mathematics.h
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上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:1k
源码类别:
Windows CE
开发平台:
C/C++
- #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 */