67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
/*
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* Author: Harry van Haaren 2013
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* harryhaaren@gmail.com
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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 3 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OPENAV_DSP_SIDECHAIN_GAIN_H
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#define OPENAV_DSP_SIDECHAIN_GAIN_H
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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class SidechainGain
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{
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public:
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SidechainGain(int rate);
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~SidechainGain(){}
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void threshold(float t){controlThreshold = t;}
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void reduction(float r){controlReduction = r;}
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void time (float t){controlReleaseTime = t;}
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void process(unsigned int n_samples, float** inputs, float** outputs);
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private:
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/// audio buffers
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float* audioInputL;
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float* audioInputR;
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float* audioSidechain;
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float* audioOutputL;
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float* audioOutputR;
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/// control signals
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float controlThreshold;
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float controlReduction;
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float controlReleaseTime;
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float controlSidechainAmp;
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/// filter state
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float w, a, b, g1, g2;
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/// last peak history
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bool nowIsAPeak;
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long peakFrameCounter;
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/// nframes available for countdown
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long peakCountDuration;
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/// control output
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float currentTarget;
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};
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#endif // OPENAV_DSP_SIDECHAIN_GAIN_H
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