add rational.h

2004-08-08 19:08:40 +00:00
parent 551800cceb
commit 8e706dc26b
1 changed files with 53 additions and 0 deletions
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+/*
+ * 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