Dirac - A Video Codec

Created by the British Broadcasting Corporation.

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dirac::PictureCompressor Class Reference

Compress a single image picture. More...

#include <picture_compress.h>

Collaboration diagram for dirac::PictureCompressor:

[legend]List of all members.

Public Member Functions

• PictureCompressor (EncoderParams &encp)

  Constructor.
  

• ~PictureCompressor ()

  Destructor.
  

• void PixelME (EncQueue &my_buffer, int pnum)

  Do pixel accurate motion estimate.
  

• void CalcComplexity (EncQueue &my_buffer, int pnum, const OLBParams &olbparams)

  Calculate the complexity of a picture.
  

• void CalcComplexity2 (EncQueue &my_buffer, int pnum)
• void NormaliseComplexity (EncQueue &my_buffer, int pnum)

  Normalise picture complexity with respect to others in the queue.
  

• void SubPixelME (EncQueue &my_buffer, int pnum)

  Do subpixel accurate motion vector refinement.
  

• void ModeDecisionME (EncQueue &my_buffer, int pnum)

  Do mode decision based on sub-pel vectors.
  

• void IntraModeAnalyse (EncQueue &my_buffer, int pnum)

  Detect cuts in the current picture.
  

• void MotionCompensate (EncQueue &my_buffer, int pnum, AddOrSub dirn)

  Does motion compensation on picture pnum (forward or backward).
  

• void Prefilter (EncQueue &my_buffer, int pnum)

  Prefilter if required.
  

• void DoDWT (EncQueue &my_buffer, int pnum, Direction dirn)

  Do the DWT on a given picture.
  

• void CodeResidue (EncQueue &my_pbuffer, int pnum, PictureByteIO *pic_byteio)

  Compress a specific picture within a group of pictures (GOP).
  

• void CodeMVData (EncQueue &my_buffer, int pnum, PictureByteIO *pic_byteio)

  Compresses the motion vector data.
  

• bool IsSkipped ()

  Returns true if the picture has been skipped rather than coded normally.
  

• bool IsMEDataAvail () const

  Returns true if Motion estimation data is available.
  

• const MEData * GetMEData () const

  Returns the motion estimation data.
  

Private Member Functions

• PictureCompressor (const PictureCompressor &cpy)

  Copy constructor is private and body-less.
  

• PictureCompressor & operator= (const PictureCompressor &rhs)

  Assignment = is private and body-less.
  

• void InitCoeffData (CoeffArray &coeff_data, const int xl, const int yl)

  Initialise the coefficient data array for holding wavelet coefficients.
  

• float GetCompLambda (const EncPicture &my_picture, const CompSort csort)

  Returns the value lambda according to picture and component type.
  

• void SelectQuantisers (CoeffArray &coeff_data, SubbandList &bands, const float lambda, OneDArray< unsigned int > &est_counts, const CodeBlockMode cb_mode, const PictureParams &pp, const CompSort csort)
• int SelectMultiQuants (CoeffArray &coeff_data, SubbandList &bands, const int band_num, const float lambda, const PictureParams &pp, const CompSort csort)
• void SetupCodeBlocks (SubbandList &bands)
• void AddSubAverage (CoeffArray &coeff_data, int xl, int yl, AddOrSub dirn)

Private Attributes

• EncoderParams & m_encparams
• bool m_skipped
• bool m_use_global
• bool m_use_block_mv
• PredMode m_global_pred_mode
• MEData * m_me_data
• bool m_medata_avail
• bool m_is_a_cut
• MVPrecisionType m_orig_prec

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Detailed Description

This class compresses a single picture at a time, using parameters supplied at its construction. PictureCompressor is used by SequenceCompressor.

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Constructor & Destructor Documentation

dirac::PictureCompressor::PictureCompressor (  EncoderParams &  encp  )

Creates a FrameEncoder with specific set of parameters the control the compression process. It encodes motion data before encoding each component of the picture. Parameters: encp  encoder parameters

dirac::PictureCompressor::~PictureCompressor (   )

dirac::PictureCompressor::PictureCompressor (  const PictureCompressor &  cpy  )  [private]

Copy constructor is private and body-less. This class should not be copied.

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Member Function Documentation

void dirac::PictureCompressor::AddSubAverage (  CoeffArray &  coeff_data, int  xl, int  yl, AddOrSub  dirn )  [private]

void dirac::PictureCompressor::CalcComplexity (  EncQueue &  my_buffer, int  pnum, const OLBParams &  olbparams )

void dirac::PictureCompressor::CalcComplexity2 (  EncQueue &  my_buffer, int  pnum )

void dirac::PictureCompressor::CodeMVData (  EncQueue &  my_buffer, int  pnum, PictureByteIO *  pic_byteio )

void dirac::PictureCompressor::CodeResidue (  EncQueue &  my_pbuffer, int  pnum, PictureByteIO *  pic_byteio )

Compresses a specified picture within a group of pictures. Parameters: my_pbuffer  picture buffer in which the reference frames resides pnum  picture number to compress pic_byteio  compressed picture in Dirac bytestream format

void dirac::PictureCompressor::DoDWT (  EncQueue &  my_buffer, int  pnum, Direction  dirn )

float dirac::PictureCompressor::GetCompLambda (  const EncPicture &  my_picture, const CompSort  csort )  [private]

const MEData* dirac::PictureCompressor::GetMEData (   )  const

void dirac::PictureCompressor::InitCoeffData (  CoeffArray &  coeff_data, const int  xl, const int  yl )  [private]

void dirac::PictureCompressor::IntraModeAnalyse (  EncQueue &  my_buffer, int  pnum )

bool dirac::PictureCompressor::IsMEDataAvail (   )  const [inline]

bool dirac::PictureCompressor::IsSkipped (   )  [inline]

void dirac::PictureCompressor::ModeDecisionME (  EncQueue &  my_buffer, int  pnum )

void dirac::PictureCompressor::MotionCompensate (  EncQueue &  my_buffer, int  pnum, AddOrSub  dirn )

void dirac::PictureCompressor::NormaliseComplexity (  EncQueue &  my_buffer, int  pnum )

PictureCompressor& dirac::PictureCompressor::operator= (  const PictureCompressor &  rhs  )  [private]

Assignment = is private and body-less. This class should not be assigned.

void dirac::PictureCompressor::PixelME (  EncQueue &  my_buffer, int  pnum )

void dirac::PictureCompressor::Prefilter (  EncQueue &  my_buffer, int  pnum )

int dirac::PictureCompressor::SelectMultiQuants (  CoeffArray &  coeff_data, SubbandList &  bands, const int  band_num, const float  lambda, const PictureParams &  pp, const CompSort  csort )  [private]

void dirac::PictureCompressor::SelectQuantisers (  CoeffArray &  coeff_data, SubbandList &  bands, const float  lambda, OneDArray< unsigned int > &  est_counts, const CodeBlockMode  cb_mode, const PictureParams &  pp, const CompSort  csort )  [private]

void dirac::PictureCompressor::SetupCodeBlocks (  SubbandList &  bands  )  [private]

void dirac::PictureCompressor::SubPixelME (  EncQueue &  my_buffer, int  pnum )

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Member Data Documentation

EncoderParams& dirac::PictureCompressor::m_encparams [private]

PredMode dirac::PictureCompressor::m_global_pred_mode [private]

bool dirac::PictureCompressor::m_is_a_cut [private]

MEData* dirac::PictureCompressor::m_me_data [private]

bool dirac::PictureCompressor::m_medata_avail [private]

MVPrecisionType dirac::PictureCompressor::m_orig_prec [private]

bool dirac::PictureCompressor::m_skipped [private]

bool dirac::PictureCompressor::m_use_block_mv [private]

bool dirac::PictureCompressor::m_use_global [private]

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

• picture_compress.h

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