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Diffstat (limited to 'source/XMPFiles/FormatSupport/MOOV_Support.hpp')
| -rw-r--r-- | source/XMPFiles/FormatSupport/MOOV_Support.hpp | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/source/XMPFiles/FormatSupport/MOOV_Support.hpp b/source/XMPFiles/FormatSupport/MOOV_Support.hpp new file mode 100644 index 0000000..3e19a9d --- /dev/null +++ b/source/XMPFiles/FormatSupport/MOOV_Support.hpp @@ -0,0 +1,215 @@ +#ifndef __MOOV_Support_hpp__ +#define __MOOV_Support_hpp__ 1 + +// ================================================================================================= +// ADOBE SYSTEMS INCORPORATED +// Copyright 2009 Adobe Systems Incorporated +// All Rights Reserved +// +// NOTICE: Adobe permits you to use, modify, and distribute this file in accordance with the terms +// of the Adobe license agreement accompanying it. +// ================================================================================================= + +#include "XMP_Environment.h" // ! This must be the first include. + +#include <vector> + +#include "XMP_Const.h" +#include "XMPFiles_Impl.hpp" +#include "EndianUtils.hpp" + +typedef vector<XMP_Uns8> RawDataBlock; + +#define moovBoxSizeLimit 100*1024*1024 + +// ================================================================================================= +// MOOV_Manager +// ============ + +class MOOV_Manager { +public: + + // --------------------------------------------------------------------------------------------- + // Types and constants + + enum { // Values for fileMode. + kFileIsNormalISO = 0, // A "normal" MPEG-4 file, no 'qt ' compatible brand. + kFileIsModernQT = 1, // Has an 'ftyp' box and 'qt ' compatible brand. + kFileIsTraditionalQT = 2 // Old QuickTime, no 'ftyp' box. + }; + + typedef const void * BoxRef; // Valid until a sibling or higher box is added or deleted. + + struct BoxInfo { + XMP_Uns32 boxType; // In memory as native endian, compares work with ISOMedia::k_* constants. + XMP_Uns32 childCount; // ! A 'meta' box has both content (version/flags) and children! + XMP_Uns32 contentSize; // Does not include the size of nested boxes. + const XMP_Uns8 * content; // Null if contentSize is zero. + BoxInfo() : boxType(0), childCount(0), contentSize(0), content(0) {}; + }; + + // --------------------------------------------------------------------------------------------- + // GetBox - Pick a box given a '/' separated list of box types. Picks the 1st of each type. + // GetNthChild - Pick the overall n-th child of the parent, zero based. + // GetTypeChild - Pick the first child of the given type. + // GetParsedOffset - Get the box's offset in the parsed tree, 0 if changed since parsing. + // GetHeaderSize - Get the box's header size in the parsed tree, 0 if changed since parsing. + + BoxRef GetBox ( const char * boxPath, BoxInfo * info ) const; + + BoxRef GetNthChild ( BoxRef parentRef, size_t childIndex, BoxInfo * info ) const; + BoxRef GetTypeChild ( BoxRef parentRef, XMP_Uns32 childType, BoxInfo * info ) const; + + XMP_Uns32 GetParsedOffset ( BoxRef ref ) const; + XMP_Uns32 GetHeaderSize ( BoxRef ref ) const; + + // --------------------------------------------------------------------------------------------- + // NoteChange - Note overall change, value was directly replaced. + // SetBox(ref) - Replace the content with a copy of the given data. + // SetBox(path) - Like above, but creating path to the box if necessary. + // AddChildBox - Add a child of the given type, using a copy of the given data (may be null) + + void NoteChange(); + + void SetBox ( BoxRef theBox, const void* dataPtr, XMP_Uns32 size ); + void SetBox ( const char * boxPath, const void* dataPtr, XMP_Uns32 size ); + + BoxRef AddChildBox ( BoxRef parentRef, XMP_Uns32 childType, const void * dataPtr, XMP_Uns32 size ); + + // --------------------------------------------------------------------------------------------- + // DeleteNthChild - Delete the overall n-th child, return true if there was one. + // DeleteTypeChild - Delete the first child of the given type, return true if there was one. + + bool DeleteNthChild ( BoxRef parentRef, size_t childIndex ); + bool DeleteTypeChild ( BoxRef parentRef, XMP_Uns32 childType ); + + // --------------------------------------------------------------------------------------------- + + bool IsChanged() const { return this->moovNode.changed; }; + + // --------------------------------------------------------------------------------------------- + // The client is expected to fill in fullSubtree before calling ParseMemoryTree, and directly + // use fullSubtree after calling UpdateMemoryTree. + // + // IMPORTANT: We only support cases where the 'moov' subtree is significantly less than 4 GB, in + // particular with a threshold of probably 100 MB. This has 2 big impacts: we can safely use + // 32-bit offsets and sizes, and comfortably assume everything will fit in available heap space. + + RawDataBlock fullSubtree; // The entire 'moov' box, straight from the file or from UpdateMemoryTree. + + void ParseMemoryTree ( XMP_Uns8 fileMode ); + void UpdateMemoryTree(); + + // --------------------------------------------------------------------------------------------- + + #pragma pack (1) // ! These must match the file layout! + + struct Content_mvhd_0 { + XMP_Uns32 vFlags; // 0 + XMP_Uns32 creationTime; // 4 + XMP_Uns32 modificationTime; // 8 + XMP_Uns32 timescale; // 12 + XMP_Uns32 duration; // 16 + XMP_Int32 rate; // 20 + XMP_Int16 volume; // 24 + XMP_Uns16 pad_1; // 26 + XMP_Uns32 pad_2, pad_3; // 28 + XMP_Int32 matrix [9]; // 36 + XMP_Uns32 preDef [6]; // 72 + XMP_Uns32 nextTrackID; // 96 + }; // 100 + + struct Content_mvhd_1 { + XMP_Uns32 vFlags; // 0 + XMP_Uns64 creationTime; // 4 + XMP_Uns64 modificationTime; // 12 + XMP_Uns32 timescale; // 20 + XMP_Uns64 duration; // 24 + XMP_Int32 rate; // 32 + XMP_Int16 volume; // 36 + XMP_Uns16 pad_1; // 38 + XMP_Uns32 pad_2, pad_3; // 40 + XMP_Int32 matrix [9]; // 48 + XMP_Uns32 preDef [6]; // 84 + XMP_Uns32 nextTrackID; // 108 + }; // 112 + + struct Content_hdlr { // An 'hdlr' box as defined by ISO 14496-12. Maps OK to the QuickTime box. + XMP_Uns32 versionFlags; // 0 + XMP_Uns32 preDef; // 4 + XMP_Uns32 handlerType; // 8 + XMP_Uns32 reserved [3]; // 12 + // Plus optional component name string, null terminated UTF-8. + }; // 24 + + struct Content_stsd_entry { + XMP_Uns32 entrySize; // 0 + XMP_Uns32 format; // 4 + XMP_Uns8 reserved_1 [6]; // 8 + XMP_Uns16 dataRefIndex; // 14 + XMP_Uns32 reserved_2; // 16 + XMP_Uns32 flags; // 20 + XMP_Uns32 timeScale; // 24 + XMP_Uns32 frameDuration; // 28 + XMP_Uns8 frameCount; // 32 + XMP_Uns8 reserved_3; // 33 + // Plus optional trailing ISO boxes. + }; // 34 + + struct Content_stsc_entry { + XMP_Uns32 firstChunkNumber; // 0 + XMP_Uns32 samplesPerChunk; // 4 + XMP_Uns32 sampleDescrID; // 8 + }; // 12 + + // --------------------------------------------------------------------------------------------- + + MOOV_Manager() : fileMode(0) + { + XMP_Assert ( sizeof ( Content_mvhd_0 ) == 100 ); // Make sure the structs really are packed. + XMP_Assert ( sizeof ( Content_mvhd_1 ) == 112 ); + XMP_Assert ( sizeof ( Content_hdlr ) == 24 ); + XMP_Assert ( sizeof ( Content_stsd_entry ) == 34 ); + XMP_Assert ( sizeof ( Content_stsc_entry ) == 12 ); + }; + + virtual ~MOOV_Manager() {}; + +private: + + struct BoxNode; + typedef std::vector<BoxNode> BoxList; + typedef BoxList::iterator BoxListPos; + + struct BoxNode { + // ! Don't have a parent link, it will get destroyed by vector growth! + + XMP_Uns32 offset; // The offset in the fullSubtree, 0 if not in the parse. + XMP_Uns32 boxType; + XMP_Uns32 headerSize; // The actual header size in the fullSubtree, 0 if not in the parse. + XMP_Uns32 contentSize; // The current content size, does not include nested boxes. + BoxList children; + RawDataBlock changedContent; // Might be empty even if changed is true. + bool changed; // If true, the content is in changedContent, else in fullSubtree. + + BoxNode() : offset(0), boxType(0), headerSize(0), contentSize(0), changed(false) {}; + BoxNode ( XMP_Uns32 _offset, XMP_Uns32 _boxType, XMP_Uns32 _headerSize, XMP_Uns32 _contentSize ) + : offset(_offset), boxType(_boxType), headerSize(_headerSize), contentSize(_contentSize), changed(false) {}; + + }; + + XMP_Uns8 fileMode; + BoxNode moovNode; + + void ParseNestedBoxes ( BoxNode * parentNode, const std::string & parentPath, bool ignoreMetaBoxes ); + + XMP_Uns8 * PickContentPtr ( const BoxNode & node ) const; + void FillBoxInfo ( const BoxNode & node, BoxInfo * info ) const; + + XMP_Uns32 NewSubtreeSize ( const BoxNode & node, const std::string & parentPath ); + XMP_Uns8 * AppendNewSubtree ( const BoxNode & node, const std::string & parentPath, + XMP_Uns8 * newPtr, XMP_Uns8 * newEnd ); + +}; // MOOV_Manager + +#endif // __MOOV_Support_hpp__ |