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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 | ||
34 | enum DWTType { | |
35 | FF_DWT97, | |
36 | FF_DWT53, | |
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37 | FF_DWT97_INT, |
38 | FF_DWT_NB | |
2ba45a60 DM |
39 | }; |
40 | ||
41 | typedef struct DWTContext { | |
42 | /// line lengths { horizontal, vertical } in consecutive decomposition levels | |
43 | uint16_t linelen[FF_DWT_MAX_DECLVLS][2]; | |
44 | uint8_t mod[FF_DWT_MAX_DECLVLS][2]; ///< coordinates (x0, y0) of decomp. levels mod 2 | |
45 | uint8_t ndeclevels; ///< number of decomposition levels | |
46 | uint8_t type; ///< 0 for 9/7; 1 for 5/3 | |
47 | int32_t *i_linebuf; ///< int buffer used by transform | |
48 | float *f_linebuf; ///< float buffer used by transform | |
49 | } DWTContext; | |
50 | ||
51 | /** | |
52 | * Initialize DWT. | |
53 | * @param s DWT context | |
54 | * @param border coordinates of transformed region {{x0, x1}, {y0, y1}} | |
55 | * @param decomp_levels number of decomposition levels | |
56 | * @param type 0 for DWT 9/7; 1 for DWT 5/3 | |
57 | */ | |
58 | int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2], | |
59 | int decomp_levels, int type); | |
60 | ||
61 | int ff_dwt_encode(DWTContext *s, void *t); | |
62 | int ff_dwt_decode(DWTContext *s, void *t); | |
63 | ||
64 | void ff_dwt_destroy(DWTContext *s); | |
65 | ||
66 | #endif /* AVCODEC_JPEG2000DWT_H */ |