public class StdEntropyDecoder extends EntropyDecoder implements StdEntropyCoderOptions
The code-blocks are rectangular and their dimensions must be powers of 2. Each dimension cannot be smaller than 4 and larger than 256. The product of the two dimensions (i.e. area of the code-block) cannot exceed 4096.
Context 0 of the MQ-coder is used as the uniform one (uniform, non-adaptive probability distribution). Context 1 is used for RLC coding. Contexts 2-10 are used for zero-coding (ZC), contexts 11-15 are used for sign-coding (SC) and contexts 16-18 are used for magnitude-refinement (MR).
This implementation also provides some timing features. They can be enabled by setting the 'DO_TIMING' constant of this class to true and recompiling. The timing uses the 'System.currentTimeMillis()' Java API call, which returns wall clock time, not the actual CPU time used. The timing results will be printed on the message output. Since the times reported are wall clock times and not CPU usage times they can not be added to find the total used time (i.e. some time might be counted in several places). When timing is disabled ('DO_TIMING' is false) there is no penalty if the compiler performs some basic optimizations. Even if not the penalty should be negligeable.
OPT_PREFIX, srcmressrc, tIdxFIRST_BYPASS_PASS_IDX, MAX_CB_AREA, MAX_CB_DIM, MIN_CB_DIM, NUM_EMPTY_PASSES_IN_MS_BP, NUM_NON_BYPASS_MS_BP, NUM_PASSES, OPT_BYPASS, OPT_PRED_TERM, OPT_RESET_MQ, OPT_SEG_SYMBOLS, OPT_TERM_PASS, OPT_VERT_STR_CAUSAL, STRIPE_HEIGHT| Constructor and Description |
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StdEntropyDecoder(CodedCBlkDataSrcDec src,
DecoderSpecs decSpec,
boolean doer,
boolean verber,
int mQuit)
Instantiates a new entropy decoder engine, with the specified source of
data, nominal block width and height.
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| Modifier and Type | Method and Description |
|---|---|
void |
finalize()
Prints the timing information, if collected, and calls 'finalize' on
the super class.
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DataBlk |
getCodeBlock(int c,
int m,
int n,
SubbandSyn sb,
DataBlk cblk)
Returns the specified code-block in the current tile for the specified
component, as a copy (see below).
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DataBlk |
getInternCodeBlock(int c,
int m,
int n,
SubbandSyn sb,
DataBlk cblk)
Returns the specified code-block in the current tile for the specified
component (as a reference or copy).
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getCbULX, getCbULY, getParameterInfo, getSynSubbandTreegetCompImgHeight, getCompImgWidth, getCompSubsX, getCompSubsY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getResULX, getResULY, getTile, getTileCompHeight, getTileCompWidth, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth, nextTile, setTileclone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitgetCompImgHeight, getCompImgWidth, getCompSubsX, getCompSubsY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getResULX, getResULY, getTile, getTileCompHeight, getTileCompWidth, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth, nextTile, setTilepublic StdEntropyDecoder(CodedCBlkDataSrcDec src, DecoderSpecs decSpec, boolean doer, boolean verber, int mQuit)
src - The source of dataopt - The options to use for this encoder. It is a mix of the
'OPT_TERM_PASS', 'OPT_RESET_MQ', 'OPT_VERT_STR_CAUSAL', 'OPT_BYPASS'
and 'OPT_SEG_SYMBOLS' option flags.doer - If true error detection will be performed, if any error
detection features have been enabled.verber - This flag indicates if the entropy decoder should be
verbose about bit stream errors that are detected and concealed.mQuit - the maximum number of bit planes to decode according to
the m quit conditionpublic void finalize()
throws Throwable
public DataBlk getCodeBlock(int c, int m, int n, SubbandSyn sb, DataBlk cblk)
The returned code-block may be progressive, which is indicated by the 'progressive' variable of the returned 'DataBlk' object. If a code-block is progressive it means that in a later request to this method for the same code-block it is possible to retrieve data which is a better approximation, since meanwhile more data to decode for the code-block could have been received. If the code-block is not progressive then later calls to this method for the same code-block will return the exact same data values.
The data returned by this method is always a copy of the internal data of this object, if any, and it can be modified "in place" without any problems after being returned. The 'offset' of the returned data is 0, and the 'scanw' is the same as the code-block width. See the 'DataBlk' class.
The 'ulx' and 'uly' members of the returned 'DataBlk' object contain the coordinates of the top-left corner of the block, with respect to the tile, not the subband.
getCodeBlock in interface CBlkQuantDataSrcDecc - The component for which to return the next code-block.m - The vertical index of the code-block to return, in the
specified subband.n - The horizontal index of the code-block to return, in the
specified subband.sb - The subband in which the code-block to return is.cblk - If non-null this object will be used to return the new
code-block. If null a new one will be allocated and returned. If the
"data" array of the object is non-null it will be reused, if possible,
to return the data.DataBlkpublic DataBlk getInternCodeBlock(int c, int m, int n, SubbandSyn sb, DataBlk cblk)
The returned code-block may be progressive, which is indicated by the 'progressive' variable of the returned 'DataBlk' object. If a code-block is progressive it means that in a later request to this method for the same code-block it is possible to retrieve data which is a better approximation, since meanwhile more data to decode for the code-block could have been received. If the code-block is not progressive then later calls to this method for the same code-block will return the exact same data values.
The data returned by this method can be the data in the internal buffer of this object, if any, and thus can not be modified by the caller. The 'offset' and 'scanw' of the returned data can be arbitrary. See the 'DataBlk' class.
The 'ulx' and 'uly' members of the returned 'DataBlk' object contain the coordinates of the top-left corner of the block, with respect to the tile, not the subband.
getInternCodeBlock in interface CBlkQuantDataSrcDecc - The component for which to return the next code-block.m - The vertical index of the code-block to return, in the
specified subband.n - The horizontal index of the code-block to return, in the
specified subband.sb - The subband in which the code-block to return is.cblk - If non-null this object will be used to return the new
code-block. If null a new one will be allocated and returned. If the
"data" array of the object is non-null it will be reused, if possible,
to return the data.DataBlkCopyright © 2015. All rights reserved.