latest SDK

foobar2000/helpers/VolumeMap.cpp

@@ -0,0 +1,22 @@
+#include "stdafx.h"
+#include "VolumeMap.h"
+
+static const double powval = 2.0;
+static const double silence = -100.0;
+
+double VolumeMap::SliderToDB2(double slider) {
+	double v = SliderToDB(slider);
+	v = floor(v * 2.0 + 0.5) * 0.5;
+	return v;
+}
+
+double VolumeMap::SliderToDB(double slider) {
+	if (slider > 0) {
+		return pfc::max_t<double>(silence,10.0 * log(slider) / log(powval));
+	} else {
+		return silence;
+	}
+}
+double VolumeMap::DBToSlider(double volumeDB) {
+	return pfc::clip_t<double>(pow(powval,volumeDB / 10.0), 0, 1);
+}