198 lines
5.8 KiB
C
198 lines
5.8 KiB
C
/*
|
|
* 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 32
|
|
|
|
/**
|
|
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;
|
|
} 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();
|
|
/**
|
|
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
|
|
*/
|
|
void mqc_setcurctx(opj_mqc_t *mqc, 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 *mqc);
|
|
/* ----------------------------------------------------------------------- */
|
|
/*@}*/
|
|
|
|
/*@}*/
|
|
|
|
#endif /* __MQC_H */
|