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  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.  
  34. enum DWTType {
  35.     FF_DWT97,
  36.     FF_DWT53,
  37.     FF_DWT97_INT
  38. };
  39.  
  40. typedef 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.  */
  57. int ff_jpeg2000_dwt_init(DWTContext *s, uint16_t border[2][2],
  58.                          int decomp_levels, int type);
  59.  
  60. int ff_dwt_encode(DWTContext *s, void *t);
  61. int ff_dwt_decode(DWTContext *s, void *t);
  62.  
  63. void ff_dwt_destroy(DWTContext *s);
  64.  
  65. #endif /* AVCODEC_JPEG2000DWT_H */
  66.