asfvideo.hpp

// SPDX-License-Identifier: GPL-2.0-or-later
// Spec : Advanced Systems Format (ASF) Specification : Revision 01.20.05 :
// https://exse.eyewated.com/fls/54b3ed95bbfb1a92.pdf
#pragma once
 
// *****************************************************************************
#include <array>
#include "exiv2lib_export.h"
 
// included header files
#include "image.hpp"
 
// *****************************************************************************
// namespace extensions
namespace Exiv2 {
 
// *****************************************************************************
// class definitions
 
class EXIV2API AsfVideo : public Image {
 public:
 
 
  explicit AsfVideo(BasicIo::UniquePtr io);
 
 
  void readMetadata() override;
  void writeMetadata() override;
 
 
  [[nodiscard]] std::string mimeType() const override;
 
  /* @class GUID_struct
   *
   * @brief A class to represent a globally unique identifier (GUID) structure
   *
   * This class represents a globally unique identifier (GUID) structure which is used to identify objects in a
   * distributed environment. A GUID is a unique identifier that is generated on a computer and can be used to
   * identify an object across different systems. The GUID structure is comprised of four 32-bit values and an
   * array of 8 bytes.
   *
   * @note The byte order of the GUID structure is in little endian.
   *
   * @see https://en.wikipedia.org/wiki/Globally_unique_identifier
   *
   */
  class GUIDTag {
    uint32_t data1_;
    uint16_t data2_;
    uint16_t data3_;
    std::array<byte, 8> data4_;
 
   public:
    bool operator==(const GUIDTag& other) const;
 
    // Constructor to create a GUID object by passing individual values for each attribute
    GUIDTag(unsigned int data1, unsigned short data2, unsigned short data3, std::array<byte, 8> data4);
 
    // Constructor to create a GUID object from a byte array
    explicit GUIDTag(const uint8_t* bytes);
 
    std::string to_string();
 
    bool operator<(const GUIDTag& other) const;
  };
 
 private:
  static constexpr size_t CODEC_TYPE_VIDEO = 1;
  static constexpr size_t CODEC_TYPE_AUDIO = 2;
 
  class HeaderReader {
    DataBuf IdBuf_;
    uint64_t size_{};
    uint64_t remaining_size_{};
 
   public:
    explicit HeaderReader(const BasicIo::UniquePtr& io);
 
    [[nodiscard]] uint64_t getSize() const {
      return size_;
    }
 
    [[nodiscard]] uint64_t getRemainingSize() const {
      return remaining_size_;
    }
 
    [[nodiscard]] DataBuf& getId() {
      return IdBuf_;
    }
  };
 
 protected:
  void decodeBlock();
 
  void decodeHeader();
  void fileProperties();
  void streamProperties();
  void codecList();
  void contentDescription();
  void extendedStreamProperties();
  void headerExtension() const;
  void extendedContentDescription();
 
  void DegradableJPEGMedia();
 
 private:
  uint64_t height_{};
  uint64_t width_{};
 
};  // Class AsfVideo
 
// *****************************************************************************
// template, inline and free functions
 
// These could be static private functions on Image subclasses but then
// ImageFactory needs to be made a friend.
EXIV2API Image::UniquePtr newAsfInstance(BasicIo::UniquePtr io, bool create);
 
EXIV2API bool isAsfType(BasicIo& iIo, bool advance);
}  // namespace Exiv2