| /* |
| * Discrete wavelet transform |
| * Copyright (c) 2007 Kamil Nowosad |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #ifndef AVCODEC_DWT_H |
| #define AVCODEC_DWT_H |
| |
| /** |
| * Discrete wavelet transform |
| * @file |
| * @author Kamil Nowosad |
| */ |
| |
| #include "avcodec.h" |
| |
| #define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels |
| |
| enum DWTType{ |
| FF_DWT97, |
| FF_DWT53 |
| }; |
| |
| typedef struct { |
| ///line lengths {horizontal, vertical} in consecutive decomposition levels |
| uint16_t linelen[FF_DWT_MAX_DECLVLS][2]; |
| uint8_t mod[FF_DWT_MAX_DECLVLS][2]; ///< coordinates (x0, y0) of decomp. levels mod 2 |
| uint8_t ndeclevels; ///< number of decomposition levels |
| uint8_t type; ///< 0 for 9/7; 1 for 5/3 |
| void *linebuf; ///< buffer used by transform (int or float) |
| } DWTContext; |
| |
| /** |
| * initialize DWT |
| * @param s DWT context |
| * @param border coordinates of transformed region {{x0, x1}, {y0, y1}} |
| * @param decomp_levels number of decomposition levels |
| * @param type 0 for DWT 9/7; 1 for DWT 5/3 |
| */ |
| int ff_j2k_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type); |
| |
| int ff_j2k_dwt_encode(DWTContext *s, int *t); |
| int ff_j2k_dwt_decode(DWTContext *s, int *t); |
| |
| void ff_j2k_dwt_destroy(DWTContext *s); |
| |
| #endif /* AVCODEC_DWT_H */ |