diff options
Diffstat (limited to 'sc4pd/source/Decay2.cpp')
| -rw-r--r-- | sc4pd/source/Decay2.cpp | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/sc4pd/source/Decay2.cpp b/sc4pd/source/Decay2.cpp new file mode 100644 index 0000000..a78a180 --- /dev/null +++ b/sc4pd/source/Decay2.cpp @@ -0,0 +1,154 @@ +/* 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... */ + |