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libobs/media-io: Add common audio math functions 

This adds functions specific to audio math, which at the moment is just
converting to and from decibel and multiple.
master
jp9000 2015-06-26 03:08:00 -07:00
parent 204d5f30ce
commit c82da7da93
2 changed files with 44 additions and 0 deletions
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1
libobs/CMakeLists.txt
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@ -180,6 +180,7 @@ set(libobs_mediaio_HEADERS
media-io/media-io-defs.h
media-io/video-io.h
media-io/audio-io.h
media-io/audio-math.h
media-io/video-frame.h
media-io/format-conversion.h
media-io/audio-resampler.h

43
libobs/media-io/audio-math.h Normal file
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@ -0,0 +1,43 @@
/******************************************************************************
Copyright (C) 2015 by Hugh Bailey <obs.jim@gmail.com>
This program 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.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
#pragma once
#include "../util/c99defs.h"
#include <math.h>
#ifdef _MSC_VER
#include <float.h>
#pragma warning(push)
#pragma warning(disable : 4056)
#pragma warning(disable : 4756)
#endif
static inline float mul_to_db(const float mul)
{
return (mul == 0.0f) ? -INFINITY : (20.0f * log10f(mul));
}
static inline float db_to_mul(const float db)
{
return isfinite((double)db) ? powf(10.0f, db / 20.0f) : 0.0f;
}
#ifdef _MSC_VER
#pragma warning(pop)
#endif