Package jj2000.j2k.entropy.decoder
Class EntropyDecoder
- java.lang.Object
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- jj2000.j2k.wavelet.synthesis.MultiResImgDataAdapter
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- jj2000.j2k.entropy.decoder.EntropyDecoder
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- All Implemented Interfaces:
CBlkQuantDataSrcDec
,InvWTData
,MultiResImgData
- Direct Known Subclasses:
StdEntropyDecoder
public abstract class EntropyDecoder extends MultiResImgDataAdapter implements CBlkQuantDataSrcDec
This is the abstract class from which all entropy decoders must inherit. This class implements the 'MultiResImgData', therefore it has the concept of a current tile and all operations are performed on the current tile.Default implementations of the methods in 'MultiResImgData' are provided through the 'MultiResImgDataAdapter' abstract class.
Sign magnitude representation is used (instead of two's complement) for the output data. The most significant bit is used for the sign (0 if positive, 1 if negative). Then the magnitude of the quantized coefficient is stored in the next most significat bits. The most significant magnitude bit corresponds to the most significant bit-plane and so on.
- See Also:
MultiResImgData
,MultiResImgDataAdapter
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Field Summary
Fields Modifier and Type Field Description static char
OPT_PREFIX
The prefix for entropy decoder optiojns: 'C'protected CodedCBlkDataSrcDec
src
The bit stream transport from where to get the compressed data (the source)-
Fields inherited from class jj2000.j2k.wavelet.synthesis.MultiResImgDataAdapter
mressrc, tIdx
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Constructor Summary
Constructors Constructor Description EntropyDecoder(CodedCBlkDataSrcDec src)
Initializes the source of compressed data.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getCbULX()
Returns the horizontal code-block partition origin.int
getCbULY()
Returns the vertical code-block partition origin.static String[][]
getParameterInfo()
Returns the parameters that are used in this class and implementing classes.SubbandSyn
getSynSubbandTree(int t, int c)
Returns the subband tree, for the specified tile-component.-
Methods inherited from class jj2000.j2k.wavelet.synthesis.MultiResImgDataAdapter
getCompImgHeight, getCompImgWidth, getCompSubsX, getCompSubsY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getResULX, getResULY, getTile, getTileCompHeight, getTileCompWidth, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth, nextTile, setTile
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface jj2000.j2k.quantization.dequantizer.CBlkQuantDataSrcDec
getCodeBlock, getInternCodeBlock
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Methods inherited from interface jj2000.j2k.wavelet.synthesis.MultiResImgData
getCompImgHeight, getCompImgWidth, getCompSubsX, getCompSubsY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getResULX, getResULY, getTile, getTileCompHeight, getTileCompWidth, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth, nextTile, setTile
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Field Detail
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OPT_PREFIX
public static final char OPT_PREFIX
The prefix for entropy decoder optiojns: 'C'- See Also:
- Constant Field Values
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src
protected CodedCBlkDataSrcDec src
The bit stream transport from where to get the compressed data (the source)
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Constructor Detail
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EntropyDecoder
public EntropyDecoder(CodedCBlkDataSrcDec src)
Initializes the source of compressed data.- Parameters:
src
- From where to obtain the compressed data.
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Method Detail
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getSynSubbandTree
public SubbandSyn getSynSubbandTree(int t, int c)
Returns the subband tree, for the specified tile-component. This method returns the root element of the subband tree structure, see Subband and SubbandSyn. The tree comprises all the available resolution levels.The number of magnitude bits ('magBits' member variable) for each subband is not initialized.
- Specified by:
getSynSubbandTree
in interfaceInvWTData
- Specified by:
getSynSubbandTree
in interfaceMultiResImgData
- Parameters:
t
- The index of the tile, from 0 to T-1.c
- The index of the component, from 0 to C-1.- Returns:
- The root of the tree structure.
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getCbULX
public int getCbULX()
Returns the horizontal code-block partition origin. Allowable values are 0 and 1, nothing else.
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getCbULY
public int getCbULY()
Returns the vertical code-block partition origin. Allowable values are 0 and 1, nothing else.
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getParameterInfo
public static String[][] getParameterInfo()
Returns the parameters that are used in this class and implementing classes. It returns a 2D String array. Each of the 1D arrays is for a different option, and they have 3 elements. The first element is the option name, the second one is the synopsis and the third one is a long description of what the parameter is. The synopsis or description may be 'null', in which case it is assumed that there is no synopsis or description of the option, respectively. Null may be returned if no options are supported.- Returns:
- the options name, their synopsis and their explanation, or null if no options are supported.
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