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Diffstat (limited to 'sc4pd/source/Lag.cpp')
| -rw-r--r-- | sc4pd/source/Lag.cpp | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/sc4pd/source/Lag.cpp b/sc4pd/source/Lag.cpp new file mode 100644 index 0000000..5daf6d1 --- /dev/null +++ b/sc4pd/source/Lag.cpp @@ -0,0 +1,124 @@ +/* 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? */ |