FFmpeg/libavcodec/evc_ps.h

/*
 * 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
 */

/**
 * @file
 * EVC decoder/parser shared code
 */

#ifndef AVCODEC_EVC_PS_H
#define AVCODEC_EVC_PS_H

#include <stdint.h>

#include "evc.h"
#include "get_bits.h"

#define EVC_MAX_QP_TABLE_SIZE   58
#define NUM_CPB                 32

// rpl structure
typedef struct RefPicListStruct {
    uint32_t ref_pic_num;
    uint32_t ref_pics[EVC_MAX_NUM_REF_PICS];
} RefPicListStruct;

// chromaQP table structure to be signalled in SPS
typedef struct ChromaQpTable {
    uint8_t chroma_qp_table_present_flag;            // u(1)
    uint8_t same_qp_table_for_chroma;                // u(1)
    uint8_t global_offset_flag;                      // u(1)
    uint8_t num_points_in_qp_table_minus1[2];        // ue(v)
    uint8_t delta_qp_in_val_minus1[2][EVC_MAX_QP_TABLE_SIZE]; // u(6)
    int delta_qp_out_val[2][EVC_MAX_QP_TABLE_SIZE];         // se(v)
} ChromaQpTable;

// Hypothetical Reference Decoder (HRD) parameters, part of VUI
typedef struct HRDParameters {
    uint8_t cpb_cnt_minus1;                          // ue(v)
    uint8_t bit_rate_scale;                          // u(4)
    uint8_t cpb_size_scale;                          // u(4)
    uint32_t bit_rate_value_minus1[NUM_CPB];         // ue(v)
    uint32_t cpb_size_value_minus1[NUM_CPB];         // ue(v)
    uint8_t cbr_flag[NUM_CPB];                       // u(1)
    uint8_t initial_cpb_removal_delay_length_minus1; // u(5)
    uint8_t cpb_removal_delay_length_minus1;         // u(5)
    uint8_t dpb_output_delay_length_minus1;          // u(5)
    uint8_t time_offset_length;                      // u(5)
} HRDParameters;

// video usability information (VUI) part of SPS
typedef struct VUIParameters {
    uint8_t aspect_ratio_info_present_flag;          // u(1)
    uint8_t aspect_ratio_idc;                        // u(8)
    uint16_t sar_width;                              // u(16)
    uint16_t sar_height;                             // u(16)
    uint8_t overscan_info_present_flag;              // u(1)
    uint8_t overscan_appropriate_flag;               // u(1)
    uint8_t video_signal_type_present_flag;          // u(1)
    uint8_t video_format;                            // u(3)
    uint8_t video_full_range_flag;                   // u(1)
    uint8_t colour_description_present_flag;         // u(1)
    uint8_t colour_primaries;                        // u(8)
    uint8_t transfer_characteristics;                // u(8)
    uint8_t matrix_coefficients;                     // u(8)
    uint8_t chroma_loc_info_present_flag;            // u(1)
    uint8_t chroma_sample_loc_type_top_field;        // ue(v)
    uint8_t chroma_sample_loc_type_bottom_field;     // ue(v)
    uint8_t neutral_chroma_indication_flag;          // u(1)
    uint8_t field_seq_flag;                          // u(1)
    uint8_t timing_info_present_flag;                // u(1)
    uint32_t num_units_in_tick;                      // u(32)
    uint32_t time_scale;                             // u(32)
    uint8_t fixed_pic_rate_flag;                     // u(1)
    uint8_t nal_hrd_parameters_present_flag;         // u(1)
    uint8_t vcl_hrd_parameters_present_flag;         // u(1)
    uint8_t low_delay_hrd_flag;                      // u(1)
    uint8_t pic_struct_present_flag;                 // u(1)
    uint8_t bitstream_restriction_flag;              // u(1)
    uint8_t motion_vectors_over_pic_boundaries_flag; // u(1)
    uint8_t max_bytes_per_pic_denom;                 // ue(v)
    uint8_t max_bits_per_mb_denom;                   // ue(v)
    uint8_t log2_max_mv_length_horizontal;           // ue(v)
    uint8_t log2_max_mv_length_vertical;             // ue(v)
    uint32_t num_reorder_pics;                       // ue(v)
    uint32_t max_dec_pic_buffering;                  // ue(v)

    HRDParameters hrd_parameters;
} VUIParameters;

// The sturcture reflects SPS RBSP(raw byte sequence payload) layout
// @see ISO_IEC_23094-1 section 7.3.2.1
//
// The following descriptors specify the parsing process of each element
// u(n) - unsigned integer using n bits
// ue(v) - unsigned integer 0-th order Exp_Golomb-coded syntax element with the left bit first
typedef struct EVCParserSPS {
    uint8_t sps_seq_parameter_set_id;                // ue(v)
    uint8_t profile_idc;                             // u(8)
    uint8_t level_idc;                               // u(8)
    uint32_t toolset_idc_h;                          // u(32)
    uint32_t toolset_idc_l;                          // u(32)
    uint8_t chroma_format_idc;                       // ue(v)
    uint32_t pic_width_in_luma_samples;              // ue(v)
    uint32_t pic_height_in_luma_samples;             // ue(v)
    uint8_t bit_depth_luma_minus8;                  // ue(v)
    uint8_t bit_depth_chroma_minus8;                // ue(v)

    uint8_t sps_btt_flag;                            // u(1)
    uint32_t log2_ctu_size_minus2;                   // ue(v)
    uint32_t log2_min_cb_size_minus2;                // ue(v)
    uint32_t log2_diff_ctu_max_14_cb_size;           // ue(v)
    uint32_t log2_diff_ctu_max_tt_cb_size;           // ue(v)
    uint32_t log2_diff_min_cb_min_tt_cb_size_minus2; // ue(v)

    uint8_t sps_suco_flag;                           // u(1)
    uint32_t log2_diff_ctu_size_max_suco_cb_size;    // ue(v)
    uint32_t log2_diff_max_suco_min_suco_cb_size;    // ue(v)

    uint8_t sps_admvp_flag;                          // u(1)
    uint8_t sps_affine_flag;                         // u(1)
    uint8_t sps_amvr_flag;                           // u(1)
    uint8_t sps_dmvr_flag;                           // u(1)
    uint8_t sps_mmvd_flag;                           // u(1)
    uint8_t sps_hmvp_flag;                           // u(1)

    uint8_t sps_eipd_flag;                           // u(1)
    uint8_t sps_ibc_flag;                            // u(1)
    uint32_t log2_max_ibc_cand_size_minus2;          // ue(v)

    uint8_t sps_cm_init_flag;                        // u(1)
    uint8_t sps_adcc_flag;                           // u(1)

    uint8_t sps_iqt_flag;                            // u(1)
    uint8_t sps_ats_flag;                            // u(1)

    uint8_t sps_addb_flag;                           // u(1)
    uint8_t sps_alf_flag;                            // u(1)
    uint8_t sps_htdf_flag;                           // u(1)
    uint8_t sps_rpl_flag;                            // u(1)
    uint8_t sps_pocs_flag;                           // u(1)
    uint8_t sps_dquant_flag;                         // u(1)
    uint8_t sps_dra_flag;                            // u(1)

    uint32_t log2_max_pic_order_cnt_lsb_minus4;      // ue(v)
    uint32_t log2_sub_gop_length;                    // ue(v)
    uint32_t log2_ref_pic_gap_length;                // ue(v)

    uint8_t max_num_tid0_ref_pics;                   // ue(v)

    uint32_t sps_max_dec_pic_buffering_minus1;       // ue(v)
    uint8_t long_term_ref_pic_flag;                  // u(1)
    uint8_t rpl1_same_as_rpl0_flag;                  // u(1)
    uint8_t num_ref_pic_list_in_sps[2];             // ue(v)
    struct RefPicListStruct rpls[2][EVC_MAX_NUM_RPLS];

    uint8_t picture_cropping_flag;                   // u(1)
    uint32_t picture_crop_left_offset;               // ue(v)
    uint32_t picture_crop_right_offset;              // ue(v)
    uint32_t picture_crop_top_offset;                // ue(v)
    uint32_t picture_crop_bottom_offset;             // ue(v)

    struct ChromaQpTable chroma_qp_table_struct;

    uint8_t vui_parameters_present_flag;             // u(1)

    struct VUIParameters vui_parameters;

} EVCParserSPS;

typedef struct EVCParserPPS {
    uint8_t pps_pic_parameter_set_id;                              // ue(v)
    uint8_t pps_seq_parameter_set_id;                              // ue(v)
    uint8_t num_ref_idx_default_active_minus1[2];                  // ue(v)
    uint8_t additional_lt_poc_lsb_len;                             // ue(v)
    uint8_t rpl1_idx_present_flag;                                 // u(1)
    uint8_t single_tile_in_pic_flag;                               // u(1)
    uint32_t num_tile_columns_minus1;                              // ue(v)
    uint32_t num_tile_rows_minus1;                                 // ue(v)
    uint8_t uniform_tile_spacing_flag;                             // u(1)
    uint32_t tile_column_width_minus1[EVC_MAX_TILE_ROWS];          // ue(v)
    uint32_t tile_row_height_minus1[EVC_MAX_TILE_COLUMNS];         // ue(v)
    uint8_t loop_filter_across_tiles_enabled_flag;                 // u(1)
    uint32_t tile_offset_len_minus1;                               // ue(v)
    uint8_t tile_id_len_minus1;                                    // ue(v)
    uint8_t explicit_tile_id_flag;                                 // u(1)
    uint32_t tile_id_val[EVC_MAX_TILE_ROWS][EVC_MAX_TILE_COLUMNS]; // u(v)
    uint8_t pic_dra_enabled_flag;                                  // u(1)
    uint8_t pic_dra_aps_id;                                        // u(5)
    uint8_t arbitrary_slice_present_flag;                          // u(1)
    uint8_t constrained_intra_pred_flag;                           // u(1)
    uint8_t cu_qp_delta_enabled_flag;                              // u(1)
    uint32_t log2_cu_qp_delta_area_minus6;                         // ue(v)

} EVCParserPPS;

typedef struct EVCParamSets {
    EVCParserSPS *sps[EVC_MAX_SPS_COUNT];
    EVCParserPPS *pps[EVC_MAX_PPS_COUNT];
} EVCParamSets;

// @see ISO_IEC_23094-1 (7.3.2.1 SPS RBSP syntax)
int ff_evc_parse_sps(GetBitContext *gb, EVCParamSets *ps);

// @see ISO_IEC_23094-1 (7.3.2.2 SPS RBSP syntax)
int ff_evc_parse_pps(GetBitContext *gb, EVCParamSets *ps);

void ff_evc_ps_free(EVCParamSets *ps);

#endif /* AVCODEC_EVC_PS_H */