1 #ifndef __ardour_gtk_log_meter_h__
2 #define __ardour_gtk_log_meter_h__
6 _log_meter (float power, double lower_db, double upper_db, double non_linearity)
8 return (power < lower_db ? 0.0 : pow((power-lower_db)/(upper_db-lower_db), non_linearity));
12 log_meter (float power)
14 return _log_meter (power, -192.0, 0.0, 8.0);
21 gfloat def = 0.0f; /* Meter deflection %age */
25 } else if (db < -60.0f) {
26 def = (db + 70.0f) * 0.25f;
27 } else if (db < -50.0f) {
28 def = (db + 60.0f) * 0.5f + 2.5f;
29 } else if (db < -40.0f) {
30 def = (db + 50.0f) * 0.75f + 7.5f;
31 } else if (db < -30.0f) {
32 def = (db + 40.0f) * 1.5f + 15.0f;
33 } else if (db < -20.0f) {
34 def = (db + 30.0f) * 2.0f + 30.0f;
35 } else if (db < 6.0f) {
36 def = (db + 20.0f) * 2.5f + 50.0f;
41 /* 115 is the deflection %age that would be
42 when db=6.0. this is an arbitrary
43 endpoint for our scaling.
49 #endif /* __ardour_gtk_log_meter_h__ */