mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
888 B
32 lines
888 B
20 years ago
|
#ifndef MATHEMATICS_H
|
||
|
|
#define MATHEMATICS_H
|
||
|
|
|
||
|
|
#include "rational.h"
|
||
|
|
|
||
|
|
enum AVRounding {
|
||
|
|
AV_ROUND_ZERO = 0, ///< round toward zero
|
||
|
|
AV_ROUND_INF = 1, ///< round away from zero
|
||
|
|
AV_ROUND_DOWN = 2, ///< round toward -infinity
|
||
|
|
AV_ROUND_UP = 3, ///< round toward +infinity
|
||
|
|
AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* rescale a 64bit integer with rounding to nearest.
|
||
|
|
* a simple a*b/c isn't possible as it can overflow
|
||
|
|
*/
|
||
|
|
int64_t av_rescale(int64_t a, int64_t b, int64_t c);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* rescale a 64bit integer with specified rounding.
|
||
|
|
* a simple a*b/c isn't possible as it can overflow
|
||
|
|
*/
|
||
|
|
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* rescale a 64bit integer by 2 rational numbers.
|
||
|
|
*/
|
||
|
|
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq);
|
||
|
|
|
||
|
|
#endif /* MATHEMATICS_H */
|