2 * Discrete wavelet transform
3 * Copyright (c) 2007 Kamil Nowosad
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef AVCODEC_JPEG2000DWT_H
23 #define AVCODEC_JPEG2000DWT_H
27 * Discrete wavelet transform
32 #define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
40 typedef 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
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
57 int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2],
58 int decomp_levels, int type);
60 int ff_dwt_encode(DWTContext *s, void *t);
61 int ff_dwt_decode(DWTContext *s, void *t);
63 void ff_dwt_destroy(DWTContext *s);
65 #endif /* AVCODEC_JPEG2000DWT_H */