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| /* |
| * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium |
| * Copyright (c) 2002-2007, Professor Benoit Macq |
| * Copyright (c) 2001-2003, David Janssens |
| * Copyright (c) 2002-2003, Yannick Verschueren |
| * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe |
| * Copyright (c) 2005, Herve Drolon, FreeImage Team |
| * 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 __MQC_H |
| #define __MQC_H |
| /** |
| @file mqc.h |
| @brief Implementation of an MQ-Coder (MQC) |
| |
| The functions in MQC.C have for goal to realize the MQ-coder operations. The functions |
| in MQC.C are used by some function in T1.C. |
| */ |
| |
| /** @defgroup MQC MQC - Implementation of an MQ-Coder */ |
| /*@{*/ |
| |
| /** |
| This struct defines the state of a context. |
| */ |
| typedef struct opj_mqc_state { |
| /** the probability of the Least Probable Symbol (0.75->0x8000, 1.5->0xffff) */ |
| unsigned int qeval; |
| /** the Most Probable Symbol (0 or 1) */ |
| int mps; |
| /** next state if the next encoded symbol is the MPS */ |
| struct opj_mqc_state *nmps; |
| /** next state if the next encoded symbol is the LPS */ |
| struct opj_mqc_state *nlps; |
| } opj_mqc_state_t; |
| |
| #define MQC_NUMCTXS 19 |
| |
| /** |
| MQ coder |
| */ |
| typedef struct opj_mqc { |
| unsigned int c; |
| unsigned int a; |
| unsigned int ct; |
| unsigned char *bp; |
| unsigned char *start; |
| unsigned char *end; |
| opj_mqc_state_t *ctxs[MQC_NUMCTXS]; |
| opj_mqc_state_t **curctx; |
| #ifdef MQC_PERF_OPT |
| unsigned char *buffer; |
| #endif |
| } opj_mqc_t; |
| |
| /** @name Exported functions */ |
| /*@{*/ |
| /* ----------------------------------------------------------------------- */ |
| /** |
| Create a new MQC handle |
| @return Returns a new MQC handle if successful, returns NULL otherwise |
| */ |
| opj_mqc_t* mqc_create(void); |
| /** |
| Destroy a previously created MQC handle |
| @param mqc MQC handle to destroy |
| */ |
| void mqc_destroy(opj_mqc_t *mqc); |
| /** |
| Return the number of bytes written/read since initialisation |
| @param mqc MQC handle |
| @return Returns the number of bytes already encoded |
| */ |
| int mqc_numbytes(opj_mqc_t *mqc); |
| /** |
| Reset the states of all the context of the coder/decoder |
| (each context is set to a state where 0 and 1 are more or less equiprobable) |
| @param mqc MQC handle |
| */ |
| void mqc_resetstates(opj_mqc_t *mqc); |
| /** |
| Set the state of a particular context |
| @param mqc MQC handle |
| @param ctxno Number that identifies the context |
| @param msb The MSB of the new state of the context |
| @param prob Number that identifies the probability of the symbols for the new state of the context |
| */ |
| void mqc_setstate(opj_mqc_t *mqc, int ctxno, int msb, int prob); |
| /** |
| Initialize the encoder |
| @param mqc MQC handle |
| @param bp Pointer to the start of the buffer where the bytes will be written |
| */ |
| void mqc_init_enc(opj_mqc_t *mqc, unsigned char *bp); |
| /** |
| Set the current context used for coding/decoding |
| @param mqc MQC handle |
| @param ctxno Number that identifies the context |
| */ |
| #define mqc_setcurctx(mqc, ctxno) (mqc)->curctx = &(mqc)->ctxs[(int)(ctxno)] |
| /** |
| Encode a symbol using the MQ-coder |
| @param mqc MQC handle |
| @param d The symbol to be encoded (0 or 1) |
| */ |
| void mqc_encode(opj_mqc_t *mqc, int d); |
| /** |
| Flush the encoder, so that all remaining data is written |
| @param mqc MQC handle |
| */ |
| void mqc_flush(opj_mqc_t *mqc); |
| /** |
| BYPASS mode switch, initialization operation. |
| JPEG 2000 p 505. |
| <h2>Not fully implemented and tested !!</h2> |
| @param mqc MQC handle |
| */ |
| void mqc_bypass_init_enc(opj_mqc_t *mqc); |
| /** |
| BYPASS mode switch, coding operation. |
| JPEG 2000 p 505. |
| <h2>Not fully implemented and tested !!</h2> |
| @param mqc MQC handle |
| @param d The symbol to be encoded (0 or 1) |
| */ |
| void mqc_bypass_enc(opj_mqc_t *mqc, int d); |
| /** |
| BYPASS mode switch, flush operation |
| <h2>Not fully implemented and tested !!</h2> |
| @param mqc MQC handle |
| @return Returns 1 (always) |
| */ |
| int mqc_bypass_flush_enc(opj_mqc_t *mqc); |
| /** |
| RESET mode switch |
| @param mqc MQC handle |
| */ |
| void mqc_reset_enc(opj_mqc_t *mqc); |
| /** |
| RESTART mode switch (TERMALL) |
| @param mqc MQC handle |
| @return Returns 1 (always) |
| */ |
| int mqc_restart_enc(opj_mqc_t *mqc); |
| /** |
| RESTART mode switch (TERMALL) reinitialisation |
| @param mqc MQC handle |
| */ |
| void mqc_restart_init_enc(opj_mqc_t *mqc); |
| /** |
| ERTERM mode switch (PTERM) |
| @param mqc MQC handle |
| */ |
| void mqc_erterm_enc(opj_mqc_t *mqc); |
| /** |
| SEGMARK mode switch (SEGSYM) |
| @param mqc MQC handle |
| */ |
| void mqc_segmark_enc(opj_mqc_t *mqc); |
| /** |
| Initialize the decoder |
| @param mqc MQC handle |
| @param bp Pointer to the start of the buffer from which the bytes will be read |
| @param len Length of the input buffer |
| */ |
| void mqc_init_dec(opj_mqc_t *mqc, unsigned char *bp, int len); |
| /** |
| Decode a symbol |
| @param mqc MQC handle |
| @return Returns the decoded symbol (0 or 1) |
| */ |
| int mqc_decode(opj_mqc_t *const mqc); |
| /* ----------------------------------------------------------------------- */ |
| /*@}*/ |
| |
| /*@}*/ |
| |
| #endif /* __MQC_H */ |
| Property changes: |
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