decibel.h

#ifndef DECIBEL_H
#define DECIBEL_H
 
#include <cmath>
 
namespace xdsp::decibel {
 
constexpr double DB_REF = 1.0;
 
inline double to_linear(double db) { return pow(10.0, db / 20.0); }
 
inline float to_linear(float db) { return powf(10.0f, db / 20.0f); }
 
inline double to_linear_off(double db, double threshold) {
  if (db <= threshold) {
    return 0.0;
  } else {
    return to_linear(db);
  }
}
 
inline float to_linear_off(float db, double threshold) {
  if (db <= threshold) {
    return 0.0f;
  } else {
    return to_linear(db);
  }
}
 
inline double to_db(double linear) { return 20.0 * log10(linear); }
 
inline float to_db(float linear) { return 20.0f * log10f(linear); }
 
inline double apply(double lin, double gain) { return lin * to_linear(gain); }
 
inline float apply(float lin, float gain) { return lin * to_linear(gain); }
 
inline double apply_off(double lin, double gain, double threshold) {
  return lin * to_linear_off(gain, threshold);
}
 
inline float apply(float lin, float gain, float threshold) {
  return lin * to_linear_off(gain, threshold);
}
 
}  // namespace xdsp::decibel
 
#endif  // DECIBEL_H