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Diffstat (limited to 'sc4pd/source/LFNoise2.cpp')
| -rw-r--r-- | sc4pd/source/LFNoise2.cpp | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/sc4pd/source/LFNoise2.cpp b/sc4pd/source/LFNoise2.cpp new file mode 100644 index 0000000..3b1fd37 --- /dev/null +++ b/sc4pd/source/LFNoise2.cpp @@ -0,0 +1,271 @@ +/* sc4pd + LFNoise2, LFNoise2~ + + 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: Guenther Mueller & Toshimaru Nakamura: Tint + +*/ + +#include "sc4pd.hpp" + + +/* ------------------------ LFNoise2~ -------------------------------*/ + +class LFNoise2_ar: + public sc4pd_dsp +{ + FLEXT_HEADER(LFNoise2_ar,sc4pd_dsp); + +public: + LFNoise2_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_seed(int i) + { + rgen.init(i); + } + + void m_set(float f) + { + m_freq = f; + } + +private: + RGen rgen; + float m_freq; + float m_level; + float m_slope; + float m_curve; + int m_counter; + int m_sr; + float m_nextvalue; + float m_nextmidpt; + + FLEXT_CALLBACK_I(m_seed); + FLEXT_CALLBACK_F(m_set); +}; + +FLEXT_LIB_DSP_V("LFNoise2~",LFNoise2_ar); + +LFNoise2_ar::LFNoise2_ar(int argc, t_atom *argv) +{ + FLEXT_ADDMETHOD_(0,"seed",m_seed); + FLEXT_ADDMETHOD_(0,"set",m_set); + + //parse arguments + AtomList Args(argc,argv); + + m_freq = sc_getfloatarg(Args,0); + + rgen.init(timeseed()); + + m_counter=0; + m_level=rgen.frand2(); + m_slope=0; + m_curve=0; + m_nextvalue=0; + m_nextmidpt=0; + + AddOutSignal(); +} + +void LFNoise2_ar::m_dsp(int n, t_sample *const *in, + t_sample *const *out) +{ + m_sr = Samplerate(); +} + + +void LFNoise2_ar::m_signal(int n, t_sample *const *in, + t_sample *const *out) +{ + t_sample *nout = *out; + + float level = m_level; + int32 counter = m_counter; + float slope = m_slope; + float curve = m_curve; + + RGET; + + int remain = n; + do + { + if (counter<=0) + { + float value = m_nextvalue; + m_nextvalue = frand2(s1,s2,s3); + level = m_nextmidpt; + m_nextmidpt = (m_nextvalue + value) * .5; + + counter = (int32)(m_sr / sc_max(m_freq, .001f)); + counter = sc_max(2, counter); + float fseglen = (float)counter; + curve = 2.f * (m_nextmidpt - level - fseglen * slope) + / (fseglen * fseglen + fseglen); + } + int nsmps = sc_min(remain, counter); + remain -= nsmps; + counter -= nsmps; + + for (int i = 0; i!= nsmps;++i) + { + (*(nout)++)=level; + slope+=curve; + level+=slope; + } + } + while(remain); + + m_level = level; + m_counter = counter; + m_slope = slope; + m_curve = curve; + + RPUT; +} + + +/* ------------------------ LFNoise2 ---------------------------------*/ + +class LFNoise2_kr: + public flext_base +{ + FLEXT_HEADER(LFNoise2_kr,flext_base); + +public: + LFNoise2_kr(int argc, t_atom *argv); + +protected: + void m_perform(void*); + + void m_seed(int i) + { + rgen.init(i); + } + + void m_set(float); + +private: + RGen rgen; + float m_level; + float m_slope; + float m_curve; + float m_nextvalue; + float m_nextmidpt; + + float dt; //in s + float tick; //in s + int counter; + + Timer m_timer; + FLEXT_CALLBACK_I(m_seed); + FLEXT_CALLBACK_T(m_perform); + FLEXT_CALLBACK_F(m_set); +}; + +FLEXT_LIB_V("LFNoise2",LFNoise2_kr); + +LFNoise2_kr::LFNoise2_kr(int argc, t_atom *argv) + : tick(0.01) +{ + FLEXT_ADDMETHOD_(0,"seed",m_seed); + FLEXT_ADDMETHOD_(0,"set",m_set); + FLEXT_ADDTIMER(m_timer,m_perform); + + //parse arguments + AtomList Args(argc,argv); + + rgen.init(timeseed()); + + m_level=rgen.frand2(); + + AddOutFloat(); + + m_set(sc_getfloatarg(Args,0)); +} + + +void LFNoise2_kr::m_set(float f) +{ + dt = sc_max(1/f, .001f); + counter = (dt/tick); + counter = sc_max(2, counter); + + float value = m_nextvalue; + m_nextvalue = rgen.frand2(); + m_level = m_nextmidpt; + m_nextmidpt = (m_nextvalue + value) * .5; + + float fseglen = (float)counter; + m_curve = 2.f * (m_nextmidpt - m_level - fseglen * m_slope) + / (fseglen * fseglen + fseglen); + + + m_timer.Reset(); + m_timer.Delay(tick); +} + +void LFNoise2_kr::m_perform(void*) +{ + m_slope+=m_curve; + m_level+=m_slope; + ToOutFloat(0,m_level); + if (--counter) + { + m_timer.Reset(); + m_timer.Delay(tick); + } + else + { + counter = (dt/tick); + + counter = sc_max(2, counter); + + float value = m_nextvalue; + m_nextvalue = rgen.frand2(); + m_level = m_nextmidpt; + m_nextmidpt = (m_nextvalue + value) * .5; + + float fseglen = (float)counter; + m_curve = 2.f * (m_nextmidpt - m_level - fseglen * m_slope) / + (fseglen * fseglen + fseglen); + + m_timer.Reset(); + m_timer.Delay(tick); + + } +} + |