Add decibel selection to audio condition

plugins/base/utils/audio-helpers.cpp

@@ -1,6 +1,7 @@
 #include "audio-helpers.hpp"
 #include "obs-module-helper.hpp"
 
+#include <cmath>
 #include <obs.hpp>
 
 namespace advss {
@@ -13,4 +14,14 @@ void PopulateMonitorTypeSelection(QComboBox *list)
 	list->addItem(obs_module_text("AdvSceneSwitcher.audio.monitor.both"));
 }
 
+float DecibelToPercent(float db)
+{
+	return isfinite((double)db) ? powf(10.0f, db / 20.0f) : 0.0f;
+}
+
+float PercentToDecibel(float percent)
+{
+	return (percent == 0.0f) ? -INFINITY : (20.0f * log10f(percent));
+}
+
 } // namespace advss