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jpc_mqenc.h
1/*
2 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
3 * British Columbia.
4 * Copyright (c) 2001-2002 Michael David Adams.
5 * All rights reserved.
6 */
7
8/* __START_OF_JASPER_LICENSE__
9 *
10 * JasPer License Version 2.0
11 *
12 * Copyright (c) 2001-2006 Michael David Adams
13 * Copyright (c) 1999-2000 Image Power, Inc.
14 * Copyright (c) 1999-2000 The University of British Columbia
15 *
16 * All rights reserved.
17 *
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:
25 *
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.
29 *
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
32 * written permission.
33 *
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.
60 *
61 * __END_OF_JASPER_LICENSE__
62 */
63
64/*
65 * MQ Arithmetic Encoder
66 *
67 * $Id$
68 */
69
70#ifndef JPC_MQENC_H
71#define JPC_MQENC_H
72
73/******************************************************************************\
74* Includes.
75\******************************************************************************/
76
77#include "jasper/jas_types.h"
78#include "jasper/jas_stream.h"
79
80#include "jpc_mqcod.h"
81
82#include <stdio.h>
83
84/******************************************************************************\
85* Constants.
86\******************************************************************************/
87
88/*
89 * Termination modes.
90 */
91
92#define JPC_MQENC_DEFTERM 0 /* default termination */
93#define JPC_MQENC_PTERM 1 /* predictable termination */
94
95/******************************************************************************\
96* Types.
97\******************************************************************************/
98
99/* MQ arithmetic encoder class. */
100
101 typedef struct {
102
103 /* The C register. */
104 uint_least32_t creg;
105
106 /* The A register. */
107 uint_least32_t areg;
108
109 /* The CT register. */
110 uint_least32_t ctreg;
111
112 /* The maximum number of contexts. */
113 unsigned maxctxs;
114
115 /* The per-context information. */
116 const jpc_mqstate_t **ctxs;
117
118 /* The current context. */
119 const jpc_mqstate_t **curctx;
120
121 /* The stream for encoder output. */
122 jas_stream_t *out;
123
124 /* The byte buffer (i.e., the B variable in the standard). */
125 int_least16_t outbuf;
126
127 /* The last byte output. */
128 int_least16_t lastbyte;
129
130 /* The error indicator. */
131 bool err;
132
133} jpc_mqenc_t;
134
135/* MQ arithmetic encoder state information. */
136
137 typedef struct {
138
139 /* The A register. */
140 unsigned areg;
141
142 /* The C register. */
143 unsigned creg;
144
145 /* The CT register. */
146 unsigned ctreg;
147
148 /* The last byte output by the encoder. */
149 int lastbyte;
150
151} jpc_mqencstate_t;
152
153/******************************************************************************\
154* Functions/macros for construction and destruction.
155\******************************************************************************/
156
157/* Create a MQ encoder. */
158jpc_mqenc_t *jpc_mqenc_create(unsigned maxctxs, jas_stream_t *out);
159
160/* Destroy a MQ encoder. */
161 void jpc_mqenc_destroy(jpc_mqenc_t *enc);
162
163/******************************************************************************\
164* Functions/macros for initialization.
165\******************************************************************************/
166
167/* Initialize a MQ encoder. */
168 void jpc_mqenc_init(jpc_mqenc_t *enc);
169
170/******************************************************************************\
171* Functions/macros for context manipulation.
172\******************************************************************************/
173
174/* Set the current context. */
175 static inline void jpc_mqenc_setcurctx(jpc_mqenc_t *enc, unsigned ctxno) {
176 enc->curctx = &enc->ctxs[ctxno];
177}
178
179/* Set the state information for multiple contexts. */
180 void jpc_mqenc_setctxs(jpc_mqenc_t *enc, unsigned numctxs, const jpc_mqctx_t *ctxs);
181
182/******************************************************************************\
183* Miscellaneous functions/macros.
184\******************************************************************************/
185
186/* Get the error state of a MQ encoder. */
187 static inline bool jpc_mqenc_error(const jpc_mqenc_t *enc) {
188 return enc->err;
189}
190
191/* Get the current encoder state. */
192 void jpc_mqenc_getstate(const jpc_mqenc_t *enc, jpc_mqencstate_t *state);
193
194/* Terminate the code. */
195 int jpc_mqenc_flush(jpc_mqenc_t *enc, int termmode);
196
197/******************************************************************************\
198* Functions/macros for encoding bits.
199\******************************************************************************/
200
201/******************************************************************************\
202* Functions/macros for debugging.
203\******************************************************************************/
204
205 int jpc_mqenc_dump(const jpc_mqenc_t *mqenc);
206
207/******************************************************************************\
208* Implementation-specific details.
209\******************************************************************************/
210
211/* Note: These function prototypes are included only to satisfy the
212 needs of the mqenc_putbit_macro macro. Do not call any of these
213 functions directly. */
214 int jpc_mqenc_codemps2(jpc_mqenc_t *enc);
215 int jpc_mqenc_codelps(jpc_mqenc_t *enc);
216
217 int jpc_mqenc_putbit(jpc_mqenc_t *enc, bool bit);
218
219#endif
jas_stream.h
I/O Stream Class.
jas_types.h
Primitive Types.
jas_stream_t
I/O stream object.
Definition: jas_stream.h:213