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audio-math.h
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1 /******************************************************************************
2  Copyright (C) 2015 by Hugh Bailey <obs.jim@gmail.com>
3 
4  This program is free software: you can redistribute it and/or modify
5  it under the terms of the GNU General Public License as published by
6  the Free Software Foundation, either version 2 of the License, or
7  (at your option) any later version.
8 
9  This program is distributed in the hope that it will be useful,
10  but WITHOUT ANY WARRANTY; without even the implied warranty of
11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  GNU General Public License for more details.
13 
14  You should have received a copy of the GNU General Public License
15  along with this program. If not, see <http://www.gnu.org/licenses/>.
16 ******************************************************************************/
17 
18 #pragma once
19 
20 #include "../util/c99defs.h"
21 #include <math.h>
22 
23 #ifdef _MSC_VER
24 #include <float.h>
25 
26 #pragma warning(push)
27 #pragma warning(disable : 4056)
28 #pragma warning(disable : 4756)
29 #endif
30 
31 static inline float mul_to_db(const float mul)
32 {
33  return (mul == 0.0f) ? -INFINITY : (20.0f * log10f(mul));
34 }
35 
36 static inline float db_to_mul(const float db)
37 {
38  return isfinite((double)db) ? powf(10.0f, db / 20.0f) : 0.0f;
39 }
40 
41 #ifdef _MSC_VER
42 #pragma warning(pop)
43 #endif