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resample: use blackman with 0.232 alpha

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Gives much better results with less aliasing.
This commit is contained in:
Wim Taymans 2021-10-18 21:09:16 +02:00
parent 4c27c3fd43
commit cc996b6292
1 changed files with 5 additions and 3 deletions
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8
spa/plugins/audioconvert/resample-native.c
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@ -60,11 +60,13 @@ static inline double sinc(double x)
static inline double blackman(double x, double n_taps)
{
double w = 2.0 * x * M_PI / n_taps + M_PI;
return 0.3635819 - 0.4891775 * cos(w) +
0.1365995 * cos(2 * w) - 0.0106411 * cos(3 * w);
double alpha = 0.232;
x = 2.0 * M_PI * x / n_taps;
return (1.0 - alpha) / 2.0 + (1.0 / 2.0) * cos(x) +
(alpha / 2.0) * cos(2 * x);
}
static int build_filter(float *taps, uint32_t stride, uint32_t n_taps, uint32_t n_phases, double cutoff)
{
uint32_t i, j, n_taps12 = n_taps/2;