C# Класс CSJ2K.j2k.codestream.reader.PktDecoder

This class is used to read packet's head and body. All the members must be re-initialized at the beginning of each tile thanks to the restart() method.

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Открытые методы

Метод	Описание
PktDecoder ( DecoderSpecs decSpec, HeaderDecoder hd, RandomAccessIO ehs, BitstreamReaderAgent src, bool isTruncMode, int maxCB ) : System	Creates an empty PktDecoder object associated with given decoder specifications and HeaderDecoder. This object must be initialized thanks to the restart method before being used.
getNumPrecinct ( int c, int r ) : int	Gets the number of precincts in a given component and resolution level.
getPPX ( int t, int c, int r ) : int	Returns the precinct partition width for the specified component, resolution level and tile.
getPPY ( int t, int c, int rl ) : int	Returns the precinct partition height for the specified component, resolution level and tile.
getPrecInfo ( int c, int r, int p ) : CSJ2K.j2k.codestream.PrecInfo	Get PrecInfo instance of the specified resolution level, component and precinct.
readEPHMarker ( CSJ2K.j2k.codestream.reader.PktHeaderBitReader bin ) : void	Try to read an EPH marker. If it is not possible then an Error is thrown.
readPktBody ( int l, int r, int c, int p, CSJ2K.j2k.codestream.reader.CBlkInfo cbI, int nb ) : bool	Reads specificied packet body in order to find offset of each code-block's piece of codeword. This use the list of found code-blocks in previous red packet head.
readPktHead ( int l, int r, int c, int p, CSJ2K.j2k.codestream.reader.CBlkInfo cbI, int nb ) : bool	Read specified packet head and found length of each code-block's piece of codewords as well as number of skipped most significant bit-planes.
readSOPMarker ( int nBytes, int p, int c, int r ) : bool	Try to read a SOP marker and check that its sequence number if not out of sequence. If so, an error is thrown.
restart ( int nc, int mdl, int nl, CSJ2K.j2k.codestream.reader.CBlkInfo cbI, bool pph, System pphbais ) : CSJ2K.j2k.codestream.reader.CBlkInfo[][][][][]	Re-initialize the PktDecoder instance at the beginning of a new tile.

Приватные методы

Метод	Описание
fillPrecInfo ( int c, int r, int mdl ) : void	Retrives precincts and code-blocks coordinates in the given resolution, level and component. Finishes TagTreeEncoder initialization as well.

Описание методов

PktDecoder() публичный Метод

Creates an empty PktDecoder object associated with given decoder specifications and HeaderDecoder. This object must be initialized thanks to the restart method before being used.

public PktDecoder ( DecoderSpecs decSpec, HeaderDecoder hd, RandomAccessIO ehs, BitstreamReaderAgent src, bool isTruncMode, int maxCB ) : System
decSpec	CSJ2K.j2k.decoder.DecoderSpecs	The decoder specifications. /// ///
hd	HeaderDecoder	The HeaderDecoder instance. /// ///
ehs	RandomAccessIO	The stream where to read data from. /// ///
src	BitstreamReaderAgent	The bit stream reader agent. /// ///
isTruncMode	bool	Whether or not truncation mode is required. /// ///
maxCB	int	The maximum number of code-blocks to read before ncbquit /// /// ///
Результат	System

getNumPrecinct() публичный Метод

Gets the number of precincts in a given component and resolution level.

public getNumPrecinct ( int c, int r ) : int
c	int	Component index /// ///
r	int	Resolution index /// ///
Результат	int

getPPX() публичный Метод

Returns the precinct partition width for the specified component, resolution level and tile.

public getPPX ( int t, int c, int r ) : int
t	int	the tile index /// ///
c	int	The index of the component (between 0 and C-1) /// ///
r	int	The resolution level, from 0 to L. /// ///
Результат	int

getPPY() публичный Метод

Returns the precinct partition height for the specified component, resolution level and tile.

public getPPY ( int t, int c, int rl ) : int
t	int	the tile index /// ///
c	int	The index of the component (between 0 and C-1) /// ///
rl	int	The resolution level, from 0 to L. /// ///
Результат	int

getPrecInfo() публичный Метод

Get PrecInfo instance of the specified resolution level, component and precinct.

public getPrecInfo ( int c, int r, int p ) : CSJ2K.j2k.codestream.PrecInfo
c	int	Component index. /// ///
r	int	Resolution level index. /// ///
p	int	Precinct index. /// ///
Результат	CSJ2K.j2k.codestream.PrecInfo

readEPHMarker() публичный Метод

Try to read an EPH marker. If it is not possible then an Error is thrown.

public readEPHMarker ( CSJ2K.j2k.codestream.reader.PktHeaderBitReader bin ) : void
bin	CSJ2K.j2k.codestream.reader.PktHeaderBitReader	The packet header reader to read the EPH marker from /// ///
Результат	void

readPktBody() публичный Метод

Reads specificied packet body in order to find offset of each code-block's piece of codeword. This use the list of found code-blocks in previous red packet head.

public readPktBody ( int l, int r, int c, int p, CSJ2K.j2k.codestream.reader.CBlkInfo cbI, int nb ) : bool
l	int	layer index /// ///
r	int	Resolution level index /// ///
c	int	Component index /// ///
p	int	Precinct index /// ///
cbI	CSJ2K.j2k.codestream.reader.CBlkInfo	CBlkInfo array of relevant component and resolution /// level. /// ///
nb	int	The remainding number of bytes to read from the bit stream in /// each tile before reaching the decoding rate (in truncation mode) /// ///
Результат	bool

readPktHead() публичный Метод

Read specified packet head and found length of each code-block's piece of codewords as well as number of skipped most significant bit-planes.

public readPktHead ( int l, int r, int c, int p, CSJ2K.j2k.codestream.reader.CBlkInfo cbI, int nb ) : bool
l	int	layer index /// ///
r	int	Resolution level index /// ///
c	int	Component index /// ///
p	int	Precinct index /// ///
cbI	CSJ2K.j2k.codestream.reader.CBlkInfo	CBlkInfo array of relevant component and resolution /// level. /// ///
nb	int	The number of bytes to read in each tile before reaching /// output rate (used by truncation mode) /// ///
Результат	bool

readSOPMarker() публичный Метод

Try to read a SOP marker and check that its sequence number if not out of sequence. If so, an error is thrown.

public readSOPMarker ( int nBytes, int p, int c, int r ) : bool
nBytes	int	The number of bytes left to read from each tile /// ///
p	int	Precinct index /// ///
c	int	Component index /// ///
r	int	Resolution level index /// ///
Результат	bool

restart() публичный Метод

Re-initialize the PktDecoder instance at the beginning of a new tile.

public restart ( int nc, int mdl, int nl, CSJ2K.j2k.codestream.reader.CBlkInfo cbI, bool pph, System pphbais ) : CSJ2K.j2k.codestream.reader.CBlkInfo[][][][][]
nc	int	The number of components in this tile /// ///
mdl	int	The maximum number of decomposition level in each component /// of this tile /// ///
nl	int	The number of layers in this tile /// ///
cbI	CSJ2K.j2k.codestream.reader.CBlkInfo	The code-blocks array /// ///
pph	bool	Flag indicating whether packed packet headers was used /// ///
pphbais	System	Stream containing the packed packet headers /// ///
Результат	CSJ2K.j2k.codestream.reader.CBlkInfo[][][][][]