Libav
mathematics.h
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1 /*
2  * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of Libav.
5  *
6  * Libav is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * Libav is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #ifndef AVUTIL_MATHEMATICS_H
22 #define AVUTIL_MATHEMATICS_H
23 
24 #include <stdint.h>
25 #include <math.h>
26 #include "attributes.h"
27 #include "rational.h"
28 #include "intfloat.h"
29 
30 #ifndef M_LOG2_10
31 #define M_LOG2_10 3.32192809488736234787 /* log_2 10 */
32 #endif
33 #ifndef M_PHI
34 #define M_PHI 1.61803398874989484820 /* phi / golden ratio */
35 #endif
36 #ifndef NAN
37 #define NAN av_int2float(0x7fc00000)
38 #endif
39 #ifndef INFINITY
40 #define INFINITY av_int2float(0x7f800000)
41 #endif
42 
49 enum AVRounding {
55 };
56 
62 int64_t av_const av_gcd(int64_t a, int64_t b);
63 
68 int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const;
69 
74 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const;
75 
79 int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const;
80 
84 int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq,
85  enum AVRounding) av_const;
86 
93 int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b);
94 
105 int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod);
106 
111 #endif /* AVUTIL_MATHEMATICS_H */
#define av_const
Definition: attributes.h:60
int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const
Rescale a 64-bit integer with specified rounding.
Definition: mathematics.c:61
AVRounding
Definition: mathematics.h:49
Macro definitions for various function/variable attributes.
Round toward +infinity.
Definition: mathematics.h:53
#define b
Definition: input.c:52
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:129
Round away from zero.
Definition: mathematics.h:51
Round to nearest and halfway cases away from zero.
Definition: mathematics.h:54
int64_t av_const av_gcd(int64_t a, int64_t b)
Return the greatest common divisor of a and b.
Definition: mathematics.c:53
int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b)
Compare 2 timestamps each in its own timebases.
Definition: mathematics.c:134
int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, enum AVRounding) av_const
Rescale a 64-bit integer by 2 rational numbers with specified rounding.
Definition: mathematics.c:121
int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const
Rescale a 64-bit integer with rounding to nearest.
Definition: mathematics.c:116
Round toward zero.
Definition: mathematics.h:50
rational number numerator/denominator
Definition: rational.h:43
Round toward -infinity.
Definition: mathematics.h:52
rational numbers
int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod)
Compare 2 integers modulo mod.
Definition: mathematics.c:145