/*
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
 *
 * 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.
 */

#include <assert.h>

#include "av1/common/common.h"
#include "av1/common/entropy.h"
#include "av1/common/entropymode.h"
#include "av1/common/entropymv.h"
#include "av1/common/mvref_common.h"
#include "av1/common/pred_common.h"
#include "av1/common/reconinter.h"
#if CONFIG_EXT_INTRA
#include "av1/common/reconintra.h"
#endif  // CONFIG_EXT_INTRA
#include "av1/common/seg_common.h"
#include "av1/common/warped_motion.h"

#include "av1/decoder/decodeframe.h"
#include "av1/decoder/decodemv.h"

#include "aom_dsp/aom_dsp_common.h"

#if CONFIG_CFL
#include "av1/common/cfl.h"
#endif

#define ACCT_STR __func__

#define DEC_MISMATCH_DEBUG 0

static PREDICTION_MODE read_intra_mode(aom_reader *r, aom_cdf_prob *cdf) {
  return (PREDICTION_MODE)aom_read_symbol(r, cdf, INTRA_MODES, ACCT_STR);
}

static void read_cdef(AV1_COMMON *cm, aom_reader *r, MB_MODE_INFO *const mbmi,
                      int mi_col, int mi_row) {
  if (cm->all_lossless) return;

  const int m = ~((1 << (6 - MI_SIZE_LOG2)) - 1);
  if (!(mi_col & (cm->mib_size - 1)) &&
      !(mi_row & (cm->mib_size - 1))) {  // Top left?
#if CONFIG_EXT_PARTITION
    cm->cdef_preset[0] = cm->cdef_preset[1] = cm->cdef_preset[2] =
        cm->cdef_preset[3] = -1;
#else
    cm->cdef_preset = -1;
#endif
  }
// Read CDEF param at first a non-skip coding block
#if CONFIG_EXT_PARTITION
  const int mask = 1 << (6 - MI_SIZE_LOG2);
  const int index = cm->sb_size == BLOCK_128X128
                        ? !!(mi_col & mask) + 2 * !!(mi_row & mask)
                        : 0;
  cm->mi_grid_visible[(mi_row & m) * cm->mi_stride + (mi_col & m)]
      ->mbmi.cdef_strength = cm->cdef_preset[index] =
      cm->cdef_preset[index] == -1 && !mbmi->skip
          ? aom_read_literal(r, cm->cdef_bits, ACCT_STR)
          : cm->cdef_preset[index];
#else
  cm->mi_grid_visible[(mi_row & m) * cm->mi_stride + (mi_col & m)]
      ->mbmi.cdef_strength = cm->cdef_preset =
      cm->cdef_preset == -1 && !mbmi->skip
          ? aom_read_literal(r, cm->cdef_bits, ACCT_STR)
          : cm->cdef_preset;
#endif
}

static int read_delta_qindex(AV1_COMMON *cm, MACROBLOCKD *xd, aom_reader *r,
                             MB_MODE_INFO *const mbmi, int mi_col, int mi_row) {
  FRAME_COUNTS *counts = xd->counts;
  int sign, abs, reduced_delta_qindex = 0;
  BLOCK_SIZE bsize = mbmi->sb_type;
  const int b_col = mi_col & (cm->mib_size - 1);
  const int b_row = mi_row & (cm->mib_size - 1);
  const int read_delta_q_flag = (b_col == 0 && b_row == 0);
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  (void)cm;

  if ((bsize != cm->sb_size || mbmi->skip == 0) && read_delta_q_flag) {
    abs = aom_read_symbol(r, ec_ctx->delta_q_cdf, DELTA_Q_PROBS + 1, ACCT_STR);
    const int smallval = (abs < DELTA_Q_SMALL);
    if (counts) {
      for (int i = 0; i < abs; ++i) counts->delta_q[i][1]++;
      if (smallval) counts->delta_q[abs][0]++;
    }

    if (!smallval) {
      const int rem_bits = aom_read_literal(r, 3, ACCT_STR) + 1;
      const int thr = (1 << rem_bits) + 1;
      abs = aom_read_literal(r, rem_bits, ACCT_STR) + thr;
    }

    if (abs) {
      sign = aom_read_bit(r, ACCT_STR);
    } else {
      sign = 1;
    }

    reduced_delta_qindex = sign ? -abs : abs;
  }
  return reduced_delta_qindex;
}
#if CONFIG_EXT_DELTA_Q
static int read_delta_lflevel(AV1_COMMON *cm, MACROBLOCKD *xd, aom_reader *r,
#if CONFIG_LOOPFILTER_LEVEL
                              int lf_id,
#endif
                              MB_MODE_INFO *const mbmi, int mi_col,
                              int mi_row) {
  FRAME_COUNTS *counts = xd->counts;
  int sign, abs, reduced_delta_lflevel = 0;
  BLOCK_SIZE bsize = mbmi->sb_type;
  const int b_col = mi_col & (cm->mib_size - 1);
  const int b_row = mi_row & (cm->mib_size - 1);
  const int read_delta_lf_flag = (b_col == 0 && b_row == 0);
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  (void)cm;

  if ((bsize != cm->sb_size || mbmi->skip == 0) && read_delta_lf_flag) {
#if CONFIG_LOOPFILTER_LEVEL
    if (cm->delta_lf_multi) {
      assert(lf_id >= 0 && lf_id < FRAME_LF_COUNT);
      abs = aom_read_symbol(r, ec_ctx->delta_lf_multi_cdf[lf_id],
                            DELTA_LF_PROBS + 1, ACCT_STR);
    } else {
      abs = aom_read_symbol(r, ec_ctx->delta_lf_cdf, DELTA_LF_PROBS + 1,
                            ACCT_STR);
    }
#else
    abs =
        aom_read_symbol(r, ec_ctx->delta_lf_cdf, DELTA_LF_PROBS + 1, ACCT_STR);
#endif  // CONFIG_LOOPFILTER_LEVEL
    const int smallval = (abs < DELTA_LF_SMALL);
    if (counts) {
#if CONFIG_LOOPFILTER_LEVEL
      if (cm->delta_lf_multi) {
        for (int i = 0; i < abs; ++i) counts->delta_lf_multi[lf_id][i][1]++;
        if (smallval) counts->delta_lf_multi[lf_id][abs][0]++;
      } else {
        for (int i = 0; i < abs; ++i) counts->delta_lf[i][1]++;
        if (smallval) counts->delta_lf[abs][0]++;
      }
#else
      for (int i = 0; i < abs; ++i) counts->delta_lf[i][1]++;
      if (smallval) counts->delta_lf[abs][0]++;
#endif  // CONFIG_LOOPFILTER_LEVEL
    }
    if (!smallval) {
      const int rem_bits = aom_read_literal(r, 3, ACCT_STR) + 1;
      const int thr = (1 << rem_bits) + 1;
      abs = aom_read_literal(r, rem_bits, ACCT_STR) + thr;
    }

    if (abs) {
      sign = aom_read_bit(r, ACCT_STR);
    } else {
      sign = 1;
    }

    reduced_delta_lflevel = sign ? -abs : abs;
  }
  return reduced_delta_lflevel;
}
#endif

static UV_PREDICTION_MODE read_intra_mode_uv(FRAME_CONTEXT *ec_ctx,
                                             aom_reader *r,
                                             PREDICTION_MODE y_mode) {
  const UV_PREDICTION_MODE uv_mode =
#if CONFIG_CFL
      aom_read_symbol(r, ec_ctx->uv_mode_cdf[y_mode], UV_INTRA_MODES, ACCT_STR);
#else
      read_intra_mode(r, ec_ctx->uv_mode_cdf[y_mode]);
#endif  // CONFIG_CFL
  return uv_mode;
}

#if CONFIG_CFL
static int read_cfl_alphas(FRAME_CONTEXT *const ec_ctx, aom_reader *r,
                           int *signs_out) {
  const int joint_sign =
      aom_read_symbol(r, ec_ctx->cfl_sign_cdf, CFL_JOINT_SIGNS, "cfl:signs");
  int idx = 0;
  // Magnitudes are only coded for nonzero values
  if (CFL_SIGN_U(joint_sign) != CFL_SIGN_ZERO) {
    aom_cdf_prob *cdf_u = ec_ctx->cfl_alpha_cdf[CFL_CONTEXT_U(joint_sign)];
    idx = aom_read_symbol(r, cdf_u, CFL_ALPHABET_SIZE, "cfl:alpha_u")
          << CFL_ALPHABET_SIZE_LOG2;
  }
  if (CFL_SIGN_V(joint_sign) != CFL_SIGN_ZERO) {
    aom_cdf_prob *cdf_v = ec_ctx->cfl_alpha_cdf[CFL_CONTEXT_V(joint_sign)];
    idx += aom_read_symbol(r, cdf_v, CFL_ALPHABET_SIZE, "cfl:alpha_v");
  }
  *signs_out = joint_sign;
  return idx;
}
#endif

static INTERINTRA_MODE read_interintra_mode(MACROBLOCKD *xd, aom_reader *r,
                                            int size_group) {
  const INTERINTRA_MODE ii_mode = (INTERINTRA_MODE)aom_read_symbol(
      r, xd->tile_ctx->interintra_mode_cdf[size_group], INTERINTRA_MODES,
      ACCT_STR);
  FRAME_COUNTS *counts = xd->counts;
  if (counts) ++counts->interintra_mode[size_group][ii_mode];
  return ii_mode;
}

static PREDICTION_MODE read_inter_mode(FRAME_CONTEXT *ec_ctx, MACROBLOCKD *xd,
                                       aom_reader *r, int16_t ctx) {
  FRAME_COUNTS *counts = xd->counts;
  int16_t mode_ctx = ctx & NEWMV_CTX_MASK;
  int is_newmv, is_zeromv, is_refmv;
  is_newmv = aom_read_symbol(r, ec_ctx->newmv_cdf[mode_ctx], 2, ACCT_STR) == 0;
  if (is_newmv) {
    if (counts) ++counts->newmv_mode[mode_ctx][0];
    return NEWMV;
  }
  if (counts) ++counts->newmv_mode[mode_ctx][1];
  if (ctx & (1 << ALL_ZERO_FLAG_OFFSET)) return GLOBALMV;
  mode_ctx = (ctx >> GLOBALMV_OFFSET) & GLOBALMV_CTX_MASK;
  is_zeromv =
      aom_read_symbol(r, ec_ctx->zeromv_cdf[mode_ctx], 2, ACCT_STR) == 0;
  if (is_zeromv) {
    if (counts) ++counts->zeromv_mode[mode_ctx][0];
    return GLOBALMV;
  }
  if (counts) ++counts->zeromv_mode[mode_ctx][1];
  mode_ctx = (ctx >> REFMV_OFFSET) & REFMV_CTX_MASK;
  if (ctx & (1 << SKIP_NEARESTMV_OFFSET)) mode_ctx = 6;
  if (ctx & (1 << SKIP_NEARMV_OFFSET)) mode_ctx = 7;
  if (ctx & (1 << SKIP_NEARESTMV_SUB8X8_OFFSET)) mode_ctx = 8;
  is_refmv = aom_read_symbol(r, ec_ctx->refmv_cdf[mode_ctx], 2, ACCT_STR) == 0;
  if (is_refmv) {
    if (counts) ++counts->refmv_mode[mode_ctx][0];
    return NEARESTMV;
  } else {
    if (counts) ++counts->refmv_mode[mode_ctx][1];
    return NEARMV;
  }
}

static void read_drl_idx(FRAME_CONTEXT *ec_ctx, MACROBLOCKD *xd,
                         MB_MODE_INFO *mbmi, aom_reader *r) {
  uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
  mbmi->ref_mv_idx = 0;
  if (mbmi->mode == NEWMV || mbmi->mode == NEW_NEWMV) {
    for (int idx = 0; idx < 2; ++idx) {
      if (xd->ref_mv_count[ref_frame_type] > idx + 1 || CONFIG_OPT_REF_MV) {
        uint8_t drl_ctx = av1_drl_ctx(xd->ref_mv_stack[ref_frame_type], idx);
        int drl_idx = aom_read_symbol(r, ec_ctx->drl_cdf[drl_ctx], 2, ACCT_STR);
        mbmi->ref_mv_idx = idx + drl_idx;
        if (xd->counts) ++xd->counts->drl_mode[drl_ctx][drl_idx];
        if (!drl_idx) return;
      }
    }
  }
  if (have_nearmv_in_inter_mode(mbmi->mode)) {
    // Offset the NEARESTMV mode.
    // TODO(jingning): Unify the two syntax decoding loops after the NEARESTMV
    // mode is factored in.
    for (int idx = 1; idx < 3; ++idx) {
      if (xd->ref_mv_count[ref_frame_type] > idx + 1 || CONFIG_OPT_REF_MV) {
        uint8_t drl_ctx = av1_drl_ctx(xd->ref_mv_stack[ref_frame_type], idx);
        int drl_idx = aom_read_symbol(r, ec_ctx->drl_cdf[drl_ctx], 2, ACCT_STR);
        mbmi->ref_mv_idx = idx + drl_idx - 1;
        if (xd->counts) ++xd->counts->drl_mode[drl_ctx][drl_idx];
        if (!drl_idx) return;
      }
    }
  }
}

#if CONFIG_EXT_WARPED_MOTION
static MOTION_MODE read_motion_mode(MACROBLOCKD *xd, MODE_INFO *mi,
                                    aom_reader *r, int best) {
#else
static MOTION_MODE read_motion_mode(MACROBLOCKD *xd, MODE_INFO *mi,
                                    aom_reader *r) {
#endif  // CONFIG_EXT_WARPED_MOTION
  MB_MODE_INFO *mbmi = &mi->mbmi;

#if CONFIG_EXT_SKIP
  if (mbmi->skip_mode) return SIMPLE_TRANSLATION;
#endif  // CONFIG_EXT_SKIP

  const MOTION_MODE last_motion_mode_allowed =
      motion_mode_allowed(xd->global_motion, xd, mi);
  int motion_mode;
  FRAME_COUNTS *counts = xd->counts;

  if (last_motion_mode_allowed == SIMPLE_TRANSLATION) return SIMPLE_TRANSLATION;

  if (last_motion_mode_allowed == OBMC_CAUSAL) {
    motion_mode =
        aom_read_symbol(r, xd->tile_ctx->obmc_cdf[mbmi->sb_type], 2, ACCT_STR);
    if (counts) ++counts->obmc[mbmi->sb_type][motion_mode];
    return (MOTION_MODE)(SIMPLE_TRANSLATION + motion_mode);
  } else {
#if CONFIG_EXT_WARPED_MOTION
    int wm_ctx = 0;
    if (best != -1) {
      wm_ctx = 1;
      if (mbmi->mode == NEARESTMV) wm_ctx = 2;
    }

    motion_mode =
        aom_read_symbol(r, xd->tile_ctx->motion_mode_cdf[wm_ctx][mbmi->sb_type],
                        MOTION_MODES, ACCT_STR);
    if (counts) ++counts->motion_mode[wm_ctx][mbmi->sb_type][motion_mode];
#else
    motion_mode =
        aom_read_symbol(r, xd->tile_ctx->motion_mode_cdf[mbmi->sb_type],
                        MOTION_MODES, ACCT_STR);
    if (counts) ++counts->motion_mode[mbmi->sb_type][motion_mode];
#endif  // CONFIG_EXT_WARPED_MOTION

    return (MOTION_MODE)(SIMPLE_TRANSLATION + motion_mode);
  }
}

static PREDICTION_MODE read_inter_compound_mode(AV1_COMMON *cm, MACROBLOCKD *xd,
                                                aom_reader *r, int16_t ctx) {
  (void)cm;
  const int mode =
      aom_read_symbol(r, xd->tile_ctx->inter_compound_mode_cdf[ctx],
                      INTER_COMPOUND_MODES, ACCT_STR);
  FRAME_COUNTS *counts = xd->counts;
  if (counts) ++counts->inter_compound_mode[ctx][mode];
  assert(is_inter_compound_mode(NEAREST_NEARESTMV + mode));
  return NEAREST_NEARESTMV + mode;
}

#if CONFIG_SPATIAL_SEGMENTATION
static int neg_deinterleave(int diff, int ref, int max) {
  if (!ref) return diff;
  if (ref >= (max - 1)) return max - diff - 1;
  if (2 * ref < max) {
    if (diff <= 2 * ref) {
      if (diff & 1)
        return ref + ((diff + 1) >> 1);
      else
        return ref - (diff >> 1);
    }
    return diff;
  } else {
    if (diff <= 2 * (max - ref - 1)) {
      if (diff & 1)
        return ref + ((diff + 1) >> 1);
      else
        return ref - (diff >> 1);
    }
    return max - (diff + 1);
  }
}

static int read_segment_id(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                           int mi_row, int mi_col, aom_reader *r, int skip) {
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  struct segmentation_probs *const segp = &ec_ctx->seg;
  int prev_ul = 0; /* Top left segment_id */
  int prev_l = 0;  /* Current left segment_id */
  int prev_u = 0;  /* Current top segment_id */

  MODE_INFO *const mi = cm->mi + mi_row * cm->mi_stride + mi_col;
  int tinfo = mi->mbmi.boundary_info;
  int above = (!(tinfo & TILE_ABOVE_BOUNDARY)) && ((mi_row - 1) >= 0);
  int left = (!(tinfo & TILE_LEFT_BOUNDARY)) && ((mi_col - 1) >= 0);

  if (above && left)
    prev_ul = get_segment_id(cm, cm->current_frame_seg_map, BLOCK_4X4,
                             mi_row - 1, mi_col - 1);

  if (above)
    prev_u = get_segment_id(cm, cm->current_frame_seg_map, BLOCK_4X4,
                            mi_row - 1, mi_col - 0);

  if (left)
    prev_l = get_segment_id(cm, cm->current_frame_seg_map, BLOCK_4X4,
                            mi_row - 0, mi_col - 1);

  int cdf_num = pick_spatial_seg_cdf(prev_ul, prev_u, prev_l);
  int pred = pick_spatial_seg_pred(prev_ul, prev_u, prev_l);

  if (skip) return pred;

  aom_cdf_prob *pred_cdf = segp->spatial_pred_seg_cdf[cdf_num];
  int coded_id = aom_read_symbol(r, pred_cdf, 8, ACCT_STR);

  int segment_id = neg_deinterleave(coded_id, pred, cm->last_active_segid + 1);

  assert(segment_id >= 0 && segment_id <= cm->last_active_segid);

  return segment_id;
}
#else
static int read_segment_id(aom_reader *r, struct segmentation_probs *segp) {
  return aom_read_symbol(r, segp->tree_cdf, MAX_SEGMENTS, ACCT_STR);
}
#endif

static void read_tx_size_vartx(AV1_COMMON *cm, MACROBLOCKD *xd,
                               MB_MODE_INFO *mbmi, FRAME_COUNTS *counts,
                               TX_SIZE tx_size, int depth, int blk_row,
                               int blk_col, aom_reader *r) {
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  (void)cm;
  int is_split = 0;
  const int tx_row = blk_row >> 1;
  const int tx_col = blk_col >> 1;
  const int max_blocks_high = max_block_high(xd, mbmi->sb_type, 0);
  const int max_blocks_wide = max_block_wide(xd, mbmi->sb_type, 0);
  int ctx = txfm_partition_context(xd->above_txfm_context + blk_col,
                                   xd->left_txfm_context + blk_row,
                                   mbmi->sb_type, tx_size);
  TX_SIZE(*const inter_tx_size)
  [MAX_MIB_SIZE] =
      (TX_SIZE(*)[MAX_MIB_SIZE]) & mbmi->inter_tx_size[tx_row][tx_col];
  if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide) return;
  assert(tx_size > TX_4X4);

  if (depth == MAX_VARTX_DEPTH) {
    int idx, idy;
    inter_tx_size[0][0] = tx_size;
    for (idy = 0; idy < AOMMAX(1, tx_size_high_unit[tx_size] / 2); ++idy)
      for (idx = 0; idx < AOMMAX(1, tx_size_wide_unit[tx_size] / 2); ++idx)
        inter_tx_size[idy][idx] = tx_size;
    mbmi->tx_size = tx_size;
    mbmi->min_tx_size = AOMMIN(mbmi->min_tx_size, get_min_tx_size(tx_size));
    txfm_partition_update(xd->above_txfm_context + blk_col,
                          xd->left_txfm_context + blk_row, tx_size, tx_size);
    return;
  }

  is_split = aom_read_symbol(r, ec_ctx->txfm_partition_cdf[ctx], 2, ACCT_STR);

  if (is_split) {
    const TX_SIZE sub_txs = sub_tx_size_map[1][tx_size];
    const int bsw = tx_size_wide_unit[sub_txs];
    const int bsh = tx_size_high_unit[sub_txs];

    if (counts) ++counts->txfm_partition[ctx][1];

    if (sub_txs == TX_4X4) {
      int idx, idy;
      inter_tx_size[0][0] = sub_txs;
      for (idy = 0; idy < AOMMAX(1, tx_size_high_unit[tx_size] / 2); ++idy)
        for (idx = 0; idx < AOMMAX(1, tx_size_wide_unit[tx_size] / 2); ++idx)
          inter_tx_size[idy][idx] = inter_tx_size[0][0];
      mbmi->tx_size = sub_txs;
      mbmi->min_tx_size = get_min_tx_size(mbmi->tx_size);
      txfm_partition_update(xd->above_txfm_context + blk_col,
                            xd->left_txfm_context + blk_row, sub_txs, tx_size);
      return;
    }

    assert(bsw > 0 && bsh > 0);
    for (int row = 0; row < tx_size_high_unit[tx_size]; row += bsh) {
      for (int col = 0; col < tx_size_wide_unit[tx_size]; col += bsw) {
        int offsetr = blk_row + row;
        int offsetc = blk_col + col;
        read_tx_size_vartx(cm, xd, mbmi, counts, sub_txs, depth + 1, offsetr,
                           offsetc, r);
      }
    }
  } else {
    int idx, idy;
    inter_tx_size[0][0] = tx_size;
    for (idy = 0; idy < AOMMAX(1, tx_size_high_unit[tx_size] / 2); ++idy)
      for (idx = 0; idx < AOMMAX(1, tx_size_wide_unit[tx_size] / 2); ++idx)
        inter_tx_size[idy][idx] = tx_size;
    mbmi->tx_size = tx_size;
    mbmi->min_tx_size = AOMMIN(mbmi->min_tx_size, get_min_tx_size(tx_size));
    if (counts) ++counts->txfm_partition[ctx][0];
    txfm_partition_update(xd->above_txfm_context + blk_col,
                          xd->left_txfm_context + blk_row, tx_size, tx_size);
  }
}

static TX_SIZE read_selected_tx_size(AV1_COMMON *cm, MACROBLOCKD *xd,
                                     int is_inter, aom_reader *r) {
  // TODO(debargha): Clean up the logic here. This function should only
  // be called for intra.
  const BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
  const int32_t tx_size_cat = bsize_to_tx_size_cat(bsize, is_inter);
  const int max_depths = bsize_to_max_depth(bsize, 0);
  const int ctx = get_tx_size_context(xd);
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  (void)cm;

  const int depth = aom_read_symbol(r, ec_ctx->tx_size_cdf[tx_size_cat][ctx],
                                    max_depths + 1, ACCT_STR);
  assert(depth >= 0 && depth <= max_depths);
  const TX_SIZE tx_size = depth_to_tx_size(depth, bsize, 0);
  return tx_size;
}

static TX_SIZE read_tx_size(AV1_COMMON *cm, MACROBLOCKD *xd, int is_inter,
                            int allow_select_inter, aom_reader *r) {
  const TX_MODE tx_mode = cm->tx_mode;
  const BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
  if (xd->lossless[xd->mi[0]->mbmi.segment_id]) return TX_4X4;

  if (block_signals_txsize(bsize)) {
    if ((!is_inter || allow_select_inter) && tx_mode == TX_MODE_SELECT) {
      const TX_SIZE coded_tx_size = read_selected_tx_size(cm, xd, is_inter, r);
      return coded_tx_size;
    } else {
      return tx_size_from_tx_mode(bsize, tx_mode, is_inter);
    }
  } else {
    assert(IMPLIES(tx_mode == ONLY_4X4, bsize == BLOCK_4X4));
    return get_max_rect_tx_size(bsize, is_inter);
  }
}

static int dec_get_segment_id(const AV1_COMMON *cm, const uint8_t *segment_ids,
                              int mi_offset, int x_mis, int y_mis) {
  int segment_id = INT_MAX;

  for (int y = 0; y < y_mis; y++)
    for (int x = 0; x < x_mis; x++)
      segment_id =
          AOMMIN(segment_id, segment_ids[mi_offset + y * cm->mi_cols + x]);

  assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);
  return segment_id;
}

static void set_segment_id(AV1_COMMON *cm, int mi_offset, int x_mis, int y_mis,
                           int segment_id) {
  assert(segment_id >= 0 && segment_id < MAX_SEGMENTS);

  for (int y = 0; y < y_mis; y++)
    for (int x = 0; x < x_mis; x++)
      cm->current_frame_seg_map[mi_offset + y * cm->mi_cols + x] = segment_id;
}

static int read_intra_segment_id(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                 MB_MODE_INFO *const mbmi, int mi_row,
                                 int mi_col, int bsize, int preskip,
                                 aom_reader *r) {
  struct segmentation *const seg = &cm->seg;
  const int mi_offset = mi_row * cm->mi_cols + mi_col;
  const int bw = mi_size_wide[bsize];
  const int bh = mi_size_high[bsize];
  const int x_mis = AOMMIN(cm->mi_cols - mi_col, bw);
  const int y_mis = AOMMIN(cm->mi_rows - mi_row, bh);

  if (!seg->enabled) return 0;  // Default for disabled segmentation

  assert(seg->update_map && !seg->temporal_update);

#if CONFIG_SPATIAL_SEGMENTATION
  if (preskip) {
    if (!cm->preskip_segid) return 0;
  } else {
    if (cm->preskip_segid) return mbmi->segment_id;
  }
  const int segment_id =
      read_segment_id(cm, xd, mi_row, mi_col, r, preskip ? 0 : mbmi->skip);
#else
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  (void)preskip;
  (void)mbmi;
  const int segment_id = read_segment_id(r, &ec_ctx->seg);
#endif
  FRAME_COUNTS *counts = xd->counts;
  if (counts) ++counts->seg.tree_total[segment_id];
  set_segment_id(cm, mi_offset, x_mis, y_mis, segment_id);
  return segment_id;
}

static void copy_segment_id(const AV1_COMMON *cm,
                            const uint8_t *last_segment_ids,
                            uint8_t *current_segment_ids, int mi_offset,
                            int x_mis, int y_mis) {
  for (int y = 0; y < y_mis; y++)
    for (int x = 0; x < x_mis; x++)
      current_segment_ids[mi_offset + y * cm->mi_cols + x] =
          last_segment_ids ? last_segment_ids[mi_offset + y * cm->mi_cols + x]
                           : 0;
}

static int read_inter_segment_id(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                 int mi_row, int mi_col, int preskip,
                                 aom_reader *r) {
  struct segmentation *const seg = &cm->seg;
  FRAME_COUNTS *counts = xd->counts;
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  struct segmentation_probs *const segp = &ec_ctx->seg;

  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  int predicted_segment_id, segment_id;
  const int mi_offset = mi_row * cm->mi_cols + mi_col;
  const int bw = mi_size_wide[mbmi->sb_type];
  const int bh = mi_size_high[mbmi->sb_type];

  // TODO(slavarnway): move x_mis, y_mis into xd ?????
  const int x_mis = AOMMIN(cm->mi_cols - mi_col, bw);
  const int y_mis = AOMMIN(cm->mi_rows - mi_row, bh);

  if (!seg->enabled) return 0;  // Default for disabled segmentation

  predicted_segment_id = cm->last_frame_seg_map
                             ? dec_get_segment_id(cm, cm->last_frame_seg_map,
                                                  mi_offset, x_mis, y_mis)
                             : 0;

  if (!seg->update_map) {
    copy_segment_id(cm, cm->last_frame_seg_map, cm->current_frame_seg_map,
                    mi_offset, x_mis, y_mis);
    return predicted_segment_id;
  }

#if CONFIG_SPATIAL_SEGMENTATION
  if (preskip) {
    if (!cm->preskip_segid) return 0;
  } else {
    if (cm->preskip_segid) return mbmi->segment_id;
    if (mbmi->skip) {
      if (seg->temporal_update) {
        const int ctx = av1_get_pred_context_seg_id(xd);
        mbmi->seg_id_predicted = 0;
        if (counts) ++counts->seg.pred[ctx][mbmi->seg_id_predicted];
      }
      segment_id = read_segment_id(cm, xd, mi_row, mi_col, r, 0);
      if (counts) ++counts->seg.tree_total[segment_id];
      set_segment_id(cm, mi_offset, x_mis, y_mis, segment_id);
      return segment_id;
    }
  }
#endif
  (void)preskip;
  if (seg->temporal_update) {
    const int ctx = av1_get_pred_context_seg_id(xd);
    aom_cdf_prob *pred_cdf = segp->pred_cdf[ctx];
    mbmi->seg_id_predicted = aom_read_symbol(r, pred_cdf, 2, ACCT_STR);
    if (counts) ++counts->seg.pred[ctx][mbmi->seg_id_predicted];
    if (mbmi->seg_id_predicted) {
      segment_id = predicted_segment_id;
    } else {
#if CONFIG_SPATIAL_SEGMENTATION
      segment_id = read_segment_id(cm, xd, mi_row, mi_col, r, 0);
#else
      segment_id = read_segment_id(r, segp);
#endif
      if (counts) ++counts->seg.tree_mispred[segment_id];
    }
  } else {
#if CONFIG_SPATIAL_SEGMENTATION
    segment_id = read_segment_id(cm, xd, mi_row, mi_col, r, 0);
#else
    segment_id = read_segment_id(r, segp);
#endif
    if (counts) ++counts->seg.tree_total[segment_id];
  }
  set_segment_id(cm, mi_offset, x_mis, y_mis, segment_id);
  return segment_id;
}

#if CONFIG_EXT_SKIP
static int read_skip_mode(AV1_COMMON *cm, const MACROBLOCKD *xd, int segment_id,
                          aom_reader *r) {
  if (!cm->skip_mode_flag) return 0;

  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
    // TODO(zoeliu): To revisit the handling of this scenario.
    return 0;
  }

  if (!is_comp_ref_allowed(xd->mi[0]->mbmi.sb_type)) return 0;

  const int ctx = av1_get_skip_mode_context(xd);
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  const int skip_mode =
      aom_read_symbol(r, ec_ctx->skip_mode_cdfs[ctx], 2, ACCT_STR);
  FRAME_COUNTS *counts = xd->counts;
  if (counts) ++counts->skip_mode[ctx][skip_mode];

  return skip_mode;
}
#endif  // CONFIG_EXT_SKIP

static int read_skip(AV1_COMMON *cm, const MACROBLOCKD *xd, int segment_id,
                     aom_reader *r) {
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP)) {
    return 1;
  } else {
    const int ctx = av1_get_skip_context(xd);
    FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
    const int skip = aom_read_symbol(r, ec_ctx->skip_cdfs[ctx], 2, ACCT_STR);
    FRAME_COUNTS *counts = xd->counts;
    if (counts) ++counts->skip[ctx][skip];
    return skip;
  }
}

// Merge the sorted list of cached colors(cached_colors[0...n_cached_colors-1])
// and the sorted list of transmitted colors(colors[n_cached_colors...n-1]) into
// one single sorted list(colors[...]).
static void merge_colors(uint16_t *colors, uint16_t *cached_colors,
                         int n_colors, int n_cached_colors) {
  if (n_cached_colors == 0) return;
  int cache_idx = 0, trans_idx = n_cached_colors;
  for (int i = 0; i < n_colors; ++i) {
    if (cache_idx < n_cached_colors &&
        (trans_idx >= n_colors ||
         cached_colors[cache_idx] <= colors[trans_idx])) {
      colors[i] = cached_colors[cache_idx++];
    } else {
      assert(trans_idx < n_colors);
      colors[i] = colors[trans_idx++];
    }
  }
}

static void read_palette_colors_y(MACROBLOCKD *const xd, int bit_depth,
                                  PALETTE_MODE_INFO *const pmi, aom_reader *r) {
  uint16_t color_cache[2 * PALETTE_MAX_SIZE];
  uint16_t cached_colors[PALETTE_MAX_SIZE];
  const int n_cache = av1_get_palette_cache(xd, 0, color_cache);
  const int n = pmi->palette_size[0];
  int idx = 0;
  for (int i = 0; i < n_cache && idx < n; ++i)
    if (aom_read_bit(r, ACCT_STR)) cached_colors[idx++] = color_cache[i];
  if (idx < n) {
    const int n_cached_colors = idx;
    pmi->palette_colors[idx++] = aom_read_literal(r, bit_depth, ACCT_STR);
    if (idx < n) {
      const int min_bits = bit_depth - 3;
      int bits = min_bits + aom_read_literal(r, 2, ACCT_STR);
      int range = (1 << bit_depth) - pmi->palette_colors[idx - 1] - 1;
      for (; idx < n; ++idx) {
        assert(range >= 0);
        const int delta = aom_read_literal(r, bits, ACCT_STR) + 1;
        pmi->palette_colors[idx] = clamp(pmi->palette_colors[idx - 1] + delta,
                                         0, (1 << bit_depth) - 1);
        range -= (pmi->palette_colors[idx] - pmi->palette_colors[idx - 1]);
        bits = AOMMIN(bits, av1_ceil_log2(range));
      }
    }
    merge_colors(pmi->palette_colors, cached_colors, n, n_cached_colors);
  } else {
    memcpy(pmi->palette_colors, cached_colors, n * sizeof(cached_colors[0]));
  }
}

static void read_palette_colors_uv(MACROBLOCKD *const xd, int bit_depth,
                                   PALETTE_MODE_INFO *const pmi,
                                   aom_reader *r) {
  const int n = pmi->palette_size[1];
  // U channel colors.
  uint16_t color_cache[2 * PALETTE_MAX_SIZE];
  uint16_t cached_colors[PALETTE_MAX_SIZE];
  const int n_cache = av1_get_palette_cache(xd, 1, color_cache);
  int idx = 0;
  for (int i = 0; i < n_cache && idx < n; ++i)
    if (aom_read_bit(r, ACCT_STR)) cached_colors[idx++] = color_cache[i];
  if (idx < n) {
    const int n_cached_colors = idx;
    idx += PALETTE_MAX_SIZE;
    pmi->palette_colors[idx++] = aom_read_literal(r, bit_depth, ACCT_STR);
    if (idx < PALETTE_MAX_SIZE + n) {
      const int min_bits = bit_depth - 3;
      int bits = min_bits + aom_read_literal(r, 2, ACCT_STR);
      int range = (1 << bit_depth) - pmi->palette_colors[idx - 1];
      for (; idx < PALETTE_MAX_SIZE + n; ++idx) {
        assert(range >= 0);
        const int delta = aom_read_literal(r, bits, ACCT_STR);
        pmi->palette_colors[idx] = clamp(pmi->palette_colors[idx - 1] + delta,
                                         0, (1 << bit_depth) - 1);
        range -= (pmi->palette_colors[idx] - pmi->palette_colors[idx - 1]);
        bits = AOMMIN(bits, av1_ceil_log2(range));
      }
    }
    merge_colors(pmi->palette_colors + PALETTE_MAX_SIZE, cached_colors, n,
                 n_cached_colors);
  } else {
    memcpy(pmi->palette_colors + PALETTE_MAX_SIZE, cached_colors,
           n * sizeof(cached_colors[0]));
  }

  // V channel colors.
  if (aom_read_bit(r, ACCT_STR)) {  // Delta encoding.
    const int min_bits_v = bit_depth - 4;
    const int max_val = 1 << bit_depth;
    int bits = min_bits_v + aom_read_literal(r, 2, ACCT_STR);
    pmi->palette_colors[2 * PALETTE_MAX_SIZE] =
        aom_read_literal(r, bit_depth, ACCT_STR);
    for (int i = 1; i < n; ++i) {
      int delta = aom_read_literal(r, bits, ACCT_STR);
      if (delta && aom_read_bit(r, ACCT_STR)) delta = -delta;
      int val = (int)pmi->palette_colors[2 * PALETTE_MAX_SIZE + i - 1] + delta;
      if (val < 0) val += max_val;
      if (val >= max_val) val -= max_val;
      pmi->palette_colors[2 * PALETTE_MAX_SIZE + i] = val;
    }
  } else {
    for (int i = 0; i < n; ++i) {
      pmi->palette_colors[2 * PALETTE_MAX_SIZE + i] =
          aom_read_literal(r, bit_depth, ACCT_STR);
    }
  }
}

static void read_palette_mode_info(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                   aom_reader *r) {
  MODE_INFO *const mi = xd->mi[0];
  MB_MODE_INFO *const mbmi = &mi->mbmi;
  const MODE_INFO *const above_mi = xd->above_mi;
  const MODE_INFO *const left_mi = xd->left_mi;
  const BLOCK_SIZE bsize = mbmi->sb_type;
  assert(av1_allow_palette(cm->allow_screen_content_tools, bsize));
  PALETTE_MODE_INFO *const pmi = &mbmi->palette_mode_info;
  const int block_palette_idx = bsize - BLOCK_8X8;

  if (mbmi->mode == DC_PRED) {
    int palette_y_mode_ctx = 0;
    if (above_mi) {
      palette_y_mode_ctx +=
          (above_mi->mbmi.palette_mode_info.palette_size[0] > 0);
    }
    if (left_mi) {
      palette_y_mode_ctx +=
          (left_mi->mbmi.palette_mode_info.palette_size[0] > 0);
    }
    const int modev = aom_read_symbol(
        r,
        xd->tile_ctx->palette_y_mode_cdf[block_palette_idx][palette_y_mode_ctx],
        2, ACCT_STR);
    if (modev) {
      pmi->palette_size[0] =
          aom_read_symbol(r,
                          xd->tile_ctx->palette_y_size_cdf[block_palette_idx],
                          PALETTE_SIZES, ACCT_STR) +
          2;
      read_palette_colors_y(xd, cm->bit_depth, pmi, r);
    }
  }
  if (mbmi->uv_mode == UV_DC_PRED) {
    const int palette_uv_mode_ctx = (pmi->palette_size[0] > 0);
    const int modev = aom_read_symbol(
        r, xd->tile_ctx->palette_uv_mode_cdf[palette_uv_mode_ctx], 2, ACCT_STR);
    if (modev) {
      pmi->palette_size[1] =
          aom_read_symbol(r,
                          xd->tile_ctx->palette_uv_size_cdf[block_palette_idx],
                          PALETTE_SIZES, ACCT_STR) +
          2;
      read_palette_colors_uv(xd, cm->bit_depth, pmi, r);
    }
  }
}

#if CONFIG_FILTER_INTRA
static void read_filter_intra_mode_info(MACROBLOCKD *const xd, aom_reader *r) {
  MODE_INFO *const mi = xd->mi[0];
  MB_MODE_INFO *const mbmi = &mi->mbmi;
  FILTER_INTRA_MODE_INFO *filter_intra_mode_info =
      &mbmi->filter_intra_mode_info;

  if (mbmi->mode == DC_PRED && mbmi->palette_mode_info.palette_size[0] == 0 &&
      av1_filter_intra_allowed_txsize(mbmi->tx_size)) {
    filter_intra_mode_info->use_filter_intra_mode[0] = aom_read_symbol(
        r, xd->tile_ctx->filter_intra_cdfs[mbmi->tx_size], 2, ACCT_STR);
    if (filter_intra_mode_info->use_filter_intra_mode[0]) {
      filter_intra_mode_info->filter_intra_mode[0] =
          aom_read_symbol(r, xd->tile_ctx->filter_intra_mode_cdf[0],
                          FILTER_INTRA_MODES, ACCT_STR);
    }
  }
}
#endif  // CONFIG_FILTER_INTRA

#if CONFIG_EXT_INTRA
#if CONFIG_EXT_INTRA_MOD
static int read_angle_delta(aom_reader *r, aom_cdf_prob *cdf) {
  const int sym = aom_read_symbol(r, cdf, 2 * MAX_ANGLE_DELTA + 1, ACCT_STR);
  return sym - MAX_ANGLE_DELTA;
}
#endif  // CONFIG_EXT_INTRA_MOD

static void read_intra_angle_info(MACROBLOCKD *const xd, aom_reader *r) {
  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  const BLOCK_SIZE bsize = mbmi->sb_type;
#if CONFIG_EXT_INTRA_MOD
  FRAME_CONTEXT *const ec_ctx = xd->tile_ctx;
#endif  // CONFIG_EXT_INTRA_MOD

  mbmi->angle_delta[0] = 0;
  mbmi->angle_delta[1] = 0;
  if (!av1_use_angle_delta(bsize)) return;

  if (av1_is_directional_mode(mbmi->mode, bsize)) {
#if CONFIG_EXT_INTRA_MOD
    mbmi->angle_delta[0] =
        read_angle_delta(r, ec_ctx->angle_delta_cdf[mbmi->mode - V_PRED]);
#else
    mbmi->angle_delta[0] =
        av1_read_uniform(r, 2 * MAX_ANGLE_DELTA + 1) - MAX_ANGLE_DELTA;
#endif  // CONFIG_EXT_INTRA_MOD
  }

  if (av1_is_directional_mode(get_uv_mode(mbmi->uv_mode), bsize)) {
#if CONFIG_EXT_INTRA_MOD
    mbmi->angle_delta[1] =
        read_angle_delta(r, ec_ctx->angle_delta_cdf[mbmi->uv_mode - V_PRED]);
#else
    mbmi->angle_delta[1] =
        av1_read_uniform(r, 2 * MAX_ANGLE_DELTA + 1) - MAX_ANGLE_DELTA;
#endif  // CONFIG_EXT_INTRA_MOD
  }
}
#endif  // CONFIG_EXT_INTRA

void av1_read_tx_type(const AV1_COMMON *const cm, MACROBLOCKD *xd,
#if CONFIG_TXK_SEL
                      int blk_row, int blk_col, int plane, TX_SIZE tx_size,
#endif
                      aom_reader *r) {
  MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
  const int inter_block = is_inter_block(mbmi);
#if !CONFIG_TXK_SEL
  const TX_SIZE mtx_size =
      get_max_rect_tx_size(xd->mi[0]->mbmi.sb_type, inter_block);
  const TX_SIZE tx_size =
      inter_block ? AOMMAX(sub_tx_size_map[1][mtx_size], mbmi->min_tx_size)
                  : mbmi->tx_size;
#endif  // !CONFIG_TXK_SEL
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;

#if !CONFIG_TXK_SEL
  TX_TYPE *tx_type = &mbmi->tx_type;
#else
  // only y plane's tx_type is transmitted
  if (plane > 0) return;
  TX_TYPE *tx_type = &mbmi->txk_type[(blk_row << MAX_MIB_SIZE_LOG2) + blk_col];
#endif

  if (!FIXED_TX_TYPE) {
    const TX_SIZE square_tx_size = txsize_sqr_map[tx_size];
    if (get_ext_tx_types(tx_size, mbmi->sb_type, inter_block,
                         cm->reduced_tx_set_used) > 1 &&
        ((!cm->seg.enabled && cm->base_qindex > 0) ||
         (cm->seg.enabled && xd->qindex[mbmi->segment_id] > 0)) &&
        !mbmi->skip &&
        !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
      const TxSetType tx_set_type = get_ext_tx_set_type(
          tx_size, mbmi->sb_type, inter_block, cm->reduced_tx_set_used);
      const int eset = get_ext_tx_set(tx_size, mbmi->sb_type, inter_block,
                                      cm->reduced_tx_set_used);
      // eset == 0 should correspond to a set with only DCT_DCT and
      // there is no need to read the tx_type
      assert(eset != 0);

      if (inter_block) {
        *tx_type = av1_ext_tx_inv[tx_set_type][aom_read_symbol(
            r, ec_ctx->inter_ext_tx_cdf[eset][square_tx_size],
            av1_num_ext_tx_set[tx_set_type], ACCT_STR)];
      } else if (ALLOW_INTRA_EXT_TX) {
#if CONFIG_FILTER_INTRA
        PREDICTION_MODE intra_dir;
        if (mbmi->filter_intra_mode_info.use_filter_intra_mode[0])
          intra_dir = fimode_to_intradir[mbmi->filter_intra_mode_info
                                             .filter_intra_mode[0]];
        else
          intra_dir = mbmi->mode;
        *tx_type = av1_ext_tx_inv[tx_set_type][aom_read_symbol(
            r, ec_ctx->intra_ext_tx_cdf[eset][square_tx_size][intra_dir],
            av1_num_ext_tx_set[tx_set_type], ACCT_STR)];
#else
        *tx_type = av1_ext_tx_inv[tx_set_type][aom_read_symbol(
            r, ec_ctx->intra_ext_tx_cdf[eset][square_tx_size][mbmi->mode],
            av1_num_ext_tx_set[tx_set_type], ACCT_STR)];
#endif
      }
    } else {
      *tx_type = DCT_DCT;
    }
  }
#if FIXED_TX_TYPE
  assert(mbmi->tx_type == DCT_DCT);
#endif
}

#if CONFIG_INTRABC
static INLINE void read_mv(aom_reader *r, MV *mv, const MV *ref,
                           nmv_context *ctx, MvSubpelPrecision precision);

static INLINE int is_mv_valid(const MV *mv);

static INLINE int assign_dv(AV1_COMMON *cm, MACROBLOCKD *xd, int_mv *mv,
                            const int_mv *ref_mv, int mi_row, int mi_col,
                            BLOCK_SIZE bsize, aom_reader *r) {
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  read_mv(r, &mv->as_mv, &ref_mv->as_mv, &ec_ctx->ndvc, MV_SUBPEL_NONE);
  // DV should not have sub-pel.
  assert((mv->as_mv.col & 7) == 0);
  assert((mv->as_mv.row & 7) == 0);
  mv->as_mv.col = (mv->as_mv.col >> 3) * 8;
  mv->as_mv.row = (mv->as_mv.row >> 3) * 8;
  int valid = is_mv_valid(&mv->as_mv) &&
              av1_is_dv_valid(mv->as_mv, &xd->tile, mi_row, mi_col, bsize,
                              cm->mib_size_log2);
  return valid;
}
#endif  // CONFIG_INTRABC

#if CONFIG_INTRABC
static void read_intrabc_info(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                              int mi_row, int mi_col, aom_reader *r) {
  MODE_INFO *const mi = xd->mi[0];
  MB_MODE_INFO *const mbmi = &mi->mbmi;
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  mbmi->use_intrabc = aom_read_symbol(r, ec_ctx->intrabc_cdf, 2, ACCT_STR);
  if (mbmi->use_intrabc) {
    const BLOCK_SIZE bsize = mbmi->sb_type;
    const int width = block_size_wide[bsize] >> tx_size_wide_log2[0];
    const int height = block_size_high[bsize] >> tx_size_high_log2[0];
    if ((cm->tx_mode == TX_MODE_SELECT && block_signals_txsize(bsize) &&
         !xd->lossless[mbmi->segment_id] && !mbmi->skip)) {
      const TX_SIZE max_tx_size = get_max_rect_tx_size(bsize, 0);
      const int bh = tx_size_high_unit[max_tx_size];
      const int bw = tx_size_wide_unit[max_tx_size];
      mbmi->min_tx_size = TX_SIZES_ALL;
      for (int idy = 0; idy < height; idy += bh) {
        for (int idx = 0; idx < width; idx += bw) {
          read_tx_size_vartx(cm, xd, mbmi, xd->counts, max_tx_size, 0, idy, idx,
                             r);
        }
      }
    } else {
      mbmi->tx_size = read_tx_size(cm, xd, 1, !mbmi->skip, r);
      for (int idy = 0; idy < height; ++idy)
        for (int idx = 0; idx < width; ++idx)
          mbmi->inter_tx_size[idy >> 1][idx >> 1] = mbmi->tx_size;
      mbmi->min_tx_size = get_min_tx_size(mbmi->tx_size);
      set_txfm_ctxs(mbmi->tx_size, xd->n8_w, xd->n8_h, mbmi->skip, xd);
    }
    mbmi->mode = mbmi->uv_mode = UV_DC_PRED;
    mbmi->interp_filters = av1_broadcast_interp_filter(BILINEAR);

    int16_t inter_mode_ctx[MODE_CTX_REF_FRAMES];
    int_mv ref_mvs[MAX_MV_REF_CANDIDATES];

    av1_find_mv_refs(cm, xd, mi, INTRA_FRAME, &xd->ref_mv_count[INTRA_FRAME],
                     xd->ref_mv_stack[INTRA_FRAME], NULL, ref_mvs, mi_row,
                     mi_col, NULL, NULL, inter_mode_ctx);

    int_mv nearestmv, nearmv;

#if CONFIG_AMVR
    av1_find_best_ref_mvs(0, ref_mvs, &nearestmv, &nearmv, 0);
#else
    av1_find_best_ref_mvs(0, ref_mvs, &nearestmv, &nearmv);
#endif
    int_mv dv_ref = nearestmv.as_int == 0 ? nearmv : nearestmv;
    if (dv_ref.as_int == 0)
      av1_find_ref_dv(&dv_ref, &xd->tile, cm->mib_size, mi_row, mi_col);
    // Ref DV should not have sub-pel.
    assert((dv_ref.as_mv.col & 7) == 0);
    assert((dv_ref.as_mv.row & 7) == 0);
    dv_ref.as_mv.col = (dv_ref.as_mv.col >> 3) * 8;
    dv_ref.as_mv.row = (dv_ref.as_mv.row >> 3) * 8;
    xd->corrupted |=
        !assign_dv(cm, xd, &mbmi->mv[0], &dv_ref, mi_row, mi_col, bsize, r);
#if !CONFIG_TXK_SEL
    av1_read_tx_type(cm, xd, r);
#endif  // !CONFIG_TXK_SEL
  }
}
#endif  // CONFIG_INTRABC

static void read_intra_frame_mode_info(AV1_COMMON *const cm,
                                       MACROBLOCKD *const xd, int mi_row,
                                       int mi_col, aom_reader *r) {
  MODE_INFO *const mi = xd->mi[0];
  MB_MODE_INFO *const mbmi = &mi->mbmi;
  const MODE_INFO *above_mi = xd->above_mi;
  const MODE_INFO *left_mi = xd->left_mi;
  const BLOCK_SIZE bsize = mbmi->sb_type;

  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;

  mbmi->segment_id =
      read_intra_segment_id(cm, xd, mbmi, mi_row, mi_col, bsize, 1, r);
  mbmi->skip = read_skip(cm, xd, mbmi->segment_id, r);

#if CONFIG_SPATIAL_SEGMENTATION
  mbmi->segment_id =
      read_intra_segment_id(cm, xd, mbmi, mi_row, mi_col, bsize, 0, r);
#endif

  read_cdef(cm, r, mbmi, mi_col, mi_row);

  if (cm->delta_q_present_flag) {
    xd->current_qindex =
        xd->prev_qindex +
        read_delta_qindex(cm, xd, r, mbmi, mi_col, mi_row) * cm->delta_q_res;
    /* Normative: Clamp to [1,MAXQ] to not interfere with lossless mode */
    xd->current_qindex = clamp(xd->current_qindex, 1, MAXQ);
    xd->prev_qindex = xd->current_qindex;
#if CONFIG_EXT_DELTA_Q
    if (cm->delta_lf_present_flag) {
#if CONFIG_LOOPFILTER_LEVEL
      if (cm->delta_lf_multi) {
        for (int lf_id = 0; lf_id < FRAME_LF_COUNT; ++lf_id) {
          const int tmp_lvl =
              xd->prev_delta_lf[lf_id] +
              read_delta_lflevel(cm, xd, r, lf_id, mbmi, mi_col, mi_row) *
                  cm->delta_lf_res;
          mbmi->curr_delta_lf[lf_id] = xd->curr_delta_lf[lf_id] =
              clamp(tmp_lvl, -MAX_LOOP_FILTER, MAX_LOOP_FILTER);
          xd->prev_delta_lf[lf_id] = xd->curr_delta_lf[lf_id];
        }
      } else {
        const int tmp_lvl =
            xd->prev_delta_lf_from_base +
            read_delta_lflevel(cm, xd, r, -1, mbmi, mi_col, mi_row) *
                cm->delta_lf_res;
        mbmi->current_delta_lf_from_base = xd->current_delta_lf_from_base =
            clamp(tmp_lvl, -MAX_LOOP_FILTER, MAX_LOOP_FILTER);
        xd->prev_delta_lf_from_base = xd->current_delta_lf_from_base;
      }
#else
      const int current_delta_lf_from_base =
          xd->prev_delta_lf_from_base +
          read_delta_lflevel(cm, xd, r, mbmi, mi_col, mi_row) *
              cm->delta_lf_res;
      mbmi->current_delta_lf_from_base = xd->current_delta_lf_from_base =
          clamp(current_delta_lf_from_base, -MAX_LOOP_FILTER, MAX_LOOP_FILTER);
      xd->prev_delta_lf_from_base = xd->current_delta_lf_from_base;
#endif  // CONFIG_LOOPFILTER_LEVEL
    }
#endif
  }

  mbmi->current_q_index = xd->current_qindex;

  mbmi->ref_frame[0] = INTRA_FRAME;
  mbmi->ref_frame[1] = NONE_FRAME;

#if CONFIG_INTRABC
  if (cm->allow_screen_content_tools) {
    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);
  }
  if (av1_allow_intrabc(bsize, cm)) {
    read_intrabc_info(cm, xd, mi_row, mi_col, r);
    if (is_intrabc_block(mbmi)) return;
  }
#endif  // CONFIG_INTRABC

  mbmi->tx_size = read_tx_size(cm, xd, 0, 1, r);
#if CONFIG_INTRABC
  if (cm->allow_screen_content_tools)
    set_txfm_ctxs(mbmi->tx_size, xd->n8_w, xd->n8_h, mbmi->skip, xd);
#endif  // CONFIG_INTRABC

  mbmi->mode = read_intra_mode(r, get_y_mode_cdf(ec_ctx, above_mi, left_mi));

  if (is_chroma_reference(mi_row, mi_col, bsize, xd->plane[1].subsampling_x,
                          xd->plane[1].subsampling_y)) {
#if CONFIG_CFL
    xd->cfl.is_chroma_reference = 1;
#endif  // CONFIG_CFL
    mbmi->uv_mode = read_intra_mode_uv(ec_ctx, r, mbmi->mode);

#if CONFIG_CFL
    if (mbmi->uv_mode == UV_CFL_PRED) {
      if (!is_cfl_allowed(mbmi)) {
        aom_internal_error(
            &cm->error, AOM_CODEC_UNSUP_BITSTREAM,
            "Chroma from Luma (CfL) cannot be signaled for a %dx%d block.",
            block_size_wide[bsize], block_size_high[bsize]);
      }
      mbmi->cfl_alpha_idx = read_cfl_alphas(ec_ctx, r, &mbmi->cfl_alpha_signs);
      xd->cfl.store_y = 1;
    } else {
      xd->cfl.store_y = 0;
    }
#endif  // CONFIG_CFL

  } else {
    // Avoid decoding angle_info if there is is no chroma prediction
    mbmi->uv_mode = UV_DC_PRED;
#if CONFIG_CFL
    xd->cfl.is_chroma_reference = 0;
    xd->cfl.store_y = 1;
#endif
  }

#if CONFIG_EXT_INTRA
  read_intra_angle_info(xd, r);
#endif  // CONFIG_EXT_INTRA
  mbmi->palette_mode_info.palette_size[0] = 0;
  mbmi->palette_mode_info.palette_size[1] = 0;
  if (av1_allow_palette(cm->allow_screen_content_tools, bsize))
    read_palette_mode_info(cm, xd, r);
#if CONFIG_FILTER_INTRA
  mbmi->filter_intra_mode_info.use_filter_intra_mode[0] = 0;
  mbmi->filter_intra_mode_info.use_filter_intra_mode[1] = 0;
  read_filter_intra_mode_info(xd, r);
#endif  // CONFIG_FILTER_INTRA

#if !CONFIG_TXK_SEL
  av1_read_tx_type(cm, xd, r);
#endif  // !CONFIG_TXK_SEL
}

static int read_mv_component(aom_reader *r, nmv_component *mvcomp,
#if CONFIG_INTRABC || CONFIG_AMVR
                             int use_subpel,
#endif  // CONFIG_INTRABC || CONFIG_AMVR
                             int usehp) {
  int mag, d, fr, hp;
  const int sign = aom_read_symbol(r, mvcomp->sign_cdf, 2, ACCT_STR);
  const int mv_class =
      aom_read_symbol(r, mvcomp->classes_cdf, MV_CLASSES, ACCT_STR);
  const int class0 = mv_class == MV_CLASS_0;

  // Integer part
  if (class0) {
    d = aom_read_symbol(r, mvcomp->class0_cdf, CLASS0_SIZE, ACCT_STR);
    mag = 0;
  } else {
    const int n = mv_class + CLASS0_BITS - 1;  // number of bits
    d = 0;
    for (int i = 0; i < n; ++i)
      d |= aom_read_symbol(r, mvcomp->bits_cdf[i], 2, ACCT_STR) << i;
    mag = CLASS0_SIZE << (mv_class + 2);
  }

#if CONFIG_INTRABC || CONFIG_AMVR
  if (use_subpel) {
#endif  // CONFIG_INTRABC || CONFIG_AMVR
        // Fractional part
    fr = aom_read_symbol(r, class0 ? mvcomp->class0_fp_cdf[d] : mvcomp->fp_cdf,
                         MV_FP_SIZE, ACCT_STR);

    // High precision part (if hp is not used, the default value of the hp is 1)
    hp = usehp ? aom_read_symbol(
                     r, class0 ? mvcomp->class0_hp_cdf : mvcomp->hp_cdf, 2,
                     ACCT_STR)
               : 1;
#if CONFIG_INTRABC || CONFIG_AMVR
  } else {
    fr = 3;
    hp = 1;
  }
#endif  // CONFIG_INTRABC || CONFIG_AMVR

  // Result
  mag += ((d << 3) | (fr << 1) | hp) + 1;
  return sign ? -mag : mag;
}

static INLINE void read_mv(aom_reader *r, MV *mv, const MV *ref,
                           nmv_context *ctx, MvSubpelPrecision precision) {
  MV diff = { 0, 0 };
  const MV_JOINT_TYPE joint_type =
      (MV_JOINT_TYPE)aom_read_symbol(r, ctx->joints_cdf, MV_JOINTS, ACCT_STR);

  if (mv_joint_vertical(joint_type))
    diff.row = read_mv_component(r, &ctx->comps[0],
#if CONFIG_INTRABC || CONFIG_AMVR
                                 precision > MV_SUBPEL_NONE,
#endif  // CONFIG_INTRABC || CONFIG_AMVR
                                 precision > MV_SUBPEL_LOW_PRECISION);

  if (mv_joint_horizontal(joint_type))
    diff.col = read_mv_component(r, &ctx->comps[1],
#if CONFIG_INTRABC || CONFIG_AMVR
                                 precision > MV_SUBPEL_NONE,
#endif  // CONFIG_INTRABC || CONFIG_AMVR
                                 precision > MV_SUBPEL_LOW_PRECISION);

  mv->row = ref->row + diff.row;
  mv->col = ref->col + diff.col;
}

static REFERENCE_MODE read_block_reference_mode(AV1_COMMON *cm,
                                                const MACROBLOCKD *xd,
                                                aom_reader *r) {
  if (!is_comp_ref_allowed(xd->mi[0]->mbmi.sb_type)) return SINGLE_REFERENCE;
  if (cm->reference_mode == REFERENCE_MODE_SELECT) {
    const int ctx = av1_get_reference_mode_context(cm, xd);
    const REFERENCE_MODE mode = (REFERENCE_MODE)aom_read_symbol(
        r, xd->tile_ctx->comp_inter_cdf[ctx], 2, ACCT_STR);
    FRAME_COUNTS *counts = xd->counts;
    if (counts) ++counts->comp_inter[ctx][mode];
    return mode;  // SINGLE_REFERENCE or COMPOUND_REFERENCE
  } else {
#if CONFIG_REF_ADAPT
    assert(cm->reference_mode == SINGLE_REFERENCE);
#endif  // CONFIG_REF_ADAPT
    return cm->reference_mode;
  }
}

#define READ_REF_BIT(pname) \
  aom_read_symbol(r, av1_get_pred_cdf_##pname(cm, xd), 2, ACCT_STR)
#define READ_REF_BIT2(pname) \
  aom_read_symbol(r, av1_get_pred_cdf_##pname(xd), 2, ACCT_STR)

#if CONFIG_EXT_COMP_REFS
static COMP_REFERENCE_TYPE read_comp_reference_type(const MACROBLOCKD *xd,
                                                    aom_reader *r) {
  const int ctx = av1_get_comp_reference_type_context(xd);
  const COMP_REFERENCE_TYPE comp_ref_type =
      (COMP_REFERENCE_TYPE)aom_read_symbol(
          r, xd->tile_ctx->comp_ref_type_cdf[ctx], 2, ACCT_STR);
  FRAME_COUNTS *counts = xd->counts;
  if (counts) ++counts->comp_ref_type[ctx][comp_ref_type];
  return comp_ref_type;  // UNIDIR_COMP_REFERENCE or BIDIR_COMP_REFERENCE
}
#endif  // CONFIG_EXT_COMP_REFS

#if CONFIG_EXT_SKIP
static void set_ref_frames_for_skip_mode(AV1_COMMON *const cm,
                                         MV_REFERENCE_FRAME ref_frame[2]) {
  ref_frame[0] = LAST_FRAME + cm->ref_frame_idx_0;
  ref_frame[1] = LAST_FRAME + cm->ref_frame_idx_1;
}
#endif  // CONFIG_EXT_SKIP

// Read the referncence frame
static void read_ref_frames(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                            aom_reader *r, int segment_id,
                            MV_REFERENCE_FRAME ref_frame[2]) {
  FRAME_COUNTS *counts = xd->counts;

  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
    ref_frame[0] = (MV_REFERENCE_FRAME)get_segdata(&cm->seg, segment_id,
                                                   SEG_LVL_REF_FRAME);
    ref_frame[1] = NONE_FRAME;
  }
#if CONFIG_SEGMENT_GLOBALMV
  else if (segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP) ||
           segfeature_active(&cm->seg, segment_id, SEG_LVL_GLOBALMV))
#else
  else if (segfeature_active(&cm->seg, segment_id, SEG_LVL_SKIP))
#endif
  {
    ref_frame[0] = LAST_FRAME;
    ref_frame[1] = NONE_FRAME;
  } else {
#if CONFIG_EXT_SKIP
    if (xd->mi[0]->mbmi.skip_mode) {
      set_ref_frames_for_skip_mode(cm, ref_frame);
      return;
    }
#endif  // CONFIG_EXT_SKIP

    const REFERENCE_MODE mode = read_block_reference_mode(cm, xd, r);

    // FIXME(rbultje) I'm pretty sure this breaks segmentation ref frame coding
    if (mode == COMPOUND_REFERENCE) {
#if CONFIG_EXT_COMP_REFS
      const COMP_REFERENCE_TYPE comp_ref_type = read_comp_reference_type(xd, r);

      if (comp_ref_type == UNIDIR_COMP_REFERENCE) {
        const int ctx = av1_get_pred_context_uni_comp_ref_p(xd);
        const int bit = READ_REF_BIT2(uni_comp_ref_p);
        if (counts) ++counts->uni_comp_ref[ctx][0][bit];

        if (bit) {
          ref_frame[0] = BWDREF_FRAME;
          ref_frame[1] = ALTREF_FRAME;
        } else {
          const int ctx1 = av1_get_pred_context_uni_comp_ref_p1(xd);
          const int bit1 = READ_REF_BIT2(uni_comp_ref_p1);
          if (counts) ++counts->uni_comp_ref[ctx1][1][bit1];

          if (bit1) {
            const int ctx2 = av1_get_pred_context_uni_comp_ref_p2(xd);
            const int bit2 = READ_REF_BIT2(uni_comp_ref_p2);
            if (counts) ++counts->uni_comp_ref[ctx2][2][bit2];

            if (bit2) {
              ref_frame[0] = LAST_FRAME;
              ref_frame[1] = GOLDEN_FRAME;
            } else {
              ref_frame[0] = LAST_FRAME;
              ref_frame[1] = LAST3_FRAME;
            }
          } else {
            ref_frame[0] = LAST_FRAME;
            ref_frame[1] = LAST2_FRAME;
          }
        }

        return;
      }

      assert(comp_ref_type == BIDIR_COMP_REFERENCE);
#endif  // CONFIG_EXT_COMP_REFS

      const int idx = 1;

      const int ctx = av1_get_pred_context_comp_ref_p(cm, xd);
      const int bit = READ_REF_BIT(comp_ref_p);
      if (counts) ++counts->comp_ref[ctx][0][bit];

      // Decode forward references.
      if (!bit) {
        const int ctx1 = av1_get_pred_context_comp_ref_p1(cm, xd);
        const int bit1 = READ_REF_BIT(comp_ref_p1);
        if (counts) ++counts->comp_ref[ctx1][1][bit1];
        ref_frame[!idx] = cm->comp_fwd_ref[bit1 ? 1 : 0];
      } else {
        const int ctx2 = av1_get_pred_context_comp_ref_p2(cm, xd);
        const int bit2 = READ_REF_BIT(comp_ref_p2);
        if (counts) ++counts->comp_ref[ctx2][2][bit2];
        ref_frame[!idx] = cm->comp_fwd_ref[bit2 ? 3 : 2];
      }

      // Decode backward references.
      const int ctx_bwd = av1_get_pred_context_comp_bwdref_p(cm, xd);
      const int bit_bwd = READ_REF_BIT(comp_bwdref_p);
      if (counts) ++counts->comp_bwdref[ctx_bwd][0][bit_bwd];
      if (!bit_bwd) {
        const int ctx1_bwd = av1_get_pred_context_comp_bwdref_p1(cm, xd);
        const int bit1_bwd = READ_REF_BIT(comp_bwdref_p1);
        if (counts) ++counts->comp_bwdref[ctx1_bwd][1][bit1_bwd];
        ref_frame[idx] = cm->comp_bwd_ref[bit1_bwd];
      } else {
        ref_frame[idx] = cm->comp_bwd_ref[2];
      }
    } else if (mode == SINGLE_REFERENCE) {
      const int ctx0 = av1_get_pred_context_single_ref_p1(xd);
      const int bit0 = READ_REF_BIT(single_ref_p1);
      if (counts) ++counts->single_ref[ctx0][0][bit0];

      if (bit0) {
        const int ctx1 = av1_get_pred_context_single_ref_p2(xd);
        const int bit1 = READ_REF_BIT(single_ref_p2);
        if (counts) ++counts->single_ref[ctx1][1][bit1];
        if (!bit1) {
          const int ctx5 = av1_get_pred_context_single_ref_p6(xd);
          const int bit5 = READ_REF_BIT(single_ref_p6);
          if (counts) ++counts->single_ref[ctx5][5][bit5];
          ref_frame[0] = bit5 ? ALTREF2_FRAME : BWDREF_FRAME;
        } else {
          ref_frame[0] = ALTREF_FRAME;
        }
      } else {
        const int ctx2 = av1_get_pred_context_single_ref_p3(xd);
        const int bit2 = READ_REF_BIT(single_ref_p3);
        if (counts) ++counts->single_ref[ctx2][2][bit2];
        if (bit2) {
          const int ctx4 = av1_get_pred_context_single_ref_p5(xd);
          const int bit4 = READ_REF_BIT(single_ref_p5);
          if (counts) ++counts->single_ref[ctx4][4][bit4];
          ref_frame[0] = bit4 ? GOLDEN_FRAME : LAST3_FRAME;
        } else {
          const int ctx3 = av1_get_pred_context_single_ref_p4(xd);
          const int bit3 = READ_REF_BIT(single_ref_p4);
          if (counts) ++counts->single_ref[ctx3][3][bit3];
          ref_frame[0] = bit3 ? LAST2_FRAME : LAST_FRAME;
        }
      }

      ref_frame[1] = NONE_FRAME;
    } else {
      assert(0 && "Invalid prediction mode.");
    }
  }
}

static INLINE void read_mb_interp_filter(AV1_COMMON *const cm,
                                         MACROBLOCKD *const xd,
                                         MB_MODE_INFO *const mbmi,
                                         aom_reader *r) {
  FRAME_COUNTS *counts = xd->counts;
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;

  if (!av1_is_interp_needed(xd)) {
    set_default_interp_filters(mbmi, cm->interp_filter);
    return;
  }

  if (cm->interp_filter != SWITCHABLE) {
    mbmi->interp_filters = av1_broadcast_interp_filter(cm->interp_filter);
  } else {
#if CONFIG_DUAL_FILTER
    InterpFilter ref0_filter[2] = { EIGHTTAP_REGULAR, EIGHTTAP_REGULAR };
    for (int dir = 0; dir < 2; ++dir) {
      if (has_subpel_mv_component(xd->mi[0], xd, dir) ||
          (mbmi->ref_frame[1] > INTRA_FRAME &&
           has_subpel_mv_component(xd->mi[0], xd, dir + 2))) {
        const int ctx = av1_get_pred_context_switchable_interp(xd, dir);
        ref0_filter[dir] =
            (InterpFilter)aom_read_symbol(r, ec_ctx->switchable_interp_cdf[ctx],
                                          SWITCHABLE_FILTERS, ACCT_STR);
        if (counts) ++counts->switchable_interp[ctx][ref0_filter[dir]];
      }
    }
    // The index system works as: (0, 1) -> (vertical, horizontal) filter types
    mbmi->interp_filters =
        av1_make_interp_filters(ref0_filter[0], ref0_filter[1]);
#else   // CONFIG_DUAL_FILTER
    const int ctx = av1_get_pred_context_switchable_interp(xd);
    InterpFilter filter = (InterpFilter)aom_read_symbol(
        r, ec_ctx->switchable_interp_cdf[ctx], SWITCHABLE_FILTERS, ACCT_STR);
    mbmi->interp_filters = av1_broadcast_interp_filter(filter);
    if (counts) ++counts->switchable_interp[ctx][filter];
#endif  // CONFIG_DUAL_FILTER
  }
}

static void read_intra_block_mode_info(AV1_COMMON *const cm, const int mi_row,
                                       const int mi_col, MACROBLOCKD *const xd,
                                       MODE_INFO *mi, aom_reader *r) {
  MB_MODE_INFO *const mbmi = &mi->mbmi;
  const BLOCK_SIZE bsize = mi->mbmi.sb_type;

  mbmi->ref_frame[0] = INTRA_FRAME;
  mbmi->ref_frame[1] = NONE_FRAME;

  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;

  mbmi->mode = read_intra_mode(r, ec_ctx->y_mode_cdf[size_group_lookup[bsize]]);

  if (is_chroma_reference(mi_row, mi_col, bsize, xd->plane[1].subsampling_x,
                          xd->plane[1].subsampling_y)) {
    mbmi->uv_mode = read_intra_mode_uv(ec_ctx, r, mbmi->mode);

#if CONFIG_CFL
    if (mbmi->uv_mode == UV_CFL_PRED) {
      if (!is_cfl_allowed(mbmi)) {
        aom_internal_error(
            &cm->error, AOM_CODEC_UNSUP_BITSTREAM,
            "Chroma from Luma (CfL) cannot be signaled for a %dx%d block.",
            block_size_wide[bsize], block_size_high[bsize]);
      }
      mbmi->cfl_alpha_idx =
          read_cfl_alphas(xd->tile_ctx, r, &mbmi->cfl_alpha_signs);
      xd->cfl.store_y = 1;
    } else {
      xd->cfl.store_y = 0;
    }
#endif  // CONFIG_CFL

  } else {
    // Avoid decoding angle_info if there is is no chroma prediction
    mbmi->uv_mode = UV_DC_PRED;
#if CONFIG_CFL
    xd->cfl.is_chroma_reference = 0;
    xd->cfl.store_y = 1;
#endif
  }

  // Explicitly ignore cm here to avoid a compile warning if none of
  // ext-intra, palette and filter-intra are enabled.
  (void)cm;

#if CONFIG_EXT_INTRA
  read_intra_angle_info(xd, r);
#endif  // CONFIG_EXT_INTRA
  mbmi->palette_mode_info.palette_size[0] = 0;
  mbmi->palette_mode_info.palette_size[1] = 0;
  if (av1_allow_palette(cm->allow_screen_content_tools, bsize))
    read_palette_mode_info(cm, xd, r);
#if CONFIG_FILTER_INTRA
  mbmi->filter_intra_mode_info.use_filter_intra_mode[0] = 0;
  mbmi->filter_intra_mode_info.use_filter_intra_mode[1] = 0;
  read_filter_intra_mode_info(xd, r);
#endif  // CONFIG_FILTER_INTRA
}

static INLINE int is_mv_valid(const MV *mv) {
  return mv->row > MV_LOW && mv->row < MV_UPP && mv->col > MV_LOW &&
         mv->col < MV_UPP;
}

static INLINE int assign_mv(AV1_COMMON *cm, MACROBLOCKD *xd,
                            PREDICTION_MODE mode,
                            MV_REFERENCE_FRAME ref_frame[2], int_mv mv[2],
                            int_mv ref_mv[2], int_mv nearest_mv[2],
                            int_mv near_mv[2], int mi_row, int mi_col,
                            int is_compound, int allow_hp, aom_reader *r) {
  int ret = 1;
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  BLOCK_SIZE bsize = xd->mi[0]->mbmi.sb_type;
  MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
  int_mv *pred_mv = mbmi->pred_mv;
  (void)ref_frame;
  (void)cm;
  (void)mi_row;
  (void)mi_col;
  (void)bsize;
#if CONFIG_AMVR
  if (cm->cur_frame_force_integer_mv) {
    allow_hp = MV_SUBPEL_NONE;
  }
#endif
  switch (mode) {
    case NEWMV: {
      for (int i = 0; i < 1 + is_compound; ++i) {
        int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
        int nmv_ctx =
            av1_nmv_ctx(xd->ref_mv_count[rf_type], xd->ref_mv_stack[rf_type], i,
                        mbmi->ref_mv_idx);
        nmv_context *const nmvc = &ec_ctx->nmvc[nmv_ctx];
        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, nmvc, allow_hp);
        ret = ret && is_mv_valid(&mv[i].as_mv);

        pred_mv[i].as_int = ref_mv[i].as_int;
      }
      break;
    }
    case NEARESTMV: {
      mv[0].as_int = nearest_mv[0].as_int;
      if (is_compound) mv[1].as_int = nearest_mv[1].as_int;

      pred_mv[0].as_int = nearest_mv[0].as_int;
      if (is_compound) pred_mv[1].as_int = nearest_mv[1].as_int;
      break;
    }
    case NEARMV: {
      mv[0].as_int = near_mv[0].as_int;
      if (is_compound) mv[1].as_int = near_mv[1].as_int;

      pred_mv[0].as_int = near_mv[0].as_int;
      if (is_compound) pred_mv[1].as_int = near_mv[1].as_int;
      break;
    }
    case GLOBALMV: {
      mv[0].as_int = gm_get_motion_vector(&cm->global_motion[ref_frame[0]],
                                          cm->allow_high_precision_mv, bsize,
                                          mi_col, mi_row
#if CONFIG_AMVR
                                          ,
                                          cm->cur_frame_force_integer_mv
#endif
                                          )
                         .as_int;
      if (is_compound)
        mv[1].as_int = gm_get_motion_vector(&cm->global_motion[ref_frame[1]],
                                            cm->allow_high_precision_mv, bsize,
                                            mi_col, mi_row
#if CONFIG_AMVR
                                            ,
                                            cm->cur_frame_force_integer_mv
#endif
                                            )
                           .as_int;

      pred_mv[0].as_int = mv[0].as_int;
      if (is_compound) pred_mv[1].as_int = mv[1].as_int;
      break;
    }
    case NEW_NEWMV: {
      assert(is_compound);
      for (int i = 0; i < 2; ++i) {
        int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
        int nmv_ctx =
            av1_nmv_ctx(xd->ref_mv_count[rf_type], xd->ref_mv_stack[rf_type], i,
                        mbmi->ref_mv_idx);
        nmv_context *const nmvc = &ec_ctx->nmvc[nmv_ctx];
        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, nmvc, allow_hp);
        ret = ret && is_mv_valid(&mv[i].as_mv);
      }
      break;
    }
    case NEAREST_NEARESTMV: {
      assert(is_compound);
      mv[0].as_int = nearest_mv[0].as_int;
      mv[1].as_int = nearest_mv[1].as_int;
      break;
    }
    case NEAR_NEARMV: {
      assert(is_compound);
      mv[0].as_int = near_mv[0].as_int;
      mv[1].as_int = near_mv[1].as_int;
      break;
    }
    case NEW_NEARESTMV: {
      int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
      int nmv_ctx = av1_nmv_ctx(xd->ref_mv_count[rf_type],
                                xd->ref_mv_stack[rf_type], 0, mbmi->ref_mv_idx);
      nmv_context *const nmvc = &ec_ctx->nmvc[nmv_ctx];
      read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, nmvc, allow_hp);
      assert(is_compound);
      ret = ret && is_mv_valid(&mv[0].as_mv);
      mv[1].as_int = nearest_mv[1].as_int;
      break;
    }
    case NEAREST_NEWMV: {
      int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
      int nmv_ctx = av1_nmv_ctx(xd->ref_mv_count[rf_type],
                                xd->ref_mv_stack[rf_type], 1, mbmi->ref_mv_idx);
      nmv_context *const nmvc = &ec_ctx->nmvc[nmv_ctx];
      mv[0].as_int = nearest_mv[0].as_int;
      read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, nmvc, allow_hp);
      assert(is_compound);
      ret = ret && is_mv_valid(&mv[1].as_mv);
      break;
    }
    case NEAR_NEWMV: {
      int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
      int nmv_ctx = av1_nmv_ctx(xd->ref_mv_count[rf_type],
                                xd->ref_mv_stack[rf_type], 1, mbmi->ref_mv_idx);
      nmv_context *const nmvc = &ec_ctx->nmvc[nmv_ctx];
      mv[0].as_int = near_mv[0].as_int;
      read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, nmvc, allow_hp);
      assert(is_compound);

      ret = ret && is_mv_valid(&mv[1].as_mv);
      break;
    }
    case NEW_NEARMV: {
      int8_t rf_type = av1_ref_frame_type(mbmi->ref_frame);
      int nmv_ctx = av1_nmv_ctx(xd->ref_mv_count[rf_type],
                                xd->ref_mv_stack[rf_type], 0, mbmi->ref_mv_idx);
      nmv_context *const nmvc = &ec_ctx->nmvc[nmv_ctx];
      read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, nmvc, allow_hp);
      assert(is_compound);
      ret = ret && is_mv_valid(&mv[0].as_mv);
      mv[1].as_int = near_mv[1].as_int;
      break;
    }
    case GLOBAL_GLOBALMV: {
      assert(is_compound);
      mv[0].as_int = gm_get_motion_vector(&cm->global_motion[ref_frame[0]],
                                          cm->allow_high_precision_mv, bsize,
                                          mi_col, mi_row
#if CONFIG_AMVR
                                          ,
                                          cm->cur_frame_force_integer_mv
#endif
                                          )
                         .as_int;
      mv[1].as_int = gm_get_motion_vector(&cm->global_motion[ref_frame[1]],
                                          cm->allow_high_precision_mv, bsize,
                                          mi_col, mi_row
#if CONFIG_AMVR
                                          ,
                                          cm->cur_frame_force_integer_mv
#endif
                                          )
                         .as_int;
      break;
    }
    default: { return 0; }
  }
  return ret;
}

static int read_is_inter_block(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                               int segment_id, aom_reader *r) {
  if (segfeature_active(&cm->seg, segment_id, SEG_LVL_REF_FRAME)) {
    return get_segdata(&cm->seg, segment_id, SEG_LVL_REF_FRAME) != INTRA_FRAME;
  }
  const int ctx = av1_get_intra_inter_context(xd);
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
  const int is_inter =
      aom_read_symbol(r, ec_ctx->intra_inter_cdf[ctx], 2, ACCT_STR);
  FRAME_COUNTS *counts = xd->counts;
  if (counts) ++counts->intra_inter[ctx][is_inter];
  return is_inter;
}

static void fpm_sync(void *const data, int mi_row) {
  AV1Decoder *const pbi = (AV1Decoder *)data;
  av1_frameworker_wait(pbi->frame_worker_owner, pbi->common.prev_frame,
                       mi_row << pbi->common.mib_size_log2);
}

#if DEC_MISMATCH_DEBUG
static void dec_dump_logs(AV1_COMMON *cm, MODE_INFO *const mi, int mi_row,
                          int mi_col, int16_t mode_ctx) {
  int_mv mv[2] = { { 0 } };
  MB_MODE_INFO *const mbmi = &mi->mbmi;
  for (int ref = 0; ref < 1 + has_second_ref(mbmi); ++ref)
    mv[ref].as_mv = mbmi->mv[ref].as_mv;

  const int16_t newmv_ctx = mode_ctx & NEWMV_CTX_MASK;
  int16_t zeromv_ctx = -1;
  int16_t refmv_ctx = -1;
  if (mbmi->mode != NEWMV) {
    if (mode_ctx & (1 << ALL_ZERO_FLAG_OFFSET)) assert(mbmi->mode == GLOBALMV);
    zeromv_ctx = (mode_ctx >> GLOBALMV_OFFSET) & GLOBALMV_CTX_MASK;
    if (mbmi->mode != GLOBALMV) {
      refmv_ctx = (mode_ctx >> REFMV_OFFSET) & REFMV_CTX_MASK;
      if (mode_ctx & (1 << SKIP_NEARESTMV_OFFSET)) refmv_ctx = 6;
      if (mode_ctx & (1 << SKIP_NEARMV_OFFSET)) refmv_ctx = 7;
      if (mode_ctx & (1 << SKIP_NEARESTMV_SUB8X8_OFFSET)) refmv_ctx = 8;
    }
  }

#define FRAME_TO_CHECK 11
#if CONFIG_EXT_SKIP
  if (cm->current_video_frame == FRAME_TO_CHECK && cm->show_frame == 1) {
    printf(
        "=== DECODER ===: "
        "Frame=%d, (mi_row,mi_col)=(%d,%d), skip_mode=%d, mode=%d, bsize=%d, "
        "show_frame=%d, mv[0]=(%d,%d), mv[1]=(%d,%d), ref[0]=%d, "
        "ref[1]=%d, motion_mode=%d, mode_ctx=%d, "
        "newmv_ctx=%d, zeromv_ctx=%d, refmv_ctx=%d, tx_size=%d\n",
        cm->current_video_frame, mi_row, mi_col, mbmi->skip_mode, mbmi->mode,
        mbmi->sb_type, cm->show_frame, mv[0].as_mv.row, mv[0].as_mv.col,
        mv[1].as_mv.row, mv[1].as_mv.col, mbmi->ref_frame[0],
        mbmi->ref_frame[1], mbmi->motion_mode, mode_ctx, newmv_ctx, zeromv_ctx,
        refmv_ctx, mbmi->tx_size);
#else
  if (cm->current_video_frame == FRAME_TO_CHECK && cm->show_frame == 1) {
    printf(
        "=== DECODER ===: "
        "Frame=%d, (mi_row,mi_col)=(%d,%d), mode=%d, bsize=%d, "
        "show_frame=%d, mv[0]=(%d,%d), mv[1]=(%d,%d), ref[0]=%d, "
        "ref[1]=%d, motion_mode=%d, mode_ctx=%d, "
        "newmv_ctx=%d, zeromv_ctx=%d, refmv_ctx=%d, tx_size=%d\n",
        cm->current_video_frame, mi_row, mi_col, mbmi->mode, mbmi->sb_type,
        cm->show_frame, mv[0].as_mv.row, mv[0].as_mv.col, mv[1].as_mv.row,
        mv[1].as_mv.col, mbmi->ref_frame[0], mbmi->ref_frame[1],
        mbmi->motion_mode, mode_ctx, newmv_ctx, zeromv_ctx, refmv_ctx,
        mbmi->tx_size);
#endif  // CONFIG_EXT_SKIP
  }
}
#endif  // DEC_MISMATCH_DEBUG

static void read_inter_block_mode_info(AV1Decoder *const pbi,
                                       MACROBLOCKD *const xd,
                                       MODE_INFO *const mi, int mi_row,
                                       int mi_col, aom_reader *r) {
  AV1_COMMON *const cm = &pbi->common;
  MB_MODE_INFO *const mbmi = &mi->mbmi;
  const BLOCK_SIZE bsize = mbmi->sb_type;
  const int allow_hp = cm->allow_high_precision_mv;
  int_mv nearestmv[2], nearmv[2];
  int_mv ref_mvs[MODE_CTX_REF_FRAMES][MAX_MV_REF_CANDIDATES] = { { { 0 } } };
  int16_t inter_mode_ctx[MODE_CTX_REF_FRAMES];
  int16_t compound_inter_mode_ctx[MODE_CTX_REF_FRAMES];
  int pts[SAMPLES_ARRAY_SIZE], pts_inref[SAMPLES_ARRAY_SIZE];
#if CONFIG_EXT_WARPED_MOTION
  int pts_mv[SAMPLES_ARRAY_SIZE], pts_wm[SAMPLES_ARRAY_SIZE];
#endif  // CONFIG_EXT_WARPED_MOTION
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;

  assert(NELEMENTS(mode_2_counter) == MB_MODE_COUNT);

  mbmi->uv_mode = UV_DC_PRED;
  mbmi->palette_mode_info.palette_size[0] = 0;
  mbmi->palette_mode_info.palette_size[1] = 0;

  read_ref_frames(cm, xd, r, mbmi->segment_id, mbmi->ref_frame);
  const int is_compound = has_second_ref(mbmi);

  for (int ref = 0; ref < 1 + is_compound; ++ref) {
    MV_REFERENCE_FRAME frame = mbmi->ref_frame[ref];

    av1_find_mv_refs(cm, xd, mi, frame, &xd->ref_mv_count[frame],
                     xd->ref_mv_stack[frame], compound_inter_mode_ctx,
                     ref_mvs[frame], mi_row, mi_col, fpm_sync, (void *)pbi,
                     inter_mode_ctx);
  }

  if (is_compound) {
    MV_REFERENCE_FRAME ref_frame = av1_ref_frame_type(mbmi->ref_frame);
    av1_find_mv_refs(cm, xd, mi, ref_frame, &xd->ref_mv_count[ref_frame],
                     xd->ref_mv_stack[ref_frame], compound_inter_mode_ctx,
                     ref_mvs[ref_frame], mi_row, mi_col, fpm_sync, (void *)pbi,
                     inter_mode_ctx);

    if (xd->ref_mv_count[ref_frame] < 2) {
      MV_REFERENCE_FRAME rf[2];
      int_mv zeromv[2];
      av1_set_ref_frame(rf, ref_frame);
      zeromv[0].as_int = gm_get_motion_vector(&cm->global_motion[rf[0]],
                                              cm->allow_high_precision_mv,
                                              bsize, mi_col, mi_row
#if CONFIG_AMVR
                                              ,
                                              cm->cur_frame_force_integer_mv
#endif
                                              )
                             .as_int;
      zeromv[1].as_int =
          (rf[1] != NONE_FRAME)
              ? gm_get_motion_vector(&cm->global_motion[rf[1]],
                                     cm->allow_high_precision_mv, bsize, mi_col,
                                     mi_row
#if CONFIG_AMVR
                                     ,
                                     cm->cur_frame_force_integer_mv
#endif
                                     )
                    .as_int
              : 0;
      for (int ref = 0; ref < 2; ++ref) {
        if (rf[ref] == NONE_FRAME) continue;
#if CONFIG_AMVR
        lower_mv_precision(&ref_mvs[rf[ref]][0].as_mv, allow_hp,
                           cm->cur_frame_force_integer_mv);
        lower_mv_precision(&ref_mvs[rf[ref]][1].as_mv, allow_hp,
                           cm->cur_frame_force_integer_mv);
#else
        lower_mv_precision(&ref_mvs[rf[ref]][0].as_mv, allow_hp);
        lower_mv_precision(&ref_mvs[rf[ref]][1].as_mv, allow_hp);
#endif
        if (ref_mvs[rf[ref]][0].as_int != zeromv[ref].as_int ||
            ref_mvs[rf[ref]][1].as_int != zeromv[ref].as_int)
          inter_mode_ctx[ref_frame] &= ~(1 << ALL_ZERO_FLAG_OFFSET);
      }
    }
  }

  int mode_ctx = 0;

  if (is_compound)
    mode_ctx = compound_inter_mode_ctx[mbmi->ref_frame[0]];
  else
    mode_ctx =
        av1_mode_context_analyzer(inter_mode_ctx, mbmi->ref_frame, bsize, -1);
  mbmi->ref_mv_idx = 0;

#if CONFIG_SEGMENT_GLOBALMV
  if (segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP) ||
      segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_GLOBALMV))
#else
  if (segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP))
#endif
  {
    mbmi->mode = GLOBALMV;
#if CONFIG_EXT_SKIP
  } else if (mbmi->skip_mode) {
    assert(is_compound);
    mbmi->mode = NEAREST_NEARESTMV;
#endif  // CONFIG_EXT_SKIP
  } else {
    if (is_compound)
      mbmi->mode = read_inter_compound_mode(cm, xd, r, mode_ctx);
    else
      mbmi->mode = read_inter_mode(ec_ctx, xd, r, mode_ctx);
    if (mbmi->mode == NEWMV || mbmi->mode == NEW_NEWMV ||
        have_nearmv_in_inter_mode(mbmi->mode))
      read_drl_idx(ec_ctx, xd, mbmi, r);
  }

  if (is_compound != is_inter_compound_mode(mbmi->mode)) {
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Prediction mode %d invalid with ref frame %d %d",
                       mbmi->mode, mbmi->ref_frame[0], mbmi->ref_frame[1]);
  }

  if (mbmi->mode != GLOBALMV && mbmi->mode != GLOBAL_GLOBALMV) {
    for (int ref = 0; ref < 1 + is_compound; ++ref) {
#if CONFIG_AMVR
      av1_find_best_ref_mvs(allow_hp, ref_mvs[mbmi->ref_frame[ref]],
                            &nearestmv[ref], &nearmv[ref],
                            cm->cur_frame_force_integer_mv);
#else
      av1_find_best_ref_mvs(allow_hp, ref_mvs[mbmi->ref_frame[ref]],
                            &nearestmv[ref], &nearmv[ref]);
#endif
    }
  }

  if (is_compound && mbmi->mode != GLOBAL_GLOBALMV) {
    uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);

    if (xd->ref_mv_count[ref_frame_type] > 0) {
      if (mbmi->mode == NEAREST_NEARESTMV) {
        nearestmv[0] = xd->ref_mv_stack[ref_frame_type][0].this_mv;
        nearestmv[1] = xd->ref_mv_stack[ref_frame_type][0].comp_mv;
#if CONFIG_AMVR
        lower_mv_precision(&nearestmv[0].as_mv, allow_hp,
                           cm->cur_frame_force_integer_mv);
        lower_mv_precision(&nearestmv[1].as_mv, allow_hp,
                           cm->cur_frame_force_integer_mv);
#else
        lower_mv_precision(&nearestmv[0].as_mv, allow_hp);
        lower_mv_precision(&nearestmv[1].as_mv, allow_hp);
#endif
      } else if (mbmi->mode == NEAREST_NEWMV) {
        nearestmv[0] = xd->ref_mv_stack[ref_frame_type][0].this_mv;

#if CONFIG_AMVR
        lower_mv_precision(&nearestmv[0].as_mv, allow_hp,
                           cm->cur_frame_force_integer_mv);
#else
        lower_mv_precision(&nearestmv[0].as_mv, allow_hp);
#endif
      } else if (mbmi->mode == NEW_NEARESTMV) {
        nearestmv[1] = xd->ref_mv_stack[ref_frame_type][0].comp_mv;
#if CONFIG_AMVR
        lower_mv_precision(&nearestmv[1].as_mv, allow_hp,
                           cm->cur_frame_force_integer_mv);
#else
        lower_mv_precision(&nearestmv[1].as_mv, allow_hp);
#endif
      }
    }

    if (xd->ref_mv_count[ref_frame_type] > 1) {
      int ref_mv_idx = 1 + mbmi->ref_mv_idx;
      if (compound_ref0_mode(mbmi->mode) == NEARMV) {
        nearmv[0] = xd->ref_mv_stack[ref_frame_type][ref_mv_idx].this_mv;
#if CONFIG_AMVR
        lower_mv_precision(&nearmv[0].as_mv, allow_hp,
                           cm->cur_frame_force_integer_mv);
#else
        lower_mv_precision(&nearmv[0].as_mv, allow_hp);
#endif
      }

      if (compound_ref1_mode(mbmi->mode) == NEARMV) {
        nearmv[1] = xd->ref_mv_stack[ref_frame_type][ref_mv_idx].comp_mv;
#if CONFIG_AMVR
        lower_mv_precision(&nearmv[1].as_mv, allow_hp,
                           cm->cur_frame_force_integer_mv);
#else
        lower_mv_precision(&nearmv[1].as_mv, allow_hp);
#endif
      }
    }
  } else if (mbmi->ref_mv_idx > 0 && mbmi->mode == NEARMV) {
    int_mv cur_mv =
        xd->ref_mv_stack[mbmi->ref_frame[0]][1 + mbmi->ref_mv_idx].this_mv;
    nearmv[0] = cur_mv;
  }

  int_mv ref_mv[2];
  ref_mv[0] = nearestmv[0];
  ref_mv[1] = nearestmv[1];

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

    if (compound_ref0_mode(mbmi->mode) == NEWMV) {
      uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
      if (xd->ref_mv_count[ref_frame_type] > 1) {
        ref_mv[0] = xd->ref_mv_stack[ref_frame_type][ref_mv_idx].this_mv;
        clamp_mv_ref(&ref_mv[0].as_mv, xd->n8_w << MI_SIZE_LOG2,
                     xd->n8_h << MI_SIZE_LOG2, xd);
      }
      nearestmv[0] = ref_mv[0];
    }
    if (compound_ref1_mode(mbmi->mode) == NEWMV) {
      uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
      if (xd->ref_mv_count[ref_frame_type] > 1) {
        ref_mv[1] = xd->ref_mv_stack[ref_frame_type][ref_mv_idx].comp_mv;
        clamp_mv_ref(&ref_mv[1].as_mv, xd->n8_w << MI_SIZE_LOG2,
                     xd->n8_h << MI_SIZE_LOG2, xd);
      }
      nearestmv[1] = ref_mv[1];
    }
  } else {
    if (mbmi->mode == NEWMV) {
      uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
      if (xd->ref_mv_count[ref_frame_type] > 1) {
        ref_mv[0] = xd->ref_mv_stack[ref_frame_type][mbmi->ref_mv_idx].this_mv;
        clamp_mv_ref(&ref_mv[0].as_mv, xd->n8_w << MI_SIZE_LOG2,
                     xd->n8_h << MI_SIZE_LOG2, xd);
      }
      nearestmv[0] = ref_mv[0];
    }
  }

#if CONFIG_EXT_SKIP
  if (mbmi->skip_mode) {
#define USE_MV_SELECTION 0
#if USE_MV_SELECTION
    // NOTE: For skip mode, above reference selection has been set as compound,
    // in order to obtain the two nearest mvs, but after the following mv setup,
    // skip mode may choose either single reference or compound reference mode.
    av1_setup_skip_mode_mvs(cm, xd, mbmi, mi_row, mi_col, nearestmv, NULL,
                            NULL);
#else   // !USE_MV_SELECTION
    assert(mbmi->mode == NEAREST_NEARESTMV);
    mbmi->mv[0].as_int = nearestmv[0].as_int;
    mbmi->mv[1].as_int = nearestmv[1].as_int;
#endif  // USE_MV_SELECTION
#undef USE_MV_SELECTION
  } else {
#endif  // CONFIG_EXT_SKIP
    int mv_corrupted_flag =
        !assign_mv(cm, xd, mbmi->mode, mbmi->ref_frame, mbmi->mv, ref_mv,
                   nearestmv, nearmv, mi_row, mi_col, is_compound, allow_hp, r);
    aom_merge_corrupted_flag(&xd->corrupted, mv_corrupted_flag);
#if CONFIG_EXT_SKIP
  }
#endif  // CONFIG_EXT_SKIP

  mbmi->use_wedge_interintra = 0;
  if (cm->allow_interintra_compound &&
#if !CONFIG_REF_ADAPT
      cm->reference_mode != COMPOUND_REFERENCE &&
#endif  // !CONFIG_REF_ADAPT
#if CONFIG_EXT_SKIP
      !mbmi->skip_mode &&
#endif  // CONFIG_EXT_SKIP
      is_interintra_allowed(mbmi)) {
    const int bsize_group = size_group_lookup[bsize];
    const int interintra =
        aom_read_symbol(r, ec_ctx->interintra_cdf[bsize_group], 2, ACCT_STR);
    if (xd->counts) xd->counts->interintra[bsize_group][interintra]++;
    assert(mbmi->ref_frame[1] == NONE_FRAME);
    if (interintra) {
      const INTERINTRA_MODE interintra_mode =
          read_interintra_mode(xd, r, bsize_group);
      mbmi->ref_frame[1] = INTRA_FRAME;
      mbmi->interintra_mode = interintra_mode;
#if CONFIG_EXT_INTRA
      mbmi->angle_delta[0] = 0;
      mbmi->angle_delta[1] = 0;
#endif  // CONFIG_EXT_INTRA
#if CONFIG_FILTER_INTRA
      mbmi->filter_intra_mode_info.use_filter_intra_mode[0] = 0;
      mbmi->filter_intra_mode_info.use_filter_intra_mode[1] = 0;
#endif  // CONFIG_FILTER_INTRA
      if (is_interintra_wedge_used(bsize)) {
        mbmi->use_wedge_interintra = aom_read_symbol(
            r, ec_ctx->wedge_interintra_cdf[bsize], 2, ACCT_STR);
        if (xd->counts)
          xd->counts->wedge_interintra[bsize][mbmi->use_wedge_interintra]++;
        if (mbmi->use_wedge_interintra) {
          mbmi->interintra_wedge_index =
              aom_read_literal(r, get_wedge_bits_lookup(bsize), ACCT_STR);
          mbmi->interintra_wedge_sign = 0;
        }
      }
    }
  }

  for (int ref = 0; ref < 1 + has_second_ref(mbmi); ++ref) {
    const MV_REFERENCE_FRAME frame = mbmi->ref_frame[ref];
    RefBuffer *ref_buf = &cm->frame_refs[frame - LAST_FRAME];

    xd->block_refs[ref] = ref_buf;
  }

#if CONFIG_EXT_WARPED_MOTION
  int best_cand = -1;
#endif  // CONFIG_EXT_WARPED_MOTION
  mbmi->motion_mode = SIMPLE_TRANSLATION;
  if (mbmi->sb_type >= BLOCK_8X8 &&
#if CONFIG_EXT_SKIP
      !mbmi->skip_mode &&
#endif  // CONFIG_EXT_SKIP
      !has_second_ref(mbmi))
#if CONFIG_EXT_WARPED_MOTION
  {
    mbmi->num_proj_ref[0] =
        findSamples(cm, xd, mi_row, mi_col, pts, pts_inref, pts_mv, pts_wm);

    // Find a warped neighbor.
    int best_weight = 0;

    // if (mbmi->mode == NEARESTMV)
    for (int cand = 0; cand < mbmi->num_proj_ref[0]; cand++) {
      if (pts_wm[cand * 2 + 1] > best_weight) {
        best_weight = pts_wm[cand * 2 + 1];
        best_cand = cand;
      }
    }
  }
#else
    mbmi->num_proj_ref[0] = findSamples(cm, xd, mi_row, mi_col, pts, pts_inref);
#endif  // CONFIG_EXT_WARPED_MOTION
  av1_count_overlappable_neighbors(cm, xd, mi_row, mi_col);

  if (mbmi->ref_frame[1] != INTRA_FRAME)
#if CONFIG_EXT_WARPED_MOTION
    mbmi->motion_mode = read_motion_mode(xd, mi, r, best_cand);
#else
    mbmi->motion_mode = read_motion_mode(xd, mi, r);
#endif  // CONFIG_EXT_WARPED_MOTION

#if CONFIG_JNT_COMP
  // init
  mbmi->comp_group_idx = 0;
  mbmi->compound_idx = 1;
  mbmi->interinter_compound_type = COMPOUND_AVERAGE;

#if CONFIG_EXT_SKIP
#if CONFIG_JNT_COMP && SKIP_MODE_WITH_JNT_COMP
  if (mbmi->skip_mode) {
    const int cur_offset = (int)cm->frame_offset;
    const int cur_to_fwd = cur_offset - cm->ref_frame_idx_0;
    const int cur_to_bwd = abs(cm->ref_frame_idx_1 - cur_offset);
    if (cur_to_fwd != cur_to_bwd && xd->all_one_sided_refs) {
      const int comp_index_ctx = get_comp_index_context(cm, xd);
      mbmi->compound_idx = aom_read_symbol(
          r, ec_ctx->compound_index_cdf[comp_index_ctx], 2, ACCT_STR);

      if (xd->counts)
        ++xd->counts->compound_index[comp_index_ctx][mbmi->compound_idx];
    }
  }
#endif  // CONFIG_JNT_COMP && SKIP_MODE_WITH_JNT_COMP
#endif  // CONFIG_EXT_SKIP

  if (has_second_ref(mbmi)
#if CONFIG_EXT_SKIP
      && !mbmi->skip_mode
#endif  // CONFIG_EXT_SKIP
      ) {
    // Read idx to indicate current compound inter prediction mode group
    const int masked_compound_used =
        is_any_masked_compound_used(bsize) && cm->allow_masked_compound;

    if (masked_compound_used) {
      const int ctx_comp_group_idx = get_comp_group_idx_context(xd);
      mbmi->comp_group_idx = aom_read_symbol(
          r, ec_ctx->comp_group_idx_cdf[ctx_comp_group_idx], 2, ACCT_STR);
      if (xd->counts)
        ++xd->counts->comp_group_idx[ctx_comp_group_idx][mbmi->comp_group_idx];
    }

    if (mbmi->comp_group_idx == 0) {
      const int comp_index_ctx = get_comp_index_context(cm, xd);
      mbmi->compound_idx = aom_read_symbol(
          r, ec_ctx->compound_index_cdf[comp_index_ctx], 2, ACCT_STR);

      if (xd->counts)
        ++xd->counts->compound_index[comp_index_ctx][mbmi->compound_idx];
    } else {
      assert(cm->reference_mode != SINGLE_REFERENCE &&
             is_inter_compound_mode(mbmi->mode) &&
             mbmi->motion_mode == SIMPLE_TRANSLATION);
      assert(masked_compound_used);

      // compound_segment, wedge
      if (is_interinter_compound_used(COMPOUND_WEDGE, bsize))
        mbmi->interinter_compound_type =
            1 + aom_read_symbol(r, ec_ctx->compound_type_cdf[bsize],
                                COMPOUND_TYPES - 1, ACCT_STR);
      else
        mbmi->interinter_compound_type = COMPOUND_SEG;

      if (mbmi->interinter_compound_type == COMPOUND_WEDGE) {
        assert(is_interinter_compound_used(COMPOUND_WEDGE, bsize));
        mbmi->wedge_index =
            aom_read_literal(r, get_wedge_bits_lookup(bsize), ACCT_STR);
        mbmi->wedge_sign = aom_read_bit(r, ACCT_STR);
      } else {
        assert(mbmi->interinter_compound_type == COMPOUND_SEG);
        mbmi->mask_type = aom_read_literal(r, MAX_SEG_MASK_BITS, ACCT_STR);
      }

      if (xd->counts)
        xd->counts
            ->compound_interinter[bsize][mbmi->interinter_compound_type - 1]++;
    }
  }
#else  // CONFIG_JNT_COMP
  mbmi->interinter_compound_type = COMPOUND_AVERAGE;
  if (cm->reference_mode != SINGLE_REFERENCE &&
      is_inter_compound_mode(mbmi->mode) &&
      mbmi->motion_mode == SIMPLE_TRANSLATION
#if CONFIG_EXT_SKIP
      && !mbmi->skip_mode
#endif  // CONFIG_EXT_SKIP
      ) {
    if (is_any_masked_compound_used(bsize)) {
      if (cm->allow_masked_compound) {
        if (!is_interinter_compound_used(COMPOUND_WEDGE, bsize))
          mbmi->interinter_compound_type =
              aom_read_bit(r, ACCT_STR) ? COMPOUND_AVERAGE : COMPOUND_SEG;
        else
          mbmi->interinter_compound_type = aom_read_symbol(
              r, ec_ctx->compound_type_cdf[bsize], COMPOUND_TYPES, ACCT_STR);
        if (mbmi->interinter_compound_type == COMPOUND_WEDGE) {
          assert(is_interinter_compound_used(COMPOUND_WEDGE, bsize));
          mbmi->wedge_index =
              aom_read_literal(r, get_wedge_bits_lookup(bsize), ACCT_STR);
          mbmi->wedge_sign = aom_read_bit(r, ACCT_STR);
        }
        if (mbmi->interinter_compound_type == COMPOUND_SEG) {
          mbmi->mask_type = aom_read_literal(r, MAX_SEG_MASK_BITS, ACCT_STR);
        }
      }
    } else {
      mbmi->interinter_compound_type = COMPOUND_AVERAGE;
    }
    if (xd->counts)
      xd->counts->compound_interinter[bsize][mbmi->interinter_compound_type]++;
  }
#endif  // CONFIG_JNT_COMP

  read_mb_interp_filter(cm, xd, mbmi, r);

  if (mbmi->motion_mode == WARPED_CAUSAL) {
    mbmi->wm_params[0].wmtype = DEFAULT_WMTYPE;

#if CONFIG_EXT_WARPED_MOTION
    if (mbmi->mode == NEARESTMV && best_cand != -1) {
      MODE_INFO *best_mi = xd->mi[pts_wm[2 * best_cand]];
      assert(best_mi->mbmi.motion_mode == WARPED_CAUSAL);
      mbmi->wm_params[0] = best_mi->mbmi.wm_params[0];
    } else {
      if (mbmi->num_proj_ref[0] > 1)
        mbmi->num_proj_ref[0] = sortSamples(pts_mv, &mbmi->mv[0].as_mv, pts,
                                            pts_inref, mbmi->num_proj_ref[0]);
#endif  // CONFIG_EXT_WARPED_MOTION

      if (find_projection(mbmi->num_proj_ref[0], pts, pts_inref, bsize,
                          mbmi->mv[0].as_mv.row, mbmi->mv[0].as_mv.col,
                          &mbmi->wm_params[0], mi_row, mi_col)) {
#if WARPED_MOTION_DEBUG
        printf("Warning: unexpected warped model from aomenc\n");
#endif
        mbmi->wm_params[0].invalid = 1;
      }
#if CONFIG_EXT_WARPED_MOTION
    }
#endif  // CONFIG_EXT_WARPED_MOTION
  }

#if DEC_MISMATCH_DEBUG
  dec_dump_logs(cm, mi, mi_row, mi_col, mode_ctx);
#endif  // DEC_MISMATCH_DEBUG
}

static void read_inter_frame_mode_info(AV1Decoder *const pbi,
                                       MACROBLOCKD *const xd, int mi_row,
                                       int mi_col, aom_reader *r) {
  AV1_COMMON *const cm = &pbi->common;
  MODE_INFO *const mi = xd->mi[0];
  MB_MODE_INFO *const mbmi = &mi->mbmi;
  int inter_block = 1;
  BLOCK_SIZE bsize = mbmi->sb_type;

  mbmi->mv[0].as_int = 0;
  mbmi->mv[1].as_int = 0;
  mbmi->segment_id = read_inter_segment_id(cm, xd, mi_row, mi_col, 1, r);

#if CONFIG_EXT_SKIP
  mbmi->skip_mode = read_skip_mode(cm, xd, mbmi->segment_id, r);
#if 0
  if (mbmi->skip_mode)
    printf("Frame=%d, frame_offset=%d, (mi_row,mi_col)=(%d,%d), skip_mode=%d\n",
           cm->current_video_frame, cm->frame_offset, mi_row, mi_col,
           mbmi->skip_mode);
#endif  // 0

  if (mbmi->skip_mode)
    mbmi->skip = 1;
  else
#endif  // CONFIG_EXT_SKIP
    mbmi->skip = read_skip(cm, xd, mbmi->segment_id, r);

#if CONFIG_SPATIAL_SEGMENTATION
  mbmi->segment_id = read_inter_segment_id(cm, xd, mi_row, mi_col, 0, r);
#endif

  read_cdef(cm, r, mbmi, mi_col, mi_row);

  if (cm->delta_q_present_flag) {
    xd->current_qindex =
        xd->prev_qindex +
        read_delta_qindex(cm, xd, r, mbmi, mi_col, mi_row) * cm->delta_q_res;
    /* Normative: Clamp to [1,MAXQ] to not interfere with lossless mode */
    xd->current_qindex = clamp(xd->current_qindex, 1, MAXQ);
    xd->prev_qindex = xd->current_qindex;
#if CONFIG_EXT_DELTA_Q
    if (cm->delta_lf_present_flag) {
#if CONFIG_LOOPFILTER_LEVEL
      if (cm->delta_lf_multi) {
        for (int lf_id = 0; lf_id < FRAME_LF_COUNT; ++lf_id) {
          const int tmp_lvl =
              xd->prev_delta_lf[lf_id] +
              read_delta_lflevel(cm, xd, r, lf_id, mbmi, mi_col, mi_row) *
                  cm->delta_lf_res;
          mbmi->curr_delta_lf[lf_id] = xd->curr_delta_lf[lf_id] =
              clamp(tmp_lvl, -MAX_LOOP_FILTER, MAX_LOOP_FILTER);
          xd->prev_delta_lf[lf_id] = xd->curr_delta_lf[lf_id];
        }
      } else {
        const int tmp_lvl =
            xd->prev_delta_lf_from_base +
            read_delta_lflevel(cm, xd, r, -1, mbmi, mi_col, mi_row) *
                cm->delta_lf_res;
        mbmi->current_delta_lf_from_base = xd->current_delta_lf_from_base =
            clamp(tmp_lvl, -MAX_LOOP_FILTER, MAX_LOOP_FILTER);
        xd->prev_delta_lf_from_base = xd->current_delta_lf_from_base;
      }
#else
      const int current_delta_lf_from_base =
          xd->prev_delta_lf_from_base +
          read_delta_lflevel(cm, xd, r, mbmi, mi_col, mi_row) *
              cm->delta_lf_res;
      mbmi->current_delta_lf_from_base = xd->current_delta_lf_from_base =
          clamp(current_delta_lf_from_base, -MAX_LOOP_FILTER, MAX_LOOP_FILTER);
      xd->prev_delta_lf_from_base = xd->current_delta_lf_from_base;
#endif  // CONFIG_LOOPFILTER_LEVEL
    }
#endif  // CONFIG_EXT_DELTA_Q
  }

#if CONFIG_EXT_SKIP
  if (!mbmi->skip_mode)
#endif  // CONFIG_EXT_SKIP
    inter_block = read_is_inter_block(cm, xd, mbmi->segment_id, r);

  mbmi->current_q_index = xd->current_qindex;

  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);

  if (cm->tx_mode == TX_MODE_SELECT && block_signals_txsize(bsize) &&
      !mbmi->skip && inter_block && !xd->lossless[mbmi->segment_id]) {
    const TX_SIZE max_tx_size = get_max_rect_tx_size(bsize, inter_block);
    const int bh = tx_size_high_unit[max_tx_size];
    const int bw = tx_size_wide_unit[max_tx_size];
    const int width = block_size_wide[bsize] >> tx_size_wide_log2[0];
    const int height = block_size_high[bsize] >> tx_size_wide_log2[0];

    mbmi->min_tx_size = TX_SIZES_ALL;
    for (int idy = 0; idy < height; idy += bh)
      for (int idx = 0; idx < width; idx += bw)
        read_tx_size_vartx(cm, xd, mbmi, xd->counts, max_tx_size, 0, idy, idx,
                           r);
  } else {
    mbmi->tx_size = read_tx_size(cm, xd, inter_block, !mbmi->skip, r);

    if (inter_block) {
      const int width = block_size_wide[bsize] >> tx_size_wide_log2[0];
      const int height = block_size_high[bsize] >> tx_size_high_log2[0];
      for (int idy = 0; idy < height; ++idy)
        for (int idx = 0; idx < width; ++idx)
          mbmi->inter_tx_size[idy >> 1][idx >> 1] = mbmi->tx_size;
    }
    mbmi->min_tx_size = get_min_tx_size(mbmi->tx_size);
    set_txfm_ctxs(mbmi->tx_size, xd->n8_w, xd->n8_h, mbmi->skip, xd);
  }

  if (inter_block)
    read_inter_block_mode_info(pbi, xd, mi, mi_row, mi_col, r);
  else
    read_intra_block_mode_info(cm, mi_row, mi_col, xd, mi, r);

#if !CONFIG_TXK_SEL
#if CONFIG_EXT_SKIP
  if (!mbmi->skip_mode)
#endif  // CONFIG_EXT_SKIP
    av1_read_tx_type(cm, xd, r);
#endif  // !CONFIG_TXK_SEL
}

static void av1_intra_copy_frame_mvs(AV1_COMMON *const cm, int mi_row,
                                     int mi_col, int x_mis, int y_mis) {
#if CONFIG_TMV || CONFIG_MFMV
  const int frame_mvs_stride = ROUND_POWER_OF_TWO(cm->mi_cols, 1);
  MV_REF *frame_mvs =
      cm->cur_frame->mvs + (mi_row >> 1) * frame_mvs_stride + (mi_col >> 1);
  x_mis = ROUND_POWER_OF_TWO(x_mis, 1);
  y_mis = ROUND_POWER_OF_TWO(y_mis, 1);
#else
  const int frame_mvs_stride = cm->mi_cols;
  MV_REF *frame_mvs = cm->cur_frame->mvs +
                      (mi_row & 0xfffe) * frame_mvs_stride + (mi_col & 0xfffe);
  x_mis = AOMMAX(x_mis, 2);
  y_mis = AOMMAX(y_mis, 2);
#endif  // CONFIG_TMV

  for (int h = 0; h < y_mis; h++) {
    MV_REF *mv = frame_mvs;
    for (int w = 0; w < x_mis; w++) {
      mv->ref_frame[0] = NONE_FRAME;
      mv->ref_frame[1] = NONE_FRAME;
      mv++;
    }
    frame_mvs += frame_mvs_stride;
  }
}

void av1_read_mode_info(AV1Decoder *const pbi, MACROBLOCKD *xd, int mi_row,
                        int mi_col, aom_reader *r, int x_mis, int y_mis) {
  AV1_COMMON *const cm = &pbi->common;
  MODE_INFO *const mi = xd->mi[0];
#if CONFIG_INTRABC
  mi->mbmi.use_intrabc = 0;
#endif  // CONFIG_INTRABC

  if (frame_is_intra_only(cm)) {
    read_intra_frame_mode_info(cm, xd, mi_row, mi_col, r);
    av1_intra_copy_frame_mvs(cm, mi_row, mi_col, x_mis, y_mis);
  } else {
    read_inter_frame_mode_info(pbi, xd, mi_row, mi_col, r);
    av1_copy_frame_mvs(cm, mi, mi_row, mi_col, x_mis, y_mis);
  }
}