TER.TERdecoder.BPEDecoder
Class ACEntropyDecoder

java.lang.Object
  TER.TERdecoder.BPEDecoder.ACEntropyDecoder

public class ACEntropyDecoder
extends java.lang.Object

Field Summary

(package private) int	channel
(package private) int[]	codeIdLength Definition in EncodeGaggleAC.codeIdLength
(package private) int[]	currentLayer
(package private) ReadBufferedStream[]	encodedStream
(package private) int	entropyAC Definition in EncodeGaggleAC.entropyAC
(package private) int	gaggle
(package private) int	generation
(package private) int[]	ids Definition in EncodeGaggleAC.ids
(package private) int[]	noCodeId Definition in EncodeGaggleAC.noCodeId
(package private) byte[][][][][]	packetStream
(package private) boolean	parametersSet To know if parameters are set.
(package private) int	segment

Constructor Summary

ACEntropyDecoder(byte[][][][][] packetStream)

Method Summary

private boolean	getBit() Gets a bit from the encoded bit stream
int	getBits(int length) private int getBits(int length) throws Exception{ return encodedStream[generation].getBits(length); }
private int	getFourLengthSymbol() Decodes the symbols with length 4
ReadBufferedStream	getLayerParents()
byte	getRecommededContext(int stage, int length, boolean impossiblePattern) Definition in CodeBlockAC.getRecommededContext(int, int, boolean)
private int	getThreeLengthSymbol() Decodes the symbols with length 3
private int	getTwoLengthSymbol() Decodes the symbols with length 2
int	getWord(int generation, int stage, int length, boolean impossiblePattern) Decodes a word according with the parameters given by the user
boolean	moreBitPlanes(int generation, int bitplane, int[] BP)
void	resetIDs()
void	setParameters(int channel, int segment, int gaggle, int resolutionLevels, int entropyAC)
private int	unMapSymbol(int symbol, byte context) Map symbols to words

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

encodedStream

ReadBufferedStream[] encodedStream

packetStream

byte[][][][][] packetStream

currentLayer

int[] currentLayer

entropyAC

int entropyAC

Definition in EncodeGaggleAC.entropyAC

parametersSet

boolean parametersSet

To know if parameters are set.

True indicates that they are set otherwise false.

ids

int[] ids

Definition in EncodeGaggleAC.ids

noCodeId

int[] noCodeId

Definition in EncodeGaggleAC.noCodeId

codeIdLength

int[] codeIdLength

Definition in EncodeGaggleAC.codeIdLength

generation

int generation

channel

int channel

segment

int segment

gaggle

int gaggle

Constructor Detail

ACEntropyDecoder

public ACEntropyDecoder(byte[][][][][] packetStream)

Method Detail

setParameters

public void setParameters(int channel,
                          int segment,
                          int gaggle,
                          int resolutionLevels,
                          int entropyAC)
                   throws java.lang.Exception

Throws:

java.lang.Exception

resetIDs

public void resetIDs()

getWord

public int getWord(int generation,
                   int stage,
                   int length,
                   boolean impossiblePattern)
            throws java.lang.Exception

Decodes a word according with the parameters given by the user

Parameters:

stage - indicates if the word corresponds to the significance encoding, the sign encoding or the refinement.

• 0- significance
• 1- sign
• 2- refinement

length - indicates the length of the word to be decoded

impossiblePattern - indicates whether all zeros is a possible pattern

Returns:

an integer that represented the decoded word

Throws:

java.lang.Exception - when something goes wrong (tipically reaching the end of the bit stream) and decoding process must be stoped

getTwoLengthSymbol

private int getTwoLengthSymbol()
                        throws java.lang.Exception

Decodes the symbols with length 2

Returns:

an integer representing the decoded symbol

Throws:

java.lang.Exception - when the bit stream is finished before decoding the symbol

getThreeLengthSymbol

private int getThreeLengthSymbol()
                          throws java.lang.Exception

Decodes the symbols with length 3

Returns:

an integer representing the decoded symbol

Throws:

java.lang.Exception - when the bit stream is finished before decoding the symbol

getFourLengthSymbol

private int getFourLengthSymbol()
                         throws java.lang.Exception

Decodes the symbols with length 4

Returns:

an integer representing the decoded symbol

Throws:

java.lang.Exception - when the bit stream is finished before decoding the symbol

getRecommededContext

public byte getRecommededContext(int stage,
                                 int length,
                                 boolean impossiblePattern)

Definition in CodeBlockAC.getRecommededContext(int, int, boolean)

unMapSymbol

private int unMapSymbol(int symbol,
                        byte context)

Map symbols to words

Parameters:

symbol - indicates the symbol to be mapped

context - indicates the kind of word to be decoded, i.e. the lenght and the encoding pass

Returns:

an integer that represents the decoded word

getBit

private boolean getBit()
                throws java.lang.Exception

Gets a bit from the encoded bit stream

Returns:

a bit

Throws:

java.lang.Exception - when is not possible get a bit from the bit stream

getBits

public int getBits(int length)
            throws java.lang.Exception

private int getBits(int length) throws Exception{ return encodedStream[generation].getBits(length); }

Throws:

java.lang.Exception

moreBitPlanes

public boolean moreBitPlanes(int generation,
                             int bitplane,
                             int[] BP)

getLayerParents

public ReadBufferedStream getLayerParents()