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livetrax/libs/appleutility/CoreAudio/AudioFile/AFPublic/CompressedPacketTable.h

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/*
File: CompressedPacketTable.h
Abstract: Part of CoreAudio Utility Classes
Version: 1.1
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*/
#include <iterator>
#include <vector>
#if !defined(__COREAUDIO_USE_FLAT_INCLUDES__)
#include <CoreAudio/CoreAudioTypes.h>
#else
#include "CoreAudioTypes.h"
#endif
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
struct AudioStreamPacketDescriptionExtended : AudioStreamPacketDescription
{
SInt64 mFrameOffset; // this is the sum of the mVariableFramesInPacket up to this point so we can binary search.
};
typedef struct AudioStreamPacketDescriptionExtended AudioStreamPacketDescriptionExtended;
inline bool operator < (const AudioStreamPacketDescriptionExtended& a, const AudioStreamPacketDescriptionExtended& b)
{
return a.mFrameOffset < b.mFrameOffset;
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
class CompressedPacketTable
{
public:
CompressedPacketTable(UInt32 inFramesPerPacket) : mSize(0), mFramesPerPacket(inFramesPerPacket) {}
~CompressedPacketTable();
SInt64 size() const { return mSize; }
void push_back(const AudioStreamPacketDescriptionExtended& inDesc);
const AudioStreamPacketDescriptionExtended operator[](SInt64 inPacketIndex) const;
const AudioStreamPacketDescriptionExtended front() const { return (*this)[0]; }
const AudioStreamPacketDescriptionExtended back() const { return (*this)[mSize-1]; }
//SInt64 PacketForByte(SInt64 inByteOffset) const;
SInt64 ByteForPacket(SInt64 inPacketIndex) const { return (*this)[inPacketIndex].mStartOffset; }
class iterator {
public:
typedef std::input_iterator_tag iterator_category;
typedef iterator pointer;
typedef SInt64 difference_type;
typedef AudioStreamPacketDescriptionExtended value_type;
typedef value_type& reference;
iterator() : mTable(NULL), mIndex(0) {}
iterator(const CompressedPacketTable* table, SInt64 index) : mTable(table), mIndex(index) {}
iterator(const iterator& that) : mTable(that.mTable), mIndex(that.mIndex) {}
iterator& operator=(const iterator& that) { mTable = that.mTable; mIndex = that.mIndex; return *this; }
const AudioStreamPacketDescriptionExtended operator*() const { return (*mTable)[mIndex]; }
const AudioStreamPacketDescriptionExtended* const operator->() { mValue = (*mTable)[mIndex]; return &mValue; }
iterator& operator++() { ++mIndex; return *this; }
iterator& operator--() { --mIndex; return *this; }
SInt64 operator-(const iterator& that) { return mIndex - that.mIndex; }
const iterator operator-(SInt64 index) { return iterator(mTable, mIndex - index); }
const iterator operator+(SInt64 index) { return iterator(mTable, mIndex + index); }
bool operator==(const iterator& that) { return mIndex == that.mIndex; }
bool operator!=(const iterator& that) { return mIndex != that.mIndex; }
bool operator>(const iterator& that) { return mIndex > that.mIndex; }
bool operator<(const iterator& that) { return mIndex < that.mIndex; }
private:
const CompressedPacketTable* mTable;
SInt64 mIndex;
AudioStreamPacketDescriptionExtended mValue; // in order to support operator-> .
};
iterator begin() const { return iterator(this, 0); }
iterator end() const { return iterator(this, mSize); }
private:
struct TinyContiguousPacketDescription
{
UInt16 mNextOffset;
};
struct TinyDiscontiguousPacketDescription : TinyContiguousPacketDescription
{
UInt16 mDataByteSize;
};
// There could be a 24 bit packet description. But ALAC is who usually needs SmallContiguousPacketDescription and
// it already uses 8x fewer packet descriptions than AAC due to the mFramesPerPacket being 8x greater.
// So there isn't as great a need for saving space. 4 bytes per packet is OK for ALAC.
struct SmallContiguousPacketDescription
{
UInt32 mNextOffset;
};
struct SmallDiscontiguousPacketDescription : SmallContiguousPacketDescription
{
UInt16 mDataByteSize;
};
struct BigContiguousPacketDescription
{
UInt64 mNextOffset;
};
struct BigDiscontiguousPacketDescription : BigContiguousPacketDescription
{
UInt32 mDataByteSize;
};
struct PacketBase
{
SInt64 mBaseOffset;
UInt8 mDescType;
void* mDescs;
};
enum {
kTinyContiguousPacketDescription,
kTinyDiscontiguousPacketDescription,
kSmallContiguousPacketDescription,
kSmallDiscontiguousPacketDescription,
kBigContiguousPacketDescription,
kBigDiscontiguousPacketDescription,
kExtendedPacketDescription
};
static const UInt32 kShift;
static const UInt32 kMask;
bool isContiguous(PacketBase& base);
bool hasVariableFrames(PacketBase& base);
UInt32 largestPacket(PacketBase& base);
void Compress(PacketBase& base);
private:
std::vector<PacketBase> mBases;
UInt64 mSize;
UInt32 mFramesPerPacket;
};