* arbitrary precision integers
* Copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
*/
/**
* @author Michael Niedermayer <michaelni@gmx.at>
*/
-#ifndef INTEGER_H
-#define INTEGER_H
+#ifndef FFMPEG_INTEGER_H
+#define FFMPEG_INTEGER_H
+
+#include <stdint.h>
+#include "common.h"
#define AV_INTEGER_SIZE 8
uint16_t v[AV_INTEGER_SIZE];
} AVInteger;
-AVInteger av_add_i(AVInteger a, AVInteger b);
-AVInteger av_sub_i(AVInteger a, AVInteger b);
-int av_log2_i(AVInteger a);
-AVInteger av_mul_i(AVInteger a, AVInteger b);
-int av_cmp_i(AVInteger a, AVInteger b);
-AVInteger av_shr_i(AVInteger a, int s);
+AVInteger av_add_i(AVInteger a, AVInteger b) av_const;
+AVInteger av_sub_i(AVInteger a, AVInteger b) av_const;
+
+/**
+ * returns the rounded down value of the logarithm of base 2 of the given AVInteger.
+ * this is simply the index of the most significant bit which is 1. Or 0 of all bits are 0
+ */
+int av_log2_i(AVInteger a) av_const;
+AVInteger av_mul_i(AVInteger a, AVInteger b) av_const;
+
+/**
+ * returns 0 if a==b, 1 if a>b and -1 if a<b.
+ */
+int av_cmp_i(AVInteger a, AVInteger b) av_const;
+
+/**
+ * bitwise shift.
+ * @param s the number of bits by which the value should be shifted right, may be negative for shifting left
+ */
+AVInteger av_shr_i(AVInteger a, int s) av_const;
+
+/**
+ * returns a % b.
+ * @param quot a/b will be stored here
+ */
AVInteger av_mod_i(AVInteger *quot, AVInteger a, AVInteger b);
-AVInteger av_div_i(AVInteger a, AVInteger b);
-AVInteger av_int2i(int64_t a);
-int64_t av_i2int(AVInteger a);
-#endif // INTEGER_H
+/**
+ * returns a/b.
+ */
+AVInteger av_div_i(AVInteger a, AVInteger b) av_const;
+
+/**
+ * converts the given int64_t to an AVInteger.
+ */
+AVInteger av_int2i(int64_t a) av_const;
+
+/**
+ * converts the given AVInteger to an int64_t.
+ * if the AVInteger is too large to fit into an int64_t,
+ * then only the least significant 64bit will be used
+ */
+int64_t av_i2int(AVInteger a) av_const;
+
+#endif /* FFMPEG_INTEGER_H */