made volume effect use decibels

io/math.cpp

@@ -52,3 +52,11 @@ double cubic_t_from_x(double x_target, double a, double b, double c, double d) {
 
 	return percent;
 }
+
+double amplitude_to_db(double amplitude) {
+    return (20.0*(qLn(amplitude)/qLn(10.0)));
+}
+
+double db_to_amplitude(double db) {
+    return qPow(M_E, (db*qLn(10.0))/20.0);
+}

io/math.h

@@ -10,4 +10,8 @@ double cubic_from_t(double a, double b, double c, double d, double t);
 double cubic_t_from_x(double x_target, double a, double b, double c, double d);
 double solveCubicBezier(double p0, double p1, double p2, double p3, double x);
 
+// decibel conversion functions
+double amplitude_to_db(double amplitude);
+double db_to_amplitude(double db);
+
 #endif // MATH_H

io/proxygenerator.h

@@ -15,8 +15,8 @@ struct ProxyInfo {
 	QString path;
 };
 
-class ProxyGenerator : public QThread
-{
+class ProxyGenerator : public QThread {
+    Q_OBJECT
 public:
 	ProxyGenerator();
 	void run();