j2k_dwt.h
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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_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 
35 enum DWTType{
38 };
39 
40 typedef 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  */
56 int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type);
57 
58 int ff_j2k_dwt_encode(DWTContext *s, int *t);
59 int ff_j2k_dwt_decode(DWTContext *s, int *t);
60 
62 
63 #endif /* AVCODEC_DWT_H */
const char * s
Definition: avisynth_c.h:668
uint8_t ndeclevels
number of decomposition levels
Definition: j2k_dwt.h:44
struct DWTContext DWTContext
DWTType
Definition: j2k_dwt.h:35
uint8_t type
0 for 9/7; 1 for 5/3
Definition: j2k_dwt.h:45
uint8_t
external API header
t
Definition: genspecsines3.m:6
void * linebuf
buffer used by transform (int or float)
Definition: j2k_dwt.h:46
int ff_j2k_dwt_decode(DWTContext *s, int *t)
Definition: j2k_dwt.c:370
#define FF_DWT_MAX_DECLVLS
max number of decomposition levels
Definition: j2k_dwt.h:33
int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type)
initialize DWT
Definition: j2k_dwt.c:319
#define type
int ff_j2k_dwt_encode(DWTContext *s, int *t)
Definition: j2k_dwt.c:357
void ff_j2k_dwt_destroy(DWTContext *s)
Definition: j2k_dwt.c:383