/*

 * HEVC video decoder

 *

 * Copyright (C) 2012 - 2013 Guillaume Martres

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#ifndef AVCODEC_HEVCDEC_H

#define AVCODEC_HEVCDEC_H

#include <stdatomic.h>

#include "libavutil/buffer.h"

#include "libavutil/md5.h"

#include "avcodec.h"

#include "bswapdsp.h"

#include "cabac.h"

#include "get_bits.h"

#include "hevcpred.h"

#include "h2645_parse.h"

#include "hevc.h"

#include "hevc_ps.h"

#include "hevc_sei.h"

#include "hevcdsp.h"

#include "internal.h"

#include "thread.h"

#include "videodsp.h"

#define MAX_NB_THREADS 16

#define SHIFT_CTB_WPP 2

//TODO: check if this is really the maximum

#define MAX_TRANSFORM_DEPTH 5

#define MAX_TB_SIZE 32

#define MAX_QP 51

#define DEFAULT_INTRA_TC_OFFSET 2

#define HEVC_CONTEXTS 199

#define MRG_MAX_NUM_CANDS     5

#define L0 0

#define L1 1

#define EPEL_EXTRA_BEFORE 1

#define EPEL_EXTRA_AFTER  2

#define EPEL_EXTRA        3

#define QPEL_EXTRA_BEFORE 3

#define QPEL_EXTRA_AFTER  4

#define QPEL_EXTRA        7

#define EDGE_EMU_BUFFER_STRIDE 80

/**

 * Value of the luma sample at position (x, y) in the 2D array tab.

 */

#define SAMPLE(tab, x, y) ((tab)[(y) * s->sps->width + (x)])

#define SAMPLE_CTB(tab, x, y) ((tab)[(y) * min_cb_width + (x)])

#define IS_IDR(s) ((s)->nal_unit_type == HEVC_NAL_IDR_W_RADL || (s)->nal_unit_type == HEVC_NAL_IDR_N_LP)

#define IS_BLA(s) ((s)->nal_unit_type == HEVC_NAL_BLA_W_RADL || (s)->nal_unit_type == HEVC_NAL_BLA_W_LP || \

                   (s)->nal_unit_type == HEVC_NAL_BLA_N_LP)

#define IS_IRAP(s) ((s)->nal_unit_type >= 16 && (s)->nal_unit_type <= 23)

enum RPSType {

    ST_CURR_BEF = 0,

    ST_CURR_AFT,

    ST_FOLL,

    LT_CURR,

    LT_FOLL,

    NB_RPS_TYPE,

};

enum SyntaxElement {

    SAO_MERGE_FLAG = 0,

    SAO_TYPE_IDX,

    SAO_EO_CLASS,

    SAO_BAND_POSITION,

    SAO_OFFSET_ABS,

    SAO_OFFSET_SIGN,

    END_OF_SLICE_FLAG,

    SPLIT_CODING_UNIT_FLAG,

    CU_TRANSQUANT_BYPASS_FLAG,

    SKIP_FLAG,

    CU_QP_DELTA,

    PRED_MODE_FLAG,

    PART_MODE,

    PCM_FLAG,

    PREV_INTRA_LUMA_PRED_FLAG,

    MPM_IDX,

    REM_INTRA_LUMA_PRED_MODE,

    INTRA_CHROMA_PRED_MODE,

    MERGE_FLAG,

    MERGE_IDX,

    INTER_PRED_IDC,

    REF_IDX_L0,

    REF_IDX_L1,

    ABS_MVD_GREATER0_FLAG,

    ABS_MVD_GREATER1_FLAG,

    ABS_MVD_MINUS2,

    MVD_SIGN_FLAG,

    MVP_LX_FLAG,

    NO_RESIDUAL_DATA_FLAG,

    SPLIT_TRANSFORM_FLAG,

    CBF_LUMA,

    CBF_CB_CR,

    TRANSFORM_SKIP_FLAG,

    EXPLICIT_RDPCM_FLAG,

    EXPLICIT_RDPCM_DIR_FLAG,

    LAST_SIGNIFICANT_COEFF_X_PREFIX,

    LAST_SIGNIFICANT_COEFF_Y_PREFIX,

    LAST_SIGNIFICANT_COEFF_X_SUFFIX,

    LAST_SIGNIFICANT_COEFF_Y_SUFFIX,

    SIGNIFICANT_COEFF_GROUP_FLAG,

    SIGNIFICANT_COEFF_FLAG,

    COEFF_ABS_LEVEL_GREATER1_FLAG,

    COEFF_ABS_LEVEL_GREATER2_FLAG,

    COEFF_ABS_LEVEL_REMAINING,

    COEFF_SIGN_FLAG,

    LOG2_RES_SCALE_ABS,

    RES_SCALE_SIGN_FLAG,

    CU_CHROMA_QP_OFFSET_FLAG,

    CU_CHROMA_QP_OFFSET_IDX,

};

enum PartMode {

    PART_2Nx2N = 0,

    PART_2NxN  = 1,

    PART_Nx2N  = 2,

    PART_NxN   = 3,

    PART_2NxnU = 4,

    PART_2NxnD = 5,

    PART_nLx2N = 6,

    PART_nRx2N = 7,

};

enum PredMode {

    MODE_INTER = 0,

    MODE_INTRA,

    MODE_SKIP,

};

enum InterPredIdc {

    PRED_L0 = 0,

    PRED_L1,

    PRED_BI,

};

enum PredFlag {

    PF_INTRA = 0,

    PF_L0,

    PF_L1,

    PF_BI,

};

enum IntraPredMode {

    INTRA_PLANAR = 0,

    INTRA_DC,

    INTRA_ANGULAR_2,

    INTRA_ANGULAR_3,

    INTRA_ANGULAR_4,

    INTRA_ANGULAR_5,

    INTRA_ANGULAR_6,

    INTRA_ANGULAR_7,

    INTRA_ANGULAR_8,

    INTRA_ANGULAR_9,

    INTRA_ANGULAR_10,

    INTRA_ANGULAR_11,

    INTRA_ANGULAR_12,

    INTRA_ANGULAR_13,

    INTRA_ANGULAR_14,

    INTRA_ANGULAR_15,

    INTRA_ANGULAR_16,

    INTRA_ANGULAR_17,

    INTRA_ANGULAR_18,

    INTRA_ANGULAR_19,

    INTRA_ANGULAR_20,

    INTRA_ANGULAR_21,

    INTRA_ANGULAR_22,

    INTRA_ANGULAR_23,

    INTRA_ANGULAR_24,

    INTRA_ANGULAR_25,

    INTRA_ANGULAR_26,

    INTRA_ANGULAR_27,

    INTRA_ANGULAR_28,

    INTRA_ANGULAR_29,

    INTRA_ANGULAR_30,

    INTRA_ANGULAR_31,

    INTRA_ANGULAR_32,

    INTRA_ANGULAR_33,

    INTRA_ANGULAR_34,

};

enum SAOType {

    SAO_NOT_APPLIED = 0,

    SAO_BAND,

    SAO_EDGE,

    SAO_APPLIED

};

enum SAOEOClass {

    SAO_EO_HORIZ = 0,

    SAO_EO_VERT,

    SAO_EO_135D,

    SAO_EO_45D,

};

enum ScanType {

    SCAN_DIAG = 0,

    SCAN_HORIZ,

    SCAN_VERT,

};

typedef struct RefPicList {

    struct HEVCFrame *ref[HEVC_MAX_REFS];

    int list[HEVC_MAX_REFS];

    int isLongTerm[HEVC_MAX_REFS];

    int nb_refs;

} RefPicList;

typedef struct RefPicListTab {

    RefPicList refPicList[2];

} RefPicListTab;

typedef struct CodingUnit {

    int x;

    int y;

    enum PredMode pred_mode;    ///< PredMode

    enum PartMode part_mode;    ///< PartMode

    // Inferred parameters

    uint8_t intra_split_flag;   ///< IntraSplitFlag

    uint8_t max_trafo_depth;    ///< MaxTrafoDepth

    uint8_t cu_transquant_bypass_flag;

} CodingUnit;

typedef struct Mv {

    int16_t x;  ///< horizontal component of motion vector

    int16_t y;  ///< vertical component of motion vector

} Mv;

typedef struct MvField {

    DECLARE_ALIGNED(4, Mv, mv)[2];

    int8_t ref_idx[2];

    int8_t pred_flag;

} MvField;

typedef struct NeighbourAvailable {

    int cand_bottom_left;

    int cand_left;

    int cand_up;

    int cand_up_left;

    int cand_up_right;

    int cand_up_right_sap;

} NeighbourAvailable;

typedef struct PredictionUnit {

    int mpm_idx;

    int rem_intra_luma_pred_mode;

    uint8_t intra_pred_mode[4];

    Mv mvd;

    uint8_t merge_flag;

    uint8_t intra_pred_mode_c[4];

    uint8_t chroma_mode_c[4];

} PredictionUnit;

typedef struct TransformUnit {

    int cu_qp_delta;

    int res_scale_val;

    // Inferred parameters;

    int intra_pred_mode;

    int intra_pred_mode_c;

    int chroma_mode_c;

    uint8_t is_cu_qp_delta_coded;

    uint8_t is_cu_chroma_qp_offset_coded;

    int8_t  cu_qp_offset_cb;

    int8_t  cu_qp_offset_cr;

    uint8_t cross_pf;

} TransformUnit;

typedef struct DBParams {

    int beta_offset;

    int tc_offset;

} DBParams;

#define HEVC_FRAME_FLAG_OUTPUT    (1 << 0)

#define HEVC_FRAME_FLAG_SHORT_REF (1 << 1)

#define HEVC_FRAME_FLAG_LONG_REF  (1 << 2)

#define HEVC_FRAME_FLAG_BUMPING   (1 << 3)

typedef struct HEVCFrame {

    AVFrame *frame;

    ThreadFrame tf;

    MvField *tab_mvf;

    RefPicList *refPicList;

    RefPicListTab **rpl_tab;

    int ctb_count;

    int poc;

    struct HEVCFrame *collocated_ref;

    AVBufferRef *tab_mvf_buf;

    AVBufferRef *rpl_tab_buf;

    AVBufferRef *rpl_buf;

    AVBufferRef *hwaccel_priv_buf;

    void *hwaccel_picture_private;

    /**

     * A sequence counter, so that old frames are output first

     * after a POC reset

     */

    uint16_t sequence;

    /**

     * A combination of HEVC_FRAME_FLAG_*

     */

    uint8_t flags;

} HEVCFrame;

typedef struct HEVCLocalContext {

    uint8_t cabac_state[HEVC_CONTEXTS];

    uint8_t stat_coeff[4];

    uint8_t first_qp_group;

    GetBitContext gb;

    CABACContext cc;

    int8_t qp_y;

    int8_t curr_qp_y;

    int qPy_pred;

    TransformUnit tu;

    uint8_t ctb_left_flag;

    uint8_t ctb_up_flag;

    uint8_t ctb_up_right_flag;

    uint8_t ctb_up_left_flag;

    int     end_of_tiles_x;

    int     end_of_tiles_y;

    /* +7 is for subpixel interpolation, *2 for high bit depths */

    DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2];

    /* The extended size between the new edge emu buffer is abused by SAO */

    DECLARE_ALIGNED(32, uint8_t, edge_emu_buffer2)[(MAX_PB_SIZE + 7) * EDGE_EMU_BUFFER_STRIDE * 2];

    DECLARE_ALIGNED(32, int16_t, tmp)[MAX_PB_SIZE * MAX_PB_SIZE];

    int ct_depth;

    CodingUnit cu;

    PredictionUnit pu;

    NeighbourAvailable na;

#define BOUNDARY_LEFT_SLICE     (1 << 0)

#define BOUNDARY_LEFT_TILE      (1 << 1)

#define BOUNDARY_UPPER_SLICE    (1 << 2)

#define BOUNDARY_UPPER_TILE     (1 << 3)

    /* properties of the boundary of the current CTB for the purposes

     * of the deblocking filter */

    int boundary_flags;

} HEVCLocalContext;

typedef struct HEVCContext {

    const AVClass *c;  // needed by private avoptions

    AVCodecContext *avctx;

    struct HEVCContext  *sList[MAX_NB_THREADS];

    HEVCLocalContext    *HEVClcList[MAX_NB_THREADS];

    HEVCLocalContext    *HEVClc;

    uint8_t             threads_type;

    uint8_t             threads_number;

    int                 width;

    int                 height;

    uint8_t *cabac_state;

    /** 1 if the independent slice segment header was successfully parsed */

    uint8_t slice_initialized;

    AVFrame *frame;

    AVFrame *output_frame;

    uint8_t *sao_pixel_buffer_h[3];

    uint8_t *sao_pixel_buffer_v[3];

    HEVCParamSets ps;

    HEVCSEI sei;

    struct AVMD5 *md5_ctx;

    AVBufferPool *tab_mvf_pool;

    AVBufferPool *rpl_tab_pool;

    ///< candidate references for the current frame

    RefPicList rps[5];

    SliceHeader sh;

    SAOParams *sao;

    DBParams *deblock;

    enum HEVCNALUnitType nal_unit_type;

    int temporal_id;  ///< temporal_id_plus1 - 1

    HEVCFrame *ref;

    HEVCFrame DPB[32];

    int poc;

    int pocTid0;

    int slice_idx; ///< number of the slice being currently decoded

    int eos;       ///< current packet contains an EOS/EOB NAL

    int last_eos;  ///< last packet contains an EOS/EOB NAL

    int max_ra;

    int bs_width;

    int bs_height;

    int overlap;

    int is_decoded;

    int no_rasl_output_flag;

    HEVCPredContext hpc;

    HEVCDSPContext hevcdsp;

    VideoDSPContext vdsp;

    BswapDSPContext bdsp;

    int8_t *qp_y_tab;

    uint8_t *horizontal_bs;

    uint8_t *vertical_bs;

    int32_t *tab_slice_address;

    //  CU

    uint8_t *skip_flag;

    uint8_t *tab_ct_depth;

    // PU

    uint8_t *tab_ipm;

    uint8_t *cbf_luma; // cbf_luma of colocated TU

    uint8_t *is_pcm;

    // CTB-level flags affecting loop filter operation

    uint8_t *filter_slice_edges;

    /** used on BE to byteswap the lines for checksumming */

    uint8_t *checksum_buf;

    int      checksum_buf_size;

    /**

     * Sequence counters for decoded and output frames, so that old

     * frames are output first after a POC reset

     */

    uint16_t seq_decode;

    uint16_t seq_output;

    int enable_parallel_tiles;

    atomic_int wpp_err;

    const uint8_t *data;

    H2645Packet pkt;

    // type of the first VCL NAL of the current frame

    enum HEVCNALUnitType first_nal_type;

    uint8_t context_initialized;

    int is_nalff;           ///< this flag is != 0 if bitstream is encapsulated

                            ///< as a format defined in 14496-15

    int apply_defdispwin;

    int nal_length_size;    ///< Number of bytes used for nal length (1, 2 or 4)

    int nuh_layer_id;

} HEVCContext;

/**

 * Mark all frames in DPB as unused for reference.

 */

void ff_hevc_clear_refs(HEVCContext *s);

/**

 * Drop all frames currently in DPB.

 */

void ff_hevc_flush_dpb(HEVCContext *s);

RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *frame,

                                 int x0, int y0);

/**

 * Construct the reference picture sets for the current frame.

 */

int ff_hevc_frame_rps(HEVCContext *s);

/**

 * Construct the reference picture list(s) for the current slice.

 */

int ff_hevc_slice_rpl(HEVCContext *s);

void ff_hevc_save_states(HEVCContext *s, int ctb_addr_ts);

int ff_hevc_cabac_init(HEVCContext *s, int ctb_addr_ts);

int ff_hevc_sao_merge_flag_decode(HEVCContext *s);

int ff_hevc_sao_type_idx_decode(HEVCContext *s);

int ff_hevc_sao_band_position_decode(HEVCContext *s);

int ff_hevc_sao_offset_abs_decode(HEVCContext *s);

int ff_hevc_sao_offset_sign_decode(HEVCContext *s);

int ff_hevc_sao_eo_class_decode(HEVCContext *s);

int ff_hevc_end_of_slice_flag_decode(HEVCContext *s);

int ff_hevc_cu_transquant_bypass_flag_decode(HEVCContext *s);

int ff_hevc_skip_flag_decode(HEVCContext *s, int x0, int y0,

                             int x_cb, int y_cb);

int ff_hevc_pred_mode_decode(HEVCContext *s);

int ff_hevc_split_coding_unit_flag_decode(HEVCContext *s, int ct_depth,

                                          int x0, int y0);

int ff_hevc_part_mode_decode(HEVCContext *s, int log2_cb_size);

int ff_hevc_pcm_flag_decode(HEVCContext *s);

int ff_hevc_prev_intra_luma_pred_flag_decode(HEVCContext *s);

int ff_hevc_mpm_idx_decode(HEVCContext *s);

int ff_hevc_rem_intra_luma_pred_mode_decode(HEVCContext *s);

int ff_hevc_intra_chroma_pred_mode_decode(HEVCContext *s);

int ff_hevc_merge_idx_decode(HEVCContext *s);

int ff_hevc_merge_flag_decode(HEVCContext *s);

int ff_hevc_inter_pred_idc_decode(HEVCContext *s, int nPbW, int nPbH);

int ff_hevc_ref_idx_lx_decode(HEVCContext *s, int num_ref_idx_lx);

int ff_hevc_mvp_lx_flag_decode(HEVCContext *s);

int ff_hevc_no_residual_syntax_flag_decode(HEVCContext *s);

int ff_hevc_split_transform_flag_decode(HEVCContext *s, int log2_trafo_size);

int ff_hevc_cbf_cb_cr_decode(HEVCContext *s, int trafo_depth);

int ff_hevc_cbf_luma_decode(HEVCContext *s, int trafo_depth);

int ff_hevc_log2_res_scale_abs(HEVCContext *s, int idx);

int ff_hevc_res_scale_sign_flag(HEVCContext *s, int idx);

/**

 * Get the number of candidate references for the current frame.

 */

int ff_hevc_frame_nb_refs(const HEVCContext *s);

int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc);

{

    case HEVC_NAL_TSA_N:

    case HEVC_NAL_STSA_N:

    case HEVC_NAL_RADL_N:

    case HEVC_NAL_RASL_N:

    case HEVC_NAL_VCL_N10:

    case HEVC_NAL_VCL_N12:

    case HEVC_NAL_VCL_N14:

    }

}

/**

 * Find next frame in output order and put a reference to it in frame.

 * @return 1 if a frame was output, 0 otherwise

 */

int ff_hevc_output_frame(HEVCContext *s, AVFrame *frame, int flush);

void ff_hevc_bump_frame(HEVCContext *s);

void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags);

void ff_hevc_set_neighbour_available(HEVCContext *s, int x0, int y0,

                                     int nPbW, int nPbH);

void ff_hevc_luma_mv_merge_mode(HEVCContext *s, int x0, int y0,

                                int nPbW, int nPbH, int log2_cb_size,

                                int part_idx, int merge_idx, MvField *mv);

void ff_hevc_luma_mv_mvp_mode(HEVCContext *s, int x0, int y0,

                              int nPbW, int nPbH, int log2_cb_size,

                              int part_idx, int merge_idx,

                              MvField *mv, int mvp_lx_flag, int LX);

void ff_hevc_set_qPy(HEVCContext *s, int xBase, int yBase,

                     int log2_cb_size);

void ff_hevc_deblocking_boundary_strengths(HEVCContext *s, int x0, int y0,

                                           int log2_trafo_size);

int ff_hevc_cu_qp_delta_sign_flag(HEVCContext *s);

int ff_hevc_cu_qp_delta_abs(HEVCContext *s);

int ff_hevc_cu_chroma_qp_offset_flag(HEVCContext *s);

int ff_hevc_cu_chroma_qp_offset_idx(HEVCContext *s);

void ff_hevc_hls_filter(HEVCContext *s, int x, int y, int ctb_size);

void ff_hevc_hls_filters(HEVCContext *s, int x_ctb, int y_ctb, int ctb_size);

void ff_hevc_hls_residual_coding(HEVCContext *s, int x0, int y0,

                                 int log2_trafo_size, enum ScanType scan_idx,

                                 int c_idx);

void ff_hevc_hls_mvd_coding(HEVCContext *s, int x0, int y0, int log2_cb_size);

extern const uint8_t ff_hevc_qpel_extra_before[4];

extern const uint8_t ff_hevc_qpel_extra_after[4];

extern const uint8_t ff_hevc_qpel_extra[4];

#endif /* AVCODEC_HEVCDEC_H */