FFmpeg/libavcodec/hevc_ps.h

/*
 * HEVC parameter set parsing
 *
 * 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_HEVC_PS_H
#define AVCODEC_HEVC_PS_H

#include <stdint.h>

#include "libavutil/buffer.h"
#include "libavutil/pixfmt.h"
#include "libavutil/rational.h"

#include "avcodec.h"
#include "get_bits.h"
#include "hevc.h"

typedef struct ShortTermRPS {
    unsigned int num_negative_pics;
    int num_delta_pocs;
    int rps_idx_num_delta_pocs;
    int32_t delta_poc[32];
    uint8_t used[32];
} ShortTermRPS;

typedef struct LongTermRPS {
    int     poc[32];
    uint8_t used[32];
    uint8_t nb_refs;
} LongTermRPS;

typedef struct SliceHeader {
    unsigned int pps_id;

    ///< address (in raster order) of the first block in the current slice segment
    unsigned int   slice_segment_addr;
    ///< address (in raster order) of the first block in the current slice
    unsigned int   slice_addr;

    enum HEVCSliceType slice_type;

    int pic_order_cnt_lsb;

    uint8_t first_slice_in_pic_flag;
    uint8_t dependent_slice_segment_flag;
    uint8_t pic_output_flag;
    uint8_t colour_plane_id;

    ///< RPS coded in the slice header itself is stored here
    int short_term_ref_pic_set_sps_flag;
    int short_term_ref_pic_set_size;
    ShortTermRPS slice_rps;
    const ShortTermRPS *short_term_rps;
    int long_term_ref_pic_set_size;
    LongTermRPS long_term_rps;
    unsigned int list_entry_lx[2][32];

    uint8_t rpl_modification_flag[2];
    uint8_t no_output_of_prior_pics_flag;
    uint8_t slice_temporal_mvp_enabled_flag;

    unsigned int nb_refs[2];

    uint8_t slice_sample_adaptive_offset_flag[3];
    uint8_t mvd_l1_zero_flag;

    uint8_t cabac_init_flag;
    uint8_t disable_deblocking_filter_flag; ///< slice_header_disable_deblocking_filter_flag
    uint8_t slice_loop_filter_across_slices_enabled_flag;
    uint8_t collocated_list;

    unsigned int collocated_ref_idx;

    int slice_qp_delta;
    int slice_cb_qp_offset;
    int slice_cr_qp_offset;

    uint8_t cu_chroma_qp_offset_enabled_flag;

    int beta_offset;    ///< beta_offset_div2 * 2
    int tc_offset;      ///< tc_offset_div2 * 2

    unsigned int max_num_merge_cand; ///< 5 - 5_minus_max_num_merge_cand

    unsigned *entry_point_offset;
    int * offset;
    int * size;
    int num_entry_point_offsets;

    int8_t slice_qp;

    uint8_t luma_log2_weight_denom;
    int16_t chroma_log2_weight_denom;

    int16_t luma_weight_l0[16];
    int16_t chroma_weight_l0[16][2];
    int16_t chroma_weight_l1[16][2];
    int16_t luma_weight_l1[16];

    int16_t luma_offset_l0[16];
    int16_t chroma_offset_l0[16][2];

    int16_t luma_offset_l1[16];
    int16_t chroma_offset_l1[16][2];

    int slice_ctb_addr_rs;
} SliceHeader;

typedef struct HEVCWindow {
    unsigned int left_offset;
    unsigned int right_offset;
    unsigned int top_offset;
    unsigned int bottom_offset;
} HEVCWindow;

typedef struct VUI {
    AVRational sar;

    int overscan_info_present_flag;
    int overscan_appropriate_flag;

    int video_signal_type_present_flag;
    int video_format;
    int video_full_range_flag;
    int colour_description_present_flag;
    uint8_t colour_primaries;
    uint8_t transfer_characteristic;
    uint8_t matrix_coeffs;

    int chroma_loc_info_present_flag;
    int chroma_sample_loc_type_top_field;
    int chroma_sample_loc_type_bottom_field;
    int neutra_chroma_indication_flag;

    int field_seq_flag;
    int frame_field_info_present_flag;

    int default_display_window_flag;
    HEVCWindow def_disp_win;

    int vui_timing_info_present_flag;
    uint32_t vui_num_units_in_tick;
    uint32_t vui_time_scale;
    int vui_poc_proportional_to_timing_flag;
    int vui_num_ticks_poc_diff_one_minus1;
    int vui_hrd_parameters_present_flag;

    int bitstream_restriction_flag;
    int tiles_fixed_structure_flag;
    int motion_vectors_over_pic_boundaries_flag;
    int restricted_ref_pic_lists_flag;
    int min_spatial_segmentation_idc;
    int max_bytes_per_pic_denom;
    int max_bits_per_min_cu_denom;
    int log2_max_mv_length_horizontal;
    int log2_max_mv_length_vertical;
} VUI;

typedef struct PTLCommon {
    uint8_t profile_space;
    uint8_t tier_flag;
    uint8_t profile_idc;
    uint8_t profile_compatibility_flag[32];
    uint8_t level_idc;
    uint8_t progressive_source_flag;
    uint8_t interlaced_source_flag;
    uint8_t non_packed_constraint_flag;
    uint8_t frame_only_constraint_flag;
} PTLCommon;

typedef struct PTL {
    PTLCommon general_ptl;
    PTLCommon sub_layer_ptl[HEVC_MAX_SUB_LAYERS];

    uint8_t sub_layer_profile_present_flag[HEVC_MAX_SUB_LAYERS];
    uint8_t sub_layer_level_present_flag[HEVC_MAX_SUB_LAYERS];
} PTL;

typedef struct HEVCVPS {
    uint8_t vps_temporal_id_nesting_flag;
    int vps_max_layers;
    int vps_max_sub_layers; ///< vps_max_temporal_layers_minus1 + 1

    PTL ptl;
    int vps_sub_layer_ordering_info_present_flag;
    unsigned int vps_max_dec_pic_buffering[HEVC_MAX_SUB_LAYERS];
    unsigned int vps_num_reorder_pics[HEVC_MAX_SUB_LAYERS];
    unsigned int vps_max_latency_increase[HEVC_MAX_SUB_LAYERS];
    int vps_max_layer_id;
    int vps_num_layer_sets; ///< vps_num_layer_sets_minus1 + 1
    uint8_t vps_timing_info_present_flag;
    uint32_t vps_num_units_in_tick;
    uint32_t vps_time_scale;
    uint8_t vps_poc_proportional_to_timing_flag;
    int vps_num_ticks_poc_diff_one; ///< vps_num_ticks_poc_diff_one_minus1 + 1
    int vps_num_hrd_parameters;

    uint8_t data[4096];
    int data_size;
} HEVCVPS;

typedef struct ScalingList {
    /* This is a little wasteful, since sizeID 0 only needs 8 coeffs,
     * and size ID 3 only has 2 arrays, not 6. */
    uint8_t sl[4][6][64];
    uint8_t sl_dc[2][6];
} ScalingList;

typedef struct HEVCSPS {
    unsigned vps_id;
    int chroma_format_idc;
    uint8_t separate_colour_plane_flag;

    HEVCWindow output_window;

    HEVCWindow pic_conf_win;

    int bit_depth;
    int pixel_shift;
    enum AVPixelFormat pix_fmt;

    unsigned int log2_max_poc_lsb;
    int pcm_enabled_flag;

    int max_sub_layers;
    struct {
        int max_dec_pic_buffering;
        int num_reorder_pics;
        int max_latency_increase;
    } temporal_layer[HEVC_MAX_SUB_LAYERS];

    VUI vui;
    PTL ptl;

    uint8_t scaling_list_enable_flag;
    ScalingList scaling_list;

    unsigned int nb_st_rps;
    ShortTermRPS st_rps[HEVC_MAX_SHORT_TERM_RPS_COUNT];

    uint8_t amp_enabled_flag;
    uint8_t sao_enabled;

    uint8_t long_term_ref_pics_present_flag;
    uint16_t lt_ref_pic_poc_lsb_sps[32];
    uint8_t used_by_curr_pic_lt_sps_flag[32];
    uint8_t num_long_term_ref_pics_sps;

    struct {
        uint8_t bit_depth;
        uint8_t bit_depth_chroma;
        unsigned int log2_min_pcm_cb_size;
        unsigned int log2_max_pcm_cb_size;
        uint8_t loop_filter_disable_flag;
    } pcm;
    uint8_t sps_temporal_mvp_enabled_flag;
    uint8_t sps_strong_intra_smoothing_enable_flag;

    unsigned int log2_min_cb_size;
    unsigned int log2_diff_max_min_coding_block_size;
    unsigned int log2_min_tb_size;
    unsigned int log2_max_trafo_size;
    unsigned int log2_ctb_size;
    unsigned int log2_min_pu_size;

    int max_transform_hierarchy_depth_inter;
    int max_transform_hierarchy_depth_intra;

    int transform_skip_rotation_enabled_flag;
    int transform_skip_context_enabled_flag;
    int implicit_rdpcm_enabled_flag;
    int explicit_rdpcm_enabled_flag;
    int intra_smoothing_disabled_flag;
    int persistent_rice_adaptation_enabled_flag;

    ///< coded frame dimension in various units
    int width;
    int height;
    int ctb_width;
    int ctb_height;
    int ctb_size;
    int min_cb_width;
    int min_cb_height;
    int min_tb_width;
    int min_tb_height;
    int min_pu_width;
    int min_pu_height;
    int tb_mask;

    int hshift[3];
    int vshift[3];

    int qp_bd_offset;

    uint8_t data[4096];
    int data_size;
} HEVCSPS;

typedef struct HEVCPPS {
    unsigned int sps_id; ///< seq_parameter_set_id

    uint8_t sign_data_hiding_flag;

    uint8_t cabac_init_present_flag;

    int num_ref_idx_l0_default_active; ///< num_ref_idx_l0_default_active_minus1 + 1
    int num_ref_idx_l1_default_active; ///< num_ref_idx_l1_default_active_minus1 + 1
    int pic_init_qp_minus26;

    uint8_t constrained_intra_pred_flag;
    uint8_t transform_skip_enabled_flag;

    uint8_t cu_qp_delta_enabled_flag;
    int diff_cu_qp_delta_depth;

    int cb_qp_offset;
    int cr_qp_offset;
    uint8_t pic_slice_level_chroma_qp_offsets_present_flag;
    uint8_t weighted_pred_flag;
    uint8_t weighted_bipred_flag;
    uint8_t output_flag_present_flag;
    uint8_t transquant_bypass_enable_flag;

    uint8_t dependent_slice_segments_enabled_flag;
    uint8_t tiles_enabled_flag;
    uint8_t entropy_coding_sync_enabled_flag;

    int num_tile_columns;   ///< num_tile_columns_minus1 + 1
    int num_tile_rows;      ///< num_tile_rows_minus1 + 1
    uint8_t uniform_spacing_flag;
    uint8_t loop_filter_across_tiles_enabled_flag;

    uint8_t seq_loop_filter_across_slices_enabled_flag;

    uint8_t deblocking_filter_control_present_flag;
    uint8_t deblocking_filter_override_enabled_flag;
    uint8_t disable_dbf;
    int beta_offset;    ///< beta_offset_div2 * 2
    int tc_offset;      ///< tc_offset_div2 * 2

    uint8_t scaling_list_data_present_flag;
    ScalingList scaling_list;

    uint8_t lists_modification_present_flag;
    int log2_parallel_merge_level; ///< log2_parallel_merge_level_minus2 + 2
    int num_extra_slice_header_bits;
    uint8_t slice_header_extension_present_flag;
    uint8_t log2_max_transform_skip_block_size;
    uint8_t cross_component_prediction_enabled_flag;
    uint8_t chroma_qp_offset_list_enabled_flag;
    uint8_t diff_cu_chroma_qp_offset_depth;
    uint8_t chroma_qp_offset_list_len_minus1;
    int8_t  cb_qp_offset_list[5];
    int8_t  cr_qp_offset_list[5];
    uint8_t log2_sao_offset_scale_luma;
    uint8_t log2_sao_offset_scale_chroma;

    // Inferred parameters
    unsigned int *column_width;  ///< ColumnWidth
    unsigned int *row_height;    ///< RowHeight
    unsigned int *col_bd;        ///< ColBd
    unsigned int *row_bd;        ///< RowBd
    int *col_idxX;

    int *ctb_addr_rs_to_ts; ///< CtbAddrRSToTS
    int *ctb_addr_ts_to_rs; ///< CtbAddrTSToRS
    int *tile_id;           ///< TileId
    int *tile_pos_rs;       ///< TilePosRS
    int *min_tb_addr_zs;    ///< MinTbAddrZS
    int *min_tb_addr_zs_tab;///< MinTbAddrZS

    uint8_t data[4096];
    int data_size;
} HEVCPPS;

typedef struct HEVCParamSets {
    AVBufferRef *vps_list[HEVC_MAX_VPS_COUNT];
    AVBufferRef *sps_list[HEVC_MAX_SPS_COUNT];
    AVBufferRef *pps_list[HEVC_MAX_PPS_COUNT];

    /* currently active parameter sets */
    const HEVCVPS *vps;
    const HEVCSPS *sps;
    const HEVCPPS *pps;
} HEVCParamSets;

/**
 * Parse the SPS from the bitstream into the provided HEVCSPS struct.
 *
 * @param sps_id the SPS id will be written here
 * @param apply_defdispwin if set 1, the default display window from the VUI
 *                         will be applied to the video dimensions
 * @param vps_list if non-NULL, this function will validate that the SPS refers
 *                 to an existing VPS
 */
int ff_hevc_parse_sps(HEVCSPS *sps, GetBitContext *gb, unsigned int *sps_id,
                      int apply_defdispwin, AVBufferRef **vps_list, AVCodecContext *avctx);

int ff_hevc_decode_nal_vps(GetBitContext *gb, AVCodecContext *avctx,
                           HEVCParamSets *ps);
int ff_hevc_decode_nal_sps(GetBitContext *gb, AVCodecContext *avctx,
                           HEVCParamSets *ps, int apply_defdispwin);
int ff_hevc_decode_nal_pps(GetBitContext *gb, AVCodecContext *avctx,
                           HEVCParamSets *ps);

int ff_hevc_decode_short_term_rps(GetBitContext *gb, AVCodecContext *avctx,
                                  ShortTermRPS *rps, const HEVCSPS *sps, int is_slice_header);

int ff_hevc_encode_nal_vps(HEVCVPS *vps, unsigned int id,
                           uint8_t *buf, int buf_size);

/**
 * Compute POC of the current frame and return it.
 */
int ff_hevc_compute_poc(const HEVCSPS *sps, int pocTid0, int poc_lsb, int nal_unit_type);

#endif /* AVCODEC_HEVC_PS_H */