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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include <algorithm>
#ifndef M_PI
#define M_PI (3.14159265358979323846)
#endif
extern double db_to_linear(double db);
extern double linear_to_db(double linear);
/** @return linear gain according to a logarithmic curve, for fading in.
* t < 0: linear gain of 0
* 0 >= t >= 1: logarithmic fade in curve
* t > 1: linear gain of 1
*/
extern float logarithmic_fade_in_curve(float t);
/** @return linear gain according to a logarithmic curve, for fading out.
* t > 1: linear gain of 0
* 0 >= t >= 1: logarithmic fade out curve
* t < 0: linear gain of 1
*/
extern float logarithmic_fade_out_curve(float t);
template <class T>
T clamp(T val, T minimum, T maximum)
{
return std::max(std::min(val, maximum), minimum);
}
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