A template class specially for coding the DC subband of Intra frames.

#include <band_codec.h>

Inheritance diagram for dirac::GenericIntraDCBandCodec< EntropyCodec >:

Collaboration diagram for dirac::GenericIntraDCBandCodec< EntropyCodec >:

Public Member Functions
	GenericIntraDCBandCodec (SubbandByteIO *subband_byteio, size_t number_of_contexts, const SubbandList &band_list)
	Constructor. More...

Public Member Functions inherited from dirac::GenericBandCodec< EntropyCodec >
	GenericBandCodec (SubbandByteIO *subband_byteio, size_t number_of_contexts, const SubbandList &band_list, int band_num, const bool is_intra)
	Constructor. More...

Protected Member Functions
void	ClearBlock (const CodeBlock &code_block, CoeffArray &coeff_data)
	When coding a skipped block, propegate the predicted values for future non skipped blocks. More...

CoeffType	GetPrediction (const CoeffArray &data, const int xpos, const int ypos) const
	Prediction of a DC value from its previously coded neighbours. More...

void	DecodeCoeffBlock (const CodeBlock &code_block, CoeffArray &out_data)
	Decode codeblock of coefficients and perform DC prediction. More...

Protected Member Functions inherited from dirac::GenericBandCodec< EntropyCodec >
void	CodeVal (CoeffArray &in_data, const int xpos, const int ypos, const CoeffType val)
	Code an individual quantised value and perform inverse-quantisation. More...

void	DecodeVal (CoeffArray &out_data, const int xpos, const int ypos)
	Decode an individual quantised value and perform inverse-quantisation. More...

void	CodeQuantIndexOffset (const int offset)
	Encode the offset for a code block quantiser. More...

int	DecodeQuantIndexOffset ()
	Decode the offset for a code block quantiser. More...

void	SetToVal (const CodeBlock &code_block, CoeffArray &coeff_data, const CoeffType val)
	Set a code block area to a given value. More...

virtual void	DoWorkCode (CoeffArray &in_data)

virtual void	DoWorkDecode (CoeffArray &out_data)

virtual void	CodeCoeffBlock (const CodeBlock &code_block, CoeffArray &in_data)

virtual void	CodeCoeff (CoeffArray &in_data, const int xpos, const int ypos)

virtual void	DecodeCoeff (CoeffArray &in_data, const int xpos, const int ypos)

int	ChooseFollowContext (const int bin_number) const
	A function for choosing the context for "follow bits". More...

int	ChooseInfoContext () const
	A function for choosing the context for "information bits". More...

int	ChooseSignContext (const CoeffArray &data, const int xpos, const int ypos) const
	A function for choosing the context for sign bits. More...

Additional Inherited Members
Protected Attributes inherited from dirac::GenericBandCodec< EntropyCodec >
bool	m_is_intra
	Flag indicating whether the band comes from an intra picture. More...

int	m_bnum
	variables More...

const Subband	m_node
	the subband being coded More...

int	m_last_qf_idx
	the quantisation index of the last codeblock More...

int	m_qf
	quantisation value More...

CoeffType	m_offset
	reconstruction point More...

bool	m_nhood_nonzero
	True if neighbours non-zero. More...

Subband	m_pnode
	the parent subband More...

int	m_pxpos
	position of the parent coefficient More...

int	m_pypos

bool	m_parent_notzero
	True if the parent of a coeff is not zero. More...

Constructor & Destructor Documentation

template<typename EntropyCodec>

dirac::GenericIntraDCBandCodec< EntropyCodec >::GenericIntraDCBandCodec	(	SubbandByteIO *	subband_byteio,
		size_t	number_of_contexts,
		const SubbandList &	band_list
	)

inline

Creates a IntraDCBandCodec object to encode subband data

Parameters

subband_byteio	input/output for the encoded bits
number_of_contexts	the number of contexts used in the encoding process
band_list	the set of all the subbands