diff options
Diffstat (limited to 'sc4pd/source/AllpassN.cpp')
| -rw-r--r-- | sc4pd/source/AllpassN.cpp | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/sc4pd/source/AllpassN.cpp b/sc4pd/source/AllpassN.cpp new file mode 100644 index 0000000..a03130b --- /dev/null +++ b/sc4pd/source/AllpassN.cpp @@ -0,0 +1,348 @@ +/* sc4pd + AllpassN~ + + 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: Efzeg: Boogie + +*/ + +#include "sc4pd.hpp" +#include "DelayUnit.hpp" + +class AllpassN_ar : public FeedbackDelay_ar +{ + FLEXT_HEADER(AllpassN_ar,FeedbackDelay_ar); + + AllpassN_ar (int argc, t_atom *argv); + ~AllpassN_ar (); + +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) + { + delay_changed = decay_changed = false; + FeedbackDelay_Reset(); + } + + void m_delay(float f) + { + m_delaytime=f; + delay_changed = true; + } + + void m_decay(float f) + { + m_decaytime=f; + decay_changed = true; + } + +private: + bool delay_changed, decay_changed; + DEFSIGCALL(m_signal_fun); + DEFSIGFUN(m_signal_); + DEFSIGFUN(m_signal_z); + + FLEXT_CALLBACK_F(m_delay); + FLEXT_CALLBACK_F(m_decay); +}; + +FLEXT_LIB_DSP_V("AllpassN~",AllpassN_ar); + +AllpassN_ar::AllpassN_ar (int argc, t_atom *argv) +{ + FLEXT_ADDMETHOD_(0,"delaytime",m_delay); + FLEXT_ADDMETHOD_(0,"decaytime",m_decay); + + //parse arguments + AtomList Args(argc,argv); + + if (Args.Count() != 3) + { + post("3 arguments are needed"); + return; + } + + m_maxdelaytime = sc_getfloatarg(Args,0); + m_delaytime = sc_getfloatarg(Args,1); + m_decaytime = sc_getfloatarg(Args,2); + + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_z)); + + AddOutSignal(); +} + +AllpassN_ar::~AllpassN_ar () +{ + DelayUnit_Dtor(); +} + +void AllpassN_ar::m_signal_z(int n, t_sample *const *in, t_sample *const *out) +{ + t_sample *nin = *in; + t_sample *nout = *out; + + float *dlybuf = m_dlybuf; + long iwrphase = m_iwrphase; + float dsamp = m_dsamp; + float feedbk = m_feedbk; + long mask = m_mask; + + if (delay_changed) + { + float next_dsamp = CalcDelay(m_delaytime); + float dsamp_slope = CALCSLOPE(next_dsamp, dsamp); + + float next_feedbk = CalcFeedback(m_delaytime, m_decaytime); + float feedbk_slope = CALCSLOPE(next_feedbk, feedbk); + + for (int i = 0; i!= n;++i) + { + dsamp += dsamp_slope; + long irdphase = iwrphase - (long)dsamp; + + if (irdphase < 0) + { + float dwr = ZXP(nin); + dlybuf[iwrphase & mask] = dwr; + ZXP(nout) = -feedbk * dwr; + } + else + { + float value = dlybuf[irdphase & mask]; + float dwr = feedbk * value + ZXP(nin); + dlybuf[iwrphase & mask] = dwr; + ZXP(nout) = value - feedbk * dwr; + } + feedbk += feedbk_slope; + iwrphase++; + } + m_feedbk = feedbk; + m_dsamp = dsamp; + delay_changed = decay_changed = false; + } + else + { + long irdphase = iwrphase - (long)dsamp; + float* dlybuf1 = dlybuf - ZOFF; + float* dlyN = dlybuf1 + m_idelaylen; + if (decay_changed) + { + float next_feedbk = CalcFeedback(m_delaytime, m_decaytime); + float feedbk_slope = CALCSLOPE(next_feedbk, feedbk); + long remain = n; + while (remain) + { + float* dlywr = dlybuf1 + (iwrphase & mask); + float* dlyrd = dlybuf1 + (irdphase & mask); + long rdspace = dlyN - dlyrd; + long wrspace = dlyN - dlywr; + long nsmps = sc_min(rdspace, wrspace); + nsmps = sc_min(remain, nsmps); + remain -= nsmps; + if (irdphase < 0) + { + dlyrd += nsmps; + for (int i = 0; i!= nsmps;++i) + { + float dwr = ZXP(nin); + ZXP(dlywr) = dwr; + ZXP(nout) = -feedbk * dwr; + feedbk += feedbk_slope; + } + } + else + { + for (int i = 0; i!= nsmps;++i) + { + float x1 = ZXP(dlyrd); + float dwr = x1 * feedbk + ZXP(nin); + ZXP(dlywr) = dwr; + ZXP(nout) = x1 - feedbk * dwr; + feedbk += feedbk_slope; + } + } + iwrphase += nsmps; + irdphase += nsmps; + } + decay_changed=false; + } + else + { + long remain = n; + while (remain) + { + float* dlyrd = dlybuf1 + (irdphase & mask); + float* dlywr = dlybuf1 + (iwrphase & mask); + long rdspace = dlyN - dlyrd; + long wrspace = dlyN - dlywr; + long nsmps = sc_min(rdspace, wrspace); + nsmps = sc_min(remain, nsmps); + remain -= nsmps; + + if (irdphase < 0) + { + feedbk = -feedbk; + for (int i = 0; i!= nsmps;++i) + { + float dwr = ZXP(nin); + ZXP(dlywr) = dwr; + ZXP(nout) = feedbk * dwr; + } + feedbk = -feedbk; + } + else + { + for (int i = 0; i!= nsmps;++i) + { + float x1 = ZXP(dlyrd); + float dwr = x1 * feedbk + ZXP(nin); + ZXP(dlywr) = dwr; + ZXP(nout) = x1 - feedbk * dwr; + } + } + iwrphase += nsmps; + irdphase += nsmps; + } + m_feedbk = feedbk; + } + } + + m_iwrphase = iwrphase; + m_numoutput += n; + if (m_numoutput >= m_idelaylen) + { + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_)); + } +} + +void AllpassN_ar::m_signal_(int n, t_sample *const *in, t_sample *const *out) +{ + t_sample *nin = *in; + t_sample *nout = *out; + + float *dlybuf = m_dlybuf; + long iwrphase = m_iwrphase; + float dsamp = m_dsamp; + float feedbk = m_feedbk; + long mask = m_mask; + + if(delay_changed) + { + float next_dsamp = CalcDelay(m_delaytime); + float dsamp_slope = CALCSLOPE(next_dsamp, dsamp); + + float next_feedbk = CalcFeedback(m_delaytime, m_decaytime); + float feedbk_slope = CALCSLOPE(next_feedbk, feedbk); + + for(int i=0; i!= n;++i) + { + dsamp += dsamp_slope; + ++iwrphase; + long irdphase = iwrphase - (long)dsamp; + float value = dlybuf[irdphase & mask]; + float dwr = value * feedbk + ZXP(nin); + dlybuf[iwrphase & mask] = dwr; + ZXP(nout) = value - feedbk * dwr; + feedbk += feedbk_slope; + } + m_feedbk = feedbk; + m_dsamp = dsamp; + delay_changed = decay_changed = false; + } + else + { + long irdphase = iwrphase - (long)dsamp; + float* dlybuf1 = dlybuf - ZOFF; + float* dlyrd = dlybuf1 + (irdphase & mask); + float* dlywr = dlybuf1 + (iwrphase & mask); + float* dlyN = dlybuf1 + m_idelaylen; + + if(decay_changed) + { + float next_feedbk = CalcFeedback(m_delaytime, m_decaytime); + float feedbk_slope = CALCSLOPE(next_feedbk, feedbk); + long remain = n; + while (remain) + { + long rdspace = dlyN - dlyrd; + long wrspace = dlyN - dlywr; + long nsmps = sc_min(rdspace, wrspace); + nsmps = sc_min(remain, nsmps); + remain -= nsmps; + + for(int i=0; i!= nsmps;++i) + { + float value = ZXP(dlyrd); + float dwr = value * feedbk + ZXP(nin); + ZXP(dlywr) = dwr; + ZXP(nout) = value - feedbk * dwr; + feedbk += feedbk_slope; + } + if (dlyrd == dlyN) dlyrd = dlybuf1; + if (dlywr == dlyN) dlywr = dlybuf1; + } + m_feedbk = feedbk; + decay_changed = false; + } + else + { + long remain = n; + while (remain) + { + long rdspace = dlyN - dlyrd; + long wrspace = dlyN - dlywr; + long nsmps = sc_min(rdspace, wrspace); + nsmps = sc_min(remain, nsmps); + remain -= nsmps; + + for (int i = 0; i!= nsmps; ++i) + { + float value = ZXP(dlyrd); + float dwr = value * feedbk + ZXP(nin); + ZXP(dlywr) = dwr; + ZXP(nout) = value - feedbk * dwr; + } + if (dlyrd == dlyN) dlyrd = dlybuf1; + if (dlywr == dlyN) dlywr = dlybuf1; + } + + } + iwrphase += n; + } + m_iwrphase = iwrphase; +} + +/* todo: AllpassN for control rate ? */ |