corrade-vassal – Rev 1
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/*
* CVS identifier:
*
* $Id: EntropyCoder.java,v 1.58 2001/09/20 12:40:30 grosbois Exp $
*
* Class: EntropyCoder
*
* Description: The abstract class for entropy encoders
*
*
*
* COPYRIGHT:
*
* This software module was originally developed by Raphaël Grosbois and
* Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
* Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
* Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
* Centre France S.A) in the course of development of the JPEG2000
* standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
* software module is an implementation of a part of the JPEG 2000
* Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
* Systems AB and Canon Research Centre France S.A (collectively JJ2000
* Partners) agree not to assert against ISO/IEC and users of the JPEG
* 2000 Standard (Users) any of their rights under the copyright, not
* including other intellectual property rights, for this software module
* with respect to the usage by ISO/IEC and Users of this software module
* or modifications thereof for use in hardware or software products
* claiming conformance to the JPEG 2000 Standard. Those intending to use
* this software module in hardware or software products are advised that
* their use may infringe existing patents. The original developers of
* this software module, JJ2000 Partners and ISO/IEC assume no liability
* for use of this software module or modifications thereof. No license
* or right to this software module is granted for non JPEG 2000 Standard
* conforming products. JJ2000 Partners have full right to use this
* software module for his/her own purpose, assign or donate this
* software module to any third party and to inhibit third parties from
* using this software module for non JPEG 2000 Standard conforming
* products. This copyright notice must be included in all copies or
* derivative works of this software module.
*
* Copyright (c) 1999/2000 JJ2000 Partners.
* */
using System;
using CSJ2K.j2k.quantization.quantizer;
using CSJ2K.j2k.codestream.writer;
using CSJ2K.j2k.wavelet.analysis;
using CSJ2K.j2k.wavelet;
using CSJ2K.j2k.encoder;
using CSJ2K.j2k.entropy;
using CSJ2K.j2k.image;
using CSJ2K.j2k.util;
using CSJ2K.j2k.roi;
using CSJ2K.j2k;
namespace CSJ2K.j2k.entropy.encoder
{
/// <summary> This abstract class provides the general interface for block-based entropy
/// encoders. The input to the entropy coder is the quantized wavelet
/// coefficients, or codewords, represented in sign magnitude. The output is a
/// compressed code-block with rate-distortion information.
///
/// <p>The source of data for objects of this class are 'CBlkQuantDataSrcEnc'
/// objects.</p>
///
/// <p>For more details on the sign magnitude representation used see the
/// Quantizer class.</p>
///
/// <p>This class provides default implemenations for most of the methods
/// (wherever it makes sense), under the assumption that the image and
/// component dimensions, and the tiles, are not modifed by the entropy
/// coder. If that is not the case for a particular implementation then the
/// methods should be overriden.</p>
///
/// </summary>
/// <seealso cref="Quantizer">
/// </seealso>
/// <seealso cref="CBlkQuantDataSrcEnc">
///
/// </seealso>
public abstract class EntropyCoder:ImgDataAdapter, CodedCBlkDataSrcEnc
{
/// <summary> Returns the horizontal offset of the code-block partition. Allowable
/// values are 0 and 1, nothing else.
///
/// </summary>
virtual public int CbULX
{
get
{
return src.CbULX;
}
}
/// <summary> Returns the vertical offset of the code-block partition. Allowable
/// values are 0 and 1, nothing else.
///
/// </summary>
virtual public int CbULY
{
get
{
return src.CbULY;
}
}
/// <summary> 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, the third one is a long
/// description of what the parameter is and the fourth is its default
/// value. 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.
///
/// </summary>
/// <returns> the options name, their synopsis and their explanation, or null
/// if no options are supported.
///
/// </returns>
public static System.String[][] ParameterInfo
{
get
{
return pinfo;
}
}
/// <summary>The prefix for entropy coder options: 'C' </summary>
public const char OPT_PREFIX = 'C';
/// <summary>The list of parameters that is accepted for entropy coding. Options
/// for entropy coding start with 'C'.
/// </summary>
//UPGRADE_NOTE: Final was removed from the declaration of 'pinfo'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
private static readonly System.String[][] pinfo = new System.String[][]{new System.String[]{"Cblksiz", "[<tile-component idx>] <width> <height> " + "[[<tile-component idx>] <width> <height>]", "Specifies the maximum code-block size to use for tile-component. " + "The maximum width and height is 1024, however the surface area " + "(i.e. width x height) must not exceed 4096. The minimum width and " + "height is 4.", "64 64"}, new System.String[]{"Cbypass", "[<tile-component idx>] on|off" + "[ [<tile-component idx>] on|off ...]", "Uses the lazy coding mode with the entropy coder. This will bypass " + "the MQ coder for some of the coding passes, where the distribution " + "is often close to uniform. Since the MQ codeword will be " + "terminated " + "at least once per lazy pass, it is important to use an efficient " + "termination algorithm, see the 'Cterm_type' option." + "'on' enables, 'off' disables it.", "off"}, new System.String[]{"CresetMQ", "[<tile-component idx>] on|off" + "[ [<tile-component idx>] on|off ...]", "If this is enabled the probability estimates of the MQ coder are " + "reset after each arithmetically coded (i.e. non-lazy) coding pass. " + "'on' enables, 'off' disables it.", "off"}, new System.String[]{"Cterminate", "[<tile-component idx>] on|off" + "[ [<tile-component idx>] on|off ...]", "If this is enabled the codeword (raw or MQ) is terminated on a " + "byte boundary after each coding pass. In this case it is important " + "to use an efficient termination algorithm, see the 'Cterm' option. " + "'on' enables, 'off' disables it.", "off"}, new System.String[]{"Ccausal", "[<;tile-component idx>] on|off" + "[ [<tile-component idx>] on|off ...]", "Uses vertically stripe causal context formation. If this is " + "enabled " + "the context formation process in one stripe is independant of the " + "next stripe (i.e. the one below it). 'on' " + "enables, 'off' disables it.", "off"}, new System.String[]{"Cseg_symbol", "[<tile-component idx>] on|off" + "[ [<tile-component idx>] on|off ...]",
"Inserts an error resilience segmentation symbol in the MQ " + "codeword at the end of " + "each bit-plane (cleanup pass). Decoders can use this " + "information to detect and " + "conceal errors.'on' enables, 'off' disables " + "it.", "off"}, new System.String[]{"Cterm_type", "[<tile-component idx>] near_opt|easy|predict|full" + "[ [<tile-component idx>] near_opt|easy|predict|full ...]", "Specifies the algorithm used to terminate the MQ codeword. " + "The most efficient one is 'near_opt', which delivers a codeword " + "which in almost all cases is the shortest possible. The 'easy' is " + "a simpler algorithm that delivers a codeword length that is close " + "to the previous one (in average 1 bit longer). The 'predict' is" + " almost " + "the same as the 'easy' but it leaves error resilient information " + "on " + "the spare least significant bits (in average 3.5 bits), which can " + "be used by a decoder to detect errors. The 'full' algorithm " + "performs a full flush of the MQ coder and is highly inefficient.\n" + "It is important to use a good termination policy since the MQ " + "codeword can be terminated quite often, specially if the 'Cbypass'" + " or " + "'Cterminate' options are enabled (in the normal case it would be " + "terminated once per code-block, while if 'Cterminate' is specified " + "it will be done almost 3 times per bit-plane in each code-block).", "near_opt"}, new System.String[]{"Clen_calc", "[<tile-component idx>] near_opt|lazy_good|lazy" + "[ [<tile-component idx>] ...]", "Specifies the algorithm to use in calculating the necessary MQ " + "length for each decoding pass. The best one is 'near_opt', which " + "performs a rather sophisticated calculation and provides the best " + "results. The 'lazy_good' and 'lazy' are very simple algorithms " + "that " + "provide rather conservative results, 'lazy_good' one being " + "slightly " + "better. Do not change this option unless you want to experiment " + "the effect of different length calculation algorithms.", "near_opt"}, new
System.String[]{"Cpp", "[<tile-component idx>] <dim> <dim> [<dim> <dim>] " + "[ [<tile-component idx>] ...]", "Specifies precinct partition dimensions for tile-component. The " + "first " + "two values apply to the highest resolution and the following ones " + "(if " + "any) apply to the remaining resolutions in decreasing order. If " + "less " + "values than the number of decomposition levels are specified, " + "then the " + "last two values are used for the remaining resolutions.", null}};
/// <summary>The source of quantized wavelet coefficients </summary>
protected internal CBlkQuantDataSrcEnc src;
/// <summary> Initializes the source of quantized wavelet coefficients.
///
/// </summary>
/// <param name="src">The source of quantized wavelet coefficients.
///
/// </param>
public EntropyCoder(CBlkQuantDataSrcEnc src):base(src)
{
this.src = src;
}
/// <summary> Returns the code-block width for the specified tile and component.
///
/// </summary>
/// <param name="t">The tile index
///
/// </param>
/// <param name="c">the component index
///
/// </param>
/// <returns> The code-block width for the specified tile and component
///
/// </returns>
public abstract int getCBlkWidth(int t, int c);
/// <summary> Returns the code-block height for the specified tile and component.
///
/// </summary>
/// <param name="t">The tile index
///
/// </param>
/// <param name="c">the component index
///
/// </param>
/// <returns> The code-block height for the specified tile and component
///
/// </returns>
public abstract int getCBlkHeight(int t, int c);
/// <summary> Returns the reversibility of the tile-component data that is provided
/// by the object. Data is reversible when it is suitable for lossless and
/// lossy-to-lossless compression.
///
/// <P>Since entropy coders themselves are always reversible, it returns
/// the reversibility of the data that comes from the 'CBlkQuantDataSrcEnc'
/// source object (i.e. ROIScaler).
///
/// </summary>
/// <param name="t">Tile index
///
/// </param>
/// <param name="c">Component index
///
/// </param>
/// <returns> true is the data is reversible, false if not.
///
/// </returns>
/// <seealso cref="jj2000.j2k.roi.encoder.ROIScaler">
///
/// </seealso>
public virtual bool isReversible(int t, int c)
{
return src.isReversible(t, c);
}
/// <summary> Returns a reference to the root of subband tree structure representing
/// the subband decomposition for the specified tile-component.
///
/// </summary>
/// <param name="t">The index of the tile.
///
/// </param>
/// <param name="c">The index of the component.
///
/// </param>
/// <returns> The root of the subband tree structure, see Subband.
///
/// </returns>
/// <seealso cref="SubbandAn">
///
/// </seealso>
/// <seealso cref="Subband">
///
/// </seealso>
public virtual SubbandAn getAnSubbandTree(int t, int c)
{
return src.getAnSubbandTree(t, c);
}
/// <summary> Creates a EntropyCoder object for the appropriate entropy coding
/// parameters in the parameter list 'pl', and having 'src' as the source
/// of quantized data.
///
/// </summary>
/// <param name="src">The source of data to be entropy coded
///
/// </param>
/// <param name="pl">The parameter list (or options).
///
/// </param>
/// <param name="cbks">Code-block size specifications
///
/// </param>
/// <param name="pss">Precinct partition specifications
///
/// </param>
/// <param name="bms">By-pass mode specifications
///
/// </param>
/// <param name="mqrs">MQ-reset specifications
///
/// </param>
/// <param name="rts">Regular termination specifications
///
/// </param>
/// <param name="css">Causal stripes specifications
///
/// </param>
/// <param name="sss">Error resolution segment symbol use specifications
///
/// </param>
/// <param name="lcs">Length computation specifications
///
/// </param>
/// <param name="tts">Termination type specifications
///
/// </param>
/// <exception cref="IllegalArgumentException">If an error occurs while parsing
/// the options in 'pl'
///
/// </exception>
public static EntropyCoder createInstance(CBlkQuantDataSrcEnc src, ParameterList pl, CBlkSizeSpec cblks, PrecinctSizeSpec pss, StringSpec bms, StringSpec mqrs, StringSpec rts, StringSpec css, StringSpec sss, StringSpec lcs, StringSpec tts)
{
// Check parameters
pl.checkList(OPT_PREFIX, CSJ2K.j2k.util.ParameterList.toNameArray(pinfo));
return new StdEntropyCoder(src, cblks, pss, bms, mqrs, rts, css, sss, lcs, tts);
}
public abstract CSJ2K.j2k.entropy.encoder.CBlkRateDistStats getNextCodeBlock(int param1, CSJ2K.j2k.entropy.encoder.CBlkRateDistStats param2);
public abstract bool precinctPartitionUsed(int param1, int param2);
public abstract int getPPX(int param1, int param2, int param3);
public abstract int getPPY(int param1, int param2, int param3);
}
}
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