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48 lines
1.7 KiB
48 lines
1.7 KiB
/* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVFILTER_SCALE_H |
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#define AVFILTER_SCALE_H |
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#include "avfilter.h" |
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/** |
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* Parse and evaluate string expressions for width and height. Upon success, |
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* ff_scale_adjust_dimensions must be called with evaluated width and height |
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* to obtain actual target dimensions. |
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* |
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* Returns 0 upon success, negative value if one of the expressions could |
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* not be parsed or if NaN was the result of their evaluation. |
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*/ |
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int ff_scale_eval_dimensions(void *ctx, |
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const char *w_expr, const char *h_expr, |
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AVFilterLink *inlink, AVFilterLink *outlink, |
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int *ret_w, int *ret_h); |
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/** |
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* Transform evaluated width and height obtained from ff_scale_eval_dimensions |
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* into actual target width and height for scaling. Adjustment can occur if one |
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* or both of the evaluated values are of the form '-n' or if |
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* force_original_aspect_ratio is set. |
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* |
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* Returns 0. |
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*/ |
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int ff_scale_adjust_dimensions(AVFilterLink *inlink, |
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int *ret_w, int *ret_h, |
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int force_original_aspect_ratio, int force_divisible_by); |
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#endif
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