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

#ifndef AOM_AV1_ENCODER_BLOCK_H_
#define AOM_AV1_ENCODER_BLOCK_H_

#include "av1/common/entropymv.h"
#include "av1/common/entropy.h"
#include "av1/common/mvref_common.h"

#include "av1/encoder/enc_enums.h"
#if !CONFIG_REALTIME_ONLY
#include "av1/encoder/partition_cnn_weights.h"
#endif

#include "av1/encoder/hash.h"

#ifdef __cplusplus
extern "C" {
#endif

#define MC_FLOW_BSIZE_1D 16
#define MC_FLOW_NUM_PELS (MC_FLOW_BSIZE_1D * MC_FLOW_BSIZE_1D)
#define MAX_MC_FLOW_BLK_IN_SB (MAX_SB_SIZE / MC_FLOW_BSIZE_1D)
#define MAX_WINNER_MODE_COUNT_INTRA 3
#define MAX_WINNER_MODE_COUNT_INTER 1
typedef struct {
  MB_MODE_INFO mbmi;
  RD_STATS rd_cost;
  int64_t rd;
  int rate_y;
  int rate_uv;
  uint8_t color_index_map[64 * 64];
  THR_MODES mode_index;
} WinnerModeStats;

typedef struct {
  unsigned int sse;
  int sum;
  unsigned int var;
} DIFF;

enum {
  NO_TRELLIS_OPT,          // No trellis optimization
  FULL_TRELLIS_OPT,        // Trellis optimization in all stages
  FINAL_PASS_TRELLIS_OPT,  // Trellis optimization in only the final encode pass
  NO_ESTIMATE_YRD_TRELLIS_OPT  // Disable trellis in estimate_yrd_for_sb
} UENUM1BYTE(TRELLIS_OPT_TYPE);

typedef struct macroblock_plane {
  DECLARE_ALIGNED(32, int16_t, src_diff[MAX_SB_SQUARE]);
  tran_low_t *qcoeff;
  tran_low_t *coeff;
  uint16_t *eobs;
  uint8_t *txb_entropy_ctx;
  struct buf_2d src;

  // Quantizer setings
  // These are used/accessed only in the quantization process
  // RDO does not / must not depend on any of these values
  // All values below share the coefficient scale/shift used in TX
  const int16_t *quant_fp_QTX;
  const int16_t *round_fp_QTX;
  const int16_t *quant_QTX;
  const int16_t *quant_shift_QTX;
  const int16_t *zbin_QTX;
  const int16_t *round_QTX;
  const int16_t *dequant_QTX;
} MACROBLOCK_PLANE;

typedef struct {
  int txb_skip_cost[TXB_SKIP_CONTEXTS][2];
  int base_eob_cost[SIG_COEF_CONTEXTS_EOB][3];
  int base_cost[SIG_COEF_CONTEXTS][8];
  int eob_extra_cost[EOB_COEF_CONTEXTS][2];
  int dc_sign_cost[DC_SIGN_CONTEXTS][2];
  int lps_cost[LEVEL_CONTEXTS][COEFF_BASE_RANGE + 1 + COEFF_BASE_RANGE + 1];
} LV_MAP_COEFF_COST;

typedef struct {
  int eob_cost[2][11];
} LV_MAP_EOB_COST;

typedef struct {
  tran_low_t tcoeff[MAX_MB_PLANE][MAX_SB_SQUARE];
  uint16_t eobs[MAX_MB_PLANE][MAX_SB_SQUARE / (TX_SIZE_W_MIN * TX_SIZE_H_MIN)];
  // Transform block entropy contexts.
  // Bits 0~3: txb_skip_ctx; bits 4~5: dc_sign_ctx.
  uint8_t entropy_ctx[MAX_MB_PLANE]
                     [MAX_SB_SQUARE / (TX_SIZE_W_MIN * TX_SIZE_H_MIN)];
} CB_COEFF_BUFFER;

typedef struct {
  // TODO(angiebird): Reduce the buffer size according to sb_type
  CANDIDATE_MV ref_mv_stack[MODE_CTX_REF_FRAMES][USABLE_REF_MV_STACK_SIZE];
  uint16_t weight[MODE_CTX_REF_FRAMES][USABLE_REF_MV_STACK_SIZE];
  int_mv global_mvs[REF_FRAMES];
  int16_t mode_context[MODE_CTX_REF_FRAMES];
  uint8_t ref_mv_count[MODE_CTX_REF_FRAMES];
} MB_MODE_INFO_EXT;

// Structure to store best mode information at frame level. This
// frame level information will be used during bitstream preparation stage.
typedef struct {
  CANDIDATE_MV ref_mv_stack[USABLE_REF_MV_STACK_SIZE];
  uint16_t weight[USABLE_REF_MV_STACK_SIZE];
  // TODO(Ravi/Remya): Reduce the buffer size of global_mvs
  int_mv global_mvs[REF_FRAMES];
  int cb_offset;
  int16_t mode_context;
  uint8_t ref_mv_count;
} MB_MODE_INFO_EXT_FRAME;

typedef struct {
  uint8_t best_palette_color_map[MAX_PALETTE_SQUARE];
  int kmeans_data_buf[2 * MAX_PALETTE_SQUARE];
} PALETTE_BUFFER;

typedef struct {
  TX_SIZE tx_size;
  TX_SIZE inter_tx_size[INTER_TX_SIZE_BUF_LEN];
  uint8_t blk_skip[MAX_MIB_SIZE * MAX_MIB_SIZE];
  uint8_t tx_type_map[MAX_MIB_SIZE * MAX_MIB_SIZE];
  RD_STATS rd_stats;
  uint32_t hash_value;
} MB_RD_INFO;

#define RD_RECORD_BUFFER_LEN 8
typedef struct {
  MB_RD_INFO tx_rd_info[RD_RECORD_BUFFER_LEN];  // Circular buffer.
  int index_start;
  int num;
  CRC32C crc_calculator;  // Hash function.
} MB_RD_RECORD;

typedef struct {
  int64_t dist;
  int64_t sse;
  int rate;
  uint16_t eob;
  TX_TYPE tx_type;
  uint16_t entropy_context;
  uint8_t txb_entropy_ctx;
  uint8_t valid;
  uint8_t fast;  // This is not being used now.
  uint8_t perform_block_coeff_opt;
} TXB_RD_INFO;

#define TX_SIZE_RD_RECORD_BUFFER_LEN 256
typedef struct {
  uint32_t hash_vals[TX_SIZE_RD_RECORD_BUFFER_LEN];
  TXB_RD_INFO tx_rd_info[TX_SIZE_RD_RECORD_BUFFER_LEN];
  int index_start;
  int num;
} TXB_RD_RECORD;

typedef struct tx_size_rd_info_node {
  TXB_RD_INFO *rd_info_array;  // Points to array of size TX_TYPES.
  struct tx_size_rd_info_node *children[4];
} TXB_RD_INFO_NODE;

// Simple translation rd state for prune_comp_search_by_single_result
typedef struct {
  RD_STATS rd_stats;
  RD_STATS rd_stats_y;
  RD_STATS rd_stats_uv;
  uint8_t blk_skip[MAX_MIB_SIZE * MAX_MIB_SIZE];
  uint8_t tx_type_map[MAX_MIB_SIZE * MAX_MIB_SIZE];
  uint8_t skip;
  uint8_t disable_skip;
  uint8_t early_skipped;
} SimpleRDState;

// 4: NEAREST, NEW, NEAR, GLOBAL
#define SINGLE_REF_MODES ((REF_FRAMES - 1) * 4)

#define MAX_COMP_RD_STATS 64
typedef struct {
  int32_t rate[COMPOUND_TYPES];
  int64_t dist[COMPOUND_TYPES];
  int32_t model_rate[COMPOUND_TYPES];
  int64_t model_dist[COMPOUND_TYPES];
  int comp_rs2[COMPOUND_TYPES];
  int_mv mv[2];
  MV_REFERENCE_FRAME ref_frames[2];
  PREDICTION_MODE mode;
  int_interpfilters filter;
  int ref_mv_idx;
  int is_global[2];
  INTERINTER_COMPOUND_DATA interinter_comp;
} COMP_RD_STATS;

// Struct for buffers used by av1_compound_type_rd() function.
// For sizes and alignment of these arrays, refer to
// alloc_compound_type_rd_buffers() function.
typedef struct {
  uint8_t *pred0;
  uint8_t *pred1;
  int16_t *residual1;          // src - pred1
  int16_t *diff10;             // pred1 - pred0
  uint8_t *tmp_best_mask_buf;  // backup of the best segmentation mask
} CompoundTypeRdBuffers;

enum {
  MV_COST_ENTROPY,    // Use the entropy rate of the mv as the cost
  MV_COST_L1_LOWRES,  // Use the l1 norm of the mv as the cost (<480p)
  MV_COST_L1_MIDRES,  // Use the l1 norm of the mv as the cost (>=480p)
  MV_COST_L1_HDRES,   // Use the l1 norm of the mv as the cost (>=720p)
  MV_COST_NONE        // Use 0 as as cost irrespective of the current mv
} UENUM1BYTE(MV_COST_TYPE);

struct inter_modes_info;
typedef struct macroblock MACROBLOCK;
struct macroblock {
  struct macroblock_plane plane[MAX_MB_PLANE];

  // Determine if one would go with reduced complexity transform block
  // search model to select prediction modes, or full complexity model
  // to select transform kernel.
  int rd_model;

  // prune_comp_search_by_single_result (3:MAX_REF_MV_SEARCH)
  SimpleRDState simple_rd_state[SINGLE_REF_MODES][3];

  // Inter macroblock RD search info.
  MB_RD_RECORD mb_rd_record;

  // Inter transform block RD search info. for square TX sizes.
  TXB_RD_RECORD txb_rd_record_8X8[(MAX_MIB_SIZE >> 1) * (MAX_MIB_SIZE >> 1)];
  TXB_RD_RECORD txb_rd_record_16X16[(MAX_MIB_SIZE >> 2) * (MAX_MIB_SIZE >> 2)];
  TXB_RD_RECORD txb_rd_record_32X32[(MAX_MIB_SIZE >> 3) * (MAX_MIB_SIZE >> 3)];
  TXB_RD_RECORD txb_rd_record_64X64[(MAX_MIB_SIZE >> 4) * (MAX_MIB_SIZE >> 4)];

  // Intra transform block RD search info. for square TX sizes.
  TXB_RD_RECORD txb_rd_record_intra;

  MACROBLOCKD e_mbd;
  MB_MODE_INFO_EXT *mbmi_ext;
  MB_MODE_INFO_EXT_FRAME *mbmi_ext_frame;
  // Array of mode stats for winner mode processing
  WinnerModeStats winner_mode_stats[AOMMAX(MAX_WINNER_MODE_COUNT_INTRA,
                                           MAX_WINNER_MODE_COUNT_INTER)];
  int winner_mode_count;
  int skip_block;
  int qindex;

  // The equivalent error at the current rdmult of one whole bit (not one
  // bitcost unit).
  int errorperbit;
  // The equivalend SAD error of one (whole) bit at the current quantizer
  // for large blocks.
  int sadperbit;
  int rdmult;
  int mb_energy;
  int sb_energy_level;

  unsigned int txb_split_count;
#if CONFIG_SPEED_STATS
  unsigned int tx_search_count;
#endif  // CONFIG_SPEED_STATS

  // These are set to their default values at the beginning, and then adjusted
  // further in the encoding process.
  BLOCK_SIZE min_partition_size;
  BLOCK_SIZE max_partition_size;

  unsigned int max_mv_context[REF_FRAMES];
  unsigned int source_variance;
  unsigned int simple_motion_pred_sse;
  unsigned int pred_sse[REF_FRAMES];
  int pred_mv_sad[REF_FRAMES];
  int best_pred_mv_sad;

  int nmv_vec_cost[MV_JOINTS];
  int nmv_costs[2][MV_VALS];
  int nmv_costs_hp[2][MV_VALS];
  int *nmvcost[2];
  int *nmvcost_hp[2];
  int **mv_cost_stack;

  int32_t *wsrc_buf;
  int32_t *mask_buf;
  uint8_t *above_pred_buf;
  uint8_t *left_pred_buf;

  PALETTE_BUFFER *palette_buffer;
  CompoundTypeRdBuffers comp_rd_buffer;

  CONV_BUF_TYPE *tmp_conv_dst;
  uint8_t *tmp_obmc_bufs[2];

  FRAME_CONTEXT *row_ctx;
  // This context will be used to update color_map_cdf pointer which would be
  // used during pack bitstream. For single thread and tile-multithreading case
  // this ponter will be same as xd->tile_ctx, but for the case of row-mt:
  // xd->tile_ctx will point to a temporary context while tile_pb_ctx will point
  // to the accurate tile context.
  FRAME_CONTEXT *tile_pb_ctx;

  struct inter_modes_info *inter_modes_info;

  // Contains the hash table, hash function, and buffer used for intrabc
  IntraBCHashInfo intrabc_hash_info;

  // These define limits to motion vector components to prevent them
  // from extending outside the UMV borders
  FullMvLimits mv_limits;

  uint8_t blk_skip[MAX_MIB_SIZE * MAX_MIB_SIZE];
  uint8_t tx_type_map[MAX_MIB_SIZE * MAX_MIB_SIZE];

  // Force the coding block to skip transform and quantization.
  int force_skip;
  int skip_cost[SKIP_CONTEXTS][2];

  int skip_mode;  // 0: off; 1: on
  int skip_mode_cost[SKIP_CONTEXTS][2];

  LV_MAP_COEFF_COST coeff_costs[TX_SIZES][PLANE_TYPES];
  LV_MAP_EOB_COST eob_costs[7][2];
  uint16_t cb_offset;

  // mode costs
  int intra_inter_cost[INTRA_INTER_CONTEXTS][2];

  int mbmode_cost[BLOCK_SIZE_GROUPS][INTRA_MODES];
  int newmv_mode_cost[NEWMV_MODE_CONTEXTS][2];
  int zeromv_mode_cost[GLOBALMV_MODE_CONTEXTS][2];
  int refmv_mode_cost[REFMV_MODE_CONTEXTS][2];
  int drl_mode_cost0[DRL_MODE_CONTEXTS][2];

  int comp_inter_cost[COMP_INTER_CONTEXTS][2];
  int single_ref_cost[REF_CONTEXTS][SINGLE_REFS - 1][2];
  int comp_ref_type_cost[COMP_REF_TYPE_CONTEXTS]
                        [CDF_SIZE(COMP_REFERENCE_TYPES)];
  int uni_comp_ref_cost[UNI_COMP_REF_CONTEXTS][UNIDIR_COMP_REFS - 1]
                       [CDF_SIZE(2)];
  // Cost for signaling ref_frame[0] (LAST_FRAME, LAST2_FRAME, LAST3_FRAME or
  // GOLDEN_FRAME) in bidir-comp mode.
  int comp_ref_cost[REF_CONTEXTS][FWD_REFS - 1][2];
  // Cost for signaling ref_frame[1] (ALTREF_FRAME, ALTREF2_FRAME, or
  // BWDREF_FRAME) in bidir-comp mode.
  int comp_bwdref_cost[REF_CONTEXTS][BWD_REFS - 1][2];
  int inter_compound_mode_cost[INTER_MODE_CONTEXTS][INTER_COMPOUND_MODES];
  int compound_type_cost[BLOCK_SIZES_ALL][MASKED_COMPOUND_TYPES];
  int wedge_idx_cost[BLOCK_SIZES_ALL][16];
  int interintra_cost[BLOCK_SIZE_GROUPS][2];
  int wedge_interintra_cost[BLOCK_SIZES_ALL][2];
  int interintra_mode_cost[BLOCK_SIZE_GROUPS][INTERINTRA_MODES];
  int motion_mode_cost[BLOCK_SIZES_ALL][MOTION_MODES];
  int motion_mode_cost1[BLOCK_SIZES_ALL][2];
  int intra_uv_mode_cost[CFL_ALLOWED_TYPES][INTRA_MODES][UV_INTRA_MODES];
  int y_mode_costs[INTRA_MODES][INTRA_MODES][INTRA_MODES];
  int filter_intra_cost[BLOCK_SIZES_ALL][2];
  int filter_intra_mode_cost[FILTER_INTRA_MODES];
  int switchable_interp_costs[SWITCHABLE_FILTER_CONTEXTS][SWITCHABLE_FILTERS];
  int partition_cost[PARTITION_CONTEXTS][EXT_PARTITION_TYPES];
  int palette_y_size_cost[PALATTE_BSIZE_CTXS][PALETTE_SIZES];
  int palette_uv_size_cost[PALATTE_BSIZE_CTXS][PALETTE_SIZES];
  int palette_y_color_cost[PALETTE_SIZES][PALETTE_COLOR_INDEX_CONTEXTS]
                          [PALETTE_COLORS];
  int palette_uv_color_cost[PALETTE_SIZES][PALETTE_COLOR_INDEX_CONTEXTS]
                           [PALETTE_COLORS];
  int palette_y_mode_cost[PALATTE_BSIZE_CTXS][PALETTE_Y_MODE_CONTEXTS][2];
  int palette_uv_mode_cost[PALETTE_UV_MODE_CONTEXTS][2];
  // The rate associated with each alpha codeword
  int cfl_cost[CFL_JOINT_SIGNS][CFL_PRED_PLANES][CFL_ALPHABET_SIZE];
  int tx_size_cost[TX_SIZES - 1][TX_SIZE_CONTEXTS][TX_SIZES];
  int txfm_partition_cost[TXFM_PARTITION_CONTEXTS][2];
  int inter_tx_type_costs[EXT_TX_SETS_INTER][EXT_TX_SIZES][TX_TYPES];
  int intra_tx_type_costs[EXT_TX_SETS_INTRA][EXT_TX_SIZES][INTRA_MODES]
                         [TX_TYPES];
  int angle_delta_cost[DIRECTIONAL_MODES][2 * MAX_ANGLE_DELTA + 1];
  int switchable_restore_cost[RESTORE_SWITCHABLE_TYPES];
  int wiener_restore_cost[2];
  int sgrproj_restore_cost[2];
  int intrabc_cost[2];

  // Used to store sub partition's choices.
  MV pred_mv[REF_FRAMES];

  // Ref frames that are selected by square partition blocks within a super-
  // block, in MI resolution. They can be used to prune ref frames for
  // rectangular blocks.
  int picked_ref_frames_mask[32 * 32];

  // use default transform and skip transform type search for intra modes
  int use_default_intra_tx_type;
  // use default transform and skip transform type search for inter modes
  int use_default_inter_tx_type;
  int comp_idx_cost[COMP_INDEX_CONTEXTS][2];
  int comp_group_idx_cost[COMP_GROUP_IDX_CONTEXTS][2];
  int must_find_valid_partition;
  int recalc_luma_mc_data;  // Flag to indicate recalculation of MC data during
                            // interpolation filter search
  int prune_mode;
  uint32_t tx_domain_dist_threshold;
  int use_transform_domain_distortion;
  // The likelihood of an edge existing in the block (using partial Canny edge
  // detection). For reference, 556 is the value returned for a solid
  // vertical black/white edge.
  uint16_t edge_strength;
  // The strongest edge strength seen along the x/y axis.
  uint16_t edge_strength_x;
  uint16_t edge_strength_y;
  uint8_t compound_idx;

  // [Saved stat index]
  COMP_RD_STATS comp_rd_stats[MAX_COMP_RD_STATS];
  int comp_rd_stats_idx;

  CB_COEFF_BUFFER *cb_coef_buff;

  // Threshold used to decide the applicability of R-D optimization of
  // quantized coeffs
  uint32_t coeff_opt_dist_threshold;

#if !CONFIG_REALTIME_ONLY
  int quad_tree_idx;
  int cnn_output_valid;
  float cnn_buffer[CNN_OUT_BUF_SIZE];
  float log_q;
#endif
  int thresh_freq_fact[BLOCK_SIZES_ALL][MAX_MODES];
  // 0 - 128x128
  // 1-2 - 128x64
  // 3-4 - 64x128
  // 5-8 - 64x64
  // 9-16 - 64x32
  // 17-24 - 32x64
  // 25-40 - 32x32
  // 41-104 - 16x16
  uint8_t variance_low[105];
  uint8_t content_state_sb;
  // Strong color activity detection. Used in REALTIME coding mode to enhance
  // the visual quality at the boundary of moving color objects.
  uint8_t color_sensitivity[2];
  int nonrd_prune_ref_frame_search;

  // Used to control the tx size search evaluation for mode processing
  // (normal/winner mode)
  int tx_size_search_method;
  // This tx_mode_search_type is used internally by the encoder, and is not
  // written to the bitstream. It determines what kind of tx_mode should be
  // searched. For example, we might set it to TX_MODE_LARGEST to find a good
  // candidate, then use TX_MODE_SELECT on it
  TX_MODE tx_mode_search_type;

  // Used to control aggressiveness of skip flag prediction for mode processing
  // (normal/winner mode)
  unsigned int predict_skip_level;

  // Copy out this SB's TPL block stats.
  int valid_cost_b;
  int64_t inter_cost_b[MAX_MC_FLOW_BLK_IN_SB * MAX_MC_FLOW_BLK_IN_SB];
  int64_t intra_cost_b[MAX_MC_FLOW_BLK_IN_SB * MAX_MC_FLOW_BLK_IN_SB];
  int_mv mv_b[MAX_MC_FLOW_BLK_IN_SB * MAX_MC_FLOW_BLK_IN_SB]
             [INTER_REFS_PER_FRAME];
  int cost_stride;

  // The type of mv cost used during motion search
  MV_COST_TYPE mv_cost_type;

  uint8_t search_ref_frame[REF_FRAMES];

#if CONFIG_AV1_HIGHBITDEPTH
  void (*fwd_txfm4x4)(const int16_t *input, tran_low_t *output, int stride);
  void (*inv_txfm_add)(const tran_low_t *input, uint8_t *dest, int stride,
                       int eob);
#else
  void (*fwd_txfm4x4)(const int16_t *input, int16_t *output, int stride);
  void (*inv_txfm_add)(const int16_t *input, uint8_t *dest, int stride,
                       int eob);
#endif
};

// Only consider full SB, MC_FLOW_BSIZE_1D = 16.
static INLINE int tpl_blocks_in_sb(BLOCK_SIZE bsize) {
  switch (bsize) {
    case BLOCK_64X64: return 16;
    case BLOCK_128X128: return 64;
    default: assert(0);
  }
  return -1;
}

static INLINE int is_rect_tx_allowed_bsize(BLOCK_SIZE bsize) {
  static const char LUT[BLOCK_SIZES_ALL] = {
    0,  // BLOCK_4X4
    1,  // BLOCK_4X8
    1,  // BLOCK_8X4
    0,  // BLOCK_8X8
    1,  // BLOCK_8X16
    1,  // BLOCK_16X8
    0,  // BLOCK_16X16
    1,  // BLOCK_16X32
    1,  // BLOCK_32X16
    0,  // BLOCK_32X32
    1,  // BLOCK_32X64
    1,  // BLOCK_64X32
    0,  // BLOCK_64X64
    0,  // BLOCK_64X128
    0,  // BLOCK_128X64
    0,  // BLOCK_128X128
    1,  // BLOCK_4X16
    1,  // BLOCK_16X4
    1,  // BLOCK_8X32
    1,  // BLOCK_32X8
    1,  // BLOCK_16X64
    1,  // BLOCK_64X16
  };

  return LUT[bsize];
}

static INLINE int is_rect_tx_allowed(const MACROBLOCKD *xd,
                                     const MB_MODE_INFO *mbmi) {
  return is_rect_tx_allowed_bsize(mbmi->sb_type) &&
         !xd->lossless[mbmi->segment_id];
}

static INLINE int tx_size_to_depth(TX_SIZE tx_size, BLOCK_SIZE bsize) {
  TX_SIZE ctx_size = max_txsize_rect_lookup[bsize];
  int depth = 0;
  while (tx_size != ctx_size) {
    depth++;
    ctx_size = sub_tx_size_map[ctx_size];
    assert(depth <= MAX_TX_DEPTH);
  }
  return depth;
}

static INLINE void set_blk_skip(MACROBLOCK *x, int plane, int blk_idx,
                                int skip) {
  if (skip)
    x->blk_skip[blk_idx] |= 1UL << plane;
  else
    x->blk_skip[blk_idx] &= ~(1UL << plane);
#ifndef NDEBUG
  // Set chroma planes to uninitialized states when luma is set to check if
  // it will be set later
  if (plane == 0) {
    x->blk_skip[blk_idx] |= 1UL << (1 + 4);
    x->blk_skip[blk_idx] |= 1UL << (2 + 4);
  }

  // Clear the initialization checking bit
  x->blk_skip[blk_idx] &= ~(1UL << (plane + 4));
#endif
}

static INLINE int is_blk_skip(MACROBLOCK *x, int plane, int blk_idx) {
#ifndef NDEBUG
  // Check if this is initialized
  assert(!(x->blk_skip[blk_idx] & (1UL << (plane + 4))));

  // The magic number is 0x77, this is to test if there is garbage data
  assert((x->blk_skip[blk_idx] & 0x88) == 0);
#endif
  return (x->blk_skip[blk_idx] >> plane) & 1;
}

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // AOM_AV1_ENCODER_BLOCK_H_