/*
 * Copyright (c) 2022, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#ifndef AOM_AV1_ENCODER_NONRD_OPT_H_
#define AOM_AV1_ENCODER_NONRD_OPT_H_

#include "av1/encoder/rdopt_utils.h"
#include "av1/encoder/rdopt.h"

#define RTC_INTER_MODES (4)
#define RTC_INTRA_MODES (4)
#define RTC_MODES (AOMMAX(RTC_INTER_MODES, RTC_INTRA_MODES))
#define CALC_BIASED_RDCOST(rdcost) (7 * (rdcost) >> 3)
#define NUM_COMP_INTER_MODES_RT (6)
#define NUM_INTER_MODES 12
#define CAP_TX_SIZE_FOR_BSIZE_GT32(tx_mode_search_type, bsize) \
  (((tx_mode_search_type) != ONLY_4X4 && (bsize) > BLOCK_32X32) ? true : false)
#define TX_SIZE_FOR_BSIZE_GT32 (TX_16X16)
#define FILTER_SEARCH_SIZE 2
#if !CONFIG_REALTIME_ONLY
#define MOTION_MODE_SEARCH_SIZE 2
#endif

extern int g_pick_inter_mode_cnt;
/*!\cond */
typedef struct {
  uint8_t *data;
  int stride;
  int in_use;
} PRED_BUFFER;

typedef struct {
  PRED_BUFFER *best_pred;
  PREDICTION_MODE best_mode;
  TX_SIZE best_tx_size;
  TX_TYPE tx_type;
  MV_REFERENCE_FRAME best_ref_frame;
  MV_REFERENCE_FRAME best_second_ref_frame;
  uint8_t best_mode_skip_txfm;
  uint8_t best_mode_initial_skip_flag;
  int_interpfilters best_pred_filter;
  MOTION_MODE best_motion_mode;
  WarpedMotionParams wm_params;
  int num_proj_ref;
  PALETTE_MODE_INFO pmi;
  int64_t best_sse;
} BEST_PICKMODE;

typedef struct {
  MV_REFERENCE_FRAME ref_frame;
  PREDICTION_MODE pred_mode;
} REF_MODE;

typedef struct {
  MV_REFERENCE_FRAME ref_frame[2];
  PREDICTION_MODE pred_mode;
} COMP_REF_MODE;

struct estimate_block_intra_args {
  AV1_COMP *cpi;
  MACROBLOCK *x;
  PREDICTION_MODE mode;
  int skippable;
  RD_STATS *rdc;
  unsigned int best_sad;
  bool prune_mode_based_on_sad;
};
/*!\endcond */

/*!\brief Structure to store parameters and statistics used in non-rd inter mode
 * evaluation.
 */
typedef struct {
  //! Structure to hold best inter mode data
  BEST_PICKMODE best_pickmode;
  //! Structure to RD cost of current mode
  RD_STATS this_rdc;
  //! Pointer to the RD Cost for the best mode found so far
  RD_STATS best_rdc;
  //! Distortion of chroma planes for all modes and reference frames
  int64_t uv_dist[RTC_INTER_MODES][REF_FRAMES];
  //! Buffer to hold predicted block for all reference frames and planes
  struct buf_2d yv12_mb[REF_FRAMES][MAX_MB_PLANE];
  //! Array to hold variance of all modes and reference frames
  unsigned int vars[RTC_INTER_MODES][REF_FRAMES];
  //! Array to hold ref cost of single reference mode for all ref frames
  unsigned int ref_costs_single[REF_FRAMES];
  //! Array to hold motion vector for all modes and reference frames
  int_mv frame_mv[MB_MODE_COUNT][REF_FRAMES];
  //! Array to hold best mv for all modes and reference frames
  int_mv frame_mv_best[MB_MODE_COUNT][REF_FRAMES];
  //! Array to hold inter mode cost of single ref mode for all ref frames
  int single_inter_mode_costs[RTC_INTER_MODES][REF_FRAMES];
  //! Array to hold use reference frame mask for each reference frame
  int use_ref_frame_mask[REF_FRAMES];
  //! Array to hold flags of evaluated modes for each reference frame
  uint8_t mode_checked[MB_MODE_COUNT][REF_FRAMES];
} InterModeSearchStateNonrd;

static const uint8_t b_width_log2_lookup[BLOCK_SIZES] = { 0, 0, 1, 1, 1, 2,
                                                          2, 2, 3, 3, 3, 4,
                                                          4, 4, 5, 5 };
static const uint8_t b_height_log2_lookup[BLOCK_SIZES] = { 0, 1, 0, 1, 2, 1,
                                                           2, 3, 2, 3, 4, 3,
                                                           4, 5, 4, 5 };

static const PREDICTION_MODE intra_mode_list[] = { DC_PRED, V_PRED, H_PRED,
                                                   SMOOTH_PRED };

static const PREDICTION_MODE inter_mode_list[] = { NEARESTMV, NEARMV, GLOBALMV,
                                                   NEWMV };

static const THR_MODES mode_idx[REF_FRAMES][RTC_MODES] = {
  { THR_DC, THR_V_PRED, THR_H_PRED, THR_SMOOTH },
  { THR_NEARESTMV, THR_NEARMV, THR_GLOBALMV, THR_NEWMV },
  { THR_NEARESTL2, THR_NEARL2, THR_GLOBALL2, THR_NEWL2 },
  { THR_NEARESTL3, THR_NEARL3, THR_GLOBALL3, THR_NEWL3 },
  { THR_NEARESTG, THR_NEARG, THR_GLOBALG, THR_NEWG },
  { THR_NEARESTB, THR_NEARB, THR_GLOBALB, THR_NEWB },
  { THR_NEARESTA2, THR_NEARA2, THR_GLOBALA2, THR_NEWA2 },
  { THR_NEARESTA, THR_NEARA, THR_GLOBALA, THR_NEWA },
};

// GLOBALMV in the set below is in fact ZEROMV as we don't do global ME in RT
// mode
static const REF_MODE ref_mode_set[NUM_INTER_MODES] = {
  { LAST_FRAME, NEARESTMV },   { LAST_FRAME, NEARMV },
  { LAST_FRAME, GLOBALMV },    { LAST_FRAME, NEWMV },
  { GOLDEN_FRAME, NEARESTMV }, { GOLDEN_FRAME, NEARMV },
  { GOLDEN_FRAME, GLOBALMV },  { GOLDEN_FRAME, NEWMV },
  { ALTREF_FRAME, NEARESTMV }, { ALTREF_FRAME, NEARMV },
  { ALTREF_FRAME, GLOBALMV },  { ALTREF_FRAME, NEWMV },
};

static const COMP_REF_MODE comp_ref_mode_set[NUM_COMP_INTER_MODES_RT] = {
  { { LAST_FRAME, GOLDEN_FRAME }, GLOBAL_GLOBALMV },
  { { LAST_FRAME, GOLDEN_FRAME }, NEAREST_NEARESTMV },
  { { LAST_FRAME, LAST2_FRAME }, GLOBAL_GLOBALMV },
  { { LAST_FRAME, LAST2_FRAME }, NEAREST_NEARESTMV },
  { { LAST_FRAME, ALTREF_FRAME }, GLOBAL_GLOBALMV },
  { { LAST_FRAME, ALTREF_FRAME }, NEAREST_NEARESTMV },
};

static const int_interpfilters filters_ref_set[9] = {
  [0].as_filters = { EIGHTTAP_REGULAR, EIGHTTAP_REGULAR },
  [1].as_filters = { EIGHTTAP_SMOOTH, EIGHTTAP_SMOOTH },
  [2].as_filters = { EIGHTTAP_REGULAR, EIGHTTAP_SMOOTH },
  [3].as_filters = { EIGHTTAP_SMOOTH, EIGHTTAP_REGULAR },
  [4].as_filters = { MULTITAP_SHARP, MULTITAP_SHARP },
  [5].as_filters = { EIGHTTAP_REGULAR, MULTITAP_SHARP },
  [6].as_filters = { MULTITAP_SHARP, EIGHTTAP_REGULAR },
  [7].as_filters = { EIGHTTAP_SMOOTH, MULTITAP_SHARP },
  [8].as_filters = { MULTITAP_SHARP, EIGHTTAP_SMOOTH }
};

enum {
  //  INTER_ALL = (1 << NEARESTMV) | (1 << NEARMV) | (1 << NEWMV),
  INTER_NEAREST = (1 << NEARESTMV),
  INTER_NEAREST_NEW = (1 << NEARESTMV) | (1 << NEWMV),
  INTER_NEAREST_NEAR = (1 << NEARESTMV) | (1 << NEARMV),
  INTER_NEAR_NEW = (1 << NEARMV) | (1 << NEWMV),
};

// The original scan order (default_scan_8x8) is modified according to the extra
// transpose in hadamard c implementation, i.e., aom_hadamard_lp_8x8_c and
// aom_hadamard_8x8_c.
DECLARE_ALIGNED(16, static const int16_t, default_scan_8x8_transpose[64]) = {
  0,  8,  1,  2,  9,  16, 24, 17, 10, 3,  4,  11, 18, 25, 32, 40,
  33, 26, 19, 12, 5,  6,  13, 20, 27, 34, 41, 48, 56, 49, 42, 35,
  28, 21, 14, 7,  15, 22, 29, 36, 43, 50, 57, 58, 51, 44, 37, 30,
  23, 31, 38, 45, 52, 59, 60, 53, 46, 39, 47, 54, 61, 62, 55, 63
};

// The original scan order (av1_default_iscan_8x8) is modified to match
// hadamard AVX2 implementation, i.e., aom_hadamard_lp_8x8_avx2 and
// aom_hadamard_8x8_avx2. Since hadamard AVX2 implementation will modify the
// order of coefficients, such that the normal scan order is no longer
// guaranteed to scan low coefficients first, therefore we modify the scan order
// accordingly.
// Note that this one has to be used together with default_scan_8x8_transpose.
DECLARE_ALIGNED(16, static const int16_t,
                av1_default_iscan_8x8_transpose[64]) = {
  0,  2,  3,  9,  10, 20, 21, 35, 1,  4,  8,  11, 19, 22, 34, 36,
  5,  7,  12, 18, 23, 33, 37, 48, 6,  13, 17, 24, 32, 38, 47, 49,
  14, 16, 25, 31, 39, 46, 50, 57, 15, 26, 30, 40, 45, 51, 56, 58,
  27, 29, 41, 44, 52, 55, 59, 62, 28, 42, 43, 53, 54, 60, 61, 63
};

// The original scan order (default_scan_16x16) is modified according to the
// extra transpose in hadamard c implementation in lp case, i.e.,
// aom_hadamard_lp_16x16_c.
DECLARE_ALIGNED(16, static const int16_t,
                default_scan_lp_16x16_transpose[256]) = {
  0,   8,   2,   4,   10,  16,  24,  18,  12,  6,   64,  14,  20,  26,  32,
  40,  34,  28,  22,  72,  66,  68,  74,  80,  30,  36,  42,  48,  56,  50,
  44,  38,  88,  82,  76,  70,  128, 78,  84,  90,  96,  46,  52,  58,  1,
  9,   3,   60,  54,  104, 98,  92,  86,  136, 130, 132, 138, 144, 94,  100,
  106, 112, 62,  5,   11,  17,  25,  19,  13,  7,   120, 114, 108, 102, 152,
  146, 140, 134, 192, 142, 148, 154, 160, 110, 116, 122, 65,  15,  21,  27,
  33,  41,  35,  29,  23,  73,  67,  124, 118, 168, 162, 156, 150, 200, 194,
  196, 202, 208, 158, 164, 170, 176, 126, 69,  75,  81,  31,  37,  43,  49,
  57,  51,  45,  39,  89,  83,  77,  71,  184, 178, 172, 166, 216, 210, 204,
  198, 206, 212, 218, 224, 174, 180, 186, 129, 79,  85,  91,  97,  47,  53,
  59,  61,  55,  105, 99,  93,  87,  137, 131, 188, 182, 232, 226, 220, 214,
  222, 228, 234, 240, 190, 133, 139, 145, 95,  101, 107, 113, 63,  121, 115,
  109, 103, 153, 147, 141, 135, 248, 242, 236, 230, 238, 244, 250, 193, 143,
  149, 155, 161, 111, 117, 123, 125, 119, 169, 163, 157, 151, 201, 195, 252,
  246, 254, 197, 203, 209, 159, 165, 171, 177, 127, 185, 179, 173, 167, 217,
  211, 205, 199, 207, 213, 219, 225, 175, 181, 187, 189, 183, 233, 227, 221,
  215, 223, 229, 235, 241, 191, 249, 243, 237, 231, 239, 245, 251, 253, 247,
  255
};

#if CONFIG_AV1_HIGHBITDEPTH
// The original scan order (default_scan_16x16) is modified according to the
// extra shift in hadamard c implementation in fp case, i.e.,
// aom_hadamard_16x16_c. Note that 16x16 lp and fp hadamard generate different
// outputs, so we handle them separately.
DECLARE_ALIGNED(16, static const int16_t,
                default_scan_fp_16x16_transpose[256]) = {
  0,   4,   2,   8,   6,   16,  20,  18,  12,  10,  64,  14,  24,  22,  32,
  36,  34,  28,  26,  68,  66,  72,  70,  80,  30,  40,  38,  48,  52,  50,
  44,  42,  84,  82,  76,  74,  128, 78,  88,  86,  96,  46,  56,  54,  1,
  5,   3,   60,  58,  100, 98,  92,  90,  132, 130, 136, 134, 144, 94,  104,
  102, 112, 62,  9,   7,   17,  21,  19,  13,  11,  116, 114, 108, 106, 148,
  146, 140, 138, 192, 142, 152, 150, 160, 110, 120, 118, 65,  15,  25,  23,
  33,  37,  35,  29,  27,  69,  67,  124, 122, 164, 162, 156, 154, 196, 194,
  200, 198, 208, 158, 168, 166, 176, 126, 73,  71,  81,  31,  41,  39,  49,
  53,  51,  45,  43,  85,  83,  77,  75,  180, 178, 172, 170, 212, 210, 204,
  202, 206, 216, 214, 224, 174, 184, 182, 129, 79,  89,  87,  97,  47,  57,
  55,  61,  59,  101, 99,  93,  91,  133, 131, 188, 186, 228, 226, 220, 218,
  222, 232, 230, 240, 190, 137, 135, 145, 95,  105, 103, 113, 63,  117, 115,
  109, 107, 149, 147, 141, 139, 244, 242, 236, 234, 238, 248, 246, 193, 143,
  153, 151, 161, 111, 121, 119, 125, 123, 165, 163, 157, 155, 197, 195, 252,
  250, 254, 201, 199, 209, 159, 169, 167, 177, 127, 181, 179, 173, 171, 213,
  211, 205, 203, 207, 217, 215, 225, 175, 185, 183, 189, 187, 229, 227, 221,
  219, 223, 233, 231, 241, 191, 245, 243, 237, 235, 239, 249, 247, 253, 251,
  255
};
#endif

// The original scan order (av1_default_iscan_16x16) is modified to match
// hadamard AVX2 implementation, i.e., aom_hadamard_lp_16x16_avx2.
// Since hadamard AVX2 implementation will modify the order of coefficients,
// such that the normal scan order is no longer guaranteed to scan low
// coefficients first, therefore we modify the scan order accordingly. Note that
// this one has to be used together with default_scan_lp_16x16_transpose.
DECLARE_ALIGNED(16, static const int16_t,
                av1_default_iscan_lp_16x16_transpose[256]) = {
  0,   44,  2,   46,  3,   63,  9,   69,  1,   45,  4,   64,  8,   68,  11,
  87,  5,   65,  7,   67,  12,  88,  18,  94,  6,   66,  13,  89,  17,  93,
  24,  116, 14,  90,  16,  92,  25,  117, 31,  123, 15,  91,  26,  118, 30,
  122, 41,  148, 27,  119, 29,  121, 42,  149, 48,  152, 28,  120, 43,  150,
  47,  151, 62,  177, 10,  86,  20,  96,  21,  113, 35,  127, 19,  95,  22,
  114, 34,  126, 37,  144, 23,  115, 33,  125, 38,  145, 52,  156, 32,  124,
  39,  146, 51,  155, 58,  173, 40,  147, 50,  154, 59,  174, 73,  181, 49,
  153, 60,  175, 72,  180, 83,  198, 61,  176, 71,  179, 84,  199, 98,  202,
  70,  178, 85,  200, 97,  201, 112, 219, 36,  143, 54,  158, 55,  170, 77,
  185, 53,  157, 56,  171, 76,  184, 79,  194, 57,  172, 75,  183, 80,  195,
  102, 206, 74,  182, 81,  196, 101, 205, 108, 215, 82,  197, 100, 204, 109,
  216, 131, 223, 99,  203, 110, 217, 130, 222, 140, 232, 111, 218, 129, 221,
  141, 233, 160, 236, 128, 220, 142, 234, 159, 235, 169, 245, 78,  193, 104,
  208, 105, 212, 135, 227, 103, 207, 106, 213, 134, 226, 136, 228, 107, 214,
  133, 225, 137, 229, 164, 240, 132, 224, 138, 230, 163, 239, 165, 241, 139,
  231, 162, 238, 166, 242, 189, 249, 161, 237, 167, 243, 188, 248, 190, 250,
  168, 244, 187, 247, 191, 251, 210, 254, 186, 246, 192, 252, 209, 253, 211,
  255
};

#if CONFIG_AV1_HIGHBITDEPTH
// The original scan order (av1_default_iscan_16x16) is modified to match
// hadamard AVX2 implementation, i.e., aom_hadamard_16x16_avx2.
// Since hadamard AVX2 implementation will modify the order of coefficients,
// such that the normal scan order is no longer guaranteed to scan low
// coefficients first, therefore we modify the scan order accordingly. Note that
// this one has to be used together with default_scan_fp_16x16_transpose.
DECLARE_ALIGNED(16, static const int16_t,
                av1_default_iscan_fp_16x16_transpose[256]) = {
  0,   44,  2,   46,  1,   45,  4,   64,  3,   63,  9,   69,  8,   68,  11,
  87,  5,   65,  7,   67,  6,   66,  13,  89,  12,  88,  18,  94,  17,  93,
  24,  116, 14,  90,  16,  92,  15,  91,  26,  118, 25,  117, 31,  123, 30,
  122, 41,  148, 27,  119, 29,  121, 28,  120, 43,  150, 42,  149, 48,  152,
  47,  151, 62,  177, 10,  86,  20,  96,  19,  95,  22,  114, 21,  113, 35,
  127, 34,  126, 37,  144, 23,  115, 33,  125, 32,  124, 39,  146, 38,  145,
  52,  156, 51,  155, 58,  173, 40,  147, 50,  154, 49,  153, 60,  175, 59,
  174, 73,  181, 72,  180, 83,  198, 61,  176, 71,  179, 70,  178, 85,  200,
  84,  199, 98,  202, 97,  201, 112, 219, 36,  143, 54,  158, 53,  157, 56,
  171, 55,  170, 77,  185, 76,  184, 79,  194, 57,  172, 75,  183, 74,  182,
  81,  196, 80,  195, 102, 206, 101, 205, 108, 215, 82,  197, 100, 204, 99,
  203, 110, 217, 109, 216, 131, 223, 130, 222, 140, 232, 111, 218, 129, 221,
  128, 220, 142, 234, 141, 233, 160, 236, 159, 235, 169, 245, 78,  193, 104,
  208, 103, 207, 106, 213, 105, 212, 135, 227, 134, 226, 136, 228, 107, 214,
  133, 225, 132, 224, 138, 230, 137, 229, 164, 240, 163, 239, 165, 241, 139,
  231, 162, 238, 161, 237, 167, 243, 166, 242, 189, 249, 188, 248, 190, 250,
  168, 244, 187, 247, 186, 246, 192, 252, 191, 251, 210, 254, 209, 253, 211,
  255
};
#endif

// For entropy coding, IDTX shares the scan orders of the other 2D-transforms,
// but the fastest way to calculate the IDTX transform (i.e. no transposes)
// results in coefficients that are a transposition of the entropy coding
// versions. These tables are used as substitute for the scan order for the
// faster version of IDTX.

// Must be used together with av1_fast_idtx_iscan_4x4
DECLARE_ALIGNED(16, static const int16_t,
                av1_fast_idtx_scan_4x4[16]) = { 0, 1,  4,  8,  5, 2,  3,  6,
                                                9, 12, 13, 10, 7, 11, 14, 15 };

// Must be used together with av1_fast_idtx_scan_4x4
DECLARE_ALIGNED(16, static const int16_t,
                av1_fast_idtx_iscan_4x4[16]) = { 0, 1, 5,  6,  2, 4,  7,  12,
                                                 3, 8, 11, 13, 9, 10, 14, 15 };

static const SCAN_ORDER av1_fast_idtx_scan_order_4x4 = {
  av1_fast_idtx_scan_4x4, av1_fast_idtx_iscan_4x4
};

// Must be used together with av1_fast_idtx_iscan_8x8
DECLARE_ALIGNED(16, static const int16_t, av1_fast_idtx_scan_8x8[64]) = {
  0,  1,  8,  16, 9,  2,  3,  10, 17, 24, 32, 25, 18, 11, 4,  5,
  12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6,  7,  14, 21, 28,
  35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51,
  58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63
};

// Must be used together with av1_fast_idtx_scan_8x8
DECLARE_ALIGNED(16, static const int16_t, av1_fast_idtx_iscan_8x8[64]) = {
  0,  1,  5,  6,  14, 15, 27, 28, 2,  4,  7,  13, 16, 26, 29, 42,
  3,  8,  12, 17, 25, 30, 41, 43, 9,  11, 18, 24, 31, 40, 44, 53,
  10, 19, 23, 32, 39, 45, 52, 54, 20, 22, 33, 38, 46, 51, 55, 60,
  21, 34, 37, 47, 50, 56, 59, 61, 35, 36, 48, 49, 57, 58, 62, 63
};

static const SCAN_ORDER av1_fast_idtx_scan_order_8x8 = {
  av1_fast_idtx_scan_8x8, av1_fast_idtx_iscan_8x8
};

// Must be used together with av1_fast_idtx_iscan_16x16
DECLARE_ALIGNED(16, static const int16_t, av1_fast_idtx_scan_16x16[256]) = {
  0,   1,   16,  32,  17,  2,   3,   18,  33,  48,  64,  49,  34,  19,  4,
  5,   20,  35,  50,  65,  80,  96,  81,  66,  51,  36,  21,  6,   7,   22,
  37,  52,  67,  82,  97,  112, 128, 113, 98,  83,  68,  53,  38,  23,  8,
  9,   24,  39,  54,  69,  84,  99,  114, 129, 144, 160, 145, 130, 115, 100,
  85,  70,  55,  40,  25,  10,  11,  26,  41,  56,  71,  86,  101, 116, 131,
  146, 161, 176, 192, 177, 162, 147, 132, 117, 102, 87,  72,  57,  42,  27,
  12,  13,  28,  43,  58,  73,  88,  103, 118, 133, 148, 163, 178, 193, 208,
  224, 209, 194, 179, 164, 149, 134, 119, 104, 89,  74,  59,  44,  29,  14,
  15,  30,  45,  60,  75,  90,  105, 120, 135, 150, 165, 180, 195, 210, 225,
  240, 241, 226, 211, 196, 181, 166, 151, 136, 121, 106, 91,  76,  61,  46,
  31,  47,  62,  77,  92,  107, 122, 137, 152, 167, 182, 197, 212, 227, 242,
  243, 228, 213, 198, 183, 168, 153, 138, 123, 108, 93,  78,  63,  79,  94,
  109, 124, 139, 154, 169, 184, 199, 214, 229, 244, 245, 230, 215, 200, 185,
  170, 155, 140, 125, 110, 95,  111, 126, 141, 156, 171, 186, 201, 216, 231,
  246, 247, 232, 217, 202, 187, 172, 157, 142, 127, 143, 158, 173, 188, 203,
  218, 233, 248, 249, 234, 219, 204, 189, 174, 159, 175, 190, 205, 220, 235,
  250, 251, 236, 221, 206, 191, 207, 222, 237, 252, 253, 238, 223, 239, 254,
  255
};

// Must be used together with av1_fast_idtx_scan_16x16
DECLARE_ALIGNED(16, static const int16_t, av1_fast_idtx_iscan_16x16[256]) = {
  0,   1,   5,   6,   14,  15,  27,  28,  44,  45,  65,  66,  90,  91,  119,
  120, 2,   4,   7,   13,  16,  26,  29,  43,  46,  64,  67,  89,  92,  118,
  121, 150, 3,   8,   12,  17,  25,  30,  42,  47,  63,  68,  88,  93,  117,
  122, 149, 151, 9,   11,  18,  24,  31,  41,  48,  62,  69,  87,  94,  116,
  123, 148, 152, 177, 10,  19,  23,  32,  40,  49,  61,  70,  86,  95,  115,
  124, 147, 153, 176, 178, 20,  22,  33,  39,  50,  60,  71,  85,  96,  114,
  125, 146, 154, 175, 179, 200, 21,  34,  38,  51,  59,  72,  84,  97,  113,
  126, 145, 155, 174, 180, 199, 201, 35,  37,  52,  58,  73,  83,  98,  112,
  127, 144, 156, 173, 181, 198, 202, 219, 36,  53,  57,  74,  82,  99,  111,
  128, 143, 157, 172, 182, 197, 203, 218, 220, 54,  56,  75,  81,  100, 110,
  129, 142, 158, 171, 183, 196, 204, 217, 221, 234, 55,  76,  80,  101, 109,
  130, 141, 159, 170, 184, 195, 205, 216, 222, 233, 235, 77,  79,  102, 108,
  131, 140, 160, 169, 185, 194, 206, 215, 223, 232, 236, 245, 78,  103, 107,
  132, 139, 161, 168, 186, 193, 207, 214, 224, 231, 237, 244, 246, 104, 106,
  133, 138, 162, 167, 187, 192, 208, 213, 225, 230, 238, 243, 247, 252, 105,
  134, 137, 163, 166, 188, 191, 209, 212, 226, 229, 239, 242, 248, 251, 253,
  135, 136, 164, 165, 189, 190, 210, 211, 227, 228, 240, 241, 249, 250, 254,
  255
};

// Indicates the blocks for which RD model should be based on special logic
static INLINE int get_model_rd_flag(const AV1_COMP *cpi, const MACROBLOCKD *xd,
                                    BLOCK_SIZE bsize) {
  const int large_block = bsize >= BLOCK_32X32;
  const AV1_COMMON *const cm = &cpi->common;
  return cpi->oxcf.rc_cfg.mode == AOM_CBR && large_block &&
         !cyclic_refresh_segment_id_boosted(xd->mi[0]->segment_id) &&
         cm->quant_params.base_qindex &&
         cm->seq_params->bit_depth == AOM_BITS_8;
}
/*!\brief Finds predicted motion vectors for a block.
 *
 * \ingroup nonrd_mode_search
 * \callgraph
 * \callergraph
 * Finds predicted motion vectors for a block from a certain reference frame.
 * First, it fills reference MV stack, then picks the test from the stack and
 * predicts the final MV for a block for each mode.
 * \param[in]    cpi                      Top-level encoder structure
 * \param[in]    x                        Pointer to structure holding all the
 *                                        data for the current macroblock
 * \param[in]    ref_frame                Reference frame for which to find
 *                                        ref MVs
 * \param[in]    frame_mv                 Predicted MVs for a block
 * \param[in]    yv12_mb                  Buffer to hold predicted block
 * \param[in]    bsize                    Current block size
 * \param[in]    force_skip_low_temp_var  Flag indicating possible mode search
 *                                        prune for low temporal variance block
 * \param[in]    skip_pred_mv             Flag indicating to skip av1_mv_pred
 *
 * \remark Nothing is returned. Instead, predicted MVs are placed into
 * \c frame_mv array
 */
static INLINE void find_predictors(AV1_COMP *cpi, MACROBLOCK *x,
                                   MV_REFERENCE_FRAME ref_frame,
                                   int_mv frame_mv[MB_MODE_COUNT][REF_FRAMES],
                                   struct buf_2d yv12_mb[8][MAX_MB_PLANE],
                                   BLOCK_SIZE bsize,
                                   int force_skip_low_temp_var,
                                   int skip_pred_mv) {
  AV1_COMMON *const cm = &cpi->common;
  MACROBLOCKD *const xd = &x->e_mbd;
  MB_MODE_INFO *const mbmi = xd->mi[0];
  MB_MODE_INFO_EXT *const mbmi_ext = &x->mbmi_ext;
  const YV12_BUFFER_CONFIG *yv12 = get_ref_frame_yv12_buf(cm, ref_frame);
  const int num_planes = av1_num_planes(cm);

  x->pred_mv_sad[ref_frame] = INT_MAX;
  x->pred_mv0_sad[ref_frame] = INT_MAX;
  x->pred_mv1_sad[ref_frame] = INT_MAX;
  frame_mv[NEWMV][ref_frame].as_int = INVALID_MV;
  // TODO(kyslov) this needs various further optimizations. to be continued..
  assert(yv12 != NULL);
  if (yv12 != NULL) {
    const struct scale_factors *const sf =
        get_ref_scale_factors_const(cm, ref_frame);
    av1_setup_pred_block(xd, yv12_mb[ref_frame], yv12, sf, sf, num_planes);
    av1_find_mv_refs(cm, xd, mbmi, ref_frame, mbmi_ext->ref_mv_count,
                     xd->ref_mv_stack, xd->weight, NULL, mbmi_ext->global_mvs,
                     mbmi_ext->mode_context);
    // TODO(Ravi): Populate mbmi_ext->ref_mv_stack[ref_frame][4] and
    // mbmi_ext->weight[ref_frame][4] inside av1_find_mv_refs.
    av1_copy_usable_ref_mv_stack_and_weight(xd, mbmi_ext, ref_frame);
    av1_find_best_ref_mvs_from_stack(
        cm->features.allow_high_precision_mv, mbmi_ext, ref_frame,
        &frame_mv[NEARESTMV][ref_frame], &frame_mv[NEARMV][ref_frame], 0);
    frame_mv[GLOBALMV][ref_frame] = mbmi_ext->global_mvs[ref_frame];
    // Early exit for non-LAST frame if force_skip_low_temp_var is set.
    if (!av1_is_scaled(sf) && bsize >= BLOCK_8X8 && !skip_pred_mv &&
        !(force_skip_low_temp_var && ref_frame != LAST_FRAME)) {
      av1_mv_pred(cpi, x, yv12_mb[ref_frame][0].buf, yv12->y_stride, ref_frame,
                  bsize);
    }
  }
  if (cm->features.switchable_motion_mode) {
    av1_count_overlappable_neighbors(cm, xd);
  }
  mbmi->num_proj_ref = 1;
}

static INLINE void init_mbmi_nonrd(MB_MODE_INFO *mbmi,
                                   PREDICTION_MODE pred_mode,
                                   MV_REFERENCE_FRAME ref_frame0,
                                   MV_REFERENCE_FRAME ref_frame1,
                                   const AV1_COMMON *cm) {
  PALETTE_MODE_INFO *const pmi = &mbmi->palette_mode_info;
  mbmi->ref_mv_idx = 0;
  mbmi->mode = pred_mode;
  mbmi->uv_mode = UV_DC_PRED;
  mbmi->ref_frame[0] = ref_frame0;
  mbmi->ref_frame[1] = ref_frame1;
  pmi->palette_size[PLANE_TYPE_Y] = 0;
  pmi->palette_size[PLANE_TYPE_UV] = 0;
  mbmi->filter_intra_mode_info.use_filter_intra = 0;
  mbmi->mv[0].as_int = mbmi->mv[1].as_int = 0;
  mbmi->motion_mode = SIMPLE_TRANSLATION;
  mbmi->num_proj_ref = 1;
  mbmi->interintra_mode = 0;
  set_default_interp_filters(mbmi, cm->features.interp_filter);
}

static INLINE void init_estimate_block_intra_args(
    struct estimate_block_intra_args *args, AV1_COMP *cpi, MACROBLOCK *x) {
  args->cpi = cpi;
  args->x = x;
  args->mode = DC_PRED;
  args->skippable = 1;
  args->rdc = 0;
  args->best_sad = UINT_MAX;
  args->prune_mode_based_on_sad = false;
}

static INLINE int get_pred_buffer(PRED_BUFFER *p, int len) {
  for (int buf_idx = 0; buf_idx < len; buf_idx++) {
    if (!p[buf_idx].in_use) {
      p[buf_idx].in_use = 1;
      return buf_idx;
    }
  }
  return -1;
}

static INLINE void free_pred_buffer(PRED_BUFFER *p) {
  if (p != NULL) p->in_use = 0;
}

#if CONFIG_INTERNAL_STATS
static INLINE void store_coding_context_nonrd(MACROBLOCK *x,
                                              PICK_MODE_CONTEXT *ctx,
                                              int mode_index) {
#else
static INLINE void store_coding_context_nonrd(MACROBLOCK *x,
                                              PICK_MODE_CONTEXT *ctx) {
#endif  // CONFIG_INTERNAL_STATS
  MACROBLOCKD *const xd = &x->e_mbd;
  TxfmSearchInfo *txfm_info = &x->txfm_search_info;

  // Take a snapshot of the coding context so it can be
  // restored if we decide to encode this way
  ctx->rd_stats.skip_txfm = txfm_info->skip_txfm;

  ctx->skippable = txfm_info->skip_txfm;
#if CONFIG_INTERNAL_STATS
  ctx->best_mode_index = mode_index;
#endif  // CONFIG_INTERNAL_STATS
  ctx->mic = *xd->mi[0];
  ctx->skippable = txfm_info->skip_txfm;
  av1_copy_mbmi_ext_to_mbmi_ext_frame(&ctx->mbmi_ext_best, &x->mbmi_ext,
                                      av1_ref_frame_type(xd->mi[0]->ref_frame));
}

void av1_block_yrd(MACROBLOCK *x, RD_STATS *this_rdc, int *skippable,
                   BLOCK_SIZE bsize, TX_SIZE tx_size);

void av1_block_yrd_idtx(MACROBLOCK *x, const uint8_t *const pred_buf,
                        int pred_stride, RD_STATS *this_rdc, int *skippable,
                        BLOCK_SIZE bsize, TX_SIZE tx_size);

int64_t av1_model_rd_for_sb_uv(AV1_COMP *cpi, BLOCK_SIZE plane_bsize,
                               MACROBLOCK *x, MACROBLOCKD *xd,
                               RD_STATS *this_rdc, int start_plane,
                               int stop_plane);

void av1_estimate_block_intra(int plane, int block, int row, int col,
                              BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
                              void *arg);

void av1_estimate_intra_mode(AV1_COMP *cpi, MACROBLOCK *x, BLOCK_SIZE bsize,
                             int best_early_term, unsigned int ref_cost_intra,
                             int reuse_prediction, struct buf_2d *orig_dst,
                             PRED_BUFFER *tmp_buffers,
                             PRED_BUFFER **this_mode_pred, RD_STATS *best_rdc,
                             BEST_PICKMODE *best_pickmode,
                             PICK_MODE_CONTEXT *ctx);

#endif  // AOM_AV1_ENCODER_NONRD_OPT_H_