mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-25 20:50:09 +00:00
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
|
|
* Rational numbers
|
|
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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;
|
|
}
|
|
|
|
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
|