2 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
4 * Copyright (c) 2001-2002 Michael David Adams.
8 /* __START_OF_JASPER_LICENSE__
10 * JasPer License Version 2.0
12 * Copyright (c) 1999-2000 Image Power, Inc.
13 * Copyright (c) 1999-2000 The University of British Columbia
14 * Copyright (c) 2001-2003 Michael David Adams
16 * All rights reserved.
18 * Permission is hereby granted, free of charge, to any person (the
19 * "User") obtaining a copy of this software and associated documentation
20 * files (the "Software"), to deal in the Software without restriction,
21 * including without limitation the rights to use, copy, modify, merge,
22 * publish, distribute, and/or sell copies of the Software, and to permit
23 * persons to whom the Software is furnished to do so, subject to the
24 * following conditions:
26 * 1. The above copyright notices and this permission notice (which
27 * includes the disclaimer below) shall be included in all copies or
28 * substantial portions of the Software.
30 * 2. The name of a copyright holder shall not be used to endorse or
31 * promote products derived from the Software without specific prior
34 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
35 * LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
36 * THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
37 * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
38 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
39 * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
40 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
41 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
42 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
43 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
44 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
45 * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
46 * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
47 * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
48 * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
49 * PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
50 * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
51 * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
52 * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
53 * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
54 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
55 * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
56 * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
57 * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
58 * RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
59 * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
61 * __END_OF_JASPER_LICENSE__
65 * MQ Arithmetic Encoder
67 * $Id: jpc_mqenc.h,v 1.1 2005/05/22 18:33:05 malaterre Exp $
73 /******************************************************************************\
75 \******************************************************************************/
77 #include "jasper/jas_types.h"
78 #include "jasper/jas_stream.h"
80 #include "jpc_mqcod.h"
82 /******************************************************************************\
84 \******************************************************************************/
90 #define JPC_MQENC_DEFTERM 0 /* default termination */
91 #define JPC_MQENC_PTERM 1 /* predictable termination */
93 /******************************************************************************\
95 \******************************************************************************/
97 /* MQ arithmetic encoder class. */
101 /* The C register. */
104 /* The A register. */
107 /* The CT register. */
110 /* The maximum number of contexts. */
113 /* The per-context information. */
114 jpc_mqstate_t **ctxs;
116 /* The current context. */
117 jpc_mqstate_t **curctx;
119 /* The stream for encoder output. */
122 /* The byte buffer (i.e., the B variable in the standard). */
125 /* The last byte output. */
126 int_fast16_t lastbyte;
128 /* The error indicator. */
133 /* MQ arithmetic encoder state information. */
137 /* The A register. */
140 /* The C register. */
143 /* The CT register. */
146 /* The last byte output by the encoder. */
151 /******************************************************************************\
152 * Functions/macros for construction and destruction.
153 \******************************************************************************/
155 /* Create a MQ encoder. */
156 jpc_mqenc_t *jpc_mqenc_create(int maxctxs, jas_stream_t *out);
158 /* Destroy a MQ encoder. */
159 void jpc_mqenc_destroy(jpc_mqenc_t *enc);
161 /******************************************************************************\
162 * Functions/macros for initialization.
163 \******************************************************************************/
165 /* Initialize a MQ encoder. */
166 void jpc_mqenc_init(jpc_mqenc_t *enc);
168 /******************************************************************************\
169 * Functions/macros for context manipulation.
170 \******************************************************************************/
172 /* Set the current context. */
173 #define jpc_mqenc_setcurctx(enc, ctxno) \
174 ((enc)->curctx = &(enc)->ctxs[ctxno]);
176 /* Set the state information for a particular context. */
177 void jpc_mqenc_setctx(jpc_mqenc_t *enc, int ctxno, jpc_mqctx_t *ctx);
179 /* Set the state information for multiple contexts. */
180 void jpc_mqenc_setctxs(jpc_mqenc_t *enc, int numctxs, jpc_mqctx_t *ctxs);
182 /******************************************************************************\
183 * Miscellaneous functions/macros.
184 \******************************************************************************/
186 /* Get the error state of a MQ encoder. */
187 #define jpc_mqenc_error(enc) \
190 /* Get the current encoder state. */
191 void jpc_mqenc_getstate(jpc_mqenc_t *enc, jpc_mqencstate_t *state);
193 /* Terminate the code. */
194 int jpc_mqenc_flush(jpc_mqenc_t *enc, int termmode);
196 /******************************************************************************\
197 * Functions/macros for encoding bits.
198 \******************************************************************************/
202 #define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_macro(enc, bit)
204 #define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_func(enc, bit)
207 /******************************************************************************\
208 * Functions/macros for debugging.
209 \******************************************************************************/
211 int jpc_mqenc_dump(jpc_mqenc_t *mqenc, FILE *out);
213 /******************************************************************************\
214 * Implementation-specific details.
215 \******************************************************************************/
217 /* Note: This macro is included only to satisfy the needs of
218 the mqenc_putbit macro. */
219 #define jpc_mqenc_putbit_macro(enc, bit) \
220 (((*((enc)->curctx))->mps == (bit)) ? \
221 (((enc)->areg -= (*(enc)->curctx)->qeval), \
222 ((!((enc)->areg & 0x8000)) ? (jpc_mqenc_codemps2(enc)) : \
223 ((enc)->creg += (*(enc)->curctx)->qeval))) : \
224 jpc_mqenc_codelps(enc))
226 /* Note: These function prototypes are included only to satisfy the
227 needs of the mqenc_putbit_macro macro. Do not call any of these
228 functions directly. */
229 int jpc_mqenc_codemps2(jpc_mqenc_t *enc);
230 int jpc_mqenc_codelps(jpc_mqenc_t *enc);
232 /* Note: This function prototype is included only to satisfy the needs of
233 the mqenc_putbit macro. */
234 int jpc_mqenc_putbit_func(jpc_mqenc_t *enc, int bit);