encodeframe.c 181 KB
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/*
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 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
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 *
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 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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 */

#include <limits.h>
#include <math.h>
#include <stdio.h>

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#include "./av1_rtcd.h"
#include "./aom_dsp_rtcd.h"
#include "./aom_config.h"
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#include "aom_dsp/aom_dsp_common.h"
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#include "aom_dsp/binary_codes_writer.h"
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#include "aom_ports/mem.h"
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#include "aom_ports/aom_timer.h"
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#include "aom_ports/system_state.h"
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#include "av1/common/common.h"
#include "av1/common/entropy.h"
#include "av1/common/entropymode.h"
#include "av1/common/idct.h"
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#include "av1/common/mv.h"
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#include "av1/common/mvref_common.h"
#include "av1/common/pred_common.h"
#include "av1/common/quant_common.h"
#include "av1/common/reconintra.h"
#include "av1/common/reconinter.h"
#include "av1/common/seg_common.h"
#include "av1/common/tile_common.h"
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#include "av1/encoder/aq_complexity.h"
#include "av1/encoder/aq_cyclicrefresh.h"
#include "av1/encoder/aq_variance.h"
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#include "av1/common/warped_motion.h"
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#include "av1/encoder/global_motion.h"
#include "av1/encoder/encodeframe.h"
#include "av1/encoder/encodemb.h"
#include "av1/encoder/encodemv.h"
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#if CONFIG_LV_MAP
#include "av1/encoder/encodetxb.h"
#endif
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#include "av1/encoder/ethread.h"
#include "av1/encoder/extend.h"
#include "av1/encoder/rd.h"
#include "av1/encoder/rdopt.h"
#include "av1/encoder/segmentation.h"
#include "av1/encoder/tokenize.h"
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#if CONFIG_HIGHBITDEPTH
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#define IF_HBD(...) __VA_ARGS__
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#else
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#define IF_HBD(...)
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#endif  // CONFIG_HIGHBITDEPTH
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static void encode_superblock(const AV1_COMP *const cpi, ThreadData *td,
                              TOKENEXTRA **t, RUN_TYPE dry_run, int mi_row,
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                              int mi_col, BLOCK_SIZE bsize, int *rate);
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// 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.
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static const uint8_t AV1_VAR_OFFS[MAX_SB_SIZE] = {
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  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,
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#if CONFIG_EXT_PARTITION
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  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
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#endif  // CONFIG_EXT_PARTITION
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};

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#if CONFIG_HIGHBITDEPTH
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static const uint16_t AV1_HIGH_VAR_OFFS_8[MAX_SB_SIZE] = {
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  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,
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#if CONFIG_EXT_PARTITION
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  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
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#endif  // CONFIG_EXT_PARTITION
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};

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static const uint16_t AV1_HIGH_VAR_OFFS_10[MAX_SB_SIZE] = {
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  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,
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#if CONFIG_EXT_PARTITION
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  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
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#endif  // CONFIG_EXT_PARTITION
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};

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static const uint16_t AV1_HIGH_VAR_OFFS_12[MAX_SB_SIZE] = {
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  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,
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#if CONFIG_EXT_PARTITION
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  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
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#endif  // CONFIG_EXT_PARTITION
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};
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#endif  // CONFIG_HIGHBITDEPTH
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unsigned int av1_get_sby_perpixel_variance(const AV1_COMP *cpi,
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                                           const struct buf_2d *ref,
                                           BLOCK_SIZE bs) {
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  unsigned int sse;
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  const unsigned int var =
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      cpi->fn_ptr[bs].vf(ref->buf, ref->stride, AV1_VAR_OFFS, 0, &sse);
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  return ROUND_POWER_OF_TWO(var, num_pels_log2_lookup[bs]);
}

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#if CONFIG_HIGHBITDEPTH
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unsigned int av1_high_get_sby_perpixel_variance(const AV1_COMP *cpi,
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                                                const struct buf_2d *ref,
                                                BLOCK_SIZE bs, int bd) {
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  unsigned int var, sse;
  switch (bd) {
    case 10:
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      var =
          cpi->fn_ptr[bs].vf(ref->buf, ref->stride,
                             CONVERT_TO_BYTEPTR(AV1_HIGH_VAR_OFFS_10), 0, &sse);
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      break;
    case 12:
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      var =
          cpi->fn_ptr[bs].vf(ref->buf, ref->stride,
                             CONVERT_TO_BYTEPTR(AV1_HIGH_VAR_OFFS_12), 0, &sse);
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      break;
    case 8:
    default:
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      var =
          cpi->fn_ptr[bs].vf(ref->buf, ref->stride,
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                             CONVERT_TO_BYTEPTR(AV1_HIGH_VAR_OFFS_8), 0, &sse);
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      break;
  }
  return ROUND_POWER_OF_TWO(var, num_pels_log2_lookup[bs]);
}
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#endif  // CONFIG_HIGHBITDEPTH
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static unsigned int get_sby_perpixel_diff_variance(const AV1_COMP *const 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(AV1_COMP *cpi, MACROBLOCK *x,
                                                   int mi_row, int mi_col) {
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  unsigned int var = get_sby_perpixel_diff_variance(
      cpi, &x->plane[0].src, mi_row, mi_col, BLOCK_64X64);
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  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 void set_mode_info_offsets(const AV1_COMP *const cpi,
                                  MACROBLOCK *const x, MACROBLOCKD *const xd,
                                  int mi_row, int mi_col) {
  const AV1_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_without_segment_id(const AV1_COMP *const cpi,
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                                           const TileInfo *const tile,
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                                           MACROBLOCK *const x, int mi_row,
                                           int mi_col, BLOCK_SIZE bsize) {
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  const AV1_COMMON *const cm = &cpi->common;
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  MACROBLOCKD *const xd = &x->e_mbd;
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  const int mi_width = mi_size_wide[bsize];
  const int mi_height = mi_size_high[bsize];
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  set_mode_info_offsets(cpi, x, xd, mi_row, mi_col);
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  set_skip_context(xd, mi_row, mi_col);
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  xd->above_txfm_context =
      cm->above_txfm_context + (mi_col << TX_UNIT_WIDE_LOG2);
  xd->left_txfm_context = xd->left_txfm_context_buffer +
                          ((mi_row & MAX_MIB_MASK) << TX_UNIT_HIGH_LOG2);
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  // Set up destination pointers.
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  av1_setup_dst_planes(xd->plane, bsize, get_frame_new_buffer(cm), mi_row,
                       mi_col);
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  // Set up limit values for MV components.
  // Mv beyond the range do not produce new/different prediction block.
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  x->mv_limits.row_min =
      -(((mi_row + mi_height) * MI_SIZE) + AOM_INTERP_EXTEND);
  x->mv_limits.col_min = -(((mi_col + mi_width) * MI_SIZE) + AOM_INTERP_EXTEND);
  x->mv_limits.row_max = (cm->mi_rows - mi_row) * MI_SIZE + AOM_INTERP_EXTEND;
  x->mv_limits.col_max = (cm->mi_cols - mi_col) * MI_SIZE + AOM_INTERP_EXTEND;
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  set_plane_n4(xd, mi_width, mi_height);
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  // 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)));
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  set_mi_row_col(xd, tile, mi_row, mi_height, mi_col, mi_width,
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#if CONFIG_DEPENDENT_HORZTILES
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                 cm->dependent_horz_tiles,
#endif  // CONFIG_DEPENDENT_HORZTILES
                 cm->mi_rows, cm->mi_cols);
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  // Set up source buffers.
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  av1_setup_src_planes(x, cpi->source, mi_row, mi_col);
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  // R/D setup.
  x->rdmult = cpi->rd.RDMULT;

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  // required by av1_append_sub8x8_mvs_for_idx() and av1_find_best_ref_mvs()
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  xd->tile = *tile;
}

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static void set_offsets(const AV1_COMP *const 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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  const AV1_COMMON *const cm = &cpi->common;
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  MACROBLOCKD *const xd = &x->e_mbd;
  MB_MODE_INFO *mbmi;
  const struct segmentation *const seg = &cm->seg;

  set_offsets_without_segment_id(cpi, tile, x, mi_row, mi_col, bsize);

  mbmi = &xd->mi[0]->mbmi;
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#if CONFIG_CFL
  xd->cfl->mi_row = mi_row;
  xd->cfl->mi_col = mi_col;
#endif
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  // Setup segment ID.
  if (seg->enabled) {
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    if (!cpi->vaq_refresh) {
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      const uint8_t *const map =
          seg->update_map ? cpi->segmentation_map : cm->last_frame_seg_map;
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      mbmi->segment_id = get_segment_id(cm, map, bsize, mi_row, mi_col);
    }
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    av1_init_plane_quantizers(cpi, x, mbmi->segment_id);
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  } else {
    mbmi->segment_id = 0;
  }
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}

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#if CONFIG_DUAL_FILTER
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static void reset_intmv_filter_type(const AV1_COMMON *const cm, MACROBLOCKD *xd,
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                                    MB_MODE_INFO *mbmi) {
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  InterpFilter filters[2];
  InterpFilter default_filter = av1_unswitchable_filter(cm->interp_filter);

  for (int dir = 0; dir < 2; ++dir) {
    filters[dir] = ((!has_subpel_mv_component(xd->mi[0], xd, dir) &&
                     (mbmi->ref_frame[1] == NONE_FRAME ||
                      !has_subpel_mv_component(xd->mi[0], xd, dir + 2)))
                        ? default_filter
                        : av1_extract_interp_filter(mbmi->interp_filters, dir));
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  }
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  mbmi->interp_filters = av1_make_interp_filters(filters[0], filters[1]);
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}

static void update_filter_type_count(FRAME_COUNTS *counts,
                                     const MACROBLOCKD *xd,
                                     const MB_MODE_INFO *mbmi) {
  int dir;
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  for (dir = 0; dir < 2; ++dir) {
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    if (has_subpel_mv_component(xd->mi[0], xd, dir) ||
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        (mbmi->ref_frame[1] > INTRA_FRAME &&
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         has_subpel_mv_component(xd->mi[0], xd, dir + 2))) {
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      const int ctx = av1_get_pred_context_switchable_interp(xd, dir);
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      InterpFilter filter =
          av1_extract_interp_filter(mbmi->interp_filters, dir);
      ++counts->switchable_interp[ctx][filter];
      update_cdf(xd->tile_ctx->switchable_interp_cdf[ctx], filter,
                 SWITCHABLE_FILTERS);
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    }
  }
}
#endif
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static void update_global_motion_used(PREDICTION_MODE mode, BLOCK_SIZE bsize,
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                                      const MB_MODE_INFO *mbmi,
                                      RD_COUNTS *rdc) {
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  if (mode == ZEROMV || mode == ZERO_ZEROMV) {
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    const int num_4x4s =
        num_4x4_blocks_wide_lookup[bsize] * num_4x4_blocks_high_lookup[bsize];
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    int ref;
    for (ref = 0; ref < 1 + has_second_ref(mbmi); ++ref) {
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      rdc->global_motion_used[mbmi->ref_frame[ref]] += num_4x4s;
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    }
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  }
}
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static void reset_tx_size(MACROBLOCKD *xd, MB_MODE_INFO *mbmi,
                          const TX_MODE tx_mode) {
  if (xd->lossless[mbmi->segment_id]) {
    mbmi->tx_size = TX_4X4;
  } else if (tx_mode != TX_MODE_SELECT) {
    mbmi->tx_size =
        tx_size_from_tx_mode(mbmi->sb_type, tx_mode, is_inter_block(mbmi));
  }
}

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static void set_ref_and_pred_mvs(MACROBLOCK *const x, int_mv *const mi_pred_mv,
                                 int8_t rf_type) {
  MACROBLOCKD *const xd = &x->e_mbd;
  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;

  const int bw = xd->n8_w << MI_SIZE_LOG2;
  const int bh = xd->n8_h << MI_SIZE_LOG2;
  int ref_mv_idx = mbmi->ref_mv_idx;
  MB_MODE_INFO_EXT *const mbmi_ext = x->mbmi_ext;
  CANDIDATE_MV *const curr_ref_mv_stack = mbmi_ext->ref_mv_stack[rf_type];

  if (has_second_ref(mbmi)) {
    // Special case: NEAR_NEWMV and NEW_NEARMV modes use 1 + mbmi->ref_mv_idx
    // (like NEARMV) instead
    if (mbmi->mode == NEAR_NEWMV || mbmi->mode == NEW_NEARMV) ref_mv_idx += 1;

    if (compound_ref0_mode(mbmi->mode) == NEWMV) {
      int_mv this_mv = curr_ref_mv_stack[ref_mv_idx].this_mv;
      clamp_mv_ref(&this_mv.as_mv, bw, bh, xd);
      mbmi_ext->ref_mvs[mbmi->ref_frame[0]][0] = this_mv;
      mbmi->pred_mv[0] = this_mv;
      mi_pred_mv[0] = this_mv;
    }
    if (compound_ref1_mode(mbmi->mode) == NEWMV) {
      int_mv this_mv = curr_ref_mv_stack[ref_mv_idx].comp_mv;
      clamp_mv_ref(&this_mv.as_mv, bw, bh, xd);
      mbmi_ext->ref_mvs[mbmi->ref_frame[1]][0] = this_mv;
      mbmi->pred_mv[1] = this_mv;
      mi_pred_mv[1] = this_mv;
    }
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#if CONFIG_COMPOUND_SINGLEREF
  } else if (is_inter_singleref_comp_mode(mbmi->mode)) {
    // Special case: SR_NEAR_NEWMV uses 1 + mbmi->ref_mv_idx
    // (like NEARMV) instead
    if (mbmi->mode == SR_NEAR_NEWMV) ref_mv_idx += 1;

    if (compound_ref0_mode(mbmi->mode) == NEWMV ||
        compound_ref1_mode(mbmi->mode) == NEWMV) {
      int_mv this_mv = curr_ref_mv_stack[ref_mv_idx].this_mv;
      clamp_mv_ref(&this_mv.as_mv, bw, bh, xd);
      mbmi_ext->ref_mvs[mbmi->ref_frame[0]][0] = this_mv;
      mbmi->pred_mv[0] = this_mv;
      mi_pred_mv[0] = this_mv;
    }
#endif  // CONFIG_COMPOUND_SINGLEREF
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  } else {
    if (mbmi->mode == NEWMV) {
      int i;
      for (i = 0; i < 1 + has_second_ref(mbmi); ++i) {
        int_mv this_mv = (i == 0) ? curr_ref_mv_stack[ref_mv_idx].this_mv
                                  : curr_ref_mv_stack[ref_mv_idx].comp_mv;
        clamp_mv_ref(&this_mv.as_mv, bw, bh, xd);
        mbmi_ext->ref_mvs[mbmi->ref_frame[i]][0] = this_mv;
        mbmi->pred_mv[i] = this_mv;
        mi_pred_mv[i] = this_mv;
      }
    }
  }
}

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static void update_state(const AV1_COMP *const cpi, ThreadData *td,
                         PICK_MODE_CONTEXT *ctx, int mi_row, int mi_col,
                         BLOCK_SIZE bsize, RUN_TYPE dry_run) {
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  int i, x_idx, y;
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  const AV1_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;
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  const int bw = mi_size_wide[mi->mbmi.sb_type];
  const int bh = mi_size_high[mi->mbmi.sb_type];
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  const int mis = cm->mi_stride;
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  const int mi_width = mi_size_wide[bsize];
  const int mi_height = mi_size_high[bsize];
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  int8_t rf_type;

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

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

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#if CONFIG_DUAL_FILTER
  reset_intmv_filter_type(cm, xd, mbmi);
#endif

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  rf_type = av1_ref_frame_type(mbmi->ref_frame);
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  if (x->mbmi_ext->ref_mv_count[rf_type] > 1) {
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    set_ref_and_pred_mvs(x, mi->mbmi.pred_mv, rf_type);
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  }
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  // 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) {
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      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);
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      reset_tx_size(xd, &mi_addr->mbmi, cm->tx_mode);
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    }
    // 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) {
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      av1_cyclic_refresh_update_segment(cpi, &xd->mi[0]->mbmi, mi_row, mi_col,
                                        bsize, ctx->rate, ctx->dist, x->skip);
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      reset_tx_size(xd, &mi_addr->mbmi, cm->tx_mode);
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    }
  }

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  for (i = 0; i < MAX_MB_PLANE; ++i) {
    p[i].coeff = ctx->coeff[i];
    p[i].qcoeff = ctx->qcoeff[i];
    pd[i].dqcoeff = ctx->dqcoeff[i];
    p[i].eobs = ctx->eobs[i];
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#if CONFIG_LV_MAP
    p[i].txb_entropy_ctx = ctx->txb_entropy_ctx[i];
#endif  // CONFIG_LV_MAP
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  }
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  for (i = 0; i < 2; ++i) pd[i].color_index_map = ctx->color_index_map[i];
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#if CONFIG_MRC_TX
  xd->mrc_mask = ctx->mrc_mask;
#endif  // CONFIG_MRC_TX
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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++)
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      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) {
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        xd->mi[x_idx + y * mis] = mi_addr;
      }

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#if !CONFIG_EXT_DELTA_Q
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  if (cpi->oxcf.aq_mode > NO_AQ && cpi->oxcf.aq_mode < DELTA_AQ)
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    av1_init_plane_quantizers(cpi, x, xd->mi[0]->mbmi.segment_id);
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#else
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  if (cpi->oxcf.aq_mode)
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    av1_init_plane_quantizers(cpi, x, xd->mi[0]->mbmi.segment_id);
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#endif
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  x->skip = ctx->skip;
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  for (i = 0; i < 1; ++i)
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    memcpy(x->blk_skip[i], ctx->blk_skip[i],
           sizeof(uint8_t) * ctx->num_4x4_blk);
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  if (dry_run) return;
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#if CONFIG_INTERNAL_STATS
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  {
    unsigned int *const mode_chosen_counts =
        (unsigned int *)cpi->mode_chosen_counts;  // Cast const away.
    if (frame_is_intra_only(cm)) {
      static const int kf_mode_index[] = {
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        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_SMOOTH, /*SMOOTH_PRED*/
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#if CONFIG_SMOOTH_HV
        THR_SMOOTH_V, /*SMOOTH_V_PRED*/
        THR_SMOOTH_H, /*SMOOTH_H_PRED*/
#endif                // CONFIG_SMOOTH_HV
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        THR_PAETH /*PAETH_PRED*/,
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      };
      ++mode_chosen_counts[kf_mode_index[mbmi->mode]];
    } else {
      // Note how often each mode chosen as best
      ++mode_chosen_counts[ctx->best_mode_index];
    }
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  }
#endif
  if (!frame_is_intra_only(cm)) {
    if (is_inter_block(mbmi)) {
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      av1_update_mv_count(td);
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      if (bsize >= BLOCK_8X8) {
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        // TODO(sarahparker): global motion stats need to be handled per-tile
        // to be compatible with tile-based threading.
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        update_global_motion_used(mbmi->mode, bsize, mbmi, rdc);
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      } 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;
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            update_global_motion_used(mi->bmi[j].as_mode, bsize, mbmi, rdc);
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          }
        }
      }
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      if (cm->interp_filter == SWITCHABLE &&
          mbmi->motion_mode != WARPED_CAUSAL &&
          !is_nontrans_global_motion(xd)) {
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#if CONFIG_DUAL_FILTER
        update_filter_type_count(td->counts, xd, mbmi);
#else
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        const int switchable_ctx = av1_get_pred_context_switchable_interp(xd);
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        const InterpFilter filter =
            av1_extract_interp_filter(mbmi->interp_filters, 0);
        ++td->counts->switchable_interp[switchable_ctx][filter];
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#endif
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      }
    }

    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;
  }

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  const int x_mis = AOMMIN(bw, cm->mi_cols - mi_col);
  const int y_mis = AOMMIN(bh, cm->mi_rows - mi_row);
  av1_copy_frame_mvs(cm, mi, mi_row, mi_col, x_mis, y_mis);
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#if CONFIG_JNT_COMP
  if (has_second_ref(mbmi)) {
    const int comp_index_ctx = get_comp_index_context(cm, xd);
    ++td->counts->compound_index[comp_index_ctx][mbmi->compound_idx];
  }
#endif  // CONFIG_JNT_COMP
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}

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#if NC_MODE_INFO
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static void set_mode_info_b(const AV1_COMP *const cpi,
                            const TileInfo *const tile, ThreadData *td,
                            int mi_row, int mi_col, BLOCK_SIZE bsize,
                            PICK_MODE_CONTEXT *ctx) {
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  MACROBLOCK *const x = &td->mb;
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  set_offsets(cpi, tile, x, mi_row, mi_col, bsize);
  update_state(cpi, td, ctx, mi_row, mi_col, bsize, 1);
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}

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static void set_mode_info_sb(const AV1_COMP *const cpi, ThreadData *td,
                             const TileInfo *const tile, TOKENEXTRA **tp,
                             int mi_row, int mi_col, BLOCK_SIZE bsize,
                             PC_TREE *pc_tree) {
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  const AV1_COMMON *const cm = &cpi->common;
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  const int hbs = mi_size_wide[bsize] / 2;
  const PARTITION_TYPE partition = pc_tree->partitioning;
  BLOCK_SIZE subsize = get_subsize(bsize, partition);
#if CONFIG_EXT_PARTITION_TYPES
  const BLOCK_SIZE bsize2 = get_subsize(bsize, PARTITION_SPLIT);
  const int quarter_step = mi_size_wide[bsize] / 4;
#endif
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  if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols) return;
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  switch (partition) {
    case PARTITION_NONE:
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      set_mode_info_b(cpi, tile, td, mi_row, mi_col, subsize, &pc_tree->none);
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      break;
    case PARTITION_VERT:
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      set_mode_info_b(cpi, tile, td, mi_row, mi_col, subsize,
                      &pc_tree->vertical[0]);
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      if (mi_col + hbs < cm->mi_cols) {
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        set_mode_info_b(cpi, tile, td, mi_row, mi_col + hbs, subsize,
                        &pc_tree->vertical[1]);
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      }
      break;
    case PARTITION_HORZ:
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      set_mode_info_b(cpi, tile, td, mi_row, mi_col, subsize,
                      &pc_tree->horizontal[0]);
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      if (mi_row + hbs < cm->mi_rows) {
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        set_mode_info_b(cpi, tile, td, mi_row + hbs, mi_col, subsize,
                        &pc_tree->horizontal[1]);
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      }
      break;
    case PARTITION_SPLIT:
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      set_mode_info_sb(cpi, td, tile, tp, mi_row, mi_col, subsize,
                       pc_tree->split[0]);
      set_mode_info_sb(cpi, td, tile, tp, mi_row, mi_col + hbs, subsize,
                       pc_tree->split[1]);
      set_mode_info_sb(cpi, td, tile, tp, mi_row + hbs, mi_col, subsize,
                       pc_tree->split[2]);
      set_mode_info_sb(cpi, td, tile, tp, mi_row + hbs, mi_col + hbs, subsize,
                       pc_tree->split[3]);
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      break;
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#if CONFIG_EXT_PARTITION_TYPES
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#if CONFIG_EXT_PARTITION_TYPES_AB
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#error NC_MODE_INFO+MOTION_VAR not yet supported for new HORZ/VERT_AB partitions
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#endif
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    case PARTITION_HORZ_A:
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      set_mode_info_b(cpi, tile, td, mi_row, mi_col, bsize2,
                      &pc_tree->horizontala[0]);
      set_mode_info_b(cpi, tile, td, mi_row, mi_col + hbs, bsize2,
                      &pc_tree->horizontala[1]);
      set_mode_info_b(cpi, tile, td, mi_row + hbs, mi_col, subsize,
                      &pc_tree->horizontala[2]);
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      break;
    case PARTITION_HORZ_B:
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      set_mode_info_b(cpi, tile, td, mi_row, mi_col, subsize,
                      &pc_tree->horizontalb[0]);
      set_mode_info_b(cpi, tile, td, mi_row + hbs, mi_col, bsize2,
                      &pc_tree->horizontalb[1]);
      set_mode_info_b(cpi, tile, td, mi_row + hbs, mi_col + hbs, bsize2,
                      &pc_tree->horizontalb[2]);
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      break;
    case PARTITION_VERT_A:
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      set_mode_info_b(cpi, tile, td, mi_row, mi_col, bsize2,
                      &pc_tree->verticala[0]);
      set_mode_info_b(cpi, tile, td, mi_row + hbs, mi_col, bsize2,
                      &pc_tree->verticala[1]);
      set_mode_info_b(cpi, tile, td, mi_row, mi_col + hbs, subsize,
                      &pc_tree->verticala[2]);
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      break;
    case PARTITION_VERT_B:
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      set_mode_info_b(cpi, tile, td, mi_row, mi_col, subsize,
                      &pc_tree->verticalb[0]);
      set_mode_info_b(cpi, tile, td, mi_row, mi_col + hbs, bsize2,
                      &pc_tree->verticalb[1]);
      set_mode_info_b(cpi, tile, td, mi_row + hbs, mi_col + hbs, bsize2,
                      &pc_tree->verticalb[2]);
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      break;
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    case PARTITION_HORZ_4:
      for (int i = 0; i < 4; ++i) {
        int this_mi_row = mi_row + i * quarter_step;
        if (i > 0 && this_mi_row >= cm->mi_rows) break;
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        set_mode_info_b(cpi, tile, td, this_mi_row, mi_col, subsize,
                        &pc_tree->horizontal4[i]);
      }
      break;
    case PARTITION_VERT_4:
      for (int i = 0; i < 4; ++i) {
        int this_mi_col = mi_col + i * quarter_step;
        if (i > 0 && this_mi_col >= cm->mi_cols) break;
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        set_mode_info_b(cpi, tile, td, mi_row, this_mi_col, subsize,
                        &pc_tree->vertical4[i]);
      }
      break;
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#endif  // CONFIG_EXT_PARTITION_TYPES
    default: assert(0 && "Invalid partition type."); break;
  }
}
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#if CONFIG_NCOBMC_ADAPT_WEIGHT
static void av1_get_ncobmc_mode_rd(const AV1_COMP *const cpi,
                                   MACROBLOCK *const x, MACROBLOCKD *const xd,
                                   int bsize, const int mi_row,
                                   const int mi_col, NCOBMC_MODE *mode) {
  const AV1_COMMON *const cm = &cpi->common;
  const int mi_width = mi_size_wide[bsize];
  const int mi_height = mi_size_high[bsize];

  assert(bsize >= BLOCK_8X8);

  reset_xd_boundary(xd, mi_row, mi_height, mi_col, mi_width, cm->mi_rows,
                    cm->mi_cols);

  // set up source buffers before calling the mode searching function
  av1_setup_src_planes(x, cpi->source, mi_row, mi_col);

  *mode = get_ncobmc_mode(cpi, x, xd, mi_row, mi_col, bsize);
}
static void get_ncobmc_intrpl_pred(const AV1_COMP *const cpi, ThreadData *td,
                                   int mi_row, int mi_col, BLOCK_SIZE bsize) {
  MACROBLOCK *const x = &td->mb;
  MACROBLOCKD *const xd = &x->e_mbd;
  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  const int mi_width = mi_size_wide[bsize];
  const int mi_height = mi_size_high[bsize];
  const int hbs = AOMMAX(mi_size_wide[bsize] / 2, mi_size_high[bsize] / 2);
  const BLOCK_SIZE sqr_blk = bsize_2_sqr_bsize[bsize];

  if (mi_width > mi_height) {
    // horizontal partition
    av1_get_ncobmc_mode_rd(cpi, x, xd, sqr_blk, mi_row, mi_col,
                           &mbmi->ncobmc_mode[0]);
    xd->mi += hbs;
    av1_get_ncobmc_mode_rd(cpi, x, xd, sqr_blk, mi_row, mi_col + hbs,
                           &mbmi->ncobmc_mode[1]);
  } else if (mi_height > mi_width) {
    // vertical partition
    av1_get_ncobmc_mode_rd(cpi, x, xd, sqr_blk, mi_row, mi_col,
                           &mbmi->ncobmc_mode[0]);
    xd->mi += hbs * xd->mi_stride;
    av1_get_ncobmc_mode_rd(cpi, x, xd, sqr_blk, mi_row + hbs, mi_col,
                           &mbmi->ncobmc_mode[1]);
  } else {
    av1_get_ncobmc_mode_rd(cpi, x, xd, sqr_blk, mi_row, mi_col,
                           &mbmi->ncobmc_mode[0]);
  }
  // restore the info
  av1_setup_src_planes(x, cpi->source, mi_row, mi_col);
  set_mode_info_offsets(cpi, x, xd, mi_row, mi_col);
}
#endif  // CONFIG_NCOBMC_ADAPT_WEIGHT
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#endif  // (CONFIG_NCOBMC || CONFIG_NCOBMC_ADAPT_WEIGHT)
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void av1_setup_src_planes(MACROBLOCK *x, const YV12_BUFFER_CONFIG *src,
                          int mi_row, int mi_col) {
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  uint8_t *const buffers[3] = { src->y_buffer, src->u_buffer, src->v_buffer };
  const int widths[3] = { src->y_crop_width, src->uv_crop_width,
                          src->uv_crop_width };
  const int heights[3] = { src->y_crop_height, src->uv_crop_height,
                           src->uv_crop_height };
  const int strides[3] = { src->y_stride, src->uv_stride, src->uv_stride };
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  int i;

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

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

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static int set_segment_rdmult(const AV1_COMP *const cpi, MACROBLOCK *const x,
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                              int8_t segment_id) {
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  int segment_qindex;
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  const AV1_COMMON *const cm = &cpi->common;
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  av1_init_plane_quantizers(cpi, x, segment_id);
  aom_clear_system_state();
  segment_qindex = av1_get_qindex(&cm->seg, segment_id, cm->base_qindex);
  return av1_compute_rd_mult(cpi, segment_qindex + cm->y_dc_delta_q);
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}

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#if CONFIG_DIST_8X8
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static void dist_8x8_set_sub8x8_dst(MACROBLOCK *const x, uint8_t *dst8x8,
                                    BLOCK_SIZE bsize, int bw, int bh,
                                    int mi_row, int mi_col) {
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  MACROBLOCKD *const xd = &x->e_mbd;
  struct macroblockd_plane *const pd = &xd->plane[0];
  const int dst_stride = pd->dst.stride;
  uint8_t *dst = pd->dst.buf;

  assert(bsize < BLOCK_8X8);

  if (bsize < BLOCK_8X8) {
    int i, j;
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#if CONFIG_HIGHBITDEPTH
    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
      uint16_t *dst8x8_16 = (uint16_t *)dst8x8;
      uint16_t *dst_sub8x8 = &dst8x8_16[((mi_row & 1) * 8 + (mi_col & 1)) << 2];
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      for (j = 0; j < bh; ++j)
        for (i = 0; i < bw; ++i)
          dst_sub8x8[j * 8 + i] = CONVERT_TO_SHORTPTR(dst)[j * dst_stride + i];
    } else {
#endif
      uint8_t *dst_sub8x8 = &dst8x8[((mi_row & 1) * 8 + (mi_col & 1)) << 2];

      for (j = 0; j < bh; ++j)
        for (i = 0; i < bw; ++i)
          dst_sub8x8[j * 8 + i] = dst[j * dst_stride + i];
#if CONFIG_HIGHBITDEPTH
    }
#endif
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  }
}
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#endif  // CONFIG_DIST_8X8
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static void rd_pick_sb_modes(const AV1_COMP *const cpi, TileDataEnc *tile_data,
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                             MACROBLOCK *const x, int mi_row, int mi_col,
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                             RD_STATS *rd_cost,
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#if CONFIG_EXT_PARTITION_TYPES
                             PARTITION_TYPE partition,
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#endif
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                             BLOCK_SIZE bsize, PICK_MODE_CONTEXT *ctx,
                             int64_t best_rd) {
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  const AV1_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;

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  aom_clear_system_state();
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  set_offsets(cpi, tile_info, x, mi_row, mi_col, bsize);
  mbmi = &xd->mi[0]->mbmi;
  mbmi->sb_type = bsize;
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#if CONFIG_RD_DEBUG
  mbmi->mi_row = mi_row;
  mbmi->mi_col = mi_col;
#endif
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#if CONFIG_EXT_PARTITION_TYPES
  mbmi->partition = partition;
#endif
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  for (i = 0; i < MAX_MB_PLANE; ++i) {
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    p[i].coeff = ctx->coeff[i];
    p[i].qcoeff = ctx->qcoeff[i];
    pd[i].dqcoeff = ctx->dqcoeff[i];
    p[i].eobs = ctx->eobs[i];
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#if CONFIG_LV_MAP
    p[i].txb_entropy_ctx = ctx->txb_entropy_ctx[i];
#endif
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  }
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  for (i = 0; i < 2; ++i) pd[i].color_index_map = ctx->color_index_map[i];
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#if CONFIG_MRC_TX
  xd->mrc_mask = ctx->mrc_mask;
#endif  // CONFIG_MRC_TX
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  ctx->skippable = 0;

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

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  x->skip_chroma_rd =
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      !is_chroma_reference(mi_row, mi_col, bsize, xd->plane[1].subsampling_x,
                           xd->plane[1].subsampling_y);
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#if CONFIG_HIGHBITDEPTH
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  if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
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    x->source_variance = av1_high_get_sby_perpixel_variance(
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        cpi, &x->plane[0].src, bsize, xd->bd);
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  } else {
    x->source_variance =
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        av1_get_sby_perpixel_variance(cpi, &x->plane[0].src, bsize);
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  }
#else
  x->source_variance =
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      av1_get_sby_perpixel_variance(cpi, &x->plane[0].src, bsize);
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#endif  // CONFIG_HIGHBITDEPTH
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  // Save rdmult before it might be changed, so it can be restored later.
  orig_rdmult = x->rdmult;

  if (aq_mode == VARIANCE_AQ) {
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    if (cpi->vaq_refresh) {
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      const int energy =
          bsize <= BLOCK_16X16 ? x->mb_energy : av1_block_energy(cpi, x, bsize);
      mbmi->segment_id = av1_vaq_segment_id(energy);
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      // Re-initialise quantiser
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      av1_init_plane_quantizers(cpi, x, mbmi->segment_id);
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    }
    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) {
    // If segment is boosted, use rdmult for that segment.
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    if (cyclic_refresh_segment_id_boosted(mbmi->segment_id))
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      x->rdmult = av1_cyclic_refresh_get_rdmult(cpi->cyclic_refresh);
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  }

  // 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)) {
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    av1_rd_pick_intra_mode_sb(cpi, x, rd_cost, bsize, ctx, best_rd);
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  } else {
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    if (segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
      av1_rd_pick_inter_mode_sb_seg_skip(cpi, tile_data, x, mi_row, mi_col,
                                         rd_cost, bsize, ctx, best_rd);
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    } else {
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      av1_rd_pick_inter_mode_sb(cpi, tile_data, x, mi_row, mi_col, rd_cost,
                                bsize, ctx, best_rd);
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    }
  }

  // Examine the resulting rate and for AQ mode 2 make a segment choice.
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  if ((rd_cost->rate != INT_MAX) && (aq_mode == COMPLEXITY_AQ) &&
      (bsize >= BLOCK_16X16) &&
      (cm->frame_type == KEY_FRAME || cpi->refresh_alt_ref_frame ||
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       cpi->refresh_alt2_ref_frame ||
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       (cpi->refresh_golden_frame && !cpi->rc.is_src_frame_alt_ref))) {
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    av1_caq_select_segment(cpi, x, bsize, mi_row, mi_col, rd_cost->rate);
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  }

  x->rdmult = orig_rdmult;

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

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static void update_inter_mode_stats(FRAME_COUNTS *counts, PREDICTION_MODE mode,
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                                    int16_t mode_context) {
  int16_t mode_ctx = mode_context & NEWMV_CTX_MASK;
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  if (mode == NEWMV) {
    ++counts->newmv_mode[mode_ctx][0];
    return;
  } else {
    ++counts->newmv_mode[mode_ctx][1];
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    if (mode_context & (1 << ALL_ZERO_FLAG_OFFSET)) {
      return;
    }

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    mode_ctx = (mode_context >> ZEROMV_OFFSET) & ZEROMV_CTX_MASK;
    if (mode == ZEROMV) {
      ++counts->zeromv_mode[mode_ctx][0];
      return;
    } else {
      ++counts->zeromv_mode[mode_ctx][1];
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      mode_ctx = (mode_context >> REFMV_OFFSET) & REFMV_CTX_MASK;
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      if (mode_context & (1 << SKIP_NEARESTMV_OFFSET)) mode_ctx = 6;
      if (mode_context & (1 << SKIP_NEARMV_OFFSET)) mode_ctx = 7;
      if (mode_context & (1 << SKIP_NEARESTMV_SUB8X8_OFFSET)) mode_ctx = 8;
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      ++counts->refmv_mode[mode_ctx][mode != NEARESTMV];
    }
  }
}

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static void update_stats(const AV1_COMMON *const cm, ThreadData *td, int mi_row,
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                         int mi_col) {
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  MACROBLOCK *x = &td->mb;
  MACROBLOCKD *const xd = &x->e_mbd;
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