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ffmpeg / libavutil / mathematics.h @ c11c2bc2

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#ifndef MATHEMATICS_H
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#define 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 /* MATHEMATICS_H */