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
26 * Discrete wavelet transform
28 * @author Kamil Nowosad
33 #define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
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 void *linebuf; ///< buffer used by transform (int or float)
51 * @param s DWT context
52 * @param border coordinates of transformed region {{x0, x1}, {y0, y1}}
53 * @param decomp_levels number of decomposition levels
54 * @param type 0 for DWT 9/7; 1 for DWT 5/3
56 int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type);
58 int ff_j2k_dwt_encode(DWTContext *s, int *t);
59 int ff_j2k_dwt_decode(DWTContext *s, int *t);
61 void ff_j2k_dwt_destroy(DWTContext *s);
63 #endif /* AVCODEC_DWT_H */