Dirac - A Video Codec

Created by the British Broadcasting Corporation.


dirac::VectorElementCodec Class Reference

Codes and decodes an array of motion vectors. More...

#include <mv_codec.h>

Inheritance diagram for dirac::VectorElementCodec:
Collaboration diagram for dirac::VectorElementCodec:

Public Member Functions

 VectorElementCodec (ByteIO *p_byteio, int ref_id, MvElement horvert, size_t number_of_contexts)
 Constructor.
void InitContexts ()
 Initialises the contexts.
Public Member Functions inherited from dirac::ArithCodec< MvData >
 ArithCodec (ByteIO *p_byteio, size_t number_of_contexts)
 Constructor for encoding.
virtual ~ArithCodec ()
 Destructor.
int Compress (MvData &in_data)
 Compresses the input and returns the number of bits written.
void Decompress (MvData &out_data, const int num_bytes)
 Decompresses the bitstream and writes into the output.
Public Member Functions inherited from dirac::ArithCodecBase
 ArithCodecBase (ByteIO *p_byteio, size_t number_of_contexts)
 Constructor.
virtual ~ArithCodecBase ()
 Destructor.

Private Member Functions

 VectorElementCodec (const VectorElementCodec &cpy)
 Private, bodyless copy constructor: class should not be copied.
VectorElementCodecoperator= (const VectorElementCodec &rhs)
 Private, bodyless copy operator=: class should not be assigned.
void CodeVal (const MvData &in_data)
void DecodeVal (MvData &out_data)
void DoWorkCode (MvData &in_data)
 Does the work of actually coding the data.
void DoWorkDecode (MvData &out_data)
 virtual decode-only functions
void ResetAll ()
int Prediction (const MvArray &mvarray, const TwoDArray< PredMode > &preddata) const

Private Attributes

int m_b_xp
int m_b_yp
int m_sb_xp
int m_sb_yp
int m_sb_tlb_x
int m_sb_tlb_y
const int m_ref
const MvElement m_hv

Additional Inherited Members

Protected Member Functions inherited from dirac::ArithCodecBase
void InitEncoder ()
 Initialises the Encoder.
void EncodeSymbol (const bool symbol, const int context_num)
 encodes a symbol and writes to output
void EncodeUInt (const unsigned int value, const int bin1, const int max_bin)
void EncodeSInt (const int value, const int bin1, const int max_bin)
void FlushEncoder ()
 flushes the output of the encoder.
int ByteCount () const
void InitDecoder (int num_bytes)
 Initialise the Decoder.
bool DecodeSymbol (int context_num)
 Decodes a symbol given a context number.
unsigned int DecodeUInt (const int bin1, const int max_bin)
int DecodeSInt (const int bin1, const int max_bin)
Protected Attributes inherited from dirac::ArithCodecBase
std::vector< Contextm_context_list
 List of contexts.

Detailed Description

Derived from the ArithCodec class, this codes and decodes a motion vector element (vertical or horizontal)

Constructor & Destructor Documentation

◆ VectorElementCodec() [1/2]

dirac::VectorElementCodec::VectorElementCodec ( ByteIO * p_byteio,
int ref_id,
MvElement horvert,
size_t number_of_contexts )

Creates a MvDataCodec object to encode MV data, based on parameters

Parameters
p_byteioInput/output for the encoded bits
ref_idThe identity of the reference (1 or 2)
horvertThe identity of the vector element (horizontal or vertical)
number_of_contextsthe number of contexts used

Referenced by operator=(), and VectorElementCodec().

◆ VectorElementCodec() [2/2]

dirac::VectorElementCodec::VectorElementCodec ( const VectorElementCodec & cpy)
private

References VectorElementCodec().

Member Function Documentation

◆ CodeVal()

void dirac::VectorElementCodec::CodeVal ( const MvData & in_data)
private

◆ DecodeVal()

void dirac::VectorElementCodec::DecodeVal ( MvData & out_data)
private

◆ DoWorkCode()

void dirac::VectorElementCodec::DoWorkCode ( MvData & in_data)
privatevirtual

◆ DoWorkDecode()

void dirac::VectorElementCodec::DoWorkDecode ( MvData & out_data)
privatevirtual

◆ InitContexts()

void dirac::VectorElementCodec::InitContexts ( )

◆ operator=()

VectorElementCodec & dirac::VectorElementCodec::operator= ( const VectorElementCodec & rhs)
private

References VectorElementCodec().

◆ Prediction()

int dirac::VectorElementCodec::Prediction ( const MvArray & mvarray,
const TwoDArray< PredMode > & preddata ) const
private

◆ ResetAll()

void dirac::VectorElementCodec::ResetAll ( )
private

Member Data Documentation

◆ m_b_xp

int dirac::VectorElementCodec::m_b_xp
private

◆ m_b_yp

int dirac::VectorElementCodec::m_b_yp
private

◆ m_hv

const MvElement dirac::VectorElementCodec::m_hv
private

◆ m_ref

const int dirac::VectorElementCodec::m_ref
private

◆ m_sb_tlb_x

int dirac::VectorElementCodec::m_sb_tlb_x
private

◆ m_sb_tlb_y

int dirac::VectorElementCodec::m_sb_tlb_y
private

◆ m_sb_xp

int dirac::VectorElementCodec::m_sb_xp
private

◆ m_sb_yp

int dirac::VectorElementCodec::m_sb_yp
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.
HTML documentation generated by Dimitri van Heesch's excellent Doxygen tool.