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/* sc4pd
Decay2~, Decay2
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: AMM: AMMMusic 1966
*/
#include "sc4pd.hpp"
/* ------------------------ Decay2~ -----------------------------*/
class Decay2_ar
:public sc4pd_dsp
{
FLEXT_HEADER(Decay2_ar,sc4pd_dsp);
public:
Decay2_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_attack(float f);
void m_decay(float f);
private:
FLEXT_CALLBACK_F(m_decay);
FLEXT_CALLBACK_F(m_attack);
float m_attackTime, m_y1a, m_b1a, n_b1a;
float m_decayTime, m_y1b, m_b1b, n_b1b;
bool changed;
};
FLEXT_LIB_DSP_V("Decay2~",Decay2_ar);
Decay2_ar::Decay2_ar(int argc,t_atom * argv)
{
FLEXT_ADDMETHOD_(0,"decayTime",m_decay);
FLEXT_ADDMETHOD_(0,"attackTime",m_attack);
AtomList Args(argc,argv);
m_decayTime = sc_getfloatarg(Args,1); //decay
m_attackTime = sc_getfloatarg(Args,0);//attack
AddOutSignal();
m_y1a = m_y1b = 0.f; //different than in sc
}
void Decay2_ar::m_signal(int n, t_sample *const *in,
t_sample *const *out)
{
t_sample *nout = *out;
t_sample *nin = *in;
float y1a = m_y1a;
float y1b = m_y1b;
float b1a = m_b1a;
float b1b = m_b1b;
if(changed)
{
float b1a_slope = CALCSLOPE(n_b1a, b1a);
float b1b_slope = CALCSLOPE(n_b1b, b1b);
m_b1a = n_b1a;
m_b1b = n_b1b;
for (int i = 0; i!= n;++i)
{
float y0 = ZXP(nin);
y1a = y0 + b1a * y1a;
y1b = y0 + b1b * y1b;
ZXP (nout) = y1a - y1b;
b1a += b1a_slope;
b1b += b1b_slope;
}
changed = false;
}
else
{
for (int i = 0; i!= n;++i)
{
float y0 = ZXP(nin);
y1a = y0 + b1a * y1a;
y1b = y0 + b1b * y1b;
ZXP (nout) = y1a - y1b;
}
}
m_y1a = zapgremlins(y1a);
m_y1b = zapgremlins(y1b);
}
void Decay2_ar::m_decay(float f)
{
m_decayTime = f;
n_b1a = f == 0.f ? 0.f : exp(log001 / (f * Samplerate()));
changed = true;
}
void Decay2_ar::m_attack(float f)
{
m_attackTime = f;
n_b1b = f == 0.f ? 0.f : exp(log001 / (f * Samplerate()));
changed = true;
}
void Decay2_ar::m_dsp(int n, t_sample *const *in, t_sample *const *out)
{
m_b1a = m_decayTime == 0.f ? 0.f : exp(log001 /
(m_decayTime * Samplerate()));
m_b1b = m_attackTime == 0.f ? 0.f : exp(log001 /
(m_attackTime * Samplerate()));
changed = false;
}
/* todo: does it make sense to implement a message-based Decay2?
Probably not... */
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