Dirac - A Video Codec

Created by the British Broadcasting Corporation.


Public Member Functions | Private Member Functions | Private Attributes | Static Private Attributes
dirac::DownConverter Class Reference

A class for fast downconversion of picture data. More...

#include <downconvert.h>

List of all members.

Public Member Functions

 DownConverter ()
 Constructor.
 ~DownConverter ()
 Destructor.
void DoDownConvert (const PicArray &old_data, PicArray &new_data)
 A function to do the actual down-conversion.

Private Member Functions

 DownConverter (const DownConverter &cpy)
DownConverteroperator= (const DownConverter &rhs)
void RowLoop (const int colpos, PicArray &new_data)

Private Attributes

ValueTypem_row_buffer

Static Private Attributes

static const int Stage_I_Size = 6
static const int StageI_I = 86
static const int StageI_II = 46
static const int StageI_III = 4
static const int StageI_IV = -8
static const int StageI_V = -4
static const int StageI_VI = 4
static const int StageI_Shift = 8

Detailed Description

A class for fast down-conversion of picture data. The picture data is downconverted by a factor of two in each dimension, using fast filtering techniques. The filter is a half-band filter designed to trade off frequency response, ringiness, and aliasing


Constructor & Destructor Documentation

dirac::DownConverter::DownConverter ( )
dirac::DownConverter::~DownConverter ( )
inline
dirac::DownConverter::DownConverter ( const DownConverter cpy)
private

Member Function Documentation

void dirac::DownConverter::DoDownConvert ( const PicArray old_data,
PicArray new_data 
)

A function to do the actual downconversion.

Parameters:
old_datathe picture data to be downconverted
new_datathe resulting down-converted data. The array must be of the correct size.
DownConverter& dirac::DownConverter::operator= ( const DownConverter rhs)
private
void dirac::DownConverter::RowLoop ( const int  colpos,
PicArray new_data 
)
private

Member Data Documentation

ValueType* dirac::DownConverter::m_row_buffer
private
const int dirac::DownConverter::Stage_I_Size = 6
staticprivate
const int dirac::DownConverter::StageI_I = 86
staticprivate
const int dirac::DownConverter::StageI_II = 46
staticprivate
const int dirac::DownConverter::StageI_III = 4
staticprivate
const int dirac::DownConverter::StageI_IV = -8
staticprivate
const int dirac::DownConverter::StageI_Shift = 8
staticprivate
const int dirac::DownConverter::StageI_V = -4
staticprivate
const int dirac::DownConverter::StageI_VI = 4
staticprivate

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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