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Create kaiser_window_function/lanzcos_window_function

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twinaphex 2015-09-13 03:43:59 +02:00
parent c4d46ce09f
commit 7f9761afb6
2 changed files with 12 additions and 2 deletions
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4
audio/drivers_resampler/sinc.c
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@ -118,9 +118,9 @@ typedef struct rarch_sinc_resampler
} rarch_sinc_resampler_t;
#if defined(SINC_WINDOW_LANCZOS)
#define window_function(idx) (sinc(M_PI * (idx)))
#define window_function(idx) (lanzcos_window_function(idx))
#elif defined(SINC_WINDOW_KAISER)
#define window_function(idx) (besseli0(SINC_WINDOW_KAISER_BETA * sqrt(1 - (idx) * (idx))))
#define window_function(idx) (kaiser_window_function(idx, SINC_WINDOW_KAISER_BETA))
#else
#error "No SINC window function defined."
#endif

10
libretro-common/include/filters.h
View file

@ -60,4 +60,14 @@ static INLINE double besseli0(double x)
return sum;
}
static INLINE double kaiser_window_function(double index, double beta)
{
return besseli0(beta * sqrtf(1 - index * index));
}
static INLINE double lanzcos_window_function(double index)
{
return sinc(M_PI * index);
}
#endif