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Copyright (C) 2008-2011 Fons Adriaensen <fons@linuxaudio.org>
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Adopted for Ardour 2013 by Robin Gareus <robin@gareus.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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void process (float *p, int n);
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static void init (int fsamp);
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float _z1; // filter state
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float _z2; // filter state
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float _rms; // max rms value since last read()
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bool _flag; // flag set by read(), resets _rms
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static float _omega; // ballistics filter constant.