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/* sc4pd
Lag~, Lag
Copyright (c) 2004 Tim Blechmann.
This code is derived from:
SuperCollider real time audio synthesis system
Copyright (c) 2002 James McCartney. All rights reserved.
http://www.audiosynth.com
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Based on:
PureData by Miller Puckette and others.
http://www.crca.ucsd.edu/~msp/software.html
FLEXT by Thomas Grill
http://www.parasitaere-kapazitaeten.net/ext
SuperCollider by James McCartney
http://www.audiosynth.com
Coded while listening to: VA: Live from the Vision Festival
*/
#include "sc4pd.hpp"
/* ------------------------ Lag~ -----------------------------*/
class Lag_ar
:public sc4pd_dsp
{
FLEXT_HEADER(Lag_ar,sc4pd_dsp);
public:
Lag_ar(int argc,t_atom * argv);
protected:
virtual void m_signal(int n, t_sample *const *in, t_sample *const *out);
virtual void m_dsp(int n, t_sample *const *in, t_sample *const *out);
void m_set(float f);
private:
FLEXT_CALLBACK_F(m_set);
float m_b1, n_b1;
float m_y1;
float m_lag;
bool changed;
};
FLEXT_LIB_DSP_V("Lag~",Lag_ar);
Lag_ar::Lag_ar(int argc,t_atom * argv)
{
FLEXT_ADDMETHOD_(0,"lagTime",m_set);
AtomList Args(argc,argv);
m_lag = sc_getfloatarg(Args,0);
AddOutSignal();
m_y1 = 0.f;
}
void Lag_ar::m_dsp(int n, t_sample *const *in,
t_sample *const *out)
{
changed = false;
m_b1 = m_lag == 0.f ? 0.f : exp(log001 / (m_lag * Samplerate()));
}
void Lag_ar::m_signal(int n, t_sample *const *in,
t_sample *const *out)
{
t_sample *nout = *out;
t_sample *nin = *in;
float y1 = m_y1;
float b1 = m_b1;
if (changed)
{
float b1_slope = CALCSLOPE(m_b1, n_b1);
m_b1 = n_b1;
for (int i = 0; i!= n;++i)
{
float y0 = ZXP(nin);
ZXP(nout) = y1 = y0 + b1 * (y1 - y0);
b1 += b1_slope;
}
changed = false;
}
else
{
for (int i = 0; i!= n;++i)
{
float y0 = ZXP(nin);
ZXP(nout) = y1 = y0 + b1 * (y1 - y0);
}
}
m_y1 = zapgremlins(y1);
}
void Lag_ar::m_set(float f)
{
m_lag = f;
n_b1 = m_lag == 0.f ? 0.f : exp(log001 / (m_lag * Samplerate()));
changed = true;
}
/* todo: does a control rate Lag make sense? */
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