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Diffstat (limited to 'sc4pd/source/LFPulse.cpp')
| -rw-r--r-- | sc4pd/source/LFPulse.cpp | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/sc4pd/source/LFPulse.cpp b/sc4pd/source/LFPulse.cpp new file mode 100644 index 0000000..ad16e65 --- /dev/null +++ b/sc4pd/source/LFPulse.cpp @@ -0,0 +1,292 @@ +/* sc4pd + LFPulse, LFPulse~ + + 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: Keith Rowe & Oren Ambarchi: Flypaper + +*/ + +#include "sc4pd.hpp" + + +/* ------------------------ LFPulse~ -------------------------------*/ + +class LFPulse_ar: + public sc4pd_dsp +{ + FLEXT_HEADER(LFPulse_ar,sc4pd_dsp); + +public: + LFPulse_ar(int argc, t_atom *argv); + +protected: + virtual void m_signal(int n, t_sample *const *in, t_sample *const *out) + { + m_signal_fun(n,in,out); + } + virtual void m_dsp(int n, t_sample *const *in, t_sample *const *out); + + void m_set(float f) + { + m_freq=f; + } + + void m_ar() + { + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_ar)); + } + + void m_kr() + { + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_kr)); + } + + void m_width (float f) + { + nextDuty = f; + } + + +private: + double mPhase; + float mFreqMul; + float m_freq; //for kr arguments + float mDuty; + float nextDuty; + + DEFSIGCALL (m_signal_fun); + DEFSIGFUN (m_signal_ar); + DEFSIGFUN (m_signal_kr); + + FLEXT_CALLBACK_F(m_set); + FLEXT_CALLBACK_F(m_width); + FLEXT_CALLBACK(m_ar); + FLEXT_CALLBACK(m_kr); +}; + +FLEXT_LIB_DSP_V("LFPulse~",LFPulse_ar); + +LFPulse_ar::LFPulse_ar(int argc, t_atom *argv) +{ + FLEXT_ADDMETHOD_(0,"freq",m_set); + FLEXT_ADDMETHOD_(0,"width",m_width); + FLEXT_ADDMETHOD_(0,"ar",m_ar); + FLEXT_ADDMETHOD_(0,"kr",m_kr); + + //parse arguments + AtomList Args(argc,argv); + + m_freq = sc_getfloatarg(Args,0); + + nextDuty = sc_getfloatarg(Args,1); + + if(sc_ar(Args)) + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_ar)); + else // if not given, use control rate + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_kr)); + + AddOutSignal(); +} + +void LFPulse_ar::m_dsp(int n, t_sample *const *in, t_sample *const *out) +{ + mFreqMul = 1 / Samplerate(); + +} + +void LFPulse_ar::m_signal_ar(int n, t_sample *const *in, + t_sample *const *out) +{ + t_sample *freq = *in; + t_sample *xout = *out; + + float freqmul = mFreqMul; + double phase = mPhase; + float duty = mDuty; + + for (int i = 0; i!= n;++i) + { + float z; + if (phase >= 1.f) + { + phase -= 1.f; + duty = mDuty = nextDuty; + // output at least one sample from the opposite polarity + z = duty < 0.5 ? 1.f : 0.f; + } + else + { + z = phase < duty ? 1.f : 0.f; + } + + phase += (*(freq)++) * freqmul; + (*(xout)++) = z; + } + + mPhase=phase; +} + + +void LFPulse_ar::m_signal_kr(int n, t_sample *const *in, + t_sample *const *out) +{ + t_sample *xout = *out; + + double phase = mPhase; + float duty = mDuty; + float freq = m_freq * mFreqMul; + + for (int i = 0; i!= n;++i) + { + float z; + if (phase >= 1.f) + { + phase -= 1.f; + duty = mDuty = nextDuty; + // output at least one sample from the opposite polarity + z = duty < 0.5 ? 1.f : 0.f; + } + else + { + z = phase < duty ? 1.f : 0.f; + } + + phase += freq; + (*(xout)++) = z; + } + mPhase=phase; +} + +/* ------------------------ LFPulse ---------------------------------*/ + +/* todo: remove obsolete messages */ + +class LFPulse_kr: + public flext_base +{ + FLEXT_HEADER(LFPulse_kr,flext_base); + +public: + LFPulse_kr(int argc, t_atom *argv); + +protected: + void m_perform(void*); + + void m_set(float f) + { + m_freq_set = f; + m_freq = f * mFreqMul; + } + + void m_set_kr(float f) + { + if (f != 0) + { + dt = f * 0.001; + mFreqMul = dt; + m_freq = m_freq_set * mFreqMul; + m_timer.Reset(); + m_timer.Periodic(dt); + } + } + + void m_set_width(float f) + { + nextDuty=f; + } + +private: + double mPhase; + float mFreqMul; + float mDuty; + float nextDuty; + float m_freq; + float dt; + float m_freq_set; + + Timer m_timer; + + FLEXT_CALLBACK_F(m_set_kr); + FLEXT_CALLBACK_F(m_set); + FLEXT_CALLBACK_F(m_set_width); + FLEXT_CALLBACK_T(m_perform); +}; + + +FLEXT_LIB_V("LFPulse",LFPulse_kr); + +LFPulse_kr::LFPulse_kr(int argc, t_atom *argv) +{ + FLEXT_ADDMETHOD(0,m_set); + FLEXT_ADDMETHOD_(0,"kr",m_set_kr); + FLEXT_ADDMETHOD_(0,"width",m_set_width); + + FLEXT_ADDTIMER(m_timer,m_perform); + + AddOutFloat(); + + //parse arguments + AtomList Args(argc,argv); + + m_freq_set = sc_getfloatarg(Args,0); + + nextDuty = sc_getfloatarg(Args,1); + + dt = sc_getfloatarg(Args,2) * 0.001; + + if (dt == 0) + dt = 0.02; // 20 ms as default control rate as in line + mFreqMul = dt; + + m_freq = m_freq_set * mFreqMul; + + m_timer.Periodic(dt); + +} + +void LFPulse_kr::m_perform(void*) +{ + float z; + if (mPhase >= 1.f) + { + mPhase -= 1.f; + mDuty = nextDuty; + // output at least one sample from the opposite polarity + z = mDuty < 0.5 ? 1.f : 0.f; + } + else + { + z = mPhase < mDuty ? 1.f : 0.f; + } + mPhase += m_freq; + ToOutFloat(0,z); +} |