rdopt.c 443 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 <math.h>

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#include "./aom_dsp_rtcd.h"
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#include "./av1_rtcd.h"
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#include "aom_dsp/aom_dsp_common.h"
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#include "aom_dsp/blend.h"
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#include "aom_mem/aom_mem.h"
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#include "aom_ports/mem.h"
#include "aom_ports/system_state.h"
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#include "av1/common/common.h"
#include "av1/common/common_data.h"
#include "av1/common/entropy.h"
#include "av1/common/entropymode.h"
#include "av1/common/idct.h"
#include "av1/common/mvref_common.h"
#include "av1/common/pred_common.h"
#include "av1/common/quant_common.h"
#include "av1/common/reconinter.h"
#include "av1/common/reconintra.h"
#include "av1/common/scan.h"
#include "av1/common/seg_common.h"
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#if CONFIG_WARPED_MOTION
#include "av1/common/warped_motion.h"
#endif  // CONFIG_WARPED_MOTION
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#include "av1/encoder/aq_variance.h"
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#include "av1/encoder/cost.h"
#include "av1/encoder/encodemb.h"
#include "av1/encoder/encodemv.h"
#include "av1/encoder/encoder.h"
#include "av1/encoder/hybrid_fwd_txfm.h"
#include "av1/encoder/mcomp.h"
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#if CONFIG_PALETTE
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#include "av1/encoder/palette.h"
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#endif  // CONFIG_PALETTE
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#include "av1/encoder/quantize.h"
#include "av1/encoder/ratectrl.h"
#include "av1/encoder/rd.h"
#include "av1/encoder/rdopt.h"
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#include "av1/encoder/tokenize.h"
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#if CONFIG_PVQ
#include "av1/encoder/pvq_encoder.h"
#endif
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#if CONFIG_PVQ || CONFIG_DAALA_DIST
#include "av1/common/pvq.h"
#endif
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#if CONFIG_DUAL_FILTER
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#define DUAL_FILTER_SET_SIZE (SWITCHABLE_FILTERS * SWITCHABLE_FILTERS)
static const int filter_sets[DUAL_FILTER_SET_SIZE][2] = {
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  { 0, 0 }, { 0, 1 }, { 0, 2 }, { 0, 3 }, { 1, 0 }, { 1, 1 },
  { 1, 2 }, { 1, 3 }, { 2, 0 }, { 2, 1 }, { 2, 2 }, { 2, 3 },
  { 3, 0 }, { 3, 1 }, { 3, 2 }, { 3, 3 },
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};
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#endif  // CONFIG_DUAL_FILTER
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#if CONFIG_EXT_REFS

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#define LAST_FRAME_MODE_MASK                                      \
  ((1 << INTRA_FRAME) | (1 << LAST2_FRAME) | (1 << LAST3_FRAME) | \
   (1 << GOLDEN_FRAME) | (1 << BWDREF_FRAME) | (1 << ALTREF_FRAME))
#define LAST2_FRAME_MODE_MASK                                    \
  ((1 << INTRA_FRAME) | (1 << LAST_FRAME) | (1 << LAST3_FRAME) | \
   (1 << GOLDEN_FRAME) | (1 << BWDREF_FRAME) | (1 << ALTREF_FRAME))
#define LAST3_FRAME_MODE_MASK                                    \
  ((1 << INTRA_FRAME) | (1 << LAST_FRAME) | (1 << LAST2_FRAME) | \
   (1 << GOLDEN_FRAME) | (1 << BWDREF_FRAME) | (1 << ALTREF_FRAME))
#define GOLDEN_FRAME_MODE_MASK                                   \
  ((1 << INTRA_FRAME) | (1 << LAST_FRAME) | (1 << LAST2_FRAME) | \
   (1 << LAST3_FRAME) | (1 << BWDREF_FRAME) | (1 << ALTREF_FRAME))
#define BWDREF_FRAME_MODE_MASK                                   \
  ((1 << INTRA_FRAME) | (1 << LAST_FRAME) | (1 << LAST2_FRAME) | \
   (1 << LAST3_FRAME) | (1 << GOLDEN_FRAME) | (1 << ALTREF_FRAME))
#define ALTREF_FRAME_MODE_MASK                                   \
  ((1 << INTRA_FRAME) | (1 << LAST_FRAME) | (1 << LAST2_FRAME) | \
   (1 << LAST3_FRAME) | (1 << GOLDEN_FRAME) | (1 << BWDREF_FRAME))

#else

#define LAST_FRAME_MODE_MASK \
  ((1 << GOLDEN_FRAME) | (1 << ALTREF_FRAME) | (1 << INTRA_FRAME))
#define GOLDEN_FRAME_MODE_MASK \
  ((1 << LAST_FRAME) | (1 << ALTREF_FRAME) | (1 << INTRA_FRAME))
#define ALTREF_FRAME_MODE_MASK \
  ((1 << LAST_FRAME) | (1 << GOLDEN_FRAME) | (1 << INTRA_FRAME))
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#endif  // CONFIG_EXT_REFS

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#if CONFIG_EXT_REFS
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#define SECOND_REF_FRAME_MASK ((1 << ALTREF_FRAME) | (1 << BWDREF_FRAME) | 0x01)
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#else
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#define SECOND_REF_FRAME_MASK ((1 << ALTREF_FRAME) | 0x01)
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#endif  // CONFIG_EXT_REFS
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#define MIN_EARLY_TERM_INDEX 3
#define NEW_MV_DISCOUNT_FACTOR 8
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#if CONFIG_EXT_INTRA
#define ANGLE_SKIP_THRESH 10
#define FILTER_FAST_SEARCH 1
#endif  // CONFIG_EXT_INTRA

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const double ADST_FLIP_SVM[8] = { -6.6623, -2.8062, -3.2531, 3.1671,    // vert
                                  -7.7051, -3.2234, -3.6193, 3.4533 };  // horz
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typedef struct {
  PREDICTION_MODE mode;
  MV_REFERENCE_FRAME ref_frame[2];
} MODE_DEFINITION;

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typedef struct { MV_REFERENCE_FRAME ref_frame[2]; } REF_DEFINITION;
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struct rdcost_block_args {
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  const AV1_COMP *cpi;
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  MACROBLOCK *x;
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  ENTROPY_CONTEXT t_above[2 * MAX_MIB_SIZE];
  ENTROPY_CONTEXT t_left[2 * MAX_MIB_SIZE];
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  RD_STATS rd_stats;
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  int64_t this_rd;
  int64_t best_rd;
  int exit_early;
  int use_fast_coef_costing;
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  const SCAN_ORDER *scan_order;
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};

#define LAST_NEW_MV_INDEX 6
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static const MODE_DEFINITION av1_mode_order[MAX_MODES] = {
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  { NEARESTMV, { LAST_FRAME, NONE } },
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#if CONFIG_EXT_REFS
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  { NEARESTMV, { LAST2_FRAME, NONE } },
  { NEARESTMV, { LAST3_FRAME, NONE } },
  { NEARESTMV, { BWDREF_FRAME, NONE } },
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#endif  // CONFIG_EXT_REFS
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  { NEARESTMV, { ALTREF_FRAME, NONE } },
  { NEARESTMV, { GOLDEN_FRAME, NONE } },
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  { DC_PRED, { INTRA_FRAME, NONE } },
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  { NEWMV, { LAST_FRAME, NONE } },
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#if CONFIG_EXT_REFS
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  { NEWMV, { LAST2_FRAME, NONE } },
  { NEWMV, { LAST3_FRAME, NONE } },
  { NEWMV, { BWDREF_FRAME, NONE } },
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#endif  // CONFIG_EXT_REFS
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  { NEWMV, { ALTREF_FRAME, NONE } },
  { NEWMV, { GOLDEN_FRAME, NONE } },
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  { NEARMV, { LAST_FRAME, NONE } },
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#if CONFIG_EXT_REFS
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  { NEARMV, { LAST2_FRAME, NONE } },
  { NEARMV, { LAST3_FRAME, NONE } },
  { NEARMV, { BWDREF_FRAME, NONE } },
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#endif  // CONFIG_EXT_REFS
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  { NEARMV, { ALTREF_FRAME, NONE } },
  { NEARMV, { GOLDEN_FRAME, NONE } },
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#if CONFIG_EXT_INTER
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  { NEWFROMNEARMV, { LAST_FRAME, NONE } },
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#if CONFIG_EXT_REFS
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  { NEWFROMNEARMV, { LAST2_FRAME, NONE } },
  { NEWFROMNEARMV, { LAST3_FRAME, NONE } },
  { NEWFROMNEARMV, { BWDREF_FRAME, NONE } },
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#endif  // CONFIG_EXT_REFS
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  { NEWFROMNEARMV, { ALTREF_FRAME, NONE } },
  { NEWFROMNEARMV, { GOLDEN_FRAME, NONE } },
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#endif  // CONFIG_EXT_INTER

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  { ZEROMV, { LAST_FRAME, NONE } },
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#if CONFIG_EXT_REFS
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  { ZEROMV, { LAST2_FRAME, NONE } },
  { ZEROMV, { LAST3_FRAME, NONE } },
  { ZEROMV, { BWDREF_FRAME, NONE } },
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#endif  // CONFIG_EXT_REFS
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  { ZEROMV, { GOLDEN_FRAME, NONE } },
  { ZEROMV, { ALTREF_FRAME, NONE } },
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// TODO(zoeliu): May need to reconsider the order on the modes to check
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#if CONFIG_EXT_INTER
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  { NEAREST_NEARESTMV, { LAST_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { NEAREST_NEARESTMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEAREST_NEARESTMV, { LAST3_FRAME, ALTREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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  { NEAREST_NEARESTMV, { GOLDEN_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { NEAREST_NEARESTMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEAREST_NEARESTMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEAREST_NEARESTMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEAREST_NEARESTMV, { GOLDEN_FRAME, BWDREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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#else  // CONFIG_EXT_INTER
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  { NEARESTMV, { LAST_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { NEARESTMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEARESTMV, { LAST3_FRAME, ALTREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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  { NEARESTMV, { GOLDEN_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { NEARESTMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEARESTMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEARESTMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEARESTMV, { GOLDEN_FRAME, BWDREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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#endif  // CONFIG_EXT_INTER
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  { TM_PRED, { INTRA_FRAME, NONE } },
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#if CONFIG_ALT_INTRA
  { SMOOTH_PRED, { INTRA_FRAME, NONE } },
#endif  // CONFIG_ALT_INTRA

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#if CONFIG_EXT_INTER
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  { NEAR_NEARESTMV, { LAST_FRAME, ALTREF_FRAME } },
  { NEAREST_NEARMV, { LAST_FRAME, ALTREF_FRAME } },
  { NEAR_NEARMV, { LAST_FRAME, ALTREF_FRAME } },
  { NEW_NEARESTMV, { LAST_FRAME, ALTREF_FRAME } },
  { NEAREST_NEWMV, { LAST_FRAME, ALTREF_FRAME } },
  { NEW_NEARMV, { LAST_FRAME, ALTREF_FRAME } },
  { NEAR_NEWMV, { LAST_FRAME, ALTREF_FRAME } },
  { NEW_NEWMV, { LAST_FRAME, ALTREF_FRAME } },
  { ZERO_ZEROMV, { LAST_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { NEAR_NEARESTMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEAREST_NEARMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEAR_NEARMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEW_NEARESTMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEAREST_NEWMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEW_NEARMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEAR_NEWMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEW_NEWMV, { LAST2_FRAME, ALTREF_FRAME } },
  { ZERO_ZEROMV, { LAST2_FRAME, ALTREF_FRAME } },

  { NEAR_NEARESTMV, { LAST3_FRAME, ALTREF_FRAME } },
  { NEAREST_NEARMV, { LAST3_FRAME, ALTREF_FRAME } },
  { NEAR_NEARMV, { LAST3_FRAME, ALTREF_FRAME } },
  { NEW_NEARESTMV, { LAST3_FRAME, ALTREF_FRAME } },
  { NEAREST_NEWMV, { LAST3_FRAME, ALTREF_FRAME } },
  { NEW_NEARMV, { LAST3_FRAME, ALTREF_FRAME } },
  { NEAR_NEWMV, { LAST3_FRAME, ALTREF_FRAME } },
  { NEW_NEWMV, { LAST3_FRAME, ALTREF_FRAME } },
  { ZERO_ZEROMV, { LAST3_FRAME, ALTREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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  { NEAR_NEARESTMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { NEAREST_NEARMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { NEAR_NEARMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { NEW_NEARESTMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { NEAREST_NEWMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { NEW_NEARMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { NEAR_NEWMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { NEW_NEWMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { ZERO_ZEROMV, { GOLDEN_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { NEAR_NEARESTMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEAREST_NEARMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEAR_NEARMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEW_NEARESTMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEAREST_NEWMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEW_NEARMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEAR_NEWMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEW_NEWMV, { LAST_FRAME, BWDREF_FRAME } },
  { ZERO_ZEROMV, { LAST_FRAME, BWDREF_FRAME } },

  { NEAR_NEARESTMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEAREST_NEARMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEAR_NEARMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEW_NEARESTMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEAREST_NEWMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEW_NEARMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEAR_NEWMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEW_NEWMV, { LAST2_FRAME, BWDREF_FRAME } },
  { ZERO_ZEROMV, { LAST2_FRAME, BWDREF_FRAME } },

  { NEAR_NEARESTMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEAREST_NEARMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEAR_NEARMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEW_NEARESTMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEAREST_NEWMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEW_NEARMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEAR_NEWMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEW_NEWMV, { LAST3_FRAME, BWDREF_FRAME } },
  { ZERO_ZEROMV, { LAST3_FRAME, BWDREF_FRAME } },

  { NEAR_NEARESTMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { NEAREST_NEARMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { NEAR_NEARMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { NEW_NEARESTMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { NEAREST_NEWMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { NEW_NEARMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { NEAR_NEWMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { NEW_NEWMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { ZERO_ZEROMV, { GOLDEN_FRAME, BWDREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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#else  // CONFIG_EXT_INTER

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  { NEARMV, { LAST_FRAME, ALTREF_FRAME } },
  { NEWMV, { LAST_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { NEARMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEWMV, { LAST2_FRAME, ALTREF_FRAME } },
  { NEARMV, { LAST3_FRAME, ALTREF_FRAME } },
  { NEWMV, { LAST3_FRAME, ALTREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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  { NEARMV, { GOLDEN_FRAME, ALTREF_FRAME } },
  { NEWMV, { GOLDEN_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { NEARMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEWMV, { LAST_FRAME, BWDREF_FRAME } },
  { NEARMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEWMV, { LAST2_FRAME, BWDREF_FRAME } },
  { NEARMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEWMV, { LAST3_FRAME, BWDREF_FRAME } },
  { NEARMV, { GOLDEN_FRAME, BWDREF_FRAME } },
  { NEWMV, { GOLDEN_FRAME, BWDREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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  { ZEROMV, { LAST_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { ZEROMV, { LAST2_FRAME, ALTREF_FRAME } },
  { ZEROMV, { LAST3_FRAME, ALTREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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  { ZEROMV, { GOLDEN_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { ZEROMV, { LAST_FRAME, BWDREF_FRAME } },
  { ZEROMV, { LAST2_FRAME, BWDREF_FRAME } },
  { ZEROMV, { LAST3_FRAME, BWDREF_FRAME } },
  { ZEROMV, { GOLDEN_FRAME, BWDREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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#endif  // CONFIG_EXT_INTER
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  { H_PRED, { INTRA_FRAME, NONE } },
  { V_PRED, { INTRA_FRAME, NONE } },
  { D135_PRED, { INTRA_FRAME, NONE } },
  { D207_PRED, { INTRA_FRAME, NONE } },
  { D153_PRED, { INTRA_FRAME, NONE } },
  { D63_PRED, { INTRA_FRAME, NONE } },
  { D117_PRED, { INTRA_FRAME, NONE } },
  { D45_PRED, { INTRA_FRAME, NONE } },
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#if CONFIG_EXT_INTER
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  { ZEROMV, { LAST_FRAME, INTRA_FRAME } },
  { NEARESTMV, { LAST_FRAME, INTRA_FRAME } },
  { NEARMV, { LAST_FRAME, INTRA_FRAME } },
  { NEWMV, { LAST_FRAME, INTRA_FRAME } },
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#if CONFIG_EXT_REFS
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  { ZEROMV, { LAST2_FRAME, INTRA_FRAME } },
  { NEARESTMV, { LAST2_FRAME, INTRA_FRAME } },
  { NEARMV, { LAST2_FRAME, INTRA_FRAME } },
  { NEWMV, { LAST2_FRAME, INTRA_FRAME } },

  { ZEROMV, { LAST3_FRAME, INTRA_FRAME } },
  { NEARESTMV, { LAST3_FRAME, INTRA_FRAME } },
  { NEARMV, { LAST3_FRAME, INTRA_FRAME } },
  { NEWMV, { LAST3_FRAME, INTRA_FRAME } },
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#endif  // CONFIG_EXT_REFS

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  { ZEROMV, { GOLDEN_FRAME, INTRA_FRAME } },
  { NEARESTMV, { GOLDEN_FRAME, INTRA_FRAME } },
  { NEARMV, { GOLDEN_FRAME, INTRA_FRAME } },
  { NEWMV, { GOLDEN_FRAME, INTRA_FRAME } },
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#if CONFIG_EXT_REFS
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  { ZEROMV, { BWDREF_FRAME, INTRA_FRAME } },
  { NEARESTMV, { BWDREF_FRAME, INTRA_FRAME } },
  { NEARMV, { BWDREF_FRAME, INTRA_FRAME } },
  { NEWMV, { BWDREF_FRAME, INTRA_FRAME } },
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#endif  // CONFIG_EXT_REFS

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  { ZEROMV, { ALTREF_FRAME, INTRA_FRAME } },
  { NEARESTMV, { ALTREF_FRAME, INTRA_FRAME } },
  { NEARMV, { ALTREF_FRAME, INTRA_FRAME } },
  { NEWMV, { ALTREF_FRAME, INTRA_FRAME } },
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#endif  // CONFIG_EXT_INTER
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};

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static const REF_DEFINITION av1_ref_order[MAX_REFS] = {
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  { { LAST_FRAME, NONE } },
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#if CONFIG_EXT_REFS
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  { { LAST2_FRAME, NONE } },          { { LAST3_FRAME, NONE } },
  { { BWDREF_FRAME, NONE } },
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#endif  // CONFIG_EXT_REFS
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  { { GOLDEN_FRAME, NONE } },         { { ALTREF_FRAME, NONE } },
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  { { LAST_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { { LAST2_FRAME, ALTREF_FRAME } },  { { LAST3_FRAME, ALTREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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  { { GOLDEN_FRAME, ALTREF_FRAME } },
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#if CONFIG_EXT_REFS
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  { { LAST_FRAME, BWDREF_FRAME } },   { { LAST2_FRAME, BWDREF_FRAME } },
  { { LAST3_FRAME, BWDREF_FRAME } },  { { GOLDEN_FRAME, BWDREF_FRAME } },
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#endif  // CONFIG_EXT_REFS
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  { { INTRA_FRAME, NONE } },
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};

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#if CONFIG_EXT_INTRA || CONFIG_FILTER_INTRA || CONFIG_PALETTE
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static INLINE int write_uniform_cost(int n, int v) {
  int l = get_unsigned_bits(n), m = (1 << l) - n;
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  if (l == 0) return 0;
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  if (v < m)
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    return (l - 1) * av1_cost_bit(128, 0);
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  else
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    return l * av1_cost_bit(128, 0);
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}
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#endif  // CONFIG_EXT_INTRA || CONFIG_FILTER_INTRA || CONFIG_PALETTE
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// constants for prune 1 and prune 2 decision boundaries
#define FAST_EXT_TX_CORR_MID 0.0
#define FAST_EXT_TX_EDST_MID 0.1
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#define FAST_EXT_TX_CORR_MARGIN 0.5
#define FAST_EXT_TX_EDST_MARGIN 0.3

static const TX_TYPE_1D vtx_tab[TX_TYPES] = {
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  DCT_1D,      ADST_1D, DCT_1D,      ADST_1D,
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#if CONFIG_EXT_TX
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  FLIPADST_1D, DCT_1D,  FLIPADST_1D, ADST_1D, FLIPADST_1D, IDTX_1D,
  DCT_1D,      IDTX_1D, ADST_1D,     IDTX_1D, FLIPADST_1D, IDTX_1D,
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#endif  // CONFIG_EXT_TX
};

static const TX_TYPE_1D htx_tab[TX_TYPES] = {
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  DCT_1D,  DCT_1D,      ADST_1D,     ADST_1D,
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  DCT_1D,  FLIPADST_1D, FLIPADST_1D, FLIPADST_1D, ADST_1D, IDTX_1D,
  IDTX_1D, DCT_1D,      IDTX_1D,     ADST_1D,     IDTX_1D, FLIPADST_1D,
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#endif  // CONFIG_EXT_TX
};
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#if CONFIG_DAALA_DIST
static int od_compute_var_4x4(od_coeff *x, int stride) {
  int sum;
  int s2;
  int i;
  sum = 0;
  s2 = 0;
  for (i = 0; i < 4; i++) {
    int j;
    for (j = 0; j < 4; j++) {
      int t;

      t = x[i * stride + j];
      sum += t;
      s2 += t * t;
    }
  }
  // TODO(yushin) : Check wheter any changes are required for high bit depth.
  return (s2 - (sum * sum >> 4)) >> 4;
}

static double od_compute_dist_8x8(int qm, int use_activity_masking, od_coeff *x,
                                  od_coeff *y, int stride) {
  od_coeff e[8 * 8];
  od_coeff et[8 * 8];
  int16_t src[8 * 8];
  tran_low_t coeff[8 * 8];
  double sum;
  int min_var;
  double mean_var;
  double var_stat;
  double activity;
  double calibration;
  int i;
  int j;
  double vardist;
  FWD_TXFM_PARAM fwd_txfm_param;

  vardist = 0;
  OD_ASSERT(qm != OD_FLAT_QM);
#if 1
  min_var = INT_MAX;
  mean_var = 0;
  for (i = 0; i < 3; i++) {
    for (j = 0; j < 3; j++) {
      int varx;
      int vary;
      varx = od_compute_var_4x4(x + 2 * i * stride + 2 * j, stride);
      vary = od_compute_var_4x4(y + 2 * i * stride + 2 * j, stride);
      min_var = OD_MINI(min_var, varx);
      mean_var += 1. / (1 + varx);
      /* The cast to (double) is to avoid an overflow before the sqrt.*/
      vardist += varx - 2 * sqrt(varx * (double)vary) + vary;
    }
  }
  /* We use a different variance statistic depending on whether activity
     masking is used, since the harmonic mean appeared slghtly worse with
     masking off. The calibration constant just ensures that we preserve the
     rate compared to activity=1. */
  if (use_activity_masking) {
    calibration = 1.95;
    var_stat = 9. / mean_var;
  } else {
    calibration = 1.62;
    var_stat = min_var;
  }
  /* 1.62 is a calibration constant, 0.25 is a noise floor and 1/6 is the
     activity masking constant. */
  activity = calibration * pow(.25 + var_stat, -1. / 6);
#else
  activity = 1;
#endif
  sum = 0;
  for (i = 0; i < 8; i++) {
    for (j = 0; j < 8; j++)
      e[8 * i + j] = x[i * stride + j] - y[i * stride + j];
  }

  for (i = 0; i < 8; i++)
    for (j = 0; j < 8; j++) src[8 * i + j] = e[8 * i + j];

  fwd_txfm_param.tx_type = DCT_DCT;
  fwd_txfm_param.tx_size = TX_8X8;
  fwd_txfm_param.lossless = 0;

  fwd_txfm(&src[0], &coeff[0], 8, &fwd_txfm_param);

  for (i = 0; i < 8; i++)
    for (j = 0; j < 8; j++) et[8 * i + j] = coeff[8 * i + j] >> 3;

  sum = 0;
  for (i = 0; i < 8; i++)
    for (j = 0; j < 8; j++)
      sum += et[8 * i + j] * (double)et[8 * i + j] * 16. /
             OD_QM8_Q4_HVS[i * 8 + j];

  return activity * activity * (sum + vardist);
}

// Note : Inputs x and y are in a pixel domain
static double od_compute_dist(int qm, int activity_masking, od_coeff *x,
                              od_coeff *y, int bsize_w, int bsize_h,
                              int qindex) {
  int i;
  double sum;
  sum = 0;

  (void)qindex;

  assert(bsize_w >= 8 && bsize_h >= 8);

  if (qm == OD_FLAT_QM) {
    for (i = 0; i < bsize_w * bsize_h; i++) {
      double tmp;
      tmp = x[i] - y[i];
      sum += tmp * tmp;
    }
  } else {
    for (i = 0; i < bsize_h; i += 8) {
      int j;
      for (j = 0; j < bsize_w; j += 8) {
        sum += od_compute_dist_8x8(qm, activity_masking, &x[i * bsize_w + j],
                                   &y[i * bsize_w + j], bsize_w);
      }
    }
    /* Compensate for the fact that the quantization matrix lowers the
       distortion value. We tried a half-dozen values and picked the one where
       we liked the ntt-short1 curves best. The tuning is approximate since
       the different metrics go in different directions. */
    /*Start interpolation at coded_quantizer 1.7=f(36) and end it at 1.2=f(47)*/
    // TODO(yushin): Check whether qindex of AV1 work here, replacing daala's
    // coded_quantizer.
    /*sum *= qindex >= 47 ? 1.2 :
        qindex <= 36 ? 1.7 :
     1.7 + (1.2 - 1.7)*(qindex - 36)/(47 - 36);*/
  }
  return sum;
}

static int64_t av1_daala_dist(const uint8_t *src, int src_stride,
                              const uint8_t *dst, int dst_stride, int tx_size,
                              int qm, int use_activity_masking, int qindex) {
  int i, j;
  int64_t d;
  const BLOCK_SIZE tx_bsize = txsize_to_bsize[tx_size];
  const int bsw = block_size_wide[tx_bsize];
  const int bsh = block_size_high[tx_bsize];
  DECLARE_ALIGNED(16, od_coeff, orig[MAX_TX_SQUARE]);
  DECLARE_ALIGNED(16, od_coeff, rec[MAX_TX_SQUARE]);

  assert(qm == OD_HVS_QM);

  for (j = 0; j < bsh; j++)
    for (i = 0; i < bsw; i++) orig[j * bsw + i] = src[j * src_stride + i];

  for (j = 0; j < bsh; j++)
    for (i = 0; i < bsw; i++) rec[j * bsw + i] = dst[j * dst_stride + i];

  d = (int64_t)od_compute_dist(qm, use_activity_masking, orig, rec, bsw, bsh,
                               qindex);
  return d;
}
#endif  // #if CONFIG_DAALA_DIST

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static void get_energy_distribution_fine(const AV1_COMP *cpi, BLOCK_SIZE bsize,
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                                         uint8_t *src, int src_stride,
                                         uint8_t *dst, int dst_stride,
                                         double *hordist, double *verdist) {
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  int bw = block_size_wide[bsize];
  int bh = block_size_high[bsize];
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  unsigned int esq[16] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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  unsigned int var[16];
  double total = 0;
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  const int f_index = bsize - BLOCK_16X16;
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  if (f_index < 0) {
    int i, j, index;
    int w_shift = bw == 8 ? 1 : 2;
    int h_shift = bh == 8 ? 1 : 2;
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#if CONFIG_AOM_HIGHBITDEPTH
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    if (cpi->common.use_highbitdepth) {
      uint16_t *src16 = CONVERT_TO_SHORTPTR(src);
      uint16_t *dst16 = CONVERT_TO_SHORTPTR(dst);
      for (i = 0; i < bh; ++i)
        for (j = 0; j < bw; ++j) {
          index = (j >> w_shift) + ((i >> h_shift) << 2);
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          esq[index] +=
              (src16[j + i * src_stride] - dst16[j + i * dst_stride]) *
              (src16[j + i * src_stride] - dst16[j + i * dst_stride]);
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        }
    } else {
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#endif  // CONFIG_AOM_HIGHBITDEPTH
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      for (i = 0; i < bh; ++i)
        for (j = 0; j < bw; ++j) {
          index = (j >> w_shift) + ((i >> h_shift) << 2);
          esq[index] += (src[j + i * src_stride] - dst[j + i * dst_stride]) *
                        (src[j + i * src_stride] - dst[j + i * dst_stride]);
        }
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#if CONFIG_AOM_HIGHBITDEPTH
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    }
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#endif  // CONFIG_AOM_HIGHBITDEPTH
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  } else {
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    var[0] = cpi->fn_ptr[f_index].vf(src, src_stride, dst, dst_stride, &esq[0]);
    var[1] = cpi->fn_ptr[f_index].vf(src + bw / 4, src_stride, dst + bw / 4,
                                     dst_stride, &esq[1]);
    var[2] = cpi->fn_ptr[f_index].vf(src + bw / 2, src_stride, dst + bw / 2,
                                     dst_stride, &esq[2]);
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    var[3] = cpi->fn_ptr[f_index].vf(src + 3 * bw / 4, src_stride,
                                     dst + 3 * bw / 4, dst_stride, &esq[3]);
    src += bh / 4 * src_stride;
    dst += bh / 4 * dst_stride;

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    var[4] = cpi->fn_ptr[f_index].vf(src, src_stride, dst, dst_stride, &esq[4]);
    var[5] = cpi->fn_ptr[f_index].vf(src + bw / 4, src_stride, dst + bw / 4,
                                     dst_stride, &esq[5]);
    var[6] = cpi->fn_ptr[f_index].vf(src + bw / 2, src_stride, dst + bw / 2,
                                     dst_stride, &esq[6]);
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    var[7] = cpi->fn_ptr[f_index].vf(src + 3 * bw / 4, src_stride,
                                     dst + 3 * bw / 4, dst_stride, &esq[7]);
    src += bh / 4 * src_stride;
    dst += bh / 4 * dst_stride;

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    var[8] = cpi->fn_ptr[f_index].vf(src, src_stride, dst, dst_stride, &esq[8]);
    var[9] = cpi->fn_ptr[f_index].vf(src + bw / 4, src_stride, dst + bw / 4,
                                     dst_stride, &esq[9]);
    var[10] = cpi->fn_ptr[f_index].vf(src + bw / 2, src_stride, dst + bw / 2,
                                      dst_stride, &esq[10]);
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    var[11] = cpi->fn_ptr[f_index].vf(src + 3 * bw / 4, src_stride,
                                      dst + 3 * bw / 4, dst_stride, &esq[11]);
    src += bh / 4 * src_stride;
    dst += bh / 4 * dst_stride;

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    var[12] =
        cpi->fn_ptr[f_index].vf(src, src_stride, dst, dst_stride, &esq[12]);
    var[13] = cpi->fn_ptr[f_index].vf(src + bw / 4, src_stride, dst + bw / 4,
                                      dst_stride, &esq[13]);
    var[14] = cpi->fn_ptr[f_index].vf(src + bw / 2, src_stride, dst + bw / 2,
                                      dst_stride, &esq[14]);
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    var[15] = cpi->fn_ptr[f_index].vf(src + 3 * bw / 4, src_stride,
                                      dst + 3 * bw / 4, dst_stride, &esq[15]);
  }

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  total = esq[0] + esq[1] + esq[2] + esq[3] + esq[4] + esq[5] + esq[6] +
          esq[7] + esq[8] + esq[9] + esq[10] + esq[11] + esq[12] + esq[13] +
          esq[14] + esq[15];
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  if (total > 0) {
    const double e_recip = 1.0 / total;
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    hordist[0] =
        ((double)esq[0] + (double)esq[4] + (double)esq[8] + (double)esq[12]) *
        e_recip;
    hordist[1] =
        ((double)esq[1] + (double)esq[5] + (double)esq[9] + (double)esq[13]) *
        e_recip;
    hordist[2] =
        ((double)esq[2] + (double)esq[6] + (double)esq[10] + (double)esq[14]) *
        e_recip;
    verdist[0] =
        ((double)esq[0] + (double)esq[1] + (double)esq[2] + (double)esq[3]) *
        e_recip;
    verdist[1] =
        ((double)esq[4] + (double)esq[5] + (double)esq[6] + (double)esq[7]) *
        e_recip;
    verdist[2] =
        ((double)esq[8] + (double)esq[9] + (double)esq[10] + (double)esq[11]) *
        e_recip;
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  } else {
    hordist[0] = verdist[0] = 0.25;
    hordist[1] = verdist[1] = 0.25;
    hordist[2] = verdist[2] = 0.25;
  }
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  (void)var[0];
  (void)var[1];
  (void)var[2];
  (void)var[3];
  (void)var[4];
  (void)var[5];
  (void)var[6];
  (void)var[7];
  (void)var[8];
  (void)var[9];
  (void)var[10];
  (void)var[11];
  (void)var[12];
  (void)var[13];
  (void)var[14];
  (void)var[15];
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}

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static int adst_vs_flipadst(const AV1_COMP *cpi, BLOCK_SIZE bsize, uint8_t *src,
                            int src_stride, uint8_t *dst, int dst_stride,
                            double *hdist, double *vdist) {
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  int prune_bitmask = 0;
  double svm_proj_h = 0, svm_proj_v = 0;
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  get_energy_distribution_fine(cpi, bsize, src, src_stride, dst, dst_stride,
                               hdist, vdist);
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  svm_proj_v = vdist[0] * ADST_FLIP_SVM[0] + vdist[1] * ADST_FLIP_SVM[1] +
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               vdist[2] * ADST_FLIP_SVM[2] + ADST_FLIP_SVM[3];
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  svm_proj_h = hdist[0] * ADST_FLIP_SVM[4] + hdist[1] * ADST_FLIP_SVM[5] +
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               hdist[2] * ADST_FLIP_SVM[6] + ADST_FLIP_SVM[7];
  if (svm_proj_v > FAST_EXT_TX_EDST_MID + FAST_EXT_TX_EDST_MARGIN)
    prune_bitmask |= 1 << FLIPADST_1D;
  else if (svm_proj_v < FAST_EXT_TX_EDST_MID - FAST_EXT_TX_EDST_MARGIN)
    prune_bitmask |= 1 << ADST_1D;

  if (svm_proj_h > FAST_EXT_TX_EDST_MID + FAST_EXT_TX_EDST_MARGIN)
    prune_bitmask |= 1 << (FLIPADST_1D + 8);
  else if (svm_proj_h < FAST_EXT_TX_EDST_MID - FAST_EXT_TX_EDST_MARGIN)
    prune_bitmask |= 1 << (ADST_1D + 8);

  return prune_bitmask;
}

#if CONFIG_EXT_TX
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static void get_horver_correlation(int16_t *diff, int stride, int w, int h,
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                                   double *hcorr, double *vcorr) {
  // Returns hor/ver correlation coefficient
  const int num = (h - 1) * (w - 1);
  double num_r;
  int i, j;
  int64_t xy_sum = 0, xz_sum = 0;
  int64_t x_sum = 0, y_sum = 0, z_sum = 0;
  int64_t x2_sum = 0, y2_sum = 0, z2_sum = 0;
  double x_var_n, y_var_n, z_var_n, xy_var_n, xz_var_n;
  *hcorr = *vcorr = 1;

  assert(num > 0);
  num_r = 1.0 / num;
  for (i = 1; i < h; ++i) {
    for (j = 1; j < w; ++j) {
      const int16_t x = diff[i * stride + j];
      const int16_t y = diff[i * stride + j - 1];
      const int16_t z = diff[(i - 1) * stride + j];
      xy_sum += x * y;
      xz_sum += x * z;
      x_sum += x;
      y_sum += y;
      z_sum += z;
      x2_sum += x * x;
      y2_sum += y * y;
      z2_sum += z * z;
    }
  }
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  x_var_n = x2_sum - (x_sum * x_sum) * num_r;
  y_var_n = y2_sum - (y_sum * y_sum) * num_r;
  z_var_n = z2_sum - (z_sum * z_sum) * num_r;
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  xy_var_n = xy_sum - (x_sum * y_sum) * num_r;
  xz_var_n = xz_sum - (x_sum * z_sum) * num_r;
  if (x_var_n > 0 && y_var_n > 0) {
    *hcorr = xy_var_n / sqrt(x_var_n * y_var_n);
    *hcorr = *hcorr < 0 ? 0 : *hcorr;
  }
  if (x_var_n > 0 && z_var_n > 0) {
    *vcorr = xz_var_n / sqrt(x_var_n * z_var_n);
    *vcorr = *vcorr < 0 ? 0 : *vcorr;
  }
}

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int dct_vs_idtx(int16_t *diff, int stride, int w, int h, double *hcorr,
                double *vcorr) {
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  int prune_bitmask = 0;
  get_horver_correlation(diff, stride, w, h, hcorr, vcorr);

  if (*vcorr > FAST_EXT_TX_CORR_MID + FAST_EXT_TX_CORR_MARGIN)
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    prune_bitmask |= 1 << IDTX_1D;
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  else if (*vcorr < FAST_EXT_TX_CORR_MID - FAST_EXT_TX_CORR_MARGIN)
    prune_bitmask |= 1 << DCT_1D;

  if (*hcorr > FAST_EXT_TX_CORR_MID + FAST_EXT_TX_CORR_MARGIN)
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    prune_bitmask |= 1 << (IDTX_1D + 8);
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  else if (*hcorr < FAST_EXT_TX_CORR_MID - FAST_EXT_TX_CORR_MARGIN)
    prune_bitmask |= 1 << (DCT_1D + 8);
  return prune_bitmask;
}

// Performance drop: 0.5%, Speed improvement: 24%
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static int prune_two_for_sby(const AV1_COMP *cpi, BLOCK_SIZE bsize,
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                             MACROBLOCK *x, MACROBLOCKD *xd, int adst_flipadst,
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                             int dct_idtx) {
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  struct macroblock_plane *const p = &x->plane[0];
  struct macroblockd_plane *const pd = &xd->plane[0];
  const BLOCK_SIZE bs = get_plane_block_size(bsize, pd);
  const int bw = 4 << (b_width_log2_lookup[bs]);
  const int bh = 4 << (b_height_log2_lookup[bs]);
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  double hdist[3] = { 0, 0, 0 }, vdist[3] = { 0, 0, 0 };
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  double hcorr, vcorr;
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  int prune = 0;
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  av1_subtract_plane(x, bsize, 0);
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  if (adst_flipadst)
    prune |= adst_vs_flipadst(cpi, bsize, p->src.buf, p->src.stride,
                              pd->dst.buf, pd->dst.stride, hdist, vdist);
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  if (dct_idtx) prune |= dct_vs_idtx(p->src_diff, bw, bw, bh, &hcorr, &vcorr);
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  return prune;
}
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#endif  // CONFIG_EXT_TX

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// Performance drop: 0.3%, Speed improvement: 5%
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static int prune_one_for_sby(const AV1_COMP *cpi, BLOCK_SIZE bsize,
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                             MACROBLOCK *x, MACROBLOCKD *xd) {
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  struct macroblock_plane *const p = &x->plane[0];
  struct macroblockd_plane *const pd = &xd->plane[0];
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  double hdist[3] = { 0, 0, 0 }, vdist[3] = { 0, 0, 0 };
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  av1_subtract_plane(x, bsize, 0);
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  return adst_vs_flipadst(cpi, bsize, p->src.buf, p->src.stride, pd->dst.buf,
                          pd->dst.stride, hdist, vdist);
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}

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static int prune_tx_types(const AV1_COMP *cpi, BLOCK_SIZE bsize, MACROBLOCK *x,
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                          MACROBLOCKD *xd, int tx_set) {
#if CONFIG_EXT_TX
  const int *tx_set_1D = ext_tx_used_inter_1D[tx_set];
#else
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  const int tx_set_1D[TX_TYPES_1D] = { 0 };
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#endif

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  switch (cpi->sf.tx_type_search.prune_mode) {
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    case NO_PRUNE: return 0; break;
    case PRUNE_ONE:
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      if ((tx_set >= 0) && !(tx_set_1D[FLIPADST_1D] & tx_set_1D[ADST_1D]))
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        return 0;
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      return prune_one_for_sby(cpi, bsize, x, xd);
      break;
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#if CONFIG_EXT_TX
    case PRUNE_TWO:
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      if ((tx_set >= 0) && !(tx_set_1D[FLIPADST_1D] & tx_set_1D[ADST_1D])) {
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        if (!(tx_set_1D[DCT_1D] & tx_set_1D[IDTX_1D])) return 0;
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        return prune_two_for_sby(cpi, bsize, x, xd, 0, 1);
      }
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      if ((tx_set >= 0) && !(tx_set_1D[DCT_1D] & tx_set_1D[IDTX_1D]))
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        return prune_two_for_sby(cpi, bsize, x, xd, 1, 0);
      return prune_two_for_sby(cpi, bsize, x, xd, 1, 1);
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      break;
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#endif
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  }
  assert(0);
  return 0;
}

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static int do_tx_type_search(TX_TYPE tx_type, int prune) {
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// TODO(sarahparker) implement for non ext tx
#if CONFIG_EXT_TX
  return !(((prune >> vtx_tab[tx_type]) & 1) |
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           ((prune >> (htx_tab[tx_type] + 8)) & 1));
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#else
  // temporary to avoid compiler warnings
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  (void)vtx_tab;
  (void)htx_tab;
  (void)tx_type;
  (void)prune;
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  return 1;
#endif
}

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static void model_rd_from_sse(const AV1_COMP *const cpi,
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                              const MACROBLOCKD *const xd, BLOCK_SIZE bsize,
                              int plane, int64_t sse, int *rate,
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                              int64_t *dist) {
  const struct macroblockd_plane *const pd = &xd->plane[plane];
  const int dequant_shift =
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#if CONFIG_AOM_HIGHBITDEPTH
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      (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) ? xd->bd - 5 :
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#endif  // CONFIG_AOM_HIGHBITDEPTH
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                                                    3;
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  // Fast approximate the modelling function.
  if (cpi->sf.simple_model_rd_from_var) {
    const int64_t square_error = sse;
    int quantizer = (pd->dequant[1] >> dequant_shift);

    if (quantizer < 120)
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      *rate = (int)((square_error * (280 - quantizer)) >>
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                    (16 - AV1_PROB_COST_SHIFT));
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    else
      *rate = 0;
    *dist = (square_error * quantizer) >> 8;
  } else {
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    av1_model_rd_from_var_lapndz(sse, num_pels_log2_lookup[bsize],
                                 pd->dequant[1] >> dequant_shift, rate, dist);
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  }

  *dist <<= 4;
}

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static void model_rd_for_sb(const AV1_COMP *const cpi, BLOCK_SIZE bsize,
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                            MACROBLOCK *x, MACROBLOCKD *xd, int plane_from,
                            int plane_to, int *out_rate_sum,
                            int64_t *out_dist_sum, int *skip_txfm_sb,
                            int64_t *skip_sse_sb) {
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  // Note our transform coeffs are 8 times an orthogonal transform.
  // Hence quantizer step is also 8 times. To get effective quantizer
  // we need to divide by 8 before sending to modeling function.
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  int plane;
  const int ref = xd->mi[0]->mbmi.ref_frame[0];

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  int64_t rate_sum = 0;
  int64_t dist_sum = 0;
  int64_t total_sse = 0;

  x->pred_sse[ref] = 0;

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  for (plane = plane_from; plane <= plane_to; ++plane) {
    struct macroblock_plane *const p = &x->plane[plane];
    struct macroblockd_plane *const pd = &xd->plane[plane];
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    const BLOCK_SIZE bs = get_plane_block_size(bsize, pd);

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    unsigned int sse;
    int rate;
    int64_t dist;
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    // TODO(geza): Write direct sse functions that do not compute
    // variance as well.
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    cpi->fn_ptr[bs].vf(p->src.buf, p->src.stride, pd->dst.buf, pd->dst.stride,
                       &sse);
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    if (plane == 0) x->pred_sse[ref] = sse;
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    total_sse += sse;
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    model_rd_from_sse(cpi, xd, bs, plane, sse, &rate, &dist);
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    rate_sum += rate;
    dist_sum += dist;
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  }

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  *skip_txfm_sb = total_sse == 0;
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  *skip_sse_sb = total_sse << 4;
  *out_rate_sum = (int)rate_sum;
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  *out_dist_sum = dist_sum;
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}

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#if CONFIG_PVQ
// Without PVQ, av1_block_error_c() return two kind of errors,
// 1) reconstruction (i.e. decoded) error and
// 2) Squared sum of transformed residue (i.e. 'coeff')
// However, if PVQ is enabled, coeff does not keep the transformed residue
// but instead a transformed original is kept.
// Hence, new parameter ref vector (i.e. transformed predicted signal)
// is required to derive the residue signal,
// i.e. coeff - ref = residue (all transformed).

// TODO(yushin) : Since 4x4 case does not need ssz, better to refactor into
// a separate function that does not do the extra computations for ssz.
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static int64_t av1_block_error2_c(const tran_low_t *coeff,
                                  const tran_low_t *dqcoeff,
                                  const tran_low_t *ref, intptr_t block_size,
                                  int64_t *ssz) {
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  int64_t error;

  // Use the existing sse codes for calculating distortion of decoded signal:
  // i.e. (orig - decoded)^2
  error = av1_block_error_fp(coeff, dqcoeff, block_size);
  // prediction residue^2 = (orig - ref)^2
  *ssz = av1_block_error_fp(coeff, ref, block_size);

  return error;
}
#endif

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int64_t av1_block_error_c(const tran_low_t *coeff, const tran_low_t *dqcoeff,
                          intptr_t block_size, int64_t *ssz) {
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  int i;
  int64_t error = 0, sqcoeff = 0;

  for (i = 0; i < block_size; i++) {
    const int diff = coeff[i] - dqcoeff[i];
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    error += diff * diff;
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    sqcoeff += coeff[i] * coeff[i];
  }

  *ssz = sqcoeff;
  return error;
}

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int64_t av1_block_error_fp_c(const int16_t *coeff, const int16_t *dqcoeff,
                             int block_size) {
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  int i;
  int64_t error = 0;

  for (i = 0; i < block_size; i++) {
    const int diff = coeff[i] - dqcoeff[i];
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    error += diff * diff;
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  }

  return error;
}

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#if CONFIG_AOM_HIGHBITDEPTH
int64_t av1_highbd_block_error_c(const tran_low_t *coeff,
                                 const tran_low_t *dqcoeff, intptr_t block_size,
                                 int64_t *ssz, int bd) {
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  int i;
  int64_t error = 0, sqcoeff = 0;
  int shift = 2 * (bd - 8);
  int rounding = shift > 0 ? 1 << (shift - 1) : 0;

  for (i = 0; i < block_size; i++) {
    const int64_t diff = coeff[i] - dqcoeff[i];
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    error += diff * diff;
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    sqcoeff += (int64_t)coeff[i] * (int64_t)coeff[i];
  }
  assert(error >= 0 && sqcoeff >= 0);
  error = (error + rounding) >> shift;
  sqcoeff = (sqcoeff + rounding) >> shift;

  *ssz = sqcoeff;
  return error;
}
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#endif  // CONFIG_AOM_HIGHBITDEPTH
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#if !CONFIG_PVQ
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/* The trailing '0' is a terminator which is used inside av1_cost_coeffs() to
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 * decide whether to include cost of a trailing EOB node or not (i.e. we
 * can skip this if the last coefficient in this transform block, e.g. the
 * 16th coefficient in a 4x4 block or the 64th coefficient in a 8x8 block,
 * were non-zero). */
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int av1_cost_coeffs(const AV1_COMMON *const cm, MACROBLOCK *x, int plane,
                    int block, int coeff_ctx, TX_SIZE tx_size,
                    const int16_t *scan, const int16_t *nb,
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                    int use_fast_coef_costing) {
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  MACROBLOCKD *const xd = &x->e_mbd;
  MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
  const struct macroblock_plane *p = &x->plane[plane];
  const struct macroblockd_plane *pd = &xd->plane[plane];
  const PLANE_TYPE type = pd->plane_type;
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  const uint16_t *band_count = &band_count_table[tx_size][1];
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  const int eob = p->eobs[block];
  const tran_low_t *const qcoeff = BLOCK_OFFSET(p->qcoeff, block);
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  const int tx_size_ctx = txsize_sqr_map[tx_size];
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  unsigned int(*token_costs)[2][COEFF_CONTEXTS][ENTROPY_TOKENS] =
      x->token_costs[tx_size_ctx][type][is_inter_block(mbmi)];
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  uint8_t token_cache[MAX_TX_SQUARE];
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  int pt = coeff_ctx;
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  int c, cost;
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#if CONFIG_AOM_HIGHBITDEPTH
  const int *cat6_high_cost = av1_get_high_cost_table(xd->bd);
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#else
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  const int *cat6_high_cost = av1_get_high_cost_table(8);
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#endif

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#if !CONFIG_VAR_TX && !CONFIG_SUPERTX
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  // Check for consistency of tx_size with mode info
  assert(type == PLANE_TYPE_Y ? mbmi->tx_size == tx_size
                              : get_uv_tx_size(mbmi, pd) == tx_size);
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#endif  // !CONFIG_VAR_TX && !CONFIG_SUPERTX
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  (void)cm;
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  if (eob == 0) {
    // single eob token
    cost = token_costs[0][0][pt][EOB_TOKEN];
  } else {
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    if (use_fast_coef_costing) {
      int band_left = *band_count++;

      // dc token
      int v = qcoeff[0];
      int16_t prev_t;
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      cost = av1_get_token_cost(v, &prev_t, cat6_high_cost);
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      cost += (*token_costs)[0][pt][prev_t];

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      token_cache[0] = av1_pt_energy_class[prev_t];
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      ++token_costs;

      // ac tokens
      for (c = 1; c < eob; c++) {
        const int rc = scan[c];
        int16_t t;

        v = qcoeff[rc];
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        cost += av1_get_token_cost(v, &t, cat6_high_cost);
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        cost += (*token_costs)[!prev_t][!prev_t][t];
        prev_t = t;
        if (!--band_left) {
          band_left = *band_count++;
          ++token_costs;
        }
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      }

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      // eob token
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      if (band_left) cost += (*token_costs)[0][!prev_t][EOB_TOKEN];
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    } else {  // !use_fast_coef_costing
      int band_left = *band_count++;

      // dc token
      int v = qcoeff[0];
      int16_t tok;
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      unsigned int(*tok_cost_ptr)[COEFF_CONTEXTS][ENTROPY_TOKENS];
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      cost = av1_get_token_cost(v, &tok, cat6_high_cost);
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      cost += (*token_costs)[0][pt][tok];

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      token_cache[0] = av1_pt_energy_class[tok];
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      ++token_costs;

      tok_cost_ptr = &((*token_costs)[!tok]);

      // ac tokens
      for (c = 1; c < eob; c++) {
        const int rc = scan[c];

        v = qcoeff[rc];
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        cost += av1_get_token_cost(v, &tok, cat6_high_cost);
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        pt = get_coef_context(nb, token_cache, c);
        cost += (*tok_cost_ptr)[pt][tok];
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        token_cache[rc] = av1_pt_energy_class[tok];
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        if (!--band_left) {
          band_left = *band_count++;
          ++token_costs;
        }
        tok_cost_ptr = &((*token_costs)[!tok]);
      }

      // eob token
      if (band_left) {
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        pt = get_coef_context(nb, token_cache, c);
        cost += (*token_costs)[0][pt][EOB_TOKEN];
      }
    }
  }

  return cost;
}
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#endif
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static void dist_block(const AV1_COMP *cpi, MACROBLOCK *x, int plane, int block,
                       int blk_row, int blk_col, TX_SIZE tx_size,
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                       int64_t *out_dist, int64_t *out_sse) {
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  MACROBLOCKD *const xd = &x->e_mbd;
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  const struct macroblock_plane *const p = &x->plane[plane];
  const struct macroblockd_plane *const pd = &xd->plane[plane];
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#if CONFIG_DAALA_DIST
  int qm = OD_HVS_QM;
  int use_activity_masking = 0;
#if CONFIG_PVQ
  use_activity_masking = x->daala_enc.use_activity_masking;
#endif
#endif

  if (cpi->sf.use_transform_domain_distortion && !CONFIG_DAALA_DIST) {
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    // Transform domain distortion computation is more accurate as it does
    // not involve an inverse transform, but it is less accurate.
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    const int buffer_length = tx_size_2d[tx_size];
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    int64_t this_sse;
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    int shift = (MAX_TX_SCALE - get_tx_scale(tx_size)) * 2;
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    tran_low_t *const coeff = BLOCK_OFFSET(p->coeff, block);
    tran_low_t *const dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
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#if CONFIG_PVQ
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    tran_low_t *ref_coeff = BLOCK_OFFSET(pd->pvq_ref_coeff, block);
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#endif
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#if CONFIG_AOM_HIGHBITDEPTH
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    const int bd = (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) ? xd->bd : 8;
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    *out_dist =
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        av1_highbd_block_error(coeff, dqcoeff, buffer_length, &this_sse, bd) >>
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        shift;
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#elif CONFIG_PVQ
    *out_dist = av1_block_error2_c(coeff, dqcoeff, ref_coeff, buffer_length,
                                   &this_sse) >>
                shift;
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#else
    *out_dist =
        av1_block_error(coeff, dqcoeff, buffer_length, &this_sse) >> shift;
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#endif  // CONFIG_AOM_HIGHBITDEPTH
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    *out_sse = this_sse >> shift;
  } else {
    const BLOCK_SIZE tx_bsize = txsize_to_bsize[tx_size];
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    const int bsw = block_size_wide[tx_bsize];
    const int bsh = block_size_high[tx_bsize];
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    const int src_stride = x->plane[plane].src.stride;
    const int dst_stride = xd->plane[plane].dst.stride;
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    // Scale the transform block index to pixel unit.
    const int src_idx = (blk_row * src_stride + blk_col)
                        << tx_size_wide_log2[0];
    const int dst_idx = (blk_row * dst_stride + blk_col)
                        << tx_size_wide_log2[0];
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    const uint8_t *src = &x->plane[plane].src.buf[src_idx];
    const uint8_t *dst = &xd->plane[plane].dst.buf[dst_idx];
    const tran_low_t *dqcoeff = BLOCK_OFFSET(pd->dqcoeff, block);
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    const uint16_t eob = p->eobs[block];
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    unsigned int tmp;

    assert(cpi != NULL);
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    assert(tx_size_wide_log2[0] == tx_size_high_log2[0]);
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#if CONFIG_DAALA_DIST
    if (plane == 0) {
      if (bsw >= 8 && bsh >= 8)
        tmp = av1_daala_dist(src, src_stride, dst, dst_stride, tx_size, qm,
                             use_activity_masking, x->qindex);
      else
        tmp = 0;
    } else
#endif
      cpi->fn_ptr[tx_bsize].vf(src, src_stride, dst, dst_stride, &tmp);

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    *out_sse = (int64_t)tmp * 16;

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    if (eob) {
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      const MB_MODE_INFO *mbmi = &xd->mi[0]->mbmi;
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#if CONFIG_AOM_HIGHBITDEPTH
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      DECLARE_ALIGNED(16, uint16_t, recon16[MAX_TX_SQUARE]);
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      uint8_t *recon = (uint8_t *)recon16;
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#else
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      DECLARE_ALIGNED(16, uint8_t, recon[MAX_TX_SQUARE]);
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#endif  // CONFIG_AOM_HIGHBITDEPTH
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      const PLANE_TYPE plane_type = plane == 0 ? PLANE_TYPE_Y : PLANE_TYPE_UV;

      INV_TXFM_PARAM inv_txfm_param;
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      const int block_raster_idx =
          av1_block_index_to_raster_order(tx_size, block);
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      inv_txfm_param.tx_type =
          get_tx_type(plane_type, xd, block_raster_idx, tx_size);
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      inv_txfm_param.tx_size = tx_size;
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      inv_txfm_param.eob = eob;
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      inv_txfm_param.lossless = xd->lossless[mbmi->segment_id];

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#if CONFIG_AOM_HIGHBITDEPTH
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      if (xd->cur_buf->flags & YV12_FLAG_HIGHBITDEPTH) {
        recon = CONVERT_TO_BYTEPTR(recon);
        inv_txfm_param.bd = xd->bd;
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        aom_highbd_convolve_copy(dst, dst_stride, recon, MAX_TX_SIZE, NULL, 0,
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                                 NULL, 0, bsw, bsh, xd->bd);
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        highbd_inv_txfm_add(dqcoeff, recon, MAX_TX_SIZE, &inv_txfm_param);
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      } else
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#endif  // CONFIG_AOM_HIGHBITDEPTH
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      {
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#if !CONFIG_PVQ
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        aom_convolve_copy(dst, dst_stride, recon, MAX_TX_SIZE, NULL, 0, NULL, 0,
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                          bsw, bsh);
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#else
        int i, j;

        for (j = 0; j < bsh; j++)
          for (i = 0; i < bsw; i++) recon[j * MAX_TX_SIZE + i] = 0;
#endif
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        inv_txfm_add(dqcoeff, recon, MAX_TX_SIZE, &inv_txfm_param);
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      }
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#if CONFIG_DAALA_DIST
      if (plane == 0) {
        if (bsw >= 8 && bsh >= 8)
          tmp = av1_daala_dist(src, src_stride, recon, MAX_TX_SIZE, tx_size, qm,
                               use_activity_masking, x->qindex);
        else
          tmp = 0;
      } else
#endif
        cpi->fn_ptr[tx_bsize].vf(src, src_stride, recon, MAX_TX_SIZE, &tmp);
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    }
    *out_dist = (int64_t)tmp * 16;
  }
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}

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#if !CONFIG_PVQ
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static int rate_block(int plane, int block, int coeff_ctx, TX_SIZE tx_size,
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                      struct rdcost_block_args *args) {
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  return av1_cost_coeffs(&args->cpi->common, args->x, plane, block, coeff_ctx,
                         tx_size, args->scan_order->scan,
                         args->scan_order->neighbors,
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                         args->use_fast_coef_costing);
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}
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#endif
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static uint64_t sum_squares_2d(const int16_t *diff, int diff_stride,
                               TX_SIZE tx_size) {
  uint64_t sse;
  switch (tx_size) {
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#if CONFIG_CB4X4
    case TX_2X2:
      sse = aom_sum_squares_2d_i16_c(diff, diff_stride, tx_size_wide[tx_size]);
      break;
#endif