2 * Copyright (C) 2012 Fons Adriaensen <fons@linuxaudio.org>
3 * Copyright (C) 2013 Robin Gareus <robin@gareus.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include "ardour/vumeterdsp.h"
28 Vumeterdsp::Vumeterdsp (void) :
37 Vumeterdsp::~Vumeterdsp (void)
42 void Vumeterdsp::process (float const *p, int n)
44 float z1, z2, m, t1, t2;
46 z1 = _z1 > 20 ? 20 : (_z1 < -20 ? -20 : _z1);
47 z2 = _z2 > 20 ? 20 : (_z2 < -20 ? -20 : _z2);
55 t1 = fabsf (*p++) - t2;
57 t1 = fabsf (*p++) - t2;
59 t1 = fabsf (*p++) - t2;
61 t1 = fabsf (*p++) - t2;
63 z2 += 4 * _w * (z1 - z2);
67 if (isnan(z1)) z1 = 0;
68 if (isnan(z2)) z2 = 0;
75 float Vumeterdsp::read (void)
81 void Vumeterdsp::reset ()
87 void Vumeterdsp::init (float fsamp)