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Improvement: approximation of math functions

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Antoine SOULIER
2022-04-20 14:55:46 +02:00
parent ddc6522790
commit 279da7b6d2
6 changed files with 210 additions and 8 deletions
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4
src/sns.c
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@@ -285,7 +285,7 @@ static void compute_scale_factors(enum lc3_dt dt, enum lc3_srate sr,
float noise_floor = fmaxf(e_sum * (1e-4f / 64), 0x1p-32f);
for (int i = 0; i < LC3_NUM_BANDS; i++)
e[i] = log2f(fmaxf(e[i], noise_floor)) * 0.5f;
e[i] = fast_log2f(fmaxf(e[i], noise_floor)) * 0.5f;
/* --- Grouping & scaling --- */
@@ -706,7 +706,7 @@ static void spectral_shaping(enum lc3_dt dt, enum lc3_srate sr,
const int *lim = lc3_band_lim[dt][sr];
for (int i = 0, ib = 0; ib < nb; ib++) {
float g_sns = powf(2, -scf[ib]);
float g_sns = fast_exp2f(-scf[ib]);
for ( ; i < lim[ib+1]; i++)
y[i] = x[i] * g_sns;