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