#ifndef __ardour_dB_h__
#define __ardour_dB_h__
+#include <limits>
#include "pbd/fastlog.h"
-#define GAIN_COEFF_ZERO 0.0
-#define GAIN_COEFF_SMALL 0.0000001 //-140dB
-#define GAIN_COEFF_UNITY 1.0
+#define GAIN_COEFF_ZERO 0.f
+#define GAIN_COEFF_SMALL 0.0000001f //-140dB
+#define GAIN_COEFF_UNITY 1.f
static inline float dB_to_coefficient (float dB) {
return dB > -318.8f ? pow (10.0f, dB * 0.05f) : 0.0f;
}
static inline float accurate_coefficient_to_dB (float coeff) {
+ if (coeff < 1e-15) return -std::numeric_limits<float>::infinity();
return 20.0f * log10f (coeff);
}