94 lines
2.0 KiB
C++
94 lines
2.0 KiB
C++
/*
|
|
* Copyright (C) 2012 Fons Adriaensen <fons@linuxaudio.org>
|
|
* Copyright (C) 2013-2019 Robin Gareus <robin@gareus.org>
|
|
*
|
|
* 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include "ardour/iec1ppmdsp.h"
|
|
|
|
float Iec1ppmdsp::_w1;
|
|
float Iec1ppmdsp::_w2;
|
|
float Iec1ppmdsp::_w3;
|
|
float Iec1ppmdsp::_g;
|
|
|
|
Iec1ppmdsp::Iec1ppmdsp (void)
|
|
: _z1 (0)
|
|
, _z2 (0)
|
|
, _m (0)
|
|
, _res (true)
|
|
{}
|
|
|
|
Iec1ppmdsp::~Iec1ppmdsp (void) {}
|
|
|
|
void
|
|
Iec1ppmdsp::process (float const* p, int n)
|
|
{
|
|
float z1, z2, m, t;
|
|
|
|
z1 = _z1 > 20 ? 20 : (_z1 < 0 ? 0 : _z1);
|
|
z2 = _z2 > 20 ? 20 : (_z2 < 0 ? 0 : _z2);
|
|
m = _res ? 0: _m;
|
|
_res = false;
|
|
|
|
n /= 4;
|
|
while (n--) {
|
|
z1 *= _w3;
|
|
z2 *= _w3;
|
|
t = fabsf (*p++);
|
|
if (t > z1) z1 += _w1 * (t - z1);
|
|
if (t > z2) z2 += _w2 * (t - z2);
|
|
t = fabsf (*p++);
|
|
if (t > z1) z1 += _w1 * (t - z1);
|
|
if (t > z2) z2 += _w2 * (t - z2);
|
|
t = fabsf (*p++);
|
|
if (t > z1) z1 += _w1 * (t - z1);
|
|
if (t > z2) z2 += _w2 * (t - z2);
|
|
t = fabsf (*p++);
|
|
if (t > z1) z1 += _w1 * (t - z1);
|
|
if (t > z2) z2 += _w2 * (t - z2);
|
|
t = z1 + z2;
|
|
if (t > m) m = t;
|
|
}
|
|
|
|
_z1 = z1 + 1e-10f;
|
|
_z2 = z2 + 1e-10f;
|
|
_m = m;
|
|
}
|
|
|
|
float
|
|
Iec1ppmdsp::read (void)
|
|
{
|
|
_res = true;
|
|
return _g * _m;
|
|
}
|
|
|
|
void
|
|
Iec1ppmdsp::reset ()
|
|
{
|
|
_z1 = _z2 = _m = .0f;
|
|
_res = true;
|
|
}
|
|
|
|
void
|
|
Iec1ppmdsp::init (float fsamp)
|
|
{
|
|
_w1 = 450.0f / fsamp;
|
|
_w2 = 1300.0f / fsamp;
|
|
_w3 = 1.0f - 5.4f / fsamp;
|
|
_g = 0.5108f;
|
|
}
|