Dirac - A Video Codec

Created by the British Broadcasting Corporation.


Public Member Functions | Private Member Functions
dirac::IntraDCBandVLC Class Reference

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

#include <band_vlc.h>

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List of all members.

Public Member Functions

 IntraDCBandVLC (SubbandByteIO *subband_byteio, const SubbandList &band_list)
 Constructor.
- Public Member Functions inherited from dirac::GenericIntraDCBandCodec< ArithCodecToVLCAdapter >
 GenericIntraDCBandCodec (SubbandByteIO *subband_byteio, size_t number_of_contexts, const SubbandList &band_list)
 Constructor.
- Public Member Functions inherited from dirac::GenericBandCodec< ArithCodecToVLCAdapter >
 GenericBandCodec (SubbandByteIO *subband_byteio, size_t number_of_contexts, const SubbandList &band_list, int band_num, const bool is_intra)
 Constructor.
- Public Member Functions inherited from dirac::ArithCodecToVLCAdapter
 ArithCodecToVLCAdapter (SubbandByteIO *subband_byteio, size_t number_of_contexts)
virtual ~ArithCodecToVLCAdapter ()
int Compress (CoeffArray &in_data)
void Decompress (CoeffArray &out_data, int num_bytes)
void EncodeSymbol (bool val, int)
bool DecodeSymbol (int)

Private Member Functions

void CodeCoeff (CoeffArray &in_data, const int xpos, const int ypos)
 Encode a single coefficient using error-feedback DC quantization.
 IntraDCBandVLC (const IntraDCBandVLC &cpy)
 Private, bodyless copy constructor: class should not be copied.
IntraDCBandVLCoperator= (const IntraDCBandVLC &rhs)
 Private, bodyless copy operator=: class should not be assigned.

Additional Inherited Members

- Protected Member Functions inherited from dirac::GenericIntraDCBandCodec< ArithCodecToVLCAdapter >
void ClearBlock (const CodeBlock &code_block, CoeffArray &coeff_data)
 When coding a skipped block, propegate the predicted values for future non skipped blocks.
CoeffType GetPrediction (const CoeffArray &data, const int xpos, const int ypos) const
 Prediction of a DC value from its previously coded neighbours.
void DecodeCoeffBlock (const CodeBlock &code_block, CoeffArray &out_data)
 Decode codeblock of coefficients and perform DC prediction.
- Protected Member Functions inherited from dirac::GenericBandCodec< ArithCodecToVLCAdapter >
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 DoWorkCode (CoeffArray &in_data)
virtual void DoWorkDecode (CoeffArray &out_data)
virtual void CodeCoeffBlock (const CodeBlock &code_block, CoeffArray &in_data)
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.

Detailed Description

A class specially for coding the DC subband of Intra frames, using intra-band prediction of coefficients.


Constructor & Destructor Documentation

dirac::IntraDCBandVLC::IntraDCBandVLC ( SubbandByteIO subband_byteio,
const SubbandList band_list 
)

Creates a IntraDCBandVLC object to encode subband data, based on parameters

Parameters:
subband_byteioinput/output for the encoded bits
band_listthe set of all the subbands
dirac::IntraDCBandVLC::IntraDCBandVLC ( const IntraDCBandVLC cpy)
private

Member Function Documentation

void dirac::IntraDCBandVLC::CodeCoeff ( CoeffArray in_data,
const int  xpos,
const int  ypos 
)
privatevirtual
IntraDCBandVLC& dirac::IntraDCBandVLC::operator= ( const IntraDCBandVLC rhs)
private

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

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