atlas_context.hpp

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#pragma once
 
 
#include "atlas_frame.hpp"
#include "bitstream_common.hpp"
#include "bitstream_util.hpp"
#include "uvgvpcc/uvgvpcc.hpp"
 
/* Atlas context is used to hold the atlas data (inside V3C_AD unit) of a single GOF */
class atlas_context {
   public:
    atlas_context() : asps_(), afps_(), atlas_data_(), gof_id_(), atlas_sub_size_(0), ad_nal_sizes_({}), ad_nal_precision_(0) {};
 
    /* Fill data structures with encoded data from gofUVG and sequence parameters from paramUVG */
    void initialize_atlas_context(const std::shared_ptr<uvgvpcc_enc::GOF>& gofUVG, const uvgvpcc_enc::Parameters& paramUVG);
 
    /* Write the atlas sub-bitstream */
    void write_atlas_sub_bitstream(bitstream_t* stream);
 
    /* Write ASPS and AFPS nal units */
    void write_atlas_parameter_set_nals(bitstream_t* stream);
    /* Write an atlas NAL unit at index */
    void write_atlas_nal(bitstream_t* stream, size_t index);
 
    /* Write an atlas NAL unit at index */
    void write_atlas_eob(bitstream_t* stream);
 
    // -------------- Getters - data structures --------------
    std::vector<atlas_tile_layer_rbsp>& get_atlases() { return atlas_data_; };
    atlas_sequence_parameter_set& get_asps() { return asps_; };
    atlas_frame_parameter_set& get_afps() { return afps_; };
 
    // -------------- Getters - helper variables --------------
    size_t get_gof_id() { return gof_id_; };
    size_t get_atlas_sub_size() { return atlas_sub_size_; };
    std::vector<size_t> get_ad_nal_sizes() { return ad_nal_sizes_; };
    size_t get_ad_nal_precision() { return ad_nal_precision_; };
 
   private:
    /* Calculate sizes of
        atlas sub-bitstream             = atlas_sub_size_
        atlas NAL units                 = ad_nal_sizes_
        atlas NAL unit precision        = ad_nal_precision_ */
    void calculate_atlas_size_values();
 
    // -------------- Functions to fill data structure values --------------
    static atlas_sequence_parameter_set create_atlas_sequence_parameter_set(const std::shared_ptr<uvgvpcc_enc::GOF>& gofUVG,
                                                                            const uvgvpcc_enc::Parameters& paramUVG);
    atlas_frame_parameter_set create_atlas_frame_parameter_set();
    atlas_frame_tile_information create_atlas_frame_tile_information() const;
    atlas_tile_header create_atlas_tile_header(size_t frameIndex, size_t tileIndex, const uvgvpcc_enc::Parameters& paramUVG) const;
    atlas_tile_data_unit create_atlas_tile_data_unit(const uvgvpcc_enc::Parameters& paramUVG, const uvgvpcc_enc::Frame& frameUVG,
                                                     atlas_tile_header& ath) const;
    atlas_tile_layer_rbsp create_atlas_tile_layer_rbsp(size_t frameIndex, size_t tileIndex, const uvgvpcc_enc::Parameters& paramUVG,
                                                       const uvgvpcc_enc::Frame& frameUVG);
 
    // -------------- Functions to write data structures to bitstream --------------
    static void write_nal_hdr(bitstream_t* stream, const uint8_t nal_type, const uint8_t nal_layer_id, const uint8_t nal_temporal_id_plus1);
    void write_atlas_seq_parameter_set(bitstream_t* stream);
    static void write_atlas_adaption_parameter_set(bitstream_t* stream);
    void write_atlas_frame_parameter_set(bitstream_t* stream) const;
    void write_atlas_tile_header(bitstream_t* stream, NAL_UNIT_TYPE nalu_t, const atlas_tile_header& ath) const;
    void write_atlas_tile_data_unit(bitstream_t* stream, const atlas_tile_data_unit& atdu, const atlas_tile_header& ath);
    void write_atlas_tile_layer_rbsp(bitstream_t* stream, NAL_UNIT_TYPE nalu_t, const atlas_tile_layer_rbsp& rbsp);
    void write_access_unit_delimiter(bitstream_t* stream);
 
    void write_patch_information_data(bitstream_t* stream, const patch_information_data& pid, const atlas_tile_header& ath);
    void write_patch_data_unit(bitstream_t* stream, const patch_data_unit& pdu, const atlas_tile_header& ath) const;
 
    /* -------------- Atlas data structures -------------- */
    atlas_sequence_parameter_set asps_;
    atlas_frame_parameter_set afps_;
    std::vector<atlas_tile_layer_rbsp> atlas_data_;
 
    /* -------------- Helper variables -------------- */
    size_t gof_id_;
    size_t atlas_sub_size_;
    std::vector<size_t> ad_nal_sizes_;
    size_t ad_nal_precision_;
};