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/*
* Discrete wavelet transform
* Copyright (c) 2007 Kamil Nowosad
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_DWT_H
#define AVCODEC_DWT_H
/**
* Discrete wavelet transform
* @file
* @author Kamil Nowosad
*/
#include "avcodec.h"
#define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
enum DWTType{
FF_DWT97,
FF_DWT53
};
typedef struct {
///line lengths {horizontal, vertical} in consecutive decomposition levels
uint16_t linelen[FF_DWT_MAX_DECLVLS][2];
uint8_t mod[FF_DWT_MAX_DECLVLS][2]; ///< coordinates (x0, y0) of decomp. levels mod 2
uint8_t ndeclevels; ///< number of decomposition levels
uint8_t type; ///< 0 for 9/7; 1 for 5/3
void *linebuf; ///< buffer used by transform (int or float)
} DWTContext;
/**
* initialize DWT
* @param s DWT context
* @param border coordinates of transformed region {{x0, x1}, {y0, y1}}
* @param decomp_levels number of decomposition levels
* @param type 0 for DWT 9/7; 1 for DWT 5/3
*/
int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type);
int ff_j2k_dwt_encode(DWTContext *s, int *t);
int ff_j2k_dwt_decode(DWTContext *s, int *t);
void ff_j2k_dwt_destroy(DWTContext *s);
#endif /* AVCODEC_DWT_H */
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