236 lines
8.1 KiB
C
236 lines
8.1 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) 2001-2002 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 License Version 2.0
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*
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* Copyright (c) 2001-2006 Michael David Adams
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* Copyright (c) 1999-2000 Image Power, Inc.
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* Copyright (c) 1999-2000 The University of British Columbia
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*
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person (the
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* "User") obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, and/or sell copies of the Software, and to permit
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* persons to whom the Software is furnished to do so, subject to the
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* following conditions:
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*
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* 1. The above copyright notices and this permission notice (which
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* includes the disclaimer below) shall be included in all copies or
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* substantial portions of the Software.
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*
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* 2. The name of a copyright holder shall not be used to endorse or
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* promote products derived from the Software without specific prior
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* written permission.
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*
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* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
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* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
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* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
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* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
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* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
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* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
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* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
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* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
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* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
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* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
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* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
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* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
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* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
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* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
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* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
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* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
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* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
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* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
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* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
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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 Encoder
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*
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* $Id: jpc_mqenc.h,v 1.2 2008-05-26 09:40:52 vp153 Exp $
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*/
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#ifndef JPC_MQENC_H
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#define JPC_MQENC_H
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/******************************************************************************\
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* Includes.
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\******************************************************************************/
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#include "jasper/jas_types.h"
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#include "jasper/jas_stream.h"
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#include "jpc_mqcod.h"
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/******************************************************************************\
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* Constants.
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\******************************************************************************/
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/*
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* Termination modes.
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*/
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#define JPC_MQENC_DEFTERM 0 /* default termination */
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#define JPC_MQENC_PTERM 1 /* predictable termination */
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/******************************************************************************\
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* Types.
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\******************************************************************************/
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/* MQ arithmetic encoder class. */
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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 maximum number of contexts. */
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int maxctxs;
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/* The per-context information. */
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jpc_mqstate_t **ctxs;
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/* The current context. */
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jpc_mqstate_t **curctx;
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/* The stream for encoder output. */
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jas_stream_t *out;
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/* The byte buffer (i.e., the B variable in the standard). */
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int_fast16_t outbuf;
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/* The last byte output. */
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int_fast16_t lastbyte;
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/* The error indicator. */
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int err;
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} jpc_mqenc_t;
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/* MQ arithmetic encoder state information. */
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typedef struct {
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/* The A register. */
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unsigned areg;
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/* The C register. */
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unsigned creg;
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/* The CT register. */
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unsigned ctreg;
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/* The last byte output by the encoder. */
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int lastbyte;
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} jpc_mqencstate_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 encoder. */
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jpc_mqenc_t *jpc_mqenc_create(int maxctxs, jas_stream_t *out);
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/* Destroy a MQ encoder. */
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void jpc_mqenc_destroy(jpc_mqenc_t *enc);
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/******************************************************************************\
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* Functions/macros for initialization.
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\******************************************************************************/
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/* Initialize a MQ encoder. */
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void jpc_mqenc_init(jpc_mqenc_t *enc);
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/******************************************************************************\
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* Functions/macros for context manipulation.
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\******************************************************************************/
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/* Set the current context. */
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#define jpc_mqenc_setcurctx(enc, ctxno) \
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((enc)->curctx = &(enc)->ctxs[ctxno]);
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/* Set the state information for a particular context. */
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void jpc_mqenc_setctx(jpc_mqenc_t *enc, int ctxno, jpc_mqctx_t *ctx);
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/* Set the state information for multiple contexts. */
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void jpc_mqenc_setctxs(jpc_mqenc_t *enc, int numctxs, jpc_mqctx_t *ctxs);
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/******************************************************************************\
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* Miscellaneous functions/macros.
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\******************************************************************************/
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/* Get the error state of a MQ encoder. */
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#define jpc_mqenc_error(enc) \
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((enc)->err)
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/* Get the current encoder state. */
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void jpc_mqenc_getstate(jpc_mqenc_t *enc, jpc_mqencstate_t *state);
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/* Terminate the code. */
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int jpc_mqenc_flush(jpc_mqenc_t *enc, int termmode);
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/******************************************************************************\
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* Functions/macros for encoding bits.
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\******************************************************************************/
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/* Encode a bit. */
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#if !defined(DEBUG)
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#define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_macro(enc, bit)
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#else
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#define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_func(enc, bit)
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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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int jpc_mqenc_dump(jpc_mqenc_t *mqenc, FILE *out);
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/******************************************************************************\
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* Implementation-specific details.
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\******************************************************************************/
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/* Note: This macro is included only to satisfy the needs of
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the mqenc_putbit macro. */
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#define jpc_mqenc_putbit_macro(enc, bit) \
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(((*((enc)->curctx))->mps == (bit)) ? \
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(((enc)->areg -= (*(enc)->curctx)->qeval), \
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((!((enc)->areg & 0x8000)) ? (jpc_mqenc_codemps2(enc)) : \
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((enc)->creg += (*(enc)->curctx)->qeval))) : \
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jpc_mqenc_codelps(enc))
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/* Note: These function prototypes are included only to satisfy the
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needs of the mqenc_putbit_macro macro. Do not call any of these
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functions directly. */
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int jpc_mqenc_codemps2(jpc_mqenc_t *enc);
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int jpc_mqenc_codelps(jpc_mqenc_t *enc);
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/* Note: This function prototype is included only to satisfy the needs of
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the mqenc_putbit macro. */
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int jpc_mqenc_putbit_func(jpc_mqenc_t *enc, int bit);
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#endif
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