119 lines
2.9 KiB
C++
119 lines
2.9 KiB
C++
#ifndef TAG_PARSER_MATROSKACUES_H
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#define TAG_PARSER_MATROSKACUES_H
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#include "./ebmlelement.h"
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#include <ostream>
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#include <unordered_map>
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namespace TagParser {
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class TAG_PARSER_EXPORT MatroskaOffsetStates {
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public:
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constexpr MatroskaOffsetStates(uint64 initialValue);
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constexpr uint64 currentValue() const;
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void update(uint64 newValue);
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constexpr uint64 initialValue() const;
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private:
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uint64 m_initialValue;
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uint64 m_currentValue;
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};
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constexpr MatroskaOffsetStates::MatroskaOffsetStates(uint64 initialValue)
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: m_initialValue(initialValue)
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, m_currentValue(initialValue)
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{
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}
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constexpr uint64 MatroskaOffsetStates::currentValue() const
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{
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return m_currentValue;
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}
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inline void MatroskaOffsetStates::update(uint64 newValue)
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{
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m_currentValue = newValue;
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}
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constexpr uint64 MatroskaOffsetStates::initialValue() const
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{
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return m_initialValue;
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}
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class TAG_PARSER_EXPORT MatroskaReferenceOffsetPair : public MatroskaOffsetStates {
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public:
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constexpr MatroskaReferenceOffsetPair(uint64 referenceOffset, uint64 initialValue);
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constexpr uint64 referenceOffset() const;
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private:
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uint64 m_referenceOffset;
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};
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constexpr MatroskaReferenceOffsetPair::MatroskaReferenceOffsetPair(uint64 referenceOffset, uint64 initialValue)
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: MatroskaOffsetStates(initialValue)
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, m_referenceOffset(referenceOffset)
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{
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}
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constexpr uint64 MatroskaReferenceOffsetPair::referenceOffset() const
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{
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return m_referenceOffset;
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}
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class TAG_PARSER_EXPORT MatroskaCuePositionUpdater {
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public:
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MatroskaCuePositionUpdater();
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EbmlElement *cuesElement() const;
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uint64 totalSize() const;
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void parse(EbmlElement *cuesElement, Diagnostics &diag);
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bool updateOffsets(uint64 originalOffset, uint64 newOffset);
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bool updateRelativeOffsets(uint64 referenceOffset, uint64 originalRelativeOffset, uint64 newRelativeOffset);
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void make(std::ostream &stream, Diagnostics &diag);
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void clear();
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private:
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bool updateSize(EbmlElement *element, int shift);
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EbmlElement *m_cuesElement;
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std::unordered_map<EbmlElement *, MatroskaOffsetStates> m_offsets;
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std::unordered_map<EbmlElement *, MatroskaReferenceOffsetPair> m_relativeOffsets;
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std::unordered_map<EbmlElement *, uint64> m_sizes;
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};
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/*!
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* \brief Creates a new MatroskaCuePositionUpdater.
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*
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* The parse() method should be called to do further initialization.
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*/
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inline MatroskaCuePositionUpdater::MatroskaCuePositionUpdater()
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: m_cuesElement(nullptr)
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{
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}
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/*!
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* \brief Returns the "Cues"-element specified when calling the parse() method.
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*
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* Returns nullptr if no "Cues"-element is set.
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*/
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inline EbmlElement *MatroskaCuePositionUpdater::cuesElement() const
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{
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return m_cuesElement;
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}
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/*!
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* \brief Resets the object to its initial state. Parsing results and updates are cleared.
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*/
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inline void MatroskaCuePositionUpdater::clear()
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{
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m_cuesElement = nullptr;
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m_offsets.clear();
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m_sizes.clear();
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}
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} // namespace TagParser
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#endif // TAG_PARSER_MATROSKACUES_H
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