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+/* sc4pd
+ AllpassL~
+
+ 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: Rashid Ali & Frank Lowe: Duo Exchange
+
+*/
+
+#include "sc4pd.hpp"
+#include "DelayUnit.hpp"
+
+class AllpassL_ar : public FeedbackDelay_ar
+{
+ FLEXT_HEADER(AllpassL_ar,FeedbackDelay_ar);
+
+ AllpassL_ar (int argc, t_atom *argv);
+ ~AllpassL_ar ();
+
+protected:
+ virtual void m_signal(int n, t_sample *const *in, t_sample *const *out)
+ {
+ m_signal_fun(n,in,out);
+ }
+
+ virtual void m_dsp(int n, t_sample *const *in, t_sample *const *out)
+ {
+ delay_changed = decay_changed = false;
+ FeedbackDelay_Reset();
+ }
+
+ void m_delay(float f)
+ {
+ m_delaytime=f;
+ delay_changed = true;
+ }
+
+ void m_decay(float f)
+ {
+ m_decaytime=f;
+ decay_changed = true;
+ }
+
+private:
+ bool delay_changed, decay_changed;
+ DEFSIGCALL(m_signal_fun);
+ DEFSIGFUN(m_signal_);
+ DEFSIGFUN(m_signal_z);
+
+ FLEXT_CALLBACK_F(m_delay);
+ FLEXT_CALLBACK_F(m_decay);
+};
+
+FLEXT_LIB_DSP_V("AllpassL~",AllpassL_ar);
+
+AllpassL_ar::AllpassL_ar (int argc, t_atom *argv)
+{
+ FLEXT_ADDMETHOD_(0,"delaytime",m_delay);
+ FLEXT_ADDMETHOD_(0,"decaytime",m_decay);
+
+ //parse arguments
+ AtomList Args(argc,argv);
+
+ if (Args.Count() != 3)
+ {
+ post("3 arguments are needed");
+ return;
+ }
+
+ m_maxdelaytime = sc_getfloatarg(Args,0);
+ m_delaytime = sc_getfloatarg(Args,1);
+ m_decaytime = sc_getfloatarg(Args,2);
+
+ SETSIGFUN(m_signal_fun,SIGFUN(m_signal_z));
+
+ AddOutSignal();
+}
+
+AllpassL_ar::~AllpassL_ar ()
+{
+ DelayUnit_Dtor();
+}
+
+void AllpassL_ar::m_signal_z(int n, t_sample *const *in, t_sample *const *out)
+{
+ t_sample *nin = *in;
+ t_sample *nout = *out;
+
+ float *dlybuf = m_dlybuf;
+ long iwrphase = m_iwrphase;
+ float dsamp = m_dsamp;
+ float feedbk = m_feedbk;
+ long mask = m_mask;
+
+ if (delay_changed || decay_changed)
+ {
+ float next_dsamp = CalcDelay(m_delaytime);
+ float dsamp_slope = CALCSLOPE(next_dsamp, dsamp);
+
+ float next_feedbk = CalcFeedback(m_delaytime, m_decaytime);
+ float feedbk_slope = CALCSLOPE(next_feedbk, feedbk);
+
+ for (int i = 0; i!= n;++i)
+ {
+ dsamp += dsamp_slope;
+ long idsamp = (long)dsamp;
+ float frac = dsamp - idsamp;
+ long irdphase = iwrphase - idsamp;
+ long irdphaseb = irdphase - 1;
+
+ float zin = ZXP(nin);
+ if (irdphase < 0)
+ {
+ dlybuf[iwrphase & mask] = zin;
+ ZXP(nout) = - feedbk * zin; //check: probably a bug = 0?
+ }
+ else if (irdphaseb < 0)
+ {
+ float d1 = dlybuf[irdphase & mask];
+ float value = d1 - frac * d1;
+ float dwr = zin + feedbk * value;
+ dlybuf[iwrphase & mask] = dwr;
+ ZXP(nout) = value - feedbk * dwr;
+ }
+ else
+ {
+ float d1 = dlybuf[irdphase & mask];
+ float d2 = dlybuf[irdphaseb & mask];
+ float value = lininterp(frac, d1, d2);
+ float dwr = zin + feedbk * value;
+ dlybuf[iwrphase & mask] = dwr;
+ ZXP(nout) = value - feedbk * dwr;
+ }
+
+ feedbk += feedbk_slope;
+ iwrphase++;
+ }
+ m_feedbk = feedbk;
+ m_dsamp = dsamp;
+ delay_changed = decay_changed = false;
+ }
+ else
+ {
+ long idsamp = (long)dsamp;
+ float frac = dsamp - idsamp;
+
+ float zin = ZXP(nin);
+ for (int i = 0; i!= n;++i)
+ {
+ long irdphase = iwrphase - idsamp;
+ long irdphaseb = irdphase - 1;
+
+ float zin = ZXP(nin);
+ if (irdphase < 0)
+ {
+ dlybuf[iwrphase & mask] = zin;
+ ZXP(nout) = - feedbk * zin;
+ }
+ else if (irdphaseb < 0)
+ {
+ float d1 = dlybuf[irdphase & mask];
+ float value = d1 - frac * d1;
+ float dwr = zin + feedbk * value;
+ dlybuf[iwrphase & mask] = dwr;
+ ZXP(nout) = value - feedbk * dwr;
+ }
+ else
+ {
+ float d1 = dlybuf[irdphase & mask];
+ float d2 = dlybuf[irdphaseb & mask];
+ float value = lininterp(frac, d1, d2);
+ float dwr = zin + feedbk * value;
+ dlybuf[iwrphase & mask] = dwr;
+ ZXP(nout) = value - feedbk * dwr;
+ }
+ iwrphase++;
+ }
+ }
+
+ m_iwrphase = iwrphase;
+ m_numoutput += n;
+ if (m_numoutput >= m_idelaylen)
+ {
+ SETSIGFUN(m_signal_fun,SIGFUN(m_signal_));
+ }
+}
+
+void AllpassL_ar::m_signal_(int n, t_sample *const *in, t_sample *const *out)
+{
+ t_sample *nin = *in;
+ t_sample *nout = *out;
+
+ float *dlybuf = m_dlybuf;
+ long iwrphase = m_iwrphase;
+ float dsamp = m_dsamp;
+ float feedbk = m_feedbk;
+ long mask = m_mask;
+
+ if(delay_changed || decay_changed)
+ {
+ float next_dsamp = CalcDelay(m_delaytime);
+ float dsamp_slope = CALCSLOPE(next_dsamp, dsamp);
+
+ float next_feedbk = CalcFeedback(m_delaytime, m_decaytime);
+ float feedbk_slope = CALCSLOPE(next_feedbk, feedbk);
+
+ for(int i=0; i!= n;++i)
+ {
+ dsamp += dsamp_slope;
+ long idsamp = (long)dsamp;
+ float frac = dsamp - idsamp;
+ long irdphase = iwrphase - idsamp;
+ long irdphaseb = irdphase - 1;
+ float d1 = dlybuf[irdphase & mask];
+ float d2 = dlybuf[irdphaseb & mask];
+ float value = lininterp(frac, d1, d2);
+ float dwr = ZXP(nin) + feedbk * value;
+ dlybuf[iwrphase & mask] = dwr;
+ ZXP(nout) = value - feedbk * dwr;
+ feedbk += feedbk_slope;
+ iwrphase++;
+ }
+ m_feedbk = feedbk;
+ m_dsamp = dsamp;
+ delay_changed = decay_changed = false;
+ }
+ else
+ {
+ long idsamp = (long)dsamp;
+ float frac = dsamp - idsamp;
+
+ for(int i=0; i!= n;++i)
+ {
+ long irdphase = iwrphase - idsamp;
+ long irdphaseb = irdphase - 1;
+ float d1 = dlybuf[irdphase & mask];
+ float d2 = dlybuf[irdphaseb & mask];
+ float value = lininterp(frac, d1, d2);
+ float dwr = ZXP(nin) + feedbk * value;
+ dlybuf[iwrphase & mask] = dwr;
+ ZXP(nout) = value - feedbk * dwr;
+ iwrphase++;
+ }
+ }
+ m_iwrphase = iwrphase;
+}
+
+/* todo: AllpassL for control rate ? */
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