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third_party/libspecbleach/src/shared/utils/general_utils.c

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+/*
+libspecbleach - A spectral processing library
+
+Copyright 2022 Luciano Dato <lucianodato@gmail.com>
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "general_utils.h"
+#include <float.h>
+#include <math.h>
+#include <stdlib.h>
+
+float sanitize_denormal(float value) {
+  if (!isnormal(value)) {
+    value = 0.F;
+  }
+  return value;
+}
+
+float from_db_to_coefficient(const float value_db) {
+  return expf(value_db / 20.F * logf(10.F));
+}
+
+float remap_percentage_log_like_unity(const float value) {
+  return 1.F - expf(-3.F * (value));
+}
+
+int get_next_divisible_two(int number) {
+  int q = number / 2;
+  int n1 = 2 * q;
+  int n2 = (number * 2) > 0 ? (2 * (q + 1)) : (2 * (q - 1));
+  if (abs(number - n1) < abs(number - n2)) {
+    return n1;
+  }
+
+  return n2;
+}
+
+int get_next_power_two(int number) {
+  return (int)roundf(powf(2.F, ceilf(log2f((float)number))));
+}