Added GemRB sources

project/jni/application/gemrb/src/plugins/BIKPlayer/rational.cpp

@@ -0,0 +1,83 @@
+/*
+ * 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 libavutil/rational.c
+ * rational numbers
+ * @author Michael Niedermayer <michaelni@gmx.at>
+ */
+
+#include <assert.h>
+#include <limits.h>
+
+#include "common.h"
+#include "rational.h"
+
+int64_t av_gcd(int64_t a, int64_t b){
+    if(b) return av_gcd(b, a%b);
+    return a;
+}
+
+int av_reduce(int &dst_num, int &dst_den, int64_t num, int64_t den, int64_t max) {
+    AVRational a0={0,1}, a1={1,0};
+    int sign= (num<0) ^ (den<0);
+    int64_t gcd= av_gcd(FFABS(num), FFABS(den));
+
+    if(gcd){
+        num = FFABS(num)/gcd;
+        den = FFABS(den)/gcd;
+    }
+    if(num<=max && den<=max){
+      a1.num = num;
+      a1.den = den;      
+      den=0;
+    }
+
+    while(den){
+        uint64_t x      = num / den;
+        int64_t next_den= num - den*x;
+        int64_t a2n= x*a1.num + a0.num;
+        int64_t a2d= x*a1.den + a0.den;
+
+        if(a2n > max || a2d > max){
+            if(a1.num) x= (max - a0.num) / a1.num;
+            if(a1.den) x= FFMIN(x, (max - a0.den) / a1.den);
+
+            if (den*(2*x*a1.den + a0.den) > num*a1.den) {
+                a1.den  =x*a1.den + a0.den;
+                a1.num  =x*a1.num + a0.num;
+            }
+            break;
+        }
+
+        a0 = a1;
+        a1.den = a2d;
+        a1.num = a2n;
+        num = den;
+        den = next_den;
+    }
+    assert(av_gcd(a1.num, a1.den) <= 1U);
+
+    dst_num = sign ? -a1.num : a1.num;
+    dst_den = a1.den;
+
+    return den==0;
+}