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vo_opengl: add spline64 filter kernel 

The coefficients are taken from fmtconv plugin for vapoursynth:
https://github.com/vapoursynth/fmtconv/blob/master/src/fmtc/ContFirSpline64.cpp

The package is licensed under WTFPL, and it's from the same author
of Dither plugin for avisynth.
This commit is contained in:
Bin Jin 2014-08-25 22:15:42 +02:00 committed by wm4
parent 3ec6705e34
commit a8b67c66f2
1 changed files with 19 additions and 0 deletions
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19
video/out/filter_kernels.c
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@ -9,6 +9,10 @@
* Also see glumpy (BSD licensed), contains the same code in Python:
* http://code.google.com/p/glumpy/source/browse/glumpy/image/filter.py
*
* Also see Vapoursynth plugin fmtconv (WTFPL Licensed), which is based on
* dither plugin for avisynth from the same author:
* https://github.com/vapoursynth/fmtconv/tree/master/src/fmtc
*
* Also see: Paul Heckbert's "zoom"
*
* Also see XBMC: ConvolutionKernels.cpp etc.
@ -222,6 +226,20 @@ static double spline36(kernel *k, double x)
* (x - 2);
}
static double spline64(kernel *k, double x)
{
if (x < 1.0)
return ((49.0 / 41.0 * x - 6387.0 / 2911.0) * x - 3.0 / 2911.0) * x + 1.0;
if (x < 2.0)
return ((-24.0 / 41.0 * (x - 1) + 4032.0 / 2911.0) * (x - 1) - 2328.0 / 2911.0)
* (x - 1);
if (x < 3.0)
return ((6.0 / 41.0 * (x - 2) - 1008.0 / 2911.0) * (x - 2) + 582.0 / 2911.0)
* (x - 2);
return ((-1.0 / 41.0 * (x - 3) + 168.0 / 2911.0) * (x - 3) - 97.0 / 2911.0)
* (x - 3);
}
static double gaussian(kernel *k, double x)
{
return exp(-2.0 * x * x) * sqrt(2.0 / M_PI);
@ -271,6 +289,7 @@ const struct filter_kernel mp_filter_kernels[] = {
{"mitchell", 2, mitchell, .params = {1.0/3.0, 1.0/3.0} },
{"spline16", 2, spline16},
{"spline36", 3, spline36},
{"spline64", 4, spline64},
{"gaussian", 2, gaussian},
{"sinc2", 2, sinc},
{"sinc3", 3, sinc},