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ContextBase Class Reference

Abstract predecessor for all context classes used in arithmetic coding/decoding. More...

#include <contextbase.h>

Inheritance diagram for ContextBase:

List of all members.

Public Types
enum	OperationResult { Ok = 0, NotKnown = -1, TooManySymbols = -2, NoMemory = -3 }
	An enum with results of some contex operations. More...
Public Methods
	ContextBase (void)
	A constructor.
virtual void	setType (int, ContextType)=0
	Initialization of the context with given size and type.
virtual int	initialize (void)=0
	Initialize context.
virtual int	lastFixedSymbol (void)=0
	Return the value of last fixed symbol in the context.
virtual bool	isInitialized (void)
	Initialize context.
virtual void	setArithCodec (ArithCodec *ac)
	Set arithmetic coder for the context.
virtual int	encode (int)=0 throw (ExaltContextNotInitializedException, ExaltIOException)
	Encode symbol using given arithmetic coder/decoder.
virtual int	encodeEndOfMessage ()=0 throw (ExaltContextNotInitializedException, ExaltIOException)
	Encode the "end of message" symbol.
virtual int	decode (void)=0 throw (ExaltContextNotInitializedException, ExaltIOException)
	Decode symbol using given arithmetic coder/decoder.
virtual int	installSymbol (int)=0
	Install new symbol.
virtual void	purgeContext (void)=0
	Purge the context.
Public Attributes
int	endOfMessage
	The "end of message" symbol.
Protected Attributes
ArithCodec *	arithCodec
	Pointer to arithmetic codec.
bool	initialized
	Flag whether the context is initialized.

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Detailed Description

Abstract predecessor for all context classes used in arithmetic coding/decoding.

Definition at line 56 of file contextbase.h.

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Member Enumeration Documentation

enum ContextBase::OperationResult

An enum with results of some contex operations. Enumeration values: Ok  Everything was ok. NotKnown  Attempt to code unknown symbol. TooManySymbols  Could not install symbol. NoMemory  Memory exceeded during installing symbol. Definition at line 63 of file contextbase.h.

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

• contextbase.h

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