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271 lines
9.0 KiB
271 lines
9.0 KiB
/* |
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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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