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Diffstat (limited to 'libavcodec/rational.h')
| -rw-r--r-- | libavcodec/rational.h | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/libavcodec/rational.h b/libavcodec/rational.h new file mode 100644 index 0000000000..d5fc77f1a6 --- /dev/null +++ b/libavcodec/rational.h @@ -0,0 +1,53 @@ +/* + * 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 + +typedef struct AVRational{ + int num; + int den; +} AVRational; + +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 < 0) return -1; + else if(tmp == 0) return 0; + else return 1; +} + +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 |