Dirac - A Video Codec

Created by the British Broadcasting Corporation.


dirac::GenericBandCodec< EntropyCodec > Class Template Reference

A template class for coding and decoding wavelet subband data.

#include <band_codec.h>

Inheritance diagram for dirac::GenericBandCodec< EntropyCodec >:
dirac::GenericIntraDCBandCodec< EntropyCodec >

Public Member Functions

 GenericBandCodec (SubbandByteIO *subband_byteio, size_t number_of_contexts, const SubbandList &band_list, int band_num, const bool is_intra)
 Constructor.
 

Protected Member Functions

void CodeVal (CoeffArray &in_data, const int xpos, const int ypos, const CoeffType val)
 Code an individual quantised value and perform inverse-quantisation.
 
void DecodeVal (CoeffArray &out_data, const int xpos, const int ypos)
 Decode an individual quantised value and perform inverse-quantisation.
 
void CodeQuantIndexOffset (const int offset)
 Encode the offset for a code block quantiser.
 
int DecodeQuantIndexOffset ()
 Decode the offset for a code block quantiser.
 
void SetToVal (const CodeBlock &code_block, CoeffArray &coeff_data, const CoeffType val)
 Set a code block area to a given value.
 
virtual void ClearBlock (const CodeBlock &code_block, CoeffArray &coeff_data)
 Set all block values to 0.
 
virtual void DoWorkCode (CoeffArray &in_data)
 
virtual void DoWorkDecode (CoeffArray &out_data)
 
virtual void CodeCoeffBlock (const CodeBlock &code_block, CoeffArray &in_data)
 
virtual void DecodeCoeffBlock (const CodeBlock &code_block, CoeffArray &out_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".
 
int ChooseInfoContext () const
 A function for choosing the context for "information bits".
 
int ChooseSignContext (const CoeffArray &data, const int xpos, const int ypos) const
 A function for choosing the context for sign bits.
 

Protected Attributes

bool m_is_intra
 Flag indicating whether the band comes from an intra picture.
 
int m_bnum
 variables
 
const Subband m_node
 the subband being coded
 
int m_last_qf_idx
 the quantisation index of the last codeblock
 
int m_qf
 quantisation value
 
CoeffType m_offset
 reconstruction point
 
bool m_nhood_nonzero
 True if neighbours non-zero.
 
Subband m_pnode
 the parent subband
 
int m_pxpos
 position of the parent coefficient
 
int m_pypos
 
bool m_parent_notzero
 True if the parent of a coeff is not zero.
 

Private Member Functions

 GenericBandCodec (const GenericBandCodec &cpy)
 Private, bodyless copy constructor: class should not be copied.
 
GenericBandCodecoperator= (const GenericBandCodec &rhs)
 Private, bodyless copy operator=: class should not be assigned.
 

Constructor & Destructor Documentation

◆ GenericBandCodec() [1/2]

template<typename EntropyCodec>
GenericBandCodec::GenericBandCodec ( SubbandByteIO * subband_byteio,
size_t number_of_contexts,
const SubbandList & band_list,
int band_num,
const bool is_intra )

Constructor for encoding.

Creates a BandCodec object to encode subband data

Parameters
subband_byteioinput/output for the encoded bits
number_of_contextsthe number of contexts used in the encoding process
band_listthe set of all the subbands
band_numthe number of the subband being coded
is_intraFlag indicating whether the band comes from an intra picture

References m_bnum, m_is_intra, m_last_qf_idx, m_node, and m_pnode.

Referenced by dirac::GenericIntraDCBandCodec< EntropyCodec >::GenericIntraDCBandCodec().

◆ GenericBandCodec() [2/2]

template<typename EntropyCodec>
dirac::GenericBandCodec< EntropyCodec >::GenericBandCodec ( const GenericBandCodec< EntropyCodec > & cpy)
private

Member Function Documentation

◆ ChooseFollowContext()

◆ ChooseInfoContext()

template<typename EntropyCodec>
int GenericBandCodec::ChooseInfoContext ( ) const
inlineprotected

References dirac::INFO_CTX.

Referenced by CodeVal(), and DecodeVal().

◆ ChooseSignContext()

template<typename EntropyCodec>
int GenericBandCodec::ChooseSignContext ( const CoeffArray & data,
const int xpos,
const int ypos ) const
inlineprotected

◆ ClearBlock()

◆ CodeCoeff()

template<typename EntropyCodec>
void GenericBandCodec::CodeCoeff ( CoeffArray & in_data,
const int xpos,
const int ypos )
protectedvirtual

◆ CodeCoeffBlock()

template<typename EntropyCodec>
void GenericBandCodec::CodeCoeffBlock ( const CodeBlock & code_block,
CoeffArray & in_data )
protectedvirtual

◆ CodeQuantIndexOffset()

template<typename EntropyCodec>
void GenericBandCodec::CodeQuantIndexOffset ( const int offset)
protected

Referenced by CodeCoeffBlock().

◆ CodeVal()

template<typename EntropyCodec>
void GenericBandCodec::CodeVal ( CoeffArray & in_data,
const int xpos,
const int ypos,
const CoeffType val )
inlineprotected

◆ DecodeCoeff()

template<typename EntropyCodec>
void GenericBandCodec::DecodeCoeff ( CoeffArray & in_data,
const int xpos,
const int ypos )
protectedvirtual

Reimplemented in dirac::IntraDCBandCodec.

References DecodeVal().

Referenced by DecodeCoeffBlock().

◆ DecodeCoeffBlock()

◆ DecodeQuantIndexOffset()

template<typename EntropyCodec>
int GenericBandCodec::DecodeQuantIndexOffset ( )
protected

◆ DecodeVal()

template<typename EntropyCodec>
void GenericBandCodec::DecodeVal ( CoeffArray & out_data,
const int xpos,
const int ypos )
inlineprotected

◆ DoWorkCode()

◆ DoWorkDecode()

◆ operator=()

template<typename EntropyCodec>
GenericBandCodec & dirac::GenericBandCodec< EntropyCodec >::operator= ( const GenericBandCodec< EntropyCodec > & rhs)
private

◆ SetToVal()

template<typename EntropyCodec>
void GenericBandCodec::SetToVal ( const CodeBlock & code_block,
CoeffArray & coeff_data,
const CoeffType val )
inlineprotected

Member Data Documentation

◆ m_bnum

template<typename EntropyCodec>
int dirac::GenericBandCodec< EntropyCodec >::m_bnum
protected

Referenced by GenericBandCodec().

◆ m_is_intra

template<typename EntropyCodec>
bool dirac::GenericBandCodec< EntropyCodec >::m_is_intra
protected

◆ m_last_qf_idx

template<typename EntropyCodec>
int dirac::GenericBandCodec< EntropyCodec >::m_last_qf_idx
protected

◆ m_nhood_nonzero

template<typename EntropyCodec>
bool dirac::GenericBandCodec< EntropyCodec >::m_nhood_nonzero
protected

◆ m_node

template<typename EntropyCodec>
const Subband dirac::GenericBandCodec< EntropyCodec >::m_node
protected

◆ m_offset

template<typename EntropyCodec>
CoeffType dirac::GenericBandCodec< EntropyCodec >::m_offset
protected

◆ m_parent_notzero

template<typename EntropyCodec>
bool dirac::GenericBandCodec< EntropyCodec >::m_parent_notzero
protected

◆ m_pnode

template<typename EntropyCodec>
Subband dirac::GenericBandCodec< EntropyCodec >::m_pnode
protected

◆ m_pxpos

template<typename EntropyCodec>
int dirac::GenericBandCodec< EntropyCodec >::m_pxpos
protected

Referenced by DecodeCoeffBlock().

◆ m_pypos

template<typename EntropyCodec>
int dirac::GenericBandCodec< EntropyCodec >::m_pypos
protected

Referenced by DecodeCoeffBlock().

◆ m_qf

template<typename EntropyCodec>
int dirac::GenericBandCodec< EntropyCodec >::m_qf
protected

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

© 2004 British Broadcasting Corporation. Dirac code licensed under the Mozilla Public License (MPL) Version 1.1.
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