92 lines
1.9 KiB
C++
92 lines
1.9 KiB
C++
/*
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* Copyright (C) 2012 Fons Adriaensen <fons@linuxaudio.org>
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* Copyright (C) 2013 Robin Gareus <robin@gareus.org>
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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 2 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <math.h>
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#include "ardour/vumeterdsp.h"
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float Vumeterdsp::_w;
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float Vumeterdsp::_g;
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Vumeterdsp::Vumeterdsp (void) :
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_z1 (0),
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_z2 (0),
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_m (0),
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_res (true)
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{
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}
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Vumeterdsp::~Vumeterdsp (void)
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{
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}
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void Vumeterdsp::process (float const *p, int n)
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{
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float z1, z2, m, t1, t2;
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z1 = _z1 > 20 ? 20 : (_z1 < -20 ? -20 : _z1);
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z2 = _z2 > 20 ? 20 : (_z2 < -20 ? -20 : _z2);
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m = _res ? 0: _m;
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_res = false;
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n /= 4;
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while (n--)
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{
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t2 = z2 / 2;
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t1 = fabsf (*p++) - t2;
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z1 += _w * (t1 - z1);
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t1 = fabsf (*p++) - t2;
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z1 += _w * (t1 - z1);
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t1 = fabsf (*p++) - t2;
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z1 += _w * (t1 - z1);
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t1 = fabsf (*p++) - t2;
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z1 += _w * (t1 - z1);
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z2 += 4 * _w * (z1 - z2);
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if (z2 > m) m = z2;
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}
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if (isnan(z1)) z1 = 0;
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if (isnan(z2)) z2 = 0;
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_z1 = z1;
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_z2 = z2 + 1e-10f;
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_m = m;
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}
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float Vumeterdsp::read (void)
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{
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_res = true;
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return _g * _m;
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}
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void Vumeterdsp::reset ()
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{
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_z1 = _z2 = _m = .0f;
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_res = true;
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}
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void Vumeterdsp::init (float fsamp)
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{
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_w = 11.1f / fsamp;
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_g = 1.5f * 1.571f;
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}
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