/* * 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 */ #ifndef AVFILTER_SCALE_EVAL_H#define AVFILTER_SCALE_EVAL_H #include "avfilter.h" /** * 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);#endif