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69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
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/*
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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_JPEG2000DWT_H
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#define AVCODEC_JPEG2000DWT_H
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/**
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* @file
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* Discrete wavelet transform
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*/
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#include <stdint.h>
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#define FF_DWT_MAX_DECLVLS 32 ///< max number of decomposition levels
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#define F_LFTG_K 1.230174104914001f
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#define F_LFTG_X 0.812893066115961f
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enum DWTType {
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FF_DWT97,
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FF_DWT53,
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FF_DWT97_INT,
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FF_DWT_NB
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};
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typedef struct DWTContext {
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/// line lengths { horizontal, vertical } in consecutive decomposition levels
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int 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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int32_t *i_linebuf; ///< int buffer used by transform
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float *f_linebuf; ///< float buffer used by transform
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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_jpeg2000_dwt_init(DWTContext *s, int border[2][2],
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int decomp_levels, int type);
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int ff_dwt_encode(DWTContext *s, void *t);
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int ff_dwt_decode(DWTContext *s, void *t);
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void ff_dwt_destroy(DWTContext *s);
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#endif /* AVCODEC_JPEG2000DWT_H */
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