decodeframe.c 172 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_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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#include "av1/common/alloccommon.h"
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#if CONFIG_CLPF
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#include "aom/aom_image.h"
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#include "av1/common/clpf.h"
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#endif
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#include "av1/common/common.h"
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#if CONFIG_DERING
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#include "av1/common/dering.h"
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#endif  // CONFIG_DERING
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#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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#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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#include "av1/decoder/detokenize.h"
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#include "av1/decoder/dsubexp.h"
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#if CONFIG_WARPED_MOTION
#include "av1/common/warped_motion.h"
#endif  // CONFIG_WARPED_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/decoder/pvq_decoder.h"
#include "av1/encoder/encodemb.h"

#include "aom_dsp/entdec.h"
#include "av1/common/partition.h"
#include "av1/decoder/decint.h"
#include "av1/encoder/hybrid_fwd_txfm.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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  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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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(struct aom_read_bit_buffer *rb) {
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#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
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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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}
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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);
}

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#if !CONFIG_EC_ADAPT
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static void read_switchable_interp_probs(FRAME_CONTEXT *fc, aom_reader *r) {
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  int i, j;
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  for (j = 0; j < SWITCHABLE_FILTER_CONTEXTS; ++j) {
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    for (i = 0; i < SWITCHABLE_FILTERS - 1; ++i)
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      av1_diff_update_prob(r, &fc->switchable_interp_prob[j][i], ACCT_STR);
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  }
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}
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#endif
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static void read_inter_mode_probs(FRAME_CONTEXT *fc, aom_reader *r) {
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#if CONFIG_REF_MV
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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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#if CONFIG_EXT_INTER
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  av1_diff_update_prob(r, &fc->new2mv_prob, ACCT_STR);
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#endif  // CONFIG_EXT_INTER
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#else
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#if !CONFIG_EC_ADAPT
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  int i, j;
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  for (i = 0; i < INTER_MODE_CONTEXTS; ++i) {
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    for (j = 0; j < INTER_MODES - 1; ++j)
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      av1_diff_update_prob(r, &fc->inter_mode_probs[i][j], ACCT_STR);
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  }
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#else
  (void)fc;
  (void)r;
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#endif
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#endif
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}

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#if CONFIG_EXT_INTER
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static void read_inter_compound_mode_probs(FRAME_CONTEXT *fc, aom_reader *r) {
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  int i, j;
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  if (aom_read(r, GROUP_DIFF_UPDATE_PROB, ACCT_STR)) {
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    for (j = 0; j < INTER_MODE_CONTEXTS; ++j) {
      for (i = 0; i < INTER_COMPOUND_MODES - 1; ++i) {
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        av1_diff_update_prob(r, &fc->inter_compound_mode_probs[j][i], ACCT_STR);
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      }
    }
  }
}
#endif  // CONFIG_EXT_INTER
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#if !CONFIG_EC_ADAPT
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#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
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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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    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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  } 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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  FRAME_CONTEXT *const fc = cm->fc;
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  int i, j;
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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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      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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  if (cm->reference_mode != SINGLE_REFERENCE) {
    for (i = 0; i < REF_CONTEXTS; ++i) {
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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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}

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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 !CONFIG_EC_ADAPT
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  int j;
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  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];
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    for (j = 0; j < CLASS0_SIZE; ++j) {
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      update_mv_probs(comp_ctx->class0_fp[j], MV_FP_SIZE - 1, r);
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    }
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    update_mv_probs(comp_ctx->fp, MV_FP_SIZE - 1, r);
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  }
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#endif  // !CONFIG_EC_ADAPT
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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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                                    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;
  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];
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#if CONFIG_AOM_HIGHBITDEPTH
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  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 {
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#endif  // CONFIG_AOM_HIGHBITDEPTH
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    inv_txfm_add(dqcoeff, dst, stride, &inv_txfm_param);
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#if CONFIG_AOM_HIGHBITDEPTH
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  }
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#endif  // CONFIG_AOM_HIGHBITDEPTH
  memset(dqcoeff, 0, (scan_line + 1) * sizeof(dqcoeff[0]));
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}

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#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;
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  int quant_shift = get_tx_scale(bs);
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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;
  // TODO(yushin) : To enable activity masking,
  // int use_activity_masking = dec->use_activity_masking;
  int use_activity_masking = 0;

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

  if (lossless)
    pvq_dc_quant = 1;
  else {
    // TODO(yushin): Enable this for activity masking,
    // when pvq_qm_q4 is available in AOM.
    // pvq_dc_quant = OD_MAXI(1, quant*
    // dec->state.pvq_qm_q4[pli][od_qm_get_index(bs, 0)] >> 4);
    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],
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                OD_ROBUST_STREAM, is_keyframe, &flags, ac_dc_coded,
                dec->state.qm + off, dec->state.qm_inv + off);
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  // 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->ec, &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] *= od_ec_dec_bits(dec->ec, 1, "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;
}

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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) {
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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;
  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 = od_decode_cdf_adapt(
      xd->daala_dec.ec,
      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;
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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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    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.fwd_txfm_opt = FWD_TXFM_OPT_NORMAL;
    fwd_txfm_param.rd_transform = 0;
    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;

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

  return eob;
}
#endif

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static void predict_and_reconstruct_intra_block(AV1_COMMON *cm,
                                                MACROBLOCKD *const xd,
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#if CONFIG_ANS
                                                struct AnsDecoder *const r,
#else
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                                                aom_reader *r,
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#endif  // CONFIG_ANS
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                                                MB_MODE_INFO *const mbmi,
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                                                int plane, int row, int col,
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                                                TX_SIZE tx_size) {
  struct macroblockd_plane *const pd = &xd->plane[plane];
  PREDICTION_MODE mode = (plane == 0) ? mbmi->mode : mbmi->uv_mode;
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  PLANE_TYPE plane_type = (plane == 0) ? PLANE_TYPE_Y : PLANE_TYPE_UV;
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  uint8_t *dst;
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  int block_idx = (row << 1) + col;
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#if CONFIG_PVQ
  (void)cm;
  (void)r;
#endif
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  dst = &pd->dst.buf[(row * pd->dst.stride + col) << tx_size_wide_log2[0]];
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  if (mbmi->sb_type < BLOCK_8X8)
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    if (plane == 0) mode = xd->mi[0]->bmi[(row << 1) + col].as_mode;
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  av1_predict_intra_block(xd, pd->width, pd->height, tx_size, mode, dst,
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                          pd->dst.stride, dst, pd->dst.stride, col, row, plane);
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  if (!mbmi->skip) {
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    TX_TYPE tx_type = get_tx_type(plane_type, xd, block_idx, tx_size);
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#if !CONFIG_PVQ
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    const SCAN_ORDER *scan_order = get_scan(cm, tx_size, tx_type, 0);
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    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);
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#if CONFIG_ADAPT_SCAN
    av1_update_scan_count_facade(cm, tx_size, tx_type, pd->dqcoeff, eob);
#endif
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    if (eob)
      inverse_transform_block(xd, plane, tx_type, tx_size, dst, pd->dst.stride,
                              max_scan_line, eob);
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#else
    av1_pvq_decode_helper2(xd, mbmi, plane, row, col, tx_size, tx_type);
#endif
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  }
}

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#if CONFIG_VAR_TX
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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, 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 = (plane == 0) ? PLANE_TYPE_Y : PLANE_TYPE_UV;
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    int block_idx = (blk_row << 1) + blk_col;
    TX_TYPE tx_type = get_tx_type(plane_type, xd, block_idx, plane_tx_size);
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    const SCAN_ORDER *sc = get_scan(cm, plane_tx_size, tx_type, 1);
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    int16_t max_scan_line = 0;
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    const int eob =
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        av1_decode_block_tokens(xd, plane, sc, blk_col, blk_row, plane_tx_size,
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                                tx_type, &max_scan_line, r, mbmi->segment_id);
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    inverse_transform_block(
        xd, plane, tx_type, plane_tx_size,
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        &pd->dst.buf[4 * blk_row * pd->dst.stride + 4 * blk_col],
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        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 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, sub_txs, eob_total);
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    }
  }
}
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#endif  // CONFIG_VAR_TX
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#if !CONFIG_VAR_TX || CONFIG_SUPERTX || \
    (!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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#if CONFIG_ANS
                                   struct AnsDecoder *const r,
#else
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                                   aom_reader *r,
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#endif
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                                   int segment_id, int plane, int row, int col,
                                   TX_SIZE tx_size) {
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  PLANE_TYPE plane_type = (plane == 0) ? PLANE_TYPE_Y : PLANE_TYPE_UV;
  int block_idx = (row << 1) + col;
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  TX_TYPE tx_type = get_tx_type(plane_type, xd, block_idx, tx_size);
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#if CONFIG_PVQ
  int eob;
  (void)cm;
  (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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  const SCAN_ORDER *scan_order = get_scan(cm, tx_size, tx_type, 1);
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  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);
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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 CONFIG_ADAPT_SCAN
  av1_update_scan_count_facade(cm, tx_size, tx_type, pd->dqcoeff, eob);
#endif
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  if (eob)
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    inverse_transform_block(xd, plane, tx_type, tx_size, dst, pd->dst.stride,
                            max_scan_line, eob);
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#else
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  eob = av1_pvq_decode_helper2(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 MB_MODE_INFO *set_offsets(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 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;
#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, cm->mi_rows, cm->mi_cols);

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  av1_setup_dst_planes(xd->plane, get_frame_new_buffer(cm), mi_row, mi_col);
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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_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
  const int bw = num_8x8_blocks_wide_lookup[bsize_pred];
  const int bh = num_8x8_blocks_high_lookup[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;
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  set_mi_row_col(xd, tile, mi_row_pred, bh, mi_col_pred, bw, 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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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, cm->mi_rows, cm->mi_cols);
  return &xd->mi[0]->mbmi;
}

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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 = num_8x8_blocks_wide_lookup[bsize];
  const int bh = num_8x8_blocks_high_lookup[bsize];
  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, cm->mi_rows, cm->mi_cols);

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  av1_setup_dst_planes(xd->plane, 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 = num_8x8_blocks_wide_lookup[bsize];
  const int bh = num_8x8_blocks_high_lookup[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;
  RefBuffer *ref_buffer = &cm->frame_refs[mbmi->ref_frame[idx] - LAST_FRAME];
  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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  xd->corrupted |= ref_buffer->buf->corrupted;
}

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,
    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) {
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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;
  const int mi_width_top = num_8x8_blocks_wide_lookup[bsize_top];
  const int mi_height_top = num_8x8_blocks_high_lookup[bsize_top];
  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);
  if (has_second_ref(&xd->mi[0]->mbmi))
    set_ref(cm, xd, 1, mi_row_pred, mi_col_pred);

  if (!bextend) {
    mbmi->tx_size = b_width_log2_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)
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    av1_build_inter_predictors_sb_extend(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, bsize_pred);
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  else
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    av1_build_inter_predictors_sb_sub8x8_extend(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,
                                                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,
                           int mi_col, int mi_row_top, int mi_col_top,
                           uint8_t *dst_buf[3], int dst_stride[3], int dir) {
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  // dir: 0-lower, 1-upper, 2-left, 3-right
  //      4-lowerleft, 5-upperleft, 6-lowerright, 7-upperright
  const int mi_width = num_8x8_blocks_wide_lookup[bsize];
  const int mi_height = num_8x8_blocks_high_lookup[bsize];
  int xss = xd->plane[1].subsampling_x;
  int yss = xd->plane[1].subsampling_y;
  int b_sub8x8 = (bsize < BLOCK_8X8) ? 1 : 0;
  BLOCK_SIZE extend_bsize;
  int unit, mi_row_pred, mi_col_pred;

  if (dir == 0 || dir == 1) {
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    extend_bsize = (mi_width == 1 || bsize < BLOCK_8X8 || xss < yss)
                       ? BLOCK_8X8
                       : BLOCK_16X8;
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    unit = num_8x8_blocks_wide_lookup[extend_bsize];
    mi_row_pred = mi_row + ((dir == 0) ? mi_height : -1);
    mi_col_pred = mi_col;

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    dec_predict_b_extend(pbi, xd, tile, block, mi_row, mi_col, mi_row_pred,
                         mi_col_pred, mi_row_top, mi_col_top, dst_buf,
                         dst_stride, top_bsize, extend_bsize, b_sub8x8, 1);
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    if (mi_width > unit) {
      int i;
      assert(!b_sub8x8);
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      for (i = 0; i < mi_width / unit - 1; i++) {
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        mi_col_pred += unit;
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        dec_predict_b_extend(pbi, xd, tile, block, mi_row, mi_col, mi_row_pred,
                             mi_col_pred, mi_row_top, mi_col_top, dst_buf,
                             dst_stride, top_bsize, extend_bsize, b_sub8x8, 1);
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      }
    }
  } else if (dir == 2 || dir == 3) {
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    extend_bsize = (mi_height == 1 || bsize < BLOCK_8X8 || yss < xss)
                       ? BLOCK_8X8
                       : BLOCK_8X16;
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    unit = num_8x8_blocks_high_lookup[extend_bsize];
    mi_row_pred = mi_row;
    mi_col_pred = mi_col + ((dir == 3) ? mi_width : -1);

844 845 846
    dec_predict_b_extend(pbi, xd, tile, block, mi_row, mi_col, mi_row_pred,
                         mi_col_pred, mi_row_top, mi_col_top, dst_buf,
                         dst_stride, top_bsize, extend_bsize, b_sub8x8, 1);
847 848 849

    if (mi_height > unit) {
      int i;
850
      for (i = 0; i < mi_height / unit - 1; i++) {
851
        mi_row_pred += unit;
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        dec_predict_b_extend(pbi, xd, tile, block, mi_row, mi_col, mi_row_pred,
                             mi_col_pred, mi_row_top, mi_col_top, dst_buf,
                             dst_stride, top_bsize, extend_bsize, b_sub8x8, 1);
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      }
    }
  } else {
    extend_bsize = BLOCK_8X8;
    mi_row_pred = mi_row + ((dir == 4 || dir == 6) ? mi_height : -1);
    mi_col_pred = mi_col + ((dir == 6 || dir == 7) ? mi_width : -1);
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    dec_predict_b_extend(pbi, xd, tile, block, mi_row, mi_col, mi_row_pred,
                         mi_col_pred, mi_row_top, mi_col_top, dst_buf,
                         dst_stride, top_bsize, extend_bsize, b_sub8x8, 1);
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  }
}

867
static void dec_extend_all(AV1Decoder *const pbi, MACROBLOCKD *const xd,
868
                           const TileInfo *const tile, int block,
869 870 871
                           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]) {
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  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);
}

890
static void dec_predict_sb_complex(AV1Decoder *const pbi, MACROBLOCKD *const xd,
891 892
                                   const TileInfo *const tile, int mi_row,
                                   int mi_col, int mi_row_top, int mi_col_top,
893 894
                                   BLOCK_SIZE bsize, BLOCK_SIZE top_bsize,
                                   uint8_t *dst_buf[3], int dst_stride[3]) {
895
  const AV1_COMMON *const cm = &pbi->common;
896 897 898
  const int hbs = num_8x8_blocks_wide_lookup[bsize] / 2;
  const PARTITION_TYPE partition = get_partition(cm, mi_row, mi_col, bsize);
  const BLOCK_SIZE subsize = get_subsize(bsize, partition);
899
#if CONFIG_EXT_PARTITION_TYPES
900
  const BLOCK_SIZE bsize2 = get_subsize(bsize, PARTITION_SPLIT);
901
#endif
902 903
  int i;
  const int mi_offset = mi_row * cm->mi_stride + mi_col;
904 905
  uint8_t *dst_buf1[3], *dst_buf2[3], *dst_buf3[3];

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  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 };
912

913
#if CONFIG_AOM_HIGHBITDEPTH
914 915 916
  if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
    int len = sizeof(uint16_t);
    dst_buf1[0] = CONVERT_TO_BYTEPTR(tmp_buf1);
917 918
    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);
919
    dst_buf2[0] = CONVERT_TO_BYTEPTR(tmp_buf2);
920 921
    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);
922
    dst_buf3[0] = CONVERT_TO_BYTEPTR(tmp_buf3);
923 924
    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);
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  } else {
#endif
    dst_buf1[0] = tmp_buf1;
928 929
    dst_buf1[1] = tmp_buf1 + MAX_TX_SQUARE;
    dst_buf1[2] = tmp_buf1 + 2 * MAX_TX_SQUARE;
930
    dst_buf2[0] = tmp_buf2;
931 932
    dst_buf2[1] = tmp_buf2 + MAX_TX_SQUARE;
    dst_buf2[2] = tmp_buf2 + 2 * MAX_TX_SQUARE;
933
    dst_buf3[0] = tmp_buf3;
934 935
    dst_buf3[1] = tmp_buf3 + MAX_TX_SQUARE;
    dst_buf3[2] = tmp_buf3 + 2 * MAX_TX_SQUARE;
936
#if CONFIG_AOM_HIGHBITDEPTH
937 938 939
  }
#endif

940
  if (mi_row >= cm->mi_rows || mi_col >= cm->mi_cols) return;
941

942 943
  xd->mi = cm->mi_grid_visible + mi_offset;
  xd->mi[0] = cm->mi + mi_offset;
944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980

  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) {
        // 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];
981
        av1_build_masked_inter_predictor_complex(
982 983 984
            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);
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999
      } 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,
1000 1001
                               mi_row + hbs, mi_col, mi_row_top, mi_col_top,
                               dst_buf1, dst_stride1, top_bsize, subsize, 0, 0);
1002
          if (bsize < top_bsize)
1003 1004 1005
            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);
1006
          else
1007 1008 1009
            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);
1010 1011 1012 1013 1014

          // 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];
1015
            av1_build_masked_inter_predictor_complex(
1016
                xd, dst_buf[i], dst_stride[i], dst_buf1[i], dst_stride1[i],
1017 1018
                mi_row, mi_col, mi_row_top, mi_col_top, bsize, top_bsize,
                PARTITION_HORZ