82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
#ifndef TAG_PARSER_MPEG4DESCRIPTOR_H
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#define TAG_PARSER_MPEG4DESCRIPTOR_H
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#include "../genericfileelement.h"
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#include <memory>
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namespace TagParser {
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class Mp4Container;
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class Mpeg4Descriptor;
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/*!
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* \brief Defines traits for the GenericFileElement implementation Mpeg4Descriptor.
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*/
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template <> class TAG_PARSER_EXPORT FileElementTraits<Mpeg4Descriptor> {
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public:
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using ContainerType = Mp4Container;
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using IdentifierType = std::uint8_t;
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using DataSizeType = std::uint32_t;
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/*!
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* \brief Returns the minimal descriptor size which is 2 byte.
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*/
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static constexpr std::uint8_t minimumElementSize()
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{
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return 2;
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}
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};
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class TAG_PARSER_EXPORT Mpeg4Descriptor : public GenericFileElement<Mpeg4Descriptor> {
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friend class GenericFileElement<Mpeg4Descriptor>;
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public:
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Mpeg4Descriptor(ContainerType &container, std::uint64_t startOffset, std::uint64_t maxSize);
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std::string idToString() const;
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bool isParent() const;
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bool isPadding() const;
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std::uint64_t firstChildOffset() const;
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protected:
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Mpeg4Descriptor(Mpeg4Descriptor &parent, std::uint64_t startOffset);
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void internalParse(Diagnostics &diag);
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private:
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std::string parsingContext() const;
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};
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/*!
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* \brief Returns an indication whether the descriptor contains sub descriptors.
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*
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* \remarks Returns true if a first child has been denoted (via denoteFirstChild()).
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*/
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inline bool Mpeg4Descriptor::isParent() const
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{
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return m_firstChild != nullptr;
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}
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/*!
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* \brief Returns always false for MPEG-4 descriptors.
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*/
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inline bool Mpeg4Descriptor::isPadding() const
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{
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return false;
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}
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/*!
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* \brief Returns the offset of the first child (relative to the start offset of this descriptor).
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*
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* \remarks The first child must be denoted (via denoteFirstChild()).
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*/
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inline std::uint64_t Mpeg4Descriptor::firstChildOffset() const
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{
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return firstChild() ? firstChild()->startOffset() - startOffset() : 0;
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}
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} // namespace TagParser
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#endif // TAG_PARSER_MPEG4DESCRIPTOR_H
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