blob: 718d183ac159e1b6c07043d1ab286d7e1da24a75
| 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 | |
| 36 | enum DWTType { |
| 37 | FF_DWT97, |
| 38 | FF_DWT53, |
| 39 | FF_DWT97_INT, |
| 40 | FF_DWT_NB |
| 41 | }; |
| 42 | |
| 43 | typedef struct DWTContext { |
| 44 | /// line lengths { horizontal, vertical } in consecutive decomposition levels |
| 45 | int linelen[FF_DWT_MAX_DECLVLS][2]; |
| 46 | uint8_t mod[FF_DWT_MAX_DECLVLS][2]; ///< coordinates (x0, y0) of decomp. levels mod 2 |
| 47 | uint8_t ndeclevels; ///< number of decomposition levels |
| 48 | uint8_t type; ///< 0 for 9/7; 1 for 5/3 |
| 49 | int32_t *i_linebuf; ///< int buffer used by transform |
| 50 | float *f_linebuf; ///< float buffer used by transform |
| 51 | } DWTContext; |
| 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 | */ |
| 60 | int ff_jpeg2000_dwt_init(DWTContext *s, int border[2][2], |
| 61 | int decomp_levels, int type); |
| 62 | |
| 63 | int ff_dwt_encode(DWTContext *s, void *t); |
| 64 | int ff_dwt_decode(DWTContext *s, void *t); |
| 65 | |
| 66 | void ff_dwt_destroy(DWTContext *s); |
| 67 | |
| 68 | #endif /* AVCODEC_JPEG2000DWT_H */ |
| 69 |