317 lines
12 KiB
C
317 lines
12 KiB
C
/*
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* Copyright (c) 1999-2000 Image Power, Inc. and the University of
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* British Columbia.
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* Copyright (c) 2001-2003 Michael David Adams.
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* All rights reserved.
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*/
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/* __START_OF_JASPER_LICENSE__
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*
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* JasPer Software License
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*
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* IMAGE POWER JPEG-2000 PUBLIC LICENSE
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* ************************************
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*
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* GRANT:
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*
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* Permission is hereby granted, free of charge, to any person (the "User")
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* obtaining a copy of this software and associated documentation, to deal
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* in the JasPer Software without restriction, including without limitation
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* the right to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the JasPer Software (in source and binary forms),
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* and to permit persons to whom the JasPer Software is furnished to do so,
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* provided further that the License Conditions below are met.
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*
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* License Conditions
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* ******************
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*
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* A. Redistributions of source code must retain the above copyright notice,
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* and this list of conditions, and the following disclaimer.
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*
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* B. Redistributions in binary form must reproduce the above copyright
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* notice, and this list of conditions, and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* C. Neither the name of Image Power, Inc. nor any other contributor
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* (including, but not limited to, the University of British Columbia and
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* Michael David Adams) may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* D. User agrees that it shall not commence any action against Image Power,
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* Inc., the University of British Columbia, Michael David Adams, or any
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* other contributors (collectively "Licensors") for infringement of any
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* intellectual property rights ("IPR") held by the User in respect of any
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* technology that User owns or has a right to license or sublicense and
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* which is an element required in order to claim compliance with ISO/IEC
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* 15444-1 (i.e., JPEG-2000 Part 1). "IPR" means all intellectual property
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* rights worldwide arising under statutory or common law, and whether
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* or not perfected, including, without limitation, all (i) patents and
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* patent applications owned or licensable by User; (ii) rights associated
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* with works of authorship including copyrights, copyright applications,
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* copyright registrations, mask work rights, mask work applications,
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* mask work registrations; (iii) rights relating to the protection of
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* trade secrets and confidential information; (iv) any right analogous
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* to those set forth in subsections (i), (ii), or (iii) and any other
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* proprietary rights relating to intangible property (other than trademark,
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* trade dress, or service mark rights); and (v) divisions, continuations,
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* renewals, reissues and extensions of the foregoing (as and to the extent
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* applicable) now existing, hereafter filed, issued or acquired.
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*
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* E. If User commences an infringement action against any Licensor(s) then
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* such Licensor(s) shall have the right to terminate User's license and
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* all sublicenses that have been granted hereunder by User to other parties.
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*
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* F. The JPEG-2000 codec implementation included in the JasPer software
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* is for use only in hardware or software products that are compliant
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* with ISO/IEC 15444-1 (i.e., JPEG-2000 Part 1). No license or right to
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* this codec implementation is granted for products that do not comply
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* with ISO/IEC 15444-1.
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*
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* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE.
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* NO USE OF THE JASPER SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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* THIS DISCLAIMER. THE JASPER SOFTWARE IS PROVIDED BY THE LICENSORS AND
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* CONTRIBUTORS UNDER THIS LICENSE ON AN ``AS-IS'' BASIS, WITHOUT WARRANTY
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* OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION,
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* WARRANTIES THAT THE JASPER SOFTWARE IS FREE OF DEFECTS, IS MERCHANTABLE,
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* IS FIT FOR A PARTICULAR PURPOSE OR IS NON-INFRINGING. THOSE INTENDING
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* TO USE THE JASPER SOFTWARE OR MODIFICATIONS THEREOF FOR USE IN HARDWARE
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* OR SOFTWARE PRODUCTS ARE ADVISED THAT THEIR USE MAY INFRINGE EXISTING
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* PATENTS, COPYRIGHTS, TRADEMARKS, OR OTHER INTELLECTUAL PROPERTY RIGHTS.
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* THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE JASPER SOFTWARE
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* IS WITH THE USER. SHOULD ANY PART OF THE JASPER SOFTWARE PROVE DEFECTIVE
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* IN ANY RESPECT, THE USER (AND NOT THE INITIAL DEVELOPERS, THE UNIVERSITY
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* OF BRITISH COLUMBIA, IMAGE POWER, INC., MICHAEL DAVID ADAMS, OR ANY
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* OTHER CONTRIBUTOR) SHALL ASSUME THE COST OF ANY NECESSARY SERVICING,
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* REPAIR OR CORRECTION. UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY,
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* WHETHER TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL THE
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* INITIAL DEVELOPER, THE UNIVERSITY OF BRITISH COLUMBIA, IMAGE POWER, INC.,
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* MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE
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* JASPER SOFTWARE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO
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* THE USER OR ANY OTHER PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
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* CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION,
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* DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR
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* MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF
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* SUCH PARTY HAD BEEN INFORMED, OR OUGHT TO HAVE KNOWN, OF THE POSSIBILITY
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* OF SUCH DAMAGES. THE JASPER SOFTWARE AND UNDERLYING TECHNOLOGY ARE NOT
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* FAULT-TOLERANT AND ARE NOT DESIGNED, MANUFACTURED OR INTENDED FOR USE OR
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* RESALE AS ON-LINE CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING
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* FAIL-SAFE PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES,
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* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT
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* LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
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* JASPER SOFTWARE OR UNDERLYING TECHNOLOGY OR PRODUCT COULD LEAD DIRECTLY
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* TO DEATH, PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE
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* ("HIGH RISK ACTIVITIES"). LICENSOR SPECIFICALLY DISCLAIMS ANY EXPRESS
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* OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
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*
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*
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* __END_OF_JASPER_LICENSE__
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*/
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/*
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* MQ Arithmetic Decoder
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*
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* $Id$
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*/
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#ifndef JPC_MQDEC_H
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#define JPC_MQDEC_H
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/******************************************************************************\
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* Includes.
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\******************************************************************************/
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#include "jasper_inc/jas_types.h"
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#include "jasper_inc/jas_stream.h"
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#include "jpc_inc/jpc_mqcod.h"
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/******************************************************************************\
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* Types.
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\******************************************************************************/
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/* MQ arithmetic decoder. */
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typedef struct {
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/* The C register. */
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uint_fast32_t creg;
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/* The A register. */
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uint_fast32_t areg;
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/* The CT register. */
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uint_fast32_t ctreg;
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/* The current context. */
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jpc_mqstate_t **curctx;
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/* The per-context information. */
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jpc_mqstate_t **ctxs;
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/* The maximum number of contexts. */
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int maxctxs;
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/* The stream from which to read data. */
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jas_stream_t *in;
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/* The last character read. */
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uchar inbuffer;
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/* The EOF indicator. */
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int eof;
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} jpc_mqdec_t;
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/******************************************************************************\
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* Functions/macros for construction and destruction.
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\******************************************************************************/
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/* Create a MQ decoder. */
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jpc_mqdec_t *jpc_mqdec_create(int maxctxs, jas_stream_t *in);
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/* Destroy a MQ decoder. */
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void jpc_mqdec_destroy(jpc_mqdec_t *dec);
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/******************************************************************************\
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* Functions/macros for initialization.
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\******************************************************************************/
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/* Set the input stream associated with a MQ decoder. */
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void jpc_mqdec_setinput(jpc_mqdec_t *dec, jas_stream_t *in);
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/* Initialize a MQ decoder. */
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void jpc_mqdec_init(jpc_mqdec_t *dec);
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/******************************************************************************\
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* Functions/macros for manipulating contexts.
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\******************************************************************************/
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/* Set the current context for a MQ decoder. */
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#define jpc_mqdec_setcurctx(dec, ctxno) \
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((mqdec)->curctx = &(mqdec)->ctxs[ctxno]);
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/* Set the state information for a particular context of a MQ decoder. */
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void jpc_mqdec_setctx(jpc_mqdec_t *dec, int ctxno, jpc_mqctx_t *ctx);
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/* Set the state information for all contexts of a MQ decoder. */
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void jpc_mqdec_setctxs(jpc_mqdec_t *dec, int numctxs, jpc_mqctx_t *ctxs);
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/******************************************************************************\
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* Functions/macros for decoding bits.
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\******************************************************************************/
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/* Decode a symbol. */
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#if !defined(DEBUG)
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#define jpc_mqdec_getbit(dec) \
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jpc_mqdec_getbit_macro(dec)
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#else
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#define jpc_mqdec_getbit(dec) \
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jpc_mqdec_getbit_func(dec)
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#endif
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/* Decode a symbol (assuming an unskewed probability distribution). */
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#if !defined(DEBUG)
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#define jpc_mqdec_getbitnoskew(dec) \
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jpc_mqdec_getbit_macro(dec)
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#else
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#define jpc_mqdec_getbitnoskew(dec) \
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jpc_mqdec_getbit_func(dec)
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#endif
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/******************************************************************************\
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* Functions/macros for debugging.
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\******************************************************************************/
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/* Dump the MQ decoder state for debugging. */
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void jpc_mqdec_dump(jpc_mqdec_t *dec, FILE *out);
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/******************************************************************************\
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* EVERYTHING BELOW THIS POINT IS IMPLEMENTATION SPECIFIC AND NOT PART OF THE
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* APPLICATION INTERFACE. DO NOT RELY ON ANY OF THE INTERNAL FUNCTIONS/MACROS
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* GIVEN BELOW.
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\******************************************************************************/
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#define jpc_mqdec_getbit_macro(dec) \
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((((dec)->areg -= (*(dec)->curctx)->qeval), \
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(dec)->creg >> 16 >= (*(dec)->curctx)->qeval) ? \
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((((dec)->creg -= (*(dec)->curctx)->qeval << 16), \
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(dec)->areg & 0x8000) ? (*(dec)->curctx)->mps : \
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jpc_mqdec_mpsexchrenormd(dec)) : \
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jpc_mqdec_lpsexchrenormd(dec))
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#define jpc_mqdec_mpsexchange(areg, delta, curctx, bit) \
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{ \
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if ((areg) < (delta)) { \
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register jpc_mqstate_t *state = *(curctx); \
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/* LPS decoded. */ \
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(bit) = state->mps ^ 1; \
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*(curctx) = state->nlps; \
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} else { \
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register jpc_mqstate_t *state = *(curctx); \
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/* MPS decoded. */ \
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(bit) = state->mps; \
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*(curctx) = state->nmps; \
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} \
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}
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#define jpc_mqdec_lpsexchange(areg, delta, curctx, bit) \
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{ \
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if ((areg) >= (delta)) { \
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register jpc_mqstate_t *state = *(curctx); \
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(areg) = (delta); \
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(bit) = state->mps ^ 1; \
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*(curctx) = state->nlps; \
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} else { \
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register jpc_mqstate_t *state = *(curctx); \
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(areg) = (delta); \
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(bit) = state->mps; \
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*(curctx) = state->nmps; \
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} \
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}
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#define jpc_mqdec_renormd(areg, creg, ctreg, in, eof, inbuf) \
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{ \
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do { \
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if (!(ctreg)) { \
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jpc_mqdec_bytein2(creg, ctreg, in, eof, inbuf); \
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} \
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(areg) <<= 1; \
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(creg) <<= 1; \
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--(ctreg); \
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} while (!((areg) & 0x8000)); \
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}
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#define jpc_mqdec_bytein2(creg, ctreg, in, eof, inbuf) \
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{ \
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int c; \
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unsigned char prevbuf; \
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if (!(eof)) { \
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if ((c = jas_stream_getc(in)) == EOF) { \
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(eof) = 1; \
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c = 0xff; \
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} \
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prevbuf = (inbuf); \
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(inbuf) = c; \
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if (prevbuf == 0xff) { \
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if (c > 0x8f) { \
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(creg) += 0xff00; \
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(ctreg) = 8; \
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} else { \
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(creg) += c << 9; \
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(ctreg) = 7; \
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} \
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} else { \
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(creg) += c << 8; \
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(ctreg) = 8; \
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} \
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} else { \
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(creg) += 0xff00; \
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(ctreg) = 8; \
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} \
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}
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int jpc_mqdec_getbit_func(jpc_mqdec_t *dec);
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int jpc_mqdec_mpsexchrenormd(jpc_mqdec_t *dec);
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int jpc_mqdec_lpsexchrenormd(jpc_mqdec_t *dec);
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#endif
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