/aq_cyclicrefresh.h"
#include "vp10/encoder/aq_variance.h"
#include "vp10/encoder/encodeframe.h"
#include "vp10/encoder/encodemb.h"
#include "vp10/encoder/encodemv.h"
#include "vp10/encoder/ethread.h"
#include "vp10/encoder/extend.h"
#include "vp10/encoder/rd.h"
#include "vp10/encoder/rdopt.h"
#include "vp10/encoder/segmentation.h"
#include "vp10/encoder/tokenize.h"
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static void encode_superblock(VP10_COMP *cpi, ThreadData * td,
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                              TOKENEXTRA **t, int output_enabled,
                              int mi_row, int mi_col, BLOCK_SIZE bsize,
                              PICK_MODE_CONTEXT *ctx);

// This is used as a reference when computing the source variance for the
//  purposes of activity masking.
// Eventually this should be replaced by custom no-reference routines,
//  which will be faster.
static const uint8_t VP9_VAR_OFFS[64] = {
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128
};

#if CONFIG_VP9_HIGHBITDEPTH
static const uint16_t VP9_HIGH_VAR_OFFS_8[64] = {
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128,
    128, 128, 128, 128, 128, 128, 128, 128
};

static const uint16_t VP9_HIGH_VAR_OFFS_10[64] = {
    128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4,
    128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4,
    128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4,
    128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4,
    128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4,
    128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4,
    128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4,
    128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4, 128*4
};

static const uint16_t VP9_HIGH_VAR_OFFS_12[64] = {
    128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16,
    128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16,
    128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16,
    128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16,
    128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16,
    128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16,
    128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16,
    128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16, 128*16
};
#endif  // CONFIG_VP9_HIGHBITDEPTH

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unsigned int vp10_get_sby_perpixel_variance(VP10_COMP *cpi,
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                                           const struct buf_2d *ref,
                                           BLOCK_SIZE bs) {
  unsigned int sse;
  const unsigned int var = cpi->fn_ptr[bs].vf(ref->buf, ref->stride,
                                              VP9_VAR_OFFS, 0, &sse);
  return ROUND_POWER_OF_TWO(var, num_pels_log2_lookup[bs]);
}

#if CONFIG_VP9_HIGHBITDEPTH
unsigned int vp10_high_get_sby_perpixel_variance(
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    VP10_COMP *cpi, const struct buf_2d *ref, BLOCK_SIZE bs, int bd) {
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  unsigned int var, sse;
  switch (bd) {
    case 10:
      var = cpi->fn_ptr[bs].vf(ref->buf, ref->stride,
                               CONVERT_TO_BYTEPTR(VP9_HIGH_VAR_OFFS_10),
                               0, &sse);
      break;
    case 12:
      var = cpi->fn_ptr[bs].vf(ref->buf, ref->stride,
                               CONVERT_TO_BYTEPTR(VP9_HIGH_VAR_OFFS_12),
                               0, &sse);
      break;
    case 8:
    default:
      var = cpi->fn_ptr[bs].vf(ref->buf, ref->stride,
                               CONVERT_TO_BYTEPTR(VP9_HIGH_VAR_OFFS_8),
                               0, &sse);
      break;
  }
  return ROUND_POWER_OF_TWO(var, num_pels_log2_lookup[bs]);
}
#endif  // CONFIG_VP9_HIGHBITDEPTH

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static unsigned int get_sby_perpixel_diff_variance(VP10_COMP *cpi,
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                                                   const struct buf_2d *ref,
                                                   int mi_row, int mi_col,
                                                   BLOCK_SIZE bs) {
  unsigned int sse, var;
  uint8_t *last_y;
  const YV12_BUFFER_CONFIG *last = get_ref_frame_buffer(cpi, LAST_FRAME);

  assert(last != NULL);
  last_y =
      &last->y_buffer[mi_row * MI_SIZE * last->y_stride + mi_col * MI_SIZE];
  var = cpi->fn_ptr[bs].vf(ref->buf, ref->stride, last_y, last->y_stride, &sse);
  return ROUND_POWER_OF_TWO(var, num_pels_log2_lookup[bs]);
}

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static BLOCK_SIZE get_rd_var_based_fixed_partition(VP10_COMP *cpi,
                                                   MACROBLOCK *x,
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                                                   int mi_row,
                                                   int mi_col) {
  unsigned int var = get_sby_perpixel_diff_variance(cpi, &x->plane[0].src,
                                                    mi_row, mi_col,
                                                    BLOCK_64X64);
  if (var < 8)
    return BLOCK_64X64;
  else if (var < 128)
    return BLOCK_32X32;
  else if (var < 2048)
    return BLOCK_16X16;
  else
    return BLOCK_8X8;
}

// Lighter version of set_offsets that only sets the mode info
// pointers.
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static INLINE void set_mode_info_offsets(VP10_COMP *const cpi,
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                                         MACROBLOCK *const x,
                                         MACROBLOCKD *const xd,
                                         int mi_row,
                                         int mi_col) {
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  VP10_COMMON *const cm = &cpi->common;
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  const int idx_str = xd->mi_stride * mi_row + mi_col;
  xd->mi = cm->mi_grid_visible + idx_str;
  xd->mi[0] = cm->mi + idx_str;
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  x->mbmi_ext = cpi->mbmi_ext_base + (mi_row * cm->mi_cols + mi_col);
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}

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static void set_offsets(VP10_COMP *cpi, const TileInfo *const tile,
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                        MACROBLOCK *const x, int mi_row, int mi_col,
                        BLOCK_SIZE bsize) {
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  VP10_COMMON *const cm = &cpi->common;
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  MACROBLOCKD *const xd = &x->e_mbd;
  MB_MODE_INFO *mbmi;
  const int mi_width = num_8x8_blocks_wide_lookup[bsize];
  const int mi_height = num_8x8_blocks_high_lookup[bsize];
  const struct segmentation *const seg = &cm->seg;

  set_skip_context(xd, mi_row, mi_col);

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  set_mode_info_offsets(cpi, x, xd, mi_row, mi_col);
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#if CONFIG_VAR_TX
  xd->above_txfm_context = cm->above_txfm_context + mi_col;
  xd->left_txfm_context = xd->left_txfm_context_buffer + (mi_row & 0x07);
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  xd->max_tx_size = max_txsize_lookup[bsize];
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#endif

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  mbmi = &xd->mi[0]->mbmi;

  // Set up destination pointers.
  vp10_setup_dst_planes(xd->plane, get_frame_new_buffer(cm), mi_row, mi_col);

  // Set up limit values for MV components.
  // Mv beyond the range do not produce new/different prediction block.
  x->mv_row_min = -(((mi_row + mi_height) * MI_SIZE) + VP9_INTERP_EXTEND);
  x->mv_col_min = -(((mi_col + mi_width) * MI_SIZE) + VP9_INTERP_EXTEND);
  x->mv_row_max = (cm->mi_rows - mi_row) * MI_SIZE + VP9_INTERP_EXTEND;
  x->mv_col_max = (cm->mi_cols - mi_col) * MI_SIZE + VP9_INTERP_EXTEND;

  // Set up distance of MB to edge of frame in 1/8th pel units.
  assert(!(mi_col & (mi_width - 1)) && !(mi_row & (mi_height - 1)));
  set_mi_row_col(xd, tile, mi_row, mi_height, mi_col, mi_width,
                 cm->mi_rows, cm->mi_cols);

  // Set up source buffers.
  vp10_setup_src_planes(x, cpi->Source, mi_row, mi_col);

  // R/D setup.
  x->rddiv = cpi->rd.RDDIV;
  x->rdmult = cpi->rd.RDMULT;

  // Setup segment ID.
  if (seg->enabled) {
    if (cpi->oxcf.aq_mode != VARIANCE_AQ) {
      const uint8_t *const map = seg->update_map ? cpi->segmentation_map
                                                 : cm->last_frame_seg_map;
      mbmi->segment_id = get_segment_id(cm, map, bsize, mi_row, mi_col);
    }
    vp10_init_plane_quantizers(cpi, x);

    x->encode_breakout = cpi->segment_encode_breakout[mbmi->segment_id];
  } else {
    mbmi->segment_id = 0;
    x->encode_breakout = cpi->encode_breakout;
  }

  // required by vp10_append_sub8x8_mvs_for_idx() and vp10_find_best_ref_mvs()
  xd->tile = *tile;
}

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static void set_block_size(VP10_COMP * const cpi,
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                           MACROBLOCK *const x,
                           MACROBLOCKD *const xd,
                           int mi_row, int mi_col,
                           BLOCK_SIZE bsize) {
  if (cpi->common.mi_cols > mi_col && cpi->common.mi_rows > mi_row) {
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    set_mode_info_offsets(cpi, x, xd, mi_row, mi_col);
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    xd->mi[0]->mbmi.sb_type = bsize;
  }
}

typedef struct {
  int64_t sum_square_error;
  int64_t sum_error;
  int log2_count;
  int variance;
} var;

typedef struct {
  var none;
  var horz[2];
  var vert[2];
} partition_variance;

typedef struct {
  partition_variance part_variances;
  var split[4];
} v4x4;

typedef struct {
  partition_variance part_variances;
  v4x4 split[4];
} v8x8;

typedef struct {
  partition_variance part_variances;
  v8x8 split[4];
} v16x16;

typedef struct {
  partition_variance part_variances;
  v16x16 split[4];
} v32x32;

typedef struct {
  partition_variance part_variances;
  v32x32 split[4];
} v64x64;

typedef struct {
  partition_variance *part_variances;
  var *split[4];
} variance_node;

typedef enum {
  V16X16,
  V32X32,
  V64X64,
} TREE_LEVEL;

static void tree_to_node(void *data, BLOCK_SIZE bsize, variance_node *node) {
  int i;
  node->part_variances = NULL;
  switch (bsize) {
    case BLOCK_64X64: {
      v64x64 *vt = (v64x64 *) data;
      node->part_variances = &vt->part_variances;
      for (i = 0; i < 4; i++)
        node->split[i] = &vt->split[i].part_variances.none;
      break;
    }
    case BLOCK_32X32: {
      v32x32 *vt = (v32x32 *) data;
      node->part_variances = &vt->part_variances;
      for (i = 0; i < 4; i++)
        node->split[i] = &vt->split[i].part_variances.none;
      break;
    }
    case BLOCK_16X16: {
      v16x16 *vt = (v16x16 *) data;
      node->part_variances = &vt->part_variances;
      for (i = 0; i < 4; i++)
        node->split[i] = &vt->split[i].part_variances.none;
      break;
    }
    case BLOCK_8X8: {
      v8x8 *vt = (v8x8 *) data;
      node->part_variances = &vt->part_variances;
      for (i = 0; i < 4; i++)
        node->split[i] = &vt->split[i].part_variances.none;
      break;
    }
    case BLOCK_4X4: {
      v4x4 *vt = (v4x4 *) data;
      node->part_variances = &vt->part_variances;
      for (i = 0; i < 4; i++)
        node->split[i] = &vt->split[i];
      break;
    }
    default: {
      assert(0);
      break;
    }
  }
}

// Set variance values given sum square error, sum error, count.
static void fill_variance(int64_t s2, int64_t s, int c, var *v) {
  v->sum_square_error = s2;
  v->sum_error = s;
  v->log2_count = c;
}

static void get_variance(var *v) {
  v->variance = (int)(256 * (v->sum_square_error -
      ((v->sum_error * v->sum_error) >> v->log2_count)) >> v->log2_count);
}

static void sum_2_variances(const var *a, const var *b, var *r) {
  assert(a->log2_count == b->log2_count);
  fill_variance(a->sum_square_error + b->sum_square_error,
                a->sum_error + b->sum_error, a->log2_count + 1, r);
}

static void fill_variance_tree(void *data, BLOCK_SIZE bsize) {
  variance_node node;
  memset(&node, 0, sizeof(node));
  tree_to_node(data, bsize, &node);
  sum_2_variances(node.split[0], node.split[1], &node.part_variances->horz[0]);
  sum_2_variances(node.split[2], node.split[3], &node.part_variances->horz[1]);
  sum_2_variances(node.split[0], node.split[2], &node.part_variances->vert[0]);
  sum_2_variances(node.split[1], node.split[3], &node.part_variances->vert[1]);
  sum_2_variances(&node.part_variances->vert[0], &node.part_variances->vert[1],
                  &node.part_variances->none);
}

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static int set_vt_partitioning(VP10_COMP *cpi,
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                               MACROBLOCK *const x,
                               MACROBLOCKD *const xd,
                               void *data,
                               BLOCK_SIZE bsize,
                               int mi_row,
                               int mi_col,
                               int64_t threshold,
                               BLOCK_SIZE bsize_min,
                               int force_split) {
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  VP10_COMMON * const cm = &cpi->common;
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  variance_node vt;
  const int block_width = num_8x8_blocks_wide_lookup[bsize];
  const int block_height = num_8x8_blocks_high_lookup[bsize];
  const int low_res = (cm->width <= 352 && cm->height <= 288);

  assert(block_height == block_width);
  tree_to_node(data, bsize, &vt);

  if (force_split == 1)
    return 0;

  // For bsize=bsize_min (16x16/8x8 for 8x8/4x4 downsampling), select if
  // variance is below threshold, otherwise split will be selected.
  // No check for vert/horiz split as too few samples for variance.
  if (bsize == bsize_min) {
    // Variance already computed to set the force_split.
    if (low_res || cm->frame_type == KEY_FRAME)
      get_variance(&vt.part_variances->none);
    if (mi_col + block_width / 2 < cm->mi_cols &&
        mi_row + block_height / 2 < cm->mi_rows &&
        vt.part_variances->none.variance < threshold) {
      set_block_size(cpi, x, xd, mi_row, mi_col, bsize);
      return 1;
    }
    return 0;
  } else if (bsize > bsize_min) {
    // Variance already computed to set the force_split.
    if (low_res || cm->frame_type == KEY_FRAME)
      get_variance(&vt.part_variances->none);
    // For key frame: take split for bsize above 32X32 or very high variance.
    if (cm->frame_type == KEY_FRAME &&
        (bsize > BLOCK_32X32 ||
        vt.part_variances->none.variance > (threshold << 4))) {
      return 0;
    }
    // If variance is low, take the bsize (no split).
    if (mi_col + block_width / 2 < cm->mi_cols &&
        mi_row + block_height / 2 < cm->mi_rows &&
        vt.part_variances->none.variance < threshold) {
      set_block_size(cpi, x, xd, mi_row, mi_col, bsize);
      return 1;
    }

    // Check vertical split.
    if (mi_row + block_height / 2 < cm->mi_rows) {
      BLOCK_SIZE subsize = get_subsize(bsize, PARTITION_VERT);
      get_variance(&vt.part_variances->vert[0]);
      get_variance(&vt.part_variances->vert[1]);
      if (vt.part_variances->vert[0].variance < threshold &&
          vt.part_variances->vert[1].variance < threshold &&
          get_plane_block_size(subsize, &xd->plane[1]) < BLOCK_INVALID) {
        set_block_size(cpi, x, xd, mi_row, mi_col, subsize);
        set_block_size(cpi, x, xd, mi_row, mi_col + block_width / 2, subsize);
        return 1;
      }
    }
    // Check horizontal split.
    if (mi_col + block_width / 2 < cm->mi_cols) {
      BLOCK_SIZE subsize = get_subsize(bsize, PARTITION_HORZ);
      get_variance(&vt.part_variances->horz[0]);
      get_variance(&vt.part_variances->horz[1]);
      if (vt.part_variances->horz[0].variance < threshold &&
          vt.part_variances->horz[1].variance < threshold &&
          get_plane_block_size(subsize, &xd->plane[1]) < BLOCK_INVALID) {
        set_block_size(cpi, x, xd, mi_row, mi_col, subsize);
        set_block_size(cpi, x, xd, mi_row + block_height / 2, mi_col, subsize);
        return 1;
      }
    }

    return 0;
  }
  return 0;
}

// Set the variance split thresholds for following the block sizes:
// 0 - threshold_64x64, 1 - threshold_32x32, 2 - threshold_16x16,
// 3 - vbp_threshold_8x8. vbp_threshold_8x8 (to split to 4x4 partition) is
// currently only used on key frame.
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static void set_vbp_thresholds(VP10_COMP *cpi, int64_t thresholds[], int q) {
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  VP10_COMMON *const cm = &cpi->common;
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  const int is_key_frame = (cm->frame_type == KEY_FRAME);
  const int threshold_multiplier = is_key_frame ? 20 : 1;
  const int64_t threshold_base = (int64_t)(threshold_multiplier *
      cpi->y_dequant[q][1]);
  if (is_key_frame) {
    thresholds[0] = threshold_base;
    thresholds[1] = threshold_base >> 2;
    thresholds[2] = threshold_base >> 2;
    thresholds[3] = threshold_base << 2;
  } else {
    thresholds[1] = threshold_base;
    if (cm->width <= 352 && cm->height <= 288) {
      thresholds[0] = threshold_base >> 2;
      thresholds[2] = threshold_base << 3;
    } else {
      thresholds[0] = threshold_base;
      thresholds[1] = (5 * threshold_base) >> 2;
      if (cm->width >= 1920 && cm->height >= 1080)
        thresholds[1] = (7 * threshold_base) >> 2;
      thresholds[2] = threshold_base << cpi->oxcf.speed;
    }
  }
}

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void vp10_set_variance_partition_thresholds(VP10_COMP *cpi, int q) {
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  VP10_COMMON *const cm = &cpi->common;
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  SPEED_FEATURES *const sf = &cpi->sf;
  const int is_key_frame = (cm->frame_type == KEY_FRAME);
  if (sf->partition_search_type != VAR_BASED_PARTITION &&
      sf->partition_search_type != REFERENCE_PARTITION) {
    return;
  } else {
    set_vbp_thresholds(cpi, cpi->vbp_thresholds, q);
    // The thresholds below are not changed locally.
    if (is_key_frame) {
      cpi->vbp_threshold_sad = 0;
      cpi->vbp_bsize_min = BLOCK_8X8;
    } else {
      if (cm->width <= 352 && cm->height <= 288)
        cpi->vbp_threshold_sad = 100;
      else
        cpi->vbp_threshold_sad = (cpi->y_dequant[q][1] << 1) > 1000 ?
            (cpi->y_dequant[q][1] << 1) : 1000;
      cpi->vbp_bsize_min = BLOCK_16X16;
    }
    cpi->vbp_threshold_minmax = 15 + (q >> 3);
  }
}

// Compute the minmax over the 8x8 subblocks.
static int compute_minmax_8x8(const uint8_t *s, int sp, const uint8_t *d,
                              int dp, int x16_idx, int y16_idx,
#if CONFIG_VP9_HIGHBITDEPTH
                              int highbd_flag,
#endif
                              int pixels_wide,
                              int pixels_high) {
  int k;
  int minmax_max = 0;
  int minmax_min = 255;
  // Loop over the 4 8x8 subblocks.
  for (k = 0; k < 4; k++) {
    int x8_idx = x16_idx + ((k & 1) << 3);
    int y8_idx = y16_idx + ((k >> 1) << 3);
    int min = 0;
    int max = 0;
    if (x8_idx < pixels_wide && y8_idx < pixels_high) {
#if CONFIG_VP9_HIGHBITDEPTH
      if (highbd_flag & YV12_FLAG_HIGHBITDEPTH) {
        vp10_highbd_minmax_8x8(s + y8_idx * sp + x8_idx, sp,
                              d + y8_idx * dp + x8_idx, dp,
                              &min, &max);
      } else {
        vp10_minmax_8x8(s + y8_idx * sp + x8_idx, sp,
                       d + y8_idx * dp + x8_idx, dp,
                       &min, &max);
      }
#else
      vp10_minmax_8x8(s + y8_idx * sp + x8_idx, sp,
                     d + y8_idx * dp + x8_idx, dp,
                     &min, &max);
#endif
      if ((max - min) > minmax_max)
        minmax_max = (max - min);
      if ((max - min) < minmax_min)
        minmax_min = (max - min);
    }
  }
  return (minmax_max - minmax_min);
}

static void fill_variance_4x4avg(const uint8_t *s, int sp, const uint8_t *d,
                                 int dp, int x8_idx, int y8_idx, v8x8 *vst,
#if CONFIG_VP9_HIGHBITDEPTH
                                 int highbd_flag,
#endif
                                 int pixels_wide,
                                 int pixels_high,
                                 int is_key_frame) {
  int k;
  for (k = 0; k < 4; k++) {
    int x4_idx = x8_idx + ((k & 1) << 2);
    int y4_idx = y8_idx + ((k >> 1) << 2);
    unsigned int sse = 0;
    int sum = 0;
    if (x4_idx < pixels_wide && y4_idx < pixels_high) {
      int s_avg;
      int d_avg = 128;
#if CONFIG_VP9_HIGHBITDEPTH
      if (highbd_flag & YV12_FLAG_HIGHBITDEPTH) {
        s_avg = vp10_highbd_avg_4x4(s + y4_idx * sp + x4_idx, sp);
        if (!is_key_frame)
          d_avg = vp10_highbd_avg_4x4(d + y4_idx * dp + x4_idx, dp);
      } else {
        s_avg = vp10_avg_4x4(s + y4_idx * sp + x4_idx, sp);
        if (!is_key_frame)
          d_avg = vp10_avg_4x4(d + y4_idx * dp + x4_idx, dp);
      }
#else
      s_avg = vp10_avg_4x4(s + y4_idx * sp + x4_idx, sp);
      if (!is_key_frame)
        d_avg = vp10_avg_4x4(d + y4_idx * dp + x4_idx, dp);
#endif
      sum = s_avg - d_avg;
      sse = sum * sum;
    }
    fill_variance(sse, sum, 0, &vst->split[k].part_variances.none);
  }
}

static void fill_variance_8x8avg(const uint8_t *s, int sp, const uint8_t *d,
                                 int dp, int x16_idx, int y16_idx, v16x16 *vst,
#if CONFIG_VP9_HIGHBITDEPTH
                                 int highbd_flag,
#endif
                                 int pixels_wide,
                                 int pixels_high,
                                 int is_key_frame) {
  int k;
  for (k = 0; k < 4; k++) {
    int x8_idx = x16_idx + ((k & 1) << 3);
    int y8_idx = y16_idx + ((k >> 1) << 3);
    unsigned int sse = 0;
    int sum = 0;
    if (x8_idx < pixels_wide && y8_idx < pixels_high) {
      int s_avg;
      int d_avg = 128;
#if CONFIG_VP9_HIGHBITDEPTH
      if (highbd_flag & YV12_FLAG_HIGHBITDEPTH) {
        s_avg = vp10_highbd_avg_8x8(s + y8_idx * sp + x8_idx, sp);
        if (!is_key_frame)
          d_avg = vp10_highbd_avg_8x8(d + y8_idx * dp + x8_idx, dp);
      } else {
        s_avg = vp10_avg_8x8(s + y8_idx * sp + x8_idx, sp);
        if (!is_key_frame)
          d_avg = vp10_avg_8x8(d + y8_idx * dp + x8_idx, dp);
      }
#else
      s_avg = vp10_avg_8x8(s + y8_idx * sp + x8_idx, sp);
      if (!is_key_frame)
        d_avg = vp10_avg_8x8(d + y8_idx * dp + x8_idx, dp);
#endif
      sum = s_avg - d_avg;
      sse = sum * sum;
    }
    fill_variance(sse, sum, 0, &vst->split[k].part_variances.none);
  }
}

// This function chooses partitioning based on the variance between source and
// reconstructed last, where variance is computed for down-sampled inputs.
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static int choose_partitioning(VP10_COMP *cpi,
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                                const TileInfo *const tile,
                                MACROBLOCK *x,
                                int mi_row, int mi_col) {
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  VP10_COMMON * const cm = &cpi->common;
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  MACROBLOCKD *xd = &x->e_mbd;
  int i, j, k, m;
  v64x64 vt;
  v16x16 vt2[16];
  int force_split[21];
  uint8_t *s;
  const uint8_t *d;
  int sp;
  int dp;
  int pixels_wide = 64, pixels_high = 64;
  int64_t thresholds[4] = {cpi->vbp_thresholds[0], cpi->vbp_thresholds[1],
      cpi->vbp_thresholds[2], cpi->vbp_thresholds[3]};

  // Always use 4x4 partition for key frame.
  const int is_key_frame = (cm->frame_type == KEY_FRAME);
  const int use_4x4_partition = is_key_frame;
  const int low_res = (cm->width <= 352 && cm->height <= 288);
  int variance4x4downsample[16];

  int segment_id = CR_SEGMENT_ID_BASE;
  if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ && cm->seg.enabled) {
    const uint8_t *const map = cm->seg.update_map ? cpi->segmentation_map :
                                                    cm->last_frame_seg_map;
    segment_id = get_segment_id(cm, map, BLOCK_64X64, mi_row, mi_col);

    if (cyclic_refresh_segment_id_boosted(segment_id)) {
      int q = vp10_get_qindex(&cm->seg, segment_id, cm->base_qindex);
      set_vbp_thresholds(cpi, thresholds, q);
    }
  }

  set_offsets(cpi, tile, x, mi_row, mi_col, BLOCK_64X64);

  if (xd->mb_to_right_edge < 0)
    pixels_wide += (xd->mb_to_right_edge >> 3);
  if (xd->mb_to_bottom_edge < 0)
    pixels_high += (xd->mb_to_bottom_edge >> 3);

  s = x->plane[0].src.buf;
  sp = x->plane[0].src.stride;

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  if (!is_key_frame) {
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    MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
    unsigned int uv_sad;
    const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_buffer(cpi, LAST_FRAME);

    const YV12_BUFFER_CONFIG *yv12_g = NULL;
    unsigned int y_sad, y_sad_g;
    const BLOCK_SIZE bsize = BLOCK_32X32
        + (mi_col + 4 < cm->mi_cols) * 2 + (mi_row + 4 < cm->mi_rows);

    assert(yv12 != NULL);
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    yv12_g = get_ref_frame_buffer(cpi, GOLDEN_FRAME);
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    if (yv12_g && yv12_g != yv12) {
      vp10_setup_pre_planes(xd, 0, yv12_g, mi_row, mi_col,
                           &cm->frame_refs[GOLDEN_FRAME - 1].sf);
      y_sad_g = cpi->fn_ptr[bsize].sdf(x->plane[0].src.buf,
                                       x->plane[0].src.stride,
                                       xd->plane[0].pre[0].buf,
                                       xd->plane[0].pre[0].stride);
    } else {
      y_sad_g = UINT_MAX;
    }

    vp10_setup_pre_planes(xd, 0, yv12, mi_row, mi_col,
                         &cm->frame_refs[LAST_FRAME - 1].sf);
    mbmi->ref_frame[0] = LAST_FRAME;
    mbmi->ref_frame[1] = NONE;
    mbmi->sb_type = BLOCK_64X64;
    mbmi->mv[0].as_int = 0;
    mbmi->interp_filter = BILINEAR;

    y_sad = vp10_int_pro_motion_estimation(cpi, x, bsize, mi_row, mi_col);
    if (y_sad_g < y_sad) {
      vp10_setup_pre_planes(xd, 0, yv12_g, mi_row, mi_col,
                           &cm->frame_refs[GOLDEN_FRAME - 1].sf);
      mbmi->ref_frame[0] = GOLDEN_FRAME;
      mbmi->mv[0].as_int = 0;
      y_sad = y_sad_g;
    } else {
      x->pred_mv[LAST_FRAME] = mbmi->mv[0].as_mv;
    }

    vp10_build_inter_predictors_sb(xd, mi_row, mi_col, BLOCK_64X64);

    for (i = 1; i <= 2; ++i) {
      struct macroblock_plane  *p = &x->plane[i];
      struct macroblockd_plane *pd = &xd->plane[i];
      const BLOCK_SIZE bs = get_plane_block_size(bsize, pd);

      if (bs == BLOCK_INVALID)
        uv_sad = UINT_MAX;
      else
        uv_sad = cpi->fn_ptr[bs].sdf(p->src.buf, p->src.stride,
                                     pd->dst.buf, pd->dst.stride);

      x->color_sensitivity[i - 1] = uv_sad > (y_sad >> 2);
    }

    d = xd->plane[0].dst.buf;
    dp = xd->plane[0].dst.stride;

    // If the y_sad is very small, take 64x64 as partition and exit.
    // Don't check on boosted segment for now, as 64x64 is suppressed there.
    if (segment_id == CR_SEGMENT_ID_BASE &&
        y_sad < cpi->vbp_threshold_sad) {
      const int block_width = num_8x8_blocks_wide_lookup[BLOCK_64X64];
      const int block_height = num_8x8_blocks_high_lookup[BLOCK_64X64];
      if (mi_col + block_width / 2 < cm->mi_cols &&
          mi_row + block_height / 2 < cm->mi_rows) {
        set_block_size(cpi, x, xd, mi_row, mi_col, BLOCK_64X64);
        return 0;
      }
    }
  } else {
    d = VP9_VAR_OFFS;
    dp = 0;
#if CONFIG_VP9_HIGHBITDEPTH
    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
      switch (xd->bd) {
        case 10:
          d = CONVERT_TO_BYTEPTR(VP9_HIGH_VAR_OFFS_10);
          break;
        case 12:
          d = CONVERT_TO_BYTEPTR(VP9_HIGH_VAR_OFFS_12);
          break;
        case 8:
        default:
          d = CONVERT_TO_BYTEPTR(VP9_HIGH_VAR_OFFS_8);
          break;
      }
    }
#endif  // CONFIG_VP9_HIGHBITDEPTH
  }

  // Index for force_split: 0 for 64x64, 1-4 for 32x32 blocks,
  // 5-20 for the 16x16 blocks.
  force_split[0] = 0;
  // Fill in the entire tree of 8x8 (or 4x4 under some conditions) variances
  // for splits.
  for (i = 0; i < 4; i++) {
    const int x32_idx = ((i & 1) << 5);
    const int y32_idx = ((i >> 1) << 5);
    const int i2 = i << 2;
    force_split[i + 1] = 0;
    for (j = 0; j < 4; j++) {
      const int x16_idx = x32_idx + ((j & 1) << 4);
      const int y16_idx = y32_idx + ((j >> 1) << 4);
      const int split_index = 5 + i2 + j;
      v16x16 *vst = &vt.split[i].split[j];
      force_split[split_index] = 0;
      variance4x4downsample[i2 + j] = 0;
      if (!is_key_frame) {
        fill_variance_8x8avg(s, sp, d, dp, x16_idx, y16_idx, vst,
#if CONFIG_VP9_HIGHBITDEPTH
                            xd->cur_buf->flags,
#endif
                            pixels_wide,
                            pixels_high,
                            is_key_frame);
        fill_variance_tree(&vt.split[i].split[j], BLOCK_16X16);
        get_variance(&vt.split[i].split[j].part_variances.none);
        if (vt.split[i].split[j].part_variances.none.variance >
            thresholds[2]) {
          // 16X16 variance is above threshold for split, so force split to 8x8
          // for this 16x16 block (this also forces splits for upper levels).
          force_split[split_index] = 1;
          force_split[i + 1] = 1;
          force_split[0] = 1;
        } else if (vt.split[i].split[j].part_variances.none.variance >
                   thresholds[1] &&
                   !cyclic_refresh_segment_id_boosted(segment_id)) {
          // We have some nominal amount of 16x16 variance (based on average),
          // compute the minmax over the 8x8 sub-blocks, and if above threshold,
          // force split to 8x8 block for this 16x16 block.
          int minmax = compute_minmax_8x8(s, sp, d, dp, x16_idx, y16_idx,
#if CONFIG_VP9_HIGHBITDEPTH
                                          xd->cur_buf->flags,
#endif
                                          pixels_wide, pixels_high);
          if (minmax > cpi->vbp_threshold_minmax) {
            force_split[split_index] = 1;
            force_split[i + 1] = 1;
            force_split[0] = 1;
          }
        }
      }
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      if (is_key_frame || (low_res &&
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          vt.split[i].split[j].part_variances.none.variance >
          (thresholds[1] << 1))) {
        force_split[split_index] = 0;
        // Go down to 4x4 down-sampling for variance.
        variance4x4downsample[i2 + j] = 1;
        for (k = 0; k < 4; k++) {
          int x8_idx = x16_idx + ((k & 1) << 3);
          int y8_idx = y16_idx + ((k >> 1) << 3);
          v8x8 *vst2 = is_key_frame ? &vst->split[k] :
              &vt2[i2 + j].split[k];
          fill_variance_4x4avg(s, sp, d, dp, x8_idx, y8_idx, vst2,
#if CONFIG_VP9_HIGHBITDEPTH
                               xd->cur_buf->flags,
#endif
                               pixels_wide,
                               pixels_high,
                               is_key_frame);
        }
      }
    }
  }

  // Fill the rest of the variance tree by summing split partition values.
  for (i = 0; i < 4; i++) {
    const int i2 = i << 2;
    for (j = 0; j < 4; j++) {
      if (variance4x4downsample[i2 + j] == 1) {
        v16x16 *vtemp = (!is_key_frame) ? &vt2[i2 + j] :
            &vt.split[i].split[j];
        for (m = 0; m < 4; m++)
          fill_variance_tree(&vtemp->split[m], BLOCK_8X8);
        fill_variance_tree(vtemp, BLOCK_16X16);
      }
    }
    fill_variance_tree(&vt.split[i], BLOCK_32X32);
    // If variance of this 32x32 block is above the threshold, force the block
    // to split. This also forces a split on the upper (64x64) level.
    if (!force_split[i + 1]) {
      get_variance(&vt.split[i].part_variances.none);
      if (vt.split[i].part_variances.none.variance > thresholds[1]) {
        force_split[i + 1] = 1;
        force_split[0] = 1;
      }
    }
  }
  if (!force_split[0]) {
    fill_variance_tree(&vt, BLOCK_64X64);
    get_variance(&vt.part_variances.none);
  }

  // Now go through the entire structure, splitting every block size until
  // we get to one that's got a variance lower than our threshold.
  if ( mi_col + 8 > cm->mi_cols || mi_row + 8 > cm->mi_rows ||
      !set_vt_partitioning(cpi, x, xd, &vt, BLOCK_64X64, mi_row, mi_col,
                           thresholds[0], BLOCK_16X16, force_split[0])) {
    for (i = 0; i < 4; ++i) {
      const int x32_idx = ((i & 1) << 2);
      const int y32_idx = ((i >> 1) << 2);
      const int i2 = i << 2;
      if (!set_vt_partitioning(cpi, x, xd, &vt.split[i], BLOCK_32X32,
                               (mi_row + y32_idx), (mi_col + x32_idx),
                               thresholds[1], BLOCK_16X16,
                               force_split[i + 1])) {
        for (j = 0; j < 4; ++j) {
          const int x16_idx = ((j & 1) << 1);
          const int y16_idx = ((j >> 1) << 1);
          // For inter frames: if variance4x4downsample[] == 1 for this 16x16
          // block, then the variance is based on 4x4 down-sampling, so use vt2
          // in set_vt_partioning(), otherwise use vt.
          v16x16 *vtemp = (!is_key_frame &&
                           variance4x4downsample[i2 + j] == 1) ?
                           &vt2[i2 + j] : &vt.split[i].split[j];
          if (!set_vt_partitioning(cpi, x, xd, vtemp, BLOCK_16X16,
                                   mi_row + y32_idx + y16_idx,
                                   mi_col + x32_idx + x16_idx,
                                   thresholds[2],
                                   cpi->vbp_bsize_min,
                                   force_split[5 + i2  + j])) {
            for (k = 0; k < 4; ++k) {
              const int x8_idx = (k & 1);
              const int y8_idx = (k >> 1);
              if (use_4x4_partition) {
                if (!set_vt_partitioning(cpi, x, xd, &vtemp->split[k],
                                         BLOCK_8X8,
                                         mi_row + y32_idx + y16_idx + y8_idx,
                                         mi_col + x32_idx + x16_idx + x8_idx,
                                         thresholds[3], BLOCK_8X8, 0)) {
                  set_block_size(cpi, x, xd,
                                 (mi_row + y32_idx + y16_idx + y8_idx),
                                 (mi_col + x32_idx + x16_idx + x8_idx),
                                 BLOCK_4X4);
                }
              } else {
                set_block_size(cpi, x, xd,
                               (mi_row + y32_idx + y16_idx + y8_idx),
                               (mi_col + x32_idx + x16_idx + x8_idx),
                               BLOCK_8X8);
              }
            }
          }
        }
      }
    }
  }
  return 0;
}

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static void update_state(VP10_COMP *cpi, ThreadData *td,
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                         PICK_MODE_CONTEXT *ctx,
                         int mi_row, int mi_col, BLOCK_SIZE bsize,
                         int output_enabled) {
  int i, x_idx, y;
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  VP10_COMMON *const cm = &cpi->common;
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  RD_COUNTS *const rdc = &td->rd_counts;
  MACROBLOCK *const x = &td->mb;
  MACROBLOCKD *const xd = &x->e_mbd;
  struct macroblock_plane *const p = x->plane;
  struct macroblockd_plane *const pd = xd->plane;
  MODE_INFO *mi = &ctx->mic;
  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  MODE_INFO *mi_addr = xd->mi[0];
  const struct segmentation *const seg = &cm->seg;
  const int bw = num_8x8_blocks_wide_lookup[mi->mbmi.sb_type];
  const int bh = num_8x8_blocks_high_lookup[mi->mbmi.sb_type];
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  const int x_mis = VPXMIN(bw, cm->mi_cols - mi_col);
  const int y_mis = VPXMIN(bh, cm->mi_rows - mi_row);
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  MV_REF *const frame_mvs =
      cm->cur_frame->mvs + mi_row * cm->mi_cols + mi_col;
  int w, h;

  const int mis = cm->mi_stride;
  const int mi_width = num_8x8_blocks_wide_lookup[bsize];
  const int mi_height = num_8x8_blocks_high_lookup[bsize];
  int max_plane;

  assert(mi->mbmi.sb_type == bsize);

  *mi_addr = *mi;
  *x->mbmi_ext = ctx->mbmi_ext;

  // If segmentation in use
  if (seg->enabled) {
    // For in frame complexity AQ copy the segment id from the segment map.
    if (cpi->oxcf.aq_mode == COMPLEXITY_AQ) {
      const uint8_t *const map = seg->update_map ? cpi->segmentation_map
                                                 : cm->last_frame_seg_map;
      mi_addr->mbmi.segment_id =
        get_segment_id(cm, map, bsize, mi_row, mi_col);
    }
    // Else for cyclic refresh mode update the segment map, set the segment id
    // and then update the quantizer.
    if (cpi->oxcf.aq_mode == CYCLIC_REFRESH_AQ) {
      vp10_cyclic_refresh_update_segment(cpi, &xd->mi[0]->mbmi, mi_row,
                                        mi_col, bsize, ctx->rate, ctx->dist,
                                        x->skip);
    }
  }

  max_plane = is_inter_block(mbmi) ? MAX_MB_PLANE : 1;
  for (i = 0; i < max_plane; ++i) {
    p[i].coeff = ctx->coeff_pbuf[i][1];
    p[i].qcoeff = ctx->qcoeff_pbuf[i][1];
    pd[i].dqcoeff = ctx->dqcoeff_pbuf[i][1];
    p[i].eobs = ctx->eobs_pbuf[i][1];
  }

  for (i = max_plane; i < MAX_MB_PLANE; ++i) {
    p[i].coeff = ctx->coeff_pbuf[i][2];
    p[i].qcoeff = ctx->qcoeff_pbuf[i][2];
    pd[i].dqcoeff = ctx->dqcoeff_pbuf[i][2];
    p[i].eobs = ctx->eobs_pbuf[i][2];
  }

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  for (i = 0; i < 2; ++i)
    pd[i].color_index_map = ctx->color_index_map[i];

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  // Restore the coding context of the MB to that that was in place
  // when the mode was picked for it
  for (y = 0; y < mi_height; y++)
    for (x_idx = 0; x_idx < mi_width; x_idx++)
      if ((xd->mb_to_right_edge >> (3 + MI_SIZE_LOG2)) + mi_width > x_idx
        && (xd->mb_to_bottom_edge >> (3 + MI_SIZE_LOG2)) + mi_height > y) {
        xd->mi[x_idx + y * mis] = mi_addr;
      }

  if (cpi->oxcf.aq_mode)
    vp10_init_plane_quantizers(cpi, x);

  if (is_inter_block(mbmi) && mbmi->sb_type < BLOCK_8X8) {
    mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
    mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
  }

  x->skip = ctx->skip;
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#if CONFIG_VAR_TX
  for (i = 0; i < MAX_MB_PLANE; ++i)
    memcpy(x->blk_skip[i], ctx->blk_skip[i],
           sizeof(uint8_t) * ctx->num_4x4_blk);
#else
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  memcpy(x->zcoeff_blk[mbmi->tx_size], ctx->zcoeff_blk,
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         sizeof(ctx->zcoeff_blk[0]) * ctx->num_4x4_blk);
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#endif
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  if (!output_enabled)
    return;

#if CONFIG_INTERNAL_STATS
  if (frame_is_intra_only(cm)) {
    static const int kf_mode_index[] = {
      THR_DC        /*DC_PRED*/,
      THR_V_PRED    /*V_PRED*/,
      THR_H_PRED    /*H_PRED*/,
      THR_D45_PRED  /*D45_PRED*/,
      THR_D135_PRED /*D135_PRED*/,
      THR_D117_PRED /*D117_PRED*/,
      THR_D153_PRED /*D153_PRED*/,
      THR_D207_PRED /*D207_PRED*/,
      THR_D63_PRED  /*D63_PRED*/,
      THR_TM        /*TM_PRED*/,
    };
    ++cpi->mode_chosen_counts[kf_mode_index[mbmi->mode]];
  } else {
    // Note how often each mode chosen as best
    ++cpi->mode_chosen_counts[ctx->best_mode_index];
  }
#endif
  if (!frame_is_intra_only(cm)) {
    if (is_inter_block(mbmi)) {
      vp10_update_mv_count(td);

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      if (cm->interp_filter == SWITCHABLE
#if CONFIG_EXT_INTERP
          && vp10_is_interp_needed(xd)
#endif
          ) {
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        const int ctx = vp10_get_pred_context_switchable_interp(xd);
        ++td->counts->switchable_interp[ctx][mbmi->interp_filter];
      }
    }

    rdc->comp_pred_diff[SINGLE_REFERENCE] += ctx->single_pred_diff;
    rdc->comp_pred_diff[COMPOUND_REFERENCE] += ctx->comp_pred_diff;
    rdc->comp_pred_diff[REFERENCE_MODE_SELECT] += ctx->hybrid_pred_diff;

    for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; ++i)
      rdc->filter_diff[i] += ctx->best_filter_diff[i];
  }

  for (h = 0; h < y_mis; ++h) {
    MV_REF *const frame_mv = frame_mvs + h * cm->mi_cols;
    for (w = 0; w < x_mis; ++w) {
      MV_REF *const mv = frame_mv + w;
      mv->ref_frame[0] = mi->mbmi.ref_frame[0];
      mv->ref_frame[1] = mi->mbmi.ref_frame[1];
      mv->mv[0].as_int = mi->mbmi.mv[0].as_int;
      mv->mv[1].as_int = mi->mbmi.mv[1].as_int;
    }
  }
}

void vp10_setup_src_planes(MACROBLOCK *x, const YV12_BUFFER_CONFIG *src,
                          int mi_row, int mi_col) {
  uint8_t *const buffers[3] = {src->y_buffer, src->u_buffer, src->v_buffer };
  const int strides[3] = {src->y_stride, src->uv_stride, src->uv_stride };
  int i;

  // Set current frame pointer.
  x->e_mbd.cur_buf = src;

  for (i = 0; i < MAX_MB_PLANE; i++)
    setup_pred_plane(&x->plane[i].src, buffers[i], strides[i], mi_row, mi_col,
                     NULL, x->e_mbd.plane[i].subsampling_x,
                     x->e_mbd.plane[i].subsampling_y);
}

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static int set_segment_rdmult(VP10_COMP *const cpi,
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                               MACROBLOCK *const x,
                               int8_t segment_id) {
  int segment_qindex;
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  VP10_COMMON *const cm = &cpi->common;
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  vp10_init_plane_quantizers(cpi, x);
  vpx_clear_system_state();
  segment_qindex = vp10_get_qindex(&cm->seg, segment_id,
                                  cm->base_qindex);
  return vp10_compute_rd_mult(cpi, segment_qindex + cm->y_dc_delta_q);
}

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static void rd_pick_sb_modes(VP10_COMP *cpi,
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                             TileDataEnc *tile_data,
                             MACROBLOCK *const x,
                             int mi_row, int mi_col, RD_COST *rd_cost,
                             BLOCK_SIZE bsize, PICK_MODE_CONTEXT *ctx,
                             int64_t best_rd) {
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  VP10_COMMON *const cm = &cpi->common;
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  TileInfo *const tile_info = &tile_data->tile_info;
  MACROBLOCKD *const xd = &x->e_mbd;
  MB_MODE_INFO *mbmi;
  struct macroblock_plane *const p = x->plane;
  struct macroblockd_plane *const pd = xd->plane;
  const AQ_MODE aq_mode = cpi->oxcf.aq_mode;
  int i, orig_rdmult;

  vpx_clear_system_state();

  // Use the lower precision, but faster, 32x32 fdct for mode selection.
  x->use_lp32x32fdct = 1;

  set_offsets(cpi, tile_info, x, mi_row, mi_col, bsize);
  mbmi = &xd->mi[0]->mbmi;
  mbmi->sb_type = bsize;

  for (i = 0; i < MAX_MB_PLANE; ++i) {
    p[i].coeff = ctx->coeff_pbuf[i][0];
    p[i].qcoeff = ctx->qcoeff_pbuf[i][0];
    pd[i].dqcoeff = ctx->dqcoeff_pbuf[i][0];
    p[i].eobs = ctx->eobs_pbuf[i][0];
  }
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  if (cm->current_video_frame == 0 && cm->allow_screen_content_tools) {
    for (i = 0; i < 2; ++i) {
      if (ctx->color_index_map[i] == 0) {
        CHECK_MEM_ERROR(cm, ctx->color_index_map[i],
                        vpx_memalign(16, (ctx->num_4x4_blk << 4) *
                                     sizeof(*ctx->color_index_map[i])));
      }
    }
  }
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  for (i = 0; i < 2; ++i)
    pd[i].color_index_map = ctx->color_index_map[i];

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  ctx->is_coded = 0;
  ctx->skippable = 0;
  ctx->pred_pixel_ready = 0;
  x->skip_recode = 0;

  // Set to zero to make sure we do not use the previous encoded frame stats
  mbmi->skip = 0;

#if CONFIG_VP9_HIGHBITDEPTH
  if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
    x->source_variance =
        vp10_high_get_sby_perpixel_variance(cpi, &x->plane[0].src,
                                           bsize, xd->bd);
  } else {
    x->source_variance =
      vp10_get_sby_perpixel_variance(cpi, &x->plane[0].src, bsize);
  }
#else
  x->source_variance =
    vp10_get_sby_perpixel_variance(cpi, &x->plane[0].src, bsize);
#endif  // CONFIG_VP9_HIGHBITDEPTH

  // Save rdmult before it might be changed, so it can be restored later.
  orig_rdmult = x->rdmult;

  if (aq_mode == VARIANCE_AQ) {
    const int energy = bsize <= BLOCK_16X16 ? x->mb_energy
                                            : vp10_block_energy(cpi, x, bsize);
    if (cm->frame_type == KEY_FRAME ||
        cpi->refresh_alt_ref_frame ||
        (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref)) {
      mbmi->segment_id = vp10_vaq_segment_id(energy);
    } else {
      const uint8_t *const map = cm->seg.update_map ? cpi->segmentation_map
                                                    : cm->last_frame_seg_map;
      mbmi->segment_id = get_segment_id(cm, map, bsize, mi_row, mi_col);
    }
    x->rdmult = set_segment_rdmult(cpi, x, mbmi->segment_id);
  } else if (aq_mode == COMPLEXITY_AQ) {
    x->rdmult = set_segment_rdmult(cpi, x, mbmi->segment_id);
  } else if (aq_mode == CYCLIC_REFRESH_AQ) {
    const uint8_t *const map = cm->seg.update_map ? cpi->segmentation_map
                                                  : cm->last_frame_seg_map;
    // If segment is boosted, use rdmult for that segment.
    if (cyclic_refresh_segment_id_boosted(
            get_segment_id(cm, map, bsize, mi_row, mi_col)))
      x->rdmult = vp10_cyclic_refresh_get_rdmult(cpi->cyclic_refresh);
  }

  // Find best coding mode & reconstruct the MB so it is available
  // as a predictor for MBs that follow in the SB
  if (frame_is_intra_only(cm)) {
    vp10_rd_pick_intra_mode_sb(cpi, x, rd_cost, bsize, ctx, best_rd);
  } else {
    if (bsize >= BLOCK_8X8) {
      if (segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP))
        vp10_rd_pick_inter_mode_sb_seg_skip(cpi, tile_data, x, rd_cost, bsize,
                                           ctx, best_rd);
      else
        vp10_rd_pick_inter_mode_sb(cpi, tile_data, x, mi_row, mi_col,
                                  rd_cost, bsize, ctx, best_rd);
    } else {
      vp10_rd_pick_inter_mode_sub8x8(cpi, tile_data, x, mi_row, mi_col,
                                    rd_cost, bsize, ctx, best_rd);
    }
  }


  // Examine the resulting rate and for AQ mode 2 make a segment choice.
  if ((rd_cost->rate != INT_MAX) &&
      (aq_mode == COMPLEXITY_AQ) && (bsize >= BLOCK_16X16) &&
      (cm->frame_type == KEY_FRAME ||
       cpi->refresh_alt_ref_frame ||
       (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref))) {
    vp10_caq_select_segment(cpi, x, bsize, mi_row, mi_col, rd_cost->rate);
  }

  x->rdmult = orig_rdmult;

  // TODO(jingning) The rate-distortion optimization flow needs to be
  // refactored to provide proper exit/return handle.
  if (rd_cost->rate == INT_MAX)
    rd_cost->rdcost = INT64_MAX;

  ctx->rate = rd_cost->rate;
  ctx->dist = rd_cost->dist;
}

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static void update_stats(VP10_COMMON *cm, ThreadData *td) {
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  const MACROBLOCK *x = &td->mb;
  const MACROBLOCKD *const xd = &x->e_mbd;
  const MODE_INFO *const mi = xd->mi[0];
  const MB_MODE_INFO *const mbmi = &mi->mbmi;
  const MB_MODE_INFO_EXT *const mbmi_ext = x->mbmi_ext;
  const BLOCK_SIZE bsize = mbmi->sb_type;

  if (!frame_is_intra_only(cm)) {
    FRAME_COUNTS *const counts = td->counts;
    const int inter_block = is_inter_block(mbmi);
    const int seg_ref_active = segfeature_active(&cm->seg, mbmi->segment_id,
                                                 SEG_LVL_REF_FRAME);
    if (!seg_ref_active) {
      counts->intra_inter[vp10_get_intra_inter_context(xd)][inter_block]++;
      // If the segment reference feature is enabled we have only a single
      // reference frame allowed for the segment so exclude it from
      // the reference frame counts used to work out probabilities.
      if (inter_block) {
        const MV_REFERENCE_FRAME ref0 = mbmi->ref_frame[0];
        if (cm->reference_mode == REFERENCE_MODE_SELECT)
          counts->comp_inter[vp10_get_reference_mode_context(cm, xd)]
                            [has_second_ref(mbmi)]++;

        if (has_second_ref(mbmi)) {
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#if CONFIG_EXT_REFS
          const int bit = (ref0 == GOLDEN_FRAME || ref0 == LAST3_FRAME ||
                           ref0 == LAST4_FRAME);
          counts->comp_ref[vp10_get_pred_context_comp_ref_p(cm, xd)][0][bit]++;
          if (!bit) {
            counts->comp_ref[vp10_get_pred_context_comp_ref_p1(cm, xd)][1]
                            [ref0 == LAST_FRAME]++;
          } else {
            counts->comp_ref[vp10_get_pred_context_comp_ref_p2(cm, xd)][2]
                            [ref0 == GOLDEN_FRAME]++;
            if (ref0 != GOLDEN_FRAME) {
              counts->comp_ref[vp10_get_pred_context_comp_ref_p3(cm, xd)][3]
                              [ref0 == LAST3_FRAME]++;
            }
          }
#else
          counts->comp_ref[vp10_get_pred_context_comp_ref_p(cm, xd)][0]
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                          [ref0 == GOLDEN_FRAME]++;
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#endif  // CONFIG_EXT_REFS
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        } else {
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#if CONFIG_EXT_REFS
          const int bit = (ref0 == ALTREF_FRAME || ref0 == GOLDEN_FRAME);
          counts->single_ref[vp10_get_pred_context_single_ref_p1(xd)][0][bit]++;
          if (bit) {
            counts->single_ref[vp10_get_pred_context_single_ref_p2(xd)][1]
                              [ref0 != GOLDEN_FRAME]++;
          } else {
            const int bit1 = !(ref0 == LAST2_FRAME || ref0 == LAST_FRAME);
            counts->single_ref[vp10_get_pred_context_single_ref_p3(xd)][2]
                              [bit1]++;
            if (!bit1) {
              counts->single_ref[vp10_get_pred_context_single_ref_p4(xd)][3]
                                [ref0 != LAST_FRAME]++;
            } else {
              counts->single_ref[vp10_get_pred_context_single_ref_p5(xd)][4]
                                [ref0 != LAST3_FRAME]++;
            }
          }
#else
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          counts->single_ref[vp10_get_pred_context_single_ref_p1(xd)][0]
                            [ref0 != LAST_FRAME]++;
          if (ref0 != LAST_FRAME)
            counts->single_ref[vp10_get_pred_context_single_ref_p2(xd)][1]
                              [ref0 != GOLDEN_FRAME]++;
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#endif  // CONFIG_EXT_REFS
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        }
      }
    }
    if (inter_block &&
        !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
      const int mode_ctx = mbmi_ext->mode_context[mbmi->ref_frame[0]];
      if (bsize >= BLOCK_8X8) {
        const PREDICTION_MODE mode = mbmi->mode;
        ++counts->inter_mode[mode_ctx][INTER_OFFSET(mode)];
      } else {
        const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
        const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
        int idx, idy;
        for (idy = 0; idy < 2; idy += num_4x4_h) {
          for (idx = 0; idx < 2; idx += num_4x4_w) {
            const int j = idy * 2 + idx;
            const PREDICTION_MODE b_mode = mi->bmi[j].as_mode;
            ++counts->inter_mode[mode_ctx][INTER_OFFSET(b_mode)];
          }
        }
      }
    }
  }
}

static void restore_context(MACROBLOCK *const x, int mi_row, int mi_col,
                            ENTROPY_CONTEXT a[16 * MAX_MB_PLANE],
                            ENTROPY_CONTEXT l[16 * MAX_MB_PLANE],
                            PARTITION_CONTEXT sa[8], PARTITION_CONTEXT sl[8],
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#if CONFIG_VAR_TX
                            TXFM_CONTEXT ta[8], TXFM_CONTEXT tl[8],
#endif
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                            BLOCK_SIZE bsize) {
  MACROBLOCKD *const xd = &x->e_mbd;
  int p;
  const int num_4x4_blocks_wide = num_4x4_blocks_wide_lookup[bsize];
  const int num_4x4_blocks_high = num_4x4_blocks_high_lookup[bsize];
  int mi_width = num_8x8_blocks_wide_lookup[bsize];
  int mi_height = num_8x8_blocks_high_lookup[bsize];
  for (p = 0; p < MAX_MB_PLANE; p++) {
    memcpy(
        xd->above_context[p] + ((mi_col * 2) >> xd->plane[p].subsampling_x),
        a + num_4x4_blocks_wide * p,
        (sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_wide) >>
        xd->plane[p].subsampling_x);
    memcpy(
        xd->left_context[p]
            + ((mi_row & MI_MASK) * 2 >> xd->plane[p].subsampling_y),
        l + num_4x4_blocks_high * p,
        (sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_high) >>
        xd->plane[p].subsampling_y);
  }
  memcpy(xd->above_seg_context + mi_col, sa,
         sizeof(*xd->above_seg_context) * mi_width);
  memcpy(xd->left_seg_context + (mi_row & MI_MASK), sl,
         sizeof(xd->left_seg_context[0]) * mi_height);
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#if CONFIG_VAR_TX
  memcpy(xd->above_txfm_context, ta,
         sizeof(*xd->above_txfm_context) * mi_width);
  memcpy(xd->left_txfm_context, tl,
         sizeof(*xd->left_txfm_context) * mi_height);
#endif
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}

static void save_context(MACROBLOCK *const x, int mi_row, int mi_col,
                         ENTROPY_CONTEXT a[16 * MAX_MB_PLANE],
                         ENTROPY_CONTEXT l[16 * MAX_MB_PLANE],
                         PARTITION_CONTEXT sa[8], PARTITION_CONTEXT sl[8],
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#if CONFIG_VAR_TX
                         TXFM_CONTEXT ta[8], TXFM_CONTEXT tl[8],
#endif
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                         BLOCK_SIZE bsize) {
  const MACROBLOCKD *const xd = &x->e_mbd;
  int p;
  const int num_4x4_blocks_wide = num_4x4_blocks_wide_lookup[bsize];
  const int num_4x4_blocks_high = num_4x4_blocks_high_lookup[bsize];
  int mi_width = num_8x8_blocks_wide_lookup[bsize];
  int mi_height = num_8x8_blocks_high_lookup[bsize];

  // buffer the above/left context information of the block in search.
  for (p = 0; p < MAX_MB_PLANE; ++p) {
    memcpy(
        a + num_4x4_blocks_wide * p,
        xd->above_context[p] + (mi_col * 2 >> xd->plane[p].subsampling_x),
        (sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_wide) >>
        xd->plane[p].subsampling_x);
    memcpy(
        l + num_4x4_blocks_high * p,
        xd->left_context[p]
            + ((mi_row & MI_MASK) * 2 >> xd->plane[p].subsampling_y),
        (sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_high) >>
        xd->plane[p].subsampling_y);
  }
  memcpy(sa, xd->above_seg_context + mi_col,
         sizeof(*xd->above_seg_context) * mi_width);
  memcpy(sl, xd->left_seg_context + (mi_row & MI_MASK),
         sizeof(xd->left_seg_context[0]) * mi_height);
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#if CONFIG_VAR_TX
  memcpy(ta, xd->above_txfm_context,
         sizeof(*xd->above_txfm_context) * mi_width);
  memcpy(tl, xd->left_txfm_context,
         sizeof(*xd->left_txfm_context) * mi_height);
#endif
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}

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static void encode_b(VP10_COMP *cpi, const TileInfo *const tile,
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                     ThreadData *td,
                     TOKENEXTRA **tp, int mi_row, int mi_col,
                     int output_enabled, BLOCK_SIZE bsize,
                     PICK_MODE_CONTEXT *ctx) {
  MACROBLOCK *const x = &td->mb;
  set_offsets(cpi, tile, x, mi_row, mi_col, bsize);
  update_state(cpi, td, ctx, mi_row, mi_col, bsize, output_enabled);
  encode_superblock(cpi, td, tp, output_enabled, mi_row, mi_col, bsize, ctx);

  if (output_enabled) {
    update_stats(&cpi->common, td);
  }
}

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static void encode_sb(VP10_COMP *cpi, ThreadData *td,
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                      const TileInfo *const tile,
                      TOKENEXTRA **tp, int mi_row, int mi_col,
                      int output_enabled, BLOCK_SIZE bsize,
                      PC_TREE *pc_tree) {
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  VP10_COMMON *const cm = &cpi->common;
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  MACROBLOCK *const x = &td->mb;
  MACROBLOCKD *const xd = &x->e_mbd;

  const int bsl = b_width_log2_lookup[bsize], hbs = (1 << bsl) / 4;
  int ctx;
  PARTITION_TYPE partition;
  BLOCK_SIZE subsize = bsize;

  if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
    return;

  if (bsize >= BLOCK_8X8) {
    ctx = partition_plane_context(xd, mi_row, mi_col, bsize);
    subsize = get_subsize(bsize, pc_tree->partitioning);
  } else {
    ctx = 0;
    subsize = BLOCK_4X4;
  }

  partition = partition_lookup[bsl][subsize];
  if (output_enabled && bsize != BLOCK_4X4)
    td->counts->partition[ctx][partition]++;

  switch (partition) {
    case PARTITION_NONE:
      encode_b(cpi, tile, td, tp, mi_row, mi_col, output_enabled, subsize,
               &pc_tree->none);
      break;
    case PARTITION_VERT:
      encode_b(cpi, tile, td, tp, mi_row, mi_col, output_enabled, subsize,
               &pc_tree->vertical[0]);
      if (mi_col + hbs < cm->mi_cols && bsize > BLOCK_8X8) {
        encode_b(cpi, tile, td, tp, mi_row, mi_col + hbs, output_enabled,
                 subsize, &pc_tree->vertical[1]);
      }
      break;
    case PARTITION_HORZ:
      encode_b(cpi, tile, td, tp, mi_row, mi_col, output_enabled, subsize,
               &pc_tree->horizontal[0]);
      if (mi_row + hbs < cm->mi_rows && bsize > BLOCK_8X8) {
        encode_b(cpi, tile, td, tp, mi_row + hbs, mi_col, output_enabled,
                 subsize, &pc_tree->horizontal[1]);
      }
      break;
    case PARTITION_SPLIT:
      if (bsize == BLOCK_8X8) {
        encode_b(cpi, tile, td, tp, mi_row, mi_col, output_enabled, subsize,
                 pc_tree->leaf_split[0]);
      } else {
        encode_sb(cpi, td, tile, tp, mi_row, mi_col, output_enabled, subsize,
                  pc_tree->split[0]);
        encode_sb(cpi, td, tile, tp, mi_row, mi_col + hbs, output_enabled,
                  subsize, pc_tree->split[1]);
        encode_sb(cpi, td, tile, tp, mi_row + hbs, mi_col, output_enabled,
                  subsize, pc_tree->split[2]);
        encode_sb(cpi, td, tile, tp, mi_row + hbs, mi_col + hbs, output_enabled,
                  subsize, pc_tree->split[3]);
      }
      break;
    default:
      assert(0 && "Invalid partition type.");
      break;
  }

  if (partition != PARTITION_SPLIT || bsize == BLOCK_8X8)
    update_partition_context(xd, mi_row, mi_col, subsize, bsize);
}

// Check to see if the given partition size is allowed for a specified number
// of 8x8 block rows and columns remaining in the image.
// If not then return the largest allowed partition size
static BLOCK_SIZE find_partition_size(BLOCK_SIZE bsize,
                                      int rows_left, int cols_left,
                                      int *bh, int *bw) {
  if (rows_left <= 0 || cols_left <= 0) {
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    return VPXMIN(bsize, BLOCK_8X8);
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  } else {
    for (; bsize > 0; bsize -= 3) {
      *bh = num_8x8_blocks_high_lookup[bsize];
      *bw = num_8x8_blocks_wide_lookup[bsize];
      if ((*bh <= rows_left) && (*bw <= cols_left)) {
        break;
      }
    }
  }
  return bsize;
}

static void set_partial_b64x64_partition(MODE_INFO *mi, int mis,
    int bh_in, int bw_in, int row8x8_remaining, int col8x8_remaining,
    BLOCK_SIZE bsize, MODE_INFO **mi_8x8) {
  int bh = bh_in;
  int r, c;
  for (r = 0; r < MI_BLOCK_SIZE; r += bh) {
    int bw = bw_in;
    for (c = 0; c < MI_BLOCK_SIZE; c += bw) {
      const int index = r * mis + c;
      mi_8x8[index] = mi + index;
      mi_8x8[index]->mbmi.sb_type = find_partition_size(bsize,
          row8x8_remaining - r, col8x8_remaining - c, &bh, &bw);
    }
  }
}

// This function attempts to set all mode info entries in a given SB64
// to the same block partition size.
// However, at the bottom and right borders of the image the requested size
// may not be allowed in which case this code attempts to choose the largest
// allowable partition.
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static void set_fixed_partitioning(VP10_COMP *cpi, const TileInfo *const tile,
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                                   MODE_INFO **mi_8x8, int mi_row, int mi_col,
                                   BLOCK_SIZE bsize) {
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  VP10_COMMON *const cm = &cpi->common;
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  const int mis = cm->mi_stride;
  const int row8x8_remaining = tile->mi_row_end - mi_row;
  const int col8x8_remaining = tile->mi_col_end - mi_col;
  int block_row, block_col;
  MODE_INFO *mi_upper_left = cm->mi + mi_row * mis + mi_col;
  int bh = num_8x8_blocks_high_lookup[bsize];
  int bw = num_8x8_blocks_wide_lookup[bsize];

  assert((row8x8_remaining > 0) && (col8x8_remaining > 0));

  // Apply the requested partition size to the SB64 if it is all "in image"
  if ((col8x8_remaining >= MI_BLOCK_SIZE) &&
      (row8x8_remaining >= MI_BLOCK_SIZE)) {
    for (block_row = 0; block_row < MI_BLOCK_SIZE; block_row += bh) {
      for (block_col = 0; block_col < MI_BLOCK_SIZE; block_col += bw) {
        int index = block_row * mis + block_col;
        mi_8x8[index] = mi_upper_left + index;
        mi_8x8[index]->mbmi.sb_type = bsize;
      }
    }
  } else {
    // Else this is a partial SB64.
    set_partial_b64x64_partition(mi_upper_left, mis, bh, bw, row8x8_remaining,
        col8x8_remaining, bsize, mi_8x8);
  }
}

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static void rd_use_partition(VP10_COMP *cpi,
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                             ThreadData *td,
                             TileDataEnc *tile_data,
                             MODE_INFO **mi_8x8, TOKENEXTRA **tp,
                             int mi_row, int mi_col,
                             BLOCK_SIZE bsize,
                             int *rate, int64_t *dist,
                             int do_recon, PC_TREE *pc_tree) {
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  VP10_COMMON *const cm = &cpi->common;
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  TileInfo *const tile_info = &tile_data->tile_info;
  MACROBLOCK *const x = &td->mb;
  MACROBLOCKD *const xd = &x->e_mbd;
  const int mis = cm->mi_stride;
  const int bsl = b_width_log2_lookup[bsize];
  const int mi_step = num_4x4_blocks_wide_lookup[bsize] / 2;
  const int bss = (1 << bsl) / 4;
  int i, pl;
  PARTITION_TYPE partition = PARTITION_NONE;
  BLOCK_SIZE subsize;
  ENTROPY_CONTEXT l[16 * MAX_MB_PLANE], a[16 * MAX_MB_PLANE];
  PARTITION_CONTEXT sl[8], sa[8];
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#if CONFIG_VAR_TX
  TXFM_CONTEXT tl[8], ta[8];
#endif
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  RD_COST last_part_rdc, none_rdc, chosen_rdc;
  BLOCK_SIZE sub_subsize = BLOCK_4X4;
  int splits_below = 0;
  BLOCK_SIZE bs_type = mi_8x8[0]->mbmi.sb_type;
  int do_partition_search = 1;
  PICK_MODE_CONTEXT *ctx = &pc_tree->none;

  if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols)
    return;

  assert(num_4x4_blocks_wide_lookup[bsize] ==
         num_4x4_blocks_high_lookup[bsize]);

  vp10_rd_cost_reset(&last_part_rdc);
  vp10_rd_cost_reset(&none_rdc);
  vp10_rd_cost_reset(&chosen_rdc);

  partition = partition_lookup[bsl][bs_type];
  subsize = get_subsize(bsize, partition);

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#if CONFIG_VAR_TX
  xd->above_txfm_context = cm->above_txfm_context + mi_col;
  xd->left_txfm_context = xd->left_txfm_context_buffer + (mi_row & 0x07);
#endif
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  pc_tree->partitioning = partition;
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  save_context(x, mi_row, mi_col, a, l, sa, sl,
#if CONFIG_VAR_TX
               ta, tl,
#endif
               bsize);
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  if (bsize == BLOCK_16X16 && cpi->oxcf.aq_mode) {
    set_offsets(cpi, tile_info, x, mi_row, mi_col, bsize);
    x->mb_energy = vp10_block_energy(cpi, x, bsize);
  }

  if (do_partition_search &&
      cpi->sf.partition_search_type == SEARCH_PARTITION &&
      cpi->sf.adjust_partitioning_from_last_frame) {
    // Check if any of the sub blocks are further split.
    if (partition == PARTITION_SPLIT && subsize > BLOCK_8X8) {
      sub_subsize = get_subsize(subsize, PARTITION_SPLIT);
      splits_below = 1;
      for (i = 0; i < 4; i++) {
        int jj = i >> 1, ii = i & 0x01;
        MODE_INFO *this_mi = mi_8x8[jj * bss * mis + ii * bss];
        if (this_mi && this_mi->mbmi.sb_type >= sub_subsize) {
          splits_below = 0;
        }
      }
    }

    // If partition is not none try none unless each of the 4 splits are split
    // even further..
    if (partition != PARTITION_NONE && !splits_below &&
        mi_row + (mi_step >> 1) < cm->mi_rows &&
        mi_col + (mi_step >> 1) < cm->mi_cols) {
      pc_tree->partitioning = PARTITION_NONE;
      rd_pick_sb_modes(cpi, tile_data, x, mi_row, mi_col, &none_rdc, bsize,
                       ctx, INT64_MAX);

      pl = partition_plane_context(xd, mi_row, mi_col, bsize);

      if (none_rdc.rate < INT_MAX) {
        none_rdc.rate += cpi->partition_cost[pl][PARTITION_NONE];
        none_rdc.rdcost = RDCOST(x->rdmult, x->rddiv, none_rdc.rate,
                                 none_rdc.dist);
      }

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      restore_context(x, mi_row, mi_col, a, l, sa, sl,
#if CONFIG_VAR_TX
                      ta, tl,
#endif
                      bsize);
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      mi_8x8[0]->mbmi.sb_type = bs_type;
      pc_tree->partitioning = partition;
    }
  }

  switch (partition) {
    case PARTITION_NONE:
      rd_pick_sb_modes(cpi, tile_data, x, mi_row, mi_col, &last_part_rdc,
                       bsize, ctx, INT64_MAX);
      break;
    case PARTITION_HORZ:
      rd_pick_sb_modes(cpi, tile_data, x, mi_row, mi_col, &last_part_rdc,
                       subsize, &pc_tree->horizontal[0],
                       INT64_MAX);
      if (last_part_rdc.rate != INT_MAX &&
          bsize >= BLOCK_8X8 && mi_row + (mi_step >> 1) < cm->mi_rows) {
        RD_COST tmp_rdc;
        PICK_MODE_CONTEXT *ctx = &pc_tree->horizontal[0];
        vp10_rd_cost_init(&tmp_rdc);
        update_state(cpi, td, ctx, mi_row, mi_col, subsize, 0);
        encode_superblock(cpi, td, tp, 0, mi_row, mi_col, subsize, ctx);
        rd_pick_sb_modes(cpi, tile_data, x,
                         mi_row + (mi_step >> 1), mi_col, &tmp_rdc,
                         subsize, &pc_tree->horizontal[1], INT64_MAX);
        if (tmp_rdc.rate == INT_MAX || tmp_rdc.dist == INT64_MAX) {
          vp10_rd_cost_reset(&last_part_rdc);
          break;
        }
        last_part_rdc.rate += tmp_rdc.rate;
        last_part_rdc.dist += tmp_rdc.dist;
        last_part_rdc.rdcost += tmp_rdc.rdcost;
      }
      break;
    case PARTITION_VERT:
      rd_pick_sb_modes(cpi, tile_data, x, mi_row, mi_col, &last_part_rdc,
                       subsize, &pc_tree->vertical[0], INT64_MAX);
      if (last_part_rdc.rate != INT_MAX &&
          bsize >= BLOCK_8X8 && mi_col + (mi_step >> 1) < cm->mi_cols) {
        RD_COST tmp_rdc;
        PICK_MODE_CONTEXT *ctx = &pc_tree->vertical[0];
        vp10_rd_cost_init(&tmp_rdc);
        update_state(cpi, td, ctx, mi_row, mi_col, subsize, 0);
        encode_superblock(cpi, td, tp, 0, mi_row, mi_col, subsize, ctx);
        rd_pick_sb_modes(cpi, tile_data, x,
                         mi_row, mi_col + (mi_step >> 1), &tmp_rdc,
                         subsize, &pc_tree->vertical[bsize > BLOCK_8X8],
                         INT64_MAX);
        if (tmp_rdc.rate == INT_MAX || tmp_rdc.dist == INT64_MAX) {
          vp10_rd_cost_reset(&last_part_rdc);
          break;
        }
        last_part_rdc.rate += tmp_rdc.rate;
        last_part_rdc.dist += tmp_rdc.dist;
        last_part_rdc.rdcost += tmp_rdc.rdcost;
      }
      break;
    case PARTITION_SPLIT:
      if (bsize == BLOCK_8X8) {
        rd_pick_sb_modes(cpi, tile_data, x, mi_row, mi_col, &last_part_rdc,
                         subsize, pc_tree->leaf_split[0], INT64_MAX);
        break;
      }
      last_part_rdc.rate = 0;
      last_part_rdc.dist = 0;
      last_part_rdc.rdcost = 0;
      for (i = 0; i < 4; i++) {
        int x_idx = (i & 1) * (mi_step >> 1);
        int y_idx = (i >> 1) * (mi_step >> 1);
        int jj = i >> 1, ii = i & 0x01;
        RD_COST tmp_rdc;
        if ((mi_row + y_idx >= cm->mi_rows) || (mi_col + x_idx >= cm->mi_cols))
          continue;

        vp10_rd_cost_init(&tmp_rdc);
        rd_use_partition(cpi, td, tile_data,
                         mi_8x8 + jj * bss * mis + ii * bss, tp,
                         mi_row + y_idx, mi_col + x_idx, subsize,
                         &tmp_rdc.rate, &tmp_rdc.dist,
                         i != 3, pc_tree->split[i]);
        if (tmp_rdc.rate == INT_MAX || tmp_rdc.dist == INT64_MAX) {
          vp10_rd_cost_reset(&last_part_rdc);
          break;
        }
        last_part_rdc.rate += tmp_rdc.rate;
        last_part_rdc.dist += tmp_rdc.dist;
      }
      break;
    default:
      assert(0);
      break;
  }

  pl = partition_plane_context(xd, mi_row, mi_col, bsize);
  if (last_part_rdc.rate < INT_MAX) {
    last_part_rdc.rate += cpi->partition_cost[pl][partition];
    last_part_rdc.rdcost = RDCOST(x->rdmult, x->rddiv,
                                  last_part_rdc.rate, last_part_rdc.dist);
  }

  if (do_partition_search
      && cpi->sf.adjust_partitioning_from_last_frame
      && cpi->sf.partition_search_type == SEARCH_PARTITION
      && partition != PARTITION_SPLIT && bsize > BLOCK_8X8
      && (mi_row + mi_step < cm->mi_rows ||
          mi_row + (mi_step >> 1) == cm->mi_rows)
      && (mi_col + mi_step < cm->mi_cols ||
          mi_col + (mi_step >> 1) == cm->mi_cols)) {
    BLOCK_SIZE split_subsize = get_subsize(bsize, PARTITION_SPLIT);
    chosen_rdc.rate = 0;
    chosen_rdc.dist = 0;
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    restore_context(x, mi_row, mi_col, a, l, sa, sl,
#if CONFIG_VAR_TX
                    ta, tl,
#endif
                    bsize);
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    pc_tree->partitioning = PARTITION_SPLIT;

    // Split partition.
    for (i = 0; i < 4; i++) {
      int x_idx = (i & 1) * (mi_step >> 1);
      int y_idx = (i >> 1) * (mi_step >> 1);
      RD_COST tmp_rdc;
      ENTROPY_CONTEXT l[16 * MAX_MB_PLANE], a[16 * MAX_MB_PLANE];
      PARTITION_CONTEXT sl[8], sa[8];
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#if CONFIG_VAR_TX
      TXFM_CONTEXT tl[8], ta[8];
#endif
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      if ((mi_row + y_idx >= cm->mi_rows) || (mi_col + x_idx >= cm->mi_cols))
        continue;

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      save_context(x, mi_row, mi_col, a, l, sa, sl,
#if CONFIG_VAR_TX
                   ta, tl,
#endif
                   bsize);
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      pc_tree->split[i]->partitioning = PARTITION_NONE;
      rd_pick_sb_modes(cpi, tile_data, x,
                       mi_row + y_idx, mi_col + x_idx, &tmp_rdc,
                       split_subsize, &pc_tree->split[i]->none, INT64_MAX);

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      restore_context(x, mi_row, mi_col, a, l, sa, sl,
#if CONFIG_VAR_TX
                      ta, tl,
#endif
                      bsize);
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      if (tmp_rdc.rate == INT_MAX || tmp_rdc.dist == INT64_MAX) {
        vp10_rd_cost_reset(&chosen_rdc);
        break;
      }

      chosen_rdc.rate += tmp_rdc.rate;
      chosen_rdc.dist += tmp_rdc.dist;

      if (i != 3)
        encode_sb(cpi, td, tile_info, tp,  mi_row + y_idx, mi_col + x_idx, 0,
                  split_subsize, pc_tree->split[i]);

      pl = partition_plane_context(xd, mi_row + y_idx, mi_col + x_idx,
                                   split_subsize);
      chosen_rdc.rate += cpi->partition_cost[pl][PARTITION_NONE];
    }
    pl = partition_plane_context(xd, mi_row, mi_col, bsize);
    if (chosen_rdc.rate < INT_MAX) {
      chosen_rdc.rate += cpi->partition_cost[pl][PARTITION_SPLIT];
      chosen_rdc.rdcost = RDCOST(x->rdmult, x->rddiv,
                                 chosen_rdc.rate, chosen_rdc.dist);
    }
  }

  // If last_part is better set the partitioning to that.
  if (last_part_rdc.rdcost < chosen_rdc.rdcost) {
    mi_8x8[0]->mbmi.sb_type = bsize;
    if (bsize >= BLOCK_8X8)
      pc_tree->partitioning = partition;
    chosen_rdc = last_part_rdc;
  }
  // If none was better set the partitioning to that.
  if (none_rdc.rdcost < chosen_rdc.rdcost) {
    if (bsize >= BLOCK_8X8)
      pc_tree->partitioning = PARTITION_NONE;
    chosen_rdc = none_rdc;
  }

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#if CONFIG_VAR_TX
  xd->above_txfm_context = cm->above_txfm_context + mi_col;
  xd->left_txfm_context = xd->left_txfm_context_buffer + (mi_row & 0x07);
#endif
  restore_context(x, mi_row, mi_col, a, l, sa, sl,
#if CONFIG_VAR_TX
                  ta, tl,
#endif
                  bsize);
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  // We must have chosen a partitioning and encoding or we'll fail later on.
  // No other opportunities for success.
  if (bsize == BLOCK_64X64)
    assert(chosen_rdc.rate < INT_MAX && chosen_rdc.dist < INT64_MAX);

  if (do_recon) {
    int output_enabled = (bsize == BLOCK_64X64);
    encode_sb(cpi, td, tile_info, tp, mi_row, mi_col, output_enabled, bsize,
              pc_tree);
  }

  *rate = chosen_rdc.rate;
  *dist = chosen_rdc.dist;
}

static const BLOCK_SIZE min_partition_size[BLOCK_SIZES] = {
  BLOCK_4X4,   BLOCK_4X4,   BLOCK_4X4,
  BLOCK_4X4,   BLOCK_4X4,   BLOCK_4X4,
  BLOCK_8X8,   BLOCK_8X8,   BLOCK_8X8,
  BLOCK_16X16, BLOCK_16X16, BLOCK_16X16,
  BLOCK_16X16
};

static const BLOCK_SIZE max_partition_size[BLOCK_SIZES] = {
  BLOCK_8X8,   BLOCK_16X16, BLOCK_16X16,
  BLOCK_16X16, BLOCK_32X32, BLOCK_32X32,
  BLOCK_32X32, BLOCK_64X64, BLOCK_64X64,
  BLOCK_64X64, BLOCK_64X64, BLOCK_64X64,
  BLOCK_64X64
};


// Look at all the mode_info entries for blocks that are part of this
// partition and find the min and max values for sb_type.
// At the moment this is designed to work on a 64x64 SB but could be
// adjusted to use a size parameter.
//
// The min and max are assumed to have been initialized prior to calling this
// function so repeat calls can accumulate a min and max of more than one sb64.
static void get_sb_partition_size_range(MACROBLOCKD *xd, MODE_INFO **mi_8x8,
                                        BLOCK_SIZE *min_block_size,
                                        BLOCK_SIZE *max_block_size,
                                        int bs_hist[BLOCK_SIZES]) {
  int sb_width_in_blocks = MI_BLOCK_SIZE;
  int sb_height_in_blocks  = MI_BLOCK_SIZE;
  int i, j;
  int index = 0;

  // Check the sb_type for each block that belongs to this region.
  for (i = 0; i < sb_height_in_blocks; ++i) {
    for (j = 0; j < sb_width_in_blocks; ++j) {
      MODE_INFO *mi = mi_8x8[index+j];
      BLOCK_SIZE sb_type = mi ? mi->mbmi.sb_type : 0;
      bs_hist[sb_type]++;
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      *min_block_size = VPXMIN(*min_block_size, sb_type);
      *max_block_size = VPXMAX(*max_block_size, sb_type);