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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_ENUMS_H_
+#define AOM_AV1_COMMON_ENUMS_H_
+
+#include "config/aom_config.h"
+
+#include "aom/aom_codec.h"
+#include "aom/aom_integer.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#undef MAX_SB_SIZE
+
+// Max superblock size
+#define MAX_SB_SIZE_LOG2 7
+#define MAX_SB_SIZE (1 << MAX_SB_SIZE_LOG2)
+#define MAX_SB_SQUARE (MAX_SB_SIZE * MAX_SB_SIZE)
+
+// Min superblock size
+#define MIN_SB_SIZE_LOG2 6
+
+// Pixels per Mode Info (MI) unit
+#define MI_SIZE_LOG2 2
+#define MI_SIZE (1 << MI_SIZE_LOG2)
+
+// MI-units per max superblock (MI Block - MIB)
+#define MAX_MIB_SIZE_LOG2 (MAX_SB_SIZE_LOG2 - MI_SIZE_LOG2)
+#define MAX_MIB_SIZE (1 << MAX_MIB_SIZE_LOG2)
+
+// MI-units per min superblock
+#define MIN_MIB_SIZE_LOG2 (MIN_SB_SIZE_LOG2 - MI_SIZE_LOG2)
+
+// Mask to extract MI offset within max MIB
+#define MAX_MIB_MASK (MAX_MIB_SIZE - 1)
+
+// Maximum number of tile rows and tile columns
+#define MAX_TILE_ROWS 64
+#define MAX_TILE_COLS 64
+
+#define MAX_VARTX_DEPTH 2
+
+#define MI_SIZE_64X64 (64 >> MI_SIZE_LOG2)
+#define MI_SIZE_128X128 (128 >> MI_SIZE_LOG2)
+
+#define MAX_PALETTE_SQUARE (64 * 64)
+// Maximum number of colors in a palette.
+#define PALETTE_MAX_SIZE 8
+// Minimum number of colors in a palette.
+#define PALETTE_MIN_SIZE 2
+
+#define FRAME_OFFSET_BITS 5
+#define MAX_FRAME_DISTANCE ((1 << FRAME_OFFSET_BITS) - 1)
+
+#define REF_FRAMES_LOG2 3
+#define REF_FRAMES (1 << REF_FRAMES_LOG2)
+
+// 4 scratch frames for the new frames to support a maximum of 4 cores decoding
+// in parallel, 3 for scaled references on the encoder.
+// TODO(hkuang): Add ondemand frame buffers instead of hardcoding the number
+// of framebuffers.
+// TODO(jkoleszar): These 3 extra references could probably come from the
+// normal reference pool.
+#define FRAME_BUFFERS (REF_FRAMES + 7)
+
+// 4 frame filter levels: y plane vertical, y plane horizontal,
+// u plane, and v plane
+#define FRAME_LF_COUNT 4
+#define DEFAULT_DELTA_LF_MULTI 0
+#define MAX_MODE_LF_DELTAS 2
+
+#define DIST_PRECISION_BITS 4
+#define DIST_PRECISION (1 << DIST_PRECISION_BITS) // 16
+
+// TODO(chengchen): Temporal flag serve as experimental flag for WIP
+// bitmask construction.
+// Shall be removed when bitmask code is completely checkedin
+#define LOOP_FILTER_BITMASK 0
+
+#define PROFILE_BITS 3
+// The following three profiles are currently defined.
+// Profile 0. 8-bit and 10-bit 4:2:0 and 4:0:0 only.
+// Profile 1. 8-bit and 10-bit 4:4:4
+// Profile 2. 8-bit and 10-bit 4:2:2
+// 12-bit 4:0:0, 4:2:2 and 4:4:4
+// Since we have three bits for the profiles, it can be extended later.
+typedef enum BITSTREAM_PROFILE {
+ PROFILE_0,
+ PROFILE_1,
+ PROFILE_2,
+ MAX_PROFILES,
+} BITSTREAM_PROFILE;
+
+#define LEVEL_MAJOR_BITS 3
+#define LEVEL_MINOR_BITS 2
+#define LEVEL_BITS (LEVEL_MAJOR_BITS + LEVEL_MINOR_BITS)
+
+#define LEVEL_MAJOR_MIN 2
+#define LEVEL_MAJOR_MAX ((1 << LEVEL_MAJOR_BITS) - 1 + LEVEL_MAJOR_MIN)
+#define LEVEL_MINOR_MIN 0
+#define LEVEL_MINOR_MAX ((1 << LEVEL_MINOR_BITS) - 1)
+
+#define OP_POINTS_CNT_MINUS_1_BITS 5
+#define OP_POINTS_IDC_BITS 12
+
+// Note: Some enums use the attribute 'packed' to use smallest possible integer
+// type, so that we can save memory when they are used in structs/arrays.
+
+typedef enum ATTRIBUTE_PACKED {
+ BLOCK_4X4,
+ BLOCK_4X8,
+ BLOCK_8X4,
+ BLOCK_8X8,
+ BLOCK_8X16,
+ BLOCK_16X8,
+ BLOCK_16X16,
+ BLOCK_16X32,
+ BLOCK_32X16,
+ BLOCK_32X32,
+ BLOCK_32X64,
+ BLOCK_64X32,
+ BLOCK_64X64,
+ BLOCK_64X128,
+ BLOCK_128X64,
+ BLOCK_128X128,
+ BLOCK_4X16,
+ BLOCK_16X4,
+ BLOCK_8X32,
+ BLOCK_32X8,
+ BLOCK_16X64,
+ BLOCK_64X16,
+ BLOCK_SIZES_ALL,
+ BLOCK_SIZES = BLOCK_4X16,
+ BLOCK_INVALID = 255,
+ BLOCK_LARGEST = (BLOCK_SIZES - 1)
+} BLOCK_SIZE;
+
+// 4X4, 8X8, 16X16, 32X32, 64X64, 128X128
+#define SQR_BLOCK_SIZES 6
+
+typedef enum ATTRIBUTE_PACKED {
+ PARTITION_NONE,
+ PARTITION_HORZ,
+ PARTITION_VERT,
+ PARTITION_SPLIT,
+ PARTITION_HORZ_A, // HORZ split and the top partition is split again
+ PARTITION_HORZ_B, // HORZ split and the bottom partition is split again
+ PARTITION_VERT_A, // VERT split and the left partition is split again
+ PARTITION_VERT_B, // VERT split and the right partition is split again
+ PARTITION_HORZ_4, // 4:1 horizontal partition
+ PARTITION_VERT_4, // 4:1 vertical partition
+ EXT_PARTITION_TYPES,
+ PARTITION_TYPES = PARTITION_SPLIT + 1,
+ PARTITION_INVALID = 255
+} PARTITION_TYPE;
+
+typedef char PARTITION_CONTEXT;
+#define PARTITION_PLOFFSET 4 // number of probability models per block size
+#define PARTITION_BLOCK_SIZES 5
+#define PARTITION_CONTEXTS (PARTITION_BLOCK_SIZES * PARTITION_PLOFFSET)
+
+// block transform size
+#if defined(_MSC_VER)
+typedef uint8_t TX_SIZE;
+enum ATTRIBUTE_PACKED {
+#else
+typedef enum ATTRIBUTE_PACKED {
+#endif
+ TX_4X4, // 4x4 transform
+ TX_8X8, // 8x8 transform
+ TX_16X16, // 16x16 transform
+ TX_32X32, // 32x32 transform
+ TX_64X64, // 64x64 transform
+ TX_4X8, // 4x8 transform
+ TX_8X4, // 8x4 transform
+ TX_8X16, // 8x16 transform
+ TX_16X8, // 16x8 transform
+ TX_16X32, // 16x32 transform
+ TX_32X16, // 32x16 transform
+ TX_32X64, // 32x64 transform
+ TX_64X32, // 64x32 transform
+ TX_4X16, // 4x16 transform
+ TX_16X4, // 16x4 transform
+ TX_8X32, // 8x32 transform
+ TX_32X8, // 32x8 transform
+ TX_16X64, // 16x64 transform
+ TX_64X16, // 64x16 transform
+ TX_SIZES_ALL, // Includes rectangular transforms
+ TX_SIZES = TX_4X8, // Does NOT include rectangular transforms
+ TX_SIZES_LARGEST = TX_64X64,
+ TX_INVALID = 255 // Invalid transform size
+#if defined(_MSC_VER)
+};
+#else
+} TX_SIZE;
+#endif
+
+#define TX_SIZE_LUMA_MIN (TX_4X4)
+/* We don't need to code a transform size unless the allowed size is at least
+ one more than the minimum. */
+#define TX_SIZE_CTX_MIN (TX_SIZE_LUMA_MIN + 1)
+
+// Maximum tx_size categories
+#define MAX_TX_CATS (TX_SIZES - TX_SIZE_CTX_MIN)
+#define MAX_TX_DEPTH 2
+
+#define MAX_TX_SIZE_LOG2 (6)
+#define MAX_TX_SIZE (1 << MAX_TX_SIZE_LOG2)
+#define MIN_TX_SIZE_LOG2 2
+#define MIN_TX_SIZE (1 << MIN_TX_SIZE_LOG2)
+#define MAX_TX_SQUARE (MAX_TX_SIZE * MAX_TX_SIZE)
+
+// Pad 4 extra columns to remove horizontal availability check.
+#define TX_PAD_HOR_LOG2 2
+#define TX_PAD_HOR 4
+// Pad 6 extra rows (2 on top and 4 on bottom) to remove vertical availability
+// check.
+#define TX_PAD_TOP 2
+#define TX_PAD_BOTTOM 4
+#define TX_PAD_VER (TX_PAD_TOP + TX_PAD_BOTTOM)
+// Pad 16 extra bytes to avoid reading overflow in SIMD optimization.
+#define TX_PAD_END 16
+#define TX_PAD_2D ((32 + TX_PAD_HOR) * (32 + TX_PAD_VER) + TX_PAD_END)
+
+// Number of maxium size transform blocks in the maximum size superblock
+#define MAX_TX_BLOCKS_IN_MAX_SB_LOG2 ((MAX_SB_SIZE_LOG2 - MAX_TX_SIZE_LOG2) * 2)
+#define MAX_TX_BLOCKS_IN_MAX_SB (1 << MAX_TX_BLOCKS_IN_MAX_SB_LOG2)
+
+// frame transform mode
+typedef enum ATTRIBUTE_PACKED {
+ ONLY_4X4, // use only 4x4 transform
+ TX_MODE_LARGEST, // transform size is the largest possible for pu size
+ TX_MODE_SELECT, // transform specified for each block
+ TX_MODES,
+} TX_MODE;
+
+// 1D tx types
+typedef enum ATTRIBUTE_PACKED {
+ DCT_1D,
+ ADST_1D,
+ FLIPADST_1D,
+ IDTX_1D,
+ TX_TYPES_1D,
+} TX_TYPE_1D;
+
+typedef enum ATTRIBUTE_PACKED {
+ DCT_DCT, // DCT in both horizontal and vertical
+ ADST_DCT, // ADST in vertical, DCT in horizontal
+ DCT_ADST, // DCT in vertical, ADST in horizontal
+ ADST_ADST, // ADST in both directions
+ FLIPADST_DCT,
+ DCT_FLIPADST,
+ FLIPADST_FLIPADST,
+ ADST_FLIPADST,
+ FLIPADST_ADST,
+ IDTX,
+ V_DCT,
+ H_DCT,
+ V_ADST,
+ H_ADST,
+ V_FLIPADST,
+ H_FLIPADST,
+ TX_TYPES,
+} TX_TYPE;
+
+typedef enum ATTRIBUTE_PACKED {
+ REG_REG,
+ REG_SMOOTH,
+ REG_SHARP,
+ SMOOTH_REG,
+ SMOOTH_SMOOTH,
+ SMOOTH_SHARP,
+ SHARP_REG,
+ SHARP_SMOOTH,
+ SHARP_SHARP,
+} DUAL_FILTER_TYPE;
+
+typedef enum ATTRIBUTE_PACKED {
+ // DCT only
+ EXT_TX_SET_DCTONLY,
+ // DCT + Identity only
+ EXT_TX_SET_DCT_IDTX,
+ // Discrete Trig transforms w/o flip (4) + Identity (1)
+ EXT_TX_SET_DTT4_IDTX,
+ // Discrete Trig transforms w/o flip (4) + Identity (1) + 1D Hor/vert DCT (2)
+ EXT_TX_SET_DTT4_IDTX_1DDCT,
+ // Discrete Trig transforms w/ flip (9) + Identity (1) + 1D Hor/Ver DCT (2)
+ EXT_TX_SET_DTT9_IDTX_1DDCT,
+ // Discrete Trig transforms w/ flip (9) + Identity (1) + 1D Hor/Ver (6)
+ EXT_TX_SET_ALL16,
+ EXT_TX_SET_TYPES
+} TxSetType;
+
+#define IS_2D_TRANSFORM(tx_type) (tx_type < IDTX)
+
+#define EXT_TX_SIZES 4 // number of sizes that use extended transforms
+#define EXT_TX_SETS_INTER 4 // Sets of transform selections for INTER
+#define EXT_TX_SETS_INTRA 3 // Sets of transform selections for INTRA
+
+typedef enum ATTRIBUTE_PACKED {
+ AOM_LAST_FLAG = 1 << 0,
+ AOM_LAST2_FLAG = 1 << 1,
+ AOM_LAST3_FLAG = 1 << 2,
+ AOM_GOLD_FLAG = 1 << 3,
+ AOM_BWD_FLAG = 1 << 4,
+ AOM_ALT2_FLAG = 1 << 5,
+ AOM_ALT_FLAG = 1 << 6,
+ AOM_REFFRAME_ALL = (1 << 7) - 1
+} AOM_REFFRAME;
+
+typedef enum ATTRIBUTE_PACKED {
+ UNIDIR_COMP_REFERENCE,
+ BIDIR_COMP_REFERENCE,
+ COMP_REFERENCE_TYPES,
+} COMP_REFERENCE_TYPE;
+
+typedef enum ATTRIBUTE_PACKED {
+ PLANE_TYPE_Y,
+ PLANE_TYPE_UV,
+ PLANE_TYPES
+} PLANE_TYPE;
+
+#define CFL_ALPHABET_SIZE_LOG2 4
+#define CFL_ALPHABET_SIZE (1 << CFL_ALPHABET_SIZE_LOG2)
+#define CFL_MAGS_SIZE ((2 << CFL_ALPHABET_SIZE_LOG2) + 1)
+#define CFL_IDX_U(idx) (idx >> CFL_ALPHABET_SIZE_LOG2)
+#define CFL_IDX_V(idx) (idx & (CFL_ALPHABET_SIZE - 1))
+
+typedef enum ATTRIBUTE_PACKED {
+ CFL_PRED_U,
+ CFL_PRED_V,
+ CFL_PRED_PLANES
+} CFL_PRED_TYPE;
+
+typedef enum ATTRIBUTE_PACKED {
+ CFL_SIGN_ZERO,
+ CFL_SIGN_NEG,
+ CFL_SIGN_POS,
+ CFL_SIGNS
+} CFL_SIGN_TYPE;
+
+typedef enum ATTRIBUTE_PACKED {
+ CFL_DISALLOWED,
+ CFL_ALLOWED,
+ CFL_ALLOWED_TYPES
+} CFL_ALLOWED_TYPE;
+
+// CFL_SIGN_ZERO,CFL_SIGN_ZERO is invalid
+#define CFL_JOINT_SIGNS (CFL_SIGNS * CFL_SIGNS - 1)
+// CFL_SIGN_U is equivalent to (js + 1) / 3 for js in 0 to 8
+#define CFL_SIGN_U(js) (((js + 1) * 11) >> 5)
+// CFL_SIGN_V is equivalent to (js + 1) % 3 for js in 0 to 8
+#define CFL_SIGN_V(js) ((js + 1) - CFL_SIGNS * CFL_SIGN_U(js))
+
+// There is no context when the alpha for a given plane is zero.
+// So there are 2 fewer contexts than joint signs.
+#define CFL_ALPHA_CONTEXTS (CFL_JOINT_SIGNS + 1 - CFL_SIGNS)
+#define CFL_CONTEXT_U(js) (js + 1 - CFL_SIGNS)
+// Also, the contexts are symmetric under swapping the planes.
+#define CFL_CONTEXT_V(js) \
+ (CFL_SIGN_V(js) * CFL_SIGNS + CFL_SIGN_U(js) - CFL_SIGNS)
+
+typedef enum ATTRIBUTE_PACKED {
+ PALETTE_MAP,
+ COLOR_MAP_TYPES,
+} COLOR_MAP_TYPE;
+
+typedef enum ATTRIBUTE_PACKED {
+ TWO_COLORS,
+ THREE_COLORS,
+ FOUR_COLORS,
+ FIVE_COLORS,
+ SIX_COLORS,
+ SEVEN_COLORS,
+ EIGHT_COLORS,
+ PALETTE_SIZES
+} PALETTE_SIZE;
+
+typedef enum ATTRIBUTE_PACKED {
+ PALETTE_COLOR_ONE,
+ PALETTE_COLOR_TWO,
+ PALETTE_COLOR_THREE,
+ PALETTE_COLOR_FOUR,
+ PALETTE_COLOR_FIVE,
+ PALETTE_COLOR_SIX,
+ PALETTE_COLOR_SEVEN,
+ PALETTE_COLOR_EIGHT,
+ PALETTE_COLORS
+} PALETTE_COLOR;
+
+// Note: All directional predictors must be between V_PRED and D67_PRED (both
+// inclusive).
+typedef enum ATTRIBUTE_PACKED {
+ DC_PRED, // Average of above and left pixels
+ V_PRED, // Vertical
+ H_PRED, // Horizontal
+ D45_PRED, // Directional 45 degree
+ D135_PRED, // Directional 135 degree
+ D113_PRED, // Directional 113 degree
+ D157_PRED, // Directional 157 degree
+ D203_PRED, // Directional 203 degree
+ D67_PRED, // Directional 67 degree
+ SMOOTH_PRED, // Combination of horizontal and vertical interpolation
+ SMOOTH_V_PRED, // Vertical interpolation
+ SMOOTH_H_PRED, // Horizontal interpolation
+ PAETH_PRED, // Predict from the direction of smallest gradient
+ NEARESTMV,
+ NEARMV,
+ GLOBALMV,
+ NEWMV,
+ // Compound ref compound modes
+ NEAREST_NEARESTMV,
+ NEAR_NEARMV,
+ NEAREST_NEWMV,
+ NEW_NEARESTMV,
+ NEAR_NEWMV,
+ NEW_NEARMV,
+ GLOBAL_GLOBALMV,
+ NEW_NEWMV,
+ MB_MODE_COUNT,
+ INTRA_MODE_START = DC_PRED,
+ INTRA_MODE_END = NEARESTMV,
+ INTRA_MODE_NUM = INTRA_MODE_END - INTRA_MODE_START,
+ SINGLE_INTER_MODE_START = NEARESTMV,
+ SINGLE_INTER_MODE_END = NEAREST_NEARESTMV,
+ SINGLE_INTER_MODE_NUM = SINGLE_INTER_MODE_END - SINGLE_INTER_MODE_START,
+ COMP_INTER_MODE_START = NEAREST_NEARESTMV,
+ COMP_INTER_MODE_END = MB_MODE_COUNT,
+ COMP_INTER_MODE_NUM = COMP_INTER_MODE_END - COMP_INTER_MODE_START,
+ INTER_MODE_START = NEARESTMV,
+ INTER_MODE_END = MB_MODE_COUNT,
+ INTRA_MODES = PAETH_PRED + 1, // PAETH_PRED has to be the last intra mode.
+ INTRA_INVALID = MB_MODE_COUNT // For uv_mode in inter blocks
+} PREDICTION_MODE;
+
+// TODO(ltrudeau) Do we really want to pack this?
+// TODO(ltrudeau) Do we match with PREDICTION_MODE?
+typedef enum ATTRIBUTE_PACKED {
+ UV_DC_PRED, // Average of above and left pixels
+ UV_V_PRED, // Vertical
+ UV_H_PRED, // Horizontal
+ UV_D45_PRED, // Directional 45 degree
+ UV_D135_PRED, // Directional 135 degree
+ UV_D113_PRED, // Directional 113 degree
+ UV_D157_PRED, // Directional 157 degree
+ UV_D203_PRED, // Directional 203 degree
+ UV_D67_PRED, // Directional 67 degree
+ UV_SMOOTH_PRED, // Combination of horizontal and vertical interpolation
+ UV_SMOOTH_V_PRED, // Vertical interpolation
+ UV_SMOOTH_H_PRED, // Horizontal interpolation
+ UV_PAETH_PRED, // Predict from the direction of smallest gradient
+ UV_CFL_PRED, // Chroma-from-Luma
+ UV_INTRA_MODES,
+ UV_MODE_INVALID, // For uv_mode in inter blocks
+} UV_PREDICTION_MODE;
+
+typedef enum ATTRIBUTE_PACKED {
+ SIMPLE_TRANSLATION,
+ OBMC_CAUSAL, // 2-sided OBMC
+ WARPED_CAUSAL, // 2-sided WARPED
+ MOTION_MODES
+} MOTION_MODE;
+
+typedef enum ATTRIBUTE_PACKED {
+ II_DC_PRED,
+ II_V_PRED,
+ II_H_PRED,
+ II_SMOOTH_PRED,
+ INTERINTRA_MODES
+} INTERINTRA_MODE;
+
+typedef enum ATTRIBUTE_PACKED {
+ COMPOUND_AVERAGE,
+ COMPOUND_WEDGE,
+ COMPOUND_DIFFWTD,
+ COMPOUND_TYPES,
+} COMPOUND_TYPE;
+
+typedef enum ATTRIBUTE_PACKED {
+ FILTER_DC_PRED,
+ FILTER_V_PRED,
+ FILTER_H_PRED,
+ FILTER_D157_PRED,
+ FILTER_PAETH_PRED,
+ FILTER_INTRA_MODES,
+} FILTER_INTRA_MODE;
+
+#define DIRECTIONAL_MODES 8
+#define MAX_ANGLE_DELTA 3
+#define ANGLE_STEP 3
+
+#define INTER_MODES (1 + NEWMV - NEARESTMV)
+
+#define INTER_COMPOUND_MODES (1 + NEW_NEWMV - NEAREST_NEARESTMV)
+
+#define SKIP_CONTEXTS 3
+#define SKIP_MODE_CONTEXTS 3
+
+#define COMP_INDEX_CONTEXTS 6
+#define COMP_GROUP_IDX_CONTEXTS 6
+
+#define NMV_CONTEXTS 3
+
+#define NEWMV_MODE_CONTEXTS 6
+#define GLOBALMV_MODE_CONTEXTS 2
+#define REFMV_MODE_CONTEXTS 6
+#define DRL_MODE_CONTEXTS 3
+
+#define GLOBALMV_OFFSET 3
+#define REFMV_OFFSET 4
+
+#define NEWMV_CTX_MASK ((1 << GLOBALMV_OFFSET) - 1)
+#define GLOBALMV_CTX_MASK ((1 << (REFMV_OFFSET - GLOBALMV_OFFSET)) - 1)
+#define REFMV_CTX_MASK ((1 << (8 - REFMV_OFFSET)) - 1)
+
+#define COMP_NEWMV_CTXS 5
+#define INTER_MODE_CONTEXTS 8
+
+#define DELTA_Q_SMALL 3
+#define DELTA_Q_PROBS (DELTA_Q_SMALL)
+#define DEFAULT_DELTA_Q_RES 4
+#define DELTA_LF_SMALL 3
+#define DELTA_LF_PROBS (DELTA_LF_SMALL)
+#define DEFAULT_DELTA_LF_RES 2
+
+/* Segment Feature Masks */
+#define MAX_MV_REF_CANDIDATES 2
+
+#define MAX_REF_MV_STACK_SIZE 8
+#define REF_CAT_LEVEL 640
+
+#define INTRA_INTER_CONTEXTS 4
+#define COMP_INTER_CONTEXTS 5
+#define REF_CONTEXTS 3
+
+#define COMP_REF_TYPE_CONTEXTS 5
+#define UNI_COMP_REF_CONTEXTS 3
+
+#define TXFM_PARTITION_CONTEXTS ((TX_SIZES - TX_8X8) * 6 - 3)
+typedef uint8_t TXFM_CONTEXT;
+
+#define NONE_FRAME -1
+#define INTRA_FRAME 0
+#define LAST_FRAME 1
+#define LAST2_FRAME 2
+#define LAST3_FRAME 3
+#define GOLDEN_FRAME 4
+#define BWDREF_FRAME 5
+#define ALTREF2_FRAME 6
+#define ALTREF_FRAME 7
+#define EXTREF_FRAME REF_FRAMES
+#define LAST_REF_FRAMES (LAST3_FRAME - LAST_FRAME + 1)
+
+#define INTER_REFS_PER_FRAME (ALTREF_FRAME - LAST_FRAME + 1)
+
+#define FWD_REFS (GOLDEN_FRAME - LAST_FRAME + 1)
+#define FWD_RF_OFFSET(ref) (ref - LAST_FRAME)
+#define BWD_REFS (ALTREF_FRAME - BWDREF_FRAME + 1)
+#define BWD_RF_OFFSET(ref) (ref - BWDREF_FRAME)
+
+#define SINGLE_REFS (FWD_REFS + BWD_REFS)
+
+typedef enum ATTRIBUTE_PACKED {
+ LAST_LAST2_FRAMES, // { LAST_FRAME, LAST2_FRAME }
+ LAST_LAST3_FRAMES, // { LAST_FRAME, LAST3_FRAME }
+ LAST_GOLDEN_FRAMES, // { LAST_FRAME, GOLDEN_FRAME }
+ BWDREF_ALTREF_FRAMES, // { BWDREF_FRAME, ALTREF_FRAME }
+ LAST2_LAST3_FRAMES, // { LAST2_FRAME, LAST3_FRAME }
+ LAST2_GOLDEN_FRAMES, // { LAST2_FRAME, GOLDEN_FRAME }
+ LAST3_GOLDEN_FRAMES, // { LAST3_FRAME, GOLDEN_FRAME }
+ BWDREF_ALTREF2_FRAMES, // { BWDREF_FRAME, ALTREF2_FRAME }
+ ALTREF2_ALTREF_FRAMES, // { ALTREF2_FRAME, ALTREF_FRAME }
+ TOTAL_UNIDIR_COMP_REFS,
+ // NOTE: UNIDIR_COMP_REFS is the number of uni-directional reference pairs
+ // that are explicitly signaled.
+ UNIDIR_COMP_REFS = BWDREF_ALTREF_FRAMES + 1,
+} UNIDIR_COMP_REF;
+
+#define TOTAL_COMP_REFS (FWD_REFS * BWD_REFS + TOTAL_UNIDIR_COMP_REFS)
+
+#define COMP_REFS (FWD_REFS * BWD_REFS + UNIDIR_COMP_REFS)
+
+// NOTE: A limited number of unidirectional reference pairs can be signalled for
+// compound prediction. The use of skip mode, on the other hand, makes it
+// possible to have a reference pair not listed for explicit signaling.
+#define MODE_CTX_REF_FRAMES (REF_FRAMES + TOTAL_COMP_REFS)
+
+typedef enum ATTRIBUTE_PACKED {
+ RESTORE_NONE,
+ RESTORE_WIENER,
+ RESTORE_SGRPROJ,
+ RESTORE_SWITCHABLE,
+ RESTORE_SWITCHABLE_TYPES = RESTORE_SWITCHABLE,
+ RESTORE_TYPES = 4,
+} RestorationType;
+
+#define SUPERRES_SCALE_BITS 3
+#define SUPERRES_SCALE_DENOMINATOR_MIN (SCALE_NUMERATOR + 1)
+
+// In large_scale_tile coding, external references are used.
+#define MAX_EXTERNAL_REFERENCES 128
+#define MAX_TILES 512
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_COMMON_ENUMS_H_