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java.lang.Objectucar.jpeg.jj2000.j2k.image.ImgDataAdapter
ucar.jpeg.jj2000.j2k.entropy.encoder.PostCompRateAllocator
ucar.jpeg.jj2000.j2k.entropy.encoder.EBCOTRateAllocator
public class EBCOTRateAllocator
This implements the EBCOT post compression rate allocation algorithm. This algorithm finds the most suitable truncation points for the set of code-blocks, for each layer target bitrate. It works by first collecting the rate distortion info from all code-blocks, in all tiles and all components, and then running the rate-allocation on the whole image at once, for each layer.
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.
PostCompRateAllocator
,
CodedCBlkDataSrcEnc
,
jj2000.j2k.codestream.writer.CodestreamWriter
Field Summary |
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Fields inherited from class ucar.jpeg.jj2000.j2k.entropy.encoder.PostCompRateAllocator |
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encSpec, numLayers, OPT_PREFIX, src |
Fields inherited from class ucar.jpeg.jj2000.j2k.image.ImgDataAdapter |
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imgdatasrc, tIdx |
Constructor Summary | |
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EBCOTRateAllocator(CodedCBlkDataSrcEnc src,
LayersInfo lyrs,
CodestreamWriter writer,
EncoderSpecs encSpec,
ParameterList pl)
Initializes the EBCOT rate allocator of entropy coded data. |
Method Summary | |
---|---|
void |
finalize()
Prints the timing information, if collected, and calls 'finalize' on the super class. |
void |
initialize()
Initializes the layers array. |
void |
runAndWrite()
Runs the rate allocation algorithm and writes the data to the bit stream writer object provided to the constructor. |
void |
writeCompPosResLy(int t,
int rs,
int re,
int cs,
int ce,
int[][] lys,
int lye)
Write a piece of bit stream according to the COMP_POS_RES_LY_PROG progression mode and between given bounds |
void |
writeLyResCompPos(int t,
int rs,
int re,
int cs,
int ce,
int[][] lys,
int lye)
Write a piece of bit stream according to the LY_RES_COMP_POS_PROG progression mode and between given bounds |
void |
writePosCompResLy(int t,
int rs,
int re,
int cs,
int ce,
int[][] lys,
int lye)
Write a piece of bit stream according to the COMP_POS_RES_LY_PROG progression mode and between given bounds |
void |
writeResLyCompPos(int t,
int rs,
int re,
int cs,
int ce,
int[][] lys,
int lye)
Write a piece of bit stream according to the RES_LY_COMP_POS_PROG progression mode and between given bounds |
void |
writeResPosCompLy(int t,
int rs,
int re,
int cs,
int ce,
int[][] lys,
int lye)
Write a piece of bit stream according to the RES_POS_COMP_LY_PROG progression mode and between given bounds |
Methods inherited from class ucar.jpeg.jj2000.j2k.entropy.encoder.PostCompRateAllocator |
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createInstance, getNumLayers, getParameterInfo, setHeaderEncoder |
Methods inherited from class ucar.jpeg.jj2000.j2k.image.ImgDataAdapter |
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getCompImgHeight, getCompImgWidth, getCompSubsX, getCompSubsY, getCompULX, getCompULY, getImgHeight, getImgULX, getImgULY, getImgWidth, getNomRangeBits, getNomTileHeight, getNomTileWidth, getNumComps, getNumTiles, getNumTiles, getTile, getTileCompHeight, getTileCompWidth, getTileHeight, getTileIdx, getTilePartULX, getTilePartULY, getTileWidth, nextTile, setTile |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public EBCOTRateAllocator(CodedCBlkDataSrcEnc src, LayersInfo lyrs, CodestreamWriter writer, EncoderSpecs encSpec, ParameterList pl)
src
- The source of entropy coded data.lyrs
- The layers layout specification.writer
- The bit stream writer.ProgressionType
Method Detail |
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public void finalize() throws Throwable
finalize
in class Object
Throwable
public void runAndWrite() throws IOException
runAndWrite
in class PostCompRateAllocator
IOException
PostCompRateAllocator.initialize()
public void initialize() throws IOException
initialize
in class PostCompRateAllocator
IOException
PostCompRateAllocator.runAndWrite()
public void writeResLyCompPos(int t, int rs, int re, int cs, int ce, int[][] lys, int lye) throws IOException
t
- Tile index.rs
- First resolution level index.re
- Last resolution level index.cs
- First component index.ce
- Last component index.lys
- First layer index for each component and resolution.lye
- Index of the last layer.
IOException
public void writeLyResCompPos(int t, int rs, int re, int cs, int ce, int[][] lys, int lye) throws IOException
t
- Tile index.rs
- First resolution level index.re
- Last resolution level index.cs
- First component index.ce
- Last component index.lys
- First layer index for each component and resolution.lye
- Index of the last layer.
IOException
public void writePosCompResLy(int t, int rs, int re, int cs, int ce, int[][] lys, int lye) throws IOException
t
- Tile index.rs
- First resolution level index.re
- Last resolution level index.cs
- First component index.ce
- Last component index.lys
- First layer index for each component and resolution.lye
- Index of the last layer.
IOException
public void writeCompPosResLy(int t, int rs, int re, int cs, int ce, int[][] lys, int lye) throws IOException
t
- Tile index.rs
- First resolution level index.re
- Last resolution level index.cs
- First component index.ce
- Last component index.lys
- First layer index for each component and resolution.lye
- Index of the last layer.
IOException
public void writeResPosCompLy(int t, int rs, int re, int cs, int ce, int[][] lys, int lye) throws IOException
t
- Tile index.rs
- First resolution level index.re
- Last resolution level index.cs
- First component index.ce
- Last component index.lys
- First layer index for each component and resolution.lye
- Last layer index.
IOException
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