146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
#ifndef EBMLELEMENT_H
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#define EBMLELEMENT_H
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#include "./ebmlid.h"
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#include "./matroskaid.h"
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#include "../statusprovider.h"
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#include "../genericfileelement.h"
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#include <c++utilities/conversion/types.h>
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#include <iostream>
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#include <memory>
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#include <string>
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#include <sstream>
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namespace Media {
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class EbmlElement;
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class MatroskaContainer;
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/*!
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* \brief Defines traits for the GenericFileElement implementation EbmlElement.
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*/
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template <>
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class LIB_EXPORT FileElementTraits<EbmlElement>
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{
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public:
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/*!
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* \brief The container type used to store such elements is MatroskaContainer.
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*/
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typedef MatroskaContainer containerType;
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/*!
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* \brief The type used to store element IDs is an unsigned 32-bit integer.
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*/
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typedef uint32 identifierType;
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/*!
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* \brief The type used to store element sizes is an unsigned 64-bit integer.
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*/
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typedef uint64 dataSizeType;
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/*!
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* \brief The implementation type is EbmlElement.
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*/
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typedef EbmlElement implementationType;
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};
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class LIB_EXPORT EbmlElement : public GenericFileElement<EbmlElement>
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{
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friend class GenericFileElement<EbmlElement>;
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public:
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EbmlElement(MatroskaContainer &container, uint64 startOffset);
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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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uint64 firstChildOffset() const;
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std::string readString();
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uint64 readUInteger();
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float64 readFloat();
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static byte calculateIdLength(identifierType id);
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static byte calculateSizeDenotationLength(uint64 size);
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static byte makeId(identifierType id, char *buff);
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static byte makeSizeDenotation(uint64 size, char *buff);
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static byte calculateUIntegerLength(uint64 integer);
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static byte makeUInteger(uint64 value, char *buff);
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static void makeSimpleElement(std::ostream &stream, identifierType id, uint64 content);
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static void makeSimpleElement(std::ostream &stream, identifierType id, const std::string &content);
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protected:
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EbmlElement(EbmlElement &parent, uint64 startOffset);
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EbmlElement(MatroskaContainer &container, uint64 startOffset, uint64 maxSize);
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void internalParse();
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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 Converts the specified EBML \a ID to a printable string.
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*/
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inline std::string EbmlElement::idToString() const
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{
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std::stringstream ss;
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ss << "0x" << std::hex << id();
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const char *name = matroskaIdName(id());
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if(std::char_traits<char>::length(name)) {
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ss << " \"" << name << "\"";
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}
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return ss.str();
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}
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/*!
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* \brief Returns an indication whether the element is a parent element.
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* \remarks This information is not read from the element header. Some
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* elements are simply known to be parents whereas all other
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* are considered as non-parents.
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*/
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inline bool EbmlElement::isParent() const
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{
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using namespace EbmlIds;
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using namespace MatroskaIds;
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switch(id()) {
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case Header:
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case SignatureSlot: case SignatureElements: case SignatureElementList:
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case Segment: case SeekHead: case Seek:
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case SegmentInfo: case ChapterTranslate:
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case Cluster: case SilentTracks: case BlockGroup: case BlockAdditions: case BlockMore: case Slices: case TimeSlice: case ReferenceFrame:
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case Tracks: case TrackEntry: case TrackTranslate: case TrackVideo: case TrackAudio: case TrackOperation: case TrackCombinePlanes: case TrackPlane: case TrackJoinBlocks:
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case ContentEncodings: case ContentEncoding: case ContentCompression: case ContentEncryption:
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case Cues: case CuePoint: case CueTrackPositions: case CueReference:
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case Attachments: case AttachedFile:
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case Chapters: case EditionEntry: case ChapterAtom: case ChapterTrack: case ChapterDisplay: case ChapProcess: case ChapProcessCommand:
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case Tags: case MatroskaIds::Tag: case Targets: case SimpleTag:
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return true;
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default:
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return false;
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}
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}
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/*!
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* \brief Returns an indication whether the element is considered as padding.
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*/
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inline bool EbmlElement::isPadding() const
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{
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return id() == EbmlIds::Void;
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}
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/*!
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* \brief Returns the offset of the first child of the element.
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*/
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inline uint64 EbmlElement::firstChildOffset() const
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{
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return isParent() ? (idLength() + sizeLength()) : 0;
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}
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}
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#endif // EBMLELEMENT_H
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