AVRational
[libav.git] / libavcodec / rational.h
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
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 *
19 */
20
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
30 typedef struct AVRational{
31 int num;
32 int den;
33 } AVRational;
34
35 static inline int av_cmp_q(AVRational a, AVRational b){
36 const int64_t tmp= a.num * (int64_t)b.den - b.num * (int64_t)a.den;
37
38 if (tmp < 0) return -1;
39 else if(tmp == 0) return 0;
40 else return 1;
41 }
42
43 static inline double av_q2d(AVRational a){
44 return a.num / (double) a.den;
45 }
46
47 AVRational av_mul_q(AVRational b, AVRational c);
48 AVRational av_div_q(AVRational b, AVRational c);
49 AVRational av_add_q(AVRational b, AVRational c);
50 AVRational av_sub_q(AVRational b, AVRational c);
51 AVRational av_d2q(double d, int max);
52
53 #endif // RATIONAL_H