decodeframe.c 205 KB
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/*
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 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
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 *
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 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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 */

#include <assert.h>
#include <stdlib.h>  // qsort()

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#include "./aom_config.h"
#include "./aom_dsp_rtcd.h"
#include "./aom_scale_rtcd.h"
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#include "./av1_rtcd.h"
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#include "aom/aom_codec.h"
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#include "aom_dsp/aom_dsp_common.h"
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#include "aom_dsp/bitreader.h"
#include "aom_dsp/bitreader_buffer.h"
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#include "aom_dsp/binary_codes_reader.h"
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#include "aom_mem/aom_mem.h"
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#include "aom_ports/mem.h"
#include "aom_ports/mem_ops.h"
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#include "aom_scale/aom_scale.h"
#include "aom_util/aom_thread.h"
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#if CONFIG_BITSTREAM_DEBUG
#include "aom_util/debug_util.h"
#endif  // CONFIG_BITSTREAM_DEBUG

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#include "av1/common/alloccommon.h"
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#if CONFIG_CDEF
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#include "av1/common/cdef.h"
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#include "av1/common/clpf.h"
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#endif
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#if CONFIG_INSPECTION
#include "av1/decoder/inspection.h"
#endif
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#include "av1/common/common.h"
#include "av1/common/entropy.h"
#include "av1/common/entropymode.h"
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#include "av1/common/entropymv.h"
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#include "av1/common/idct.h"
#include "av1/common/pred_common.h"
#include "av1/common/quant_common.h"
#include "av1/common/reconinter.h"
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#include "av1/common/reconintra.h"
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#if CONFIG_FRAME_SUPERRES
#include "av1/common/resize.h"
#endif  // CONFIG_FRAME_SUPERRES
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#include "av1/common/seg_common.h"
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#include "av1/common/thread_common.h"
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#include "av1/common/tile_common.h"
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#include "av1/decoder/decodeframe.h"
#include "av1/decoder/decodemv.h"
#include "av1/decoder/decoder.h"
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#if CONFIG_LV_MAP
#include "av1/decoder/decodetxb.h"
#endif
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#include "av1/decoder/detokenize.h"
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#include "av1/decoder/dsubexp.h"
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#if CONFIG_WARPED_MOTION || CONFIG_GLOBAL_MOTION
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#include "av1/common/warped_motion.h"
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#endif  // CONFIG_WARPED_MOTION || CONFIG_GLOBAL_MOTION
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#define MAX_AV1_HEADER_SIZE 80
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#define ACCT_STR __func__
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#if CONFIG_PVQ
#include "av1/common/partition.h"
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#include "av1/common/pvq.h"
#include "av1/common/scan.h"
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#include "av1/decoder/decint.h"
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#include "av1/decoder/pvq_decoder.h"
#include "av1/encoder/encodemb.h"
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#include "av1/encoder/hybrid_fwd_txfm.h"
#endif

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

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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);

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static int is_compound_reference_allowed(const AV1_COMMON *cm) {
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#if CONFIG_ONE_SIDED_COMPOUND || CONFIG_EXT_COMP_REFS  // Normative in decoder
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  return !frame_is_intra_only(cm);
#else
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  int i;
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  if (frame_is_intra_only(cm)) return 0;
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  for (i = 1; i < INTER_REFS_PER_FRAME; ++i)
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    if (cm->ref_frame_sign_bias[i + 1] != cm->ref_frame_sign_bias[1]) return 1;
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  return 0;
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#endif  // CONFIG_ONE_SIDED_COMPOUND || CONFIG_EXT_COMP_REFS
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}

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

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

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

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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));
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  return data > max ? max : data;
}

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static TX_MODE read_tx_mode(AV1_COMMON *cm, struct aom_read_bit_buffer *rb) {
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#if CONFIG_TX64X64
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  TX_MODE tx_mode;
#endif
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  if (cm->all_lossless) return ONLY_4X4;
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#if CONFIG_VAR_TX_NO_TX_MODE
  (void)rb;
  return TX_MODE_SELECT;
#else
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#if CONFIG_TX64X64
  tx_mode = aom_rb_read_bit(rb) ? TX_MODE_SELECT : aom_rb_read_literal(rb, 2);
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  if (tx_mode == ALLOW_32X32) tx_mode += aom_rb_read_bit(rb);
  return tx_mode;
#else
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  return aom_rb_read_bit(rb) ? TX_MODE_SELECT : aom_rb_read_literal(rb, 2);
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#endif  // CONFIG_TX64X64
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#endif  // CONFIG_VAR_TX_NO_TX_MODE
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}
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#if !CONFIG_NEW_MULTISYMBOL
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static void read_inter_mode_probs(FRAME_CONTEXT *fc, aom_reader *r) {
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  int i;
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  for (i = 0; i < NEWMV_MODE_CONTEXTS; ++i)
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    av1_diff_update_prob(r, &fc->newmv_prob[i], ACCT_STR);
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  for (i = 0; i < ZEROMV_MODE_CONTEXTS; ++i)
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    av1_diff_update_prob(r, &fc->zeromv_prob[i], ACCT_STR);
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  for (i = 0; i < REFMV_MODE_CONTEXTS; ++i)
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    av1_diff_update_prob(r, &fc->refmv_prob[i], ACCT_STR);
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  for (i = 0; i < DRL_MODE_CONTEXTS; ++i)
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    av1_diff_update_prob(r, &fc->drl_prob[i], ACCT_STR);
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}
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#endif
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static REFERENCE_MODE read_frame_reference_mode(
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    const AV1_COMMON *cm, struct aom_read_bit_buffer *rb) {
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  if (is_compound_reference_allowed(cm)) {
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#if CONFIG_REF_ADAPT
    return aom_rb_read_bit(rb) ? REFERENCE_MODE_SELECT : SINGLE_REFERENCE;
#else
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    return aom_rb_read_bit(rb)
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               ? REFERENCE_MODE_SELECT
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               : (aom_rb_read_bit(rb) ? COMPOUND_REFERENCE : SINGLE_REFERENCE);
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#endif  // CONFIG_REF_ADAPT
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  } else {
    return SINGLE_REFERENCE;
  }
}
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static void read_frame_reference_mode_probs(AV1_COMMON *cm, aom_reader *r) {
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#if CONFIG_NEW_MULTISYMBOL && !CONFIG_EXT_COMP_REFS
  (void)r;
#else
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  FRAME_CONTEXT *const fc = cm->fc;
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  int i;
#endif
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#if !CONFIG_NEW_MULTISYMBOL
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  if (cm->reference_mode == REFERENCE_MODE_SELECT)
    for (i = 0; i < COMP_INTER_CONTEXTS; ++i)
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      av1_diff_update_prob(r, &fc->comp_inter_prob[i], ACCT_STR);
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  if (cm->reference_mode != COMPOUND_REFERENCE) {
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    for (i = 0; i < REF_CONTEXTS; ++i) {
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      int j;
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      for (j = 0; j < (SINGLE_REFS - 1); ++j) {
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        av1_diff_update_prob(r, &fc->single_ref_prob[i][j], ACCT_STR);
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      }
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    }
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  }
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#endif
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  if (cm->reference_mode != SINGLE_REFERENCE) {
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#if CONFIG_EXT_COMP_REFS
    for (i = 0; i < COMP_REF_TYPE_CONTEXTS; ++i)
      av1_diff_update_prob(r, &fc->comp_ref_type_prob[i], ACCT_STR);

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    for (i = 0; i < UNI_COMP_REF_CONTEXTS; ++i) {
      int j;
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      for (j = 0; j < (UNIDIR_COMP_REFS - 1); ++j)
        av1_diff_update_prob(r, &fc->uni_comp_ref_prob[i][j], ACCT_STR);
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    }
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#endif  // CONFIG_EXT_COMP_REFS

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

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

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

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static void inverse_transform_block(MACROBLOCKD *xd, int plane,
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#if CONFIG_LGT
                                    PREDICTION_MODE mode,
#endif
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                                    const TX_TYPE tx_type,
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                                    const TX_SIZE tx_size, uint8_t *dst,
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                                    int stride, int16_t scan_line, int eob) {
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  struct macroblockd_plane *const pd = &xd->plane[plane];
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  tran_low_t *const dqcoeff = pd->dqcoeff;
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  av1_inverse_transform_block(xd, dqcoeff,
#if CONFIG_LGT
                              mode,
#endif
                              tx_type, tx_size, dst, stride, eob);
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  memset(dqcoeff, 0, (scan_line + 1) * sizeof(dqcoeff[0]));
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}

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static int get_block_idx(const MACROBLOCKD *xd, int plane, int row, int col) {
  const int bsize = xd->mi[0]->mbmi.sb_type;
  const struct macroblockd_plane *pd = &xd->plane[plane];
#if CONFIG_CHROMA_SUB8X8
  const BLOCK_SIZE plane_bsize =
      AOMMAX(BLOCK_4X4, get_plane_block_size(bsize, pd));
#elif 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 TX_SIZE tx_size = get_tx_size(plane, xd);
  const uint8_t txh_unit = tx_size_high_unit[tx_size];
  return row * max_blocks_wide + col * txh_unit;
}

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#if CONFIG_PVQ
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static int av1_pvq_decode_helper(MACROBLOCKD *xd, tran_low_t *ref_coeff,
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                                 tran_low_t *dqcoeff, int16_t *quant, int pli,
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                                 int bs, TX_TYPE tx_type, int xdec,
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                                 PVQ_SKIP_TYPE ac_dc_coded) {
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  unsigned int flags;  // used for daala's stream analyzer.
  int off;
  const int is_keyframe = 0;
  const int has_dc_skip = 1;
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  int coeff_shift = 3 - av1_get_tx_scale(bs);
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  int hbd_downshift = 0;
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  int rounding_mask;
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  // 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;
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  od_dec_ctx *dec = &xd->daala_dec;
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  int use_activity_masking = dec->use_activity_masking;
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  DECLARE_ALIGNED(16, tran_low_t, dqcoeff_pvq[OD_TXSIZE_MAX * OD_TXSIZE_MAX]);
  DECLARE_ALIGNED(16, tran_low_t, ref_coeff_pvq[OD_TXSIZE_MAX * OD_TXSIZE_MAX]);
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  od_coeff ref_int32[OD_TXSIZE_MAX * OD_TXSIZE_MAX];
  od_coeff out_int32[OD_TXSIZE_MAX * OD_TXSIZE_MAX];
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  hbd_downshift = xd->bd - 8;

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

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  assert(OD_COEFF_SHIFT >= 4);
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  if (lossless)
    pvq_dc_quant = 1;
  else {
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    if (use_activity_masking)
      pvq_dc_quant = OD_MAXI(
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          1, (quant[0] << (OD_COEFF_SHIFT - 3) >> hbd_downshift) *
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                     dec->state.pvq_qm_q4[pli][od_qm_get_index(bs, 0)] >>
                 4);
    else
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      pvq_dc_quant =
          OD_MAXI(1, quant[0] << (OD_COEFF_SHIFT - 3) >> hbd_downshift);
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  }

  off = od_qm_offset(bs, xdec);

  // copy int16 inputs to int32
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  for (i = 0; i < blk_size * blk_size; i++) {
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    ref_int32[i] =
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        AOM_SIGNED_SHL(ref_coeff_pvq[i], OD_COEFF_SHIFT - coeff_shift) >>
        hbd_downshift;
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  }
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  od_pvq_decode(dec, ref_int32, out_int32,
                OD_MAXI(1, quant[1] << (OD_COEFF_SHIFT - 3) >> hbd_downshift),
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                pli, bs, OD_PVQ_BETA[use_activity_masking][pli][bs],
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                is_keyframe, &flags, ac_dc_coded, dec->state.qm + off,
                dec->state.qm_inv + off);
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  if (!has_dc_skip || out_int32[0]) {
    out_int32[0] =
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        has_dc_skip + generic_decode(dec->r, &dec->state.adapt->model_dc[pli],
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                                     &dec->state.adapt->ex_dc[pli][bs][0], 2,
                                     "dc:mag");
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    if (out_int32[0]) out_int32[0] *= aom_read_bit(dec->r, "dc:sign") ? -1 : 1;
  }
  out_int32[0] = out_int32[0] * pvq_dc_quant + ref_int32[0];

  // copy int32 result back to int16
  assert(OD_COEFF_SHIFT > coeff_shift);
  rounding_mask = (1 << (OD_COEFF_SHIFT - coeff_shift - 1)) - 1;
  for (i = 0; i < blk_size * blk_size; i++) {
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    out_int32[i] = AOM_SIGNED_SHL(out_int32[i], hbd_downshift);
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    dqcoeff_pvq[i] = (out_int32[i] + (out_int32[i] < 0) + rounding_mask) >>
                     (OD_COEFF_SHIFT - coeff_shift);
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  }

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

  eob = blk_size * blk_size;

  return eob;
}

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static PVQ_SKIP_TYPE read_pvq_skip(AV1_COMMON *cm, MACROBLOCKD *const xd,
                                   int plane, TX_SIZE tx_size) {
  // 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
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  const int ac_dc_coded = aom_read_symbol(
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      xd->daala_dec.r,
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      xd->daala_dec.state.adapt->skip_cdf[2 * tx_size + (plane != 0)], 4,
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      "skip");
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  if (ac_dc_coded < 0 || ac_dc_coded > 3) {
    aom_internal_error(&cm->error, AOM_CODEC_INVALID_PARAM,
                       "Invalid PVQ Skip Type");
  }
  return ac_dc_coded;
}

static int av1_pvq_decode_helper2(AV1_COMMON *cm, MACROBLOCKD *const xd,
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                                  MB_MODE_INFO *const mbmi, int plane, int row,
                                  int col, TX_SIZE tx_size, TX_TYPE tx_type) {
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  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;
  uint8_t *dst;
  int eob;
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  const PVQ_SKIP_TYPE ac_dc_coded = read_pvq_skip(cm, xd, plane, tx_size);
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  eob = 0;
  dst = &pd->dst.buf[4 * row * pd->dst.stride + 4 * col];

  if (ac_dc_coded) {
    int xdec = pd->subsampling_x;
    int seg_id = mbmi->segment_id;
    int16_t *quant;
    FWD_TXFM_PARAM fwd_txfm_param;
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    // ToDo(yaowu): correct this with optimal number from decoding process.
    const int max_scan_line = tx_size_2d[tx_size];
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#if CONFIG_HIGHBITDEPTH
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    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
      for (j = 0; j < tx_blk_size; j++)
        for (i = 0; i < tx_blk_size; i++)
          pred[diff_stride * j + i] =
              CONVERT_TO_SHORTPTR(dst)[pd->dst.stride * j + i];
    } else {
#endif
      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];
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#if CONFIG_HIGHBITDEPTH
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    }
#endif
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    fwd_txfm_param.tx_type = tx_type;
    fwd_txfm_param.tx_size = tx_size;
    fwd_txfm_param.lossless = xd->lossless[seg_id];
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#if CONFIG_LGT
    fwd_txfm_param.is_inter = is_inter_block(mbmi);
    fwd_txfm_param.dst = dst;
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    int block = get_block_idx(xd, plane, row, col);
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    fwd_txfm_param.mode = get_prediction_mode(xd->mi[0], plane, tx_size, block);
#endif
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#if CONFIG_HIGHBITDEPTH
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    if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
      fwd_txfm_param.bd = xd->bd;
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      av1_highbd_fwd_txfm(pred, pvq_ref_coeff, diff_stride, &fwd_txfm_param);
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    } else {
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#endif  // CONFIG_HIGHBITDEPTH
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      av1_fwd_txfm(pred, pvq_ref_coeff, diff_stride, &fwd_txfm_param);
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#if CONFIG_HIGHBITDEPTH
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    }
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#endif  // CONFIG_HIGHBITDEPTH
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    quant = &pd->seg_dequant[seg_id][0];  // aom's quantizer

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    eob = av1_pvq_decode_helper(xd, pvq_ref_coeff, dqcoeff, quant, plane,
                                tx_size, tx_type, xdec, ac_dc_coded);
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    inverse_transform_block(xd, plane,
#if CONFIG_LGT
                            fwd_txfm_param.mode,
#endif
                            tx_type, tx_size, dst, pd->dst.stride,
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                            max_scan_line, eob);
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  }

  return eob;
}
#endif

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#if CONFIG_DPCM_INTRA
static void process_block_dpcm_vert(TX_SIZE tx_size, TX_TYPE_1D tx_type_1d,
                                    const tran_low_t *dqcoeff, uint8_t *dst,
                                    int dst_stride) {
  const int tx1d_width = tx_size_wide[tx_size];
  const int tx1d_height = tx_size_high[tx_size];
  dpcm_inv_txfm_add_func inverse_tx =
      av1_get_dpcm_inv_txfm_add_func(tx1d_width);
  for (int r = 0; r < tx1d_height; ++r) {
    if (r > 0) memcpy(dst, dst - dst_stride, tx1d_width * sizeof(dst[0]));
    inverse_tx(dqcoeff, 1, tx_type_1d, dst);
    dqcoeff += tx1d_width;
    dst += dst_stride;
  }
}

static void process_block_dpcm_horz(TX_SIZE tx_size, TX_TYPE_1D tx_type_1d,
                                    const tran_low_t *dqcoeff, uint8_t *dst,
                                    int dst_stride) {
  const int tx1d_width = tx_size_wide[tx_size];
  const int tx1d_height = tx_size_high[tx_size];
  dpcm_inv_txfm_add_func inverse_tx =
      av1_get_dpcm_inv_txfm_add_func(tx1d_height);
  tran_low_t tx_buff[64];
  for (int c = 0; c < tx1d_width; ++c, ++dqcoeff, ++dst) {
    for (int r = 0; r < tx1d_height; ++r) {
      if (c > 0) dst[r * dst_stride] = dst[r * dst_stride - 1];
      tx_buff[r] = dqcoeff[r * tx1d_width];
    }
    inverse_tx(tx_buff, dst_stride, tx_type_1d, dst);
  }
}

#if CONFIG_HIGHBITDEPTH
static void hbd_process_block_dpcm_vert(TX_SIZE tx_size, TX_TYPE_1D tx_type_1d,
                                        int bd, const tran_low_t *dqcoeff,
                                        uint8_t *dst8, int dst_stride) {
  uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
  const int tx1d_width = tx_size_wide[tx_size];
  const int tx1d_height = tx_size_high[tx_size];
  hbd_dpcm_inv_txfm_add_func inverse_tx =
      av1_get_hbd_dpcm_inv_txfm_add_func(tx1d_width);
  for (int r = 0; r < tx1d_height; ++r) {
    if (r > 0) memcpy(dst, dst - dst_stride, tx1d_width * sizeof(dst[0]));
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    inverse_tx(dqcoeff, 1, tx_type_1d, bd, dst, 1);
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    dqcoeff += tx1d_width;
    dst += dst_stride;
  }
}

static void hbd_process_block_dpcm_horz(TX_SIZE tx_size, TX_TYPE_1D tx_type_1d,
                                        int bd, const tran_low_t *dqcoeff,
                                        uint8_t *dst8, int dst_stride) {
  uint16_t *dst = CONVERT_TO_SHORTPTR(dst8);
  const int tx1d_width = tx_size_wide[tx_size];
  const int tx1d_height = tx_size_high[tx_size];
  hbd_dpcm_inv_txfm_add_func inverse_tx =
      av1_get_hbd_dpcm_inv_txfm_add_func(tx1d_height);
  tran_low_t tx_buff[64];
  switch (tx1d_height) {
    case 4: inverse_tx = av1_hbd_dpcm_inv_txfm_add_4_c; break;
    case 8: inverse_tx = av1_hbd_dpcm_inv_txfm_add_8_c; break;
    case 16: inverse_tx = av1_hbd_dpcm_inv_txfm_add_16_c; break;
    case 32: inverse_tx = av1_hbd_dpcm_inv_txfm_add_32_c; break;
    default: assert(0);
  }

  for (int c = 0; c < tx1d_width; ++c, ++dqcoeff, ++dst) {
    for (int r = 0; r < tx1d_height; ++r) {
      if (c > 0) dst[r * dst_stride] = dst[r * dst_stride - 1];
      tx_buff[r] = dqcoeff[r * tx1d_width];
    }
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    inverse_tx(tx_buff, dst_stride, tx_type_1d, bd, dst, 0);
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  }
}
#endif  // CONFIG_HIGHBITDEPTH

static void inverse_transform_block_dpcm(MACROBLOCKD *xd, int plane,
                                         PREDICTION_MODE mode, TX_SIZE tx_size,
                                         TX_TYPE tx_type, uint8_t *dst,
                                         int dst_stride, int16_t scan_line) {
  struct macroblockd_plane *const pd = &xd->plane[plane];
  tran_low_t *const dqcoeff = pd->dqcoeff;
  TX_TYPE_1D tx_type_1d = DCT_1D;
  switch (tx_type) {
    case IDTX: tx_type_1d = IDTX_1D; break;
    case V_DCT:
      assert(mode == H_PRED);
      tx_type_1d = DCT_1D;
      break;
    case H_DCT:
      assert(mode == V_PRED);
      tx_type_1d = DCT_1D;
      break;
    default: assert(0);
  }
  switch (mode) {
    case V_PRED:
#if CONFIG_HIGHBITDEPTH
      if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
        hbd_process_block_dpcm_vert(tx_size, tx_type_1d, xd->bd, dqcoeff, dst,
                                    dst_stride);
      } else {
#endif  // CONFIG_HIGHBITDEPTH
        process_block_dpcm_vert(tx_size, tx_type_1d, dqcoeff, dst, dst_stride);
#if CONFIG_HIGHBITDEPTH
      }
#endif  // CONFIG_HIGHBITDEPTH
      break;
    case H_PRED:
#if CONFIG_HIGHBITDEPTH
      if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
        hbd_process_block_dpcm_horz(tx_size, tx_type_1d, xd->bd, dqcoeff, dst,
                                    dst_stride);
      } else {
#endif  // CONFIG_HIGHBITDEPTH
        process_block_dpcm_horz(tx_size, tx_type_1d, dqcoeff, dst, dst_stride);
#if CONFIG_HIGHBITDEPTH
      }
#endif  // CONFIG_HIGHBITDEPTH
      break;
    default: assert(0);
  }
  memset(dqcoeff, 0, (scan_line + 1) * sizeof(dqcoeff[0]));
}
#endif  // CONFIG_DPCM_INTRA

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static void predict_and_reconstruct_intra_block(
    AV1_COMMON *cm, MACROBLOCKD *const xd, aom_reader *const r,
    MB_MODE_INFO *const mbmi, int plane, int row, int col, TX_SIZE tx_size) {
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  PLANE_TYPE plane_type = get_plane_type(plane);
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  const int block_idx = get_block_idx(xd, plane, row, col);
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#if CONFIG_PVQ
  (void)r;
#endif
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  av1_predict_intra_block_facade(xd, plane, block_idx, col, row, tx_size);
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  if (!mbmi->skip) {
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#if !CONFIG_PVQ
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    struct macroblockd_plane *const pd = &xd->plane[plane];
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#if CONFIG_LV_MAP
    int16_t max_scan_line = 0;
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    int eob;
    av1_read_coeffs_txb_facade(cm, xd, r, row, col, block_idx, plane,
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                               pd->dqcoeff, tx_size, &max_scan_line, &eob);
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    // tx_type will be read out in av1_read_coeffs_txb_facade
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    const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, block_idx, tx_size);
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#else   // CONFIG_LV_MAP
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    const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, block_idx, tx_size);
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    const SCAN_ORDER *scan_order = get_scan(cm, tx_size, tx_type, mbmi);
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    int16_t max_scan_line = 0;
    const int eob =
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        av1_decode_block_tokens(cm, xd, plane, scan_order, col, row, tx_size,
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                                tx_type, &max_scan_line, r, mbmi->segment_id);
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#endif  // CONFIG_LV_MAP
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    if (eob) {
      uint8_t *dst =
          &pd->dst.buf[(row * pd->dst.stride + col) << tx_size_wide_log2[0]];
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#if CONFIG_DPCM_INTRA || CONFIG_LGT
      const PREDICTION_MODE mode =
          get_prediction_mode(xd->mi[0], plane, tx_size, block_idx);
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#if CONFIG_DPCM_INTRA
      if (av1_use_dpcm_intra(plane, mode, tx_type, mbmi)) {
        inverse_transform_block_dpcm(xd, plane, mode, tx_size, tx_type, dst,
                                     pd->dst.stride, max_scan_line);
      } else {
#endif  // CONFIG_DPCM_INTRA
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#endif  // CONFIG_DPCM_INTRA || CONFIG_LGT
        inverse_transform_block(xd, plane,
#if CONFIG_LGT
                                mode,
#endif
                                tx_type, tx_size, dst, pd->dst.stride,
                                max_scan_line, eob);
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#if CONFIG_DPCM_INTRA
      }
#endif  // CONFIG_DPCM_INTRA
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    }
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#else   // !CONFIG_PVQ
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    const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, block_idx, tx_size);
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    av1_pvq_decode_helper2(cm, xd, mbmi, plane, row, col, tx_size, tx_type);
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#endif  // !CONFIG_PVQ
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  }
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#if CONFIG_CFL
  if (plane == AOM_PLANE_Y) {
    struct macroblockd_plane *const pd = &xd->plane[plane];
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#if CONFIG_CB4X4 && !CONFIG_CHROMA_2X2
    const BLOCK_SIZE plane_bsize =
        AOMMAX(BLOCK_4X4, get_plane_block_size(mbmi->sb_type, pd));
#else
    const BLOCK_SIZE plane_bsize = get_plane_block_size(mbmi->sb_type, pd);
#endif
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    uint8_t *dst =
        &pd->dst.buf[(row * pd->dst.stride + col) << tx_size_wide_log2[0]];
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    // TODO (ltrudeau) Store sub-8x8 inter blocks when bottom right block is
    // intra predicted.
    cfl_store(xd->cfl, dst, pd->dst.stride, row, col, tx_size, plane_bsize);
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  }
#endif
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}

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#if CONFIG_VAR_TX && !CONFIG_COEF_INTERLEAVE
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static void decode_reconstruct_tx(AV1_COMMON *cm, MACROBLOCKD *const xd,
                                  aom_reader *r, MB_MODE_INFO *const mbmi,
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                                  int plane, BLOCK_SIZE plane_bsize,
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                                  int blk_row, int blk_col, int block,
                                  TX_SIZE tx_size, int *eob_total) {
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  const struct macroblockd_plane *const pd = &xd->plane[plane];
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  const BLOCK_SIZE bsize = txsize_to_bsize[tx_size];
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  const int tx_row = blk_row >> (1 - pd->subsampling_y);
  const int tx_col = blk_col >> (1 - pd->subsampling_x);
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  const TX_SIZE plane_tx_size =
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      plane ? uv_txsize_lookup[bsize][mbmi->inter_tx_size[tx_row][tx_col]][0][0]
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            : mbmi->inter_tx_size[tx_row][tx_col];
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  // Scale to match transform block unit.
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  const int max_blocks_high = max_block_high(xd, plane_bsize, plane);
  const int max_blocks_wide = max_block_wide(xd, plane_bsize, plane);
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  if (blk_row >= max_blocks_high || blk_col >= max_blocks_wide) return;
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  if (tx_size == plane_tx_size) {
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    PLANE_TYPE plane_type = get_plane_type(plane);
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#if CONFIG_LV_MAP
    int16_t max_scan_line = 0;
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    int eob;
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    av1_read_coeffs_txb_facade(cm, xd, r, blk_row, blk_col, block, plane,
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                               pd->dqcoeff, tx_size, &max_scan_line, &eob);
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    // tx_type will be read out in av1_read_coeffs_txb_facade
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    const TX_TYPE tx_type =
        av1_get_tx_type(plane_type, xd, block, plane_tx_size);
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#else   // CONFIG_LV_MAP
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    const TX_TYPE tx_type =
        av1_get_tx_type(plane_type, xd, block, plane_tx_size);
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    const SCAN_ORDER *sc = get_scan(cm, plane_tx_size, tx_type, mbmi);
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    int16_t max_scan_line = 0;
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    const int eob = av1_decode_block_tokens(
        cm, xd, plane, sc, blk_col, blk_row, plane_tx_size, tx_type,
        &max_scan_line, r, mbmi->segment_id);
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#endif  // CONFIG_LV_MAP
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    inverse_transform_block(xd, plane,
#if CONFIG_LGT
                            mbmi->mode,
#endif
                            tx_type, plane_tx_size,
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                            &pd->dst.buf[(blk_row * pd->dst.stride + blk_col)
                                         << tx_size_wide_log2[0]],
                            pd->dst.stride, max_scan_line, eob);
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    *eob_total += eob;
  } else {
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    const TX_SIZE sub_txs = sub_tx_size_map[tx_size];
    const int bsl = tx_size_wide_unit[sub_txs];
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    int sub_step = tx_size_wide_unit[sub_txs] * tx_size_high_unit[sub_txs];
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    assert(sub_txs < tx_size);
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    int i;

    assert(bsl > 0);

    for (i = 0; i < 4; ++i) {
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      const int offsetr = blk_row + (i >> 1) * bsl;
      const int offsetc = blk_col + (i & 0x01) * bsl;
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      if (offsetr >= max_blocks_high || offsetc >= max_blocks_wide) continue;
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      decode_reconstruct_tx(cm, xd, r, mbmi, plane, plane_bsize, offsetr,
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                            offsetc, block, sub_txs, eob_total);
      block += sub_step;
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    }
  }
}
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#endif  // CONFIG_VAR_TX
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#if !CONFIG_VAR_TX || CONFIG_SUPERTX || CONFIG_COEF_INTERLEAVE || \
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    (!CONFIG_VAR_TX && CONFIG_EXT_TX && CONFIG_RECT_TX)
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static int reconstruct_inter_block(AV1_COMMON *cm, MACROBLOCKD *const xd,
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                                   aom_reader *const r, int segment_id,
                                   int plane, int row, int col,
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                                   TX_SIZE tx_size) {
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  PLANE_TYPE plane_type = get_plane_type(plane);
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  int block_idx = get_block_idx(xd, plane, row, col);
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#if CONFIG_PVQ
  int eob;
  (void)r;
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  (void)segment_id;
#else
  struct macroblockd_plane *const pd = &xd->plane[plane];
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#endif

#if !CONFIG_PVQ
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#if CONFIG_LV_MAP
  (void)segment_id;
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  int16_t max_scan_line = 0;
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  int eob;
  av1_read_coeffs_txb_facade(cm, xd, r, row, col, block_idx, plane, pd->dqcoeff,
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                             tx_size, &max_scan_line, &eob);
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  // tx_type will be read out in av1_read_coeffs_txb_facade
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  const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, block_idx, tx_size);
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#else   // CONFIG_LV_MAP
  int16_t max_scan_line = 0;
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  const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, block_idx, tx_size);
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  const SCAN_ORDER *scan_order =
      get_scan(cm, tx_size, tx_type, &xd->mi[0]->mbmi);
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  const int eob =
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      av1_decode_block_tokens(cm, xd, plane, scan_order, col, row, tx_size,
                              tx_type, &max_scan_line, r, segment_id);
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#endif  // CONFIG_LV_MAP
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  uint8_t *dst =
      &pd->dst.buf[(row * pd->dst.stride + col) << tx_size_wide_log2[0]];
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  if (eob)
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    inverse_transform_block(xd, plane,
#if CONFIG_LGT
                            xd->mi[0]->mbmi.mode,
#endif
                            tx_type, tx_size, dst, pd->dst.stride,
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                            max_scan_line, eob);
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#else
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  const TX_TYPE tx_type = av1_get_tx_type(plane_type, xd, block_idx, tx_size);
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  eob = av1_pvq_decode_helper2(cm, xd, &xd->mi[0]->mbmi, plane, row, col,
                               tx_size, tx_type);
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#endif
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  return eob;
}
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#endif  // !CONFIG_VAR_TX || CONFIG_SUPER_TX
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static void 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) {
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  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;
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#if CONFIG_RD_DEBUG
  xd->mi[0]->mbmi.mi_row = mi_row;
  xd->mi[0]->mbmi.mi_col = mi_col;
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#endif
#if CONFIG_CFL
  xd->cfl->mi_row = mi_row;
  xd->cfl->mi_col = mi_col;
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#endif
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  for (y = 0; y < y_mis; ++y)
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    for (x = !y; x < x_mis; ++x) xd->mi[y * cm->mi_stride + x] = xd->mi[0];
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  set_plane_n4(xd, bw, bh);
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  set_skip_context(xd, mi_row, mi_col);

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

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  // 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,
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#if CONFIG_DEPENDENT_HORZTILES
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                 cm->dependent_horz_tiles,
#endif  // CONFIG_DEPENDENT_HORZTILES
                 cm->mi_rows, cm->mi_cols);
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  av1_setup_dst_planes(xd->plane, bsize, get_frame_new_buffer(cm), mi_row,
                       mi_col);
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}

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#if CONFIG_SUPERTX
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static MB_MODE_INFO *set_offsets_extend(AV1_COMMON *const cm,
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                                        MACROBLOCKD *const xd,
                                        const TileInfo *const tile,
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                                        BLOCK_SIZE bsize_pred, int mi_row_pred,
                                        int mi_col_pred, int mi_row_ori,
                                        int mi_col_ori) {
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  // Used in supertx
  // (mi_row_ori, mi_col_ori): location for mv
  // (mi_row_pred, mi_col_pred, bsize_pred): region to predict
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  const int bw = mi_size_wide[bsize_pred];
  const int bh = mi_size_high[bsize_pred];
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  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;
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  set_mi_row_col(xd, tile, mi_row_pred, bh, mi_col_pred, bw,
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#if CONFIG_DEPENDENT_HORZTILES
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                 cm->dependent_horz_tiles,
#endif  // CONFIG_DEPENDENT_HORZTILES
                 cm->mi_rows, cm->mi_cols);
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  xd->up_available = (mi_row_ori > tile->mi_row_start);
  xd->left_available = (mi_col_ori > tile->mi_col_start);
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  set_plane_n4(xd, bw, bh);
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  return &xd->mi[0]->mbmi;
}

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#if CONFIG_SUPERTX
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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) {
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  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)
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    for (x = !y; x < x_mis; ++x) xd->mi[y * cm->mi_stride + x] = xd->mi[0];
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  set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw,
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#if CONFIG_DEPENDENT_HORZTILES
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                 cm->dependent_horz_tiles,
#endif  // CONFIG_DEPENDENT_HORZTILES
                 cm->mi_rows, cm->mi_cols);
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  return &xd->mi[0]->mbmi;
}
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#endif
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static void set_offsets_topblock(AV1_COMMON *const cm, MACROBLOCKD *const xd,
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                                 const TileInfo *const tile, BLOCK_SIZE bsize,
                                 int mi_row, int mi_col) {
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  const int bw = mi_size_wide[bsize];
  const int bh = mi_size_high[bsize];
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  const int offset = mi_row * cm->mi_stride + mi_col;

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

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  set_plane_n4(xd, bw, bh);
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  set_mi_row_col(xd, tile, mi_row, bh, mi_col, bw,
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#if CONFIG_DEPENDENT_HORZTILES
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                 cm->dependent_horz_tiles,
#endif  // CONFIG_DEPENDENT_HORZTILES
                 cm->mi_rows, cm->mi_cols);
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  av1_setup_dst_planes(xd->plane, bsize, get_frame_new_buffer(cm), mi_row,
                       mi_col);
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}

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static void set_param_topblock(AV1_COMMON *const cm, MACROBLOCKD *const xd,
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                               BLOCK_SIZE bsize, int mi_row, int mi_col,
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                               int txfm, int skip) {
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  const int bw = mi_size_wide[bsize];
  const int bh = mi_size_high[bsize];
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  const int x_mis = AOMMIN(bw, cm->mi_cols - mi_col);
  const int y_mis = AOMMIN(bh, cm->mi_rows - mi_row);
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  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;
    }
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#if CONFIG_VAR_TX
  xd->above_txfm_context = cm->above_txfm_context + mi_col;
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  xd->left_txfm_context =
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      xd->left_txfm_context_buffer + (mi_row & MAX_MIB_MASK);
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  set_txfm_ctxs(xd->mi[0]->mbmi.tx_size, bw, bh, skip, xd);
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#endif
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}

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

static void dec_predict_b_extend(
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    AV1Decoder *const pbi, MACROBLOCKD *const xd, const TileInfo *const tile,
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    int block, int mi_row_ori, int mi_col_ori, int mi_row_pred, int mi_col_pred,
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    int mi_row_top, int mi_col_top, int plane, uint8_t *dst_buf, int dst_stride,
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    BLOCK_SIZE bsize_top, BLOCK_SIZE bsize_pred, int b_sub8x8, int bextend) {
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  // 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;
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  const int mi_width_top = mi_size_wide[bsize_top];
  const int mi_height_top = mi_size_high[bsize_top];
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  MB_MODE_INFO *mbmi;
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  AV1_COMMON *const cm = &pbi->common;
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  if (mi_row_pred < mi_row_top || mi_col_pred < mi_col_top ||
      mi_row_pred >= mi_row_top + mi_height_top ||
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      mi_col_pred >= mi_col_top + mi_width_top || mi_row_pred >= cm->mi_rows ||
      mi_col_pred >= cm->mi_cols)
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    return;

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  mbmi = set_offsets_extend(cm, xd, tile, bsize_pred, mi_row_pred, mi_col_pred,
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                            mi_row_ori, mi_col_ori);
  set_ref(cm, xd, 0, mi_row_pred, mi_col_pred);
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  if (has_second_ref(&xd->mi[0]->mbmi)
#if CONFIG_EXT_INTER && CONFIG_COMPOUND_SINGLEREF
      || is_inter_singleref_comp_mode(xd->mi[0]->mbmi.mode)
#endif  // CONFIG_EXT_INTER && CONFIG_COMPOUND_SINGLEREF
          )
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    set_ref(cm, xd, 1, mi_row_pred, mi_col_pred);
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  if (!bextend) mbmi->tx_size = max_txsize_lookup[bsize_top];
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  xd->plane[plane].dst.stride = dst_stride;
  xd->plane[plane].dst.buf =
      dst_buf + (r >> xd->plane[plane].subsampling_y) * dst_stride +
      (c >> xd->plane[plane].subsampling_x);
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  if (!b_sub8x8)
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    av1_build_inter_predictor_sb_extend(&pbi->common, xd,
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#if CONFIG_EXT_INTER
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                                        mi_row_ori, mi_col_ori,
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#endif  // CONFIG_EXT_INTER
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                                        mi_row_pred, mi_col_pred, plane,
                                        bsize_pred);
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  else
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    av1_build_inter_predictor_sb_sub8x8_extend(&pbi->common, xd,
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#if CONFIG_EXT_INTER
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                                               mi_row_ori, mi_col_ori,
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#endif  // CONFIG_EXT_INTER
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                                               mi_row_pred, mi_col_pred, plane,
                                               bsize_pred, block);
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}

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

  int wide_unit, high_unit;
  int i, j;
  int ext_offset = 0;
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  if (dir == 0 || dir == 1) {
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    extend_bsize =
        (mi_width == mi_size_wide[BLOCK_8X8] || bsize < BLOCK_8X8 || xss < yss)
            ? BLOCK_8X8
            : BLOCK_16X8;
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#if CONFIG_CB4X4
    if (bsize < BLOCK_8X8) {
      extend_bsize = BLOCK_4X4;
      ext_offset = mi_size_wide[BLOCK_8X8];
    }
#endif
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    wide_unit = mi_size_wide[extend_bsize];
    high_unit = mi_size_high[extend_bsize];
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    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)
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        dec_predict_b_extend(pbi, xd, tile, block, mi_row_ori, mi_col_ori,
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                             mi_row_pred + j, mi_col_pred + i, mi_row_top,
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