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/*
* Copyright (c) 1999-2000 Image Power, Inc. and the University of
* British Columbia.
* Copyright (c) 2001-2002 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 Encoder
*
* $Id$
*/
#ifndef JPC_MQENC_H
#define JPC_MQENC_H
/******************************************************************************\
* Includes.
\******************************************************************************/
#include "jasper/jas_types.h"
#include "jasper/jas_stream.h"
#include "jpc_mqcod.h"
/******************************************************************************\
* Constants.
\******************************************************************************/
/*
* Termination modes.
*/
#define JPC_MQENC_DEFTERM 0 /* default termination */
#define JPC_MQENC_PTERM 1 /* predictable termination */
/******************************************************************************\
* Types.
\******************************************************************************/
/* MQ arithmetic encoder class. */
typedef struct {
/* The C register. */
uint_fast32_t creg;
/* The A register. */
uint_fast32_t areg;
/* The CT register. */
uint_fast32_t ctreg;
/* The maximum number of contexts. */
int maxctxs;
/* The per-context information. */
jpc_mqstate_t **ctxs;
/* The current context. */
jpc_mqstate_t **curctx;
/* The stream for encoder output. */
jas_stream_t *out;
/* The byte buffer (i.e., the B variable in the standard). */
int_fast16_t outbuf;
/* The last byte output. */
int_fast16_t lastbyte;
/* The error indicator. */
int err;
} jpc_mqenc_t;
/* MQ arithmetic encoder state information. */
typedef struct {
/* The A register. */
unsigned areg;
/* The C register. */
unsigned creg;
/* The CT register. */
unsigned ctreg;
/* The last byte output by the encoder. */
int lastbyte;
} jpc_mqencstate_t;
/******************************************************************************\
* Functions/macros for construction and destruction.
\******************************************************************************/
/* Create a MQ encoder. */
jpc_mqenc_t *jpc_mqenc_create(int maxctxs, jas_stream_t *out);
/* Destroy a MQ encoder. */
void jpc_mqenc_destroy(jpc_mqenc_t *enc);
/******************************************************************************\
* Functions/macros for initialization.
\******************************************************************************/
/* Initialize a MQ encoder. */
void jpc_mqenc_init(jpc_mqenc_t *enc);
/******************************************************************************\
* Functions/macros for context manipulation.
\******************************************************************************/
/* Set the current context. */
#define jpc_mqenc_setcurctx(enc, ctxno) \
((enc)->curctx = &(enc)->ctxs[ctxno]);
/* Set the state information for a particular context. */
void jpc_mqenc_setctx(jpc_mqenc_t *enc, int ctxno, jpc_mqctx_t *ctx);
/* Set the state information for multiple contexts. */
void jpc_mqenc_setctxs(jpc_mqenc_t *enc, int numctxs, jpc_mqctx_t *ctxs);
/******************************************************************************\
* Miscellaneous functions/macros.
\******************************************************************************/
/* Get the error state of a MQ encoder. */
#define jpc_mqenc_error(enc) \
((enc)->err)
/* Get the current encoder state. */
void jpc_mqenc_getstate(jpc_mqenc_t *enc, jpc_mqencstate_t *state);
/* Terminate the code. */
int jpc_mqenc_flush(jpc_mqenc_t *enc, int termmode);
/******************************************************************************\
* Functions/macros for encoding bits.
\******************************************************************************/
/* Encode a bit. */
#if !defined(DEBUG)
#define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_macro(enc, bit)
#else
#define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_func(enc, bit)
#endif
/******************************************************************************\
* Functions/macros for debugging.
\******************************************************************************/
int jpc_mqenc_dump(jpc_mqenc_t *mqenc, FILE *out);
/******************************************************************************\
* Implementation-specific details.
\******************************************************************************/
/* Note: This macro is included only to satisfy the needs of
the mqenc_putbit macro. */
#define jpc_mqenc_putbit_macro(enc, bit) \
(((*((enc)->curctx))->mps == (bit)) ? \
(((enc)->areg -= (*(enc)->curctx)->qeval), \
((!((enc)->areg & 0x8000)) ? (jpc_mqenc_codemps2(enc)) : \
((enc)->creg += (*(enc)->curctx)->qeval))) : \
jpc_mqenc_codelps(enc))
/* Note: These function prototypes are included only to satisfy the
needs of the mqenc_putbit_macro macro. Do not call any of these
functions directly. */
int jpc_mqenc_codemps2(jpc_mqenc_t *enc);
int jpc_mqenc_codelps(jpc_mqenc_t *enc);
/* Note: This function prototype is included only to satisfy the needs of
the mqenc_putbit macro. */
int jpc_mqenc_putbit_func(jpc_mqenc_t *enc, int bit);
#endif
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