| /* | |
| * This file is part of FFmpeg. | |
| * | |
| * FFmpeg 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. | |
| * | |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software | |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| */ | |
| /** | |
| * Parse and evaluate string expressions for width and height. Upon success, | |
| * ff_scale_adjust_dimensions must be called with evaluated width and height | |
| * to obtain actual target dimensions. | |
| * | |
| * Returns 0 upon success, negative value if one of the expressions could | |
| * not be parsed or if NaN was the result of their evaluation. | |
| */ | |
| int ff_scale_eval_dimensions(void *ctx, | |
| const char *w_expr, const char *h_expr, | |
| AVFilterLink *inlink, AVFilterLink *outlink, | |
| int *ret_w, int *ret_h); | |
| /** | |
| * Transform evaluated width and height obtained from ff_scale_eval_dimensions | |
| * into actual target width and height for scaling. Adjustment can occur if one | |
| * or both of the evaluated values are of the form '-n' or if | |
| * force_original_aspect_ratio is set. force_divisible_by is used only when | |
| * force_original_aspect_ratio is set and must be at least 1. | |
| * | |
| * Returns 0. | |
| */ | |
| int ff_scale_adjust_dimensions(AVFilterLink *inlink, | |
| int *ret_w, int *ret_h, | |
| int force_original_aspect_ratio, int force_divisible_by); | |