Package jj2000.j2k.entropy.decoder
Class EntropyDecoder
java.lang.Object
jj2000.j2k.wavelet.synthesis.MultiResImgDataAdapter
jj2000.j2k.entropy.decoder.EntropyDecoder
- All Implemented Interfaces:
CBlkQuantDataSrcDec,InvWTData,MultiResImgData
- Direct Known Subclasses:
StdEntropyDecoder
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.
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final charThe prefix for entropy decoder optiojns: 'C'protected CodedCBlkDataSrcDecThe bit stream transport from where to get the compressed data (the source)Fields inherited from class jj2000.j2k.wavelet.synthesis.MultiResImgDataAdapter
mressrc, tIdx -
Constructor Summary
ConstructorsConstructorDescriptionInitializes the source of compressed data. -
Method Summary
Modifier and TypeMethodDescriptionintgetCbULX()Returns the horizontal code-block partition origin.intgetCbULY()Returns the vertical code-block partition origin.static String[][]Returns the parameters that are used in this class and implementing classes.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, setTileMethods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitMethods inherited from interface jj2000.j2k.quantization.dequantizer.CBlkQuantDataSrcDec
getCodeBlock, getInternCodeBlockMethods 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 Details
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OPT_PREFIX
public static final char OPT_PREFIXThe prefix for entropy decoder optiojns: 'C'- See Also:
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src
The bit stream transport from where to get the compressed data (the source)
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Constructor Details
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EntropyDecoder
Initializes the source of compressed data.- Parameters:
src- From where to obtain the compressed data.
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Method Details
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getSynSubbandTree
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:
getSynSubbandTreein interfaceInvWTData- Specified by:
getSynSubbandTreein 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. -
getCbULY
public int getCbULY()Returns the vertical code-block partition origin. Allowable values are 0 and 1, nothing else. -
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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