Separate library install into static and shared installation.
[libav.git] / libavutil / rational.h
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1/*
2 * Rational numbers
3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
5509bffa 17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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18 *
19 */
115329f1 20
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21/**
22 * @file rational.h
23 * Rational numbers.
24 * @author Michael Niedermayer <michaelni@gmx.at>
25 */
26
27#ifndef RATIONAL_H
28#define RATIONAL_H
29
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30/**
31 * Rational number num/den.
32 */
5ff85f1d 33typedef struct AVRational{
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34 int num; ///< numerator
35 int den; ///< denominator
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36} AVRational;
37
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38/**
39 * returns 0 if a==b, 1 if a>b and -1 if a<b.
40 */
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41static inline int av_cmp_q(AVRational a, AVRational b){
42 const int64_t tmp= a.num * (int64_t)b.den - b.num * (int64_t)a.den;
43
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44 if(tmp) return (tmp>>63)|1;
45 else return 0;
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46}
47
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48/**
49 * converts the given AVRational to a double.
50 */
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51static inline double av_q2d(AVRational a){
52 return a.num / (double) a.den;
53}
54
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55/**
56 * reduce a fraction.
57 * this is usefull for framerate calculations
58 * @param max the maximum allowed for dst_nom & dst_den
59 * @return 1 if exact, 0 otherwise
60 */
61int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max);
62
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63AVRational av_mul_q(AVRational b, AVRational c);
64AVRational av_div_q(AVRational b, AVRational c);
65AVRational av_add_q(AVRational b, AVRational c);
66AVRational av_sub_q(AVRational b, AVRational c);
67AVRational av_d2q(double d, int max);
68
69#endif // RATIONAL_H