1 /* 2 * This file is part of FFmpeg. 3 * 4 * FFmpeg is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation; either 7 * version 2.1 of the License, or (at your option) any later version. 8 * 9 * FFmpeg 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 GNU 12 * Lesser General Public License for more details. 13 * 14 * You should have received a copy of the GNU Lesser General Public 15 * License along with FFmpeg; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 19 #ifndef AVFILTER_SCALE_EVAL_H 20 #define AVFILTER_SCALE_EVAL_H 21 22 #include "avfilter.h" 23 24 /** 25 * Parse and evaluate string expressions for width and height. Upon success, 26 * ff_scale_adjust_dimensions must be called with evaluated width and height 27 * to obtain actual target dimensions. 28 * 29 * Returns 0 upon success, negative value if one of the expressions could 30 * not be parsed or if NaN was the result of their evaluation. 31 */ 32 int ff_scale_eval_dimensions(void *ctx, 33 const char *w_expr, const char *h_expr, 34 AVFilterLink *inlink, AVFilterLink *outlink, 35 int *ret_w, int *ret_h); 36 37 /** 38 * Transform evaluated width and height obtained from ff_scale_eval_dimensions 39 * into actual target width and height for scaling. Adjustment can occur if one 40 * or both of the evaluated values are of the form '-n' or if 41 * force_original_aspect_ratio is set. 42 * 43 * Returns 0. 44 */ 45 int ff_scale_adjust_dimensions(AVFilterLink *inlink, 46 int *ret_w, int *ret_h, 47 int force_original_aspect_ratio, int force_divisible_by); 48 #endif 49