av1/decoder/decodeframe.c

/*
 * 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 <stdlib.h>  // qsort()

#include "./aom_config.h"
#include "./aom_dsp_rtcd.h"
#include "./aom_scale_rtcd.h"
#include "./av1_rtcd.h"

#include "aom/aom_codec.h"
#include "aom_dsp/aom_dsp_common.h"
#include "aom_dsp/bitreader.h"
#include "aom_dsp/bitreader_buffer.h"
#include "aom_mem/aom_mem.h"
#include "aom_ports/mem.h"
#include "aom_ports/mem_ops.h"
#include "aom_scale/aom_scale.h"
#include "aom_util/aom_thread.h"

#include "av1/common/alloccommon.h"
#if CONFIG_CLPF
#include "aom/aom_image.h"
#include "av1/common/clpf.h"
#endif
#include "av1/common/common.h"
#if CONFIG_DERING
#include "av1/common/dering.h"
#endif  // CONFIG_DERING
#include "av1/common/entropy.h"
#include "av1/common/entropymode.h"
#include "av1/common/entropymv.h"
#include "av1/common/idct.h"
#include "av1/common/pred_common.h"
#include "av1/common/quant_common.h"
#include "av1/common/reconinter.h"
#include "av1/common/reconintra.h"
#include "av1/common/seg_common.h"
#include "av1/common/thread_common.h"
#include "av1/common/tile_common.h"

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

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

#define MAX_AV1_HEADER_SIZE 80
#define ACCT_STR __func__

#if CONFIG_PVQ
#include "av1/decoder/pvq_decoder.h"
#include "av1/common/pvq.h"
#include "av1/encoder/encodemb.h"

#include "av1/common/partition.h"
#include "av1/decoder/decint.h"
#include "av1/encoder/hybrid_fwd_txfm.h"
#endif

static struct aom_read_bit_buffer *init_read_bit_buffer(
    AV1Decoder *pbi, struct aom_read_bit_buffer *rb, const uint8_t *data,
    const uint8_t *data_end, uint8_t clear_data[MAX_AV1_HEADER_SIZE]);
static int read_compressed_header(AV1Decoder *pbi, const uint8_t *data,
                                  size_t partition_size);
static size_t read_uncompressed_header(AV1Decoder *pbi,
                                       struct aom_read_bit_buffer *rb);

static int is_compound_reference_allowed(const AV1_COMMON *cm) {
  int i;
  if (frame_is_intra_only(cm)) return 0;
  for (i = 1; i < INTER_REFS_PER_FRAME; ++i)
    if (cm->ref_frame_sign_bias[i + 1] != cm->ref_frame_sign_bias[1]) return 1;

  return 0;
}

static void setup_compound_reference_mode(AV1_COMMON *cm) {
#if CONFIG_EXT_REFS
  cm->comp_fwd_ref[0] = LAST_FRAME;
  cm->comp_fwd_ref[1] = LAST2_FRAME;
  cm->comp_fwd_ref[2] = LAST3_FRAME;
  cm->comp_fwd_ref[3] = GOLDEN_FRAME;

  cm->comp_bwd_ref[0] = BWDREF_FRAME;
  cm->comp_bwd_ref[1] = ALTREF_FRAME;
#else
  if (cm->ref_frame_sign_bias[LAST_FRAME] ==
      cm->ref_frame_sign_bias[GOLDEN_FRAME]) {
    cm->comp_fixed_ref = ALTREF_FRAME;
    cm->comp_var_ref[0] = LAST_FRAME;
    cm->comp_var_ref[1] = GOLDEN_FRAME;
  } else if (cm->ref_frame_sign_bias[LAST_FRAME] ==
             cm->ref_frame_sign_bias[ALTREF_FRAME]) {
    cm->comp_fixed_ref = GOLDEN_FRAME;
    cm->comp_var_ref[0] = LAST_FRAME;
    cm->comp_var_ref[1] = ALTREF_FRAME;
  } else {
    cm->comp_fixed_ref = LAST_FRAME;
    cm->comp_var_ref[0] = GOLDEN_FRAME;
    cm->comp_var_ref[1] = ALTREF_FRAME;
  }
#endif  // CONFIG_EXT_REFS
}

static int read_is_valid(const uint8_t *start, size_t len, const uint8_t *end) {
  return len != 0 && len <= (size_t)(end - start);
}

static int decode_unsigned_max(struct aom_read_bit_buffer *rb, int max) {
  const int data = aom_rb_read_literal(rb, get_unsigned_bits(max));
  return data > max ? max : data;
}

static TX_MODE read_tx_mode(struct aom_read_bit_buffer *rb) {
#if CONFIG_TX64X64
  TX_MODE tx_mode =
      aom_rb_read_bit(rb) ? TX_MODE_SELECT : aom_rb_read_literal(rb, 2);
  if (tx_mode == ALLOW_32X32) tx_mode += aom_rb_read_bit(rb);
  return tx_mode;
#else
  return aom_rb_read_bit(rb) ? TX_MODE_SELECT : aom_rb_read_literal(rb, 2);
#endif  // CONFIG_TX64X64
}

static void read_tx_size_probs(FRAME_CONTEXT *fc, aom_reader *r) {
  int i, j, k;
  for (i = 0; i < MAX_TX_DEPTH; ++i)
    for (j = 0; j < TX_SIZE_CONTEXTS; ++j)
      for (k = 0; k < i + 1; ++k)
        av1_diff_update_prob(r, &fc->tx_size_probs[i][j][k], ACCT_STR);
}

#if !CONFIG_EC_ADAPT
static void read_switchable_interp_probs(FRAME_CONTEXT *fc, aom_reader *r) {
  int i, j;
  for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j) {
    for (i = 0; i < SWITCHABLE_FILTERS - 1; ++i)
      av1_diff_update_prob(r, &fc->switchable_interp_prob[j][i], ACCT_STR);
  }
}
#endif

static void read_inter_mode_probs(FRAME_CONTEXT *fc, aom_reader *r) {
#if CONFIG_REF_MV
  int i;
  for (i = 0; i < NEWMV_MODE_CONTEXTS; ++i)
    av1_diff_update_prob(r, &fc->newmv_prob[i], ACCT_STR);
  for (i = 0; i < ZEROMV_MODE_CONTEXTS; ++i)
    av1_diff_update_prob(r, &fc->zeromv_prob[i], ACCT_STR);
  for (i = 0; i < REFMV_MODE_CONTEXTS; ++i)
    av1_diff_update_prob(r, &fc->refmv_prob[i], ACCT_STR);
  for (i = 0; i < DRL_MODE_CONTEXTS; ++i)
    av1_diff_update_prob(r, &fc->drl_prob[i], ACCT_STR);
#if CONFIG_EXT_INTER
  av1_diff_update_prob(r, &fc->new2mv_prob, ACCT_STR);
#endif  // CONFIG_EXT_INTER
#else
#if !CONFIG_EC_ADAPT
  int i, j;
  for (i = 0; i < INTER_MODE_CONTEXTS; ++i) {
    for (j = 0; j < INTER_MODES - 1; ++j)
      av1_diff_update_prob(r, &fc->inter_mode_probs[i][j], ACCT_STR);
  }
#else
  (void)fc;
  (void)r;
#endif
#endif
}

#if CONFIG_EXT_INTER
static void read_inter_compound_mode_probs(FRAME_CONTEXT *fc, aom_reader *r) {
  int i, j;
  if (aom_read(r, GROUP_DIFF_UPDATE_PROB, ACCT_STR)) {
    for (j = 0; j < INTER_MODE_CONTEXTS; ++j) {
      for (i = 0; i < INTER_COMPOUND_MODES - 1; ++i) {
        av1_diff_update_prob(r, &fc->inter_compound_mode_probs[j][i], ACCT_STR);
      }
    }
  }
}
#endif  // CONFIG_EXT_INTER
#if !CONFIG_EC_ADAPT
#if !CONFIG_EXT_TX
static void read_ext_tx_probs(FRAME_CONTEXT *fc, aom_reader *r) {
  int i, j, k;
  if (aom_read(r, GROUP_DIFF_UPDATE_PROB, ACCT_STR)) {
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
      for (j = 0; j < TX_TYPES; ++j) {
        for (k = 0; k < TX_TYPES - 1; ++k)
          av1_diff_update_prob(r, &fc->intra_ext_tx_prob[i][j][k], ACCT_STR);
      }
    }
  }
  if (aom_read(r, GROUP_DIFF_UPDATE_PROB, ACCT_STR)) {
    for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
      for (k = 0; k < TX_TYPES - 1; ++k)
        av1_diff_update_prob(r, &fc->inter_ext_tx_prob[i][k], ACCT_STR);
    }
  }
}
#endif
#endif

static REFERENCE_MODE read_frame_reference_mode(
    const AV1_COMMON *cm, struct aom_read_bit_buffer *rb) {
  if (is_compound_reference_allowed(cm)) {
    return aom_rb_read_bit(rb)
               ? REFERENCE_MODE_SELECT
               : (aom_rb_read_bit(rb) ? COMPOUND_REFERENCE : SINGLE_REFERENCE);
  } else {
    return SINGLE_REFERENCE;
  }
}

static void read_frame_reference_mode_probs(AV1_COMMON *cm, aom_reader *r) {
  FRAME_CONTEXT *const fc = cm->fc;
  int i, j;

  if (cm->reference_mode == REFERENCE_MODE_SELECT)
    for (i = 0; i < COMP_INTER_CONTEXTS; ++i)
      av1_diff_update_prob(r, &fc->comp_inter_prob[i], ACCT_STR);

  if (cm->reference_mode != COMPOUND_REFERENCE) {
    for (i = 0; i < REF_CONTEXTS; ++i) {
      for (j = 0; j < (SINGLE_REFS - 1); ++j) {
        av1_diff_update_prob(r, &fc->single_ref_prob[i][j], ACCT_STR);
      }
    }
  }

  if (cm->reference_mode != SINGLE_REFERENCE) {
    for (i = 0; i < REF_CONTEXTS; ++i) {
#if CONFIG_EXT_REFS
      for (j = 0; j < (FWD_REFS - 1); ++j)
        av1_diff_update_prob(r, &fc->comp_ref_prob[i][j], ACCT_STR);
      for (j = 0; j < (BWD_REFS - 1); ++j)
        av1_diff_update_prob(r, &fc->comp_bwdref_prob[i][j], ACCT_STR);
#else
      for (j = 0; j < (COMP_REFS - 1); ++j)
        av1_diff_update_prob(r, &fc->comp_ref_prob[i][j], ACCT_STR);
#endif  // CONFIG_EXT_REFS
    }
  }
}

static void update_mv_probs(aom_prob *p, int n, aom_reader *r) {
  int i;
  for (i = 0; i < n; ++i) av1_diff_update_prob(r, &p[i], ACCT_STR);
}

static void read_mv_probs(nmv_context *ctx, int allow_hp, aom_reader *r) {
  int i;

#if !CONFIG_EC_ADAPT
  int j;
  update_mv_probs(ctx->joints, MV_JOINTS - 1, r);

  for (i = 0; i < 2; ++i) {
    nmv_component *const comp_ctx = &ctx->comps[i];
    update_mv_probs(&comp_ctx->sign, 1, r);
    update_mv_probs(comp_ctx->classes, MV_CLASSES - 1, r);
    update_mv_probs(comp_ctx->class0, CLASS0_SIZE - 1, r);
    update_mv_probs(comp_ctx->bits, MV_OFFSET_BITS, r);
  }
  for (i = 0; i < 2; ++i) {
    nmv_component *const comp_ctx = &ctx->comps[i];
    for (j = 0; j < CLASS0_SIZE; ++j) {
      update_mv_probs(comp_ctx->class0_fp[j], MV_FP_SIZE - 1, r);
    }
    update_mv_probs(comp_ctx->fp, MV_FP_SIZE - 1, r);
  }
#endif  // !CONFIG_EC_ADAPT

  if (allow_hp) {
    for (i = 0; i < 2; ++i) {
      nmv_component *const comp_ctx = &ctx->comps[i];
      update_mv_probs(&comp_ctx->class0_hp, 1, r);
      update_mv_probs(&comp_ctx->hp, 1, r);
    }
  }
}

static void inverse_transform_block(MACROBLOCKD *xd, int plane,
                                    const TX_TYPE tx_type,
                                    const TX_SIZE tx_size, uint8_t *dst,
                                    int stride, int16_t scan_line, int eob) {
  struct macroblockd_plane *const pd = &xd->plane[plane];
  tran_low_t *const dqcoeff = pd->dqcoeff;
  INV_TXFM_PARAM inv_txfm_param;
  inv_txfm_param.tx_type = tx_type;
  inv_txfm_param.tx_size = tx_size;
  inv_txfm_param.eob = eob;
  inv_txfm_param.lossless = xd->lossless[xd->mi[0]->mbmi.segment_id];

#if CONFIG_AOM_HIGHBITDEPTH
  if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
    inv_txfm_param.bd = xd->bd;
    highbd_inv_txfm_add(dqcoeff, dst, stride, &inv_txfm_param);
  } else {
#endif  // CONFIG_AOM_HIGHBITDEPTH
    inv_txfm_add(dqcoeff, dst, stride, &inv_txfm_param);
#if CONFIG_AOM_HIGHBITDEPTH
  }
#endif  // CONFIG_AOM_HIGHBITDEPTH
  memset(dqcoeff, 0, (scan_line + 1) * sizeof(dqcoeff[0]));
}

#if CONFIG_PVQ
static int av1_pvq_decode_helper(od_dec_ctx *dec, int16_t *ref_coeff,
                                 int16_t *dqcoeff, int16_t *quant, int pli,
                                 int bs, TX_TYPE tx_type, int xdec,
                                 int ac_dc_coded) {
  unsigned int flags;  // used for daala's stream analyzer.
  int off;
  const int is_keyframe = 0;
  const int has_dc_skip = 1;
  int quant_shift = get_tx_scale(bs);
  // DC quantizer for PVQ
  int pvq_dc_quant;
  int lossless = (quant[0] == 0);
  const int blk_size = tx_size_wide[bs];
  int eob = 0;
  int i;
  int use_activity_masking = dec->use_activity_masking;
  DECLARE_ALIGNED(16, int16_t, dqcoeff_pvq[OD_TXSIZE_MAX * OD_TXSIZE_MAX]);
  DECLARE_ALIGNED(16, int16_t, ref_coeff_pvq[OD_TXSIZE_MAX * OD_TXSIZE_MAX]);

  od_coeff ref_int32[OD_TXSIZE_MAX * OD_TXSIZE_MAX];
  od_coeff out_int32[OD_TXSIZE_MAX * OD_TXSIZE_MAX];

  od_raster_to_coding_order(ref_coeff_pvq, blk_size, tx_type, ref_coeff,
                            blk_size);

  if (lossless)
    pvq_dc_quant = 1;
  else {
    if (use_activity_masking)
      pvq_dc_quant = OD_MAXI(
          1, (quant[0] >> quant_shift) *
                     dec->state.pvq_qm_q4[pli][od_qm_get_index(bs, 0)] >>
                 4);
    else
      pvq_dc_quant = OD_MAXI(1, quant[0] >> quant_shift);
  }

  off = od_qm_offset(bs, xdec);

  // copy int16 inputs to int32
  for (i = 0; i < blk_size * blk_size; i++) ref_int32[i] = ref_coeff_pvq[i];

  od_pvq_decode(dec, ref_int32, out_int32, (int)quant[1] >> quant_shift, pli,
                bs, OD_PVQ_BETA[use_activity_masking][pli][bs],
                OD_ROBUST_STREAM, is_keyframe, &flags, ac_dc_coded,
                dec->state.qm + off, dec->state.qm_inv + off);

  // copy int32 result back to int16
  for (i = 0; i < blk_size * blk_size; i++) dqcoeff_pvq[i] = out_int32[i];

  if (!has_dc_skip || dqcoeff_pvq[0]) {
    dqcoeff_pvq[0] =
        has_dc_skip + generic_decode(dec->r, &dec->state.adapt.model_dc[pli],
                                     -1, &dec->state.adapt.ex_dc[pli][bs][0], 2,
                                     "dc:mag");
    if (dqcoeff_pvq[0])
      dqcoeff_pvq[0] *= aom_read_bit(dec->r, "dc:sign") ? -1 : 1;
  }
  dqcoeff_pvq[0] = dqcoeff_pvq[0] * pvq_dc_quant + ref_coeff_pvq[0];

  od_coding_order_to_raster(dqcoeff, blk_size, tx_type, dqcoeff_pvq, blk_size);

  eob = blk_size * blk_size;

  return eob;
}

static int av1_pvq_decode_helper2(MACROBLOCKD *const xd,
                                  MB_MODE_INFO *const mbmi, int plane, int row,
                                  int col, TX_SIZE tx_size, TX_TYPE tx_type) {
  struct macroblockd_plane *const pd = &xd->plane[plane];
  // transform block size in pixels
  int tx_blk_size = tx_size_wide[tx_size];
  int i, j;
  tran_low_t *pvq_ref_coeff = pd->pvq_ref_coeff;
  const int diff_stride = tx_blk_size;
  int16_t *pred = pd->pred;
  tran_low_t *const dqcoeff = pd->dqcoeff;
  int ac_dc_coded;  // bit0: DC coded, bit1 : AC coded
  uint8_t *dst;
  int eob;

  eob = 0;
  dst = &pd->dst.buf[4 * row * pd->dst.stride + 4 * col];

  // decode ac/dc coded flag. bit0: DC coded, bit1 : AC coded
  // NOTE : we don't use 5 symbols for luma here in aom codebase,
  // since block partition is taken care of by aom.
  // So, only AC/DC skip info is coded
  ac_dc_coded = aom_decode_cdf_adapt(
      xd->daala_dec.r,
      xd->daala_dec.state.adapt.skip_cdf[2 * tx_size + (plane != 0)], 4,
      xd->daala_dec.state.adapt.skip_increment, "skip");
  if (ac_dc_coded) {
    int xdec = pd->subsampling_x;
    int seg_id = mbmi->segment_id;
    int16_t *quant;
    FWD_TXFM_PARAM fwd_txfm_param;
    // ToDo(yaowu): correct this with optimal number from decoding process.
    const int max_scan_line = tx_size_2d[tx_size];

    for (j = 0; j < tx_blk_size; j++)
      for (i = 0; i < tx_blk_size; i++) {
        pred[diff_stride * j + i] = dst[pd->dst.stride * j + i];
      }

    fwd_txfm_param.tx_type = tx_type;
    fwd_txfm_param.tx_size = tx_size;
    fwd_txfm_param.lossless = xd->lossless[seg_id];

    fwd_txfm(pred, pvq_ref_coeff, diff_stride, &fwd_txfm_param);

    quant = &pd->seg_dequant[seg_id][0];  // aom's quantizer

    eob = av1_pvq_decode_helper(&xd->daala_dec, pvq_ref_coeff, dqcoeff, quant,
                                plane, tx_size, tx_type, xdec, ac_dc_coded);

    // Since av1 does not have separate inverse transform
    // but also contains adding to predicted image,
    // pass blank dummy image to av1_inv_txfm_add_*x*(), i.e. set dst as zeros
    for (j = 0; j < tx_blk_size; j++)
      for (i = 0; i < tx_blk_size; i++) dst[j * pd->dst.stride + i] = 0;

    inverse_transform_block(xd, plane, tx_type, tx_size, dst, pd->dst.stride,
                            max_scan_line, eob);
  }

  return eob;
}
#endif

static void predict_and_reconstruct_intra_block(AV1_COMMON *cm,
                                                MACROBLOCKD *const xd,
#if CONFIG_ANS
                                                struct AnsDecoder *const r,
#else
                                                aom_reader *r,
#endif  // CONFIG_ANS
                                                MB_MODE_INFO *const mbmi,
                                                int plane, int row, int col,
                                                TX_SIZE tx_size) {
  struct macroblockd_plane *const pd = &xd->plane[plane];
  PREDICTION_MODE mode = (plane == 0) ? mbmi->mode : mbmi->uv_mode;
  PLANE_TYPE plane_type = (plane == 0) ? PLANE_TYPE_Y : PLANE_TYPE_UV;
  uint8_t *dst;
  int block_idx = (row << 1) + col;
#if CONFIG_PVQ
  (void)cm;
  (void)r;
#endif
  dst = &pd->dst.buf[(row * pd->dst.stride + col) << tx_size_wide_log2[0]];

#if !CONFIG_CB4X4
  if (mbmi->sb_type < BLOCK_8X8)
    if (plane == 0) mode = xd->mi[0]->bmi[(row << 1) + col].as_mode;
#endif

  av1_predict_intra_block(xd, pd->width, pd->height, tx_size, mode, dst,
                          pd->dst.stride, dst, pd->dst.stride, col, row, plane);

  if (!mbmi->skip) {
    TX_TYPE tx_type = get_tx_type(plane_type, xd, block_idx, tx_size);
#if !CONFIG_PVQ
    const SCAN_ORDER *scan_order = get_scan(cm, tx_size, tx_type, 0);
    int16_t max_scan_line = 0;
    const int eob =
        av1_decode_block_tokens(xd, plane, scan_order, col, row, tx_size,
                                tx_type, &max_scan_line, r, mbmi->segment_id);
#if CONFIG_ADAPT_SCAN
    av1_update_scan_count_facade(cm, tx_size, tx_type, pd->dqcoeff, eob);
#endif
    if (eob)
      inverse_transform_block(xd, plane, tx_type, tx_size, dst, pd->dst.stride,
                              max_scan_line, eob);
#else
    av1_pvq_decode_helper2(xd, mbmi, plane, row, col, tx_size, tx_type);
#endif
  }
}

#if CONFIG_VAR_TX
static void decode_reconstruct_tx(AV1_COMMON *cm, MACROBLOCKD *const xd,
                                  aom_reader *r, MB_MODE_INFO *const mbmi,
                                  int plane, BLOCK_SIZE plane_bsize,
                                  int blk_row, int blk_col, TX_SIZE tx_size,
                                  int *eob_total) {
  const struct macroblockd_plane *const pd = &xd->plane[plane];
  const BLOCK_SIZE bsize = txsize_to_bsize[tx_size];
  const int tx_row = blk_row >> (1 - pd->subsampling_y);
  const int tx_col = blk_col >> (1 - pd->subsampling_x);
  const TX_SIZE plane_tx_size =
      plane ? uv_txsize_lookup[bsize][mbmi->inter_tx_size[tx_row][tx_col]][0][0]
            : mbmi->inter_tx_size[tx_row][tx_col];
  // Scale to match transform block unit.
  const int max_blocks_high = max_block_high(xd, plane_bsize, plane);
  const int max_blocks_wide = max_block_wide(xd, plane_bsize, plane);

  if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide) return;

  if (tx_size == plane_tx_size) {
    PLANE_TYPE plane_type = (plane == 0) ? PLANE_TYPE_Y : PLANE_TYPE_UV;
    int block_idx = (blk_row << 1) + blk_col;
    TX_TYPE tx_type = get_tx_type(plane_type, xd, block_idx, plane_tx_size);
    const SCAN_ORDER *sc = get_scan(cm, plane_tx_size, tx_type, 1);
    int16_t max_scan_line = 0;
    const int eob =
        av1_decode_block_tokens(xd, plane, sc, blk_col, blk_row, plane_tx_size,
                                tx_type, &max_scan_line, r, mbmi->segment_id);
    inverse_transform_block(xd, plane, tx_type, plane_tx_size,
                            &pd->dst.buf[(blk_row * pd->dst.stride + blk_col)
                                         << tx_size_wide_log2[0]],
                            pd->dst.stride, max_scan_line, eob);
    *eob_total += eob;
  } else {
    const TX_SIZE sub_txs = sub_tx_size_map[tx_size];
    const int bsl = tx_size_wide_unit[sub_txs];
    int i;

    assert(bsl > 0);

    for (i = 0; i < 4; ++i) {
      const int offsetr = blk_row + (i >> 1) * bsl;
      const int offsetc = blk_col + (i & 0x01) * bsl;

      if (offsetr >= max_blocks_high || offsetc >= max_blocks_wide) continue;

      decode_reconstruct_tx(cm, xd, r, mbmi, plane, plane_bsize, offsetr,
                            offsetc, sub_txs, eob_total);
    }
  }
}
#endif  // CONFIG_VAR_TX

#if !CONFIG_VAR_TX || CONFIG_SUPERTX || \
    (!CONFIG_VAR_TX && CONFIG_EXT_TX && CONFIG_RECT_TX)
static int reconstruct_inter_block(AV1_COMMON *cm, MACROBLOCKD *const xd,
#if CONFIG_ANS
                                   struct AnsDecoder *const r,
#else
                                   aom_reader *r,
#endif
                                   int segment_id, int plane, int row, int col,
                                   TX_SIZE tx_size) {
  PLANE_TYPE plane_type = (plane == 0) ? PLANE_TYPE_Y : PLANE_TYPE_UV;
  int block_idx = (row << 1) + col;
  TX_TYPE tx_type = get_tx_type(plane_type, xd, block_idx, tx_size);
#if CONFIG_PVQ
  int eob;
  (void)cm;
  (void)r;
  (void)segment_id;
#else
  struct macroblockd_plane *const pd = &xd->plane[plane];
#endif

#if !CONFIG_PVQ
  const SCAN_ORDER *scan_order = get_scan(cm, tx_size, tx_type, 1);
  int16_t max_scan_line = 0;
  const int eob =
      av1_decode_block_tokens(xd, plane, scan_order, col, row, tx_size, tx_type,
                              &max_scan_line, r, segment_id);
  uint8_t *dst =
      &pd->dst.buf[(row * pd->dst.stride + col) << tx_size_wide_log2[0]];
#if CONFIG_ADAPT_SCAN
  av1_update_scan_count_facade(cm, tx_size, tx_type, pd->dqcoeff, eob);
#endif
  if (eob)
    inverse_transform_block(xd, plane, tx_type, tx_size, dst, pd->dst.stride,
                            max_scan_line, eob);
#else
  eob = av1_pvq_decode_helper2(xd, &xd->mi[0]->mbmi, plane, row, col, tx_size,
                               tx_type);
#endif
  return eob;
}
#endif  // !CONFIG_VAR_TX || CONFIG_SUPER_TX

static MB_MODE_INFO *set_offsets(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                 BLOCK_SIZE bsize, int mi_row, int mi_col,
                                 int bw, int bh, int x_mis, int y_mis) {
  const int offset = mi_row * cm->mi_stride + mi_col;
  int x, y;
  const TileInfo *const tile = &xd->tile;

  xd->mi = cm->mi_grid_visible + offset;
  xd->mi[0] = &cm->mi[offset];
  // TODO(slavarnway): Generate sb_type based on bwl and bhl, instead of
  // passing bsize from decode_partition().
  xd->mi[0]->mbmi.sb_type = bsize;
#if CONFIG_RD_DEBUG
  xd->mi[0]->mbmi.mi_row = mi_row;
  xd->mi[0]->mbmi.mi_col = mi_col;
#endif
  for (y = 0; y < y_mis; ++y)
    for (x = !y; x < x_mis; ++x) xd->mi[y * cm->mi_stride + x] = xd->mi[0];

  set_plane_n4(xd, bw, bh);
  set_skip_context(xd, mi_row, mi_col);

#if CONFIG_VAR_TX
  xd->max_tx_size = max_txsize_lookup[bsize];
#endif

  // Distance of Mb to the various image edges. These are specified to 8th pel
  // as they are always compared to values that are in 1/8th pel units
  set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw, cm->mi_rows, cm->mi_cols);

  av1_setup_dst_planes(xd->plane, get_frame_new_buffer(cm), mi_row, mi_col);
  return &xd->mi[0]->mbmi;
}

#if CONFIG_SUPERTX
static MB_MODE_INFO *set_offsets_extend(AV1_COMMON *const cm,
                                        MACROBLOCKD *const xd,
                                        const TileInfo *const tile,
                                        BLOCK_SIZE bsize_pred, int mi_row_pred,
                                        int mi_col_pred, int mi_row_ori,
                                        int mi_col_ori) {
  // Used in supertx
  // (mi_row_ori, mi_col_ori): location for mv
  // (mi_row_pred, mi_col_pred, bsize_pred): region to predict
  const int bw = mi_size_wide[bsize_pred];
  const int bh = mi_size_high[bsize_pred];
  const int offset = mi_row_ori * cm->mi_stride + mi_col_ori;
  xd->mi = cm->mi_grid_visible + offset;
  xd->mi[0] = cm->mi + offset;
  set_mi_row_col(xd, tile, mi_row_pred, bh, mi_col_pred, bw, cm->mi_rows,
                 cm->mi_cols);

  xd->up_available = (mi_row_ori > tile->mi_row_start);
  xd->left_available = (mi_col_ori > tile->mi_col_start);

  set_plane_n4(xd, bw, bh);

  return &xd->mi[0]->mbmi;
}

static MB_MODE_INFO *set_mb_offsets(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                    BLOCK_SIZE bsize, int mi_row, int mi_col,
                                    int bw, int bh, int x_mis, int y_mis) {
  const int offset = mi_row * cm->mi_stride + mi_col;
  const TileInfo *const tile = &xd->tile;
  int x, y;

  xd->mi = cm->mi_grid_visible + offset;
  xd->mi[0] = cm->mi + offset;
  xd->mi[0]->mbmi.sb_type = bsize;
  for (y = 0; y < y_mis; ++y)
    for (x = !y; x < x_mis; ++x) xd->mi[y * cm->mi_stride + x] = xd->mi[0];

  set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw, cm->mi_rows, cm->mi_cols);
  return &xd->mi[0]->mbmi;
}

static void set_offsets_topblock(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                                 const TileInfo *const tile, BLOCK_SIZE bsize,
                                 int mi_row, int mi_col) {
  const int bw = mi_size_wide[bsize];
  const int bh = mi_size_high[bsize];
  const int offset = mi_row * cm->mi_stride + mi_col;

  xd->mi = cm->mi_grid_visible + offset;
  xd->mi[0] = cm->mi + offset;

  set_plane_n4(xd, bw, bh);

  set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw, cm->mi_rows, cm->mi_cols);

  av1_setup_dst_planes(xd->plane, get_frame_new_buffer(cm), mi_row, mi_col);
}

static void set_param_topblock(AV1_COMMON *const cm, MACROBLOCKD *const xd,
                               BLOCK_SIZE bsize, int mi_row, int mi_col,
                               int txfm, int skip) {
  const int bw = mi_size_wide[bsize];
  const int bh = mi_size_high[bsize];
  const int x_mis = AOMMIN(bw, cm->mi_cols - mi_col);
  const int y_mis = AOMMIN(bh, cm->mi_rows - mi_row);
  const int offset = mi_row * cm->mi_stride + mi_col;
  int x, y;

  xd->mi = cm->mi_grid_visible + offset;
  xd->mi[0] = cm->mi + offset;

  for (y = 0; y < y_mis; ++y)
    for (x = 0; x < x_mis; ++x) {
      xd->mi[y * cm->mi_stride + x]->mbmi.skip = skip;
      xd->mi[y * cm->mi_stride + x]->mbmi.tx_type = txfm;
    }
#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);
  set_txfm_ctxs(xd->mi[0]->mbmi.tx_size, bw, bh, skip, xd);
#endif
}

static void set_ref(AV1_COMMON *const cm, MACROBLOCKD *const xd, int idx,
                    int mi_row, int mi_col) {
  MB_MODE_INFO *const mbmi = &xd->mi[0]->mbmi;
  RefBuffer *ref_buffer = &cm->frame_refs[mbmi->ref_frame[idx] - LAST_FRAME];
  xd->block_refs[idx] = ref_buffer;
  if (!av1_is_valid_scale(&ref_buffer->sf))
    aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                       "Invalid scale factors");
  av1_setup_pre_planes(xd, idx, ref_buffer->buf, mi_row, mi_col,
                       &ref_buffer->sf);
  xd->corrupted |= ref_buffer->buf->corrupted;
}

static void dec_predict_b_extend(
    AV1Decoder *const pbi, MACROBLOCKD *const xd, const TileInfo *const tile,
    int block, int mi_row_ori, int mi_col_ori, int mi_row_pred, int mi_col_pred,
    int mi_row_top, int mi_col_top, uint8_t *dst_buf[3], int dst_stride[3],
    BLOCK_SIZE bsize_top, BLOCK_SIZE bsize_pred, int b_sub8x8, int bextend) {
  // Used in supertx
  // (mi_row_ori, mi_col_ori): location for mv
  // (mi_row_pred, mi_col_pred, bsize_pred): region to predict
  // (mi_row_top, mi_col_top, bsize_top): region of the top partition size
  // block: sub location of sub8x8 blocks
  // b_sub8x8: 1: ori is sub8x8; 0: ori is not sub8x8
  // bextend: 1: region to predict is an extension of ori; 0: not
  int r = (mi_row_pred - mi_row_top) * MI_SIZE;
  int c = (mi_col_pred - mi_col_top) * MI_SIZE;
  const int mi_width_top = mi_size_wide[bsize_top];
  const int mi_height_top = mi_size_high[bsize_top];
  MB_MODE_INFO *mbmi;
  AV1_COMMON *const cm = &pbi->common;

  if (mi_row_pred < mi_row_top || mi_col_pred < mi_col_top ||
      mi_row_pred >= mi_row_top + mi_height_top ||
      mi_col_pred >= mi_col_top + mi_width_top || mi_row_pred >= cm->mi_rows ||
      mi_col_pred >= cm->mi_cols)
    return;

  mbmi = set_offsets_extend(cm, xd, tile, bsize_pred, mi_row_pred, mi_col_pred,
                            mi_row_ori, mi_col_ori);
  set_ref(cm, xd, 0, mi_row_pred, mi_col_pred);
  if (has_second_ref(&xd->mi[0]->mbmi))
    set_ref(cm, xd, 1, mi_row_pred, mi_col_pred);

  if (!bextend) mbmi->tx_size = max_txsize_lookup[bsize_top];

  xd->plane[0].dst.stride = dst_stride[0];
  xd->plane[1].dst.stride = dst_stride[1];
  xd->plane[2].dst.stride = dst_stride[2];
  xd->plane[0].dst.buf = dst_buf[0] +
                         (r >> xd->plane[0].subsampling_y) * dst_stride[0] +
                         (c >> xd->plane[0].subsampling_x);
  xd->plane[1].dst.buf = dst_buf[1] +
                         (r >> xd->plane[1].subsampling_y) * dst_stride[1] +
                         (c >> xd->plane[1].subsampling_x);
  xd->plane[2].dst.buf = dst_buf[2] +
                         (r >> xd->plane[2].subsampling_y) * dst_stride[2] +
                         (c >> xd->plane[2].subsampling_x);

  if (!b_sub8x8)
    av1_build_inter_predictors_sb_extend(xd,
#if CONFIG_EXT_INTER
                                         mi_row_ori, mi_col_ori,
#endif  // CONFIG_EXT_INTER
                                         mi_row_pred, mi_col_pred, bsize_pred);
  else
    av1_build_inter_predictors_sb_sub8x8_extend(xd,
#if CONFIG_EXT_INTER
                                                mi_row_ori, mi_col_ori,
#endif  // CONFIG_EXT_INTER
                                                mi_row_pred, mi_col_pred,
                                                bsize_pred, block);
}

static void dec_extend_dir(AV1Decoder *const pbi, MACROBLOCKD *const xd,
                           const TileInfo *const tile, int block,
                           BLOCK_SIZE bsize, BLOCK_SIZE top_bsize, int mi_row,
                           int mi_col, int mi_row_top, int mi_col_top,
                           uint8_t *dst_buf[3], int dst_stride[3], int dir) {
  // dir: 0-lower, 1-upper, 2-left, 3-right
  //      4-lowerleft, 5-upperleft, 6-lowerright, 7-upperright
  const int mi_width = mi_size_wide[bsize];
  const int mi_height = mi_size_high[bsize];
  int xss = xd->plane[1].subsampling_x;
  int yss = xd->plane[1].subsampling_y;
#if CONFIG_CB4X4
  const int unify_bsize = 1;
#else
  const int unify_bsize = 0;
#endif
  int b_sub8x8 = (bsize < BLOCK_8X8) && !unify_bsize ? 1 : 0;
  BLOCK_SIZE extend_bsize;
  int mi_row_pred, mi_col_pred;

  int wide_unit, high_unit;
  int i, j;
  int ext_offset = 0;

  if (dir == 0 || dir == 1) {
    extend_bsize =
        (mi_width == mi_size_wide[BLOCK_8X8] || bsize < BLOCK_8X8 || xss < yss)
            ? BLOCK_8X8
            : BLOCK_16X8;
#if CONFIG_CB4X4
    if (bsize < BLOCK_8X8) {
      extend_bsize = BLOCK_4X4;
      ext_offset = mi_size_wide[BLOCK_8X8];
    }
#endif

    wide_unit = mi_size_wide[extend_bsize];
    high_unit = mi_size_high[extend_bsize];

    mi_row_pred = mi_row + ((dir == 0) ? mi_height : -(mi_height + ext_offset));
    mi_col_pred = mi_col;

    for (j = 0; j < mi_height + ext_offset; j += high_unit)
      for (i = 0; i < mi_width + ext_offset; i += wide_unit)
        dec_predict_b_extend(pbi, xd, tile, block, mi_row, mi_col,
                             mi_row_pred + j, mi_col_pred + i, mi_row_top,
                             mi_col_top, dst_buf, dst_stride, top_bsize,
                             extend_bsize, b_sub8x8, 1);
  } else if (dir == 2 || dir == 3) {
    extend_bsize =
        (mi_height == mi_size_high[BLOCK_8X8] || bsize < BLOCK_8X8 || yss < xss)
            ? BLOCK_8X8
            : BLOCK_8X16;
#if CONFIG_CB4X4
    if (bsize < BLOCK_8X8) {
      extend_bsize = BLOCK_4X4;
      ext_offset = mi_size_wide[BLOCK_8X8];
    }
#endif

    wide_unit = mi_size_wide[extend_bsize];
    high_unit = mi_size_high[extend_bsize];

    mi_row_pred = mi_row;
    mi_col_pred = mi_col + ((dir == 3) ? mi_width : -(mi_width + ext_offset));

    for (j = 0; j < mi_height + ext_offset; j += high_unit)
      for (i = 0; i < mi_width + ext_offset; i += wide_unit)
        dec_predict_b_extend(pbi, xd, tile, block, mi_row, mi_col,
                             mi_row_pred + j, mi_col_pred + i, mi_row_top,
                             mi_col_top, dst_buf, dst_stride, top_bsize,
                             extend_bsize, b_sub8x8, 1);
  } else {
    extend_bsize = BLOCK_8X8;
#if CONFIG_CB4X4
    if (bsize < BLOCK_8X8) {
      extend_bsize = BLOCK_4X4;
      ext_offset = mi_size_wide[BLOCK_8X8];
    }
#endif
    wide_unit = mi_size_wide[extend_bsize];
    high_unit = mi_size_high[extend_bsize];

    mi_row_pred = mi_row + ((dir == 4 || dir == 6) ? mi_height
                                                   : -(mi_height + ext_offset));
    mi_col_pred =
        mi_col + ((dir == 6 || dir == 7) ? mi_width : -(mi_width + ext_offset));

    for (j = 0; j < mi_height + ext_offset; j += high_unit)
      for (i = 0; i < mi_width + ext_offset; i += wide_unit)
        dec_predict_b_extend(pbi, xd, tile, block, mi_row, mi_col,
                             mi_row_pred + j, mi_col_pred + i, mi_row_top,
                             mi_col_top, dst_buf, dst_stride, top_bsize,
                             extend_bsize, b_sub8x8, 1);
  }
}

static void dec_extend_all(AV1Decoder *const pbi, MACROBLOCKD *const xd,
                           const TileInfo *const tile, int block,
                           BLOCK_SIZE bsize, BLOCK_SIZE top_bsize, int mi_row,
                           int mi_col, int mi_row_top, int mi_col_top,
                           uint8_t *dst_buf[3], int dst_stride[3]) {
  dec_extend_dir(pbi, xd, tile, block, bsize, top_bsize, mi_row, mi_col,
                 mi_row_top, mi_col_top, dst_buf, dst_stride, 0);
  dec_extend_dir(pbi, xd, tile, block, bsize, top_bsize, mi_row, mi_col,
                 mi_row_top, mi_col_top, dst_buf, dst_stride, 1);
  dec_extend_dir(pbi, xd, tile, block, bsize, top_bsize, mi_row, mi_col,
                 mi_row_top, mi_col_top, dst_buf, dst_stride, 2);
  dec_extend_dir(pbi, xd, tile, block, bsize, top_bsize, mi_row, mi_col,
                 mi_row_top, mi_col_top, dst_buf, dst_stride, 3);
  dec_extend_dir(pbi, xd, tile, block, bsize, top_bsize, mi_row, mi_col,
                 mi_row_top, mi_col_top, dst_buf, dst_stride, 4);
  dec_extend_dir(pbi, xd, tile, block, bsize, top_bsize, mi_row, mi_col,
                 mi_row_top, mi_col_top, dst_buf, dst_stride, 5);
  dec_extend_dir(pbi, xd, tile, block, bsize, top_bsize, mi_row, mi_col,
                 mi_row_top, mi_col_top, dst_buf, dst_stride, 6);
  dec_extend_dir(pbi, xd, tile, block, bsize, top_bsize, mi_row, mi_col,
                 mi_row_top, mi_col_top, dst_buf, dst_stride, 7);
}

static void dec_predict_sb_complex(AV1Decoder *const pbi, MACROBLOCKD *const xd,
                                   const TileInfo *const tile, int mi_row,
                                   int mi_col, int mi_row_top, int mi_col_top,
                                   BLOCK_SIZE bsize, BLOCK_SIZE top_bsize,
                                   uint8_t *dst_buf[3], int dst_stride[3]) {
  const AV1_COMMON *const cm = &pbi->common;
  const int hbs = mi_size_wide[bsize] / 2;
  const PARTITION_TYPE partition = get_partition(cm, mi_row, mi_col, bsize);
  const BLOCK_SIZE subsize = get_subsize(bsize, partition);
#if CONFIG_EXT_PARTITION_TYPES
  const BLOCK_SIZE bsize2 = get_subsize(bsize, PARTITION_SPLIT);
#endif
  int i;
  const int mi_offset = mi_row * cm->mi_stride + mi_col;
  uint8_t *dst_buf1[3], *dst_buf2[3], *dst_buf3[3];
#if CONFIG_CB4X4
  const int unify_bsize = 1;
#else
  const int unify_bsize = 0;
#endif

  DECLARE_ALIGNED(16, uint8_t, tmp_buf1[MAX_MB_PLANE * MAX_TX_SQUARE * 2]);
  DECLARE_ALIGNED(16, uint8_t, tmp_buf2[MAX_MB_PLANE * MAX_TX_SQUARE * 2]);
  DECLARE_ALIGNED(16, uint8_t, tmp_buf3[MAX_MB_PLANE * MAX_TX_SQUARE * 2]);
  int dst_stride1[3] = { MAX_TX_SIZE, MAX_TX_SIZE, MAX_TX_SIZE };
  int dst_stride2[3] = { MAX_TX_SIZE, MAX_TX_SIZE, MAX_TX_SIZE };
  int dst_stride3[3] = { MAX_TX_SIZE, MAX_TX_SIZE, MAX_TX_SIZE };

#if CONFIG_AOM_HIGHBITDEPTH
  if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
    int len = sizeof(uint16_t);
    dst_buf1[0] = CONVERT_TO_BYTEPTR(tmp_buf1);
    dst_buf1[1] = CONVERT_TO_BYTEPTR(tmp_buf1 + MAX_TX_SQUARE * len);
    dst_buf1[2] = CONVERT_TO_BYTEPTR(tmp_buf1 + 2 * MAX_TX_SQUARE * len);
    dst_buf2[0] = CONVERT_TO_BYTEPTR(tmp_buf2);
    dst_buf2[1] = CONVERT_TO_BYTEPTR(tmp_buf2 + MAX_TX_SQUARE * len);
    dst_buf2[2] = CONVERT_TO_BYTEPTR(tmp_buf2 + 2 * MAX_TX_SQUARE * len);
    dst_buf3[0] = CONVERT_TO_BYTEPTR(tmp_buf3);
    dst_buf3[1] = CONVERT_TO_BYTEPTR(tmp_buf3 + MAX_TX_SQUARE * len);
    dst_buf3[2] = CONVERT_TO_BYTEPTR(tmp_buf3 + 2 * MAX_TX_SQUARE * len);
  } else {
#endif
    dst_buf1[0] = tmp_buf1;
    dst_buf1[1] = tmp_buf1 + MAX_TX_SQUARE;
    dst_buf1[2] = tmp_buf1 + 2 * MAX_TX_SQUARE;
    dst_buf2[0] = tmp_buf2;
    dst_buf2[1] = tmp_buf2 + MAX_TX_SQUARE;
    dst_buf2[2] = tmp_buf2 + 2 * MAX_TX_SQUARE;
    dst_buf3[0] = tmp_buf3;
    dst_buf3[1] = tmp_buf3 + MAX_TX_SQUARE;
    dst_buf3[2] = tmp_buf3 + 2 * MAX_TX_SQUARE;
#if CONFIG_AOM_HIGHBITDEPTH
  }
#endif

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

  xd->mi = cm->mi_grid_visible + mi_offset;
  xd->mi[0] = cm->mi + mi_offset;

  for (i = 0; i < MAX_MB_PLANE; i++) {
    xd->plane[i].dst.buf = dst_buf[i];
    xd->plane[i].dst.stride = dst_stride[i];
  }

  switch (partition) {
    case PARTITION_NONE:
      assert(bsize < top_bsize);
      dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                           mi_row_top, mi_col_top, dst_buf, dst_stride,
                           top_bsize, bsize, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize, top_bsize, mi_row, mi_col,
                     mi_row_top, mi_col_top, dst_buf, dst_stride);
      break;
    case PARTITION_HORZ:
      if (bsize == BLOCK_8X8 && !unify_bsize) {
        // For sub8x8, predict in 8x8 unit
        // First half
        dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf, dst_stride,
                             top_bsize, BLOCK_8X8, 1, 0);
        if (bsize < top_bsize)
          dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf, dst_stride);

        // Second half
        dec_predict_b_extend(pbi, xd, tile, 2, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf1, dst_stride1,
                             top_bsize, BLOCK_8X8, 1, 1);
        if (bsize < top_bsize)
          dec_extend_all(pbi, xd, tile, 2, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf1, dst_stride1);

        // weighted average to smooth the boundary
        xd->plane[0].dst.buf = dst_buf[0];
        xd->plane[0].dst.stride = dst_stride[0];
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf[0], dst_stride[0], dst_buf1[0], dst_stride1[0], mi_row,
            mi_col, mi_row_top, mi_col_top, bsize, top_bsize, PARTITION_HORZ,
            0);
      } else {
        // First half
        dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf, dst_stride,
                             top_bsize, subsize, 0, 0);
        if (bsize < top_bsize)
          dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf, dst_stride);
        else
          dec_extend_dir(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf, dst_stride, 0);

        if (mi_row + hbs < cm->mi_rows) {
          // Second half
          dec_predict_b_extend(pbi, xd, tile, 0, mi_row + hbs, mi_col,
                               mi_row + hbs, mi_col, mi_row_top, mi_col_top,
                               dst_buf1, dst_stride1, top_bsize, subsize, 0, 0);
          if (bsize < top_bsize)
            dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row + hbs,
                           mi_col, mi_row_top, mi_col_top, dst_buf1,
                           dst_stride1);
          else
            dec_extend_dir(pbi, xd, tile, 0, subsize, top_bsize, mi_row + hbs,
                           mi_col, mi_row_top, mi_col_top, dst_buf1,
                           dst_stride1, 1);

          // weighted average to smooth the boundary
          for (i = 0; i < MAX_MB_PLANE; i++) {
            xd->plane[i].dst.buf = dst_buf[i];
            xd->plane[i].dst.stride = dst_stride[i];
            av1_build_masked_inter_predictor_complex(
                xd, dst_buf[i], dst_stride[i], dst_buf1[i], dst_stride1[i],
                mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
                PARTITION_HORZ, i);
          }
        }
      }
      break;
    case PARTITION_VERT:
      if (bsize == BLOCK_8X8 && !unify_bsize) {
        // First half
        dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf, dst_stride,
                             top_bsize, BLOCK_8X8, 1, 0);
        if (bsize < top_bsize)
          dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf, dst_stride);

        // Second half
        dec_predict_b_extend(pbi, xd, tile, 1, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf1, dst_stride1,
                             top_bsize, BLOCK_8X8, 1, 1);
        if (bsize < top_bsize)
          dec_extend_all(pbi, xd, tile, 1, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf1, dst_stride1);

        // Smooth
        xd->plane[0].dst.buf = dst_buf[0];
        xd->plane[0].dst.stride = dst_stride[0];
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf[0], dst_stride[0], dst_buf1[0], dst_stride1[0], mi_row,
            mi_col, mi_row_top, mi_col_top, bsize, top_bsize, PARTITION_VERT,
            0);
      } else {
        // First half
        dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf, dst_stride,
                             top_bsize, subsize, 0, 0);
        if (bsize < top_bsize)
          dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf, dst_stride);
        else
          dec_extend_dir(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf, dst_stride, 3);

        // Second half
        if (mi_col + hbs < cm->mi_cols) {
          dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col + hbs, mi_row,
                               mi_col + hbs, mi_row_top, mi_col_top, dst_buf1,
                               dst_stride1, top_bsize, subsize, 0, 0);
          if (bsize < top_bsize)
            dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row,
                           mi_col + hbs, mi_row_top, mi_col_top, dst_buf1,
                           dst_stride1);
          else
            dec_extend_dir(pbi, xd, tile, 0, subsize, top_bsize, mi_row,
                           mi_col + hbs, mi_row_top, mi_col_top, dst_buf1,
                           dst_stride1, 2);

          // Smooth
          for (i = 0; i < MAX_MB_PLANE; i++) {
            xd->plane[i].dst.buf = dst_buf[i];
            xd->plane[i].dst.stride = dst_stride[i];
            av1_build_masked_inter_predictor_complex(
                xd, dst_buf[i], dst_stride[i], dst_buf1[i], dst_stride1[i],
                mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
                PARTITION_VERT, i);
          }
        }
      }
      break;
    case PARTITION_SPLIT:
      if (bsize == BLOCK_8X8 && !unify_bsize) {
        dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf, dst_stride,
                             top_bsize, BLOCK_8X8, 1, 0);
        dec_predict_b_extend(pbi, xd, tile, 1, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf1, dst_stride1,
                             top_bsize, BLOCK_8X8, 1, 1);
        dec_predict_b_extend(pbi, xd, tile, 2, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf2, dst_stride2,
                             top_bsize, BLOCK_8X8, 1, 1);
        dec_predict_b_extend(pbi, xd, tile, 3, mi_row, mi_col, mi_row, mi_col,
                             mi_row_top, mi_col_top, dst_buf3, dst_stride3,
                             top_bsize, BLOCK_8X8, 1, 1);
        if (bsize < top_bsize) {
          dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf, dst_stride);
          dec_extend_all(pbi, xd, tile, 1, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf1, dst_stride1);
          dec_extend_all(pbi, xd, tile, 2, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf2, dst_stride2);
          dec_extend_all(pbi, xd, tile, 3, subsize, top_bsize, mi_row, mi_col,
                         mi_row_top, mi_col_top, dst_buf3, dst_stride3);
        }
      } else {
        dec_predict_sb_complex(pbi, xd, tile, mi_row, mi_col, mi_row_top,
                               mi_col_top, subsize, top_bsize, dst_buf,
                               dst_stride);
        if (mi_row < cm->mi_rows && mi_col + hbs < cm->mi_cols)
          dec_predict_sb_complex(pbi, xd, tile, mi_row, mi_col + hbs,
                                 mi_row_top, mi_col_top, subsize, top_bsize,
                                 dst_buf1, dst_stride1);
        if (mi_row + hbs < cm->mi_rows && mi_col < cm->mi_cols)
          dec_predict_sb_complex(pbi, xd, tile, mi_row + hbs, mi_col,
                                 mi_row_top, mi_col_top, subsize, top_bsize,
                                 dst_buf2, dst_stride2);
        if (mi_row + hbs < cm->mi_rows && mi_col + hbs < cm->mi_cols)
          dec_predict_sb_complex(pbi, xd, tile, mi_row + hbs, mi_col + hbs,
                                 mi_row_top, mi_col_top, subsize, top_bsize,
                                 dst_buf3, dst_stride3);
      }
      for (i = 0; i < MAX_MB_PLANE; i++) {
#if !CONFIG_CB4X4
        if (bsize == BLOCK_8X8 && i != 0)
          continue;  // Skip <4x4 chroma smoothing
#endif
        if (mi_row < cm->mi_rows && mi_col + hbs < cm->mi_cols) {
          av1_build_masked_inter_predictor_complex(
              xd, dst_buf[i], dst_stride[i], dst_buf1[i], dst_stride1[i],
              mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
              PARTITION_VERT, i);
          if (mi_row + hbs < cm->mi_rows) {
            av1_build_masked_inter_predictor_complex(
                xd, dst_buf2[i], dst_stride2[i], dst_buf3[i], dst_stride3[i],
                mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
                PARTITION_VERT, i);
            av1_build_masked_inter_predictor_complex(
                xd, dst_buf[i], dst_stride[i], dst_buf2[i], dst_stride2[i],
                mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
                PARTITION_HORZ, i);
          }
        } else if (mi_row + hbs < cm->mi_rows && mi_col < cm->mi_cols) {
          av1_build_masked_inter_predictor_complex(
              xd, dst_buf[i], dst_stride[i], dst_buf2[i], dst_stride2[i],
              mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
              PARTITION_HORZ, i);
        }
      }
      break;
#if CONFIG_EXT_PARTITION_TYPES
    case PARTITION_HORZ_A:
      dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                           mi_row_top, mi_col_top, dst_buf, dst_stride,
                           top_bsize, bsize2, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize2, top_bsize, mi_row, mi_col,
                     mi_row_top, mi_col_top, dst_buf, dst_stride);

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col + hbs, mi_row,
                           mi_col + hbs, mi_row_top, mi_col_top, dst_buf1,
                           dst_stride1, top_bsize, bsize2, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize2, top_bsize, mi_row, mi_col + hbs,
                     mi_row_top, mi_col_top, dst_buf1, dst_stride1);

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row + hbs, mi_col, mi_row + hbs,
                           mi_col, mi_row_top, mi_col_top, dst_buf2,
                           dst_stride2, top_bsize, subsize, 0, 0);
      if (bsize < top_bsize)
        dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row + hbs,
                       mi_col, mi_row_top, mi_col_top, dst_buf2, dst_stride2);
      else
        dec_extend_dir(pbi, xd, tile, 0, subsize, top_bsize, mi_row + hbs,
                       mi_col, mi_row_top, mi_col_top, dst_buf2, dst_stride2,
                       1);

      for (i = 0; i < MAX_MB_PLANE; i++) {
        xd->plane[i].dst.buf = dst_buf[i];
        xd->plane[i].dst.stride = dst_stride[i];
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf[i], dst_stride[i], dst_buf1[i], dst_stride1[i], mi_row,
            mi_col, mi_row_top, mi_col_top, bsize, top_bsize, PARTITION_VERT,
            i);
      }
      for (i = 0; i < MAX_MB_PLANE; i++) {
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf[i], dst_stride[i], dst_buf2[i], dst_stride2[i], mi_row,
            mi_col, mi_row_top, mi_col_top, bsize, top_bsize, PARTITION_HORZ,
            i);
      }
      break;
    case PARTITION_VERT_A:

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                           mi_row_top, mi_col_top, dst_buf, dst_stride,
                           top_bsize, bsize2, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize2, top_bsize, mi_row, mi_col,
                     mi_row_top, mi_col_top, dst_buf, dst_stride);

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row + hbs, mi_col, mi_row + hbs,
                           mi_col, mi_row_top, mi_col_top, dst_buf1,
                           dst_stride1, top_bsize, bsize2, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize2, top_bsize, mi_row + hbs, mi_col,
                     mi_row_top, mi_col_top, dst_buf1, dst_stride1);

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col + hbs, mi_row,
                           mi_col + hbs, mi_row_top, mi_col_top, dst_buf2,
                           dst_stride2, top_bsize, subsize, 0, 0);
      if (bsize < top_bsize)
        dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row,
                       mi_col + hbs, mi_row_top, mi_col_top, dst_buf2,
                       dst_stride2);
      else
        dec_extend_dir(pbi, xd, tile, 0, subsize, top_bsize, mi_row,
                       mi_col + hbs, mi_row_top, mi_col_top, dst_buf2,
                       dst_stride2, 2);

      for (i = 0; i < MAX_MB_PLANE; i++) {
        xd->plane[i].dst.buf = dst_buf[i];
        xd->plane[i].dst.stride = dst_stride[i];
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf[i], dst_stride[i], dst_buf1[i], dst_stride1[i], mi_row,
            mi_col, mi_row_top, mi_col_top, bsize, top_bsize, PARTITION_HORZ,
            i);
      }
      for (i = 0; i < MAX_MB_PLANE; i++) {
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf[i], dst_stride[i], dst_buf2[i], dst_stride2[i], mi_row,
            mi_col, mi_row_top, mi_col_top, bsize, top_bsize, PARTITION_VERT,
            i);
      }
      break;
    case PARTITION_HORZ_B:
      dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                           mi_row_top, mi_col_top, dst_buf, dst_stride,
                           top_bsize, subsize, 0, 0);
      if (bsize < top_bsize)
        dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                       mi_row_top, mi_col_top, dst_buf, dst_stride);
      else
        dec_extend_dir(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                       mi_row_top, mi_col_top, dst_buf, dst_stride, 0);

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row + hbs, mi_col, mi_row + hbs,
                           mi_col, mi_row_top, mi_col_top, dst_buf1,
                           dst_stride1, top_bsize, bsize2, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize2, top_bsize, mi_row + hbs, mi_col,
                     mi_row_top, mi_col_top, dst_buf1, dst_stride1);

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row + hbs, mi_col + hbs,
                           mi_row + hbs, mi_col + hbs, mi_row_top, mi_col_top,
                           dst_buf2, dst_stride2, top_bsize, bsize2, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize2, top_bsize, mi_row + hbs,
                     mi_col + hbs, mi_row_top, mi_col_top, dst_buf2,
                     dst_stride2);

      for (i = 0; i < MAX_MB_PLANE; i++) {
        xd->plane[i].dst.buf = dst_buf1[i];
        xd->plane[i].dst.stride = dst_stride1[i];
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf1[i], dst_stride1[i], dst_buf2[i], dst_stride2[i],
            mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
            PARTITION_VERT, i);
      }
      for (i = 0; i < MAX_MB_PLANE; i++) {
        xd->plane[i].dst.buf = dst_buf[i];
        xd->plane[i].dst.stride = dst_stride[i];
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf[i], dst_stride[i], dst_buf1[i], dst_stride1[i], mi_row,
            mi_col, mi_row_top, mi_col_top, bsize, top_bsize, PARTITION_HORZ,
            i);
      }
      break;
    case PARTITION_VERT_B:
      dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col, mi_row, mi_col,
                           mi_row_top, mi_col_top, dst_buf, dst_stride,
                           top_bsize, subsize, 0, 0);
      if (bsize < top_bsize)
        dec_extend_all(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                       mi_row_top, mi_col_top, dst_buf, dst_stride);
      else
        dec_extend_dir(pbi, xd, tile, 0, subsize, top_bsize, mi_row, mi_col,
                       mi_row_top, mi_col_top, dst_buf, dst_stride, 3);

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row, mi_col + hbs, mi_row,
                           mi_col + hbs, mi_row_top, mi_col_top, dst_buf1,
                           dst_stride1, top_bsize, bsize2, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize2, top_bsize, mi_row, mi_col + hbs,
                     mi_row_top, mi_col_top, dst_buf1, dst_stride1);

      dec_predict_b_extend(pbi, xd, tile, 0, mi_row + hbs, mi_col + hbs,
                           mi_row + hbs, mi_col + hbs, mi_row_top, mi_col_top,
                           dst_buf2, dst_stride2, top_bsize, bsize2, 0, 0);
      dec_extend_all(pbi, xd, tile, 0, bsize2, top_bsize, mi_row + hbs,
                     mi_col + hbs, mi_row_top, mi_col_top, dst_buf2,
                     dst_stride2);

      for (i = 0; i < MAX_MB_PLANE; i++) {
        xd->plane[i].dst.buf = dst_buf1[i];
        xd->plane[i].dst.stride = dst_stride1[i];
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf1[i], dst_stride1[i], dst_buf2[i], dst_stride2[i],
            mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
            PARTITION_HORZ, i);
      }
      for (i = 0; i < MAX_MB_PLANE; i++) {
        xd->plane[i].dst.buf = dst_buf[i];
        xd->plane[i].dst.stride = dst_stride[i];
        av1_build_masked_inter_predictor_complex(
            xd, dst_buf[i], dst_stride[i], dst_buf1[i], dst_stride1[i], mi_row,
            mi_col, mi_row_top, mi_col_top, bsize, top_bsize, PARTITION_VERT,
            i);
      }
      break;
#endif  // CONFIG_EXT_PARTITION_TYPES
    default: assert(0);
  }
}

static void set_segment_id_supertx(const AV1_COMMON *const cm, const int mi_row,
                                   const int mi_col, const BLOCK_SIZE bsize) {
  const struct segmentation *seg = &cm->seg;
  const int miw = AOMMIN(mi_size_wide[bsize], cm->mi_cols - mi_col);
  const int mih = AOMMIN(mi_size_high[bsize], cm->mi_rows - mi_row);
  const int mi_offset = mi_row * cm->mi_stride + mi_col;
  MODE_INFO **const mip = cm->mi_grid_visible + mi_offset;
  int r, c;
  int seg_id_supertx = MAX_SEGMENTS;

  if (!seg->enabled) {
    seg_id_supertx = 0;
  } else {
    // Find the minimum segment_id
    for (r = 0; r < mih; r++)
      for (c = 0; c < miw; c++)
        seg_id_supertx =
            AOMMIN(mip[r * cm->mi_stride + c]->mbmi.segment_id, seg_id_supertx);
    assert(0 <= seg_id_supertx && seg_id_supertx < MAX_SEGMENTS);
  }

  // Assign the the segment_id back to segment_id_supertx
  for (r = 0; r < mih; r++)
    for (c = 0; c < miw; c++)
      mip[r * cm->mi_stride + c]->mbmi.segment_id_supertx = seg_id_supertx;
}
#endif  // CONFIG_SUPERTX

static void decode_block(AV1Decoder *const pbi, MACROBLOCKD *const xd,
#if CONFIG_SUPERTX
                         int supertx_enabled,
#endif  // CONFIG_SUPERTX
                         int mi_row, int mi_col, aom_reader *r,
#if CONFIG_EXT_PARTITION_TYPES
                         PARTITION_TYPE partition,
#endif  // CONFIG_EXT_PARTITION_TYPES
                         BLOCK_SIZE bsize) {
  AV1_COMMON *const cm = &pbi->common;
  const int bw = mi_size_wide[bsize];
  const int bh = mi_size_high[bsize];
  const int x_mis = AOMMIN(bw, cm->mi_cols - mi_col);
  const int y_mis = AOMMIN(bh, cm->mi_rows - mi_row);
  MB_MODE_INFO *mbmi;

#if CONFIG_ACCOUNTING
  aom_accounting_set_context(&pbi->accounting, mi_col, mi_row);
#endif
#if CONFIG_SUPERTX
  if (supertx_enabled) {
    mbmi = set_mb_offsets(cm, xd, bsize, mi_row, mi_col, bw, bh, x_mis, y_mis);
  } else {
    mbmi = set_offsets(cm, xd, bsize, mi_row, mi_col, bw, bh, x_mis, y_mis);
  }
#if CONFIG_EXT_PARTITION_TYPES
  xd->mi[0]->mbmi.partition = partition;
#endif
  av1_read_mode_info(pbi, xd, supertx_enabled, mi_row, mi_col, r, x_mis, y_mis);
#else
  mbmi = set_offsets(cm, xd, bsize, mi_row, mi_col, bw, bh, x_mis, y_mis);
#if CONFIG_EXT_PARTITION_TYPES
  xd->mi[0]->mbmi.partition = partition;
#endif
  av1_read_mode_info(pbi, xd, mi_row, mi_col, r, x_mis, y_mis);
#endif  // CONFIG_SUPERTX

  if (bsize >= BLOCK_8X8 && (cm->subsampling_x || cm->subsampling_y)) {
    const BLOCK_SIZE uv_subsize =
        ss_size_lookup[bsize][cm->subsampling_x][cm->subsampling_y];
    if (uv_subsize == BLOCK_INVALID)
      aom_internal_error(xd->error_info, AOM_CODEC_CORRUPT_FRAME,
                         "Invalid block size.");
  }

#if CONFIG_SUPERTX
  mbmi->segment_id_supertx = MAX_SEGMENTS;

  if (supertx_enabled) {
    xd->corrupted |= aom_reader_has_error(r);
    return;
  }
#endif  // CONFIG_SUPERTX

#if CONFIG_DELTA_Q
  if (cm->delta_q_present_flag) {
    int i;
    for (i = 0; i < MAX_SEGMENTS; i++) {
      xd->plane[0].seg_dequant[i][0] =
          av1_dc_quant(xd->current_qindex, cm->y_dc_delta_q, cm->bit_depth);
      xd->plane[0].seg_dequant[i][1] =
          av1_ac_quant(xd->current_qindex, 0, cm->bit_depth);
      xd->plane[1].seg_dequant[i][0] =
          av1_dc_quant(xd->current_qindex, cm->uv_dc_delta_q, cm->bit_depth);
      xd->plane[1].seg_dequant[i][1] =
          av1_ac_quant(xd->current_qindex, cm->uv_ac_delta_q, cm->bit_depth);
      xd->plane[2].seg_dequant[i][0] =
          av1_dc_quant(xd->current_qindex, cm->uv_dc_delta_q, cm->bit_depth);
      xd->plane[2].seg_dequant[i][1] =
          av1_ac_quant(xd->current_qindex, cm->uv_ac_delta_q, cm->bit_depth);
    }
  }
#endif

#if CONFIG_CB4X4
  if (mbmi->skip) reset_skip_context(xd, bsize);
#else
  if (mbmi->skip) reset_skip_context(xd, AOMMAX(BLOCK_8X8, bsize));
#endif

#if CONFIG_COEF_INTERLEAVE
  {
    const struct macroblockd_plane *const pd_y = &xd->plane[0];
    const struct macroblockd_plane *const pd_c = &xd->plane[1];
    const TX_SIZE tx_log2_y = mbmi->tx_size;
    const TX_SIZE tx_log2_c = get_uv_tx_size(mbmi, pd_c);
    const int tx_sz_y = (1 << tx_log2_y);
    const int tx_sz_c = (1 << tx_log2_c);
    const int num_4x4_w_y = pd_y->n4_w;
    const int num_4x4_h_y = pd_y->n4_h;
    const int num_4x4_w_c = pd_c->n4_w;
    const int num_4x4_h_c = pd_c->n4_h;
    const int max_4x4_w_y = get_max_4x4_size(num_4x4_w_y, xd->mb_to_right_edge,
                                             pd_y->subsampling_x);
    const int max_4x4_h_y = get_max_4x4_size(num_4x4_h_y, xd->mb_to_bottom_edge,
                                             pd_y->subsampling_y);
    const int max_4x4_w_c = get_max_4x4_size(num_4x4_w_c, xd->mb_to_right_edge,
                                             pd_c->subsampling_x);
    const int max_4x4_h_c = get_max_4x4_size(num_4x4_h_c, xd->mb_to_bottom_edge,
                                             pd_c->subsampling_y);

    // The max_4x4_w/h may be smaller than tx_sz under some corner cases,
    // i.e. when the SB is splitted by tile boundaries.
    const int tu_num_w_y = (max_4x4_w_y + tx_sz_y - 1) / tx_sz_y;
    const int tu_num_h_y = (max_4x4_h_y + tx_sz_y - 1) / tx_sz_y;
    const int tu_num_w_c = (max_4x4_w_c + tx_sz_c - 1) / tx_sz_c;
    const int tu_num_h_c = (max_4x4_h_c + tx_sz_c - 1) / tx_sz_c;
    const int tu_num_y = tu_num_w_y * tu_num_h_y;
    const int tu_num_c = tu_num_w_c * tu_num_h_c;

    if (!is_inter_block(mbmi)) {
      int tu_idx_c = 0;
      int row_y, col_y, row_c, col_c;
      int plane;

#if CONFIG_PALETTE
      for (plane = 0; plane <= 1; ++plane) {
        if (mbmi->palette_mode_info.palette_size[plane])
          av1_decode_palette_tokens(xd, plane, r);
      }
#endif

      for (row_y = 0; row_y < tu_num_h_y; row_y++) {
        for (col_y = 0; col_y < tu_num_w_y; col_y++) {
          // luma
          predict_and_reconstruct_intra_block(
              cm, xd, r, mbmi, 0, row_y * tx_sz_y, col_y * tx_sz_y, tx_log2_y);
          // chroma
          if (tu_idx_c < tu_num_c) {
            row_c = (tu_idx_c / tu_num_w_c) * tx_sz_c;
            col_c = (tu_idx_c % tu_num_w_c) * tx_sz_c;
            predict_and_reconstruct_intra_block(cm, xd, r, mbmi, 1, row_c,
                                                col_c, tx_log2_c);
            predict_and_reconstruct_intra_block(cm, xd, r, mbmi, 2, row_c,
                                                col_c, tx_log2_c);
            tu_idx_c++;
          }
        }
      }

      // In 422 case, it's possilbe that Chroma has more TUs than Luma
      while (tu_idx_c < tu_num_c) {
        row_c = (tu_idx_c / tu_num_w_c) * tx_sz_c;
        col_c = (tu_idx_c % tu_num_w_c) * tx_sz_c;
        predict_and_reconstruct_intra_block(cm, xd, r, mbmi, 1, row_c, col_c,
                                            tx_log2_c);
        predict_and_reconstruct_intra_block(cm, xd, r, mbmi, 2, row_c, col_c,
                                            tx_log2_c);
        tu_idx_c++;
      }
    } else {
      // Prediction
      av1_build_inter_predictors_sb(xd, mi_row, mi_col, NULL,
                                    AOMMAX(bsize, BLOCK_8X8));

      // Reconstruction
      if (!mbmi->skip) {
        int eobtotal = 0;
        int tu_idx_c = 0;
        int row_y, col_y, row_c, col_c;

        for (row_y = 0; row_y < tu_num_h_y; row_y++) {
          for (col_y = 0; col_y < tu_num_w_y; col_y++) {
            // luma
            eobtotal += reconstruct_inter_block(cm, xd, r, mbmi->segment_id, 0,
                                                row_y * tx_sz_y,
                                                col_y * tx_sz_y, tx_log2_y);
            // chroma
            if (tu_idx_c < tu_num_c) {
              row_c = (tu_idx_c / tu_num_w_c) * tx_sz_c;
              col_c = (tu_idx_c % tu_num_w_c) * tx_sz_c;
              eobtotal += reconstruct_inter_block(cm, xd, r, mbmi->segment_id,
                                                  1, row_c, col_c, tx_log2_c);
              eobtotal += reconstruct_inter_block(cm, xd, r, mbmi->segment_id,
                                                  2, row_c, col_c, tx_log2_c);
              tu_idx_c++;
            }
          }
        }

        // In 422 case, it's possilbe that Chroma has more TUs than Luma
        while (tu_idx_c < tu_num_c) {
          row_c = (tu_idx_c / tu_num_w_c) * tx_sz_c;
          col_c = (tu_idx_c % tu_num_w_c) * tx_sz_c;
          eobtotal += reconstruct_inter_block(cm, xd, r, mbmi->segment_id, 1,
                                              row_c, col_c, tx_log2_c);
          eobtotal += reconstruct_inter_block(cm, xd, r, mbmi->segment_id, 2,
                                              row_c, col_c, tx_log2_c);
          tu_idx_c++;
        }

        if (bsize >= BLOCK_8X8 && eobtotal == 0)
#if CONFIG_MISC_FIXES
          mbmi->has_no_coeffs = 1;
#else
          mbmi->skip = 1;
#endif
      }
    }
  }
#else
  if (!is_inter_block(mbmi)) {
    int plane;
#if CONFIG_PALETTE
    for (plane = 0; plane <= 1; ++plane) {
      if (mbmi->palette_mode_info.palette_size[plane])
        av1_decode_palette_tokens(xd, plane, r);
    }
#endif  // CONFIG_PALETTE
    for (plane = 0; plane < MAX_MB_PLANE; ++plane) {
      const struct macroblockd_plane *const pd = &xd->plane[plane];
      const TX_SIZE tx_size = plane ? get_uv_tx_size(mbmi, pd) : mbmi->tx_size;
      const int stepr = tx_size_high_unit[tx_size];
      const int stepc = tx_size_wide_unit[tx_size];
#if CONFIG_CB4X4
      const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
#else
      const BLOCK_SIZE plane_bsize =
          get_plane_block_size(AOMMAX(BLOCK_8X8, bsize), pd);
#endif
      int row, col;
      const int max_blocks_wide = max_block_wide(xd, plane_bsize, plane);
      const int max_blocks_high = max_block_high(xd, plane_bsize, plane);

      for (row = 0; row < max_blocks_high; row += stepr)
        for (col = 0; col < max_blocks_wide; col += stepc)
          predict_and_reconstruct_intra_block(cm, xd, r, mbmi, plane, row, col,
                                              tx_size);
    }
  } else {
// Prediction
#if CONFIG_WARPED_MOTION
    if (mbmi->motion_mode == WARPED_CAUSAL) {
      int i;
#if CONFIG_AOM_HIGHBITDEPTH
      int use_hbd = xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH;
#endif  // CONFIG_AOM_HIGHBITDEPTH

      for (i = 0; i < 3; ++i) {
        const struct macroblockd_plane *pd = &xd->plane[i];

        av1_warp_plane(&mbmi->wm_params[0],
#if CONFIG_AOM_HIGHBITDEPTH
                       xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH, xd->bd,
#endif  // CONFIG_AOM_HIGHBITDEPTH
                       pd->pre[0].buf0, pd->pre[0].width, pd->pre[0].height,
                       pd->pre[0].stride, pd->dst.buf,
                       ((mi_col * MI_SIZE) >> pd->subsampling_x),
                       ((mi_row * MI_SIZE) >> pd->subsampling_y),
                       xd->n8_w * (MI_SIZE >> pd->subsampling_x),
                       xd->n8_h * (MI_SIZE >> pd->subsampling_y),
                       pd->dst.stride, pd->subsampling_x, pd->subsampling_y, 16,
                       16, 0);
      }
    } else {
#endif  // CONFIG_WARPED_MOTION
#if CONFIG_CB4X4
      av1_build_inter_predictors_sb(xd, mi_row, mi_col, NULL, bsize);
#else
    av1_build_inter_predictors_sb(xd, mi_row, mi_col, NULL,
                                  AOMMAX(bsize, BLOCK_8X8));
#endif
#if CONFIG_WARPED_MOTION
    }
#endif  // CONFIG_WARPED_MOTION
#if CONFIG_MOTION_VAR
    if (mbmi->motion_mode == OBMC_CAUSAL) {
      av1_build_obmc_inter_predictors_sb(cm, xd, mi_row, mi_col);
    }
#endif  // CONFIG_MOTION_VAR

    // Reconstruction
    if (!mbmi->skip) {
      int eobtotal = 0;
      int plane;

      for (plane = 0; plane < MAX_MB_PLANE; ++plane) {
        const struct macroblockd_plane *const pd = &xd->plane[plane];
#if CONFIG_CB4X4
        const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
#else
        const BLOCK_SIZE plane_bsize =
            get_plane_block_size(AOMMAX(BLOCK_8X8, bsize), pd);
#endif
        const int max_blocks_wide = max_block_wide(xd, plane_bsize, plane);
        const int max_blocks_high = max_block_high(xd, plane_bsize, plane);
        int row, col;
#if CONFIG_VAR_TX
        const TX_SIZE max_tx_size = max_txsize_rect_lookup[plane_bsize];
        const int bh_var_tx = tx_size_high_unit[max_tx_size];
        const int bw_var_tx = tx_size_wide_unit[max_tx_size];
        for (row = 0; row < max_blocks_high; row += bh_var_tx)
          for (col = 0; col < max_blocks_wide; col += bw_var_tx)
            decode_reconstruct_tx(cm, xd, r, mbmi, plane, plane_bsize, row, col,
                                  max_tx_size, &eobtotal);
#else
        const TX_SIZE tx_size =
            plane ? get_uv_tx_size(mbmi, pd) : mbmi->tx_size;
        const int stepr = tx_size_high_unit[tx_size];
        const int stepc = tx_size_wide_unit[tx_size];
        for (row = 0; row < max_blocks_high; row += stepr)
          for (col = 0; col < max_blocks_wide; col += stepc)
            eobtotal += reconstruct_inter_block(cm, xd, r, mbmi->segment_id,
                                                plane, row, col, tx_size);
#endif
      }
    }
  }
#endif

  xd->corrupted |= aom_reader_has_error(r);
}

static PARTITION_TYPE read_partition(AV1_COMMON *cm, MACROBLOCKD *xd,
                                     int mi_row, int mi_col, aom_reader *r,
                                     int has_rows, int has_cols,
                                     BLOCK_SIZE bsize) {
  const int ctx = partition_plane_context(xd, mi_row, mi_col, bsize);
  const aom_prob *const probs = cm->fc->partition_prob[ctx];
  FRAME_COUNTS *counts = xd->counts;
  PARTITION_TYPE p;

  if (has_rows && has_cols)
#if CONFIG_EXT_PARTITION_TYPES
    if (bsize <= BLOCK_8X8)
      p = (PARTITION_TYPE)aom_read_tree(r, av1_partition_tree, probs, ACCT_STR);
    else
      p = (PARTITION_TYPE)aom_read_tree(r, av1_ext_partition_tree, probs,
                                        ACCT_STR);
#else
#if CONFIG_EC_MULTISYMBOL
    p = (PARTITION_TYPE)aom_read_symbol(r, cm->fc->partition_cdf[ctx],
                                        PARTITION_TYPES, ACCT_STR);
#else
    p = (PARTITION_TYPE)aom_read_tree(r, av1_partition_tree, probs, ACCT_STR);
#endif
#endif  // CONFIG_EXT_PARTITION_TYPES
  else if (!has_rows && has_cols)
    p = aom_read(r, probs[1], ACCT_STR) ? PARTITION_SPLIT : PARTITION_HORZ;
  else if (has_rows && !has_cols)
    p = aom_read(r, probs[2], ACCT_STR) ? PARTITION_SPLIT : PARTITION_VERT;
  else
    p = PARTITION_SPLIT;

  if (counts) ++counts->partition[ctx][p];

  return p;
}

#if CONFIG_SUPERTX
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;
  }
}
#endif  // CONFIG_SUPERTX
#if CONFIG_CLPF
static int clpf_all_skip(const AV1_COMMON *cm, int mi_col, int mi_row,
                         int size) {
  int r, c;
  int skip = 1;
  const int maxc = AOMMIN(size, cm->mi_cols - mi_col);
  const int maxr = AOMMIN(size, cm->mi_rows - mi_row);
  for (r = 0; r < maxr && skip; r++) {
    for (c = 0; c < maxc && skip; c++) {
      skip &= !!cm->mi_grid_visible[(mi_row + r) * cm->mi_stride + mi_col + c]
                    ->mbmi.skip;
    }
  }
  return skip;
}
#endif

// TODO(slavarnway): eliminate bsize and subsize in future commits
static void decode_partition(AV1Decoder *const pbi, MACROBLOCKD *const xd,
#if CONFIG_SUPERTX
                             int supertx_enabled,
#endif
                             int mi_row, int mi_col, aom_reader *r,
                             BLOCK_SIZE bsize, int n4x4_l2) {
  AV1_COMMON *const cm = &pbi->common;
  const int n8x8_l2 = n4x4_l2 - 1;
  const int num_8x8_wh = mi_size_wide[bsize];
  const int hbs = num_8x8_wh >> 1;
#if CONFIG_CB4X4
  const int unify_bsize = 1;
#else
  const int unify_bsize = 0;
#endif
  PARTITION_TYPE partition;
  BLOCK_SIZE subsize;
#if CONFIG_EXT_PARTITION_TYPES
  BLOCK_SIZE bsize2 = get_subsize(bsize, PARTITION_SPLIT);
#endif
  const int has_rows = (mi_row + hbs) < cm->mi_rows;
  const int has_cols = (mi_col + hbs) < cm->mi_cols;
#if CONFIG_SUPERTX
  const int read_token = !supertx_enabled;
  int skip = 0;
  TX_SIZE supertx_size = max_txsize_lookup[bsize];
  const TileInfo *const tile = &xd->tile;
  int txfm = DCT_DCT;
#endif  // CONFIG_SUPERTX

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

  partition = (n4x4_l2 == 0) ? PARTITION_NONE
                             : read_partition(cm, xd, mi_row, mi_col, r,
                                              has_rows, has_cols, bsize);
  subsize = subsize_lookup[partition][bsize];  // get_subsize(bsize, partition);

#if CONFIG_PVQ
  assert(partition < PARTITION_TYPES);
  assert(subsize < BLOCK_SIZES);
#endif
#if CONFIG_SUPERTX
  if (!frame_is_intra_only(cm) && partition != PARTITION_NONE &&
      bsize <= MAX_SUPERTX_BLOCK_SIZE && !supertx_enabled && !xd->lossless[0]) {
    const int supertx_context = partition_supertx_context_lookup[partition];
    supertx_enabled = aom_read(
        r, cm->fc->supertx_prob[supertx_context][supertx_size], ACCT_STR);
    if (xd->counts)
      xd->counts->supertx[supertx_context][supertx_size][supertx_enabled]++;
#if CONFIG_VAR_TX
    if (supertx_enabled) xd->supertx_size = supertx_size;
#endif
  }
#endif  // CONFIG_SUPERTX
  if (!hbs && !unify_bsize) {
    // calculate bmode block dimensions (log 2)
    xd->bmode_blocks_wl = 1 >> !!(partition & PARTITION_VERT);
    xd->bmode_blocks_hl = 1 >> !!(partition & PARTITION_HORZ);
    decode_block(pbi, xd,
#if CONFIG_SUPERTX
                 supertx_enabled,
#endif  // CONFIG_SUPERTX
                 mi_row, mi_col, r,
#if CONFIG_EXT_PARTITION_TYPES
                 partition,
#endif  // CONFIG_EXT_PARTITION_TYPES
                 subsize);
  } else {
    switch (partition) {
      case PARTITION_NONE:
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif  // CONFIG_SUPERTX
                     mi_row, mi_col, r,
#if CONFIG_EXT_PARTITION_TYPES
                     partition,
#endif  // CONFIG_EXT_PARTITION_TYPES
                     subsize);
        break;
      case PARTITION_HORZ:
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif  // CONFIG_SUPERTX
                     mi_row, mi_col, r,
#if CONFIG_EXT_PARTITION_TYPES
                     partition,
#endif  // CONFIG_EXT_PARTITION_TYPES
                     subsize);
        if (has_rows)
          decode_block(pbi, xd,
#if CONFIG_SUPERTX
                       supertx_enabled,
#endif  // CONFIG_SUPERTX
                       mi_row + hbs, mi_col, r,
#if CONFIG_EXT_PARTITION_TYPES
                       partition,
#endif  // CONFIG_EXT_PARTITION_TYPES
                       subsize);
        break;
      case PARTITION_VERT:
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif  // CONFIG_SUPERTX
                     mi_row, mi_col, r,
#if CONFIG_EXT_PARTITION_TYPES
                     partition,
#endif  // CONFIG_EXT_PARTITION_TYPES
                     subsize);
        if (has_cols)
          decode_block(pbi, xd,
#if CONFIG_SUPERTX
                       supertx_enabled,
#endif  // CONFIG_SUPERTX
                       mi_row, mi_col + hbs, r,
#if CONFIG_EXT_PARTITION_TYPES
                       partition,
#endif  // CONFIG_EXT_PARTITION_TYPES
                       subsize);
        break;
      case PARTITION_SPLIT:
        decode_partition(pbi, xd,
#if CONFIG_SUPERTX
                         supertx_enabled,
#endif  // CONFIG_SUPERTX
                         mi_row, mi_col, r, subsize, n8x8_l2);
        decode_partition(pbi, xd,
#if CONFIG_SUPERTX
                         supertx_enabled,
#endif  // CONFIG_SUPERTX
                         mi_row, mi_col + hbs, r, subsize, n8x8_l2);
        decode_partition(pbi, xd,
#if CONFIG_SUPERTX
                         supertx_enabled,
#endif  // CONFIG_SUPERTX
                         mi_row + hbs, mi_col, r, subsize, n8x8_l2);
        decode_partition(pbi, xd,
#if CONFIG_SUPERTX
                         supertx_enabled,
#endif  // CONFIG_SUPERTX
                         mi_row + hbs, mi_col + hbs, r, subsize, n8x8_l2);
        break;
#if CONFIG_EXT_PARTITION_TYPES
      case PARTITION_HORZ_A:
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row, mi_col, r, partition, bsize2);
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row, mi_col + hbs, r, partition, bsize2);
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row + hbs, mi_col, r, partition, subsize);
        break;
      case PARTITION_HORZ_B:
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row, mi_col, r, partition, subsize);
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row + hbs, mi_col, r, partition, bsize2);
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row + hbs, mi_col + hbs, r, partition, bsize2);
        break;
      case PARTITION_VERT_A:
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row, mi_col, r, partition, bsize2);
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row + hbs, mi_col, r, partition, bsize2);
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row, mi_col + hbs, r, partition, subsize);
        break;
      case PARTITION_VERT_B:
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row, mi_col, r, partition, subsize);
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row, mi_col + hbs, r, partition, bsize2);
        decode_block(pbi, xd,
#if CONFIG_SUPERTX
                     supertx_enabled,
#endif
                     mi_row + hbs, mi_col + hbs, r, partition, bsize2);
        break;
#endif
      default: assert(0 && "Invalid partition type");
    }
  }

#if CONFIG_SUPERTX
  if (supertx_enabled && read_token) {
    uint8_t *dst_buf[3];
    int dst_stride[3], i;
    int offset = mi_row * cm->mi_stride + mi_col;

    set_segment_id_supertx(cm, mi_row, mi_col, bsize);

    xd->mi = cm->mi_grid_visible + offset;
    xd->mi[0] = cm->mi + offset;
    set_mi_row_col(xd, tile, mi_row, mi_size_high[bsize], mi_col,
                   mi_size_wide[bsize], cm->mi_rows, cm->mi_cols);
    set_skip_context(xd, mi_row, mi_col);
    skip = read_skip(cm, xd, xd->mi[0]->mbmi.segment_id_supertx, r);
    if (skip) {
      reset_skip_context(xd, bsize);
    } else {
#if CONFIG_EXT_TX
      if (get_ext_tx_types(supertx_size, bsize, 1) > 1) {
        int eset = get_ext_tx_set(supertx_size, bsize, 1);
        if (eset > 0) {
          txfm = aom_read_tree(r, av1_ext_tx_inter_tree[eset],
                               cm->fc->inter_ext_tx_prob[eset][supertx_size],
                               ACCT_STR);
          if (xd->counts) ++xd->counts->inter_ext_tx[eset][supertx_size][txfm];
        }
      }
#else
      if (supertx_size < TX_32X32) {
        txfm = aom_read_tree(r, av1_ext_tx_tree,
                             cm->fc->inter_ext_tx_prob[supertx_size], ACCT_STR);
        if (xd->counts) ++xd->counts->inter_ext_tx[supertx_size][txfm];
      }
#endif  // CONFIG_EXT_TX
    }

    av1_setup_dst_planes(xd->plane, get_frame_new_buffer(cm), mi_row, mi_col);
    for (i = 0; i < MAX_MB_PLANE; i++) {
      dst_buf[i] = xd->plane[i].dst.buf;
      dst_stride[i] = xd->plane[i].dst.stride;
    }
    dec_predict_sb_complex(pbi, xd, tile, mi_row, mi_col, mi_row, mi_col, bsize,
                           bsize, dst_buf, dst_stride);

    if (!skip) {
      int eobtotal = 0;
      MB_MODE_INFO *mbmi;
      set_offsets_topblock(cm, xd, tile, bsize, mi_row, mi_col);
      mbmi = &xd->mi[0]->mbmi;
      mbmi->tx_type = txfm;
      assert(mbmi->segment_id_supertx != MAX_SEGMENTS);
      for (i = 0; i < MAX_MB_PLANE; ++i) {
        const struct macroblockd_plane *const pd = &xd->plane[i];
        int row, col;
        const TX_SIZE tx_size = i ? get_uv_tx_size(mbmi, pd) : mbmi->tx_size;
        const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
        const int stepr = tx_size_high_unit[tx_size];
        const int stepc = tx_size_wide_unit[tx_size];
        const int max_blocks_wide = max_block_wide(xd, plane_bsize, i);
        const int max_blocks_high = max_block_high(xd, plane_bsize, i);

        for (row = 0; row < max_blocks_high; row += stepr)
          for (col = 0; col < max_blocks_wide; col += stepc)
            eobtotal += reconstruct_inter_block(
                cm, xd, r, mbmi->segment_id_supertx, i, row, col, tx_size);
      }
      if ((unify_bsize || !(subsize < BLOCK_8X8)) && eobtotal == 0) skip = 1;
    }
    set_param_topblock(cm, xd, bsize, mi_row, mi_col, txfm, skip);
  }
#endif  // CONFIG_SUPERTX

#if CONFIG_EXT_PARTITION_TYPES
  if (bsize >= BLOCK_8X8) {
    switch (partition) {
      case PARTITION_SPLIT:
        if (bsize > BLOCK_8X8) break;
      case PARTITION_NONE:
      case PARTITION_HORZ:
      case PARTITION_VERT:
        update_partition_context(xd, mi_row, mi_col, subsize, bsize);
        break;
      case PARTITION_HORZ_A:
        update_partition_context(xd, mi_row, mi_col, bsize2, subsize);
        update_partition_context(xd, mi_row + hbs, mi_col, subsize, subsize);
        break;
      case PARTITION_HORZ_B:
        update_partition_context(xd, mi_row, mi_col, subsize, subsize);
        update_partition_context(xd, mi_row + hbs, mi_col, bsize2, subsize);
        break;
      case PARTITION_VERT_A:
        update_partition_context(xd, mi_row, mi_col, bsize2, subsize);
        update_partition_context(xd, mi_row, mi_col + hbs, subsize, subsize);
        break;
      case PARTITION_VERT_B:
        update_partition_context(xd, mi_row, mi_col, subsize, subsize);
        update_partition_context(xd, mi_row, mi_col + hbs, bsize2, subsize);
        break;
      default: assert(0 && "Invalid partition type");
    }
  }
#else
  // update partition context
  if (bsize >= BLOCK_8X8 &&
      (bsize == BLOCK_8X8 || partition != PARTITION_SPLIT))
    update_partition_context(xd, mi_row, mi_col, subsize, bsize);
#endif  // CONFIG_EXT_PARTITION_TYPES

#if CONFIG_DERING
#if CONFIG_EXT_PARTITION
  if (cm->sb_size == BLOCK_128X128 && bsize == BLOCK_128X128) {
    if (cm->dering_level != 0 && !sb_all_skip(cm, mi_row, mi_col)) {
      cm->mi_grid_visible[mi_row * cm->mi_stride + mi_col]->mbmi.dering_gain =
          aom_read_literal(r, DERING_REFINEMENT_BITS, ACCT_STR);
    } else {
      cm->mi_grid_visible[mi_row * cm->mi_stride + mi_col]->mbmi.dering_gain =
          0;
    }
  } else if (cm->sb_size == BLOCK_64X64 && bsize == BLOCK_64X64) {
#else
  if (bsize == BLOCK_64X64) {
#endif
    if (cm->dering_level != 0 && !sb_all_skip(cm, mi_row, mi_col)) {
      cm->mi_grid_visible[mi_row * cm->mi_stride + mi_col]->mbmi.dering_gain =
          aom_read_literal(r, DERING_REFINEMENT_BITS, ACCT_STR);
    } else {
      cm->mi_grid_visible[mi_row * cm->mi_stride + mi_col]->mbmi.dering_gain =
          0;
    }
  }
#endif

#if CONFIG_CLPF
#if CONFIG_EXT_PARTITION
  if (cm->sb_size == BLOCK_128X128 && bsize == BLOCK_128X128 &&
      cm->clpf_strength_y && cm->clpf_size != CLPF_NOSIZE) {
    const int tl = mi_row * MI_SIZE / MIN_FB_SIZE * cm->clpf_stride +
                   mi_col * MI_SIZE / MIN_FB_SIZE;
    if (cm->clpf_size == CLPF_128X128) {
      cm->clpf_blocks[tl] = aom_read_literal(r, 1, ACCT_STR);
    } else if (cm->clpf_size == CLPF_64X64) {
      const int tr = tl + 2;
      const int bl = tl + 2 * cm->clpf_stride;
      const int br = tr + 2 * cm->clpf_stride;
      const int size = 64 / MI_SIZE;

      // Up to four bits per SB
      if (!clpf_all_skip(cm, mi_col, mi_row, size))
        cm->clpf_blocks[tl] = aom_read_literal(r, 1, ACCT_STR);

      if (mi_col + size < cm->mi_cols &&
          !clpf_all_skip(cm, mi_col + size, mi_row, size))
        cm->clpf_blocks[tr] = aom_read_literal(r, 1, ACCT_STR);

      if (mi_row + size < cm->mi_rows &&
          !clpf_all_skip(cm, mi_col, mi_row + size, size))
        cm->clpf_blocks[bl] = aom_read_literal(r, 1, ACCT_STR);

      if (mi_col + size < cm->mi_cols && mi_row + size < cm->mi_rows &&
          !clpf_all_skip(cm, mi_col + size, mi_row + size, size))
        cm->clpf_blocks[br] = aom_read_literal(r, 1, ACCT_STR);
    } else if (cm->clpf_size == CLPF_32X32) {
      int i, j;
      const int size = 32 / MI_SIZE;
      for (i = 0; i < 4; ++i)
        for (j = 0; j < 4; ++j) {
          const int index = tl + i * cm->clpf_stride + j;
          if (mi_row + i * size < cm->mi_rows &&
              mi_col + j * size < cm->mi_cols &&
              !clpf_all_skip(cm, mi_col + j * size, mi_row + i * size, size))
            cm->clpf_blocks[index] = aom_read_literal(r, 1, ACCT_STR);
        }
    }
  } else if (cm->sb_size == BLOCK_64X64 && bsize == BLOCK_64X64 &&
#else
  if (bsize == BLOCK_64X64 &&
#endif  // CONFIG_EXT_PARTITION
             cm->clpf_strength_y && cm->clpf_size != CLPF_NOSIZE) {
    const int tl = mi_row * MI_SIZE / MIN_FB_SIZE * cm->clpf_stride +
                   mi_col * MI_SIZE / MIN_FB_SIZE;

    if (!((mi_row * MI_SIZE) & 127) && !((mi_col * MI_SIZE) & 127) &&
        cm->clpf_size == CLPF_128X128) {
      cm->clpf_blocks[tl] = aom_read_literal(r, 1, ACCT_STR);
    } else if (cm->clpf_size == CLPF_64X64 &&
               !clpf_all_skip(cm, mi_col, mi_row, 64 / MI_SIZE)) {
      cm->clpf_blocks[tl] = aom_read_literal(r, 1, ACCT_STR);
    } else if (cm->clpf_size == CLPF_32X32) {
      const int tr = tl + 1;
      const int bl = tl + cm->clpf_stride;
      const int br = tr + cm->clpf_stride;
      const int size = 32 / MI_SIZE;

      // Up to four bits per SB
      if (!clpf_all_skip(cm, mi_col, mi_row, size))
        cm->clpf_blocks[tl] = aom_read_literal(r, 1, ACCT_STR);

      if (mi_col + size < cm->mi_cols &&
          !clpf_all_skip(cm, mi_col + size, mi_row, size))
        cm->clpf_blocks[tr] = aom_read_literal(r, 1, ACCT_STR);

      if (mi_row + size < cm->mi_rows &&
          !clpf_all_skip(cm, mi_col, mi_row + size, size))
        cm->clpf_blocks[bl] = aom_read_literal(r, 1, ACCT_STR);

      if (mi_col + size < cm->mi_cols && mi_row + size < cm->mi_rows &&
          !clpf_all_skip(cm, mi_col + size, mi_row + size, size))
        cm->clpf_blocks[br] = aom_read_literal(r, 1, ACCT_STR);
    }
  }
#endif  // CONFIG_CLPF
}

static void setup_bool_decoder(const uint8_t *data, const uint8_t *data_end,
                               const size_t read_size,
                               struct aom_internal_error_info *error_info,
                               aom_reader *r, aom_decrypt_cb decrypt_cb,
                               void *decrypt_state) {
  // Validate the calculated partition length. If the buffer
  // described by the partition can't be fully read, then restrict
  // it to the portion that can be (for EC mode) or throw an error.
  if (!read_is_valid(data, read_size, data_end))
    aom_internal_error(error_info, AOM_CODEC_CORRUPT_FRAME,
                       "Truncated packet or corrupt tile length");

#if CONFIG_ANS && ANS_MAX_SYMBOLS
  r->window_size = ANS_MAX_SYMBOLS;
#endif
  if (aom_reader_init(r, data, read_size, decrypt_cb, decrypt_state))
    aom_internal_error(error_info, AOM_CODEC_MEM_ERROR,
                       "Failed to allocate bool decoder %d", 1);
}

#if !CONFIG_PVQ
static void read_coef_probs_common(av1_coeff_probs_model *coef_probs,
                                   aom_reader *r) {
  int i, j, k, l, m;
#if CONFIG_EC_ADAPT
  const int node_limit = UNCONSTRAINED_NODES - 1;
#else
  const int node_limit = UNCONSTRAINED_NODES;
#endif

  if (aom_read_bit(r, ACCT_STR))
    for (i = 0; i < PLANE_TYPES; ++i)
      for (j = 0; j < REF_TYPES; ++j)
        for (k = 0; k < COEF_BANDS; ++k)
          for (l = 0; l < BAND_COEFF_CONTEXTS(k); ++l)
            for (m = 0; m < node_limit; ++m)
              av1_diff_update_prob(r, &coef_probs[i][j][k][l][m], ACCT_STR);
}

static void read_coef_probs(FRAME_CONTEXT *fc, TX_MODE tx_mode, aom_reader *r) {
  const TX_SIZE max_tx_size = tx_mode_to_biggest_tx_size[tx_mode];
  TX_SIZE tx_size;
  for (tx_size = 0; tx_size <= max_tx_size; ++tx_size)
    read_coef_probs_common(fc->coef_probs[tx_size], r);
}
#endif

static void setup_segmentation(AV1_COMMON *const cm,
                               struct aom_read_bit_buffer *rb) {
  struct segmentation *const seg = &cm->seg;
  int i, j;

  seg->update_map = 0;
  seg->update_data = 0;

  seg->enabled = aom_rb_read_bit(rb);
  if (!seg->enabled) return;

  // Segmentation map update
  if (frame_is_intra_only(cm) || cm->error_resilient_mode) {
    seg->update_map = 1;
  } else {
    seg->update_map = aom_rb_read_bit(rb);
  }
  if (seg->update_map) {
    if (frame_is_intra_only(cm) || cm->error_resilient_mode) {
      seg->temporal_update = 0;
    } else {
      seg->temporal_update = aom_rb_read_bit(rb);
    }
  }

  // Segmentation data update
  seg->update_data = aom_rb_read_bit(rb);
  if (seg->update_data) {
    seg->abs_delta = aom_rb_read_bit(rb);

    av1_clearall_segfeatures(seg);

    for (i = 0; i < MAX_SEGMENTS; i++) {
      for (j = 0; j < SEG_LVL_MAX; j++) {
        int data = 0;
        const int feature_enabled = aom_rb_read_bit(rb);
        if (feature_enabled) {
          av1_enable_segfeature(seg, i, j);
          data = decode_unsigned_max(rb, av1_seg_feature_data_max(j));
          if (av1_is_segfeature_signed(j))
            data = aom_rb_read_bit(rb) ? -data : data;
        }
        av1_set_segdata(seg, i, j, data);
      }
    }
  }
}

#if CONFIG_LOOP_RESTORATION
static void decode_restoration_mode(AV1_COMMON *cm,
                                    struct aom_read_bit_buffer *rb) {
  int p;
  RestorationInfo *rsi = &cm->rst_info[0];
  if (aom_rb_read_bit(rb)) {
    if (aom_rb_read_bit(rb))
      rsi->frame_restoration_type =
          (aom_rb_read_bit(rb) ? RESTORE_DOMAINTXFMRF : RESTORE_SGRPROJ);
    else
      rsi->frame_restoration_type = RESTORE_WIENER;
  } else {
    rsi->frame_restoration_type =
        aom_rb_read_bit(rb) ? RESTORE_SWITCHABLE : RESTORE_NONE;
  }
  for (p = 1; p < MAX_MB_PLANE; ++p) {
    cm->rst_info[p].frame_restoration_type =
        aom_rb_read_bit(rb) ? RESTORE_WIENER : RESTORE_NONE;
  }
}

static void read_wiener_filter(WienerInfo *wiener_info, aom_reader *rb) {
  wiener_info->vfilter[0] = wiener_info->vfilter[WIENER_WIN - 1] =
      aom_read_literal(rb, WIENER_FILT_TAP0_BITS, ACCT_STR) +
      WIENER_FILT_TAP0_MINV;
  wiener_info->vfilter[1] = wiener_info->vfilter[WIENER_WIN - 2] =
      aom_read_literal(rb, WIENER_FILT_TAP1_BITS, ACCT_STR) +
      WIENER_FILT_TAP1_MINV;
  wiener_info->vfilter[2] = wiener_info->vfilter[WIENER_WIN - 3] =
      aom_read_literal(rb, WIENER_FILT_TAP2_BITS, ACCT_STR) +
      WIENER_FILT_TAP2_MINV;
  wiener_info->vfilter[WIENER_HALFWIN] =
      WIENER_FILT_STEP -
      2 * (wiener_info->vfilter[0] + wiener_info->vfilter[1] +
           wiener_info->vfilter[2]);
  wiener_info->hfilter[0] = wiener_info->hfilter[WIENER_WIN - 1] =
      aom_read_literal(rb, WIENER_FILT_TAP0_BITS, ACCT_STR) +
      WIENER_FILT_TAP0_MINV;
  wiener_info->hfilter[1] = wiener_info->hfilter[WIENER_WIN - 2] =
      aom_read_literal(rb, WIENER_FILT_TAP1_BITS, ACCT_STR) +
      WIENER_FILT_TAP1_MINV;
  wiener_info->hfilter[2] = wiener_info->hfilter[WIENER_WIN - 3] =
      aom_read_literal(rb, WIENER_FILT_TAP2_BITS, ACCT_STR) +
      WIENER_FILT_TAP2_MINV;
  wiener_info->hfilter[WIENER_HALFWIN] =
      WIENER_FILT_STEP -
      2 * (wiener_info->hfilter[0] + wiener_info->hfilter[1] +
           wiener_info->hfilter[2]);
}

static void read_sgrproj_filter(SgrprojInfo *sgrproj_info, aom_reader *rb) {
  sgrproj_info->ep = aom_read_literal(rb, SGRPROJ_PARAMS_BITS, ACCT_STR);
  sgrproj_info->xqd[0] =
      aom_read_literal(rb, SGRPROJ_PRJ_BITS, ACCT_STR) + SGRPROJ_PRJ_MIN0;
  sgrproj_info->xqd[1] =
      aom_read_literal(rb, SGRPROJ_PRJ_BITS, ACCT_STR) + SGRPROJ_PRJ_MIN1;
}

static void read_domaintxfmrf_filter(DomaintxfmrfInfo *domaintxfmrf_info,
                                     aom_reader *rb) {
  domaintxfmrf_info->sigma_r =
      aom_read_literal(rb, DOMAINTXFMRF_PARAMS_BITS, ACCT_STR);
}

static void decode_restoration(AV1_COMMON *cm, aom_reader *rb) {
  int i, p;
  const int ntiles =
      av1_get_rest_ntiles(cm->width, cm->height, NULL, NULL, NULL, NULL);
  const int ntiles_uv = av1_get_rest_ntiles(cm->width >> cm->subsampling_x,
                                            cm->height >> cm->subsampling_y,
                                            NULL, NULL, NULL, NULL);
  RestorationInfo *rsi = &cm->rst_info[0];
  if (rsi->frame_restoration_type != RESTORE_NONE) {
    if (rsi->frame_restoration_type == RESTORE_SWITCHABLE) {
      for (i = 0; i < ntiles; ++i) {
        rsi->restoration_type[i] =
            aom_read_tree(rb, av1_switchable_restore_tree,
                          cm->fc->switchable_restore_prob, ACCT_STR);
        if (rsi->restoration_type[i] == RESTORE_WIENER) {
          read_wiener_filter(&rsi->wiener_info[i], rb);
        } else if (rsi->restoration_type[i] == RESTORE_SGRPROJ) {
          read_sgrproj_filter(&rsi->sgrproj_info[i], rb);
        } else if (rsi->restoration_type[i] == RESTORE_DOMAINTXFMRF) {
          read_domaintxfmrf_filter(&rsi->domaintxfmrf_info[i], rb);
        }
      }
    } else if (rsi->frame_restoration_type == RESTORE_WIENER) {
      for (i = 0; i < ntiles; ++i) {
        if (aom_read(rb, RESTORE_NONE_WIENER_PROB, ACCT_STR)) {
          rsi->restoration_type[i] = RESTORE_WIENER;
          read_wiener_filter(&rsi->wiener_info[i], rb);
        } else {
          rsi->restoration_type[i] = RESTORE_NONE;
        }
      }
    } else if (rsi->frame_restoration_type == RESTORE_SGRPROJ) {
      for (i = 0; i < ntiles; ++i) {
        if (aom_read(rb, RESTORE_NONE_SGRPROJ_PROB, ACCT_STR)) {
          rsi->restoration_type[i] = RESTORE_SGRPROJ;
          read_sgrproj_filter(&rsi->sgrproj_info[i], rb);
        } else {
          rsi->restoration_type[i] = RESTORE_NONE;
        }
      }
    } else if (rsi->frame_restoration_type == RESTORE_DOMAINTXFMRF) {
      for (i = 0; i < ntiles; ++i) {
        if (aom_read(rb, RESTORE_NONE_DOMAINTXFMRF_PROB, ACCT_STR)) {
          rsi->restoration_type[i] = RESTORE_DOMAINTXFMRF;
          read_domaintxfmrf_filter(&rsi->domaintxfmrf_info[i], rb);
        } else {
          rsi->restoration_type[i] = RESTORE_NONE;
        }
      }
    }
  }
  for (p = 1; p < MAX_MB_PLANE; ++p) {
    rsi = &cm->rst_info[p];
    if (rsi->frame_restoration_type == RESTORE_WIENER) {
      for (i = 0; i < ntiles_uv; ++i) {
        if (ntiles_uv > 1)
          rsi->restoration_type[i] =
              aom_read(rb, RESTORE_NONE_WIENER_PROB, ACCT_STR) ? RESTORE_WIENER
                                                               : RESTORE_NONE;
        else
          rsi->restoration_type[i] = RESTORE_WIENER;
        if (rsi->restoration_type[i] == RESTORE_WIENER) {
          read_wiener_filter(&rsi->wiener_info[i], rb);
        }
      }
    }
  }
}
#endif  // CONFIG_LOOP_RESTORATION

static void setup_loopfilter(AV1_COMMON *cm, struct aom_read_bit_buffer *rb) {
  struct loopfilter *lf = &cm->lf;
  lf->filter_level = aom_rb_read_literal(rb, 6);
  lf->sharpness_level = aom_rb_read_literal(rb, 3);

  // Read in loop filter deltas applied at the MB level based on mode or ref
  // frame.
  lf->mode_ref_delta_update = 0;

  lf->mode_ref_delta_enabled = aom_rb_read_bit(rb);
  if (lf->mode_ref_delta_enabled) {
    lf->mode_ref_delta_update = aom_rb_read_bit(rb);
    if (lf->mode_ref_delta_update) {
      int i;

      for (i = 0; i < TOTAL_REFS_PER_FRAME; i++)
        if (aom_rb_read_bit(rb))
          lf->ref_deltas[i] = aom_rb_read_inv_signed_literal(rb, 6);

      for (i = 0; i < MAX_MODE_LF_DELTAS; i++)
        if (aom_rb_read_bit(rb))
          lf->mode_deltas[i] = aom_rb_read_inv_signed_literal(rb, 6);
    }
  }
}

#if CONFIG_CLPF
static void setup_clpf(AV1Decoder *pbi, struct aom_read_bit_buffer *rb) {
  AV1_COMMON *const cm = &pbi->common;
  const int width = pbi->cur_buf->buf.y_crop_width;
  const int height = pbi->cur_buf->buf.y_crop_height;

  cm->clpf_blocks = 0;
  cm->clpf_strength_y = aom_rb_read_literal(rb, 2);
  cm->clpf_strength_u = aom_rb_read_literal(rb, 2);
  cm->clpf_strength_v = aom_rb_read_literal(rb, 2);
  if (cm->clpf_strength_y) {
    cm->clpf_size = aom_rb_read_literal(rb, 2);
    if (cm->clpf_size != CLPF_NOSIZE) {
      int size;
      cm->clpf_stride =
          ((width + MIN_FB_SIZE - 1) & ~(MIN_FB_SIZE - 1)) >> MIN_FB_SIZE_LOG2;
      size =
          cm->clpf_stride * ((height + MIN_FB_SIZE - 1) & ~(MIN_FB_SIZE - 1)) >>
          MIN_FB_SIZE_LOG2;
      CHECK_MEM_ERROR(cm, cm->clpf_blocks, aom_malloc(size));
      memset(cm->clpf_blocks, -1, size);
    }
  }
}

static int clpf_bit(UNUSED int k, UNUSED int l,
                    UNUSED const YV12_BUFFER_CONFIG *rec,
                    UNUSED const YV12_BUFFER_CONFIG *org,
                    UNUSED const AV1_COMMON *cm, UNUSED int block_size,
                    UNUSED int w, UNUSED int h, UNUSED unsigned int strength,
                    UNUSED unsigned int fb_size_log2, int8_t *bit) {
  return *bit;
}
#endif

#if CONFIG_DERING
static void setup_dering(AV1_COMMON *cm, struct aom_read_bit_buffer *rb) {
  cm->dering_level = aom_rb_read_literal(rb, DERING_LEVEL_BITS);
}
#endif  // CONFIG_DERING

static INLINE int read_delta_q(struct aom_read_bit_buffer *rb) {
  return aom_rb_read_bit(rb) ? aom_rb_read_inv_signed_literal(rb, 6) : 0;
}

static void setup_quantization(AV1_COMMON *const cm,
                               struct aom_read_bit_buffer *rb) {
  cm->base_qindex = aom_rb_read_literal(rb, QINDEX_BITS);
  cm->y_dc_delta_q = read_delta_q(rb);
  cm->uv_dc_delta_q = read_delta_q(rb);
  cm->uv_ac_delta_q = read_delta_q(rb);
  cm->dequant_bit_depth = cm->bit_depth;
#if CONFIG_AOM_QM
  cm->using_qmatrix = aom_rb_read_bit(rb);
  if (cm->using_qmatrix) {
    cm->min_qmlevel = aom_rb_read_literal(rb, QM_LEVEL_BITS);
    cm->max_qmlevel = aom_rb_read_literal(rb, QM_LEVEL_BITS);
  } else {
    cm->min_qmlevel = 0;
    cm->max_qmlevel = 0;
  }
#endif
}

static void setup_segmentation_dequant(AV1_COMMON *const cm) {
  // Build y/uv dequant values based on segmentation.
  int i = 0;
#if CONFIG_AOM_QM
  int lossless;
  int j = 0;
  int qmlevel;
  int using_qm = cm->using_qmatrix;
  int minqm = cm->min_qmlevel;
  int maxqm = cm->max_qmlevel;
#endif
#if CONFIG_NEW_QUANT
  int b;
  int dq;
#endif  //  CONFIG_NEW_QUANT
  if (cm->seg.enabled) {
    for (i = 0; i < MAX_SEGMENTS; ++i) {
      const int qindex = av1_get_qindex(&cm->seg, i, cm->base_qindex);
      cm->y_dequant[i][0] =
          av1_dc_quant(qindex, cm->y_dc_delta_q, cm->bit_depth);
      cm->y_dequant[i][1] = av1_ac_quant(qindex, 0, cm->bit_depth);
      cm->uv_dequant[i][0] =
          av1_dc_quant(qindex, cm->uv_dc_delta_q, cm->bit_depth);
      cm->uv_dequant[i][1] =
          av1_ac_quant(qindex, cm->uv_ac_delta_q, cm->bit_depth);
#if CONFIG_AOM_QM
      lossless = qindex == 0 && cm->y_dc_delta_q == 0 &&
                 cm->uv_dc_delta_q == 0 && cm->uv_ac_delta_q == 0;
      // NB: depends on base index so there is only 1 set per frame
      // No quant weighting when lossless or signalled not using QM
      qmlevel = (lossless || using_qm == 0)
                    ? NUM_QM_LEVELS - 1
                    : aom_get_qmlevel(cm->base_qindex, minqm, maxqm);
      for (j = 0; j < TX_SIZES; ++j) {
        cm->y_iqmatrix[i][1][j] = aom_iqmatrix(cm, qmlevel, 0, j, 1);
        cm->y_iqmatrix[i][0][j] = aom_iqmatrix(cm, qmlevel, 0, j, 0);
        cm->uv_iqmatrix[i][1][j] = aom_iqmatrix(cm, qmlevel, 1, j, 1);
        cm->uv_iqmatrix[i][0][j] = aom_iqmatrix(cm, qmlevel, 1, j, 0);
      }
#endif  // CONFIG_AOM_QM
#if CONFIG_NEW_QUANT
      for (dq = 0; dq < QUANT_PROFILES; dq++) {
        for (b = 0; b < COEF_BANDS; ++b) {
          av1_get_dequant_val_nuq(cm->y_dequant[i][b != 0], b,
                                  cm->y_dequant_nuq[i][dq][b], NULL, dq);
          av1_get_dequant_val_nuq(cm->uv_dequant[i][b != 0], b,
                                  cm->uv_dequant_nuq[i][dq][b], NULL, dq);
        }
      }
#endif  //  CONFIG_NEW_QUANT
    }
  } else {
    const int qindex = cm->base_qindex;
    // When segmentation is disabled, only the first value is used.  The
    // remaining are don't cares.
    cm->y_dequant[0][0] = av1_dc_quant(qindex, cm->y_dc_delta_q, cm->bit_depth);
    cm->y_dequant[0][1] = av1_ac_quant(qindex, 0, cm->bit_depth);
    cm->uv_dequant[0][0] =
        av1_dc_quant(qindex, cm->uv_dc_delta_q, cm->bit_depth);
    cm->uv_dequant[0][1] =
        av1_ac_quant(qindex, cm->uv_ac_delta_q, cm->bit_depth);
#if CONFIG_AOM_QM
    lossless = qindex == 0 && cm->y_dc_delta_q == 0 && cm->uv_dc_delta_q == 0 &&
               cm->uv_ac_delta_q == 0;
    // No quant weighting when lossless or signalled not using QM
    qmlevel = (lossless || using_qm == 0)
                  ? NUM_QM_LEVELS - 1
                  : aom_get_qmlevel(cm->base_qindex, minqm, maxqm);
    for (j = 0; j < TX_SIZES; ++j) {
      cm->y_iqmatrix[i][1][j] = aom_iqmatrix(cm, qmlevel, 0, j, 1);
      cm->y_iqmatrix[i][0][j] = aom_iqmatrix(cm, qmlevel, 0, j, 0);
      cm->uv_iqmatrix[i][1][j] = aom_iqmatrix(cm, qmlevel, 1, j, 1);
      cm->uv_iqmatrix[i][0][j] = aom_iqmatrix(cm, qmlevel, 1, j, 0);
    }
#endif
#if CONFIG_NEW_QUANT
    for (dq = 0; dq < QUANT_PROFILES; dq++) {
      for (b = 0; b < COEF_BANDS; ++b) {
        av1_get_dequant_val_nuq(cm->y_dequant[0][b != 0], b,
                                cm->y_dequant_nuq[0][dq][b], NULL, dq);
        av1_get_dequant_val_nuq(cm->uv_dequant[0][b != 0], b,
                                cm->uv_dequant_nuq[0][dq][b], NULL, dq);
      }
    }
#endif  //  CONFIG_NEW_QUANT
  }
}

static InterpFilter read_frame_interp_filter(struct aom_read_bit_buffer *rb) {
  return aom_rb_read_bit(rb) ? SWITCHABLE
                             : aom_rb_read_literal(rb, LOG_SWITCHABLE_FILTERS);
}

static void setup_render_size(AV1_COMMON *cm, struct aom_read_bit_buffer *rb) {
  cm->render_width = cm->width;
  cm->render_height = cm->height;
  if (aom_rb_read_bit(rb))
    av1_read_frame_size(rb, &cm->render_width, &cm->render_height);
}

static void resize_mv_buffer(AV1_COMMON *cm) {
  aom_free(cm->cur_frame->mvs);
  cm->cur_frame->mi_rows = cm->mi_rows;
  cm->cur_frame->mi_cols = cm->mi_cols;
  CHECK_MEM_ERROR(cm, cm->cur_frame->mvs,
                  (MV_REF *)aom_calloc(cm->mi_rows * cm->mi_cols,
                                       sizeof(*cm->cur_frame->mvs)));
}

static void resize_context_buffers(AV1_COMMON *cm, int width, int height) {
#if CONFIG_SIZE_LIMIT
  if (width > DECODE_WIDTH_LIMIT || height > DECODE_HEIGHT_LIMIT)
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Dimensions of %dx%d beyond allowed size of %dx%d.",
                       width, height, DECODE_WIDTH_LIMIT, DECODE_HEIGHT_LIMIT);
#endif
  if (cm->width != width || cm->height != height) {
    const int new_mi_rows =
        ALIGN_POWER_OF_TWO(height, MI_SIZE_LOG2) >> MI_SIZE_LOG2;
    const int new_mi_cols =
        ALIGN_POWER_OF_TWO(width, MI_SIZE_LOG2) >> MI_SIZE_LOG2;

    // Allocations in av1_alloc_context_buffers() depend on individual
    // dimensions as well as the overall size.
    if (new_mi_cols > cm->mi_cols || new_mi_rows > cm->mi_rows) {
      if (av1_alloc_context_buffers(cm, width, height))
        aom_internal_error(&cm->error, AOM_CODEC_MEM_ERROR,
                           "Failed to allocate context buffers");
    } else {
      av1_set_mb_mi(cm, width, height);
    }
    av1_init_context_buffers(cm);
    cm->width = width;
    cm->height = height;
  }
  if (cm->cur_frame->mvs == NULL || cm->mi_rows > cm->cur_frame->mi_rows ||
      cm->mi_cols > cm->cur_frame->mi_cols) {
    resize_mv_buffer(cm);
  }
}

static void setup_frame_size(AV1_COMMON *cm, struct aom_read_bit_buffer *rb) {
  int width, height;
  BufferPool *const pool = cm->buffer_pool;
  av1_read_frame_size(rb, &width, &height);
  resize_context_buffers(cm, width, height);
  setup_render_size(cm, rb);

  lock_buffer_pool(pool);
  if (aom_realloc_frame_buffer(
          get_frame_new_buffer(cm), cm->width, cm->height, cm->subsampling_x,
          cm->subsampling_y,
#if CONFIG_AOM_HIGHBITDEPTH
          cm->use_highbitdepth,
#endif
          AOM_BORDER_IN_PIXELS, cm->byte_alignment,
          &pool->frame_bufs[cm->new_fb_idx].raw_frame_buffer, pool->get_fb_cb,
          pool->cb_priv)) {
    unlock_buffer_pool(pool);
    aom_internal_error(&cm->error, AOM_CODEC_MEM_ERROR,
                       "Failed to allocate frame buffer");
  }
  unlock_buffer_pool(pool);

  pool->frame_bufs[cm->new_fb_idx].buf.subsampling_x = cm->subsampling_x;
  pool->frame_bufs[cm->new_fb_idx].buf.subsampling_y = cm->subsampling_y;
  pool->frame_bufs[cm->new_fb_idx].buf.bit_depth = (unsigned int)cm->bit_depth;
  pool->frame_bufs[cm->new_fb_idx].buf.color_space = cm->color_space;
  pool->frame_bufs[cm->new_fb_idx].buf.color_range = cm->color_range;
  pool->frame_bufs[cm->new_fb_idx].buf.render_width = cm->render_width;
  pool->frame_bufs[cm->new_fb_idx].buf.render_height = cm->render_height;
}

static INLINE int valid_ref_frame_img_fmt(aom_bit_depth_t ref_bit_depth,
                                          int ref_xss, int ref_yss,
                                          aom_bit_depth_t this_bit_depth,
                                          int this_xss, int this_yss) {
  return ref_bit_depth == this_bit_depth && ref_xss == this_xss &&
         ref_yss == this_yss;
}

static void setup_frame_size_with_refs(AV1_COMMON *cm,
                                       struct aom_read_bit_buffer *rb) {
  int width, height;
  int found = 0, i;
  int has_valid_ref_frame = 0;
  BufferPool *const pool = cm->buffer_pool;
  for (i = 0; i < INTER_REFS_PER_FRAME; ++i) {
    if (aom_rb_read_bit(rb)) {
      YV12_BUFFER_CONFIG *const buf = cm->frame_refs[i].buf;
      width = buf->y_crop_width;
      height = buf->y_crop_height;
      cm->render_width = buf->render_width;
      cm->render_height = buf->render_height;
      found = 1;
      break;
    }
  }

  if (!found) {
    av1_read_frame_size(rb, &width, &height);
    setup_render_size(cm, rb);
  }

  if (width <= 0 || height <= 0)
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Invalid frame size");

  // Check to make sure at least one of frames that this frame references
  // has valid dimensions.
  for (i = 0; i < INTER_REFS_PER_FRAME; ++i) {
    RefBuffer *const ref_frame = &cm->frame_refs[i];
    has_valid_ref_frame |=
        valid_ref_frame_size(ref_frame->buf->y_crop_width,
                             ref_frame->buf->y_crop_height, width, height);
  }
  if (!has_valid_ref_frame)
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Referenced frame has invalid size");
  for (i = 0; i < INTER_REFS_PER_FRAME; ++i) {
    RefBuffer *const ref_frame = &cm->frame_refs[i];
    if (!valid_ref_frame_img_fmt(ref_frame->buf->bit_depth,
                                 ref_frame->buf->subsampling_x,
                                 ref_frame->buf->subsampling_y, cm->bit_depth,
                                 cm->subsampling_x, cm->subsampling_y))
      aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                         "Referenced frame has incompatible color format");
  }

  resize_context_buffers(cm, width, height);

  lock_buffer_pool(pool);
  if (aom_realloc_frame_buffer(
          get_frame_new_buffer(cm), cm->width, cm->height, cm->subsampling_x,
          cm->subsampling_y,
#if CONFIG_AOM_HIGHBITDEPTH
          cm->use_highbitdepth,
#endif
          AOM_BORDER_IN_PIXELS, cm->byte_alignment,
          &pool->frame_bufs[cm->new_fb_idx].raw_frame_buffer, pool->get_fb_cb,
          pool->cb_priv)) {
    unlock_buffer_pool(pool);
    aom_internal_error(&cm->error, AOM_CODEC_MEM_ERROR,
                       "Failed to allocate frame buffer");
  }
  unlock_buffer_pool(pool);

  pool->frame_bufs[cm->new_fb_idx].buf.subsampling_x = cm->subsampling_x;
  pool->frame_bufs[cm->new_fb_idx].buf.subsampling_y = cm->subsampling_y;
  pool->frame_bufs[cm->new_fb_idx].buf.bit_depth = (unsigned int)cm->bit_depth;
  pool->frame_bufs[cm->new_fb_idx].buf.color_space = cm->color_space;
  pool->frame_bufs[cm->new_fb_idx].buf.color_range = cm->color_range;
  pool->frame_bufs[cm->new_fb_idx].buf.render_width = cm->render_width;
  pool->frame_bufs[cm->new_fb_idx].buf.render_height = cm->render_height;
}

static void read_tile_info(AV1Decoder *const pbi,
                           struct aom_read_bit_buffer *const rb) {
  AV1_COMMON *const cm = &pbi->common;
#if CONFIG_EXT_TILE
// Read the tile width/height
#if CONFIG_EXT_PARTITION
  if (cm->sb_size == BLOCK_128X128) {
    cm->tile_width = aom_rb_read_literal(rb, 5) + 1;
    cm->tile_height = aom_rb_read_literal(rb, 5) + 1;
  } else
#endif  // CONFIG_EXT_PARTITION
  {
    cm->tile_width = aom_rb_read_literal(rb, 6) + 1;
    cm->tile_height = aom_rb_read_literal(rb, 6) + 1;
  }

#if CONFIG_DEBLOCKING_ACROSS_TILES
  cm->loop_filter_across_tiles_enabled = aom_rb_read_bit(rb);
#endif  // CONFIG_DEBLOCKING_ACROSS_TILES

  cm->tile_width <<= cm->mib_size_log2;
  cm->tile_height <<= cm->mib_size_log2;

  cm->tile_width = AOMMIN(cm->tile_width, cm->mi_cols);
  cm->tile_height = AOMMIN(cm->tile_height, cm->mi_rows);

  // Get the number of tiles
  cm->tile_cols = 1;
  while (cm->tile_cols * cm->tile_width < cm->mi_cols) ++cm->tile_cols;

  cm->tile_rows = 1;
  while (cm->tile_rows * cm->tile_height < cm->mi_rows) ++cm->tile_rows;

  if (cm->tile_cols * cm->tile_rows > 1) {
    // Read the number of bytes used to store tile size
    pbi->tile_col_size_bytes = aom_rb_read_literal(rb, 2) + 1;
    pbi->tile_size_bytes = aom_rb_read_literal(rb, 2) + 1;
  }
#else
  int min_log2_tile_cols, max_log2_tile_cols, max_ones;
  av1_get_tile_n_bits(cm->mi_cols, &min_log2_tile_cols, &max_log2_tile_cols);

  // columns
  max_ones = max_log2_tile_cols - min_log2_tile_cols;
  cm->log2_tile_cols = min_log2_tile_cols;
  while (max_ones-- && aom_rb_read_bit(rb)) cm->log2_tile_cols++;

  if (cm->log2_tile_cols > 6)
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Invalid number of tile columns");

  // rows
  cm->log2_tile_rows = aom_rb_read_bit(rb);
  if (cm->log2_tile_rows) cm->log2_tile_rows += aom_rb_read_bit(rb);

#if CONFIG_DEBLOCKING_ACROSS_TILES
  cm->loop_filter_across_tiles_enabled = aom_rb_read_bit(rb);
#endif  // CONFIG_DEBLOCKING_ACROSS_TILES

  cm->tile_cols = 1 << cm->log2_tile_cols;
  cm->tile_rows = 1 << cm->log2_tile_rows;

  cm->tile_width = ALIGN_POWER_OF_TWO(cm->mi_cols, MAX_MIB_SIZE_LOG2);
  cm->tile_width >>= cm->log2_tile_cols;
  cm->tile_height = ALIGN_POWER_OF_TWO(cm->mi_rows, MAX_MIB_SIZE_LOG2);
  cm->tile_height >>= cm->log2_tile_rows;

  // round to integer multiples of superblock size
  cm->tile_width = ALIGN_POWER_OF_TWO(cm->tile_width, MAX_MIB_SIZE_LOG2);
  cm->tile_height = ALIGN_POWER_OF_TWO(cm->tile_height, MAX_MIB_SIZE_LOG2);

// tile size magnitude
#if !CONFIG_TILE_GROUPS
  if (cm->tile_rows > 1 || cm->tile_cols > 1)
#endif
    pbi->tile_size_bytes = aom_rb_read_literal(rb, 2) + 1;
#endif  // CONFIG_EXT_TILE

#if CONFIG_TILE_GROUPS
  // Store an index to the location of the tile group information
  pbi->tg_size_bit_offset = rb->bit_offset;
  pbi->tg_size = 1 << (cm->log2_tile_rows + cm->log2_tile_cols);
  if (cm->log2_tile_rows + cm->log2_tile_cols > 0) {
    pbi->tg_start =
        aom_rb_read_literal(rb, cm->log2_tile_rows + cm->log2_tile_cols);
    pbi->tg_size =
        1 + aom_rb_read_literal(rb, cm->log2_tile_rows + cm->log2_tile_cols);
  }
#endif
}

static int mem_get_varsize(const uint8_t *src, const int sz) {
  switch (sz) {
    case 1: return src[0];
    case 2: return mem_get_le16(src);
    case 3: return mem_get_le24(src);
    case 4: return mem_get_le32(src);
    default: assert("Invalid size" && 0); return -1;
  }
}

#if CONFIG_EXT_TILE
// Reads the next tile returning its size and adjusting '*data' accordingly
// based on 'is_last'.
static void get_tile_buffer(const uint8_t *const data_end,
                            struct aom_internal_error_info *error_info,
                            const uint8_t **data, aom_decrypt_cb decrypt_cb,
                            void *decrypt_state,
                            TileBufferDec (*const tile_buffers)[MAX_TILE_COLS],
                            int tile_size_bytes, int col, int row) {
  size_t size;

  size_t copy_size = 0;
  const uint8_t *copy_data = NULL;

  if (!read_is_valid(*data, tile_size_bytes, data_end))
    aom_internal_error(error_info, AOM_CODEC_CORRUPT_FRAME,
                       "Truncated packet or corrupt tile length");
  if (decrypt_cb) {
    uint8_t be_data[4];
    decrypt_cb(decrypt_state, *data, be_data, tile_size_bytes);

    // Only read number of bytes in cm->tile_size_bytes.
    size = mem_get_varsize(be_data, tile_size_bytes);
  } else {
    size = mem_get_varsize(*data, tile_size_bytes);
  }

  // The top bit indicates copy mode
  if ((size >> (tile_size_bytes * 8 - 1)) == 1) {
    // The remaining bits in the top byte signal the row offset
    int offset = (size >> (tile_size_bytes - 1) * 8) & 0x7f;

    // Currently, only use tiles in same column as reference tiles.
    copy_data = tile_buffers[row - offset][col].data;
    copy_size = tile_buffers[row - offset][col].size;
    size = 0;
  }

  *data += tile_size_bytes;

  if (size > (size_t)(data_end - *data))
    aom_internal_error(error_info, AOM_CODEC_CORRUPT_FRAME,
                       "Truncated packet or corrupt tile size");

  if (size > 0) {
    tile_buffers[row][col].data = *data;
    tile_buffers[row][col].size = size;
  } else {
    tile_buffers[row][col].data = copy_data;
    tile_buffers[row][col].size = copy_size;
  }

  *data += size;

  tile_buffers[row][col].raw_data_end = *data;
}

static void get_tile_buffers(
    AV1Decoder *pbi, const uint8_t *data, const uint8_t *data_end,
    TileBufferDec (*const tile_buffers)[MAX_TILE_COLS]) {
  AV1_COMMON *const cm = &pbi->common;
  const int tile_cols = cm->tile_cols;
  const int tile_rows = cm->tile_rows;
  const int have_tiles = tile_cols * tile_rows > 1;

  if (!have_tiles) {
    const uint32_t tile_size = data_end - data;
    tile_buffers[0][0].data = data;
    tile_buffers[0][0].size = tile_size;
    tile_buffers[0][0].raw_data_end = NULL;
  } else {
    // We locate only the tile buffers that are required, which are the ones
    // specified by pbi->dec_tile_col and pbi->dec_tile_row. Also, we always
    // need the last (bottom right) tile buffer, as we need to know where the
    // end of the compressed frame buffer is for proper superframe decoding.

    const uint8_t *tile_col_data_end[MAX_TILE_COLS];
    const uint8_t *const data_start = data;

    const int dec_tile_row = AOMMIN(pbi->dec_tile_row, tile_rows);
    const int single_row = pbi->dec_tile_row >= 0;
    const int tile_rows_start = single_row ? dec_tile_row : 0;
    const int tile_rows_end = single_row ? tile_rows_start + 1 : tile_rows;
    const int dec_tile_col = AOMMIN(pbi->dec_tile_col, tile_cols);
    const int single_col = pbi->dec_tile_col >= 0;
    const int tile_cols_start = single_col ? dec_tile_col : 0;
    const int tile_cols_end = single_col ? tile_cols_start + 1 : tile_cols;

    const int tile_col_size_bytes = pbi->tile_col_size_bytes;
    const int tile_size_bytes = pbi->tile_size_bytes;

    size_t tile_col_size;
    int r, c;

    // Read tile column sizes for all columns (we need the last tile buffer)
    for (c = 0; c < tile_cols; ++c) {
      const int is_last = c == tile_cols - 1;
      if (!is_last) {
        tile_col_size = mem_get_varsize(data, tile_col_size_bytes);
        data += tile_col_size_bytes;
        tile_col_data_end[c] = data + tile_col_size;
      } else {
        tile_col_size = data_end - data;
        tile_col_data_end[c] = data_end;
      }
      data += tile_col_size;
    }

    data = data_start;

    // Read the required tile sizes.
    for (c = tile_cols_start; c < tile_cols_end; ++c) {
      const int is_last = c == tile_cols - 1;

      if (c > 0) data = tile_col_data_end[c - 1];

      if (!is_last) data += tile_col_size_bytes;

      // Get the whole of the last column, otherwise stop at the required tile.
      for (r = 0; r < (is_last ? tile_rows : tile_rows_end); ++r) {
        tile_buffers[r][c].col = c;

        get_tile_buffer(tile_col_data_end[c], &pbi->common.error, &data,
                        pbi->decrypt_cb, pbi->decrypt_state, tile_buffers,
                        tile_size_bytes, c, r);
      }
    }

    // If we have not read the last column, then read it to get the last tile.
    if (tile_cols_end != tile_cols) {
      c = tile_cols - 1;

      data = tile_col_data_end[c - 1];

      for (r = 0; r < tile_rows; ++r) {
        tile_buffers[r][c].col = c;

        get_tile_buffer(tile_col_data_end[c], &pbi->common.error, &data,
                        pbi->decrypt_cb, pbi->decrypt_state, tile_buffers,
                        tile_size_bytes, c, r);
      }
    }
  }
}
#else
// Reads the next tile returning its size and adjusting '*data' accordingly
// based on 'is_last'.
static void get_tile_buffer(const uint8_t *const data_end,
                            const int tile_size_bytes, int is_last,
                            struct aom_internal_error_info *error_info,
                            const uint8_t **data, aom_decrypt_cb decrypt_cb,
                            void *decrypt_state, TileBufferDec *const buf) {
  size_t size;

  if (!is_last) {
    if (!read_is_valid(*data, 4, data_end))
      aom_internal_error(error_info, AOM_CODEC_CORRUPT_FRAME,
                         "Truncated packet or corrupt tile length");

    if (decrypt_cb) {
      uint8_t be_data[4];
      decrypt_cb(decrypt_state, *data, be_data, tile_size_bytes);
      size = mem_get_varsize(be_data, tile_size_bytes);
    } else {
      size = mem_get_varsize(*data, tile_size_bytes);
    }
    *data += tile_size_bytes;

    if (size > (size_t)(data_end - *data))
      aom_internal_error(error_info, AOM_CODEC_CORRUPT_FRAME,
                         "Truncated packet or corrupt tile size");
  } else {
    size = data_end - *data;
  }

  buf->data = *data;
  buf->size = size;

  *data += size;
}

static void get_tile_buffers(
    AV1Decoder *pbi, const uint8_t *data, const uint8_t *data_end,
    TileBufferDec (*const tile_buffers)[MAX_TILE_COLS]) {
  AV1_COMMON *const cm = &pbi->common;
#if CONFIG_TILE_GROUPS
  int r, c;
  const int tile_cols = cm->tile_cols;
  const int tile_rows = cm->tile_rows;
  int tc = 0;
  int first_tile_in_tg = 0;
  int hdr_offset;
  struct aom_read_bit_buffer rb_tg_hdr;
  uint8_t clear_data[MAX_AV1_HEADER_SIZE];
  const int num_tiles = tile_rows * tile_cols;
  const int num_bits = OD_ILOG(num_tiles) - 1;
  const int hdr_size = pbi->uncomp_hdr_size + pbi->first_partition_size;
  const int tg_size_bit_offset = pbi->tg_size_bit_offset;

  for (r = 0; r < tile_rows; ++r) {
    for (c = 0; c < tile_cols; ++c, ++tc) {
      TileBufferDec *const buf = &tile_buffers[r][c];
      hdr_offset = (tc && tc == first_tile_in_tg) ? hdr_size : 0;

      buf->col = c;
      if (hdr_offset) {
        init_read_bit_buffer(pbi, &rb_tg_hdr, data, data_end, clear_data);
        rb_tg_hdr.bit_offset = tg_size_bit_offset;
        if (num_tiles) {
          pbi->tg_start = aom_rb_read_literal(&rb_tg_hdr, num_bits);
          pbi->tg_size = 1 + aom_rb_read_literal(&rb_tg_hdr, num_bits);
        }
      }
      first_tile_in_tg += tc == first_tile_in_tg ? pbi->tg_size : 0;
      data += hdr_offset;
      get_tile_buffer(data_end, pbi->tile_size_bytes, 0, &pbi->common.error,
                      &data, pbi->decrypt_cb, pbi->decrypt_state, buf);
    }
  }
#else
  int r, c;
  const int tile_cols = cm->tile_cols;
  const int tile_rows = cm->tile_rows;

  for (r = 0; r < tile_rows; ++r) {
    for (c = 0; c < tile_cols; ++c) {
      const int is_last = (r == tile_rows - 1) && (c == tile_cols - 1);
      TileBufferDec *const buf = &tile_buffers[r][c];
      buf->col = c;
      get_tile_buffer(data_end, pbi->tile_size_bytes, is_last, &cm->error,
                      &data, pbi->decrypt_cb, pbi->decrypt_state, buf);
    }
  }
#endif
}
#endif  // CONFIG_EXT_TILE

#if CONFIG_PVQ
static void daala_dec_init(AV1_COMMON *const cm, daala_dec_ctx *daala_dec,
                           aom_reader *r) {
  daala_dec->r = r;
  od_adapt_ctx_reset(&daala_dec->state.adapt, 0);

  // TODO(yushin) : activity masking info needs be signaled by a bitstream
  daala_dec->use_activity_masking = AV1_PVQ_ENABLE_ACTIVITY_MASKING;

  if (daala_dec->use_activity_masking)
    daala_dec->qm = OD_HVS_QM;
  else
    daala_dec->qm = OD_FLAT_QM;

  od_init_qm(daala_dec->state.qm, daala_dec->state.qm_inv,
             daala_dec->qm == OD_HVS_QM ? OD_QM8_Q4_HVS : OD_QM8_Q4_FLAT);

  if (daala_dec->use_activity_masking) {
    int pli;
    int use_masking = daala_dec->use_activity_masking;
    int segment_id = 0;
    int qindex = av1_get_qindex(&cm->seg, segment_id, cm->base_qindex);

    for (pli = 0; pli < MAX_MB_PLANE; pli++) {
      int i;
      int q;

      q = qindex;
      if (q <= OD_DEFAULT_QMS[use_masking][0][pli].interp_q << OD_COEFF_SHIFT) {
        od_interp_qm(&daala_dec->state.pvq_qm_q4[pli][0], q,
                     &OD_DEFAULT_QMS[use_masking][0][pli], NULL);
      } else {
        i = 0;
        while (OD_DEFAULT_QMS[use_masking][i + 1][pli].qm_q4 != NULL &&
               q > OD_DEFAULT_QMS[use_masking][i + 1][pli].interp_q
                       << OD_COEFF_SHIFT) {
          i++;
        }
        od_interp_qm(&daala_dec->state.pvq_qm_q4[pli][0], q,
                     &OD_DEFAULT_QMS[use_masking][i][pli],
                     &OD_DEFAULT_QMS[use_masking][i + 1][pli]);
      }
    }
  }
}
#endif  // #if CONFIG_PVQ

static const uint8_t *decode_tiles(AV1Decoder *pbi, const uint8_t *data,
                                   const uint8_t *data_end) {
  AV1_COMMON *const cm = &pbi->common;
  const AVxWorkerInterface *const winterface = aom_get_worker_interface();
  const int tile_cols = cm->tile_cols;
  const int tile_rows = cm->tile_rows;
  const int n_tiles = tile_cols * tile_rows;
  TileBufferDec(*const tile_buffers)[MAX_TILE_COLS] = pbi->tile_buffers;
#if CONFIG_EXT_TILE
  const int dec_tile_row = AOMMIN(pbi->dec_tile_row, tile_rows);
  const int single_row = pbi->dec_tile_row >= 0;
  const int tile_rows_start = single_row ? dec_tile_row : 0;
  const int tile_rows_end = single_row ? dec_tile_row + 1 : tile_rows;
  const int dec_tile_col = AOMMIN(pbi->dec_tile_col, tile_cols);
  const int single_col = pbi->dec_tile_col >= 0;
  const int tile_cols_start = single_col ? dec_tile_col : 0;
  const int tile_cols_end = single_col ? tile_cols_start + 1 : tile_cols;
  const int inv_col_order = pbi->inv_tile_order && !single_col;
  const int inv_row_order = pbi->inv_tile_order && !single_row;
#else
  const int tile_rows_start = 0;
  const int tile_rows_end = tile_rows;
  const int tile_cols_start = 0;
  const int tile_cols_end = tile_cols;
  const int inv_col_order = pbi->inv_tile_order;
  const int inv_row_order = pbi->inv_tile_order;
#endif  // CONFIG_EXT_TILE
  int tile_row, tile_col;

#if CONFIG_ENTROPY
  cm->do_subframe_update = n_tiles == 1;
#endif  // CONFIG_ENTROPY

  if (cm->lf.filter_level && !cm->skip_loop_filter &&
      pbi->lf_worker.data1 == NULL) {
    CHECK_MEM_ERROR(cm, pbi->lf_worker.data1,
                    aom_memalign(32, sizeof(LFWorkerData)));
    pbi->lf_worker.hook = (AVxWorkerHook)av1_loop_filter_worker;
    if (pbi->max_threads > 1 && !winterface->reset(&pbi->lf_worker)) {
      aom_internal_error(&cm->error, AOM_CODEC_ERROR,
                         "Loop filter thread creation failed");
    }
  }

  if (cm->lf.filter_level && !cm->skip_loop_filter) {
    LFWorkerData *const lf_data = (LFWorkerData *)pbi->lf_worker.data1;
    // Be sure to sync as we might be resuming after a failed frame decode.
    winterface->sync(&pbi->lf_worker);
    av1_loop_filter_data_reset(lf_data, get_frame_new_buffer(cm), cm,
                               pbi->mb.plane);
  }

  assert(tile_rows <= MAX_TILE_ROWS);
  assert(tile_cols <= MAX_TILE_COLS);

  get_tile_buffers(pbi, data, data_end, tile_buffers);

  if (pbi->tile_data == NULL || n_tiles != pbi->allocated_tiles) {
    aom_free(pbi->tile_data);
    CHECK_MEM_ERROR(cm, pbi->tile_data,
                    aom_memalign(32, n_tiles * (sizeof(*pbi->tile_data))));
    pbi->allocated_tiles = n_tiles;
  }
#if CONFIG_ACCOUNTING
  if (pbi->acct_enabled) {
    aom_accounting_reset(&pbi->accounting);
  }
#endif
  // Load all tile information into tile_data.
  for (tile_row = tile_rows_start; tile_row < tile_rows_end; ++tile_row) {
    for (tile_col = tile_cols_start; tile_col < tile_cols_end; ++tile_col) {
      const TileBufferDec *const buf = &tile_buffers[tile_row][tile_col];
      TileData *const td = pbi->tile_data + tile_cols * tile_row + tile_col;

      td->cm = cm;
      td->xd = pbi->mb;
      td->xd.corrupted = 0;
      td->xd.counts =
          cm->refresh_frame_context == REFRESH_FRAME_CONTEXT_BACKWARD
              ? &cm->counts
              : NULL;
      av1_zero(td->dqcoeff);
#if CONFIG_PVQ
      av1_zero(td->pvq_ref_coeff);
#endif
      av1_tile_init(&td->xd.tile, td->cm, tile_row, tile_col);
      setup_bool_decoder(buf->data, data_end, buf->size, &cm->error,
                         &td->bit_reader, pbi->decrypt_cb, pbi->decrypt_state);
#if CONFIG_ACCOUNTING
      if (pbi->acct_enabled) {
        td->bit_reader.accounting = &pbi->accounting;
      } else {
        td->bit_reader.accounting = NULL;
      }
#endif
      av1_init_macroblockd(cm, &td->xd,
#if CONFIG_PVQ
                           td->pvq_ref_coeff,
#endif
                           td->dqcoeff);
#if CONFIG_PVQ
      daala_dec_init(cm, &td->xd.daala_dec, &td->bit_reader);
#endif
#if CONFIG_PALETTE
      td->xd.plane[0].color_index_map = td->color_index_map[0];
      td->xd.plane[1].color_index_map = td->color_index_map[1];
#endif  // CONFIG_PALETTE
    }
  }

  for (tile_row = tile_rows_start; tile_row < tile_rows_end; ++tile_row) {
    const int row = inv_row_order ? tile_rows - 1 - tile_row : tile_row;
    int mi_row = 0;
    TileInfo tile_info;

    av1_tile_set_row(&tile_info, cm, row);

    for (tile_col = tile_cols_start; tile_col < tile_cols_end; ++tile_col) {
      const int col = inv_col_order ? tile_cols - 1 - tile_col : tile_col;
      TileData *const td = pbi->tile_data + tile_cols * row + col;
#if CONFIG_ACCOUNTING
      if (pbi->acct_enabled) {
        td->bit_reader.accounting->last_tell_frac =
            aom_reader_tell_frac(&td->bit_reader);
      }
#endif

      av1_tile_set_col(&tile_info, cm, col);

      av1_zero_above_context(cm, tile_info.mi_col_start, tile_info.mi_col_end);

      for (mi_row = tile_info.mi_row_start; mi_row < tile_info.mi_row_end;
           mi_row += cm->mib_size) {
        int mi_col;

        av1_zero_left_context(&td->xd);

        for (mi_col = tile_info.mi_col_start; mi_col < tile_info.mi_col_end;
             mi_col += cm->mib_size) {
#if CONFIG_DEBLOCKING_ACROSS_TILES
          if (av1_disable_loopfilter_on_tile_boundary(cm)) {
            av1_update_tile_boundary_info(cm, &tile_info, mi_row, mi_col);
          }
#endif  // CONFIG_DEBLOCKING_ACROSS_TILES

          decode_partition(pbi, &td->xd,
#if CONFIG_SUPERTX
                           0,
#endif  // CONFIG_SUPERTX
                           mi_row, mi_col, &td->bit_reader, cm->sb_size,
                           b_width_log2_lookup[cm->sb_size]);
        }
        pbi->mb.corrupted |= td->xd.corrupted;
        if (pbi->mb.corrupted)
          aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                             "Failed to decode tile data");
#if CONFIG_ENTROPY
        if (cm->do_subframe_update &&
            cm->refresh_frame_context == REFRESH_FRAME_CONTEXT_BACKWARD) {
          if ((mi_row + MI_SIZE) %
                      (MI_SIZE *
                       AOMMAX(cm->mi_rows / MI_SIZE / COEF_PROBS_BUFS, 1)) ==
                  0 &&
              mi_row + MI_SIZE < cm->mi_rows &&
              cm->coef_probs_update_idx < COEF_PROBS_BUFS - 1) {
            av1_partial_adapt_probs(cm, mi_row, mi_col);
            ++cm->coef_probs_update_idx;
          }
        }
#endif  // CONFIG_ENTROPY
      }
    }

    assert(mi_row > 0);

// when Parallel deblocking is enabled, deblocking should not
// be interleaved with decoding. Instead, deblocking should be done
// after the entire frame is decoded.
#if !CONFIG_VAR_TX && !CONFIG_PARALLEL_DEBLOCKING
    // Loopfilter one tile row.
    if (cm->lf.filter_level && !cm->skip_loop_filter) {
      LFWorkerData *const lf_data = (LFWorkerData *)pbi->lf_worker.data1;
      const int lf_start = AOMMAX(0, tile_info.mi_row_start - cm->mib_size);
      const int lf_end = tile_info.mi_row_end - cm->mib_size;

      // Delay the loopfilter if the first tile row is only
      // a single superblock high.
      if (lf_end <= 0) continue;

      // Decoding has completed. Finish up the loop filter in this thread.
      if (tile_info.mi_row_end >= cm->mi_rows) continue;

      winterface->sync(&pbi->lf_worker);
      lf_data->start = lf_start;
      lf_data->stop = lf_end;
      if (pbi->max_threads > 1) {
        winterface->launch(&pbi->lf_worker);
      } else {
        winterface->execute(&pbi->lf_worker);
      }
    }
#endif  // !CONFIG_VAR_TX && !CONFIG_PARALLEL_DEBLOCKING

    // After loopfiltering, the last 7 row pixels in each superblock row may
    // still be changed by the longest loopfilter of the next superblock row.
    if (cm->frame_parallel_decode)
      av1_frameworker_broadcast(pbi->cur_buf, mi_row << cm->mib_size_log2);
  }

#if CONFIG_VAR_TX
  // Loopfilter the whole frame.
  av1_loop_filter_frame(get_frame_new_buffer(cm), cm, &pbi->mb,
                        cm->lf.filter_level, 0, 0);
#else
#if CONFIG_PARALLEL_DEBLOCKING
  // Loopfilter all rows in the frame in the frame.
  if (cm->lf.filter_level && !cm->skip_loop_filter) {
    LFWorkerData *const lf_data = (LFWorkerData *)pbi->lf_worker.data1;
    winterface->sync(&pbi->lf_worker);
    lf_data->start = 0;
    lf_data->stop = cm->mi_rows;
    winterface->execute(&pbi->lf_worker);
  }
#else
  // Loopfilter remaining rows in the frame.
  if (cm->lf.filter_level && !cm->skip_loop_filter) {
    LFWorkerData *const lf_data = (LFWorkerData *)pbi->lf_worker.data1;
    winterface->sync(&pbi->lf_worker);
    lf_data->start = lf_data->stop;
    lf_data->stop = cm->mi_rows;
    winterface->execute(&pbi->lf_worker);
  }
#endif  // CONFIG_PARALLEL_DEBLOCKING
#endif  // CONFIG_VAR_TX
  if (cm->frame_parallel_decode)
    av1_frameworker_broadcast(pbi->cur_buf, INT_MAX);

#if CONFIG_EXT_TILE
  if (n_tiles == 1) {
#if CONFIG_ANS
    return data_end;
#else
    // Find the end of the single tile buffer
    return aom_reader_find_end(&pbi->tile_data->bit_reader);
#endif  // CONFIG_ANS
  } else {
    // Return the end of the last tile buffer
    return tile_buffers[tile_rows - 1][tile_cols - 1].raw_data_end;
  }
#else
#if CONFIG_ANS
  return data_end;
#else
  {
    // Get last tile data.
    TileData *const td = pbi->tile_data + tile_cols * tile_rows - 1;
    return aom_reader_find_end(&td->bit_reader);
  }
#endif  // CONFIG_ANS
#endif  // CONFIG_EXT_TILE
}

static int tile_worker_hook(TileWorkerData *const tile_data,
                            const TileInfo *const tile) {
  AV1Decoder *const pbi = tile_data->pbi;
  const AV1_COMMON *const cm = &pbi->common;
  int mi_row, mi_col;

  if (setjmp(tile_data->error_info.jmp)) {
    tile_data->error_info.setjmp = 0;
    tile_data->xd.corrupted = 1;
    return 0;
  }

  tile_data->error_info.setjmp = 1;
  tile_data->xd.error_info = &tile_data->error_info;

  av1_zero_above_context(&pbi->common, tile->mi_col_start, tile->mi_col_end);

  for (mi_row = tile->mi_row_start; mi_row < tile->mi_row_end;
       mi_row += cm->mib_size) {
    av1_zero_left_context(&tile_data->xd);

    for (mi_col = tile->mi_col_start; mi_col < tile->mi_col_end;
         mi_col += cm->mib_size) {
      decode_partition(pbi, &tile_data->xd,
#if CONFIG_SUPERTX
                       0,
#endif
                       mi_row, mi_col, &tile_data->bit_reader, cm->sb_size,
                       b_width_log2_lookup[cm->sb_size]);
    }
  }
  return !tile_data->xd.corrupted;
}

// sorts in descending order
static int compare_tile_buffers(const void *a, const void *b) {
  const TileBufferDec *const buf1 = (const TileBufferDec *)a;
  const TileBufferDec *const buf2 = (const TileBufferDec *)b;
  return (int)(buf2->size - buf1->size);
}

static const uint8_t *decode_tiles_mt(AV1Decoder *pbi, const uint8_t *data,
                                      const uint8_t *data_end) {
  AV1_COMMON *const cm = &pbi->common;
  const AVxWorkerInterface *const winterface = aom_get_worker_interface();
  const int tile_cols = cm->tile_cols;
  const int tile_rows = cm->tile_rows;
  const int num_workers = AOMMIN(pbi->max_threads & ~1, tile_cols);
  TileBufferDec(*const tile_buffers)[MAX_TILE_COLS] = pbi->tile_buffers;
#if CONFIG_EXT_TILE
  const int dec_tile_row = AOMMIN(pbi->dec_tile_row, tile_rows);
  const int single_row = pbi->dec_tile_row >= 0;
  const int tile_rows_start = single_row ? dec_tile_row : 0;
  const int tile_rows_end = single_row ? dec_tile_row + 1 : tile_rows;
  const int dec_tile_col = AOMMIN(pbi->dec_tile_col, tile_cols);
  const int single_col = pbi->dec_tile_col >= 0;
  const int tile_cols_start = single_col ? dec_tile_col : 0;
  const int tile_cols_end = single_col ? tile_cols_start + 1 : tile_cols;
#else
  const int tile_rows_start = 0;
  const int tile_rows_end = tile_rows;
  const int tile_cols_start = 0;
  const int tile_cols_end = tile_cols;
#endif  // CONFIG_EXT_TILE
  int tile_row, tile_col;
  int i;

#if !(CONFIG_ANS || CONFIG_EXT_TILE)
  int final_worker = -1;
#endif  // !(CONFIG_ANS || CONFIG_EXT_TILE)

  assert(tile_rows <= MAX_TILE_ROWS);
  assert(tile_cols <= MAX_TILE_COLS);

  assert(tile_cols * tile_rows > 1);

  // TODO(jzern): See if we can remove the restriction of passing in max
  // threads to the decoder.
  if (pbi->num_tile_workers == 0) {
    const int num_threads = pbi->max_threads & ~1;
    CHECK_MEM_ERROR(cm, pbi->tile_workers,
                    aom_malloc(num_threads * sizeof(*pbi->tile_workers)));
    // Ensure tile data offsets will be properly aligned. This may fail on
    // platforms without DECLARE_ALIGNED().
    assert((sizeof(*pbi->tile_worker_data) % 16) == 0);
    CHECK_MEM_ERROR(
        cm, pbi->tile_worker_data,
        aom_memalign(32, num_threads * sizeof(*pbi->tile_worker_data)));
    CHECK_MEM_ERROR(cm, pbi->tile_worker_info,
                    aom_malloc(num_threads * sizeof(*pbi->tile_worker_info)));
    for (i = 0; i < num_threads; ++i) {
      AVxWorker *const worker = &pbi->tile_workers[i];
      ++pbi->num_tile_workers;

      winterface->init(worker);
      if (i < num_threads - 1 && !winterface->reset(worker)) {
        aom_internal_error(&cm->error, AOM_CODEC_ERROR,
                           "Tile decoder thread creation failed");
      }
    }
  }

  // Reset tile decoding hook
  for (i = 0; i < num_workers; ++i) {
    AVxWorker *const worker = &pbi->tile_workers[i];
    winterface->sync(worker);
    worker->hook = (AVxWorkerHook)tile_worker_hook;
    worker->data1 = &pbi->tile_worker_data[i];
    worker->data2 = &pbi->tile_worker_info[i];
  }

  // Initialize thread frame counts.
  if (cm->refresh_frame_context == REFRESH_FRAME_CONTEXT_BACKWARD) {
    for (i = 0; i < num_workers; ++i) {
      TileWorkerData *const twd = (TileWorkerData *)pbi->tile_workers[i].data1;
      av1_zero(twd->counts);
    }
  }

  // Load tile data into tile_buffers
  get_tile_buffers(pbi, data, data_end, tile_buffers);

  for (tile_row = tile_rows_start; tile_row < tile_rows_end; ++tile_row) {
    // Sort the buffers in this tile row based on size in descending order.
    qsort(&tile_buffers[tile_row][tile_cols_start],
          tile_cols_end - tile_cols_start, sizeof(tile_buffers[0][0]),
          compare_tile_buffers);

    // Rearrange the tile buffers in this tile row such that per-tile group
    // the largest, and presumably the most difficult tile will be decoded in
    // the main thread. This should help minimize the number of instances
    // where the main thread is waiting for a worker to complete.
    {
      int group_start;
      for (group_start = tile_cols_start; group_start < tile_cols_end;
           group_start += num_workers) {
        const int group_end = AOMMIN(group_start + num_workers, tile_cols);
        const TileBufferDec largest = tile_buffers[tile_row][group_start];
        memmove(&tile_buffers[tile_row][group_start],
                &tile_buffers[tile_row][group_start + 1],
                (group_end - group_start - 1) * sizeof(tile_buffers[0][0]));
        tile_buffers[tile_row][group_end - 1] = largest;
      }
    }

    for (tile_col = tile_cols_start; tile_col < tile_cols_end;) {
      // Launch workers for individual columns
      for (i = 0; i < num_workers && tile_col < tile_cols_end;
           ++i, ++tile_col) {
        TileBufferDec *const buf = &tile_buffers[tile_row][tile_col];
        AVxWorker *const worker = &pbi->tile_workers[i];
        TileWorkerData *const twd = (TileWorkerData *)worker->data1;
        TileInfo *const tile_info = (TileInfo *)worker->data2;

        twd->pbi = pbi;
        twd->xd = pbi->mb;
        twd->xd.corrupted = 0;
        twd->xd.counts =
            cm->refresh_frame_context == REFRESH_FRAME_CONTEXT_BACKWARD
                ? &twd->counts
                : NULL;
        av1_zero(twd->dqcoeff);
        av1_tile_init(tile_info, cm, tile_row, buf->col);
        av1_tile_init(&twd->xd.tile, cm, tile_row, buf->col);
        setup_bool_decoder(buf->data, data_end, buf->size, &cm->error,
                           &twd->bit_reader, pbi->decrypt_cb,
                           pbi->decrypt_state);
        av1_init_macroblockd(cm, &twd->xd,
#if CONFIG_PVQ
                             twd->pvq_ref_coeff,
#endif
                             twd->dqcoeff);
#if CONFIG_PVQ
        daala_dec_init(cm, &twd->xd.daala_dec, &twd->bit_reader);
#endif
#if CONFIG_PALETTE
        twd->xd.plane[0].color_index_map = twd->color_index_map[0];
        twd->xd.plane[1].color_index_map = twd->color_index_map[1];
#endif  // CONFIG_PALETTE

        worker->had_error = 0;
        if (i == num_workers - 1 || tile_col == tile_cols_end - 1) {
          winterface->execute(worker);
        } else {
          winterface->launch(worker);
        }

#if !(CONFIG_ANS || CONFIG_EXT_TILE)
        if (tile_row == tile_rows - 1 && buf->col == tile_cols - 1) {
          final_worker = i;
        }
#endif  // !(CONFIG_ANS || CONFIG_EXT_TILE)
      }

      // Sync all workers
      for (; i > 0; --i) {
        AVxWorker *const worker = &pbi->tile_workers[i - 1];
        // TODO(jzern): The tile may have specific error data associated with
        // its aom_internal_error_info which could be propagated to the main
        // info in cm. Additionally once the threads have been synced and an
        // error is detected, there's no point in continuing to decode tiles.
        pbi->mb.corrupted |= !winterface->sync(worker);
      }
    }
  }

  // Accumulate thread frame counts.
  if (cm->refresh_frame_context == REFRESH_FRAME_CONTEXT_BACKWARD) {
    for (i = 0; i < num_workers; ++i) {
      TileWorkerData *const twd = (TileWorkerData *)pbi->tile_workers[i].data1;
      av1_accumulate_frame_counts(&cm->counts, &twd->counts);
    }
  }

#if CONFIG_EXT_TILE
  // Return the end of the last tile buffer
  return tile_buffers[tile_rows - 1][tile_cols - 1].raw_data_end;
#else
#if CONFIG_ANS
  return data_end;
#else
  assert(final_worker != -1);
  {
    TileWorkerData *const twd =
        (TileWorkerData *)pbi->tile_workers[final_worker].data1;
    return aom_reader_find_end(&twd->bit_reader);
  }
#endif  // CONFIG_ANS
#endif  // CONFIG_EXT_TILE
}

static void error_handler(void *data) {
  AV1_COMMON *const cm = (AV1_COMMON *)data;
  aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME, "Truncated packet");
}

static void read_bitdepth_colorspace_sampling(AV1_COMMON *cm,
                                              struct aom_read_bit_buffer *rb) {
  if (cm->profile >= PROFILE_2) {
    cm->bit_depth = aom_rb_read_bit(rb) ? AOM_BITS_12 : AOM_BITS_10;
#if CONFIG_AOM_HIGHBITDEPTH
    cm->use_highbitdepth = 1;
#endif
  } else {
    cm->bit_depth = AOM_BITS_8;
#if CONFIG_AOM_HIGHBITDEPTH
    cm->use_highbitdepth = 0;
#endif
  }
  cm->color_space = aom_rb_read_literal(rb, 3);
  if (cm->color_space != AOM_CS_SRGB) {
    // [16,235] (including xvycc) vs [0,255] range
    cm->color_range = aom_rb_read_bit(rb);
    if (cm->profile == PROFILE_1 || cm->profile == PROFILE_3) {
      cm->subsampling_x = aom_rb_read_bit(rb);
      cm->subsampling_y = aom_rb_read_bit(rb);
      if (cm->subsampling_x == 1 && cm->subsampling_y == 1)
        aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                           "4:2:0 color not supported in profile 1 or 3");
      if (aom_rb_read_bit(rb))
        aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                           "Reserved bit set");
    } else {
      cm->subsampling_y = cm->subsampling_x = 1;
    }
  } else {
    if (cm->profile == PROFILE_1 || cm->profile == PROFILE_3) {
      // Note if colorspace is SRGB then 4:4:4 chroma sampling is assumed.
      // 4:2:2 or 4:4:0 chroma sampling is not allowed.
      cm->subsampling_y = cm->subsampling_x = 0;
      if (aom_rb_read_bit(rb))
        aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                           "Reserved bit set");
    } else {
      aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                         "4:4:4 color not supported in profile 0 or 2");
    }
  }
}

#if CONFIG_REFERENCE_BUFFER
void read_sequence_header(SequenceHeader *seq_params) {
  /* Placeholder for actually reading from the bitstream */
  seq_params->frame_id_numbers_present_flag = FRAME_ID_NUMBERS_PRESENT_FLAG;
  seq_params->frame_id_length_minus7 = FRAME_ID_LENGTH_MINUS7;
  seq_params->delta_frame_id_length_minus2 = DELTA_FRAME_ID_LENGTH_MINUS2;
}
#endif

static size_t read_uncompressed_header(AV1Decoder *pbi,
                                       struct aom_read_bit_buffer *rb) {
  AV1_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;
  BufferPool *const pool = cm->buffer_pool;
  RefCntBuffer *const frame_bufs = pool->frame_bufs;
  int i, mask, ref_index = 0;
  size_t sz;

#if CONFIG_REFERENCE_BUFFER
  /* TODO: Move outside frame loop or inside key-frame branch */
  read_sequence_header(&pbi->seq_params);
#endif

  cm->last_frame_type = cm->frame_type;
  cm->last_intra_only = cm->intra_only;

#if CONFIG_EXT_REFS
  // NOTE: By default all coded frames to be used as a reference
  cm->is_reference_frame = 1;
#endif  // CONFIG_EXT_REFS

  if (aom_rb_read_literal(rb, 2) != AOM_FRAME_MARKER)
    aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                       "Invalid frame marker");

  cm->profile = av1_read_profile(rb);
#if CONFIG_AOM_HIGHBITDEPTH
  if (cm->profile >= MAX_PROFILES)
    aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                       "Unsupported bitstream profile");
#else
  if (cm->profile >= PROFILE_2)
    aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                       "Unsupported bitstream profile");
#endif

  cm->show_existing_frame = aom_rb_read_bit(rb);

  if (cm->show_existing_frame) {
    // Show an existing frame directly.
    const int existing_frame_idx = aom_rb_read_literal(rb, 3);
    const int frame_to_show = cm->ref_frame_map[existing_frame_idx];
#if CONFIG_REFERENCE_BUFFER
    if (pbi->seq_params.frame_id_numbers_present_flag) {
      int frame_id_length = pbi->seq_params.frame_id_length_minus7 + 7;
      int display_frame_id = aom_rb_read_literal(rb, frame_id_length);
      /* Compare display_frame_id with ref_frame_id and check valid for
      * referencing */
      if (display_frame_id != cm->ref_frame_id[existing_frame_idx] ||
          cm->valid_for_referencing[existing_frame_idx] == 0)
        aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                           "Reference buffer frame ID mismatch");
    }
#endif
    lock_buffer_pool(pool);
    if (frame_to_show < 0 || frame_bufs[frame_to_show].ref_count < 1) {
      unlock_buffer_pool(pool);
      aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                         "Buffer %d does not contain a decoded frame",
                         frame_to_show);
    }
    ref_cnt_fb(frame_bufs, &cm->new_fb_idx, frame_to_show);
    unlock_buffer_pool(pool);

    cm->lf.filter_level = 0;
    cm->show_frame = 1;
    pbi->refresh_frame_flags = 0;

    if (cm->frame_parallel_decode) {
      for (i = 0; i < REF_FRAMES; ++i)
        cm->next_ref_frame_map[i] = cm->ref_frame_map[i];
    }

    return 0;
  }

  cm->frame_type = (FRAME_TYPE)aom_rb_read_bit(rb);
  cm->show_frame = aom_rb_read_bit(rb);
  cm->error_resilient_mode = aom_rb_read_bit(rb);
#if CONFIG_REFERENCE_BUFFER
  if (pbi->seq_params.frame_id_numbers_present_flag) {
    int frame_id_length = pbi->seq_params.frame_id_length_minus7 + 7;
    int diff_len = pbi->seq_params.delta_frame_id_length_minus2 + 2;
    int prev_frame_id = 0;
    if (cm->frame_type != KEY_FRAME) {
      prev_frame_id = cm->current_frame_id;
    }
    cm->current_frame_id = aom_rb_read_literal(rb, frame_id_length);

    if (cm->frame_type != KEY_FRAME) {
      int diff_frame_id;
      if (cm->current_frame_id > prev_frame_id) {
        diff_frame_id = cm->current_frame_id - prev_frame_id;
      } else {
        diff_frame_id =
            (1 << frame_id_length) + cm->current_frame_id - prev_frame_id;
      }
      /* Check current_frame_id for conformance */
      if (prev_frame_id == cm->current_frame_id ||
          diff_frame_id >= (1 << (frame_id_length - 1))) {
        aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                           "Invalid value of current_frame_id");
      }
    }
    /* Check if some frames need to be marked as not valid for referencing */
    for (i = 0; i < REF_FRAMES; i++) {
      if (cm->frame_type == KEY_FRAME) {
        cm->valid_for_referencing[i] = 0;
      } else if (cm->current_frame_id - (1 << diff_len) > 0) {
        if (cm->ref_frame_id[i] > cm->current_frame_id ||
            cm->ref_frame_id[i] < cm->current_frame_id - (1 << diff_len))
          cm->valid_for_referencing[i] = 0;
      } else {
        if (cm->ref_frame_id[i] > cm->current_frame_id &&
            cm->ref_frame_id[i] <
                (1 << frame_id_length) + cm->current_frame_id - (1 << diff_len))
          cm->valid_for_referencing[i] = 0;
      }
    }
  }
#endif
  if (cm->frame_type == KEY_FRAME) {
    if (!av1_read_sync_code(rb))
      aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                         "Invalid frame sync code");

    read_bitdepth_colorspace_sampling(cm, rb);
    pbi->refresh_frame_flags = (1 << REF_FRAMES) - 1;

    for (i = 0; i < INTER_REFS_PER_FRAME; ++i) {
      cm->frame_refs[i].idx = INVALID_IDX;
      cm->frame_refs[i].buf = NULL;
    }

    setup_frame_size(cm, rb);
    if (pbi->need_resync) {
      memset(&cm->ref_frame_map, -1, sizeof(cm->ref_frame_map));
      pbi->need_resync = 0;
    }
#if CONFIG_PALETTE
    cm->allow_screen_content_tools = aom_rb_read_bit(rb);
#endif  // CONFIG_PALETTE
  } else {
    cm->intra_only = cm->show_frame ? 0 : aom_rb_read_bit(rb);
#if CONFIG_PALETTE
    if (cm->intra_only) cm->allow_screen_content_tools = aom_rb_read_bit(rb);
#endif  // CONFIG_PALETTE
    if (cm->error_resilient_mode) {
      cm->reset_frame_context = RESET_FRAME_CONTEXT_ALL;
    } else {
      if (cm->intra_only) {
        cm->reset_frame_context = aom_rb_read_bit(rb)
                                      ? RESET_FRAME_CONTEXT_ALL
                                      : RESET_FRAME_CONTEXT_CURRENT;
      } else {
        cm->reset_frame_context = aom_rb_read_bit(rb)
                                      ? RESET_FRAME_CONTEXT_CURRENT
                                      : RESET_FRAME_CONTEXT_NONE;
        if (cm->reset_frame_context == RESET_FRAME_CONTEXT_CURRENT)
          cm->reset_frame_context = aom_rb_read_bit(rb)
                                        ? RESET_FRAME_CONTEXT_ALL
                                        : RESET_FRAME_CONTEXT_CURRENT;
      }
    }

    if (cm->intra_only) {
      if (!av1_read_sync_code(rb))
        aom_internal_error(&cm->error, AOM_CODEC_UNSUP_BITSTREAM,
                           "Invalid frame sync code");

      read_bitdepth_colorspace_sampling(cm, rb);

      pbi->refresh_frame_flags = aom_rb_read_literal(rb, REF_FRAMES);
      setup_frame_size(cm, rb);
      if (pbi->need_resync) {
        memset(&cm->ref_frame_map, -1, sizeof(cm->ref_frame_map));
        pbi->need_resync = 0;
      }
    } else if (pbi->need_resync != 1) { /* Skip if need resync */
      pbi->refresh_frame_flags = aom_rb_read_literal(rb, REF_FRAMES);

#if CONFIG_EXT_REFS
      if (!pbi->refresh_frame_flags) {
        // NOTE: "pbi->refresh_frame_flags == 0" indicates that the coded frame
        //       will not be used as a reference
        cm->is_reference_frame = 0;
      }
#endif  // CONFIG_EXT_REFS

      for (i = 0; i < INTER_REFS_PER_FRAME; ++i) {
        const int ref = aom_rb_read_literal(rb, REF_FRAMES_LOG2);
        const int idx = cm->ref_frame_map[ref];
        RefBuffer *const ref_frame = &cm->frame_refs[i];
        ref_frame->idx = idx;
        ref_frame->buf = &frame_bufs[idx].buf;
        cm->ref_frame_sign_bias[LAST_FRAME + i] = aom_rb_read_bit(rb);
#if CONFIG_REFERENCE_BUFFER
        if (pbi->seq_params.frame_id_numbers_present_flag) {
          int frame_id_length = pbi->seq_params.frame_id_length_minus7 + 7;
          int diff_len = pbi->seq_params.delta_frame_id_length_minus2 + 2;
          int delta_frame_id_minus1 = aom_rb_read_literal(rb, diff_len);
          int ref_frame_id =
              ((cm->current_frame_id - (delta_frame_id_minus1 + 1) +
                (1 << frame_id_length)) %
               (1 << frame_id_length));
          /* Compare values derived from delta_frame_id_minus1 and
          * refresh_frame_flags. Also, check valid for referencing */
          if (ref_frame_id != cm->ref_frame_id[ref] ||
              cm->valid_for_referencing[ref] == 0)
            aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                               "Reference buffer frame ID mismatch");
        }
#endif
      }

#if CONFIG_FRAME_SIZE
      if (cm->error_resilient_mode == 0) {
        setup_frame_size_with_refs(cm, rb);
      } else {
        setup_frame_size(cm, rb);
      }
#else
      setup_frame_size_with_refs(cm, rb);
#endif

      cm->allow_high_precision_mv = aom_rb_read_bit(rb);
      cm->interp_filter = read_frame_interp_filter(rb);

      for (i = 0; i < INTER_REFS_PER_FRAME; ++i) {
        RefBuffer *const ref_buf = &cm->frame_refs[i];
#if CONFIG_AOM_HIGHBITDEPTH
        av1_setup_scale_factors_for_frame(
            &ref_buf->sf, ref_buf->buf->y_crop_width,
            ref_buf->buf->y_crop_height, cm->width, cm->height,
            cm->use_highbitdepth);
#else
        av1_setup_scale_factors_for_frame(
            &ref_buf->sf, ref_buf->buf->y_crop_width,
            ref_buf->buf->y_crop_height, cm->width, cm->height);
#endif
      }
    }
  }

#if CONFIG_REFERENCE_BUFFER
  if (pbi->seq_params.frame_id_numbers_present_flag) {
    /* If bitmask is set, update reference frame id values and
    mark frames as valid for reference */
    int refresh_frame_flags =
        cm->frame_type == KEY_FRAME ? 0xFF : pbi->refresh_frame_flags;
    for (i = 0; i < REF_FRAMES; i++) {
      if ((refresh_frame_flags >> i) & 1) {
        cm->ref_frame_id[i] = cm->current_frame_id;
        cm->valid_for_referencing[i] = 1;
      }
    }
  }
#endif

#if CONFIG_AOM_HIGHBITDEPTH
  get_frame_new_buffer(cm)->bit_depth = cm->bit_depth;
#endif
  get_frame_new_buffer(cm)->color_space = cm->color_space;
  get_frame_new_buffer(cm)->color_range = cm->color_range;
  get_frame_new_buffer(cm)->render_width = cm->render_width;
  get_frame_new_buffer(cm)->render_height = cm->render_height;

  if (pbi->need_resync) {
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Keyframe / intra-only frame required to reset decoder"
                       " state");
  }

  if (!cm->error_resilient_mode) {
    cm->refresh_frame_context = aom_rb_read_bit(rb)
                                    ? REFRESH_FRAME_CONTEXT_FORWARD
                                    : REFRESH_FRAME_CONTEXT_BACKWARD;
  } else {
    cm->refresh_frame_context = REFRESH_FRAME_CONTEXT_FORWARD;
  }

  // This flag will be overridden by the call to av1_setup_past_independence
  // below, forcing the use of context 0 for those frame types.
  cm->frame_context_idx = aom_rb_read_literal(rb, FRAME_CONTEXTS_LOG2);

  // Generate next_ref_frame_map.
  lock_buffer_pool(pool);
  for (mask = pbi->refresh_frame_flags; mask; mask >>= 1) {
    if (mask & 1) {
      cm->next_ref_frame_map[ref_index] = cm->new_fb_idx;
      ++frame_bufs[cm->new_fb_idx].ref_count;
    } else {
      cm->next_ref_frame_map[ref_index] = cm->ref_frame_map[ref_index];
    }
    // Current thread holds the reference frame.
    if (cm->ref_frame_map[ref_index] >= 0)
      ++frame_bufs[cm->ref_frame_map[ref_index]].ref_count;
    ++ref_index;
  }

  for (; ref_index < REF_FRAMES; ++ref_index) {
    cm->next_ref_frame_map[ref_index] = cm->ref_frame_map[ref_index];

    // Current thread holds the reference frame.
    if (cm->ref_frame_map[ref_index] >= 0)
      ++frame_bufs[cm->ref_frame_map[ref_index]].ref_count;
  }
  unlock_buffer_pool(pool);
  pbi->hold_ref_buf = 1;

  if (frame_is_intra_only(cm) || cm->error_resilient_mode)
    av1_setup_past_independence(cm);

#if CONFIG_EXT_PARTITION
  set_sb_size(cm, aom_rb_read_bit(rb) ? BLOCK_128X128 : BLOCK_64X64);
#else
  set_sb_size(cm, BLOCK_64X64);
#endif  // CONFIG_EXT_PARTITION

  setup_loopfilter(cm, rb);
#if CONFIG_DERING
  setup_dering(cm, rb);
#endif
#if CONFIG_CLPF
  setup_clpf(pbi, rb);
#endif
#if CONFIG_LOOP_RESTORATION
  av1_alloc_restoration_buffers(cm);
  decode_restoration_mode(cm, rb);
#endif  // CONFIG_LOOP_RESTORATION
  setup_quantization(cm, rb);
#if CONFIG_AOM_HIGHBITDEPTH
  xd->bd = (int)cm->bit_depth;
#endif

#if CONFIG_ENTROPY
  av1_default_coef_probs(cm);
  if (cm->frame_type == KEY_FRAME || cm->error_resilient_mode ||
      cm->reset_frame_context == RESET_FRAME_CONTEXT_ALL) {
    for (i = 0; i < FRAME_CONTEXTS; ++i) cm->frame_contexts[i] = *cm->fc;
  } else if (cm->reset_frame_context == RESET_FRAME_CONTEXT_CURRENT) {
    cm->frame_contexts[cm->frame_context_idx] = *cm->fc;
  }
#endif  // CONFIG_ENTROPY

  setup_segmentation(cm, rb);

#if CONFIG_DELTA_Q
  {
    struct segmentation *const seg = &cm->seg;
    int segment_quantizer_active = 0;
    for (i = 0; i < MAX_SEGMENTS; i++) {
      if (segfeature_active(seg, i, SEG_LVL_ALT_Q)) {
        segment_quantizer_active = 1;
      }
    }

    cm->delta_q_res = 1;
    if (segment_quantizer_active == 0) {
      cm->delta_q_present_flag = aom_rb_read_bit(rb);
    } else {
      cm->delta_q_present_flag = 0;
    }
    if (cm->delta_q_present_flag) {
      xd->prev_qindex = cm->base_qindex;
      cm->delta_q_res = 1 << aom_rb_read_literal(rb, 2);
    }
  }
#endif

  for (i = 0; i < MAX_SEGMENTS; ++i) {
    const int qindex = cm->seg.enabled
                           ? av1_get_qindex(&cm->seg, i, cm->base_qindex)
                           : cm->base_qindex;
    xd->lossless[i] = qindex == 0 && cm->y_dc_delta_q == 0 &&
                      cm->uv_dc_delta_q == 0 && cm->uv_ac_delta_q == 0;
    xd->qindex[i] = qindex;
  }

  setup_segmentation_dequant(cm);
  cm->tx_mode =
      (!cm->seg.enabled && xd->lossless[0]) ? ONLY_4X4 : read_tx_mode(rb);
  cm->reference_mode = read_frame_reference_mode(cm, rb);

  read_tile_info(pbi, rb);
  sz = aom_rb_read_literal(rb, 16);

  if (sz == 0)
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Invalid header size");
  return sz;
}

#if CONFIG_EXT_TX
#if !CONFIG_EC_ADAPT || !CONFIG_DAALA_EC
static void read_ext_tx_probs(FRAME_CONTEXT *fc, aom_reader *r) {
  int i, j, k;
  int s;
  for (s = 1; s < EXT_TX_SETS_INTER; ++s) {
    if (aom_read(r, GROUP_DIFF_UPDATE_PROB, ACCT_STR)) {
      for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
        if (!use_inter_ext_tx_for_txsize[s][i]) continue;
        for (j = 0; j < num_ext_tx_set_inter[s] - 1; ++j)
          av1_diff_update_prob(r, &fc->inter_ext_tx_prob[s][i][j], ACCT_STR);
      }
    }
  }

  for (s = 1; s < EXT_TX_SETS_INTRA; ++s) {
    if (aom_read(r, GROUP_DIFF_UPDATE_PROB, ACCT_STR)) {
      for (i = TX_4X4; i < EXT_TX_SIZES; ++i) {
        if (!use_intra_ext_tx_for_txsize[s][i]) continue;
        for (j = 0; j < INTRA_MODES; ++j)
          for (k = 0; k < num_ext_tx_set_intra[s] - 1; ++k)
            av1_diff_update_prob(r, &fc->intra_ext_tx_prob[s][i][j][k],
                                 ACCT_STR);
      }
    }
  }
}
#endif  // !CONFIG_EC_ADAPT || !CONFIG_DAALA_EC
#else

#endif  // CONFIG_EXT_TX
#if CONFIG_SUPERTX
static void read_supertx_probs(FRAME_CONTEXT *fc, aom_reader *r) {
  int i, j;
  if (aom_read(r, GROUP_DIFF_UPDATE_PROB, ACCT_STR)) {
    for (i = 0; i < PARTITION_SUPERTX_CONTEXTS; ++i) {
      for (j = TX_8X8; j < TX_SIZES; ++j) {
        av1_diff_update_prob(r, &fc->supertx_prob[i][j], ACCT_STR);
      }
    }
  }
}
#endif  // CONFIG_SUPERTX

#if CONFIG_GLOBAL_MOTION
static void read_global_motion_params(WarpedMotionParams *params,
                                      aom_prob *probs, aom_reader *r) {
  TransformationType type =
      aom_read_tree(r, av1_global_motion_types_tree, probs, ACCT_STR);
  set_default_gmparams(params);
  params->wmtype = type;
  switch (type) {
    case HOMOGRAPHY:
      params->wmmat[6] = aom_read_primitive_symmetric(r, GM_ABS_ROW3HOMO_BITS) *
                         GM_ROW3HOMO_DECODE_FACTOR;
      params->wmmat[7] = aom_read_primitive_symmetric(r, GM_ABS_ROW3HOMO_BITS) *
                         GM_ROW3HOMO_DECODE_FACTOR;
    case AFFINE:
    case ROTZOOM:
      params->wmmat[2] = aom_read_primitive_symmetric(r, GM_ABS_ALPHA_BITS) *
                             GM_ALPHA_DECODE_FACTOR +
                         (1 << WARPEDMODEL_PREC_BITS);
      params->wmmat[3] = aom_read_primitive_symmetric(r, GM_ABS_ALPHA_BITS) *
                         GM_ALPHA_DECODE_FACTOR;
      if (type == AFFINE || type == HOMOGRAPHY) {
        params->wmmat[4] = aom_read_primitive_symmetric(r, GM_ABS_ALPHA_BITS) *
                           GM_ALPHA_DECODE_FACTOR;
        params->wmmat[5] = aom_read_primitive_symmetric(r, GM_ABS_ALPHA_BITS) *
                               GM_ALPHA_DECODE_FACTOR +
                           (1 << WARPEDMODEL_PREC_BITS);
      } else {
        params->wmmat[4] = -params->wmmat[3];
        params->wmmat[5] = params->wmmat[2];
      }
    // fallthrough intended
    case TRANSLATION:
      params->wmmat[0] = aom_read_primitive_symmetric(r, GM_ABS_TRANS_BITS) *
                         GM_TRANS_DECODE_FACTOR;
      params->wmmat[1] = aom_read_primitive_symmetric(r, GM_ABS_TRANS_BITS) *
                         GM_TRANS_DECODE_FACTOR;
      break;
    case IDENTITY: break;
    default: assert(0);
  }
}

static void read_global_motion(AV1_COMMON *cm, aom_reader *r) {
  int frame;
  for (frame = LAST_FRAME; frame <= ALTREF_FRAME; ++frame) {
    read_global_motion_params(&cm->global_motion[frame],
                              cm->fc->global_motion_types_prob, r);
    /*
    printf("Dec Ref %d [%d/%d]: %d %d %d %d\n",
           frame, cm->current_video_frame, cm->show_frame,
           cm->global_motion[frame].wmmat[0],
           cm->global_motion[frame].wmmat[1],
           cm->global_motion[frame].wmmat[2],
           cm->global_motion[frame].wmmat[3]);
           */
  }
}
#endif  // CONFIG_GLOBAL_MOTION

static int read_compressed_header(AV1Decoder *pbi, const uint8_t *data,
                                  size_t partition_size) {
  AV1_COMMON *const cm = &pbi->common;
#if CONFIG_SUPERTX
  MACROBLOCKD *const xd = &pbi->mb;
#endif
  FRAME_CONTEXT *const fc = cm->fc;
  aom_reader r;
  int k, i;
#if !CONFIG_EC_ADAPT || CONFIG_EXT_INTRA
  int j;
#endif

#if CONFIG_ANS && ANS_MAX_SYMBOLS
  r.window_size = ANS_MAX_SYMBOLS;
#endif
  if (aom_reader_init(&r, data, partition_size, pbi->decrypt_cb,
                      pbi->decrypt_state))
    aom_internal_error(&cm->error, AOM_CODEC_MEM_ERROR,
                       "Failed to allocate bool decoder 0");

#if CONFIG_LOOP_RESTORATION
  decode_restoration(cm, &r);
#endif

  if (cm->tx_mode == TX_MODE_SELECT) read_tx_size_probs(fc, &r);

#if !CONFIG_PVQ
  read_coef_probs(fc, cm->tx_mode, &r);

#if CONFIG_VAR_TX
  for (k = 0; k < TXFM_PARTITION_CONTEXTS; ++k)
    av1_diff_update_prob(&r, &fc->txfm_partition_prob[k], ACCT_STR);
#endif  // CONFIG_VAR_TX
#endif  // !CONFIG_PVQ
  for (k = 0; k < SKIP_CONTEXTS; ++k)
    av1_diff_update_prob(&r, &fc->skip_probs[k], ACCT_STR);

#if CONFIG_DELTA_Q
  for (k = 0; k < DELTA_Q_CONTEXTS; ++k)
    av1_diff_update_prob(&r, &fc->delta_q_prob[k], ACCT_STR);
#endif

#if !CONFIG_EC_ADAPT
  if (cm->seg.enabled && cm->seg.update_map) {
    if (cm->seg.temporal_update) {
      for (k = 0; k < PREDICTION_PROBS; k++)
        av1_diff_update_prob(&r, &cm->fc->seg.pred_probs[k], ACCT_STR);
    }
    for (k = 0; k < MAX_SEGMENTS - 1; k++)
      av1_diff_update_prob(&r, &cm->fc->seg.tree_probs[k], ACCT_STR);
  }

  for (j = 0; j < INTRA_MODES; j++) {
    for (i = 0; i < INTRA_MODES - 1; ++i)
      av1_diff_update_prob(&r, &fc->uv_mode_prob[j][i], ACCT_STR);
  }

#if CONFIG_EXT_PARTITION_TYPES
  for (i = 0; i < PARTITION_TYPES - 1; ++i)
    av1_diff_update_prob(&r, &fc->partition_prob[0][i], ACCT_STR);
  for (j = 1; j < PARTITION_CONTEXTS; ++j)
    for (i = 0; i < EXT_PARTITION_TYPES - 1; ++i)
      av1_diff_update_prob(&r, &fc->partition_prob[j][i], ACCT_STR);
#else
  for (j = 0; j < PARTITION_CONTEXTS; ++j)
    for (i = 0; i < PARTITION_TYPES - 1; ++i)
      av1_diff_update_prob(&r, &fc->partition_prob[j][i], ACCT_STR);
#endif  // CONFIG_EXT_PARTITION_TYPES
#endif  // EC_ADAPT, DAALA_EC
#if CONFIG_EXT_INTRA
#if CONFIG_INTRA_INTERP
  for (i = 0; i < INTRA_FILTERS + 1; ++i)
    for (j = 0; j < INTRA_FILTERS - 1; ++j)
      av1_diff_update_prob(&r, &fc->intra_filter_probs[i][j], ACCT_STR);
#endif  // CONFIG_INTRA_INTERP
#endif  // EC_ADAPT, DAALA_EC

  if (frame_is_intra_only(cm)) {
    av1_copy(cm->kf_y_prob, av1_kf_y_mode_prob);
#if CONFIG_EC_MULTISYMBOL
    av1_copy(cm->kf_y_cdf, av1_kf_y_mode_cdf);
#endif
#if !CONFIG_EC_ADAPT
    for (k = 0; k < INTRA_MODES; k++)
      for (j = 0; j < INTRA_MODES; j++)
        for (i = 0; i < INTRA_MODES - 1; ++i)
          av1_diff_update_prob(&r, &cm->kf_y_prob[k][j][i], ACCT_STR);
#endif
  } else {
#if !CONFIG_REF_MV
    nmv_context *const nmvc = &fc->nmvc;
#endif
    read_inter_mode_probs(fc, &r);

#if CONFIG_EXT_INTER
    read_inter_compound_mode_probs(fc, &r);
    if (cm->reference_mode != COMPOUND_REFERENCE) {
      for (i = 0; i < BLOCK_SIZE_GROUPS; i++) {
        if (is_interintra_allowed_bsize_group(i)) {
          av1_diff_update_prob(&r, &fc->interintra_prob[i], ACCT_STR);
        }
      }
      for (i = 0; i < BLOCK_SIZE_GROUPS; i++) {
        for (j = 0; j < INTERINTRA_MODES - 1; j++)
          av1_diff_update_prob(&r, &fc->interintra_mode_prob[i][j], ACCT_STR);
      }
      for (i = 0; i < BLOCK_SIZES; i++) {
        if (is_interintra_allowed_bsize(i) && is_interintra_wedge_used(i)) {
          av1_diff_update_prob(&r, &fc->wedge_interintra_prob[i], ACCT_STR);
        }
      }
    }
    if (cm->reference_mode != SINGLE_REFERENCE) {
      for (i = 0; i < BLOCK_SIZES; i++) {
        for (j = 0; j < COMPOUND_TYPES - 1; j++) {
          av1_diff_update_prob(&r, &fc->compound_type_prob[i][j], ACCT_STR);
        }
      }
    }
#endif  // CONFIG_EXT_INTER

#if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
    for (i = BLOCK_8X8; i < BLOCK_SIZES; ++i) {
      for (j = 0; j < MOTION_MODES - 1; ++j)
        av1_diff_update_prob(&r, &fc->motion_mode_prob[i][j], ACCT_STR);
    }
#endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION

#if !CONFIG_EC_ADAPT
    if (cm->interp_filter == SWITCHABLE) read_switchable_interp_probs(fc, &r);
#endif

    for (i = 0; i < INTRA_INTER_CONTEXTS; i++)
      av1_diff_update_prob(&r, &fc->intra_inter_prob[i], ACCT_STR);

    if (cm->reference_mode != SINGLE_REFERENCE)
      setup_compound_reference_mode(cm);
    read_frame_reference_mode_probs(cm, &r);

#if !CONFIG_EC_ADAPT
    for (j = 0; j < BLOCK_SIZE_GROUPS; j++) {
      for (i = 0; i < INTRA_MODES - 1; ++i)
        av1_diff_update_prob(&r, &fc->y_mode_prob[j][i], ACCT_STR);
    }
#endif

#if CONFIG_REF_MV
    for (i = 0; i < NMV_CONTEXTS; ++i)
      read_mv_probs(&fc->nmvc[i], cm->allow_high_precision_mv, &r);
#else
    read_mv_probs(nmvc, cm->allow_high_precision_mv, &r);
#endif
#if !CONFIG_EC_ADAPT
    read_ext_tx_probs(fc, &r);
#endif  // EC_ADAPT, DAALA_EC
#if CONFIG_SUPERTX
    if (!xd->lossless[0]) read_supertx_probs(fc, &r);
#endif
#if CONFIG_GLOBAL_MOTION
    read_global_motion(cm, &r);
#endif  // EC_ADAPT, DAALA_EC
  }
#if CONFIG_EC_MULTISYMBOL
  av1_coef_pareto_cdfs(fc);
#if CONFIG_REF_MV
  for (i = 0; i < NMV_CONTEXTS; ++i) av1_set_mv_cdfs(&fc->nmvc[i]);
#else
  av1_set_mv_cdfs(&fc->nmvc);
#endif
#if CONFIG_EC_MULTISYMBOL
  av1_set_mode_cdfs(cm);
#endif
#endif

  return aom_reader_has_error(&r);
}

#ifdef NDEBUG
#define debug_check_frame_counts(cm) (void)0
#else  // !NDEBUG
// Counts should only be incremented when frame_parallel_decoding_mode and
// error_resilient_mode are disabled.
static void debug_check_frame_counts(const AV1_COMMON *const cm) {
  FRAME_COUNTS zero_counts;
  av1_zero(zero_counts);
  assert(cm->refresh_frame_context != REFRESH_FRAME_CONTEXT_BACKWARD ||
         cm->error_resilient_mode);
  assert(!memcmp(cm->counts.y_mode, zero_counts.y_mode,
                 sizeof(cm->counts.y_mode)));
  assert(!memcmp(cm->counts.uv_mode, zero_counts.uv_mode,
                 sizeof(cm->counts.uv_mode)));
  assert(!memcmp(cm->counts.partition, zero_counts.partition,
                 sizeof(cm->counts.partition)));
  assert(!memcmp(cm->counts.coef, zero_counts.coef, sizeof(cm->counts.coef)));
  assert(!memcmp(cm->counts.eob_branch, zero_counts.eob_branch,
                 sizeof(cm->counts.eob_branch)));
  assert(!memcmp(cm->counts.switchable_interp, zero_counts.switchable_interp,
                 sizeof(cm->counts.switchable_interp)));
  assert(!memcmp(cm->counts.inter_mode, zero_counts.inter_mode,
                 sizeof(cm->counts.inter_mode)));
#if CONFIG_EXT_INTER
  assert(!memcmp(cm->counts.inter_compound_mode,
                 zero_counts.inter_compound_mode,
                 sizeof(cm->counts.inter_compound_mode)));
  assert(!memcmp(cm->counts.interintra, zero_counts.interintra,
                 sizeof(cm->counts.interintra)));
  assert(!memcmp(cm->counts.wedge_interintra, zero_counts.wedge_interintra,
                 sizeof(cm->counts.wedge_interintra)));
  assert(!memcmp(cm->counts.compound_interinter,
                 zero_counts.compound_interinter,
                 sizeof(cm->counts.compound_interinter)));
#endif  // CONFIG_EXT_INTER
#if CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
  assert(!memcmp(cm->counts.motion_mode, zero_counts.motion_mode,
                 sizeof(cm->counts.motion_mode)));
#endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
  assert(!memcmp(cm->counts.intra_inter, zero_counts.intra_inter,
                 sizeof(cm->counts.intra_inter)));
  assert(!memcmp(cm->counts.comp_inter, zero_counts.comp_inter,
                 sizeof(cm->counts.comp_inter)));
  assert(!memcmp(cm->counts.single_ref, zero_counts.single_ref,
                 sizeof(cm->counts.single_ref)));
  assert(!memcmp(cm->counts.comp_ref, zero_counts.comp_ref,
                 sizeof(cm->counts.comp_ref)));
#if CONFIG_EXT_REFS
  assert(!memcmp(cm->counts.comp_bwdref, zero_counts.comp_bwdref,
                 sizeof(cm->counts.comp_bwdref)));
#endif  // CONFIG_EXT_REFS
  assert(!memcmp(&cm->counts.tx_size, &zero_counts.tx_size,
                 sizeof(cm->counts.tx_size)));
  assert(!memcmp(cm->counts.skip, zero_counts.skip, sizeof(cm->counts.skip)));
#if CONFIG_REF_MV
  assert(
      !memcmp(&cm->counts.mv[0], &zero_counts.mv[0], sizeof(cm->counts.mv[0])));
  assert(
      !memcmp(&cm->counts.mv[1], &zero_counts.mv[1], sizeof(cm->counts.mv[0])));
#else
  assert(!memcmp(&cm->counts.mv, &zero_counts.mv, sizeof(cm->counts.mv)));
#endif
  assert(!memcmp(cm->counts.inter_ext_tx, zero_counts.inter_ext_tx,
                 sizeof(cm->counts.inter_ext_tx)));
  assert(!memcmp(cm->counts.intra_ext_tx, zero_counts.intra_ext_tx,
                 sizeof(cm->counts.intra_ext_tx)));
}
#endif  // NDEBUG

static struct aom_read_bit_buffer *init_read_bit_buffer(
    AV1Decoder *pbi, struct aom_read_bit_buffer *rb, const uint8_t *data,
    const uint8_t *data_end, uint8_t clear_data[MAX_AV1_HEADER_SIZE]) {
  rb->bit_offset = 0;
  rb->error_handler = error_handler;
  rb->error_handler_data = &pbi->common;
  if (pbi->decrypt_cb) {
    const int n = (int)AOMMIN(MAX_AV1_HEADER_SIZE, data_end - data);
    pbi->decrypt_cb(pbi->decrypt_state, data, clear_data, n);
    rb->bit_buffer = clear_data;
    rb->bit_buffer_end = clear_data + n;
  } else {
    rb->bit_buffer = data;
    rb->bit_buffer_end = data_end;
  }
  return rb;
}

//------------------------------------------------------------------------------

int av1_read_sync_code(struct aom_read_bit_buffer *const rb) {
  return aom_rb_read_literal(rb, 8) == AV1_SYNC_CODE_0 &&
         aom_rb_read_literal(rb, 8) == AV1_SYNC_CODE_1 &&
         aom_rb_read_literal(rb, 8) == AV1_SYNC_CODE_2;
}

void av1_read_frame_size(struct aom_read_bit_buffer *rb, int *width,
                         int *height) {
  *width = aom_rb_read_literal(rb, 16) + 1;
  *height = aom_rb_read_literal(rb, 16) + 1;
}

BITSTREAM_PROFILE av1_read_profile(struct aom_read_bit_buffer *rb) {
  int profile = aom_rb_read_bit(rb);
  profile |= aom_rb_read_bit(rb) << 1;
  if (profile > 2) profile += aom_rb_read_bit(rb);
  return (BITSTREAM_PROFILE)profile;
}

void av1_decode_frame(AV1Decoder *pbi, const uint8_t *data,
                      const uint8_t *data_end, const uint8_t **p_data_end) {
  AV1_COMMON *const cm = &pbi->common;
  MACROBLOCKD *const xd = &pbi->mb;
  struct aom_read_bit_buffer rb;
  int context_updated = 0;
  uint8_t clear_data[MAX_AV1_HEADER_SIZE];
  size_t first_partition_size;
  YV12_BUFFER_CONFIG *new_fb;

#if CONFIG_BITSTREAM_DEBUG
  bitstream_queue_set_frame_read(cm->current_video_frame * 2 + cm->show_frame);
#endif

  first_partition_size = read_uncompressed_header(
      pbi, init_read_bit_buffer(pbi, &rb, data, data_end, clear_data));
#if CONFIG_TILE_GROUPS
  pbi->first_partition_size = first_partition_size;
  pbi->uncomp_hdr_size = aom_rb_bytes_read(&rb);
#endif
  new_fb = get_frame_new_buffer(cm);
  xd->cur_buf = new_fb;
#if CONFIG_GLOBAL_MOTION
  xd->global_motion = cm->global_motion;
#endif  // CONFIG_GLOBAL_MOTION

  if (!first_partition_size) {
    // showing a frame directly
    *p_data_end = data + aom_rb_bytes_read(&rb);
    return;
  }

  data += aom_rb_bytes_read(&rb);
  if (!read_is_valid(data, first_partition_size, data_end))
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Truncated packet or corrupt header length");

#if CONFIG_REF_MV
  cm->setup_mi(cm);
#endif

  cm->use_prev_frame_mvs =
      !cm->error_resilient_mode && cm->width == cm->last_width &&
      cm->height == cm->last_height && !cm->last_intra_only &&
      cm->last_show_frame && (cm->last_frame_type != KEY_FRAME);
#if CONFIG_EXT_REFS
  // NOTE(zoeliu): As cm->prev_frame can take neither a frame of
  //               show_exisiting_frame=1, nor can it take a frame not used as
  //               a reference, it is probable that by the time it is being
  //               referred to, the frame buffer it originally points to may
  //               already get expired and have been reassigned to the current
  //               newly coded frame. Hence, we need to check whether this is
  //               the case, and if yes, we have 2 choices:
  //               (1) Simply disable the use of previous frame mvs; or
  //               (2) Have cm->prev_frame point to one reference frame buffer,
  //                   e.g. LAST_FRAME.
  if (cm->use_prev_frame_mvs && !dec_is_ref_frame_buf(pbi, cm->prev_frame)) {
    // Reassign the LAST_FRAME buffer to cm->prev_frame.
    RefBuffer *last_fb_ref_buf = &cm->frame_refs[LAST_FRAME - LAST_FRAME];
    cm->prev_frame = &cm->buffer_pool->frame_bufs[last_fb_ref_buf->idx];
  }
#endif  // CONFIG_EXT_REFS

  av1_setup_block_planes(xd, cm->subsampling_x, cm->subsampling_y);

  *cm->fc = cm->frame_contexts[cm->frame_context_idx];
  if (!cm->fc->initialized)
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Uninitialized entropy context.");

  av1_zero(cm->counts);

  xd->corrupted = 0;
  new_fb->corrupted = read_compressed_header(pbi, data, first_partition_size);
  if (new_fb->corrupted)
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Decode failed. Frame data header is corrupted.");

  if (cm->lf.filter_level && !cm->skip_loop_filter) {
    av1_loop_filter_frame_init(cm, cm->lf.filter_level);
  }

  // If encoded in frame parallel mode, frame context is ready after decoding
  // the frame header.
  if (cm->frame_parallel_decode &&
      cm->refresh_frame_context != REFRESH_FRAME_CONTEXT_BACKWARD) {
    AVxWorker *const worker = pbi->frame_worker_owner;
    FrameWorkerData *const frame_worker_data = worker->data1;
    if (cm->refresh_frame_context == REFRESH_FRAME_CONTEXT_FORWARD) {
      context_updated = 1;
      cm->frame_contexts[cm->frame_context_idx] = *cm->fc;
    }
    av1_frameworker_lock_stats(worker);
    pbi->cur_buf->row = -1;
    pbi->cur_buf->col = -1;
    frame_worker_data->frame_context_ready = 1;
    // Signal the main thread that context is ready.
    av1_frameworker_signal_stats(worker);
    av1_frameworker_unlock_stats(worker);
  }

#if CONFIG_ENTROPY
  av1_copy(cm->starting_coef_probs, cm->fc->coef_probs);
  cm->coef_probs_update_idx = 0;
#endif  // CONFIG_ENTROPY

  if (pbi->max_threads > 1
#if CONFIG_EXT_TILE
      && pbi->dec_tile_col < 0  // Decoding all columns
#endif                          // CONFIG_EXT_TILE
      && cm->tile_cols > 1) {
    // Multi-threaded tile decoder
    *p_data_end = decode_tiles_mt(pbi, data + first_partition_size, data_end);
    if (!xd->corrupted) {
      if (!cm->skip_loop_filter) {
        // If multiple threads are used to decode tiles, then we use those
        // threads to do parallel loopfiltering.
        av1_loop_filter_frame_mt(new_fb, cm, pbi->mb.plane, cm->lf.filter_level,
                                 0, 0, pbi->tile_workers, pbi->num_tile_workers,
                                 &pbi->lf_row_sync);
      }
    } else {
      aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                         "Decode failed. Frame data is corrupted.");
    }
  } else {
    *p_data_end = decode_tiles(pbi, data + first_partition_size, data_end);
  }
#if CONFIG_LOOP_RESTORATION
  if (cm->rst_info[0].frame_restoration_type != RESTORE_NONE ||
      cm->rst_info[1].frame_restoration_type != RESTORE_NONE ||
      cm->rst_info[2].frame_restoration_type != RESTORE_NONE) {
    av1_loop_restoration_frame(new_fb, cm, cm->rst_info, 7, 0, NULL);
  }
#endif  // CONFIG_LOOP_RESTORATION

#if CONFIG_DERING
  if (cm->dering_level && !cm->skip_loop_filter) {
    av1_dering_frame(&pbi->cur_buf->buf, cm, &pbi->mb, cm->dering_level);
  }
#endif  // CONFIG_DERING

#if CONFIG_CLPF
  if (!cm->skip_loop_filter) {
    const YV12_BUFFER_CONFIG *const frame = &pbi->cur_buf->buf;
    if (cm->clpf_strength_y) {
      av1_clpf_frame(frame, NULL, cm, cm->clpf_size != CLPF_NOSIZE,
                     cm->clpf_strength_y + (cm->clpf_strength_y == 3),
                     4 + cm->clpf_size, AOM_PLANE_Y, clpf_bit);
    }
    if (cm->clpf_strength_u) {
      av1_clpf_frame(frame, NULL, cm, 0,  // No block signals for chroma
                     cm->clpf_strength_u + (cm->clpf_strength_u == 3), 4,
                     AOM_PLANE_U, NULL);
    }
    if (cm->clpf_strength_v) {
      av1_clpf_frame(frame, NULL, cm, 0,  // No block signals for chroma
                     cm->clpf_strength_v + (cm->clpf_strength_v == 3), 4,
                     AOM_PLANE_V, NULL);
    }
  }
  if (cm->clpf_blocks) aom_free(cm->clpf_blocks);
#endif

  if (!xd->corrupted) {
    if (cm->refresh_frame_context == REFRESH_FRAME_CONTEXT_BACKWARD) {
#if CONFIG_ENTROPY
      cm->partial_prob_update = 0;
#endif  // CONFIG_ENTROPY
      av1_adapt_coef_probs(cm);
      av1_adapt_intra_frame_probs(cm);

      if (!frame_is_intra_only(cm)) {
        av1_adapt_inter_frame_probs(cm);
        av1_adapt_mv_probs(cm, cm->allow_high_precision_mv);
      }
    } else {
      debug_check_frame_counts(cm);
    }
  } else {
    aom_internal_error(&cm->error, AOM_CODEC_CORRUPT_FRAME,
                       "Decode failed. Frame data is corrupted.");
  }

  // Non frame parallel update frame context here.
  if (!cm->error_resilient_mode && !context_updated)
    cm->frame_contexts[cm->frame_context_idx] = *cm->fc;
}