mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
71 lines
2.0 KiB
71 lines
2.0 KiB
/* |
|
* Rational numbers |
|
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
|
* |
|
* This file is part of FFmpeg. |
|
* |
|
* FFmpeg is free software; you can redistribute it and/or |
|
* modify it under the terms of the GNU Lesser General Public |
|
* License as published by the Free Software Foundation; either |
|
* version 2.1 of the License, or (at your option) any later version. |
|
* |
|
* FFmpeg is distributed in the hope that it will be useful, |
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
* Lesser General Public License for more details. |
|
* |
|
* You should have received a copy of the GNU Lesser General Public |
|
* License along with FFmpeg; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
* |
|
*/ |
|
|
|
/** |
|
* @file rational.h |
|
* Rational numbers. |
|
* @author Michael Niedermayer <michaelni@gmx.at> |
|
*/ |
|
|
|
#ifndef RATIONAL_H |
|
#define RATIONAL_H |
|
|
|
/** |
|
* Rational number num/den. |
|
*/ |
|
typedef struct AVRational{ |
|
int num; ///< numerator |
|
int den; ///< denominator |
|
} AVRational; |
|
|
|
/** |
|
* returns 0 if a==b, 1 if a>b and -1 if a<b. |
|
*/ |
|
static inline int av_cmp_q(AVRational a, AVRational b){ |
|
const int64_t tmp= a.num * (int64_t)b.den - b.num * (int64_t)a.den; |
|
|
|
if(tmp) return (tmp>>63)|1; |
|
else return 0; |
|
} |
|
|
|
/** |
|
* converts the given AVRational to a double. |
|
*/ |
|
static inline double av_q2d(AVRational a){ |
|
return a.num / (double) a.den; |
|
} |
|
|
|
/** |
|
* reduce a fraction. |
|
* This is useful for framerate calculations. |
|
* @param max the maximum allowed for dst_nom & dst_den |
|
* @return 1 if exact, 0 otherwise |
|
*/ |
|
int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max); |
|
|
|
AVRational av_mul_q(AVRational b, AVRational c); |
|
AVRational av_div_q(AVRational b, AVRational c); |
|
AVRational av_add_q(AVRational b, AVRational c); |
|
AVRational av_sub_q(AVRational b, AVRational c); |
|
AVRational av_d2q(double d, int max); |
|
|
|
#endif // RATIONAL_H
|
|
|