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Diffstat (limited to 'sc4pd/source/LFNoise1.cpp')
| -rw-r--r-- | sc4pd/source/LFNoise1.cpp | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/sc4pd/source/LFNoise1.cpp b/sc4pd/source/LFNoise1.cpp new file mode 100644 index 0000000..c164942 --- /dev/null +++ b/sc4pd/source/LFNoise1.cpp @@ -0,0 +1,232 @@ +/* sc4pd + LFNoise1, LFNoise1~ + + 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: Fred Frith: Gravity + +*/ + +#include "sc4pd.hpp" + + +/* ------------------------ LFNoise1~ -------------------------------*/ + +class LFNoise1_ar: + public sc4pd_dsp +{ + FLEXT_HEADER(LFNoise1_ar,sc4pd_dsp); + +public: + LFNoise1_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; + int m_counter; + int m_sr; + FLEXT_CALLBACK_I(m_seed); + FLEXT_CALLBACK_F(m_set); +}; + +FLEXT_LIB_DSP_V("LFNoise1~",LFNoise1_ar); + +LFNoise1_ar::LFNoise1_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; + + AddOutSignal(); +} + +void LFNoise1_ar::m_dsp(int n, t_sample *const *in, + t_sample *const *out) +{ + m_sr = Samplerate(); +} + + +void LFNoise1_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; + + RGET; + + int remain = n; + do + { + if (counter<=0) + { + counter = (int)(m_sr / sc_max(m_freq, .001f)); + counter = sc_max(1, counter); + float nextlevel = frand2(s1,s2,s3); + slope = (nextlevel - level) / counter; + } + int nsmps = sc_min(remain, counter); + remain -= nsmps; + counter -= nsmps; + + for (int i = 0; i!= nsmps;++i) + { + (*(nout)++)=level; + level+=slope; + } + } + while(remain); + + m_level = level; + m_counter = counter; + m_slope = slope; + + RPUT; +} + + +/* ------------------------ LFNoise1 ---------------------------------*/ + +class LFNoise1_kr: + public flext_base +{ + FLEXT_HEADER(LFNoise1_kr,flext_base); + +public: + LFNoise1_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 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("LFNoise1",LFNoise1_kr); + +LFNoise1_kr::LFNoise1_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 LFNoise1_kr::m_set(float f) +{ + dt = sc_max(1/f, .001f); + counter = (dt/tick); + + float nextlevel = rgen.frand2(); + m_slope = (nextlevel - m_level) / counter; + + m_timer.Reset(); + m_timer.Delay(tick); +} + +void LFNoise1_kr::m_perform(void*) +{ + m_level+=m_slope; + ToOutFloat(0,m_level); + if (--counter) + { + m_timer.Reset(); + m_timer.Delay(tick); + } + else + { + counter = (dt/tick); + float nextlevel = rgen.frand2(); + m_slope = (nextlevel - m_level) / counter; + + m_timer.Reset(); + m_timer.Delay(tick); + + } +} |