CDecoder Class Reference

PGF decoder class. More...

#include <Decoder.h>

List of all members.

Public Member Functions
	CDecoder (CPGFStream *stream, PGFPreHeader &preHeader, PGFHeader &header, PGFPostHeader &postHeader, UINT32 *&levelLength) THROW_
	CDecoder (CPGFStream *stream=NULL)
	~CDecoder ()
void	DecodeInterleaved (CWaveletTransform *wtChannel, int level, int quantParam) THROW_
void	DequantizeValue (CSubband *band, UINT32 bandPos, int quantParam)
UINT32	GetEncodedHeaderLength () const
void	Partition (CSubband *band, int quantParam, int width, int height, int startPos, int pitch) THROW_
UINT32	ReadEncodedData (UINT8 *target, UINT32 len) const THROW_
void	SetStreamPosToData () THROW_
void	SetStreamPosToStart () THROW_
void	Skip (UINT64 offset) THROW_
Protected Attributes
bool	m_bufferIsAvailable
UINT32	m_codeBuffer [BufferSize]
UINT32	m_codePos
UINT32	m_encodedHeaderLength
UINT32	m_sigFlagVector [BufferLen]
UINT64	m_startPos
CPGFStream *	m_stream
DataT	m_value [BufferSize]
UINT32	m_valuePos

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Detailed Description

PGF decoder class.

Author:

C. Stamm, R. Spuler

Definition at line 40 of file Decoder.h.

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Constructor & Destructor Documentation

CDecoder::CDecoder

(

CPGFStream *

stream = NULL

)

Constructor: Initialize PGF stream and buffer position.

Parameters:

stream

A PGF stream or NULL

Definition at line 57 of file Decoder.cpp.

CDecoder::CDecoder	(	CPGFStream *	stream,
		PGFPreHeader &	preHeader,
		PGFHeader &	header,
		PGFPostHeader &	postHeader,
		UINT32 *&	levelLength
	)

Constructor: Read pre-header, header, and levelLength at current stream position.

It might throw an IOException.

Parameters:

	stream	A PGF stream
	preHeader	[out] A PGF pre-header
	header	[out] A PGF header
	postHeader	[out] A PGF post-header
	levelLength	The location of the levelLength array. The array is allocated in this method. The caller has to delete this array.

Definition at line 69 of file Decoder.cpp.

CDecoder::~CDecoder

(

)

Destructor.

Definition at line 166 of file Decoder.cpp.

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Member Function Documentation

void CDecoder::DecodeInterleaved	(	CWaveletTransform *	wtChannel,
		int	level,
		int	quantParam
	)

Deccoding and dequantization of HL and LH subband (interleaved) using partitioning scheme.

Partitioning scheme: The plane is partitioned in squares of side length InterBlockSize. It might throw an IOException.

Parameters:

	wtChannel	A wavelet transform channel containing the HL and HL band
	level	Wavelet transform level
	quantParam	Dequantization value

Definition at line 263 of file Decoder.cpp.

void CDecoder::DequantizeValue	(	CSubband *	band,
		UINT32	bandPos,
		int	quantParam
	)

Dequantization of a single value at given position in subband.

Parameters:

	band	A subband
	bandPos	A valid position in subband band
	quantParam	The quantization parameter

If encoded data is available, then stores dequantized band value into buffer m_value at position m_valuePos. Otherwise reads encoded data buffer and decodes it.

Parameters:

	band	A subband
	bandPos	A valid position in subband band
	quantParam	The quantization parameter

Definition at line 392 of file Decoder.cpp.

UINT32 CDecoder::GetEncodedHeaderLength

(

)

const [inline]

Return the length of all encoded headers in bytes.

Returns:

The length of all encoded headers in bytes

Definition at line 86 of file Decoder.h.

void CDecoder::Partition	(	CSubband *	band,
		int	quantParam,
		int	width,
		int	height,
		int	startPos,
		int	pitch
	)

Unpartitions a rectangular region of a given subband.

Partitioning scheme: The plane is partitioned in squares of side length LinBlockSize. Write wavelet coefficients into buffer. It might throw an IOException.

Parameters:

	band	A subband
	quantParam	Dequantization value
	width	The width of the rectangle
	height	The height of the rectangle
	startPos	The buffer position of the top left corner of the rectangular region
	pitch	The number of bytes in row of the subband

Definition at line 195 of file Decoder.cpp.

UINT32 CDecoder::ReadEncodedData	(	UINT8 *	target,
		UINT32	len
	)			const

Copies data from the open stream to a target buffer.

It might throw an IOException.

Parameters:

	target	The target buffer
	len	The number of bytes to read

Returns:

The number of bytes copied to the target buffer

Definition at line 175 of file Decoder.cpp.

void CDecoder::SetStreamPosToData

(

)

[inline]

Reset stream position to beginning of PGF pre header.

Definition at line 94 of file Decoder.h.

void CDecoder::SetStreamPosToStart

(

)

[inline]

Reset stream position to beginning of PGF pre header.

Definition at line 90 of file Decoder.h.

void CDecoder::Skip

(

UINT64

offset

)

Skip a given number of bytes in the open stream.

It might throw an IOException.

Definition at line 380 of file Decoder.cpp.

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Member Data Documentation

bool CDecoder::m_bufferIsAvailable [protected]

Definition at line 160 of file Decoder.h.

UINT32 CDecoder::m_codeBuffer[BufferSize] [protected]

Definition at line 153 of file Decoder.h.

UINT32 CDecoder::m_codePos [protected]

Definition at line 158 of file Decoder.h.

UINT32 CDecoder::m_encodedHeaderLength [protected]

Definition at line 150 of file Decoder.h.

UINT32 CDecoder::m_sigFlagVector[BufferLen] [protected]

Definition at line 155 of file Decoder.h.

UINT64 CDecoder::m_startPos [protected]

Definition at line 149 of file Decoder.h.

CPGFStream* CDecoder::m_stream [protected]

Definition at line 148 of file Decoder.h.

DataT CDecoder::m_value[BufferSize] [protected]

Definition at line 152 of file Decoder.h.

UINT32 CDecoder::m_valuePos [protected]

Definition at line 157 of file Decoder.h.

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The documentation for this class was generated from the following files:

• Decoder.h
• Decoder.cpp