demuxer.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/fifo.hxx>
#include <StormByte/logger/log.hxx>
#include <StormByte/multimedia/file.hxx>
#include <StormByte/multimedia/pipeline/packet.hxx>
#include <StormByte/multimedia/pipeline/progress.hxx>
#include <StormByte/multimedia/pipeline/step.hxx>
#include <StormByte/multimedia/property/duration.hxx>
#include <StormByte/multimedia/type.hxx>
#include <StormByte/multimedia/visibility.h>
 
#include <atomic>
#include <condition_variable>
#include <cstdint>
#include <memory>
#include <mutex>
#include <optional>
#include <unordered_map>
#include <vector>

namespace StormByte::Multimedia::Backend::Pipeline {
    class Decoder;  
    class Demuxer;  
}
 
namespace StormByte::Multimedia::Backend::Pipeline::Detail::Worker {
    class Demux;
}

namespace StormByte::Multimedia {
    class Origin;
}

namespace StormByte::Multimedia::Pipeline {
    class Decoder;
    class Demuxer;
    class Filters;
    class Muxer;
    class Packet;
    class Plan;
    class Remuxer;

    STORMBYTE_MULTIMEDIA_PUBLIC Decoder& operator>>(Demuxer& demuxer, Decoder& decoder) noexcept;

    class STORMBYTE_MULTIMEDIA_PUBLIC Demuxer final: public Step {
        friend class Backend::Pipeline::Demuxer;
        friend class Backend::Pipeline::Detail::Worker::Demux;
        friend class Decoder;
        friend class Filters;
        friend class Muxer;
        friend Decoder& operator>>(Demuxer& demuxer, Decoder& decoder) noexcept;
        friend Demuxer& operator>>(class Plan&& plan, Demuxer& demuxer) noexcept;
        friend Muxer& operator>>(Demuxer& demuxer, Muxer& muxer) noexcept;
        friend Remuxer& operator>>(Demuxer& demuxer, Remuxer& remuxer) noexcept;
 
        public:

            explicit Demuxer(std::shared_ptr<StormByte::Logger::Log> log) noexcept;

            Demuxer(const Demuxer& other) = delete;

            Demuxer(Demuxer&& other) noexcept = delete;

            ~Demuxer() noexcept override;

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

            Demuxer& operator=(Demuxer&& other) noexcept = delete;


            explicit operator bool() const noexcept;


            bool Eof() const noexcept;

            std::optional<Property::Duration> Position() const noexcept;

            Progress::Pointer Progress() const noexcept;

 
        private:
            using Step::Log;

            void WaitForPlan() noexcept;

            void LatchDuration() noexcept;

            void ReachedEof() noexcept;

            void Measure(std::vector<int> tracks) noexcept;

            bool Measuring() const noexcept;

            bool WakeNow() const noexcept override;

            bool Rewind() noexcept;

            const File& OriginFile() const noexcept;

            Origin& BoundOrigin() noexcept;

            std::unique_ptr<Backend::Pipeline::Decoder> OpenDecoder(Decoder& decoder) noexcept;

            Packet::PointerType Wrap(
                int track,
                Type type,
                StormByte::Buffer::FIFO payload,
                std::optional<Property::Duration> pts,
                std::optional<Property::Duration> dts,
                std::optional<Property::Duration> duration,
                bool keyframe,
                std::unique_ptr<Backend::Pipeline::Packet> backend) noexcept;
 
            std::unique_ptr<Backend::Pipeline::Demuxer> m_backend;  
            bool m_eof;                                             
            std::mutex m_planMutex;                                 
            std::condition_variable m_planPresent;                  
            std::atomic<std::int64_t> m_positionNs;                 
            std::unordered_map<int, std::uint64_t> m_nextSerial;    
            std::vector<int> m_measureTracks;                       
            bool m_measuring = false;                               
            Filters* m_filters = nullptr;                           
            std::shared_ptr<class Progress> m_progress;             
            Join m_join{*this};                                     
    };
}