Create symbolic links for all library sonames and clean up Makefiles.
[libav.git] / libavutil / mathematics.h
1 #ifndef MATHEMATICS_H
2 #define MATHEMATICS_H
3
4 #include "rational.h"
5
6 enum AVRounding {
7 AV_ROUND_ZERO = 0, ///< round toward zero
8 AV_ROUND_INF = 1, ///< round away from zero
9 AV_ROUND_DOWN = 2, ///< round toward -infinity
10 AV_ROUND_UP = 3, ///< round toward +infinity
11 AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero
12 };
13
14 /**
15 * rescale a 64bit integer with rounding to nearest.
16 * a simple a*b/c isn't possible as it can overflow
17 */
18 int64_t av_rescale(int64_t a, int64_t b, int64_t c);
19
20 /**
21 * rescale a 64bit integer with specified rounding.
22 * a simple a*b/c isn't possible as it can overflow
23 */
24 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding);
25
26 /**
27 * rescale a 64bit integer by 2 rational numbers.
28 */
29 int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq);
30
31 #endif /* MATHEMATICS_H */