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45 lines
1.3 KiB
45 lines
1.3 KiB
/* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 FFmpeg; 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 AVFILTER_HERMITE_H |
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#define AVFILTER_HERMITE_H |
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static inline double hermite_interpolation(double x, double x0, double x1, |
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double p0, double p1, |
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double m0, double m1) |
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{ |
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double width = x1 - x0; |
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double t = (x - x0) / width; |
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double t2, t3; |
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double ct0, ct1, ct2, ct3; |
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m0 *= width; |
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m1 *= width; |
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t2 = t*t; |
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t3 = t2*t; |
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ct0 = p0; |
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ct1 = m0; |
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ct2 = -3 * p0 - 2 * m0 + 3 * p1 - m1; |
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ct3 = 2 * p0 + m0 - 2 * p1 + m1; |
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return ct3 * t3 + ct2 * t2 + ct1 * t + ct0; |
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} |
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#endif /* AVFILTER_HERMITE_H */
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