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32 lines
888 B
C
32 lines
888 B
C
#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 */
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