/src/aom/av1/common/entropymode.h

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/*
 * 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_COMMON_ENTROPYMODE_H_
#define AOM_AV1_COMMON_ENTROPYMODE_H_

#include "aom_ports/bitops.h"
#include "av1/common/entropy.h"
#include "av1/common/entropymv.h"
#include "av1/common/filter.h"
#include "av1/common/seg_common.h"

#ifdef __cplusplus
extern "C" {
#endif

#define BLOCK_SIZE_GROUPS 4

#define TX_SIZE_CONTEXTS 3

#define INTER_OFFSET(mode) ((mode)-NEARESTMV)
#define INTER_COMPOUND_OFFSET(mode) (uint8_t)((mode)-NEAREST_NEARESTMV)

// Number of possible contexts for a color index.
// As can be seen from av1_get_palette_color_index_context(), the possible
// contexts are (2,0,0), (2,2,1), (3,2,0), (4,1,0), (5,0,0). These are mapped to
// a value from 0 to 4 using 'av1_palette_color_index_context_lookup' table.
#define PALETTE_COLOR_INDEX_CONTEXTS 5

// Palette Y mode context for a block is determined by number of neighboring
// blocks (top and/or left) using a palette for Y plane. So, possible Y mode'
// context values are:
// 0 if neither left nor top block uses palette for Y plane,
// 1 if exactly one of left or top block uses palette for Y plane, and
// 2 if both left and top blocks use palette for Y plane.
#define PALETTE_Y_MODE_CONTEXTS 3

// Palette UV mode context for a block is determined by whether this block uses
// palette for the Y plane. So, possible values are:
// 0 if this block doesn't use palette for Y plane.
// 1 if this block uses palette for Y plane (i.e. Y palette size > 0).
#define PALETTE_UV_MODE_CONTEXTS 2

// Map the number of pixels in a block size to a context
//   64(BLOCK_8X8, BLOCK_4x16, BLOCK_16X4)  -> 0
//  128(BLOCK_8X16, BLOCK_16x8)             -> 1
//   ...
// 4096(BLOCK_64X64)                        -> 6
#define PALATTE_BSIZE_CTXS 7

#define MAX_COLOR_CONTEXT_HASH 8

#define NUM_PALETTE_NEIGHBORS 3  // left, top-left and top.

#define KF_MODE_CONTEXTS 5

struct AV1Common;

typedef struct {
  const int16_t *scan;
  const int16_t *iscan;
} SCAN_ORDER;

typedef struct frame_contexts {
  aom_cdf_prob txb_skip_cdf[TX_SIZES][TXB_SKIP_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob eob_extra_cdf[TX_SIZES][PLANE_TYPES][EOB_COEF_CONTEXTS]
                            [CDF_SIZE(2)];
  aom_cdf_prob dc_sign_cdf[PLANE_TYPES][DC_SIGN_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob eob_flag_cdf16[PLANE_TYPES][2][CDF_SIZE(5)];
  aom_cdf_prob eob_flag_cdf32[PLANE_TYPES][2][CDF_SIZE(6)];
  aom_cdf_prob eob_flag_cdf64[PLANE_TYPES][2][CDF_SIZE(7)];
  aom_cdf_prob eob_flag_cdf128[PLANE_TYPES][2][CDF_SIZE(8)];
  aom_cdf_prob eob_flag_cdf256[PLANE_TYPES][2][CDF_SIZE(9)];
  aom_cdf_prob eob_flag_cdf512[PLANE_TYPES][2][CDF_SIZE(10)];
  aom_cdf_prob eob_flag_cdf1024[PLANE_TYPES][2][CDF_SIZE(11)];
  aom_cdf_prob coeff_base_eob_cdf[TX_SIZES][PLANE_TYPES][SIG_COEF_CONTEXTS_EOB]
                                 [CDF_SIZE(3)];
  aom_cdf_prob coeff_base_cdf[TX_SIZES][PLANE_TYPES][SIG_COEF_CONTEXTS]
                             [CDF_SIZE(4)];
  aom_cdf_prob coeff_br_cdf[TX_SIZES][PLANE_TYPES][LEVEL_CONTEXTS]
                           [CDF_SIZE(BR_CDF_SIZE)];

  aom_cdf_prob newmv_cdf[NEWMV_MODE_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob zeromv_cdf[GLOBALMV_MODE_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob refmv_cdf[REFMV_MODE_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob drl_cdf[DRL_MODE_CONTEXTS][CDF_SIZE(2)];

  aom_cdf_prob inter_compound_mode_cdf[INTER_MODE_CONTEXTS]
                                      [CDF_SIZE(INTER_COMPOUND_MODES)];
  aom_cdf_prob compound_type_cdf[BLOCK_SIZES_ALL]
                                [CDF_SIZE(MASKED_COMPOUND_TYPES)];
  aom_cdf_prob wedge_idx_cdf[BLOCK_SIZES_ALL][CDF_SIZE(16)];
  aom_cdf_prob interintra_cdf[BLOCK_SIZE_GROUPS][CDF_SIZE(2)];
  aom_cdf_prob wedge_interintra_cdf[BLOCK_SIZES_ALL][CDF_SIZE(2)];
  aom_cdf_prob interintra_mode_cdf[BLOCK_SIZE_GROUPS]
                                  [CDF_SIZE(INTERINTRA_MODES)];
  aom_cdf_prob motion_mode_cdf[BLOCK_SIZES_ALL][CDF_SIZE(MOTION_MODES)];
  aom_cdf_prob obmc_cdf[BLOCK_SIZES_ALL][CDF_SIZE(2)];
  aom_cdf_prob palette_y_size_cdf[PALATTE_BSIZE_CTXS][CDF_SIZE(PALETTE_SIZES)];
  aom_cdf_prob palette_uv_size_cdf[PALATTE_BSIZE_CTXS][CDF_SIZE(PALETTE_SIZES)];
  aom_cdf_prob palette_y_color_index_cdf[PALETTE_SIZES]
                                        [PALETTE_COLOR_INDEX_CONTEXTS]
                                        [CDF_SIZE(PALETTE_COLORS)];
  aom_cdf_prob palette_uv_color_index_cdf[PALETTE_SIZES]
                                         [PALETTE_COLOR_INDEX_CONTEXTS]
                                         [CDF_SIZE(PALETTE_COLORS)];
  aom_cdf_prob palette_y_mode_cdf[PALATTE_BSIZE_CTXS][PALETTE_Y_MODE_CONTEXTS]
                                 [CDF_SIZE(2)];
  aom_cdf_prob palette_uv_mode_cdf[PALETTE_UV_MODE_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob comp_inter_cdf[COMP_INTER_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob single_ref_cdf[REF_CONTEXTS][SINGLE_REFS - 1][CDF_SIZE(2)];
  aom_cdf_prob comp_ref_type_cdf[COMP_REF_TYPE_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob uni_comp_ref_cdf[UNI_COMP_REF_CONTEXTS][UNIDIR_COMP_REFS - 1]
                               [CDF_SIZE(2)];
  aom_cdf_prob comp_ref_cdf[REF_CONTEXTS][FWD_REFS - 1][CDF_SIZE(2)];
  aom_cdf_prob comp_bwdref_cdf[REF_CONTEXTS][BWD_REFS - 1][CDF_SIZE(2)];
  aom_cdf_prob txfm_partition_cdf[TXFM_PARTITION_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob compound_index_cdf[COMP_INDEX_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob comp_group_idx_cdf[COMP_GROUP_IDX_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob skip_mode_cdfs[SKIP_MODE_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob skip_txfm_cdfs[SKIP_CONTEXTS][CDF_SIZE(2)];
  aom_cdf_prob intra_inter_cdf[INTRA_INTER_CONTEXTS][CDF_SIZE(2)];
  nmv_context nmvc;
  nmv_context ndvc;
  aom_cdf_prob intrabc_cdf[CDF_SIZE(2)];
  struct segmentation_probs seg;
  aom_cdf_prob filter_intra_cdfs[BLOCK_SIZES_ALL][CDF_SIZE(2)];
  aom_cdf_prob filter_intra_mode_cdf[CDF_SIZE(FILTER_INTRA_MODES)];
  aom_cdf_prob switchable_restore_cdf[CDF_SIZE(RESTORE_SWITCHABLE_TYPES)];
  aom_cdf_prob wiener_restore_cdf[CDF_SIZE(2)];
  aom_cdf_prob sgrproj_restore_cdf[CDF_SIZE(2)];
  aom_cdf_prob y_mode_cdf[BLOCK_SIZE_GROUPS][CDF_SIZE(INTRA_MODES)];
  aom_cdf_prob uv_mode_cdf[CFL_ALLOWED_TYPES][INTRA_MODES]
                          [CDF_SIZE(UV_INTRA_MODES)];
  aom_cdf_prob partition_cdf[PARTITION_CONTEXTS][CDF_SIZE(EXT_PARTITION_TYPES)];
  aom_cdf_prob switchable_interp_cdf[SWITCHABLE_FILTER_CONTEXTS]
                                    [CDF_SIZE(SWITCHABLE_FILTERS)];
  /* kf_y_cdf is discarded after use, so does not require persistent storage.
     However, we keep it with the other CDFs in this struct since it needs to
     be copied to each tile to support parallelism just like the others.
  */
  aom_cdf_prob kf_y_cdf[KF_MODE_CONTEXTS][KF_MODE_CONTEXTS]
                       [CDF_SIZE(INTRA_MODES)];

  aom_cdf_prob angle_delta_cdf[DIRECTIONAL_MODES]
                              [CDF_SIZE(2 * MAX_ANGLE_DELTA + 1)];

  aom_cdf_prob tx_size_cdf[MAX_TX_CATS][TX_SIZE_CONTEXTS]
                          [CDF_SIZE(MAX_TX_DEPTH + 1)];
  aom_cdf_prob delta_q_cdf[CDF_SIZE(DELTA_Q_PROBS + 1)];
  aom_cdf_prob delta_lf_multi_cdf[FRAME_LF_COUNT][CDF_SIZE(DELTA_LF_PROBS + 1)];
  aom_cdf_prob delta_lf_cdf[CDF_SIZE(DELTA_LF_PROBS + 1)];
  aom_cdf_prob intra_ext_tx_cdf[EXT_TX_SETS_INTRA][EXT_TX_SIZES][INTRA_MODES]
                               [CDF_SIZE(TX_TYPES)];
  aom_cdf_prob inter_ext_tx_cdf[EXT_TX_SETS_INTER][EXT_TX_SIZES]
                               [CDF_SIZE(TX_TYPES)];
  aom_cdf_prob cfl_sign_cdf[CDF_SIZE(CFL_JOINT_SIGNS)];
  aom_cdf_prob cfl_alpha_cdf[CFL_ALPHA_CONTEXTS][CDF_SIZE(CFL_ALPHABET_SIZE)];
  int initialized;
} FRAME_CONTEXT;

static const int av1_ext_tx_ind[EXT_TX_SET_TYPES][TX_TYPES] = {
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 1, 3, 4, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 1, 5, 6, 4, 0, 0, 0, 0, 0, 0, 2, 3, 0, 0, 0, 0 },
  { 3, 4, 5, 8, 6, 7, 9, 10, 11, 0, 1, 2, 0, 0, 0, 0 },
  { 7, 8, 9, 12, 10, 11, 13, 14, 15, 0, 1, 2, 3, 4, 5, 6 },
};

static const int av1_ext_tx_inv[EXT_TX_SET_TYPES][TX_TYPES] = {
  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 9, 0, 3, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 9, 0, 10, 11, 3, 1, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
  { 9, 10, 11, 0, 1, 2, 4, 5, 3, 6, 7, 8, 0, 0, 0, 0 },
  { 9, 10, 11, 12, 13, 14, 15, 0, 1, 2, 4, 5, 3, 6, 7, 8 },
};

void av1_set_default_ref_deltas(int8_t *ref_deltas);
void av1_set_default_mode_deltas(int8_t *mode_deltas);
void av1_setup_frame_contexts(struct AV1Common *cm);
void av1_setup_past_independence(struct AV1Common *cm);

// Returns (int)ceil(log2(n)).
static inline int av1_ceil_log2(int n) {
  if (n < 2) return 0;
  return get_msb(n - 1) + 1;
}

// Returns the context for palette color index at row 'r' and column 'c',
// along with the 'color_order' of neighbors and the 'color_idx'.
// The 'color_map' is a 2D array with the given 'stride'.
int av1_get_palette_color_index_context(const uint8_t *color_map, int stride,
                                        int r, int c, int palette_size,
                                        uint8_t *color_order, int *color_idx);

extern const int
    av1_palette_color_index_context_lookup[MAX_COLOR_CONTEXT_HASH + 1];

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

#endif  // AOM_AV1_COMMON_ENTROPYMODE_H_

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Created: 2025-06-22 08:04