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/libavcodec/j2k_dwt.h

http://github.com/FFmpeg/FFmpeg
C++ Header | 63 lines | 20 code | 10 blank | 33 comment | 0 complexity | 1d9124c980be1adf6987768152539c1d MD5 | raw file
 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_DWT_H
23#define AVCODEC_DWT_H
24
25/**
26 * Discrete wavelet transform
27 * @file
28 * @author Kamil Nowosad
29 */
30
31#include "avcodec.h"
32
33#define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
34
35enum DWTType{
36    FF_DWT97,
37    FF_DWT53
38};
39
40typedef struct {
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)
47} DWTContext;
48
49/**
50 * initialize DWT
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
55 */
56int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type);
57
58int ff_j2k_dwt_encode(DWTContext *s, int *t);
59int ff_j2k_dwt_decode(DWTContext *s, int *t);
60
61void ff_j2k_dwt_destroy(DWTContext *s);
62
63#endif /* AVCODEC_DWT_H */