27 #ifndef AVUTIL_MATHEMATICS_H
28 #define AVUTIL_MATHEMATICS_H
37 #define M_E 2.7182818284590452354
40 #define M_LN2 0.69314718055994530942
43 #define M_LN10 2.30258509299404568402
46 #define M_LOG2_10 3.32192809488736234787
49 #define M_PHI 1.61803398874989484820
52 #define M_PI 3.14159265358979323846
55 #define M_PI_2 1.57079632679489661923
58 #define M_SQRT1_2 0.70710678118654752440
61 #define M_SQRT2 1.41421356237309504880
64 #define NAN av_int2float(0x7fc00000)
67 #define INFINITY av_int2float(0x7f800000)
Macro definitions for various function/variable attributes.
int64_t av_add_stable(AVRational ts_tb, int64_t ts, AVRational inc_tb, int64_t inc)
Add a value to a timestamp.
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
Compare two timestamps each in its own time base.
int64_t av_rescale_delta(AVRational in_tb, int64_t in_ts, AVRational fs_tb, int duration, int64_t *last, AVRational out_tb)
Rescale a timestamp while preserving known durations.
int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const
Rescale a 64-bit integer with rounding to nearest.
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding rnd) av_const
Rescale a 64-bit integer with specified rounding.
AVRounding
Rounding methods.
int64_t av_const av_gcd(int64_t a, int64_t b)
Compute the greatest common divisor of two integer operands.
int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, enum AVRounding rnd) av_const
Rescale a 64-bit integer by 2 rational numbers with specified rounding.
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const
Rescale a 64-bit integer by 2 rational numbers.
int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod)
Compare the remainders of two integer operands divided by a common divisor.
@ AV_ROUND_INF
Round away from zero.
@ AV_ROUND_ZERO
Round toward zero.
@ AV_ROUND_DOWN
Round toward -infinity.
@ AV_ROUND_PASS_MINMAX
Flag telling rescaling functions to pass INT64_MIN/MAX through unchanged, avoiding special cases for ...
@ AV_ROUND_UP
Round toward +infinity.
@ AV_ROUND_NEAR_INF
Round to nearest and halfway cases away from zero.
Utilties for rational number calculation.
Rational number (pair of numerator and denominator).
static int mod(int a, int b)
Modulo operation with only positive remainders.