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 #define F_LFTG_K 1.230174104914001f
34 #define F_LFTG_X 0.812893066115961f
35
41 };
42
44 /// line lengths { horizontal, vertical } in consecutive decomposition levels
50 float *
f_linebuf;
///< float buffer used by transform
52
53 /**
54 * Initialize DWT.
55 * @param s DWT context
56 * @param border coordinates of transformed region {{x0, x1}, {y0, y1}}
57 * @param decomp_levels number of decomposition levels
58 * @param type 0 for DWT 9/7; 1 for DWT 5/3
59 */
61 int decomp_levels,
int type);
62
65
67
68 #endif /* AVCODEC_JPEG2000DWT_H */
uint8_t ndeclevels
number of decomposition levels
uint8_t type
0 for 9/7; 1 for 5/3
int32_t * i_linebuf
int buffer used by transform
int linelen[FF_DWT_MAX_DECLVLS][2]
line lengths { horizontal, vertical } in consecutive decomposition levels
void ff_dwt_destroy(DWTContext *s)
#define FF_DWT_MAX_DECLVLS
max number of decomposition levels
int ff_dwt_encode(DWTContext *s, void *t)
float * f_linebuf
float buffer used by transform
int ff_dwt_decode(DWTContext *s, void *t)
int ff_jpeg2000_dwt_init(DWTContext *s, int border[2][2], int decomp_levels, int type)
Initialize DWT.
uint8_t mod[FF_DWT_MAX_DECLVLS][2]
coordinates (x0, y0) of decomp. levels mod 2