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Diffstat (limited to 'sc4pd/source/PinkNoise.cpp')
| -rw-r--r-- | sc4pd/source/PinkNoise.cpp | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/sc4pd/source/PinkNoise.cpp b/sc4pd/source/PinkNoise.cpp new file mode 100644 index 0000000..296f383 --- /dev/null +++ b/sc4pd/source/PinkNoise.cpp @@ -0,0 +1,174 @@ +/* sc4pd + PinkNoise, PinkNoise~ + + 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: Gottfried Michael Koenig: Klangfiguren II + +*/ + +#include "sc4pd.hpp" + +/* ------------------------ PinkNoise~ -------------------------------*/ + +class PinkNoise_ar: + public sc4pd_dsp +{ + FLEXT_HEADER(PinkNoise_ar,sc4pd_dsp); + +public: + PinkNoise_ar(int argc, t_atom *argv); + +protected: + virtual void m_signal(int n, t_sample *const *in, t_sample *const *out); + + void m_seed(int i) + { + rgen.init(i); + } + +private: + uint32 m_dice[16]; + int32 m_total; + RGen rgen; + FLEXT_CALLBACK_I(m_seed); +}; + +FLEXT_LIB_DSP_V("PinkNoise~",PinkNoise_ar); + +PinkNoise_ar::PinkNoise_ar(int argc, t_atom *argv) + : m_total(0) +{ + FLEXT_ADDMETHOD_(0,"seed",m_seed); + + //parse arguments + AtomList Args(argc,argv); + + rgen.init(timeseed()); + + for (int i=0; i<16; ++i) + { + uint32 newrand = rgen.trand() >> 13; + m_total += newrand; + m_dice[i] = newrand; + } + + AddOutSignal(); +} + + +void PinkNoise_ar::m_signal(int n, t_sample *const *in, + t_sample *const *out) +{ + t_sample *nout = *out; + + RGET; + uint32 total = m_total; + uint32 *dice = m_dice; + + for (int i = 0; i!= n;++i) + { + uint32 counter = trand(s1,s2,s3); // Magnus Jonsson's suggestion. + uint32 newrand = counter >> 13; + int k = (CTZ(counter)) & 15; + uint32 prevrand = dice[k]; + dice[k] = newrand; + total += (newrand - prevrand); + newrand = trand(s1,s2,s3) >> 13; + uint32 ifval = (total + newrand) | 0x40000000; + (*(nout)++) = ((*(float*)&ifval) - 3.0f); + } + RPUT; +} + + +/* ------------------------ PinkNoise ---------------------------------*/ + +class PinkNoise_kr: + public flext_base +{ + FLEXT_HEADER(PinkNoise_kr,flext_base); + +public: + PinkNoise_kr(int argc, t_atom *argv); + +protected: + void m_perform(); + + void m_seed(int i) + { + rgen.init(i); + } + +private: + uint32 m_dice[16]; + int32 m_total; + RGen rgen; + FLEXT_CALLBACK(m_perform); + FLEXT_CALLBACK_I(m_seed); +}; + +FLEXT_LIB_V("PinkNoise",PinkNoise_kr); + +PinkNoise_kr::PinkNoise_kr(int argc, t_atom *argv) + : m_total(0) +{ + FLEXT_ADDBANG(0,m_perform); + FLEXT_ADDMETHOD_(0,"seed",m_seed); + + //parse arguments + AtomList Args(argc,argv); + + rgen.init(timeseed()); + + for (int i=0; i<16; ++i) + { + uint32 newrand = rgen.trand() >> 13; + m_total += newrand; + m_dice[i] = newrand; + } + + AddOutFloat(); +} + +void PinkNoise_kr::m_perform() +{ + uint32 counter = rgen.trand(); // Magnus Jonsson's suggestion. + uint32 newrand = counter >> 13; + int k = (CTZ(counter)) & 15; + uint32 prevrand = m_dice[k]; + m_dice[k] = newrand; + m_total += (newrand - prevrand); + newrand = rgen.trand() >> 13; + uint32 ifval = (m_total + newrand) | 0x40000000; + + ToOutFloat(0,((*(float*)&ifval) - 3.0f)); +} |