blob: 7fb3b74eeb1034dc7b3d7aad65c19942cf6db21c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
/*
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 "maths_util.h"
#include <cmath>
double
db_to_linear(double db)
{
return pow(10, db / 20);
}
double
linear_to_db(double linear)
{
return 20 * log10(linear);
}
float
logarithmic_fade_in_curve(float t)
{
auto const c = clamp(t, 0.0f, 1.0f);
return std::exp(2 * (c - 1)) * c;
}
float
logarithmic_fade_out_curve(float t)
{
auto const c = clamp(t, 0.0f, 1.0f);
return std::exp(-2 * c) * (1 - c);
}
|
