registry.hxx

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/*
 * Copyright (C) 2024-2026 David C. Manuelda (StormBytePP)
 *
 * This file is part of StormByte-Multimedia.
 *
 * StormByte-Multimedia original source is dual-licensed:
 *
 * 1. GNU Lesser General Public License v3.0 (or later)
 *    You may redistribute and/or modify this file under the terms of the
 *    GNU Lesser General Public License as published by the Free Software
 *    Foundation, either version 3 of the License, or (at your option)
 *    any later version.
 *
 * 2. Commercial license
 *    Alternatively, this file may be used under the terms of a commercial
 *    license agreement with the copyright holder
 *    (David C. Manuelda <StormByte@gmail.com>).
 *
 * Both licenses apply only to original StormByte-Multimedia source in this
 * file. Third-party components — including FFmpeg and embedded trained data —
 * remain under their own licenses and are not covered by the commercial grant.
 *
 * Neither license grants any patent rights. Any patent licenses required
 * to use this software or third-party components must be obtained separately
 * from the patent holders.
 *
 * StormByte-Multimedia 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
 * version 3 along with StormByte-Multimedia. If not, see
 * <https://www.gnu.org/licenses/lgpl-3.0.html>.
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-StormByte-Commercial
 */
 
#pragma once
 
#include <StormByte/multimedia/codec.hxx>
#include <StormByte/multimedia/container.hxx>
#include <StormByte/multimedia/typedefs.hxx>
 
#include <functional>
#include <span>
#include <string_view>
#include <unordered_map>
#include <vector>
 
namespace StormByte::Multimedia::Tables {
    namespace Codec {
        struct CodecDef;
    }
    namespace Container {
        struct ContainerDef;
    }
}
 
namespace StormByte::Multimedia {
    class STORMBYTE_MULTIMEDIA_PUBLIC Registry {
        public:
            Registry(const Registry&) = delete;
 
            Registry(Registry&&) = delete;
 
            ~Registry() noexcept = default;
 
            Registry& operator=(const Registry&) = delete;
 
            Registry& operator=(Registry&&) = delete;
 
            static Registry& Instance() noexcept;
 
            CodecRefs CodecList(Type type) const noexcept;
 
            ContainerRefs ContainerList() const noexcept;
 
            ExpectedCodec FindCodec(std::string_view name) const noexcept;
 
            ExpectedContainer FindContainer(std::string_view name) const noexcept;
 
        private:
            struct NameHash {
                using is_transparent = void;    
 
                std::size_t operator()(std::string_view view) const noexcept {
                    return std::hash<std::string_view>{}(view);
                }
            };
 
            Registry() noexcept;
 
            void Initialize() noexcept;
 
            void Load() noexcept;
 
            void LoadCodecs() noexcept;
 
            void LoadCodecs(Type type, std::span<const Tables::Codec::CodecDef> table) noexcept;
 
            void Add(Type type, const Tables::Codec::CodecDef& def) noexcept;
 
            void LoadContainers() noexcept;
 
            void Add(const Tables::Container::ContainerDef& def) noexcept;
 
            Access ProbeContainer(const Tables::Container::ContainerDef& def) const noexcept;
 
            std::vector<Codec> m_codecs;    
            std::unordered_map<std::string_view, std::size_t, NameHash, std::equal_to<>> m_by_name; 
            std::unordered_map<Type, std::vector<std::size_t>> m_by_type;   
            std::vector<Container> m_containers;    
            std::unordered_map<std::string_view, std::size_t, NameHash, std::equal_to<>> m_container_by_name;   
    };
}