/*
 * 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"
#if CONFIG_WARPED_MOTION
#include "av1/common/warped_motion.h"
#endif  // CONFIG_WARPED_MOTION

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

#include "aom_dsp/aom_dsp_common.h"

#define ACCT_STR __func__
#if CONFIG_EXT_INTRA || CONFIG_FILTER_INTRA || CONFIG_PALETTE
static INLINE int read_uniform(aom_reader *r, int n) {
  int l = get_unsigned_bits(n);
  int m = (1 << l) - n;
  int v = aom_read_literal(r, l - 1, ACCT_STR);

  assert(l != 0);

  if (v < m)
    return v;
  else
    return (v << 1) - m + aom_read_literal(r, 1, ACCT_STR);
}
#endif  // CONFIG_EXT_INTRA || CONFIG_FILTER_INTRA || CONFIG_PALETTE

#if CONFIG_EC_MULTISYMBOL
static PREDICTION_MODE read_intra_mode(aom_reader *r, aom_cdf_prob *cdf) {
  return (PREDICTION_MODE)
      av1_intra_mode_inv[aom_read_symbol(r, cdf, INTRA_MODES, ACCT_STR)];
}
#else
static PREDICTION_MODE read_intra_mode(aom_reader *r, const aom_prob *p) {
  return (PREDICTION_MODE)aom_read_tree(r, av1_intra_mode_tree, p, ACCT_STR);
}
#endif

#if CONFIG_DELTA_Q
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 & MAX_MIB_MASK;
  const int b_row = mi_row & MAX_MIB_MASK;
  const int read_delta_q_flag = (b_col == 0 && b_row == 0);
  int rem_bits, thr, bit = 1;

  if ((bsize != BLOCK_64X64 || mbmi->skip == 0) && read_delta_q_flag) {
    abs = 0;
    while (abs < DELTA_Q_SMALL && bit) {
      bit = aom_read(r, cm->fc->delta_q_prob[abs], ACCT_STR);
      if (counts) counts->delta_q[abs][bit]++;
      abs += bit;
    }
    if (abs == DELTA_Q_SMALL) {
      rem_bits = aom_read_literal(r, 3, ACCT_STR);
      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;
}
#endif

static PREDICTION_MODE read_intra_mode_y(AV1_COMMON *cm, MACROBLOCKD *xd,
                                         aom_reader *r, int size_group) {
#if CONFIG_EC_ADAPT
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
#elif CONFIG_EC_MULTISYMBOL
  FRAME_CONTEXT *ec_ctx = cm->fc;
#endif

  const PREDICTION_MODE y_mode =
#if CONFIG_EC_MULTISYMBOL
      read_intra_mode(r, ec_ctx->y_mode_cdf[size_group]);
#else
      read_intra_mode(r, cm->fc->y_mode_prob[size_group]);
#endif
  FRAME_COUNTS *counts = xd->counts;
#if CONFIG_EC_ADAPT
  (void)cm;
#endif
  if (counts) ++counts->y_mode[size_group][y_mode];
  return y_mode;
}

static PREDICTION_MODE read_intra_mode_uv(AV1_COMMON *cm, MACROBLOCKD *xd,
                                          aom_reader *r,
                                          PREDICTION_MODE y_mode) {
#if CONFIG_EC_ADAPT
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
#elif CONFIG_EC_MULTISYMBOL
  FRAME_CONTEXT *ec_ctx = cm->fc;
#endif

  const PREDICTION_MODE uv_mode =
#if CONFIG_EC_MULTISYMBOL
      read_intra_mode(r, ec_ctx->uv_mode_cdf[y_mode]);
#else
      read_intra_mode(r, cm->fc->uv_mode_prob[y_mode]);
#endif
  FRAME_COUNTS *counts = xd->counts;
#if CONFIG_EC_ADAPT
  (void)cm;
#endif
  if (counts) ++counts->uv_mode[y_mode][uv_mode];
  return uv_mode;
}

#if CONFIG_EXT_INTER
static INTERINTRA_MODE read_interintra_mode(AV1_COMMON *cm, MACROBLOCKD *xd,
                                            aom_reader *r, int size_group) {
  const INTERINTRA_MODE ii_mode = (INTERINTRA_MODE)aom_read_tree(
      r, av1_interintra_mode_tree, cm->fc->interintra_mode_prob[size_group],
      ACCT_STR);
  FRAME_COUNTS *counts = xd->counts;
  if (counts) ++counts->interintra_mode[size_group][ii_mode];
  return ii_mode;
}
#endif  // CONFIG_EXT_INTER

static PREDICTION_MODE read_inter_mode(FRAME_CONTEXT *ec_ctx, MACROBLOCKD *xd,
#if CONFIG_REF_MV && CONFIG_EXT_INTER
                                       MB_MODE_INFO *mbmi,
#endif
                                       aom_reader *r, int16_t ctx) {

#if CONFIG_REF_MV
  FRAME_COUNTS *counts = xd->counts;
  int16_t mode_ctx = ctx & NEWMV_CTX_MASK;
  aom_prob mode_prob = ec_ctx->newmv_prob[mode_ctx];

  if (aom_read(r, mode_prob, ACCT_STR) == 0) {
    if (counts) ++counts->newmv_mode[mode_ctx][0];

#if CONFIG_EXT_INTER
    if (has_second_ref(mbmi)) {
#endif  // CONFIG_EXT_INTER
      return NEWMV;
#if CONFIG_EXT_INTER
    } else {
      mode_prob = ec_ctx->new2mv_prob;
      if (aom_read(r, mode_prob, ACCT_STR) == 0) {
        if (counts) ++counts->new2mv_mode[0];
        return NEWMV;
      } else {
        if (counts) ++counts->new2mv_mode[1];
        return NEWFROMNEARMV;
      }
    }
#endif  // CONFIG_EXT_INTER
  }
  if (counts) ++counts->newmv_mode[mode_ctx][1];

  if (ctx & (1 << ALL_ZERO_FLAG_OFFSET)) return ZEROMV;

  mode_ctx = (ctx >> ZEROMV_OFFSET) & ZEROMV_CTX_MASK;

  mode_prob = ec_ctx->zeromv_prob[mode_ctx];
  if (aom_read(r, mode_prob, ACCT_STR) == 0) {
    if (counts) ++counts->zeromv_mode[mode_ctx][0];
    return ZEROMV;
  }
  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;

  mode_prob = ec_ctx->refmv_prob[mode_ctx];

  if (aom_read(r, mode_prob, ACCT_STR) == 0) {
    if (counts) ++counts->refmv_mode[mode_ctx][0];

    return NEARESTMV;
  } else {
    if (counts) ++counts->refmv_mode[mode_ctx][1];
    return NEARMV;
  }

  // Invalid prediction mode.
  assert(0);
#else
#if CONFIG_EC_MULTISYMBOL
  const int mode = av1_inter_mode_inv[aom_read_symbol(
      r, ec_ctx->inter_mode_cdf[ctx], INTER_MODES, ACCT_STR)];
#else
  const int mode = aom_read_tree(r, av1_inter_mode_tree,
                                 ec_ctx->inter_mode_probs[ctx], ACCT_STR);
#endif
  FRAME_COUNTS *counts = xd->counts;
  if (counts) ++counts->inter_mode[ctx][mode];

  return NEARESTMV + mode;
#endif
}

#if CONFIG_REF_MV
static void read_drl_idx(const AV1_COMMON *cm, 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) {
    int idx;
    for (idx = 0; idx < 2; ++idx) {
      if (xd->ref_mv_count[ref_frame_type] > idx + 1) {
        uint8_t drl_ctx = av1_drl_ctx(xd->ref_mv_stack[ref_frame_type], idx);
        aom_prob drl_prob = cm->fc->drl_prob[drl_ctx];
        if (!aom_read(r, drl_prob, ACCT_STR)) {
          mbmi->ref_mv_idx = idx;
          if (xd->counts) ++xd->counts->drl_mode[drl_ctx][0];
          return;
        }
        mbmi->ref_mv_idx = idx + 1;
        if (xd->counts) ++xd->counts->drl_mode[drl_ctx][1];
      }
    }
  }

  if (mbmi->mode == NEARMV) {
    int idx;
    // Offset the NEARESTMV mode.
    // TODO(jingning): Unify the two syntax decoding loops after the NEARESTMV
    // mode is factored in.
    for (idx = 1; idx < 3; ++idx) {
      if (xd->ref_mv_count[ref_frame_type] > idx + 1) {
        uint8_t drl_ctx = av1_drl_ctx(xd->ref_mv_stack[ref_frame_type], idx);
        aom_prob drl_prob = cm->fc->drl_prob[drl_ctx];
        if (!aom_read(r, drl_prob, ACCT_STR)) {
          mbmi->ref_mv_idx = idx - 1;
          if (xd->counts) ++xd->counts->drl_mode[drl_ctx][0];
          return;
        }
        mbmi->ref_mv_idx = idx;
        if (xd->counts) ++xd->counts->drl_mode[drl_ctx][1];
      }
    }
  }
}
#endif

#if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
static MOTION_MODE read_motion_mode(AV1_COMMON *cm, MACROBLOCKD *xd,
                                    MB_MODE_INFO *mbmi, aom_reader *r) {
  MOTION_MODE last_motion_mode_allowed = motion_mode_allowed(mbmi);
  int motion_mode;
  FRAME_COUNTS *counts = xd->counts;

  if (last_motion_mode_allowed == SIMPLE_TRANSLATION) return SIMPLE_TRANSLATION;
#if CONFIG_MOTION_VAR && CONFIG_WARPED_MOTION
  if (last_motion_mode_allowed == OBMC_CAUSAL) {
    motion_mode = aom_read(r, cm->fc->obmc_prob[mbmi->sb_type], ACCT_STR);
    if (counts) ++counts->obmc[mbmi->sb_type][motion_mode];
    return (MOTION_MODE)(SIMPLE_TRANSLATION + motion_mode);
  } else {
#endif  // CONFIG_MOTION_VAR && CONFIG_WARPED_MOTION
    motion_mode =
        aom_read_tree(r, av1_motion_mode_tree,
                      cm->fc->motion_mode_prob[mbmi->sb_type], ACCT_STR);
    if (counts) ++counts->motion_mode[mbmi->sb_type][motion_mode];
    return (MOTION_MODE)(SIMPLE_TRANSLATION + motion_mode);
#if CONFIG_MOTION_VAR && CONFIG_WARPED_MOTION
  }
#endif  // CONFIG_MOTION_VAR && CONFIG_WARPED_MOTION
}
#endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION

#if CONFIG_EXT_INTER
static PREDICTION_MODE read_inter_compound_mode(AV1_COMMON *cm, MACROBLOCKD *xd,
                                                aom_reader *r, int16_t ctx) {
  const int mode =
      aom_read_tree(r, av1_inter_compound_mode_tree,
                    cm->fc->inter_compound_mode_probs[ctx], 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;
}
#endif  // CONFIG_EXT_INTER

static int read_segment_id(aom_reader *r, struct segmentation_probs *segp) {
#if CONFIG_EC_MULTISYMBOL
  return aom_read_symbol(r, segp->tree_cdf, MAX_SEGMENTS, ACCT_STR);
#else
  return aom_read_tree(r, av1_segment_tree, segp->tree_probs, ACCT_STR);
#endif
}

#if CONFIG_VAR_TX
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) {
  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 + tx_col,
                                   xd->left_txfm_context + tx_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;

  if (depth == MAX_VARTX_DEPTH) {
    int idx, idy;
    inter_tx_size[0][0] = tx_size;
    for (idy = 0; idy < tx_size_high_unit[tx_size] / 2; ++idy)
      for (idx = 0; idx < 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 + tx_col,
                          xd->left_txfm_context + tx_row, tx_size, tx_size);
    return;
  }

  is_split = aom_read(r, cm->fc->txfm_partition_prob[ctx], ACCT_STR);

  if (is_split) {
    const TX_SIZE sub_txs = sub_tx_size_map[tx_size];
    const int bsl = tx_size_wide_unit[sub_txs];
    int i;

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

    if (tx_size == TX_8X8) {
      int idx, idy;
      inter_tx_size[0][0] = sub_txs;
      for (idy = 0; idy < tx_size_high_unit[tx_size] / 2; ++idy)
        for (idx = 0; idx < 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 + tx_col,
                            xd->left_txfm_context + tx_row, sub_txs, tx_size);
      return;
    }

    assert(bsl > 0);
    for (i = 0; i < 4; ++i) {
      int offsetr = blk_row + (i >> 1) * bsl;
      int offsetc = blk_col + (i & 0x01) * bsl;
      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 < tx_size_high_unit[tx_size] / 2; ++idy)
      for (idx = 0; idx < 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 + tx_col,
                          xd->left_txfm_context + tx_row, tx_size, tx_size);
  }
}
#endif

static TX_SIZE read_selected_tx_size(AV1_COMMON *cm, MACROBLOCKD *xd,
                                     int tx_size_cat, aom_reader *r) {
  FRAME_COUNTS *counts = xd->counts;
  const int ctx = get_tx_size_context(xd);
  const int depth =
      aom_read_tree(r, av1_tx_size_tree[tx_size_cat],
                    cm->fc->tx_size_probs[tx_size_cat][ctx], ACCT_STR);
  const TX_SIZE tx_size = depth_to_tx_size(depth);
#if CONFIG_RECT_TX
  assert(!is_rect_tx(tx_size));
#endif  // CONFIG_RECT_TX
  if (counts) ++counts->tx_size[tx_size_cat][ctx][depth];
  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 CONFIG_CB4X4 && (CONFIG_VAR_TX || CONFIG_RECT_TX)
#if CONFIG_RECT_TX
  if (bsize > BLOCK_4X4) {
#else
  if (bsize >= BLOCK_8X8 || (bsize > BLOCK_4X4 && is_inter)) {
#endif  // CONFIG_RECT_TX
#else
  if (bsize >= BLOCK_8X8) {
#endif  // CONFIG_CB4X4 && CONFIG_VAR_TX
    if ((!is_inter || allow_select_inter) && tx_mode == TX_MODE_SELECT) {
      const int32_t tx_size_cat = is_inter ? inter_tx_size_cat_lookup[bsize]
                                           : intra_tx_size_cat_lookup[bsize];
      const TX_SIZE coded_tx_size =
          read_selected_tx_size(cm, xd, tx_size_cat, r);
#if CONFIG_EXT_TX && CONFIG_RECT_TX
      if (coded_tx_size > max_txsize_lookup[bsize]) {
        assert(coded_tx_size == max_txsize_lookup[bsize] + 1);
        return max_txsize_rect_lookup[bsize];
      }
#else
      assert(coded_tx_size <= max_txsize_lookup[bsize]);
#endif  // CONFIG_EXT_TX && CONFIG_RECT_TX
      return coded_tx_size;
    } else {
      return tx_size_from_tx_mode(bsize, tx_mode, is_inter);
    }
  } else {
#if CONFIG_EXT_TX && CONFIG_RECT_TX
    assert(IMPLIES(tx_mode == ONLY_4X4, bsize == BLOCK_4X4));
    return max_txsize_rect_lookup[bsize];
#else
    return TX_4X4;
#endif  // CONFIG_EXT_TX && CONFIG_RECT_TX
  }
}

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 x, y, segment_id = INT_MAX;

  for (y = 0; y < y_mis; y++)
    for (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) {
  int x, y;

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

  for (y = 0; y < y_mis; y++)
    for (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,
                                 int mi_offset, int x_mis, int y_mis,
                                 aom_reader *r) {
  struct segmentation *const seg = &cm->seg;
  FRAME_COUNTS *counts = xd->counts;
  struct segmentation_probs *const segp = &cm->fc->seg;
  int segment_id;

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

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

  segment_id = read_segment_id(r, segp);
  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) {
  int x, y;

  for (y = 0; y < y_mis; y++)
    for (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, aom_reader *r) {
  struct segmentation *const seg = &cm->seg;
  FRAME_COUNTS *counts = xd->counts;
  struct segmentation_probs *const segp = &cm->fc->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 (seg->temporal_update) {
    const int ctx = av1_get_pred_context_seg_id(xd);
    const aom_prob pred_prob = segp->pred_probs[ctx];
    mbmi->seg_id_predicted = aom_read(r, pred_prob, ACCT_STR);
    if (counts) ++counts->seg.pred[ctx][mbmi->seg_id_predicted];
    if (mbmi->seg_id_predicted) {
      segment_id = predicted_segment_id;
    } else {
      segment_id = read_segment_id(r, segp);
      if (counts) ++counts->seg.tree_mispred[segment_id];
    }
  } else {
    segment_id = read_segment_id(r, segp);
    if (counts) ++counts->seg.tree_total[segment_id];
  }
  set_segment_id(cm, mi_offset, x_mis, y_mis, segment_id);
  return segment_id;
}

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);
    const int skip = aom_read(r, cm->fc->skip_probs[ctx], ACCT_STR);
    FRAME_COUNTS *counts = xd->counts;
    if (counts) ++counts->skip[ctx][skip];
    return skip;
  }
}

#if CONFIG_PALETTE
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;
  int i, n;
  PALETTE_MODE_INFO *const pmi = &mbmi->palette_mode_info;

  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);
    if (aom_read(r, av1_default_palette_y_mode_prob[bsize - BLOCK_8X8]
                                                   [palette_y_mode_ctx],
                 ACCT_STR)) {
      pmi->palette_size[0] =
          aom_read_tree(r, av1_palette_size_tree,
                        av1_default_palette_y_size_prob[bsize - BLOCK_8X8],
                        ACCT_STR) +
          2;
      n = pmi->palette_size[0];
      for (i = 0; i < n; ++i)
        pmi->palette_colors[i] = aom_read_literal(r, cm->bit_depth, ACCT_STR);

      xd->plane[0].color_index_map[0] = read_uniform(r, n);
      assert(xd->plane[0].color_index_map[0] < n);
    }
  }

  if (mbmi->uv_mode == DC_PRED) {
    const int palette_uv_mode_ctx = (pmi->palette_size[0] > 0);
    if (aom_read(r, av1_default_palette_uv_mode_prob[palette_uv_mode_ctx],
                 ACCT_STR)) {
      pmi->palette_size[1] =
          aom_read_tree(r, av1_palette_size_tree,
                        av1_default_palette_uv_size_prob[bsize - BLOCK_8X8],
                        ACCT_STR) +
          2;
      n = pmi->palette_size[1];
      for (i = 0; i < n; ++i) {
        pmi->palette_colors[PALETTE_MAX_SIZE + i] =
            aom_read_literal(r, cm->bit_depth, ACCT_STR);
        pmi->palette_colors[2 * PALETTE_MAX_SIZE + i] =
            aom_read_literal(r, cm->bit_depth, ACCT_STR);
      }
      xd->plane[1].color_index_map[0] = read_uniform(r, n);
      assert(xd->plane[1].color_index_map[0] < n);
    }
  }
}
#endif  // CONFIG_PALETTE

#if CONFIG_FILTER_INTRA
static void read_filter_intra_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;
  FRAME_COUNTS *counts = xd->counts;
  FILTER_INTRA_MODE_INFO *filter_intra_mode_info =
      &mbmi->filter_intra_mode_info;

  if (mbmi->mode == DC_PRED
#if CONFIG_PALETTE
      && mbmi->palette_mode_info.palette_size[0] == 0
#endif  // CONFIG_PALETTE
      ) {
    filter_intra_mode_info->use_filter_intra_mode[0] =
        aom_read(r, cm->fc->filter_intra_probs[0], ACCT_STR);
    if (filter_intra_mode_info->use_filter_intra_mode[0]) {
      filter_intra_mode_info->filter_intra_mode[0] =
          read_uniform(r, FILTER_INTRA_MODES);
    }
    if (counts) {
      ++counts
            ->filter_intra[0][filter_intra_mode_info->use_filter_intra_mode[0]];
    }
  }
  if (mbmi->uv_mode == DC_PRED
#if CONFIG_PALETTE
      && mbmi->palette_mode_info.palette_size[1] == 0
#endif  // CONFIG_PALETTE
      ) {
    filter_intra_mode_info->use_filter_intra_mode[1] =
        aom_read(r, cm->fc->filter_intra_probs[1], ACCT_STR);
    if (filter_intra_mode_info->use_filter_intra_mode[1]) {
      filter_intra_mode_info->filter_intra_mode[1] =
          read_uniform(r, FILTER_INTRA_MODES);
    }
    if (counts) {
      ++counts
            ->filter_intra[1][filter_intra_mode_info->use_filter_intra_mode[1]];
    }
  }
}
#endif  // CONFIG_FILTER_INTRA

#if CONFIG_EXT_INTRA
static void read_intra_angle_info(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                  aom_reader *r) {
  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  const BLOCK_SIZE bsize = mbmi->sb_type;
#if CONFIG_INTRA_INTERP
  const int ctx = av1_get_pred_context_intra_interp(xd);
  int p_angle;
#endif  // CONFIG_INTRA_INTERP

  (void)cm;
  if (bsize < BLOCK_8X8) return;

  if (av1_is_directional_mode(mbmi->mode, bsize)) {
    const int max_angle_delta = av1_get_max_angle_delta(mbmi->sb_type, 0);
    mbmi->angle_delta[0] =
        read_uniform(r, 2 * max_angle_delta + 1) - max_angle_delta;
#if CONFIG_INTRA_INTERP
    p_angle = mode_to_angle_map[mbmi->mode] +
              mbmi->angle_delta[0] * av1_get_angle_step(mbmi->sb_type, 0);
    if (av1_is_intra_filter_switchable(p_angle)) {
      FRAME_COUNTS *counts = xd->counts;
      mbmi->intra_filter = aom_read_tree(
          r, av1_intra_filter_tree, cm->fc->intra_filter_probs[ctx], ACCT_STR);
      if (counts) ++counts->intra_filter[ctx][mbmi->intra_filter];
    } else {
      mbmi->intra_filter = INTRA_FILTER_LINEAR;
    }
#endif  // CONFIG_INTRA_INTERP
  }

  if (av1_is_directional_mode(mbmi->uv_mode, bsize)) {
    mbmi->angle_delta[1] =
        read_uniform(r, 2 * MAX_ANGLE_DELTA_UV + 1) - MAX_ANGLE_DELTA_UV;
  }
}
#endif  // CONFIG_EXT_INTRA

static void read_tx_type(const AV1_COMMON *const cm, MACROBLOCKD *xd,
                         MB_MODE_INFO *mbmi,
#if CONFIG_SUPERTX
                         int supertx_enabled,
#endif
                         aom_reader *r) {
  const int inter_block = is_inter_block(mbmi);
#if CONFIG_VAR_TX
  const TX_SIZE tx_size = inter_block ? mbmi->min_tx_size : mbmi->tx_size;
#else
  const TX_SIZE tx_size = mbmi->tx_size;
#endif
#if CONFIG_EC_ADAPT
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
#else
  FRAME_CONTEXT *ec_ctx = cm->fc;
#endif

  if (!FIXED_TX_TYPE) {
#if CONFIG_EXT_TX
    const TX_SIZE square_tx_size = txsize_sqr_map[tx_size];
    if (get_ext_tx_types(tx_size, mbmi->sb_type, inter_block) > 1 &&
        ((!cm->seg.enabled && cm->base_qindex > 0) ||
         (cm->seg.enabled && xd->qindex[mbmi->segment_id] > 0)) &&
        !mbmi->skip &&
#if CONFIG_SUPERTX
        !supertx_enabled &&
#endif  // CONFIG_SUPERTX
        !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
      int eset = get_ext_tx_set(tx_size, mbmi->sb_type, inter_block);
      FRAME_COUNTS *counts = xd->counts;

      if (inter_block) {
        if (eset > 0) {
          mbmi->tx_type = aom_read_tree(
              r, av1_ext_tx_inter_tree[eset],
              ec_ctx->inter_ext_tx_prob[eset][square_tx_size], ACCT_STR);
          if (counts)
            ++counts->inter_ext_tx[eset][square_tx_size][mbmi->tx_type];
        }
      } else if (ALLOW_INTRA_EXT_TX) {
        if (eset > 0) {
          mbmi->tx_type = aom_read_tree(
              r, av1_ext_tx_intra_tree[eset],
              ec_ctx->intra_ext_tx_prob[eset][square_tx_size][mbmi->mode],
              ACCT_STR);
          if (counts)
            ++counts->intra_ext_tx[eset][square_tx_size][mbmi->mode]
                                  [mbmi->tx_type];
        }
      }
    } else {
      mbmi->tx_type = DCT_DCT;
    }
#else

    if (tx_size < TX_32X32 &&
        ((!cm->seg.enabled && cm->base_qindex > 0) ||
         (cm->seg.enabled && xd->qindex[mbmi->segment_id] > 0)) &&
        !mbmi->skip &&
#if CONFIG_SUPERTX
        !supertx_enabled &&
#endif  // CONFIG_SUPERTX
        !segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
      FRAME_COUNTS *counts = xd->counts;

      if (inter_block) {
#if CONFIG_EC_MULTISYMBOL
        mbmi->tx_type = av1_ext_tx_inv[aom_read_symbol(
            r, ec_ctx->inter_ext_tx_cdf[tx_size], TX_TYPES, ACCT_STR)];
#else
        mbmi->tx_type = aom_read_tree(
            r, av1_ext_tx_tree, ec_ctx->inter_ext_tx_prob[tx_size], ACCT_STR);
#endif
        if (counts) ++counts->inter_ext_tx[tx_size][mbmi->tx_type];
      } else {
        const TX_TYPE tx_type_nom = intra_mode_to_tx_type_context[mbmi->mode];
#if CONFIG_EC_MULTISYMBOL
        mbmi->tx_type = av1_ext_tx_inv[aom_read_symbol(
            r, ec_ctx->intra_ext_tx_cdf[tx_size][tx_type_nom], TX_TYPES,
            ACCT_STR)];
#else
        mbmi->tx_type = aom_read_tree(
            r, av1_ext_tx_tree, ec_ctx->intra_ext_tx_prob[tx_size][tx_type_nom],
            ACCT_STR);
#endif
        if (counts) ++counts->intra_ext_tx[tx_size][tx_type_nom][mbmi->tx_type];
      }
    } else {
      mbmi->tx_type = DCT_DCT;
    }
#endif  // CONFIG_EXT_TX
  }
}

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;
  int i;
  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];

  // 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 CONFIG_EC_ADAPT
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
#elif CONFIG_EC_MULTISYMBOL
  FRAME_CONTEXT *ec_ctx = cm->fc;
#endif

  mbmi->segment_id = read_intra_segment_id(cm, xd, mi_offset, x_mis, y_mis, r);
  mbmi->skip = read_skip(cm, xd, mbmi->segment_id, r);

#if CONFIG_DELTA_Q
  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;
    xd->prev_qindex = xd->current_qindex;
  }
#endif

  mbmi->tx_size = read_tx_size(cm, xd, 0, 1, r);
  mbmi->ref_frame[0] = INTRA_FRAME;
  mbmi->ref_frame[1] = NONE_FRAME;

#if CONFIG_CB4X4
  (void)i;
  mbmi->mode =
#if CONFIG_EC_MULTISYMBOL
      read_intra_mode(r, get_y_mode_cdf(ec_ctx, mi, above_mi, left_mi, 0));
#else
      read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 0));
#endif
#else
  switch (bsize) {
    case BLOCK_4X4:
      for (i = 0; i < 4; ++i)
        mi->bmi[i].as_mode =
#if CONFIG_EC_MULTISYMBOL
            read_intra_mode(r,
                            get_y_mode_cdf(ec_ctx, mi, above_mi, left_mi, i));
#else
            read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, i));
#endif
      mbmi->mode = mi->bmi[3].as_mode;
      break;
    case BLOCK_4X8:
      mi->bmi[0].as_mode = mi->bmi[2].as_mode =
#if CONFIG_EC_MULTISYMBOL
          read_intra_mode(r, get_y_mode_cdf(ec_ctx, mi, above_mi, left_mi, 0));
#else
          read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 0));
#endif
      mi->bmi[1].as_mode = mi->bmi[3].as_mode = mbmi->mode =
#if CONFIG_EC_MULTISYMBOL
          read_intra_mode(r, get_y_mode_cdf(ec_ctx, mi, above_mi, left_mi, 1));
#else
          read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 1));
#endif
      break;
    case BLOCK_8X4:
      mi->bmi[0].as_mode = mi->bmi[1].as_mode =
#if CONFIG_EC_MULTISYMBOL
          read_intra_mode(r, get_y_mode_cdf(ec_ctx, mi, above_mi, left_mi, 0));
#else
          read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 0));
#endif
      mi->bmi[2].as_mode = mi->bmi[3].as_mode = mbmi->mode =
#if CONFIG_EC_MULTISYMBOL
          read_intra_mode(r, get_y_mode_cdf(ec_ctx, mi, above_mi, left_mi, 2));
#else
          read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 2));
#endif
      break;
    default:
      mbmi->mode =
#if CONFIG_EC_MULTISYMBOL
          read_intra_mode(r, get_y_mode_cdf(ec_ctx, mi, above_mi, left_mi, 0));
#else
          read_intra_mode(r, get_y_mode_probs(cm, mi, above_mi, left_mi, 0));
#endif
  }
#endif

  mbmi->uv_mode = read_intra_mode_uv(cm, xd, r, mbmi->mode);
#if CONFIG_EXT_INTRA
  read_intra_angle_info(cm, xd, r);
#endif  // CONFIG_EXT_INTRA
#if CONFIG_PALETTE
  mbmi->palette_mode_info.palette_size[0] = 0;
  mbmi->palette_mode_info.palette_size[1] = 0;
  if (bsize >= BLOCK_8X8 && cm->allow_screen_content_tools)
    read_palette_mode_info(cm, xd, r);
#endif  // CONFIG_PALETTE
#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;
  if (bsize >= BLOCK_8X8 || CONFIG_CB4X4)
    read_filter_intra_mode_info(cm, xd, r);
#endif  // CONFIG_FILTER_INTRA

  read_tx_type(cm, xd, mbmi,
#if CONFIG_SUPERTX
               0,
#endif
               r);
}

static int read_mv_component(aom_reader *r, nmv_component *mvcomp, int usehp) {
  int mag, d, fr, hp;
  const int sign = aom_read(r, mvcomp->sign, ACCT_STR);
  const int mv_class =
#if CONFIG_EC_MULTISYMBOL
      aom_read_symbol(r, mvcomp->class_cdf, MV_CLASSES, ACCT_STR);
#else
      aom_read_tree(r, av1_mv_class_tree, mvcomp->classes, ACCT_STR);
#endif
  const int class0 = mv_class == MV_CLASS_0;

  // Integer part
  if (class0) {
    d = aom_read(r, mvcomp->class0[0], ACCT_STR);
    mag = 0;
  } else {
    int i;
    const int n = mv_class + CLASS0_BITS - 1;  // number of bits

    d = 0;
    for (i = 0; i < n; ++i) d |= aom_read(r, mvcomp->bits[i], ACCT_STR) << i;
    mag = CLASS0_SIZE << (mv_class + 2);
  }

// Fractional part
#if CONFIG_EC_MULTISYMBOL
  fr = aom_read_symbol(r, class0 ? mvcomp->class0_fp_cdf[d] : mvcomp->fp_cdf,
                       MV_FP_SIZE, ACCT_STR);
#else
  fr = aom_read_tree(r, av1_mv_fp_tree,
                     class0 ? mvcomp->class0_fp[d] : mvcomp->fp, ACCT_STR);
#endif

  // High precision part (if hp is not used, the default value of the hp is 1)
  hp = usehp ? aom_read(r, class0 ? mvcomp->class0_hp : mvcomp->hp, ACCT_STR)
             : 1;

  // 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, nmv_context_counts *counts,
                           int allow_hp) {
  MV_JOINT_TYPE joint_type;
  MV diff = { 0, 0 };
  joint_type =
#if CONFIG_EC_MULTISYMBOL
      (MV_JOINT_TYPE)aom_read_symbol(r, ctx->joint_cdf, MV_JOINTS, ACCT_STR);
#else
      (MV_JOINT_TYPE)aom_read_tree(r, av1_mv_joint_tree, ctx->joints, ACCT_STR);
#endif

  if (mv_joint_vertical(joint_type))
    diff.row = read_mv_component(r, &ctx->comps[0], allow_hp);

  if (mv_joint_horizontal(joint_type))
    diff.col = read_mv_component(r, &ctx->comps[1], allow_hp);

  av1_inc_mv(&diff, counts, allow_hp);

  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 (cm->reference_mode == REFERENCE_MODE_SELECT) {
    const int ctx = av1_get_reference_mode_context(cm, xd);
    const REFERENCE_MODE mode =
        (REFERENCE_MODE)aom_read(r, cm->fc->comp_inter_prob[ctx], ACCT_STR);
    FRAME_COUNTS *counts = xd->counts;
    if (counts) ++counts->comp_inter[ctx][mode];
    return mode;  // SINGLE_REFERENCE or COMPOUND_REFERENCE
  } else {
    return cm->reference_mode;
  }
}

// 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_CONTEXT *const fc = cm->fc;
  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;
  } else {
    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_REFS
      const int idx = cm->ref_frame_sign_bias[cm->comp_bwd_ref[0]];
#else
      const int idx = cm->ref_frame_sign_bias[cm->comp_fixed_ref];
#endif  // CONFIG_EXT_REFS
      const int ctx = av1_get_pred_context_comp_ref_p(cm, xd);
      const int bit = aom_read(r, fc->comp_ref_prob[ctx][0], ACCT_STR);

      if (counts) ++counts->comp_ref[ctx][0][bit];

#if CONFIG_EXT_REFS
      // Decode forward references.
      if (!bit) {
        const int ctx1 = av1_get_pred_context_comp_ref_p1(cm, xd);
        const int bit1 = aom_read(r, fc->comp_ref_prob[ctx1][1], ACCT_STR);
        if (counts) ++counts->comp_ref[ctx1][1][bit1];
        ref_frame[!idx] = cm->comp_fwd_ref[bit1 ? 0 : 1];
      } else {
        const int ctx2 = av1_get_pred_context_comp_ref_p2(cm, xd);
        const int bit2 = aom_read(r, fc->comp_ref_prob[ctx2][2], ACCT_STR);
        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 =
            aom_read(r, fc->comp_bwdref_prob[ctx_bwd][0], ACCT_STR);
        if (counts) ++counts->comp_bwdref[ctx_bwd][0][bit_bwd];
        ref_frame[idx] = cm->comp_bwd_ref[bit_bwd];
      }
#else
      ref_frame[!idx] = cm->comp_var_ref[bit];
      ref_frame[idx] = cm->comp_fixed_ref;
#endif  // CONFIG_EXT_REFS
    } else if (mode == SINGLE_REFERENCE) {
#if CONFIG_EXT_REFS
      const int ctx0 = av1_get_pred_context_single_ref_p1(xd);
      const int bit0 = aom_read(r, fc->single_ref_prob[ctx0][0], ACCT_STR);
      if (counts) ++counts->single_ref[ctx0][0][bit0];

      if (bit0) {
        const int ctx1 = av1_get_pred_context_single_ref_p2(xd);
        const int bit1 = aom_read(r, fc->single_ref_prob[ctx1][1], ACCT_STR);
        if (counts) ++counts->single_ref[ctx1][1][bit1];
        ref_frame[0] = bit1 ? ALTREF_FRAME : BWDREF_FRAME;
      } else {
        const int ctx2 = av1_get_pred_context_single_ref_p3(xd);
        const int bit2 = aom_read(r, fc->single_ref_prob[ctx2][2], ACCT_STR);
        if (counts) ++counts->single_ref[ctx2][2][bit2];
        if (bit2) {
          const int ctx4 = av1_get_pred_context_single_ref_p5(xd);
          const int bit4 = aom_read(r, fc->single_ref_prob[ctx4][4], ACCT_STR);
          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 = aom_read(r, fc->single_ref_prob[ctx3][3], ACCT_STR);
          if (counts) ++counts->single_ref[ctx3][3][bit3];
          ref_frame[0] = bit3 ? LAST2_FRAME : LAST_FRAME;
        }
      }
#else
      const int ctx0 = av1_get_pred_context_single_ref_p1(xd);
      const int bit0 = aom_read(r, fc->single_ref_prob[ctx0][0], ACCT_STR);
      if (counts) ++counts->single_ref[ctx0][0][bit0];

      if (bit0) {
        const int ctx1 = av1_get_pred_context_single_ref_p2(xd);
        const int bit1 = aom_read(r, fc->single_ref_prob[ctx1][1], ACCT_STR);
        if (counts) ++counts->single_ref[ctx1][1][bit1];
        ref_frame[0] = bit1 ? ALTREF_FRAME : GOLDEN_FRAME;
      } else {
        ref_frame[0] = LAST_FRAME;
      }
#endif  // CONFIG_EXT_REFS

      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;
#if CONFIG_EC_ADAPT
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
#else
  FRAME_CONTEXT *ec_ctx = cm->fc;
#endif

#if CONFIG_GLOBAL_MOTION
  if (is_nontrans_global_motion(xd)) {
#if CONFIG_DUAL_FILTER
    mbmi->interp_filter[0] =
        cm->interp_filter == SWITCHABLE ? EIGHTTAP_REGULAR : cm->interp_filter;
    mbmi->interp_filter[1] =
        cm->interp_filter == SWITCHABLE ? EIGHTTAP_REGULAR : cm->interp_filter;
#else
    mbmi->interp_filter =
        cm->interp_filter == SWITCHABLE ? EIGHTTAP_REGULAR : cm->interp_filter;
#endif  // CONFIG_DUAL_FILTER
    return;
  }
#endif  // CONFIG_GLOBAL_MOTION

#if CONFIG_DUAL_FILTER
  if (cm->interp_filter != SWITCHABLE) {
    int dir;

    for (dir = 0; dir < 4; ++dir) mbmi->interp_filter[dir] = cm->interp_filter;
  } else {
    int dir;

    for (dir = 0; dir < 2; ++dir) {
      const int ctx = av1_get_pred_context_switchable_interp(xd, dir);
      mbmi->interp_filter[dir] = EIGHTTAP_REGULAR;

      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))) {
#if CONFIG_EC_MULTISYMBOL
        mbmi->interp_filter[dir] =
            (InterpFilter)av1_switchable_interp_inv[aom_read_symbol(
                r, ec_ctx->switchable_interp_cdf[ctx], SWITCHABLE_FILTERS,
                ACCT_STR)];
#else
        mbmi->interp_filter[dir] = (InterpFilter)aom_read_tree(
            r, av1_switchable_interp_tree, ec_ctx->switchable_interp_prob[ctx],
            ACCT_STR);
#endif
        if (counts) ++counts->switchable_interp[ctx][mbmi->interp_filter[dir]];
      }
    }
    // The index system works as:
    // (0, 1) -> (vertical, horizontal) filter types for the first ref frame.
    // (2, 3) -> (vertical, horizontal) filter types for the second ref frame.
    mbmi->interp_filter[2] = mbmi->interp_filter[0];
    mbmi->interp_filter[3] = mbmi->interp_filter[1];
  }
#else  // CONFIG_DUAL_FILTER
  if (cm->interp_filter != SWITCHABLE) {
    mbmi->interp_filter = cm->interp_filter;
  } else {
    const int ctx = av1_get_pred_context_switchable_interp(xd);
#if CONFIG_EC_MULTISYMBOL
    mbmi->interp_filter =
        (InterpFilter)av1_switchable_interp_inv[aom_read_symbol(
            r, ec_ctx->switchable_interp_cdf[ctx], SWITCHABLE_FILTERS,
            ACCT_STR)];
#else
    mbmi->interp_filter = (InterpFilter)aom_read_tree(
        r, av1_switchable_interp_tree, ec_ctx->switchable_interp_prob[ctx],
        ACCT_STR);
#endif
    if (counts) ++counts->switchable_interp[ctx][mbmi->interp_filter];
  }
#endif  // CONFIG_DUAL_FILTER
}

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

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

#if CONFIG_CB4X4
  (void)i;
  mbmi->mode = read_intra_mode_y(cm, xd, r, size_group_lookup[bsize]);
#else
  switch (bsize) {
    case BLOCK_4X4:
      for (i = 0; i < 4; ++i)
        mi->bmi[i].as_mode = read_intra_mode_y(cm, xd, r, 0);
      mbmi->mode = mi->bmi[3].as_mode;
      break;
    case BLOCK_4X8:
      mi->bmi[0].as_mode = mi->bmi[2].as_mode = read_intra_mode_y(cm, xd, r, 0);
      mi->bmi[1].as_mode = mi->bmi[3].as_mode = mbmi->mode =
          read_intra_mode_y(cm, xd, r, 0);
      break;
    case BLOCK_8X4:
      mi->bmi[0].as_mode = mi->bmi[1].as_mode = read_intra_mode_y(cm, xd, r, 0);
      mi->bmi[2].as_mode = mi->bmi[3].as_mode = mbmi->mode =
          read_intra_mode_y(cm, xd, r, 0);
      break;
    default:
      mbmi->mode = read_intra_mode_y(cm, xd, r, size_group_lookup[bsize]);
  }
#endif

  mbmi->uv_mode = read_intra_mode_uv(cm, xd, r, mbmi->mode);
#if CONFIG_EXT_INTRA
  read_intra_angle_info(cm, xd, r);
#endif  // CONFIG_EXT_INTRA
#if CONFIG_PALETTE
  mbmi->palette_mode_info.palette_size[0] = 0;
  mbmi->palette_mode_info.palette_size[1] = 0;
  if (bsize >= BLOCK_8X8 && cm->allow_screen_content_tools)
    read_palette_mode_info(cm, xd, r);
#endif  // CONFIG_PALETTE
#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;
  if (bsize >= BLOCK_8X8 || CONFIG_CB4X4)
    read_filter_intra_mode_info(cm, 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 block,
                            int_mv mv[2], int_mv ref_mv[2],
                            int_mv nearest_mv[2], int_mv near_mv[2],
                            int is_compound, int allow_hp, aom_reader *r) {
  int i;
  int ret = 1;
#if CONFIG_EC_ADAPT
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
#else
  FRAME_CONTEXT *ec_ctx = cm->fc;
#endif
#if CONFIG_REF_MV
  MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
#if CONFIG_CB4X4
  int_mv *pred_mv = mbmi->pred_mv;
  (void)block;
#else
  BLOCK_SIZE bsize = mbmi->sb_type;
  int_mv *pred_mv =
      (bsize >= BLOCK_8X8) ? mbmi->pred_mv : xd->mi[0]->bmi[block].pred_mv;
#endif  // CONFIG_CB4X4
#else
  (void)block;
#endif  // CONFIG_REF_MV
  (void)ref_frame;
  (void)cm;

  switch (mode) {
#if CONFIG_EXT_INTER
    case NEWFROMNEARMV:
#endif  // CONFIG_EXT_INTER
    case NEWMV: {
      FRAME_COUNTS *counts = xd->counts;
#if !CONFIG_REF_MV
      nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
#endif
      for (i = 0; i < 1 + is_compound; ++i) {
#if CONFIG_REF_MV
        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_counts *const mv_counts =
            counts ? &counts->mv[nmv_ctx] : NULL;
        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &ec_ctx->nmvc[nmv_ctx],
                mv_counts, allow_hp);
#else
        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &ec_ctx->nmvc, mv_counts,
                allow_hp);
#endif
        ret = ret && is_mv_valid(&mv[i].as_mv);

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

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

#if CONFIG_REF_MV
      pred_mv[0].as_int = near_mv[0].as_int;
      if (is_compound) pred_mv[1].as_int = near_mv[1].as_int;
#endif
      break;
    }
    case ZEROMV: {
#if CONFIG_GLOBAL_MOTION
      mv[0].as_int = gm_get_motion_vector(&cm->global_motion[ref_frame[0]],
                                          cm->allow_high_precision_mv)
                         .as_int;
      if (is_compound)
        mv[1].as_int = gm_get_motion_vector(&cm->global_motion[ref_frame[1]],
                                            cm->allow_high_precision_mv)
                           .as_int;
#else
      mv[0].as_int = 0;
      if (is_compound) mv[1].as_int = 0;
#endif  // CONFIG_GLOBAL_MOTION

#if CONFIG_REF_MV
      pred_mv[0].as_int = 0;
      if (is_compound) pred_mv[1].as_int = 0;
#endif
      break;
    }
#if CONFIG_EXT_INTER
    case NEW_NEWMV: {
      FRAME_COUNTS *counts = xd->counts;
#if !CONFIG_REF_MV
      nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
#endif
      assert(is_compound);
      for (i = 0; i < 2; ++i) {
#if CONFIG_REF_MV
        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_counts *const mv_counts =
            counts ? &counts->mv[nmv_ctx] : NULL;
        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &ec_ctx->nmvc[nmv_ctx],
                mv_counts, allow_hp);
#else
        read_mv(r, &mv[i].as_mv, &ref_mv[i].as_mv, &ec_ctx->nmvc, mv_counts,
                allow_hp);
#endif
        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 NEAREST_NEARMV: {
      assert(is_compound);
      mv[0].as_int = nearest_mv[0].as_int;
      mv[1].as_int = near_mv[1].as_int;
      break;
    }
    case NEAR_NEARESTMV: {
      assert(is_compound);
      mv[0].as_int = near_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: {
      FRAME_COUNTS *counts = xd->counts;
#if CONFIG_REF_MV
      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_counts *const mv_counts =
          counts ? &counts->mv[nmv_ctx] : NULL;
      read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, &ec_ctx->nmvc[nmv_ctx],
              mv_counts, allow_hp);
#else
      nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
      read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, &ec_ctx->nmvc, mv_counts,
              allow_hp);
#endif
      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: {
      FRAME_COUNTS *counts = xd->counts;
#if CONFIG_REF_MV
      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_counts *const mv_counts =
          counts ? &counts->mv[nmv_ctx] : NULL;
      mv[0].as_int = nearest_mv[0].as_int;
      read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, &ec_ctx->nmvc[nmv_ctx],
              mv_counts, allow_hp);
#else
      nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
      mv[0].as_int = nearest_mv[0].as_int;
      read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, &ec_ctx->nmvc, mv_counts,
              allow_hp);
#endif
      assert(is_compound);
      ret = ret && is_mv_valid(&mv[1].as_mv);
      break;
    }
    case NEAR_NEWMV: {
      FRAME_COUNTS *counts = xd->counts;
#if CONFIG_REF_MV
      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_counts *const mv_counts =
          counts ? &counts->mv[nmv_ctx] : NULL;
      mv[0].as_int = near_mv[0].as_int;
      read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, &ec_ctx->nmvc[nmv_ctx],
              mv_counts, allow_hp);
#else
      nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
      mv[0].as_int = near_mv[0].as_int;
      read_mv(r, &mv[1].as_mv, &ref_mv[1].as_mv, &ec_ctx->nmvc, mv_counts,
              allow_hp);
#endif
      assert(is_compound);

      ret = ret && is_mv_valid(&mv[1].as_mv);
      break;
    }
    case NEW_NEARMV: {
      FRAME_COUNTS *counts = xd->counts;
#if CONFIG_REF_MV
      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_counts *const mv_counts =
          counts ? &counts->mv[nmv_ctx] : NULL;
      read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, &ec_ctx->nmvc[nmv_ctx],
              mv_counts, allow_hp);
#else
      nmv_context_counts *const mv_counts = counts ? &counts->mv : NULL;
      read_mv(r, &mv[0].as_mv, &ref_mv[0].as_mv, &ec_ctx->nmvc, mv_counts,
              allow_hp);
#endif
      assert(is_compound);
      ret = ret && is_mv_valid(&mv[0].as_mv);
      mv[1].as_int = near_mv[1].as_int;
      break;
    }
    case ZERO_ZEROMV: {
      assert(is_compound);
#if CONFIG_GLOBAL_MOTION
      mv[0].as_int = gm_get_motion_vector(&cm->global_motion[ref_frame[0]],
                                          cm->allow_high_precision_mv)
                         .as_int;
      mv[1].as_int = gm_get_motion_vector(&cm->global_motion[ref_frame[1]],
                                          cm->allow_high_precision_mv)
                         .as_int;
#else
      mv[0].as_int = 0;
      mv[1].as_int = 0;
#endif  // CONFIG_GLOBAL_MOTION
      break;
    }
#endif  // CONFIG_EXT_INTER
    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;
  } else {
    const int ctx = av1_get_intra_inter_context(xd);
    const int is_inter = aom_read(r, cm->fc->intra_inter_prob[ctx], 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);
}

static void read_inter_block_mode_info(AV1Decoder *const pbi,
                                       MACROBLOCKD *const xd,
                                       MODE_INFO *const mi,
#if (CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION || CONFIG_EXT_INTER) && \
    CONFIG_SUPERTX
                                       int mi_row, int mi_col, aom_reader *r,
                                       int supertx_enabled) {
#else
                                       int mi_row, int mi_col, aom_reader *r) {
#endif  // CONFIG_MOTION_VAR && CONFIG_SUPERTX
  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;
  const int unify_bsize = CONFIG_CB4X4;
  int_mv nearestmv[2], nearmv[2];
  int_mv ref_mvs[MODE_CTX_REF_FRAMES][MAX_MV_REF_CANDIDATES];
#if CONFIG_EXT_INTER
  int mv_idx;
#endif  // CONFIG_EXT_INTER
  int ref, is_compound;
  int16_t inter_mode_ctx[MODE_CTX_REF_FRAMES];
#if CONFIG_REF_MV && CONFIG_EXT_INTER
  int16_t compound_inter_mode_ctx[MODE_CTX_REF_FRAMES];
#endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
  int16_t mode_ctx = 0;
#if CONFIG_WARPED_MOTION
  double pts[SAMPLES_ARRAY_SIZE], pts_inref[SAMPLES_ARRAY_SIZE];
#endif  // CONFIG_WARPED_MOTION
#if CONFIG_EC_ADAPT
  FRAME_CONTEXT *ec_ctx = xd->tile_ctx;
#else
  FRAME_CONTEXT *ec_ctx = cm->fc;
#endif

#if CONFIG_PALETTE
  mbmi->palette_mode_info.palette_size[0] = 0;
  mbmi->palette_mode_info.palette_size[1] = 0;
#endif  // CONFIG_PALETTE

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

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

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

#if CONFIG_REF_MV
  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],
#if CONFIG_EXT_INTER
                     compound_inter_mode_ctx,
#endif  // CONFIG_EXT_INTER
                     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);
#if CONFIG_GLOBAL_MOTION
      zeromv[0].as_int = gm_get_motion_vector(&cm->global_motion[rf[0]],
                                              cm->allow_high_precision_mv)
                             .as_int;
      zeromv[1].as_int = (rf[1] != NONE_FRAME)
                             ? gm_get_motion_vector(&cm->global_motion[rf[1]],
                                                    cm->allow_high_precision_mv)
                                   .as_int
                             : 0;
#else
      zeromv[0].as_int = zeromv[1].as_int = 0;
#endif
      for (ref = 0; ref < 2; ++ref) {
        lower_mv_precision(&ref_mvs[rf[ref]][0].as_mv, allow_hp);
        lower_mv_precision(&ref_mvs[rf[ref]][1].as_mv, allow_hp);
      }

      if (ref_mvs[rf[0]][0].as_int != zeromv[0].as_int ||
          ref_mvs[rf[0]][1].as_int != zeromv[0].as_int ||
          ref_mvs[rf[1]][0].as_int != zeromv[1].as_int ||
          ref_mvs[rf[1]][1].as_int != zeromv[1].as_int)
        inter_mode_ctx[ref_frame] &= ~(1 << ALL_ZERO_FLAG_OFFSET);
    }
  }

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

  if (segfeature_active(&cm->seg, mbmi->segment_id, SEG_LVL_SKIP)) {
    mbmi->mode = ZEROMV;
    if (bsize < BLOCK_8X8) {
      aom_internal_error(xd->error_info, AOM_CODEC_UNSUP_BITSTREAM,
                         "Invalid usage of segement feature on small blocks");
      return;
    }
  } else {
    if (bsize >= BLOCK_8X8 || unify_bsize) {
#if CONFIG_EXT_INTER
      if (is_compound)
        mbmi->mode = read_inter_compound_mode(cm, xd, r, mode_ctx);
      else
#endif  // CONFIG_EXT_INTER
        mbmi->mode = read_inter_mode(ec_ctx, xd,
#if CONFIG_REF_MV && CONFIG_EXT_INTER
                                     mbmi,
#endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
                                     r, mode_ctx);
#if CONFIG_REF_MV
      if (mbmi->mode == NEARMV || mbmi->mode == NEWMV)
        read_drl_idx(cm, xd, mbmi, r);
#endif
    }
  }

#if CONFIG_EXT_INTER
  if ((bsize < BLOCK_8X8 && unify_bsize) ||
      (mbmi->mode != ZEROMV && mbmi->mode != ZERO_ZEROMV)) {
#else
  if ((bsize < BLOCK_8X8 && !unify_bsize) || mbmi->mode != ZEROMV) {
#endif  // CONFIG_EXT_INTER
    for (ref = 0; ref < 1 + is_compound; ++ref) {
      av1_find_best_ref_mvs(allow_hp, ref_mvs[mbmi->ref_frame[ref]],
                            &nearestmv[ref], &nearmv[ref]);
    }
  }

#if CONFIG_REF_MV
  if (mbmi->ref_mv_idx > 0) {
    int_mv cur_mv =
        xd->ref_mv_stack[mbmi->ref_frame[0]][1 + mbmi->ref_mv_idx].this_mv;
    nearmv[0] = cur_mv;
  }

#if CONFIG_EXT_INTER
  if (is_compound && (bsize >= BLOCK_8X8 || unify_bsize) &&
      mbmi->mode != ZERO_ZEROMV) {
#else
  if (is_compound && (bsize >= BLOCK_8X8 || unify_bsize) &&
      mbmi->mode != NEWMV && mbmi->mode != ZEROMV) {
#endif  // CONFIG_EXT_INTER
    uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);

#if CONFIG_EXT_INTER
    if (xd->ref_mv_count[ref_frame_type] > 0) {
#else
    if (xd->ref_mv_count[ref_frame_type] == 1 && mbmi->mode == NEARESTMV) {
#endif  // CONFIG_EXT_INTER
#if CONFIG_EXT_INTER
      if (mbmi->mode == NEAREST_NEARESTMV) {
#endif  // CONFIG_EXT_INTER
        nearestmv[0] = xd->ref_mv_stack[ref_frame_type][0].this_mv;
        nearestmv[1] = xd->ref_mv_stack[ref_frame_type][0].comp_mv;
        lower_mv_precision(&nearestmv[0].as_mv, allow_hp);
        lower_mv_precision(&nearestmv[1].as_mv, allow_hp);
#if CONFIG_EXT_INTER
      } else if (mbmi->mode == NEAREST_NEWMV || mbmi->mode == NEAREST_NEARMV) {
        nearestmv[0] = xd->ref_mv_stack[ref_frame_type][0].this_mv;
        lower_mv_precision(&nearestmv[0].as_mv, allow_hp);
      } else if (mbmi->mode == NEW_NEARESTMV || mbmi->mode == NEAR_NEARESTMV) {
        nearestmv[1] = xd->ref_mv_stack[ref_frame_type][0].comp_mv;
        lower_mv_precision(&nearestmv[1].as_mv, allow_hp);
      }
#endif  // CONFIG_EXT_INTER
    }

#if CONFIG_EXT_INTER
    if (xd->ref_mv_count[ref_frame_type] > 1) {
      if (mbmi->mode == NEAR_NEWMV || mbmi->mode == NEAR_NEARESTMV ||
          mbmi->mode == NEAR_NEARMV) {
        nearmv[0] = xd->ref_mv_stack[ref_frame_type][1].this_mv;
        lower_mv_precision(&nearmv[0].as_mv, allow_hp);
      }

      if (mbmi->mode == NEW_NEARMV || mbmi->mode == NEAREST_NEARMV ||
          mbmi->mode == NEAR_NEARMV) {
        nearmv[1] = xd->ref_mv_stack[ref_frame_type][1].comp_mv;
        lower_mv_precision(&nearmv[1].as_mv, allow_hp);
      }
    }
#else
    if (xd->ref_mv_count[ref_frame_type] > 1) {
      int ref_mv_idx = 1 + mbmi->ref_mv_idx;
      nearestmv[0] = xd->ref_mv_stack[ref_frame_type][0].this_mv;
      nearestmv[1] = xd->ref_mv_stack[ref_frame_type][0].comp_mv;
      nearmv[0] = xd->ref_mv_stack[ref_frame_type][ref_mv_idx].this_mv;
      nearmv[1] = xd->ref_mv_stack[ref_frame_type][ref_mv_idx].comp_mv;
    }
#endif  // CONFIG_EXT_INTER
  }
#endif

#if !CONFIG_DUAL_FILTER && !CONFIG_WARPED_MOTION && !CONFIG_GLOBAL_MOTION
  read_mb_interp_filter(cm, xd, mbmi, r);
#endif  // !CONFIG_DUAL_FILTER && !CONFIG_WARPED_MOTION

  if (bsize < BLOCK_8X8 && !unify_bsize) {
    const int num_4x4_w = 1 << xd->bmode_blocks_wl;
    const int num_4x4_h = 1 << xd->bmode_blocks_hl;
    int idx, idy;
    PREDICTION_MODE b_mode;
    int_mv nearest_sub8x8[2], near_sub8x8[2];
#if CONFIG_EXT_INTER
    int_mv ref_mv[2][2];
#endif  // CONFIG_EXT_INTER
    for (idy = 0; idy < 2; idy += num_4x4_h) {
      for (idx = 0; idx < 2; idx += num_4x4_w) {
        int_mv block[2];
        const int j = idy * 2 + idx;
        int_mv ref_mv_s8[2];
#if CONFIG_REF_MV
#if CONFIG_EXT_INTER
        if (!is_compound)
#endif  // CONFIG_EXT_INTER
          mode_ctx = av1_mode_context_analyzer(inter_mode_ctx, mbmi->ref_frame,
                                               bsize, j);
#endif
#if CONFIG_EXT_INTER
        if (is_compound)
          b_mode = read_inter_compound_mode(cm, xd, r, mode_ctx);
        else
#endif  // CONFIG_EXT_INTER
          b_mode = read_inter_mode(ec_ctx, xd,
#if CONFIG_REF_MV && CONFIG_EXT_INTER
                                   mbmi,
#endif  // CONFIG_REF_MV && CONFIG_EXT_INTER
                                   r, mode_ctx);

#if CONFIG_EXT_INTER
        mv_idx = (b_mode == NEWFROMNEARMV) ? 1 : 0;

        if (b_mode != ZEROMV && b_mode != ZERO_ZEROMV) {
#else
        if (b_mode != ZEROMV) {
#endif  // CONFIG_EXT_INTER
#if CONFIG_REF_MV
          CANDIDATE_MV ref_mv_stack[2][MAX_REF_MV_STACK_SIZE];
          uint8_t ref_mv_count[2];
#endif
          for (ref = 0; ref < 1 + is_compound; ++ref)
#if CONFIG_EXT_INTER
          {
            int_mv mv_ref_list[MAX_MV_REF_CANDIDATES];
            av1_update_mv_context(xd, mi, mbmi->ref_frame[ref], mv_ref_list, j,
                                  mi_row, mi_col, NULL);
#endif  // CONFIG_EXT_INTER
            av1_append_sub8x8_mvs_for_idx(cm, xd, j, ref, mi_row, mi_col,
#if CONFIG_REF_MV
                                          ref_mv_stack[ref], &ref_mv_count[ref],
#endif
#if CONFIG_EXT_INTER
                                          mv_ref_list,
#endif  // CONFIG_EXT_INTER
                                          &nearest_sub8x8[ref],
                                          &near_sub8x8[ref]);
#if CONFIG_EXT_INTER
            if (have_newmv_in_inter_mode(b_mode)) {
              mv_ref_list[0].as_int = nearest_sub8x8[ref].as_int;
              mv_ref_list[1].as_int = near_sub8x8[ref].as_int;
              av1_find_best_ref_mvs(allow_hp, mv_ref_list, &ref_mv[0][ref],
                                    &ref_mv[1][ref]);
            }
          }
#endif  // CONFIG_EXT_INTER
        }

        for (ref = 0; ref < 1 + is_compound && b_mode != ZEROMV; ++ref) {
#if CONFIG_REF_MV
          ref_mv_s8[ref] = nearest_sub8x8[ref];
          lower_mv_precision(&ref_mv_s8[ref].as_mv, allow_hp);
#else
          ref_mv_s8[ref] = nearestmv[ref];
#endif
        }
#if CONFIG_EXT_INTER
        (void)ref_mv_s8;
#endif

        if (!assign_mv(cm, xd, b_mode, mbmi->ref_frame, j, block,
#if CONFIG_EXT_INTER
                       ref_mv[mv_idx],
#else
                       ref_mv_s8,
#endif  // CONFIG_EXT_INTER
                       nearest_sub8x8, near_sub8x8, is_compound, allow_hp, r)) {
          xd->corrupted |= 1;
          break;
        };

        mi->bmi[j].as_mv[0].as_int = block[0].as_int;
        mi->bmi[j].as_mode = b_mode;
        if (is_compound) mi->bmi[j].as_mv[1].as_int = block[1].as_int;

        if (num_4x4_h == 2) mi->bmi[j + 2] = mi->bmi[j];
        if (num_4x4_w == 2) mi->bmi[j + 1] = mi->bmi[j];
      }
    }

#if CONFIG_REF_MV
    mbmi->pred_mv[0].as_int = mi->bmi[3].pred_mv[0].as_int;
    mbmi->pred_mv[1].as_int = mi->bmi[3].pred_mv[1].as_int;
#endif
    mi->mbmi.mode = b_mode;

    mbmi->mv[0].as_int = mi->bmi[3].as_mv[0].as_int;
    mbmi->mv[1].as_int = mi->bmi[3].as_mv[1].as_int;
  } else {
    int_mv ref_mv[2];
    ref_mv[0] = nearestmv[0];
    ref_mv[1] = nearestmv[1];

    for (ref = 0; ref < 1 + is_compound && mbmi->mode == NEWMV; ++ref) {
#if CONFIG_REF_MV
      uint8_t ref_frame_type = av1_ref_frame_type(mbmi->ref_frame);
      if (xd->ref_mv_count[ref_frame_type] > 1) {
        ref_mv[ref] =
            (ref == 0)
                ? xd->ref_mv_stack[ref_frame_type][mbmi->ref_mv_idx].this_mv
                : xd->ref_mv_stack[ref_frame_type][mbmi->ref_mv_idx].comp_mv;
        clamp_mv_ref(&ref_mv[ref].as_mv, xd->n8_w << MI_SIZE_LOG2,
                     xd->n8_h << MI_SIZE_LOG2, xd);
      }
#endif
      nearestmv[ref] = ref_mv[ref];
    }

    xd->corrupted |=
        !assign_mv(cm, xd, mbmi->mode, mbmi->ref_frame, 0, mbmi->mv,
#if CONFIG_EXT_INTER
                   mbmi->mode == NEWFROMNEARMV ? nearmv : nearestmv,
#else
                   ref_mv,
#endif  // CONFIG_EXT_INTER
                   nearestmv, nearmv, is_compound, allow_hp, r);
  }

#if CONFIG_EXT_INTER
  mbmi->use_wedge_interintra = 0;
  if (cm->reference_mode != COMPOUND_REFERENCE &&
#if CONFIG_SUPERTX
      !supertx_enabled &&
#endif
      is_interintra_allowed(mbmi)) {
    const int bsize_group = size_group_lookup[bsize];
    const int interintra =
        aom_read(r, cm->fc->interintra_prob[bsize_group], 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(cm, 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;
#if CONFIG_INTRA_INTERP
      mbmi->intra_filter = INTRA_FILTER_LINEAR;
#endif  // CONFIG_INTRA_INTERP
#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(r, cm->fc->wedge_interintra_prob[bsize], 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;
        }
      }
    }
  }
#endif  // CONFIG_EXT_INTER

#if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
  mbmi->motion_mode = SIMPLE_TRANSLATION;
#if CONFIG_WARPED_MOTION
  if (mbmi->sb_type >= BLOCK_8X8 && !has_second_ref(mbmi))
    mbmi->num_proj_ref[0] = findSamples(cm, xd, mi_row, mi_col, pts, pts_inref);
#endif  // CONFIG_WARPED_MOTION

#if CONFIG_SUPERTX
  if (!supertx_enabled) {
#endif  // CONFIG_SUPERTX
#if CONFIG_EXT_INTER
    if (mbmi->ref_frame[1] != INTRA_FRAME)
#endif  // CONFIG_EXT_INTER
      mbmi->motion_mode = read_motion_mode(cm, xd, mbmi, r);
#if CONFIG_WARPED_MOTION
    if (mbmi->motion_mode == WARPED_CAUSAL) {
      mbmi->wm_params[0].wmtype = DEFAULT_WMTYPE;
      find_projection(mbmi->num_proj_ref[0], pts, pts_inref,
                      &mbmi->wm_params[0]);
    }
#endif  // CONFIG_WARPED_MOTION
#if CONFIG_SUPERTX
  }
#endif  // CONFIG_SUPERTX
#endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION

#if CONFIG_EXT_INTER
  mbmi->interinter_compound_data.type = COMPOUND_AVERAGE;
  if (cm->reference_mode != SINGLE_REFERENCE &&
      is_inter_compound_mode(mbmi->mode)
#if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
      && mbmi->motion_mode == SIMPLE_TRANSLATION
#endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
      ) {
    if (is_any_masked_compound_used(bsize)) {
      mbmi->interinter_compound_data.type =
          aom_read_tree(r, av1_compound_type_tree,
                        cm->fc->compound_type_prob[bsize], ACCT_STR);
      if (mbmi->interinter_compound_data.type == COMPOUND_WEDGE) {
        mbmi->interinter_compound_data.wedge_index =
            aom_read_literal(r, get_wedge_bits_lookup(bsize), ACCT_STR);
        mbmi->interinter_compound_data.wedge_sign = aom_read_bit(r, ACCT_STR);
      }
#if CONFIG_COMPOUND_SEGMENT
      else if (mbmi->interinter_compound_data.type == COMPOUND_SEG) {
        mbmi->interinter_compound_data.mask_type =
            aom_read_literal(r, MAX_SEG_MASK_BITS, ACCT_STR);
      }
#endif  // CONFIG_COMPOUND_SEGMENT
    } else {
      mbmi->interinter_compound_data.type = COMPOUND_AVERAGE;
    }
    if (xd->counts)
      xd->counts
          ->compound_interinter[bsize][mbmi->interinter_compound_data.type]++;
  }
#endif  // CONFIG_EXT_INTER

#if CONFIG_WARPED_MOTION
  if (mbmi->motion_mode != WARPED_CAUSAL) {
#endif  // CONFIG_WARPED_MOTION
#if CONFIG_DUAL_FILTER || CONFIG_WARPED_MOTION || CONFIG_GLOBAL_MOTION
    read_mb_interp_filter(cm, xd, mbmi, r);
#endif  // CONFIG_DUAL_FILTER || CONFIG_WARPED_MOTION
#if CONFIG_WARPED_MOTION
  } else {
#if CONFIG_DUAL_FILTER
    mbmi->interp_filter[0] =
        cm->interp_filter == SWITCHABLE ? EIGHTTAP_REGULAR : cm->interp_filter;
    mbmi->interp_filter[1] =
        cm->interp_filter == SWITCHABLE ? EIGHTTAP_REGULAR : cm->interp_filter;
#else
    mbmi->interp_filter =
        cm->interp_filter == SWITCHABLE ? EIGHTTAP_REGULAR : cm->interp_filter;
#endif  // CONFIG_DUAL_FILTER
  }
#endif  // CONFIG_WARPED_MOTION
}

static void read_inter_frame_mode_info(AV1Decoder *const pbi,
                                       MACROBLOCKD *const xd,
#if CONFIG_SUPERTX
                                       int supertx_enabled,
#endif  // CONFIG_SUPERTX
                                       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;
#if CONFIG_VAR_TX
  BLOCK_SIZE bsize = mbmi->sb_type;
#endif  // CONFIG_VAR_TX

  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, r);
#if CONFIG_SUPERTX
  if (!supertx_enabled)
#endif  // CONFIG_SUPERTX
    mbmi->skip = read_skip(cm, xd, mbmi->segment_id, r);

#if CONFIG_DELTA_Q
  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;
    xd->prev_qindex = xd->current_qindex;
  }
#endif

#if CONFIG_SUPERTX
  if (!supertx_enabled) {
#endif  // CONFIG_SUPERTX
    inter_block = read_is_inter_block(cm, xd, mbmi->segment_id, r);

#if CONFIG_VAR_TX
    xd->above_txfm_context = cm->above_txfm_context + mi_col;
    xd->left_txfm_context =
        xd->left_txfm_context_buffer + (mi_row & MAX_MIB_MASK);

    if (cm->tx_mode == TX_MODE_SELECT &&
#if CONFIG_CB4X4
        bsize > BLOCK_4X4 &&
#else
        bsize >= BLOCK_8X8 &&
#endif
        !mbmi->skip && inter_block) {
      const TX_SIZE max_tx_size = max_txsize_rect_lookup[bsize];
      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];
      int idx, idy;

      mbmi->min_tx_size = TX_SIZES_ALL;
      for (idy = 0; idy < height; idy += bh)
        for (idx = 0; idx < width; idx += bw)
          read_tx_size_vartx(cm, xd, mbmi, xd->counts, max_tx_size,
                             height != width, 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];
        int idx, idy;
        for (idy = 0; idy < height; ++idy)
          for (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);
    }
#else
  mbmi->tx_size = read_tx_size(cm, xd, inter_block, !mbmi->skip, r);
#endif  // CONFIG_VAR_TX
#if CONFIG_SUPERTX
  }
#if CONFIG_VAR_TX
  else if (inter_block) {
    const int width = num_4x4_blocks_wide_lookup[bsize];
    const int height = num_4x4_blocks_high_lookup[bsize];
    int idx, idy;
    xd->mi[0]->mbmi.tx_size = xd->supertx_size;
    for (idy = 0; idy < height; ++idy)
      for (idx = 0; idx < width; ++idx)
        xd->mi[0]->mbmi.inter_tx_size[idy >> 1][idx >> 1] = xd->supertx_size;
  }
#endif  // CONFIG_VAR_TX
#endif  // CONFIG_SUPERTX

  if (inter_block)
    read_inter_block_mode_info(pbi, xd,
#if (CONFIG_MOTION_VAR || CONFIG_EXT_INTER || CONFIG_WARPED_MOTION) && \
    CONFIG_SUPERTX

                               mi, mi_row, mi_col, r, supertx_enabled);
#else
                               mi, mi_row, mi_col, r);
#endif  // CONFIG_MOTION_VAR && CONFIG_SUPERTX
  else
    read_intra_block_mode_info(cm, xd, mi, r);

  read_tx_type(cm, xd, mbmi,
#if CONFIG_SUPERTX
               supertx_enabled,
#endif
               r);
}

void av1_read_mode_info(AV1Decoder *const pbi, MACROBLOCKD *xd,
#if CONFIG_SUPERTX
                        int supertx_enabled,
#endif  // CONFIG_SUPERTX
                        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];
  MV_REF *frame_mvs = cm->cur_frame->mvs + mi_row * cm->mi_cols + mi_col;
  int w, h;

  if (frame_is_intra_only(cm)) {
    read_intra_frame_mode_info(cm, xd, mi_row, mi_col, r);
#if CONFIG_REF_MV
    for (h = 0; h < y_mis; ++h) {
      MV_REF *const frame_mv = frame_mvs + h * cm->mi_cols;
      for (w = 0; w < x_mis; ++w) {
        MV_REF *const mv = frame_mv + w;
        mv->ref_frame[0] = NONE_FRAME;
        mv->ref_frame[1] = NONE_FRAME;
      }
    }
#endif
  } else {
    read_inter_frame_mode_info(pbi, xd,
#if CONFIG_SUPERTX
                               supertx_enabled,
#endif  // CONFIG_SUPERTX
                               mi_row, mi_col, r);
    for (h = 0; h < y_mis; ++h) {
      MV_REF *const frame_mv = frame_mvs + h * cm->mi_cols;
      for (w = 0; w < x_mis; ++w) {
        MV_REF *const mv = frame_mv + w;
        mv->ref_frame[0] = mi->mbmi.ref_frame[0];
        mv->ref_frame[1] = mi->mbmi.ref_frame[1];
        mv->mv[0].as_int = mi->mbmi.mv[0].as_int;
        mv->mv[1].as_int = mi->mbmi.mv[1].as_int;
#if CONFIG_REF_MV
        mv->pred_mv[0].as_int = mi->mbmi.pred_mv[0].as_int;
        mv->pred_mv[1].as_int = mi->mbmi.pred_mv[1].as_int;
#endif
      }
    }
  }
}