ffmpeg / libavutil / mathematics.h @ 5b21bdab
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/*


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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 021101301 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 */ 