1/*
2 * Discrete wavelet transform
3 * Copyright (c) 2007 Kamil Nowosad
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef AVCODEC_JPEG2000DWT_H
23#define AVCODEC_JPEG2000DWT_H
24
25/**
26 * @file
27 * Discrete wavelet transform
28 */
29
30#include <stdint.h>
31
32#define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
33
34enum DWTType {
35    FF_DWT97,
36    FF_DWT53,
37    FF_DWT97_INT
38};
39
40typedef struct DWTContext {
41    /// line lengths { horizontal, vertical } in consecutive decomposition levels
42    uint16_t linelen[FF_DWT_MAX_DECLVLS][2];
43    uint8_t mod[FF_DWT_MAX_DECLVLS][2];  ///< coordinates (x0, y0) of decomp. levels mod 2
44    uint8_t ndeclevels;                  ///< number of decomposition levels
45    uint8_t type;                        ///< 0 for 9/7; 1 for 5/3
46    int32_t *i_linebuf;                  ///< int buffer used by transform
47    float   *f_linebuf;                  ///< float buffer used by transform
48} DWTContext;
49
50/**
51 * Initialize DWT.
52 * @param s                 DWT context
53 * @param border            coordinates of transformed region {{x0, x1}, {y0, y1}}
54 * @param decomp_levels     number of decomposition levels
55 * @param type              0 for DWT 9/7; 1 for DWT 5/3
56 */
57int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2],
58                         int decomp_levels, int type);
59
60int ff_dwt_encode(DWTContext *s, void *t);
61int ff_dwt_decode(DWTContext *s, void *t);
62
63void ff_dwt_destroy(DWTContext *s);
64
65#endif /* AVCODEC_JPEG2000DWT_H */
66