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[libav.git] / libavutil / mathematics.h
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1/*
2 * copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at>
3 *
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4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
b78e7197 9 * version 2.1 of the License, or (at your option) any later version.
04d7f601 10 *
b78e7197 11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
b78e7197 17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
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21#ifndef FFMPEG_MATHEMATICS_H
22#define FFMPEG_MATHEMATICS_H
c11c2bc2 23
6ef29128 24#include <stdint.h>
d1a12956 25#include <math.h>
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26#include "rational.h"
27
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28#ifndef M_E
29#define M_E 2.7182818284590452354 /* e */
30#endif
31#ifndef M_LN2
32#define M_LN2 0.69314718055994530942 /* log_e 2 */
33#endif
34#ifndef M_LN10
35#define M_LN10 2.30258509299404568402 /* log_e 10 */
36#endif
37#ifndef M_SQRT1_2
38#define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */
39#endif
40
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41enum AVRounding {
42 AV_ROUND_ZERO = 0, ///< round toward zero
43 AV_ROUND_INF = 1, ///< round away from zero
44 AV_ROUND_DOWN = 2, ///< round toward -infinity
45 AV_ROUND_UP = 3, ///< round toward +infinity
46 AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero
47};
48
49/**
50 * rescale a 64bit integer with rounding to nearest.
51 * a simple a*b/c isn't possible as it can overflow
52 */
85074d3c 53int64_t av_rescale(int64_t a, int64_t b, int64_t c) av_const;
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54
55/**
56 * rescale a 64bit integer with specified rounding.
57 * a simple a*b/c isn't possible as it can overflow
58 */
85074d3c 59int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding) av_const;
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60
61/**
62 * rescale a 64bit integer by 2 rational numbers.
63 */
85074d3c 64int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const;
c11c2bc2 65
5b21bdab 66#endif /* FFMPEG_MATHEMATICS_H */