1 | /*
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2 | * copyright (c) 2005 Michael Niedermayer <[email protected]>
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3 | *
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4 | * This file is part of FFmpeg.
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5 | *
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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
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8 | * License as published by the Free Software Foundation; either
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9 | * version 2.1 of the License, or (at your option) any later version.
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10 | *
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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
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13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 | * Lesser General Public License for more details.
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15 | *
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16 | * You should have received a copy of the GNU Lesser General Public
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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
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19 | */
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20 |
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21 | #ifndef MATHEMATICS_H
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22 | #define MATHEMATICS_H
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23 |
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24 | #include "rational.h"
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25 |
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26 | enum AVRounding {
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27 | AV_ROUND_ZERO = 0, ///< round toward zero
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28 | AV_ROUND_INF = 1, ///< round away from zero
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29 | AV_ROUND_DOWN = 2, ///< round toward -infinity
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30 | AV_ROUND_UP = 3, ///< round toward +infinity
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31 | AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero
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32 | };
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33 |
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34 | /**
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35 | * rescale a 64bit integer with rounding to nearest.
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36 | * a simple a*b/c isn't possible as it can overflow
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37 | */
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38 | int64_t av_rescale(int64_t a, int64_t b, int64_t c);
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39 |
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40 | /**
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41 | * rescale a 64bit integer with specified rounding.
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42 | * a simple a*b/c isn't possible as it can overflow
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43 | */
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44 | int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding);
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45 |
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46 | /**
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47 | * rescale a 64bit integer by 2 rational numbers.
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48 | */
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49 | int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq);
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50 |
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51 | #endif /* MATHEMATICS_H */
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