libvo/filter_kernels.h

   1 /*
   2  * This file is part of mplayer2.
   3  *
   4  * mplayer2 is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * mplayer2 is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with mplayer2; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef MPLAYER_FILTER_KERNELS_H
  20 #define MPLAYER_FILTER_KERNELS_H
  21
  22 #include <stdbool.h>
  23
  24 struct filter_kernel {
  25     const char *name;
  26     double radius;
  27     double (*weight)(struct filter_kernel *kernel, double x);
  28
  29     // The filter params can be changed at runtime. Only used by some filters.
  30     float params[2];
  31     // The following values are set by mp_init_filter() at runtime.
  32     // Number of coefficients; equals the rounded up radius multiplied with 2.
  33     int size;
  34     double inv_scale;
  35 };
  36
  37 extern const struct filter_kernel mp_filter_kernels[];
  38
  39 const struct filter_kernel *mp_find_filter_kernel(const char *name);
  40 bool mp_init_filter(struct filter_kernel *filter, const int *sizes,
  41                     double scale);
  42 void mp_compute_weights(struct filter_kernel *filter, double f, float *out_w);
  43 void mp_compute_lut(struct filter_kernel *filter, int count, float *out_array);
  44
  45 #endif /* MPLAYER_FILTER_KERNELS_H */