## ffmpeg / libavcodec / rational.h @ 20646267

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1 | 5ff85f1d | Michael Niedermayer | ```
/*
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2 | ```
* Rational numbers
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3 | ```
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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4 | ```
*
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5 | ```
* This library is free software; you can redistribute it and/or
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6 | ```
* modify it under the terms of the GNU Lesser General Public
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7 | ```
* License as published by the Free Software Foundation; either
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8 | ```
* version 2 of the License, or (at your option) any later version.
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9 | ```
*
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10 | ```
* This library is distributed in the hope that it will be useful,
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11 | ```
* but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 | ```
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 | ```
* Lesser General Public License for more details.
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14 | ```
*
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15 | ```
* You should have received a copy of the GNU Lesser General Public
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16 | ```
* License along with this library; if not, write to the Free Software
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17 | ```
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 | ```
*
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19 | ```
*/
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20 | |||

21 | ```
/**
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22 | ```
* @file rational.h
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23 | ```
* Rational numbers.
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24 | ```
* @author Michael Niedermayer <michaelni@gmx.at>
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25 | ```
*/
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26 | |||

27 | ```
#ifndef RATIONAL_H
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28 | ```
#define RATIONAL_H
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29 | |||

30 | typedef struct AVRational{ |
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31 | ```
int num;
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32 | ```
int den;
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33 | } AVRational; |
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34 | |||

35 | static inline int av_cmp_q(AVRational a, AVRational b){ |
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36 | ```
const int64_t tmp= a.num * (int64_t)b.den - b.num * (int64_t)a.den;
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37 | |||

38 | if (tmp < 0) return -1; |
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39 | else if(tmp == 0) return 0; |
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40 | else return 1; |
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41 | } |
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42 | |||

43 | static inline double av_q2d(AVRational a){ |
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44 | return a.num / (double) a.den; |
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45 | } |
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46 | |||

47 | AVRational av_mul_q(AVRational b, AVRational c); |
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48 | AVRational av_div_q(AVRational b, AVRational c); |
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49 | AVRational av_add_q(AVRational b, AVRational c); |
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50 | AVRational av_sub_q(AVRational b, AVRational c); |
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51 | AVRational av_d2q(double d, int max); |
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52 | |||

53 | #endif // RATIONAL_H |