mirror of
https://github.com/opencv/opencv.git
synced 2024-12-30 04:58:54 +08:00
272 lines
9.0 KiB
C
272 lines
9.0 KiB
C
/*
|
|
* 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
|