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272 lines
9.0 KiB
C
272 lines
9.0 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 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 Decoder
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*
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* $Id: jpc_mqdec.h,v 1.2 2008-05-26 09:40:52 vp153 Exp $
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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/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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* 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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