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