add some missing formats: lmlm4, pva, pcx and sun rasterfile.
[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>
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25#include "rational.h"
26
27enum AVRounding {
28 AV_ROUND_ZERO = 0, ///< round toward zero
29 AV_ROUND_INF = 1, ///< round away from zero
30 AV_ROUND_DOWN = 2, ///< round toward -infinity
31 AV_ROUND_UP = 3, ///< round toward +infinity
32 AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero
33};
34
35/**
36 * rescale a 64bit integer with rounding to nearest.
37 * a simple a*b/c isn't possible as it can overflow
38 */
2119bb8f 39int64_t av_rescale(int64_t a, int64_t b, int64_t c);
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40
41/**
42 * rescale a 64bit integer with specified rounding.
43 * a simple a*b/c isn't possible as it can overflow
44 */
2119bb8f 45int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding);
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46
47/**
48 * rescale a 64bit integer by 2 rational numbers.
49 */
2119bb8f 50int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq);
c11c2bc2 51
5b21bdab 52#endif /* FFMPEG_MATHEMATICS_H */