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// ------------------------------------------------------------------------
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// Copyright (C) 2012 Fons Adriaensen <fons@linuxaudio.org>
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// Copyright (C) 2015 Robin Gareus <robin@areus.org>
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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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// 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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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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// ------------------------------------------------------------------------
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void processM (float *pl, float *pr, int n);
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void processS (float *pl, float *pr, int n);
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static void init (float fsamp);
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float _z1; // filter state
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float _z2; // filter state
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float _m; // max value since last read()
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bool _res; // flag to reset m
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float _mv; // dB offset m3, m6
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static float _w1; // attack filter coefficient
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static float _w2; // attack filter coefficient
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static float _w3; // release filter coefficient
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static float _g; // gain factor