mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVFILTER_HERMITE_H
|
|
#define AVFILTER_HERMITE_H
|
|
|
|
static inline double hermite_interpolation(double x, double x0, double x1,
|
|
double p0, double p1,
|
|
double m0, double m1)
|
|
{
|
|
double width = x1 - x0;
|
|
double t = (x - x0) / width;
|
|
double t2, t3;
|
|
double ct0, ct1, ct2, ct3;
|
|
|
|
m0 *= width;
|
|
m1 *= width;
|
|
|
|
t2 = t*t;
|
|
t3 = t2*t;
|
|
ct0 = p0;
|
|
ct1 = m0;
|
|
|
|
ct2 = -3 * p0 - 2 * m0 + 3 * p1 - m1;
|
|
ct3 = 2 * p0 + m0 - 2 * p1 + m1;
|
|
|
|
return ct3 * t3 + ct2 * t2 + ct1 * t + ct0;
|
|
}
|
|
|
|
#endif /* AVFILTER_HERMITE_H */
|