mqc_inl.h
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/*
* The copyright in this software is being made available under the 2-clauses
* BSD License, included below. This software may be subject to other third
* party and contributor rights, including patent rights, and no such rights
* are granted under this license.
*
* Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium
* Copyright (c) 2002-2014, Professor Benoit Macq
* Copyright (c) 2001-2003, David Janssens
* Copyright (c) 2002-2003, Yannick Verschueren
* Copyright (c) 2003-2007, Francois-Olivier Devaux
* Copyright (c) 2003-2014, Antonin Descampe
* Copyright (c) 2005, Herve Drolon, FreeImage Team
* Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef OPJ_MQC_INL_H
#define OPJ_MQC_INL_H
/* For internal use of opj_mqc_decode_macro() */
#define opj_mqc_mpsexchange_macro(d, curctx, a) \
{ \
if (a < (*curctx)->qeval) { \
d = !((*curctx)->mps); \
*curctx = (*curctx)->nlps; \
} else { \
d = (*curctx)->mps; \
*curctx = (*curctx)->nmps; \
} \
}
/* For internal use of opj_mqc_decode_macro() */
#define opj_mqc_lpsexchange_macro(d, curctx, a) \
{ \
if (a < (*curctx)->qeval) { \
a = (*curctx)->qeval; \
d = (*curctx)->mps; \
*curctx = (*curctx)->nmps; \
} else { \
a = (*curctx)->qeval; \
d = !((*curctx)->mps); \
*curctx = (*curctx)->nlps; \
} \
}
static INLINE OPJ_UINT32 opj_mqc_raw_decode(opj_mqc_t *mqc)
{
OPJ_UINT32 d;
if (mqc->ct == 0) {
/* Given opj_mqc_raw_init_dec() we know that at some point we will */
/* have a 0xFF 0xFF artificial marker */
if (mqc->c == 0xff) {
if (*mqc->bp > 0x8f) {
mqc->c = 0xff;
mqc->ct = 8;
} else {
mqc->c = *mqc->bp;
mqc->bp ++;
mqc->ct = 7;
}
} else {
mqc->c = *mqc->bp;
mqc->bp ++;
mqc->ct = 8;
}
}
mqc->ct--;
d = ((OPJ_UINT32)mqc->c >> mqc->ct) & 0x01U;
return d;
}
#define opj_mqc_bytein_macro(mqc, c, ct) \
{ \
OPJ_UINT32 l_c; \
/* Given opj_mqc_init_dec() we know that at some point we will */ \
/* have a 0xFF 0xFF artificial marker */ \
l_c = *(mqc->bp + 1); \
if (*mqc->bp == 0xff) { \
if (l_c > 0x8f) { \
c += 0xff00; \
ct = 8; \
mqc->end_of_byte_stream_counter ++; \
} else { \
mqc->bp++; \
c += l_c << 9; \
ct = 7; \
} \
} else { \
mqc->bp++; \
c += l_c << 8; \
ct = 8; \
} \
}
/* For internal use of opj_mqc_decode_macro() */
#define opj_mqc_renormd_macro(mqc, a, c, ct) \
{ \
do { \
if (ct == 0) { \
opj_mqc_bytein_macro(mqc, c, ct); \
} \
a <<= 1; \
c <<= 1; \
ct--; \
} while (a < 0x8000); \
}
#define opj_mqc_decode_macro(d, mqc, curctx, a, c, ct) \
{ \
/* Implements ISO 15444-1 C.3.2 Decoding a decision (DECODE) */ \
/* Note: alternate "J.2 - Decoding an MPS or an LPS in the */ \
/* software-conventions decoder" has been tried, but does not bring any */ \
/* improvement. See https://github.com/uclouvain/openjpeg/issues/921 */ \
a -= (*curctx)->qeval; \
if ((c >> 16) < (*curctx)->qeval) { \
opj_mqc_lpsexchange_macro(d, curctx, a); \
opj_mqc_renormd_macro(mqc, a, c, ct); \
} else { \
c -= (*curctx)->qeval << 16; \
if ((a & 0x8000) == 0) { \
opj_mqc_mpsexchange_macro(d, curctx, a); \
opj_mqc_renormd_macro(mqc, a, c, ct); \
} else { \
d = (*curctx)->mps; \
} \
} \
}
#define DOWNLOAD_MQC_VARIABLES(mqc, curctx, a, c, ct) \
register const opj_mqc_state_t **curctx = mqc->curctx; \
register OPJ_UINT32 c = mqc->c; \
register OPJ_UINT32 a = mqc->a; \
register OPJ_UINT32 ct = mqc->ct
#define UPLOAD_MQC_VARIABLES(mqc, curctx, a, c, ct) \
mqc->curctx = curctx; \
mqc->c = c; \
mqc->a = a; \
mqc->ct = ct;
static INLINE void opj_mqc_bytein(opj_mqc_t *const mqc)
{
opj_mqc_bytein_macro(mqc, mqc->c, mqc->ct);
}
#define opj_mqc_renormd(mqc) \
opj_mqc_renormd_macro(mqc, mqc->a, mqc->c, mqc->ct)
#define opj_mqc_decode(d, mqc) \
opj_mqc_decode_macro(d, mqc, mqc->curctx, mqc->a, mqc->c, mqc->ct)
void opj_mqc_byteout(opj_mqc_t *mqc);
#define opj_mqc_renorme_macro(mqc, a_, c_, ct_) \
{ \
do { \
a_ <<= 1; \
c_ <<= 1; \
ct_--; \
if (ct_ == 0) { \
mqc->c = c_; \
opj_mqc_byteout(mqc); \
c_ = mqc->c; \
ct_ = mqc->ct; \
} \
} while( (a_ & 0x8000) == 0); \
}
#define opj_mqc_codemps_macro(mqc, curctx, a, c, ct) \
{ \
a -= (*curctx)->qeval; \
if ((a & 0x8000) == 0) { \
if (a < (*curctx)->qeval) { \
a = (*curctx)->qeval; \
} else { \
c += (*curctx)->qeval; \
} \
*curctx = (*curctx)->nmps; \
opj_mqc_renorme_macro(mqc, a, c, ct); \
} else { \
c += (*curctx)->qeval; \
} \
}
#define opj_mqc_codelps_macro(mqc, curctx, a, c, ct) \
{ \
a -= (*curctx)->qeval; \
if (a < (*curctx)->qeval) { \
c += (*curctx)->qeval; \
} else { \
a = (*curctx)->qeval; \
} \
*curctx = (*curctx)->nlps; \
opj_mqc_renorme_macro(mqc, a, c, ct); \
}
#define opj_mqc_encode_macro(mqc, curctx, a, c, ct, d) \
{ \
if ((*curctx)->mps == (d)) { \
opj_mqc_codemps_macro(mqc, curctx, a, c, ct); \
} else { \
opj_mqc_codelps_macro(mqc, curctx, a, c, ct); \
} \
}
#define opj_mqc_bypass_enc_macro(mqc, c, ct, d) \
{\
if (ct == BYPASS_CT_INIT) {\
ct = 8;\
}\
ct--;\
c = c + ((d) << ct);\
if (ct == 0) {\
*mqc->bp = (OPJ_BYTE)c;\
ct = 8;\
/* If the previous byte was 0xff, make sure that the next msb is 0 */ \
if (*mqc->bp == 0xff) {\
ct = 7;\
}\
mqc->bp++;\
c = 0;\
}\
}
#endif /* OPJ_MQC_INL_H */
opj_mqc_byteout
void opj_mqc_byteout(opj_mqc_t *mqc)
Output a byte, doing bit-stuffing if necessary.
Definition mqc.c:492
opj_mqc_raw_decode
static INLINE OPJ_UINT32 opj_mqc_raw_decode(opj_mqc_t *mqc)
Decode a symbol using raw-decoder.
Definition mqc_inl.h:74
opj_mqc_bytein_macro
#define opj_mqc_bytein_macro(mqc, c, ct)
Definition mqc_inl.h:102
opj_mqc_bytein
static INLINE void opj_mqc_bytein(opj_mqc_t *const mqc)
Input a byte.
Definition mqc_inl.h:175
INLINE
#define INLINE
Definition openjpeg.h:65
OPJ_UINT32
uint32_t OPJ_UINT32
Definition openjpeg.h:132
opj_mqc
MQ coder.
Definition mqc.h:74
opj_mqc::bp
OPJ_BYTE * bp
pointer to the current position in the buffer
Definition mqc.h:84
opj_mqc::c
OPJ_UINT32 c
temporary buffer where bits are coded or decoded
Definition mqc.h:76
opj_mqc::ct
OPJ_UINT32 ct
number of bits already read or free to write
Definition mqc.h:80