Add decibel to gain converters

libs/audio/include/psemek/audio/constants.hpp

@@ -19,4 +19,14 @@ namespace psemek::audio
 		return static_cast<float>(samples) * 0.5f * inv_frequency;
 	}
 
+	inline float to_db(float amplitude)
+	{
+		return 10.f * std::log10(amplitude);
+	}
+
+	inline float from_db(float db)
+	{
+		return std::pow(10.f, db / 10.f);
+	}
+
 }