Dirac - A Video Codec

Created by the British Broadcasting Corporation.

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dirac::Context Class Reference

#include <arith_codec.h>

Inheritance diagram for dirac::Context:

List of all members.

Public Member Functions

• Context ()

  Default Constructor.
  

• void SetCounts (unsigned int cnt0, unsigned int cnt1)

  Sets the counts according to the input.
  

• unsigned int Weight () const

  Returns the count of all symbols.
  

• void HalveCounts ()

  Divide the counts by 2, making sure neither ends up 0.
  

• unsigned int GetScaledProb0 () const

  Returns estimate of probability of 0 (false) scaled to 2**16.
  

• void Update (bool symbol)

  Updates context counts.
  

Private Attributes

• int m_count0
• int m_count1

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Constructor & Destructor Documentation

dirac::Context::Context

(

)

[inline]

Default constructor initialises counts to 1 each of 0 and 1.

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Member Function Documentation

int unsigned dirac::Context::GetScaledProb0

(

)

const [inline]

void dirac::Context::HalveCounts

(

)

[inline]

void dirac::Context::SetCounts	(	unsigned int	cnt0,
		unsigned int	cnt1
	)			[inline]

void dirac::Context::Update

(

bool

symbol

)

[inline]

unsigned int dirac::Context::Weight

(

)

const [inline]

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Member Data Documentation

int dirac::Context::m_count0 [private]

int dirac::Context::m_count1 [private]

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

• arith_codec.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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