Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 8619 | maxcodehac | 1 | /* |
| 2 | * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
||
| 3 | * Copyright (c) 2002-2007, Professor Benoit Macq |
||
| 4 | * Copyright (c) 2001-2003, David Janssens |
||
| 5 | * Copyright (c) 2002-2003, Yannick Verschueren |
||
| 6 | * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
||
| 7 | * Copyright (c) 2005, Herve Drolon, FreeImage Team |
||
| 8 | * All rights reserved. |
||
| 9 | * |
||
| 10 | * Redistribution and use in source and binary forms, with or without |
||
| 11 | * modification, are permitted provided that the following conditions |
||
| 12 | * are met: |
||
| 13 | * 1. Redistributions of source code must retain the above copyright |
||
| 14 | * notice, this list of conditions and the following disclaimer. |
||
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
||
| 16 | * notice, this list of conditions and the following disclaimer in the |
||
| 17 | * documentation and/or other materials provided with the distribution. |
||
| 18 | * |
||
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' |
||
| 20 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
||
| 21 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
||
| 22 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
||
| 23 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
||
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
||
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
||
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
||
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
||
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
||
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
||
| 30 | */ |
||
| 31 | |||
| 32 | #ifndef __MQC_H |
||
| 33 | #define __MQC_H |
||
| 34 | /** |
||
| 35 | @file mqc.h |
||
| 36 | @brief Implementation of an MQ-Coder (MQC) |
||
| 37 | |||
| 38 | The functions in MQC.C have for goal to realize the MQ-coder operations. The functions |
||
| 39 | in MQC.C are used by some function in T1.C. |
||
| 40 | */ |
||
| 41 | |||
| 42 | /** @defgroup MQC MQC - Implementation of an MQ-Coder */ |
||
| 43 | /*@{*/ |
||
| 44 | |||
| 45 | /** |
||
| 46 | This struct defines the state of a context. |
||
| 47 | */ |
||
| 48 | typedef struct opj_mqc_state { |
||
| 49 | /** the probability of the Least Probable Symbol (0.75->0x8000, 1.5->0xffff) */ |
||
| 50 | unsigned int qeval; |
||
| 51 | /** the Most Probable Symbol (0 or 1) */ |
||
| 52 | int mps; |
||
| 53 | /** next state if the next encoded symbol is the MPS */ |
||
| 54 | struct opj_mqc_state *nmps; |
||
| 55 | /** next state if the next encoded symbol is the LPS */ |
||
| 56 | struct opj_mqc_state *nlps; |
||
| 57 | } opj_mqc_state_t; |
||
| 58 | |||
| 59 | #define MQC_NUMCTXS 19 |
||
| 60 | |||
| 61 | /** |
||
| 62 | MQ coder |
||
| 63 | */ |
||
| 64 | typedef struct opj_mqc { |
||
| 65 | unsigned int c; |
||
| 66 | unsigned int a; |
||
| 67 | unsigned int ct; |
||
| 68 | unsigned char *bp; |
||
| 69 | unsigned char *start; |
||
| 70 | unsigned char *end; |
||
| 71 | opj_mqc_state_t *ctxs[MQC_NUMCTXS]; |
||
| 72 | opj_mqc_state_t **curctx; |
||
| 73 | #ifdef MQC_PERF_OPT |
||
| 74 | unsigned char *buffer; |
||
| 75 | #endif |
||
| 76 | } opj_mqc_t; |
||
| 77 | |||
| 78 | /** @name Exported functions */ |
||
| 79 | /*@{*/ |
||
| 80 | /* ----------------------------------------------------------------------- */ |
||
| 81 | /** |
||
| 82 | Create a new MQC handle |
||
| 83 | @return Returns a new MQC handle if successful, returns NULL otherwise |
||
| 84 | */ |
||
| 85 | opj_mqc_t* mqc_create(void); |
||
| 86 | /** |
||
| 87 | Destroy a previously created MQC handle |
||
| 88 | @param mqc MQC handle to destroy |
||
| 89 | */ |
||
| 90 | void mqc_destroy(opj_mqc_t *mqc); |
||
| 91 | /** |
||
| 92 | Return the number of bytes written/read since initialisation |
||
| 93 | @param mqc MQC handle |
||
| 94 | @return Returns the number of bytes already encoded |
||
| 95 | */ |
||
| 96 | int mqc_numbytes(opj_mqc_t *mqc); |
||
| 97 | /** |
||
| 98 | Reset the states of all the context of the coder/decoder |
||
| 99 | (each context is set to a state where 0 and 1 are more or less equiprobable) |
||
| 100 | @param mqc MQC handle |
||
| 101 | */ |
||
| 102 | void mqc_resetstates(opj_mqc_t *mqc); |
||
| 103 | /** |
||
| 104 | Set the state of a particular context |
||
| 105 | @param mqc MQC handle |
||
| 106 | @param ctxno Number that identifies the context |
||
| 107 | @param msb The MSB of the new state of the context |
||
| 108 | @param prob Number that identifies the probability of the symbols for the new state of the context |
||
| 109 | */ |
||
| 110 | void mqc_setstate(opj_mqc_t *mqc, int ctxno, int msb, int prob); |
||
| 111 | /** |
||
| 112 | Initialize the encoder |
||
| 113 | @param mqc MQC handle |
||
| 114 | @param bp Pointer to the start of the buffer where the bytes will be written |
||
| 115 | */ |
||
| 116 | void mqc_init_enc(opj_mqc_t *mqc, unsigned char *bp); |
||
| 117 | /** |
||
| 118 | Set the current context used for coding/decoding |
||
| 119 | @param mqc MQC handle |
||
| 120 | @param ctxno Number that identifies the context |
||
| 121 | */ |
||
| 122 | #define mqc_setcurctx(mqc, ctxno) (mqc)->curctx = &(mqc)->ctxs[(int)(ctxno)] |
||
| 123 | /** |
||
| 124 | Encode a symbol using the MQ-coder |
||
| 125 | @param mqc MQC handle |
||
| 126 | @param d The symbol to be encoded (0 or 1) |
||
| 127 | */ |
||
| 128 | void mqc_encode(opj_mqc_t *mqc, int d); |
||
| 129 | /** |
||
| 130 | Flush the encoder, so that all remaining data is written |
||
| 131 | @param mqc MQC handle |
||
| 132 | */ |
||
| 133 | void mqc_flush(opj_mqc_t *mqc); |
||
| 134 | /** |
||
| 135 | BYPASS mode switch, initialization operation. |
||
| 136 | JPEG 2000 p 505. |
||
| 137 |
|
||
| 138 | @param mqc MQC handle |
||
| 139 | */ |
||
| 140 | void mqc_bypass_init_enc(opj_mqc_t *mqc); |
||
| 141 | /** |
||
| 142 | BYPASS mode switch, coding operation. |
||
| 143 | JPEG 2000 p 505. |
||
| 144 |
|
||
| 145 | @param mqc MQC handle |
||
| 146 | @param d The symbol to be encoded (0 or 1) |
||
| 147 | */ |
||
| 148 | void mqc_bypass_enc(opj_mqc_t *mqc, int d); |
||
| 149 | /** |
||
| 150 | BYPASS mode switch, flush operation |
||
| 151 |
|
||
| 152 | @param mqc MQC handle |
||
| 153 | @return Returns 1 (always) |
||
| 154 | */ |
||
| 155 | int mqc_bypass_flush_enc(opj_mqc_t *mqc); |
||
| 156 | /** |
||
| 157 | RESET mode switch |
||
| 158 | @param mqc MQC handle |
||
| 159 | */ |
||
| 160 | void mqc_reset_enc(opj_mqc_t *mqc); |
||
| 161 | /** |
||
| 162 | RESTART mode switch (TERMALL) |
||
| 163 | @param mqc MQC handle |
||
| 164 | @return Returns 1 (always) |
||
| 165 | */ |
||
| 166 | int mqc_restart_enc(opj_mqc_t *mqc); |
||
| 167 | /** |
||
| 168 | RESTART mode switch (TERMALL) reinitialisation |
||
| 169 | @param mqc MQC handle |
||
| 170 | */ |
||
| 171 | void mqc_restart_init_enc(opj_mqc_t *mqc); |
||
| 172 | /** |
||
| 173 | ERTERM mode switch (PTERM) |
||
| 174 | @param mqc MQC handle |
||
| 175 | */ |
||
| 176 | void mqc_erterm_enc(opj_mqc_t *mqc); |
||
| 177 | /** |
||
| 178 | SEGMARK mode switch (SEGSYM) |
||
| 179 | @param mqc MQC handle |
||
| 180 | */ |
||
| 181 | void mqc_segmark_enc(opj_mqc_t *mqc); |
||
| 182 | /** |
||
| 183 | Initialize the decoder |
||
| 184 | @param mqc MQC handle |
||
| 185 | @param bp Pointer to the start of the buffer from which the bytes will be read |
||
| 186 | @param len Length of the input buffer |
||
| 187 | */ |
||
| 188 | void mqc_init_dec(opj_mqc_t *mqc, unsigned char *bp, int len); |
||
| 189 | /** |
||
| 190 | Decode a symbol |
||
| 191 | @param mqc MQC handle |
||
| 192 | @return Returns the decoded symbol (0 or 1) |
||
| 193 | */ |
||
| 194 | int mqc_decode(opj_mqc_t *const mqc); |
||
| 195 | /* ----------------------------------------------------------------------- */ |
||
| 196 | /*@}*/ |
||
| 197 | |||
| 198 | /*@}*/ |
||
| 199 | |||
| 200 | #endif /* __MQC_H */ |