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filter_kernels: add bartlett, blackman and welch windows

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This commit is contained in:
Niklas Haas 2015-03-27 06:36:27 +01:00
parent 068ff812e4
commit 13efec228b
1 changed files with 17 additions and 1 deletions
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18
video/out/filter_kernels.c
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@ -225,6 +225,19 @@ static double kaiser(params *p, double x)
return bessel_i0(epsilon, a * sqrt(1 - x * x)) * i0a; return bessel_i0(epsilon, a * sqrt(1 - x * x)) * i0a;
} }
static double blackman(params *p, double x)
{
double a = p->params[0];
double a0 = (1-a)/2.0, a1 = 1/2.0, a2 = a/2.0;
double pix = M_PI * x;
return a0 + a1*cos(pix) + a2*cos(2 * pix);
}
static double welch(params *p, double x)
{
return 1.0 - x*x;
}
// Family of cubic B/C splines // Family of cubic B/C splines
static double cubic_bc(params *p, double x) static double cubic_bc(params *p, double x)
{ {
@ -309,12 +322,15 @@ static double sphinx(params *p, double x)
const struct filter_window mp_filter_windows[] = { const struct filter_window mp_filter_windows[] = {
{"box", 1, box}, {"box", 1, box},
{"triangle", 1, triangle}, {"triangle", 1, triangle},
{"bartlett", 1, triangle},
{"hanning", 1, hanning}, {"hanning", 1, hanning},
{"hamming", 1, hamming}, {"hamming", 1, hamming},
{"quadric", 1.5, quadric}, {"quadric", 1.5, quadric},
{"welch", 1, welch},
{"kaiser", 1, kaiser, .params = {6.33, NAN} }, {"kaiser", 1, kaiser, .params = {6.33, NAN} },
{"hermite", 1, cubic_bc, .params = {0.0, 0.0} }, {"hermite", 1, cubic_bc, .params = {0.0, 0.0} },
{"gaussian", 2, gaussian, .params = {1.0, NAN} }, {"blackman", 1, blackman, .params = {0.16, NAN} },
{"gaussian", 2, gaussian, .params = {1.0, NAN} },
{"sinc", 1, sinc}, {"sinc", 1, sinc},
{"jinc", 1.2196698912665045, jinc}, {"jinc", 1.2196698912665045, jinc},
{"sphinx", 1.4302966531242027, sphinx}, {"sphinx", 1.4302966531242027, sphinx},