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(Resampler) Cleanups

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This commit is contained in:
twinaphex 2020-02-03 01:59:24 +01:00
parent 5ceb73c1cf
commit e1603c0f44
1 changed files with 21 additions and 19 deletions
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40
libretro-common/audio/resampler/drivers/sinc_resampler.c
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@ -608,12 +608,13 @@ static void resampler_sinc_free(void *data)
static void sinc_init_table_kaiser(rarch_sinc_resampler_t *resamp,
double cutoff,
float *phase_table, int phases, int taps, bool calculate_delta)
void *phase_table, int phases, int taps, bool calculate_delta)
{
int i, j;
double window_mod = kaiser_window_function(0.0, resamp->kaiser_beta); /* Need to normalize w(0) to 1.0. */
int stride = calculate_delta ? 2 : 1;
double sidelobes = taps / 2.0;
float *phase_table_f = (float*)phase_table;
for (i = 0; i < phases; i++)
{
@ -627,22 +628,21 @@ static void sinc_init_table_kaiser(rarch_sinc_resampler_t *resamp,
sinc_phase = sidelobes * window_phase;
val = cutoff * sinc(M_PI * sinc_phase * cutoff) *
kaiser_window_function(window_phase, resamp->kaiser_beta) / window_mod;
phase_table[i * stride * taps + j] = val;
phase_table_f[i * stride * taps + j] = val;
}
}
if (calculate_delta)
{
int phase;
int p;
int phase, p;
for (p = 0; p < phases - 1; p++)
{
for (j = 0; j < taps; j++)
{
float delta = phase_table[(p + 1) * stride * taps + j] -
phase_table[p * stride * taps + j];
phase_table[(p * stride + 1) * taps + j] = delta;
float delta = phase_table_f[(p + 1) * stride * taps + j] -
phase_table_f[p * stride * taps + j];
phase_table_f[(p * stride + 1) * taps + j] = delta;
}
}
@ -658,19 +658,21 @@ static void sinc_init_table_kaiser(rarch_sinc_resampler_t *resamp,
val = cutoff * sinc(M_PI * sinc_phase * cutoff) *
kaiser_window_function(window_phase, resamp->kaiser_beta) / window_mod;
delta = (val - phase_table[phase * stride * taps + j]);
phase_table[(phase * stride + 1) * taps + j] = delta;
delta = (val - phase_table_f[phase * stride * taps + j]);
phase_table_f[(phase * stride + 1) * taps + j] = delta;
}
}
}
static void sinc_init_table_lanczos(rarch_sinc_resampler_t *resamp, double cutoff,
float *phase_table, int phases, int taps, bool calculate_delta)
static void sinc_init_table_lanczos(rarch_sinc_resampler_t *resamp,
double cutoff,
void *_phase_table, int phases, int taps, bool calculate_delta)
{
int i, j;
double window_mod = lanzcos_window_function(0.0); /* Need to normalize w(0) to 1.0. */
int stride = calculate_delta ? 2 : 1;
double sidelobes = taps / 2.0;
float *phase_table_f = (float*)_phase_table;
for (i = 0; i < phases; i++)
{
@ -684,7 +686,7 @@ static void sinc_init_table_lanczos(rarch_sinc_resampler_t *resamp, double cutof
sinc_phase = sidelobes * window_phase;
val = cutoff * sinc(M_PI * sinc_phase * cutoff) *
lanzcos_window_function(window_phase) / window_mod;
phase_table[i * stride * taps + j] = val;
phase_table_f[i * stride * taps + j] = val;
}
}
@ -697,9 +699,9 @@ static void sinc_init_table_lanczos(rarch_sinc_resampler_t *resamp, double cutof
{
for (j = 0; j < taps; j++)
{
float delta = phase_table[(p + 1) * stride * taps + j] -
phase_table[p * stride * taps + j];
phase_table[(p * stride + 1) * taps + j] = delta;
float delta = phase_table_f[(p + 1) * stride * taps + j] -
phase_table_f[p * stride * taps + j];
phase_table_f[(p * stride + 1) * taps + j] = delta;
}
}
@ -709,14 +711,14 @@ static void sinc_init_table_lanczos(rarch_sinc_resampler_t *resamp, double cutof
float val, delta;
double sinc_phase;
int n = j * phases + (phase + 1);
double window_phase = (double)n / (phases * taps); /* (0, 1]. */
window_phase = 2.0 * window_phase - 1.0; /* (-1, 1] */
double window_phase = (double)n / (phases * taps); /* ( 0, 1]. */
window_phase = 2.0 * window_phase - 1.0; /* (-1, 1] */
sinc_phase = sidelobes * window_phase;
val = cutoff * sinc(M_PI * sinc_phase * cutoff) *
lanzcos_window_function(window_phase) / window_mod;
delta = (val - phase_table[phase * stride * taps + j]);
phase_table[(phase * stride + 1) * taps + j] = delta;
delta = (val - phase_table_f[phase * stride * taps + j]);
phase_table_f[(phase * stride + 1) * taps + j] = delta;
}
}
}