mirror of https://github.com/opencv/opencv.git
Open Source Computer Vision Library
https://opencv.org/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
271 lines
8.6 KiB
271 lines
8.6 KiB
/* |
|
* Copyright (c) 1999-2000 Image Power, Inc. and the University of |
|
* British Columbia. |
|
* Copyright (c) 2001-2003 Michael David Adams. |
|
* All rights reserved. |
|
*/ |
|
|
|
/* __START_OF_JASPER_LICENSE__ |
|
* |
|
* JasPer License Version 2.0 |
|
* |
|
* Copyright (c) 2001-2006 Michael David Adams |
|
* Copyright (c) 1999-2000 Image Power, Inc. |
|
* Copyright (c) 1999-2000 The University of British Columbia |
|
* |
|
* All rights reserved. |
|
* |
|
* Permission is hereby granted, free of charge, to any person (the |
|
* "User") obtaining a copy of this software and associated documentation |
|
* files (the "Software"), to deal in the Software without restriction, |
|
* including without limitation the rights to use, copy, modify, merge, |
|
* publish, distribute, and/or sell copies of the Software, and to permit |
|
* persons to whom the Software is furnished to do so, subject to the |
|
* following conditions: |
|
* |
|
* 1. The above copyright notices and this permission notice (which |
|
* includes the disclaimer below) shall be included in all copies or |
|
* substantial portions of the Software. |
|
* |
|
* 2. The name of a copyright holder shall not be used to endorse or |
|
* promote products derived from the Software without specific prior |
|
* written permission. |
|
* |
|
* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS |
|
* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER |
|
* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS |
|
* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING |
|
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A |
|
* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO |
|
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL |
|
* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING |
|
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, |
|
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION |
|
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE |
|
* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE |
|
* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY. |
|
* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS |
|
* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL |
|
* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS |
|
* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE |
|
* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE |
|
* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL |
|
* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES, |
|
* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL |
|
* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH |
|
* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH, |
|
* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH |
|
* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY |
|
* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES. |
|
* |
|
* __END_OF_JASPER_LICENSE__ |
|
*/ |
|
|
|
/* |
|
* MQ Arithmetic Decoder |
|
* |
|
* $Id: jpc_mqdec.h,v 1.2 2008-05-26 09:40:52 vp153 Exp $ |
|
*/ |
|
|
|
#ifndef JPC_MQDEC_H |
|
#define JPC_MQDEC_H |
|
|
|
/******************************************************************************\ |
|
* Includes. |
|
\******************************************************************************/ |
|
|
|
#include "jasper/jas_types.h" |
|
#include "jasper/jas_stream.h" |
|
|
|
#include "jpc_mqcod.h" |
|
|
|
/******************************************************************************\ |
|
* Types. |
|
\******************************************************************************/ |
|
|
|
/* MQ arithmetic decoder. */ |
|
|
|
typedef struct { |
|
|
|
/* The C register. */ |
|
uint_fast32_t creg; |
|
|
|
/* The A register. */ |
|
uint_fast32_t areg; |
|
|
|
/* The CT register. */ |
|
uint_fast32_t ctreg; |
|
|
|
/* The current context. */ |
|
jpc_mqstate_t **curctx; |
|
|
|
/* The per-context information. */ |
|
jpc_mqstate_t **ctxs; |
|
|
|
/* The maximum number of contexts. */ |
|
int maxctxs; |
|
|
|
/* The stream from which to read data. */ |
|
jas_stream_t *in; |
|
|
|
/* The last character read. */ |
|
uchar inbuffer; |
|
|
|
/* The EOF indicator. */ |
|
int eof; |
|
|
|
} jpc_mqdec_t; |
|
|
|
/******************************************************************************\ |
|
* Functions/macros for construction and destruction. |
|
\******************************************************************************/ |
|
|
|
/* Create a MQ decoder. */ |
|
jpc_mqdec_t *jpc_mqdec_create(int maxctxs, jas_stream_t *in); |
|
|
|
/* Destroy a MQ decoder. */ |
|
void jpc_mqdec_destroy(jpc_mqdec_t *dec); |
|
|
|
/******************************************************************************\ |
|
* Functions/macros for initialization. |
|
\******************************************************************************/ |
|
|
|
/* Set the input stream associated with a MQ decoder. */ |
|
void jpc_mqdec_setinput(jpc_mqdec_t *dec, jas_stream_t *in); |
|
|
|
/* Initialize a MQ decoder. */ |
|
void jpc_mqdec_init(jpc_mqdec_t *dec); |
|
|
|
/******************************************************************************\ |
|
* Functions/macros for manipulating contexts. |
|
\******************************************************************************/ |
|
|
|
/* Set the current context for a MQ decoder. */ |
|
#define jpc_mqdec_setcurctx(dec, ctxno) \ |
|
((mqdec)->curctx = &(mqdec)->ctxs[ctxno]); |
|
|
|
/* Set the state information for a particular context of a MQ decoder. */ |
|
void jpc_mqdec_setctx(jpc_mqdec_t *dec, int ctxno, jpc_mqctx_t *ctx); |
|
|
|
/* Set the state information for all contexts of a MQ decoder. */ |
|
void jpc_mqdec_setctxs(jpc_mqdec_t *dec, int numctxs, jpc_mqctx_t *ctxs); |
|
|
|
/******************************************************************************\ |
|
* Functions/macros for decoding bits. |
|
\******************************************************************************/ |
|
|
|
/* Decode a symbol. */ |
|
#if !defined(DEBUG) |
|
#define jpc_mqdec_getbit(dec) \ |
|
jpc_mqdec_getbit_macro(dec) |
|
#else |
|
#define jpc_mqdec_getbit(dec) \ |
|
jpc_mqdec_getbit_func(dec) |
|
#endif |
|
|
|
/* Decode a symbol (assuming an unskewed probability distribution). */ |
|
#if !defined(DEBUG) |
|
#define jpc_mqdec_getbitnoskew(dec) \ |
|
jpc_mqdec_getbit_macro(dec) |
|
#else |
|
#define jpc_mqdec_getbitnoskew(dec) \ |
|
jpc_mqdec_getbit_func(dec) |
|
#endif |
|
|
|
/******************************************************************************\ |
|
* Functions/macros for debugging. |
|
\******************************************************************************/ |
|
|
|
/* Dump the MQ decoder state for debugging. */ |
|
void jpc_mqdec_dump(jpc_mqdec_t *dec, FILE *out); |
|
|
|
/******************************************************************************\ |
|
* EVERYTHING BELOW THIS POINT IS IMPLEMENTATION SPECIFIC AND NOT PART OF THE |
|
* APPLICATION INTERFACE. DO NOT RELY ON ANY OF THE INTERNAL FUNCTIONS/MACROS |
|
* GIVEN BELOW. |
|
\******************************************************************************/ |
|
|
|
#define jpc_mqdec_getbit_macro(dec) \ |
|
((((dec)->areg -= (*(dec)->curctx)->qeval), \ |
|
(dec)->creg >> 16 >= (*(dec)->curctx)->qeval) ? \ |
|
((((dec)->creg -= (*(dec)->curctx)->qeval << 16), \ |
|
(dec)->areg & 0x8000) ? (*(dec)->curctx)->mps : \ |
|
jpc_mqdec_mpsexchrenormd(dec)) : \ |
|
jpc_mqdec_lpsexchrenormd(dec)) |
|
|
|
#define jpc_mqdec_mpsexchange(areg, delta, curctx, bit) \ |
|
{ \ |
|
if ((areg) < (delta)) { \ |
|
register jpc_mqstate_t *state = *(curctx); \ |
|
/* LPS decoded. */ \ |
|
(bit) = state->mps ^ 1; \ |
|
*(curctx) = state->nlps; \ |
|
} else { \ |
|
register jpc_mqstate_t *state = *(curctx); \ |
|
/* MPS decoded. */ \ |
|
(bit) = state->mps; \ |
|
*(curctx) = state->nmps; \ |
|
} \ |
|
} |
|
|
|
#define jpc_mqdec_lpsexchange(areg, delta, curctx, bit) \ |
|
{ \ |
|
if ((areg) >= (delta)) { \ |
|
register jpc_mqstate_t *state = *(curctx); \ |
|
(areg) = (delta); \ |
|
(bit) = state->mps ^ 1; \ |
|
*(curctx) = state->nlps; \ |
|
} else { \ |
|
register jpc_mqstate_t *state = *(curctx); \ |
|
(areg) = (delta); \ |
|
(bit) = state->mps; \ |
|
*(curctx) = state->nmps; \ |
|
} \ |
|
} |
|
|
|
#define jpc_mqdec_renormd(areg, creg, ctreg, in, eof, inbuf) \ |
|
{ \ |
|
do { \ |
|
if (!(ctreg)) { \ |
|
jpc_mqdec_bytein2(creg, ctreg, in, eof, inbuf); \ |
|
} \ |
|
(areg) <<= 1; \ |
|
(creg) <<= 1; \ |
|
--(ctreg); \ |
|
} while (!((areg) & 0x8000)); \ |
|
} |
|
|
|
#define jpc_mqdec_bytein2(creg, ctreg, in, eof, inbuf) \ |
|
{ \ |
|
int c; \ |
|
unsigned char prevbuf; \ |
|
if (!(eof)) { \ |
|
if ((c = jas_stream_getc(in)) == EOF) { \ |
|
(eof) = 1; \ |
|
c = 0xff; \ |
|
} \ |
|
prevbuf = (inbuf); \ |
|
(inbuf) = c; \ |
|
if (prevbuf == 0xff) { \ |
|
if (c > 0x8f) { \ |
|
(creg) += 0xff00; \ |
|
(ctreg) = 8; \ |
|
} else { \ |
|
(creg) += c << 9; \ |
|
(ctreg) = 7; \ |
|
} \ |
|
} else { \ |
|
(creg) += c << 8; \ |
|
(ctreg) = 8; \ |
|
} \ |
|
} else { \ |
|
(creg) += 0xff00; \ |
|
(ctreg) = 8; \ |
|
} \ |
|
} |
|
|
|
int jpc_mqdec_getbit_func(jpc_mqdec_t *dec); |
|
int jpc_mqdec_mpsexchrenormd(jpc_mqdec_t *dec); |
|
int jpc_mqdec_lpsexchrenormd(jpc_mqdec_t *dec); |
|
|
|
#endif
|
|
|