/* * Discrete wavelet transform * Copyright (c) 2007 Kamil Nowosad * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_JPEG2000DWT_H #define AVCODEC_JPEG2000DWT_H /** * @file * Discrete wavelet transform */ #include <stdint.h> #define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels enum DWTType { FF_DWT97, FF_DWT53, FF_DWT97_INT, FF_DWT_NB }; typedef struct DWTContext { /// 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 int32_t *i_linebuf; ///< int buffer used by transform float *f_linebuf; ///< float buffer used by transform } 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_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2], int decomp_levels, int type); int ff_dwt_decode(DWTContext *s, void *t); void ff_dwt_destroy(DWTContext *s); #endif /* AVCODEC_JPEG2000DWT_H */