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// -----------------------------------------------------------------------
//
// Copyright (C) 2010 Fons Adriaensen <fons@kokkinizita.net>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// -----------------------------------------------------------------------
#include <math.h>
#include "vumdetect.h"
int VUMdetect::init (int fsamp)
{
reset ();
_slow = false;
_w = 10.6f / fsamp;
return 0;
}
void VUMdetect::reset (void)
{
_z1 = _z2 = 0;
}
void VUMdetect::process (int n, const float *inp)
{
float w, x, z1, z2;
w = _slow ? (0.1f * _w) : _w;
z1 = _z1 + 1e-30f;
z2 = _z2;
while (n--)
{
x = fabsf (*inp++) - 0.55f * z2;
z1 += w * (x - z1);
z2 += w * (z1 - z2);
}
if (z2 < 0) z2 = 0;
_z1 = z1 - 1e-30f;
_z2 = z2;
}
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