Main Page
Related Pages
Modules
Data Structures
Files
Examples
File List
Globals
libavutil
mathematics.h
Go to the documentation of this file.
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
{
50
AV_ROUND_ZERO
= 0,
51
AV_ROUND_INF
= 1,
52
AV_ROUND_DOWN
= 2,
53
AV_ROUND_UP
= 3,
54
AV_ROUND_NEAR_INF
= 5,
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 */