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 
29 #ifndef M_E
30 #define M_E 2.7182818284590452354 /* e */
31 #endif
32 #ifndef M_LN2
33 #define M_LN2 0.69314718055994530942 /* log_e 2 */
34 #endif
35 #ifndef M_LN10
36 #define M_LN10 2.30258509299404568402 /* log_e 10 */
37 #endif
38 #ifndef M_LOG2_10
39 #define M_LOG2_10 3.32192809488736234787 /* log_2 10 */
40 #endif
41 #ifndef M_PHI
42 #define M_PHI 1.61803398874989484820 /* phi / golden ratio */
43 #endif
44 #ifndef M_PI
45 #define M_PI 3.14159265358979323846 /* pi */
46 #endif
47 #ifndef M_SQRT1_2
48 #define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
49 #endif
50 #ifndef M_SQRT2
51 #define M_SQRT2 1.41421356237309504880 /* sqrt(2) */
52 #endif
53 #ifndef NAN
54 #define NAN (0.0/0.0)
55 #endif
56 #ifndef INFINITY
57 #define INFINITY (1.0/0.0)
58 #endif
59 
66 enum AVRounding {
72 };
73 
79 int64_t av_const av_gcd(int64_t a, int64_t b);
80 
85 int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const;
86 
91 int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const;
92 
96 int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const;
97 
104 int av_compare_ts(int64_t ts_a, AVRational tb_a, int64_t ts_b, AVRational tb_b);
105 
116 int64_t av_compare_mod(uint64_t a, uint64_t b, uint64_t mod);
117 
122 #endif /* AVUTIL_MATHEMATICS_H */