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vo_opengl: add ginseng upscaler

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This is a variation of ewa_lanczos that is sinc-windowed instead of
jinc-windowed. Results are pretty similar, but the logic is simpler.
This could potentially replace the ugly ewa_lanczos code.

It's hard to tell, but from comparing stills I think this one has
slightly less ringing than regular ewa_lanczos.
This commit is contained in:
Niklas Haas 2015-02-20 07:31:22 +01:00 committed by wm4
parent 4356e893a1
commit 885c2fff70
2 changed files with 12 additions and 1 deletions
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2
DOCS/man/vo.rst
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@ -337,7 +337,7 @@ Available video output drivers are:
Set radius for filters listed below, must be a float number between 1.0
and 16.0. Defaults to be 3.0 if not specified.
``sinc``, ``lanczos``, ``ewa_lanczos``, ``blackman``, ``gaussian``
``sinc``, ``lanczos``, ``ewa_lanczos``, ``ginseng``, ``blackman``, ``gaussian``
Note that depending on filter implementation details and video scaling
ratio, the radius that actually being used might be different

11
video/out/filter_kernels.c
View File

@ -294,6 +294,16 @@ static double lanczos(kernel *k, double x)
return radius * sin(pix) * sin(pix / radius) / (pix * pix);
}
static double ginseng(kernel *k, double x)
{
double radius = k->radius;
if (fabs(x) < 1e-8)
return 1.0;
if (fabs(x) >= radius)
return 0.0;
return jinc(k, x) * sinc(k, x / radius);
}
static double ewa_lanczos(kernel *k, double x)
{
double radius = k->radius;
@ -365,6 +375,7 @@ const struct filter_kernel mp_filter_kernels[] = {
{"gaussian", -1, gaussian, .params = {28.85390081777927, NAN} },
{"sinc", -1, sinc},
{"ewa_lanczos", -1, ewa_lanczos, .polar = true},
{"ginseng", -1, ginseng, .polar = true},
{"lanczos", -1, lanczos},
{"blackman", -1, blackman},
{0}