43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
/*
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* Copyright 2003-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "ReplayGainInfo.hxx"
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#include "ReplayGainConfig.hxx"
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#include <cmath>
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float
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ReplayGainTuple::CalculateScale(const ReplayGainConfig &config) const noexcept
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{
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float scale;
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if (IsDefined()) {
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scale = std::pow(10.0f, gain / 20.0f);
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scale *= config.preamp;
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if (scale > 15.0f)
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scale = 15.0f;
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if (config.limit && scale * peak > 1.0f)
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scale = 1.0f / peak;
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} else
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scale = config.missing_preamp;
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return scale;
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}
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