Dirac - A Video Codec

Created by the British Broadcasting Corporation.


dirac::MotionCompensator Class Reference

Abstract Motion compensator class. More...

#include <mot_comp.h>

Inheritance diagram for dirac::MotionCompensator:

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List of all members.

Public Member Functions

Static Public Member Functions

Protected Attributes

Private Member Functions


Detailed Description

Motion compensator class, for doing motion compensation with two references and overlapped blocks, using raised-cosine roll-off. This is an abstract class. It must be sub-classed and the CompensateBlock must be defined in the sub-classes.


Constructor & Destructor Documentation

dirac::MotionCompensator::MotionCompensator const CodecParams cp  ) 
 

Constructor initialises using codec parameters.

virtual dirac::MotionCompensator::~MotionCompensator  )  [virtual]
 

dirac::MotionCompensator::MotionCompensator const MotionCompensator cpy  )  [private]
 


Member Function Documentation

virtual void dirac::MotionCompensator::CompensateBlock TwoDArray< CalcValueType > &  pic_data,
const PicArray refup_data,
const MVector Vec,
const ImageCoords Pos,
const TwoDArray< CalcValueType > &  Weights
[private, pure virtual]
 

Implemented in dirac::MotionCompensator_Pixel, dirac::MotionCompensator_HalfPixel, dirac::MotionCompensator_QuarterPixel, and dirac::MotionCompensator_EighthPixel.

void dirac::MotionCompensator::CompensateComponent Frame picframe,
const Frame ref1frame,
const Frame ref2frame,
const MvData mv_data,
const CompSort  cs
[private]
 

void dirac::MotionCompensator::CompensateFrame const AddOrSub  direction,
FrameBuffer my_buffer,
int  fnum,
const MvData mv_data
 

Perform motion compensated addition/subtraction on a frame using parameters

Parameters:
direction whether we're subtracting or adding
fnum number of frame in the frame buffer to be compensated
my_buffer the FrameBuffer object containing the frame and the reference frames `
mv_data the motion vector data

static void dirac::MotionCompensator::CompensateFrame const CodecParams cp,
const AddOrSub  direction,
FrameBuffer buffer,
const int  fnum,
const MvData mv_data
[static]
 

Static function that motion compensates a frame. It uses the MV precision value in the CodecParams to instantiate the appropriate MotionCompensation sub-class.

Parameters:
cp Encoder/decoder parameters
direction whether we're subtracting or adding
buffer the FrameBuffer object containing the frame and the reference frames
fnum number of frame in the frame buffer to be compensated `
mv_data the motion vector data

void dirac::MotionCompensator::CreateBlock const OLBParams bparams,
bool  FullX,
bool  FullY,
TwoDArray< CalcValueType > &  WeightArray
[private]
 

Params defines the block parameters so the relevant weighting arrays can be created. FullX and FullY refer to whether the weight should be adjusted for the edge of an image. eg. 1D Weighting shapes in x direction FullX true FullX false ******** * * * * * *

void dirac::MotionCompensator::DCBlock TwoDArray< CalcValueType > &  pic_data,
const ValueType  dc,
const ImageCoords Pos,
const TwoDArray< CalcValueType > &  Weights
[private]
 

Recalculate the weight matrix and store other key block related parameters. DC-compensate an individual block

void dirac::MotionCompensator::FlipX const TwoDArray< CalcValueType > &  Original,
const OLBParams bparams,
TwoDArray< CalcValueType > &  Flipped
[private]
 

void dirac::MotionCompensator::FlipY const TwoDArray< CalcValueType > &  Original,
const OLBParams bparams,
TwoDArray< CalcValueType > &  Flipped
[private]
 

MotionCompensator& dirac::MotionCompensator::operator= const MotionCompensator rhs  )  [private]
 

float dirac::MotionCompensator::RaisedCosine float  t,
float  B
[private]
 

void dirac::MotionCompensator::ReConfig  )  [private]
 


Member Data Documentation

bool dirac::MotionCompensator::luma_or_chroma [protected]
 

AddOrSub dirac::MotionCompensator::m_add_or_sub [protected]
 

TwoDArray<CalcValueType>* dirac::MotionCompensator::m_block_weights [protected]
 

OLBParams dirac::MotionCompensator::m_bparams [protected]
 

ChromaFormat dirac::MotionCompensator::m_cformat [protected]
 

CodecParams dirac::MotionCompensator::m_cparams [protected]
 

TwoDArray<CalcValueType>* dirac::MotionCompensator::m_half_block_weights [protected]
 


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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