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// -----------------------------------------------------------------------
//
// Copyright (C) 2009-2014 Fons Adriaensen <fons@linuxaudio.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 <string.h>
#include "autowah.h"
void Ladspa_Autowah::setport (unsigned long port, LADSPA_Data *data)
{
_port [port] = data;
}
#define G_RES 4.0f
#define F_MIN 300.0f
#define F_RAT 10
#define B_MIN 0.03f
#define B_RAT 4
#define T_MIN 0.05f
#define T_LOG 2
void Ladspa_Autowah::active (bool act)
{
if (! act) return;
_wbase = F_MIN * 6.28f / _fsam;
_bbase = B_MIN;
_rfact = 64.0f / (_fsam * T_MIN);
_z1 = _z2 = 0;
_s1 = _s2 = 0;
_gx = _gy = 0;
_dr = 0;
}
void Ladspa_Autowah::runproc (unsigned long len, bool add)
{
int i, k;
float *inp = _port [A_INP];
float *out = _port [A_OUT];
float z1, z2, s1, s2, gx, gy;
float ds1, ds2, dgx, dgy;
float gd, rf, md, fr, dr;
float b, p, t, w, x, y;
gx = _gx;
gy = _gy;
t = _port [C_OPMIX][0];
_gy = G_RES * t;
_gx = _gy + 1 - t;
dgx = (_gx - gx) / len;
dgy = (_gy - gy) / len;
gd = 10 * powf (10.0f, 0.05f * _port [C_DRIVE][0]);
rf = 1.0f - _rfact / powf (10.0f, T_LOG * _port [C_DECAY][0]);
md = _port [C_RANGE][0];
fr = _port [C_FREQ][0];
z1 = _z1;
z2 = _z2;
s1 = _s1;
s2 = _s2;
dr = _dr;
while (len)
{
k = (len > 80) ? 64 : len;
p = 0;
for (i = 0; i < k; i++)
{
x = inp [i];
p += x * x;
}
p = gd * sqrtf (p / k);
if (p > dr) dr += 0.1f * (p - dr);
if (dr > md) dr = md;
t = dr + fr;
dr = dr * rf + 1e-10f;
w = _wbase * (1 + (F_RAT - 1) * t * t);
b = w * _bbase * (1 + (B_RAT - 1) * t);
if (w > 0.7f) w = 0.7f;
_s1 = -cosf (w);
_s2 = (1 - b) / (1 + b);
ds1 = (_s1 - s1) / k;
ds2 = (_s2 - s2) / k;
for (i = 0; i < k; i++)
{
s1 += ds1;
s2 += ds2;
gx += dgx;
gy += dgy;
x = inp [i];
y = x - s2 * z2;
out [i] = gx * x - gy * (z2 + s2 * y);
y -= s1 * z1;
z2 = z1 + s1 * y;
z1 = y + 1e-10f;
}
inp += k;
out += k;
len -= k;
}
_z1 = z1;
_z2 = z2;
_dr = dr;
}
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