mirror of https://github.com/ShaYmez/xlxd.git
53 lines
1.8 KiB
C++
53 lines
1.8 KiB
C++
//
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// cfixedgain.cpp
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// ambed
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//
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// Created by Jean-Luc Deltombe (LX3JL) on 28/04/2017.
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// Copyright © 2015 Jean-Luc Deltombe (LX3JL). All rights reserved.
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//
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// ----------------------------------------------------------------------------
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// This file is part of ambed.
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//
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// xlxd 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 3 of the License, or
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// (at your option) any later version.
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//
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// xlxd 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
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// along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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// ----------------------------------------------------------------------------
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// Geoffrey Merck F4FXL / KC3FRA AGC
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#include "cfixedgain.h"
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#include <math.h>
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////////////////////////////////////////////////////////////////////////////////////////
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// constructor
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CFixedGain::CFixedGain(float gaindB)
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{
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m_gaindB = gaindB;
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m_gainLinear = pow(10.0f, m_gaindB/20.0f);
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}
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////////////////////////////////////////////////////////////////////////////////////////
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// processing
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inline void CFixedGain::ProcessSampleBlock(uint8* voice, int length)
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{
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for(int i = 0; i < length; i += 2)
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{
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float input = (float)(short)MAKEWORD(voice[i+1], voice[i]);
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//apply gain
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float output = input * m_gainLinear;
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//write processed sample back
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voice[i] = HIBYTE((short)output);
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voice[i+1] = LOBYTE((short)output);
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}
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} |