stdentropycoderoptions.java

来自「jpeg2000编解码」· Java 代码 · 共 121 行

/* 
 * CVS identifier:
 * 
 * $Id: StdEntropyCoderOptions.java,v 1.1.1.1 2002/07/22 09:26:48 grosbois Exp $
 * 
 * Class:                   StdEntropyCoderOptions
 * 
 * Description:             Entropy coding engine of stripes in
 *                          code-blocks options
 * 
 * 
 * 
 * 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;

/**
 * This interface define the constants that identify the possible options for
 * the entropy coder, as well some fixed parameters of the JPEG 2000 entropy
 * coder.
 * */
public interface StdEntropyCoderOptions{

    /** The flag bit to indicate that selective arithmetic coding bypass
     * should be used.  In this mode, the significance propagation and
     * magnitude refinement passes bypass the arithmetic encoder in the fourth
     * bit-plane and latter ones (but not the cleanup pass). Note that the
     * transition between raw and AC segments needs terminations (whether or
     * not OPT_TERM_PASS is used). */
    public final static int OPT_BYPASS = 1;

    /** The flag bit to indicate that the MQ states for all contexts should be 
     * reset at the end of each (non-bypassed) coding pass. */
    public final static int OPT_RESET_MQ = 1<<1;

    /** The flag bit to indicate that a termination should be performed after
     * each coding pass.  Note that terminations are applied to both * *
     * arithmetically coded and bypassed (i.e. raw) passes . */
    public final static int OPT_TERM_PASS = 1<<2;

    /** The flag bit to indicate the vertically stripe-causal context
     * formation should be used. */
    public final static int OPT_VERT_STR_CAUSAL = 1<<3;

    /** The flag bit to indicate that error resilience info is embedded on MQ
     * termination. This corresponds to the predictable termination described
     * in Annex D.4.2 of the FDIS */
    public final static int OPT_PRED_TERM = 1<<4;

    /** The flag bit to indicate that an error resilience segmentation symbol
     * is to be inserted at the end of each cleanup coding pass. The
     * segmentation symbol is the four symbol sequence 1010 that are sent
     * through the MQ coder using the UNIFORM context (as explained in annex
     * D.5 of FDIS). */
    public final static int OPT_SEG_SYMBOLS = 1<<5;

    /** The minimum code-block dimension. The nominal width or height of a
     * code-block must never be less than this. It is 4. */
    public static final int MIN_CB_DIM = 4;

    /** The maximum code-block dimension. No code-block should be larger,
     * either in width or height, than this value. It is 1024. */
    public static final int MAX_CB_DIM = 1024;

    /** The maximum code-block area (width x height). The surface covered by
     * a nominal size block should never be larger than this. It is 4096 */
    public static final int MAX_CB_AREA = 4096;

    /** The stripe height. This is the nominal value of the stripe height. It
     * is 4. */
    public static final int STRIPE_HEIGHT = 4;

    /** The number of coding passes per bit-plane. This is the number of
     * passes per bit-plane. It is 3. */
    public static final int NUM_PASSES = 3;

    /** The number of most significant bit-planes where bypass mode is not to
     * be used, even if bypass mode is on: 4. */
    public static final int NUM_NON_BYPASS_MS_BP = 4;

    /** The number of empty passes in the most significant bit-plane. It is
        2. */
    public static final int NUM_EMPTY_PASSES_IN_MS_BP = 2;

    /** The index of the first "raw" pass, if bypass mode is on. */
    public static final int FIRST_BYPASS_PASS_IDX =
        NUM_PASSES*NUM_NON_BYPASS_MS_BP-NUM_EMPTY_PASSES_IN_MS_BP;

}