declyrdcblk.java

来自「jpeg2000编解码」· Java 代码 · 共 137 行

/*
 * CVS identifier:
 *
 * $Id: DecLyrdCBlk.java,v 1.1.1.1 2002/07/22 09:26:49 grosbois Exp $
 *
 * Class:                   DecLyrdCBlk
 *
 * Description:             The coded (compressed) code-block
 *                          with layered organization for the decoder.
 *
 *
 *
 * COPYRIGHT:
 * 
 * This software module was originally developed by Rapha雔 Grosbois and
 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
 * Askel鰂 (Ericsson Radio Systems AB); and Bertrand Berthelot, David
 * Bouchard, F閘ix 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.
 * */
package jj2000.j2k.entropy.decoder;

import jj2000.j2k.entropy.*;

import security.*;

/**
 * This class stores coded (compressed) code-blocks that are organized in
 * layers. This object can contain either all code-block data (i.e. all
 * layers), or a subset of all the layers that make up the whole compressed
 * code-block. It is applicable to the decoder engine only. Some data of the
 * coded-block is stored in the super class, see CodedCBlk.
 *
 * <p>A code-block may have its progressive attribute set (i.e. the 'prog'
 * flag is true). If a code-block is progressive then it means that more data
 * for it may be obtained for an improved quality. If the progressive flag is
 * false then no more data is available from the source for this
 * code-block.</p>
 *
 * @see CodedCBlk
 * */
public class DecLyrdCBlk extends CodedCBlk {

    /** The horizontal coordinate of the upper-left corner of the code-block */
    public int ulx;

    /** The vertical coordinate of the upper left corner of the code-block */
    public int uly;

    /** The width of the code-block */
    public int w;

    /** The height of the code-block */
    public int h;

    /** The coded (compressed) data length. The data is stored in the 'data'
     * array (see super class).  */
    public int dl;

    /** The progressive flag, false by default (see above). */
    public boolean prog;

    /** The number of layers in the coded data. */
    public int nl;

    /** The index of the first truncation point returned */
    public int ftpIdx;

    /** The total number of truncation points from layer 1 to the last one in
     * this object. The number of truncation points in 'data' is
     * 'nTrunc-ftpIdx'. */
    public int nTrunc;

    /** Seed eventually found in the bit stream */
    public long seed = -1;

    /** Whether or not this code-block is or has to be scrambled */
    public boolean scrambled = false;

    /** Scrambling type (only valid if <tt>scrambled</tt> is true) */
    public int scramblingType = ScramblingTypes.NO_SCRAMBLING;

    /** First scrambled codewords */
    public int scrambOff = -1;

    /** The length of each terminated segment. If null then there is only one
     * terminated segment, and its length is 'dl'. The number of terminated
     * segments is to be deduced from 'ftpIdx', 'nTrunc' and the coding
     * options. This array contains all terminated segments from the 'ftpIdx'
     * truncation point, upto, and including, the 'nTrunc-1' truncation
     * point. Any data after 'nTrunc-1' is not included in any length. */
    public int tsLengths[];

    /** 
     * Object information in a string
     *
     * @return Information in a string
     * */
    public String toString(){
        String str= 
            "Coded code-block ("+m+","+n+"): "+skipMSBP+" MSB skipped, "+
            dl+" bytes, "+nTrunc+" truncation points, "+nl+" layers, "+
            "progressive="+prog+", ulx="+ulx+", uly="+uly+
            ", w="+w+", h="+h+", ftpIdx="+ftpIdx;
        if(tsLengths!=null){
            str += " {";
            for(int i=0; i<tsLengths.length; i++)
                str += " "+tsLengths[i];
            str += " }";
        }
        return str;
    }
}