AVFormatContext.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/buffer/consumer.hxx>
#include <StormByte/multimedia/ffmpeg/AVPointer.hxx>
#include <StormByte/multimedia/ffmpeg/fwd.hxx>
#include <StormByte/multimedia/ffmpeg/typedefs.hxx>
 
#include <chrono>
#include <filesystem>
#include <memory>
#include <optional>
#include <unordered_set>
 
namespace StormByte::Multimedia::Backend::Pipeline {
    class Demuxer;
}

namespace StormByte::Multimedia::FFmpeg {
    class AVBSF;
    class AVCodecParameters;
    class AVPacket;
    class AVStream;

    class STORMBYTE_MULTIMEDIA_PUBLIC AVFormatContext: public AVPointer<::AVFormatContext> {
        friend class StormByte::Multimedia::Backend::Pipeline::Demuxer;
 
        public:
            AVFormatContext(const AVFormatContext& other) = delete;

            AVFormatContext(AVFormatContext&& other) noexcept;

            ~AVFormatContext() noexcept override;

            AVFormatContext& operator=(const AVFormatContext& other) = delete;

            AVFormatContext& operator=(AVFormatContext&& other) noexcept;

            static ExpectedAVFormatContext Open(const std::filesystem::path& path);

            static ExpectedAVFormatContext Open(StormByte::Buffer::Consumer consumer);

            const char* FormatName() const noexcept;

            const char* Tag(const char* key) const noexcept;

            std::optional<std::chrono::nanoseconds> Duration() const noexcept;

            OperationResult ReadPacket(AVPacket& packet) noexcept;

            Streams Streams() const noexcept;

            std::optional<AVBSF> Mp4ToAnnexB(int codec_id, int stream_id, const AVCodecParameters& params) const noexcept;

            explicit operator bool() const noexcept;

            void DiscardUnwanted(const std::unordered_set<int>& wanted) noexcept;
 
        private:
            struct ConsumerIO;
 
            std::unique_ptr<ConsumerIO> m_io;   

            explicit AVFormatContext(::AVFormatContext* ctx, std::unique_ptr<ConsumerIO> io) noexcept;

            void HarvestSideData() noexcept;

            OperationResult SeekStart() noexcept;

            void Free() noexcept override;
 
            using AVPointer<::AVFormatContext>::Get;
    };
 
    extern template class STORMBYTE_MULTIMEDIA_PUBLIC AVPointer<::AVFormatContext>;
}