52 lines
1.7 KiB
C
52 lines
1.7 KiB
C
/*
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* copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
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*
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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 FFMPEG_MATHEMATICS_H
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#define FFMPEG_MATHEMATICS_H
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#include "rational.h"
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enum AVRounding {
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AV_ROUND_ZERO = 0, ///< round toward zero
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AV_ROUND_INF = 1, ///< round away from zero
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AV_ROUND_DOWN = 2, ///< round toward -infinity
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AV_ROUND_UP = 3, ///< round toward +infinity
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AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero
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};
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/**
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* rescale a 64bit integer with rounding to nearest.
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* a simple a*b/c isn't possible as it can overflow
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*/
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int64_t av_rescale(int64_t a, int64_t b, int64_t c);
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/**
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* rescale a 64bit integer with specified rounding.
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* a simple a*b/c isn't possible as it can overflow
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*/
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int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding);
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/**
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* rescale a 64bit integer by 2 rational numbers.
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*/
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int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq);
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#endif /* FFMPEG_MATHEMATICS_H */
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