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 34enum DWTType { 35 FF_DWT97, 36 FF_DWT53, 37 FF_DWT97_INT 38}; 39 40typedef struct DWTContext { 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 int32_t *i_linebuf; ///< int buffer used by transform 47 float *f_linebuf; ///< float buffer used by transform 48} DWTContext; 49 50/** 51 * Initialize DWT. 52 * @param s DWT context 53 * @param border coordinates of transformed region {{x0, x1}, {y0, y1}} 54 * @param decomp_levels number of decomposition levels 55 * @param type 0 for DWT 9/7; 1 for DWT 5/3 56 */ 57int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2], 58 int decomp_levels, int type); 59 60int ff_dwt_encode(DWTContext *s, void *t); 61int ff_dwt_decode(DWTContext *s, void *t); 62 63void ff_dwt_destroy(DWTContext *s); 64 65#endif /* AVCODEC_JPEG2000DWT_H */ 66