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179830108d
When force_original_aspect_ratio and force_divisible_by are both used, dimensions are now rounded to the nearest allowed multiple of force_divisible_by rather than first rounding to the nearest integer and then rounding in a static direction. This results in less distortion of the aspect ratio. Reviewed-by: Thierry Foucu <tfoucu@google.com> Signed-off-by: Tristan Schmelcher <tschmelcher@google.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/*
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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_EVAL_H
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#define AVFILTER_SCALE_EVAL_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. force_divisible_by is used only when
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* force_original_aspect_ratio is set and must be at least 1.
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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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