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49 lines
1.7 KiB
49 lines
1.7 KiB
/* |
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* copyright (c) 2005 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef MATHEMATICS_H |
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#define MATHEMATICS_H |
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#include "rational.h" |
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enum AVRounding { |
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AV_ROUND_ZERO = 0, ///< round toward zero |
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AV_ROUND_INF = 1, ///< round away from zero |
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AV_ROUND_DOWN = 2, ///< round toward -infinity |
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AV_ROUND_UP = 3, ///< round toward +infinity |
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AV_ROUND_NEAR_INF = 5, ///< round to nearest and halfway cases away from zero |
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}; |
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/** |
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* rescale a 64bit integer with rounding to nearest. |
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* a simple a*b/c isn't possible as it can overflow |
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*/ |
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int64_t av_rescale(int64_t a, int64_t b, int64_t c); |
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/** |
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* rescale a 64bit integer with specified rounding. |
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* a simple a*b/c isn't possible as it can overflow |
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*/ |
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int64_t av_rescale_rnd(int64_t a, int64_t b, int64_t c, enum AVRounding); |
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/** |
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* rescale a 64bit integer by 2 rational numbers. |
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*/ |
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int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq); |
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#endif /* MATHEMATICS_H */
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