94 lines
2.0 KiB
C++
94 lines
2.0 KiB
C++
/*
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* Copyright (C) 2012 Fons Adriaensen <fons@linuxaudio.org>
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* Copyright (C) 2013-2019 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/iec2ppmdsp.h"
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float Iec2ppmdsp::_w1;
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float Iec2ppmdsp::_w2;
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float Iec2ppmdsp::_w3;
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float Iec2ppmdsp::_g;
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Iec2ppmdsp::Iec2ppmdsp (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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Iec2ppmdsp::~Iec2ppmdsp (void) {}
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void
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Iec2ppmdsp::process (float const* p, int n)
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{
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float z1, z2, m, t;
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z1 = _z1 > 20 ? 20 : (_z1 < 0 ? 0 : _z1);
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z2 = _z2 > 20 ? 20 : (_z2 < 0 ? 0 : _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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z1 *= _w3;
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z2 *= _w3;
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t = fabsf (*p++);
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if (t > z1) z1 += _w1 * (t - z1);
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if (t > z2) z2 += _w2 * (t - z2);
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t = fabsf (*p++);
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if (t > z1) z1 += _w1 * (t - z1);
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if (t > z2) z2 += _w2 * (t - z2);
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t = fabsf (*p++);
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if (t > z1) z1 += _w1 * (t - z1);
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if (t > z2) z2 += _w2 * (t - z2);
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t = fabsf (*p++);
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if (t > z1) z1 += _w1 * (t - z1);
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if (t > z2) z2 += _w2 * (t - z2);
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t = z1 + z2;
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if (t > m) m = t;
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}
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_z1 = z1 + 1e-10f;
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_z2 = z2 + 1e-10f;
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_m = m;
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}
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float
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Iec2ppmdsp::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
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Iec2ppmdsp::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
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Iec2ppmdsp::init (float fsamp)
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{
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_w1 = 200.0f / fsamp;
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_w2 = 860.0f / fsamp;
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_w3 = 1.0f - 4.0f / fsamp;
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_g = 0.5141f;
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}
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