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/*
* coeff.h
*
* Written by: Ullrich Hafner
*
* This file is part of FIASCO (Fractal Image And Sequence COdec)
* Copyright (C) 1994-2000 Ullrich Hafner
*/
/*
* $Date: 2000/06/14 20:50:51 $
* $Author: hafner $
* $Revision: 5.1 $
* $State: Exp $
*/
#ifndef _COEFF_H
#define _COEFF_H
#include "types.h"
#include "rpf.h"
#include "wfa.h"
typedef struct coeff
{
rpf_t *rpf; /* reduced precision format */
rpf_t *dc_rpf; /* RPF of DC (state 0) component */
unsigned min_level, max_level; /* allocate memory for [min,..,max] */
void *model; /* generic pointer to prob. model */
real_t (*bits) (const real_t *used_coeff, const word_t *used_domains,
unsigned level, const struct coeff *coeff);
/*
* Compute bit-rate of a range approximation with coefficients given by
* -1 terminated list 'used_domains'.
*/
void (*update) (const real_t *used_coeff, const word_t *used_domains,
unsigned level, struct coeff *coeff);
/*
* Update the probability model according to the chosen approximation.
* (given by the -1 terminated list 'used_domains').
*/
void (*free) (struct coeff *coeff);
/*
* Discard the given coefficients struct.
*/
void (*model_free) (void *model);
/*
* Free given probability model.
*/
void *(*model_duplicate) (const struct coeff *coeff, const void *model);
/*
* Duplicate the given probability model (i.e. alloc and copy).
*/
} coeff_t;
coeff_t *
alloc_coeff_model (const char *coeff_model_name, rpf_t *rpf, rpf_t *dc_rpf,
unsigned min_level, unsigned max_level);
#endif /* not _COEFF_H */
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