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audioconvert: tweak the resampler a bit

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This commit is contained in:
Wim Taymans 2022-07-12 14:35:05 +02:00
parent 404d7e5ed1
commit ee84f96915
1 changed files with 23 additions and 19 deletions
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42
spa/plugins/audioconvert/resample-native.c
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@ -33,22 +33,22 @@ struct quality {
double cutoff; double cutoff;
}; };
static const struct quality blackman_qualities[] = { static const struct quality window_qualities[] = {
{ 8, 0.5, }, { 8, 0.53, },
{ 16, 0.70, }, { 16, 0.67, },
{ 24, 0.76, }, { 24, 0.75, },
{ 32, 0.8, }, { 32, 0.80, },
{ 48, 0.85, }, /* default */ { 48, 0.85, }, /* default */
{ 64, 0.90, }, { 64, 0.88, },
{ 80, 0.92, }, { 80, 0.895, },
{ 96, 0.933, }, { 96, 0.910, },
{ 128, 0.950, }, { 128, 0.936, },
{ 144, 0.955, }, { 144, 0.945, },
{ 160, 0.958, }, { 160, 0.950, },
{ 192, 0.965, }, { 192, 0.960, },
{ 256, 0.975, }, { 256, 0.970, },
{ 896, 0.997, }, { 896, 0.990, },
{ 1024, 0.998, }, { 1024, 0.995, },
}; };
static inline double sinc(double x) static inline double sinc(double x)
@ -69,9 +69,13 @@ static inline double window_blackman(double x, double n_taps)
static inline double window_cosh(double x, double n_taps) static inline double window_cosh(double x, double n_taps)
{ {
double R = 190.0, r; double R = 190.0, r;
double A = -325.1E-6 * (R * R) + 0.1677 * R - 3.149; double A = (-325.1E-6 * R + 0.1677) * R - 3.149;
double x2;
x = 2.0 * x / n_taps; x = 2.0 * x / n_taps;
r = cosh(A * sqrt(1 - pow(x, 2))) / cosh(A); x2 = x * x;
if (x2 >= 1.0)
return 0.0;
r = cosh(A * sqrt(1 - x2)) / cosh(A);
return r; return r;
} }
@ -356,7 +360,7 @@ int resample_native_init(struct resample *r)
uint32_t c, n_taps, n_phases, filter_size, in_rate, out_rate, gcd, filter_stride; uint32_t c, n_taps, n_phases, filter_size, in_rate, out_rate, gcd, filter_stride;
uint32_t history_stride, history_size, oversample; uint32_t history_stride, history_size, oversample;
r->quality = SPA_CLAMP(r->quality, 0, (int) SPA_N_ELEMENTS(blackman_qualities) - 1); r->quality = SPA_CLAMP(r->quality, 0, (int) SPA_N_ELEMENTS(window_qualities) - 1);
r->free = impl_native_free; r->free = impl_native_free;
r->update_rate = impl_native_update_rate; r->update_rate = impl_native_update_rate;
r->in_len = impl_native_in_len; r->in_len = impl_native_in_len;
@ -364,7 +368,7 @@ int resample_native_init(struct resample *r)
r->reset = impl_native_reset; r->reset = impl_native_reset;
r->delay = impl_native_delay; r->delay = impl_native_delay;
q = &blackman_qualities[r->quality]; q = &window_qualities[r->quality];
gcd = calc_gcd(r->i_rate, r->o_rate); gcd = calc_gcd(r->i_rate, r->o_rate);