101 lines
2.1 KiB
C++
101 lines
2.1 KiB
C++
/*
|
|
Copyright (C) 2012 Fons Adriaensen <fons@linuxaudio.org>
|
|
Adopted for Ardour 2013 by 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <math.h>
|
|
#include "ardour/iec2ppmdsp.h"
|
|
|
|
|
|
float Iec2ppmdsp::_w1;
|
|
float Iec2ppmdsp::_w2;
|
|
float Iec2ppmdsp::_w3;
|
|
float Iec2ppmdsp::_g;
|
|
|
|
|
|
Iec2ppmdsp::Iec2ppmdsp (void) :
|
|
_z1 (0),
|
|
_z2 (0),
|
|
_m (0),
|
|
_res (true)
|
|
{
|
|
}
|
|
|
|
|
|
Iec2ppmdsp::~Iec2ppmdsp (void)
|
|
{
|
|
}
|
|
|
|
|
|
void Iec2ppmdsp::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 Iec2ppmdsp::read (void)
|
|
{
|
|
_res = true;
|
|
return _g * _m;
|
|
}
|
|
|
|
void Iec2ppmdsp::reset ()
|
|
{
|
|
_z1 = _z2 = _m = .0f;
|
|
_res = true;
|
|
}
|
|
|
|
void Iec2ppmdsp::init (float fsamp)
|
|
{
|
|
_w1 = 200.0f / fsamp;
|
|
_w2 = 860.0f / fsamp;
|
|
_w3 = 1.0f - 4.0f / fsamp;
|
|
_g = 0.5141f;
|
|
}
|
|
|
|
/* vi:set ts=8 sts=8 sw=4: */
|