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libavutil/rational.h

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00001 /*
00002  * rational numbers
00003  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #ifndef AVUTIL_RATIONAL_H
00029 #define AVUTIL_RATIONAL_H
00030 
00031 #include <stdint.h>
00032 #include "attributes.h"
00033 
00037 typedef struct AVRational{
00038     int num; 
00039     int den; 
00040 } AVRational;
00041 
00048 static inline int av_cmp_q(AVRational a, AVRational b){
00049     const int64_t tmp= a.num * (int64_t)b.den - b.num * (int64_t)a.den;
00050 
00051     if(tmp) return (tmp>>63)|1;
00052     else    return 0;
00053 }
00054 
00060 static inline double av_q2d(AVRational a){
00061     return a.num / (double) a.den;
00062 }
00063 
00074 int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max);
00075 
00082 AVRational av_mul_q(AVRational b, AVRational c) av_const;
00083 
00090 AVRational av_div_q(AVRational b, AVRational c) av_const;
00091 
00098 AVRational av_add_q(AVRational b, AVRational c) av_const;
00099 
00106 AVRational av_sub_q(AVRational b, AVRational c) av_const;
00107 
00114 AVRational av_d2q(double d, int max) av_const;
00115 
00120 int av_nearer_q(AVRational q, AVRational q1, AVRational q2);
00121 
00127 int av_find_nearest_q_idx(AVRational q, const AVRational* q_list);
00128 
00129 #endif /* AVUTIL_RATIONAL_H */

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