001/*
002 * $RCSfile: StdEntropyCoderOptions.java,v $
003 * $Revision: 1.1 $
004 * $Date: 2005/02/11 05:02:05 $
005 * $State: Exp $
006 *
007 * Class:                   StdEntropyCoderOptions
008 *
009 * Description:             Entropy coding engine of stripes in
010 *                          code-blocks options
011 *
012 *
013 *
014 * COPYRIGHT:
015 *
016 * This software module was originally developed by Raphaël Grosbois and
017 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
018 * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
019 * Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
020 * Centre France S.A) in the course of development of the JPEG2000
021 * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
022 * software module is an implementation of a part of the JPEG 2000
023 * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
024 * Systems AB and Canon Research Centre France S.A (collectively JJ2000
025 * Partners) agree not to assert against ISO/IEC and users of the JPEG
026 * 2000 Standard (Users) any of their rights under the copyright, not
027 * including other intellectual property rights, for this software module
028 * with respect to the usage by ISO/IEC and Users of this software module
029 * or modifications thereof for use in hardware or software products
030 * claiming conformance to the JPEG 2000 Standard. Those intending to use
031 * this software module in hardware or software products are advised that
032 * their use may infringe existing patents. The original developers of
033 * this software module, JJ2000 Partners and ISO/IEC assume no liability
034 * for use of this software module or modifications thereof. No license
035 * or right to this software module is granted for non JPEG 2000 Standard
036 * conforming products. JJ2000 Partners have full right to use this
037 * software module for his/her own purpose, assign or donate this
038 * software module to any third party and to inhibit third parties from
039 * using this software module for non JPEG 2000 Standard conforming
040 * products. This copyright notice must be included in all copies or
041 * derivative works of this software module.
042 *
043 * Copyright (c) 1999/2000 JJ2000 Partners.
044 * */
045
046
047package jj2000.j2k.entropy;
048
049/**
050 * This interface define the constants that identify the possible options for
051 * the entropy coder, as well some fixed parameters of the JPEG 2000 entropy
052 * coder.
053 * */
054public interface StdEntropyCoderOptions{
055
056    /** The flag bit to indicate that selective arithmetic coding bypass
057     * should be used. In this mode some of the coding passes bypass the
058     * arithmetic coder and raw bits are output. If this flag is turned on and
059     * the 'OPT_TERM_PASS' one is turned off then the any non-bypass coding
060     * pass before a bypass coding pass must use MQ termination. */
061    public final static int OPT_BYPASS = 1;
062
063    /** The flag bit to indicate that the MQ states for all contexts should be
064     * reset at the end of each non-bypass coding pass. */
065    public final static int OPT_RESET_MQ = 1<<1;
066
067    /** The flag bit to indicate that regular termination should be used. When
068     * this is specified termination is performed after each coding
069     * pass. Termination is applied to both arithmetically coded and bypass
070     * (i.e. raw) passes . */
071    public final static int OPT_TERM_PASS = 1<<2;
072
073    /** The flag bit to indicate the vertically stripe-causal context
074     * formation should be used. */
075    public final static int OPT_VERT_STR_CAUSAL = 1<<3;
076
077    /** The flag bit to indicate that error resilience info is embedded on MQ
078     * termination. The predictable error-resilient MQ termination at the
079     * encoder is necessary in this case. */
080    public final static int OPT_PRED_TERM = 1<<4;
081
082    /** The flag bit to indicate that a segmentation marker is to be
083     * inserted at the end of each normalization coding pass. The segment
084     * marker is the four symbol sequence 1010 that are sent through the MQ
085     * coder using the UNIFORM context. */
086    public final static int OPT_SEG_SYMBOLS = 1<<5;
087
088    /** The minimum code-block dimension. The nominal width or height of a
089     * code-block must never be less than this. It is 4. */
090    public static final int MIN_CB_DIM = 4;
091
092    /** The maximum code-block dimension. No code-block should be larger,
093     * either in width or height, than this value. It is 1024. */
094    public static final int MAX_CB_DIM = 1024;
095
096    /** The maximum code-block area (width x height). The surface covered by
097     * a nominal size block should never be larger than this. It is 4096 */
098    public static final int MAX_CB_AREA = 4096;
099
100    /** The stripe height. This is the nominal value of the stripe height. It
101     * is 4. */
102    public static final int STRIPE_HEIGHT = 4;
103
104    /** The number of coding passes per bit-plane. This is the number of
105     * passes per bit-plane. It is 3. */
106    public static final int NUM_PASSES = 3;
107
108    /** The number of most significant bit-planes where bypass mode is not to
109     * be used, even if bypass mode is on: 4. */
110    public static final int NUM_NON_BYPASS_MS_BP = 4;
111
112    /** The number of empty passes in the most significant bit-plane. It is
113        2. */
114    public static final int NUM_EMPTY_PASSES_IN_MS_BP = 2;
115
116    /** The index of the first "raw" pass, if bypass mode is on. */
117    public static final int FIRST_BYPASS_PASS_IDX =
118        NUM_PASSES*NUM_NON_BYPASS_MS_BP-NUM_EMPTY_PASSES_IN_MS_BP;
119
120}