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Diffstat (limited to 'sc4pd/source/DelayL.cpp')
| -rw-r--r-- | sc4pd/source/DelayL.cpp | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/sc4pd/source/DelayL.cpp b/sc4pd/source/DelayL.cpp new file mode 100644 index 0000000..46b5458 --- /dev/null +++ b/sc4pd/source/DelayL.cpp @@ -0,0 +1,236 @@ +/* sc4pd + DelayL~ + + 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: Tom Cora: Halleluja, Anyway + +*/ + +#include "sc4pd.hpp" +#include "DelayUnit.hpp" + +class DelayL_ar : private DelayUnit_ar +{ + FLEXT_HEADER(DelayL_ar,DelayUnit_ar); + + DelayL_ar (int argc, t_atom *argv); + ~DelayL_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) + { + changed = false; + DelayUnit_Reset(); + } + + void m_set(float f) + { + m_delaytime=f; + changed = true; + } + +private: + bool changed; + DEFSIGCALL(m_signal_fun); + DEFSIGFUN(m_signal_); + DEFSIGFUN(m_signal_z); + + FLEXT_CALLBACK_F(m_set); +}; + +FLEXT_LIB_DSP_V("DelayL~",DelayL_ar); + +DelayL_ar::DelayL_ar (int argc, t_atom *argv) +{ + FLEXT_ADDMETHOD_(0,"delaytime",m_set); + + //parse arguments + AtomList Args(argc,argv); + + if (Args.Count() != 2) + { + post("2 arguments are needed"); + return; + } + + m_delaytime = sc_getfloatarg(Args,0); + m_maxdelaytime = sc_getfloatarg(Args,1); + + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_z)); + + AddOutSignal(); +} + +DelayL_ar::~DelayL_ar () +{ + DelayUnit_Dtor(); +} + +void DelayL_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; + long mask = m_mask; + + if (changed) + { + float next_dsamp = CalcDelay(m_delaytime); + float dsamp_slope = CALCSLOPE(next_dsamp, dsamp); + + for (int i = 0; i!= n;++i) + { + dsamp += dsamp_slope; + long idsamp = (long)dsamp; + float frac = dsamp - idsamp; + long irdphase = iwrphase - idsamp; + long irdphaseb = irdphase - 1; + + dlybuf[iwrphase & mask] = ZXP(nin); + if (irdphase < 0) + { + ZXP(nout) = 0.f; + } + else if (irdphaseb < 0) + { + float d1 = dlybuf[irdphase & mask]; + ZXP(nout) = d1 - frac * d1; + } + else + { + float d1 = dlybuf[irdphase & mask]; + float d2 = dlybuf[irdphaseb & mask]; + ZXP(nout) = lininterp(frac, d1, d2); + } + iwrphase++; + } + m_dsamp = dsamp; + changed = false; + } + else + { + long idsamp = (long)dsamp; + float frac = dsamp - idsamp; + for (int i = 0; i!= n;++i) + { + long irdphase = iwrphase - idsamp; + long irdphaseb = irdphase - 1; + + dlybuf[iwrphase & mask] = ZXP(nin); + if (irdphase < 0) + { + ZXP(nout) = 0.f; + } + else if (irdphaseb < 0) + { + float d1 = dlybuf[irdphase & mask]; + ZXP(nout) = d1 - frac * d1; + } + else + { + float d1 = dlybuf[irdphase & mask]; + float d2 = dlybuf[irdphaseb & mask]; + ZXP(nout) = lininterp(frac, d1, d2); + } + iwrphase++; + } + } + + m_iwrphase = iwrphase; + + m_numoutput += n; + + if (m_numoutput >= m_idelaylen) + { + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_)); + } +} + +void DelayL_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; + long mask = m_mask; + + if (changed) + { + float next_dsamp = CalcDelay(m_delaytime); + float dsamp_slope = CALCSLOPE(next_dsamp, dsamp); + + for (int i = 0; i!= n;++i) + { + dlybuf[iwrphase & mask] = ZXP(nin); + dsamp += dsamp_slope; + long idsamp = (long)dsamp; + float frac = dsamp - idsamp; + long irdphase = iwrphase - idsamp; + long irdphaseb = irdphase - 1; + float d1 = dlybuf[irdphase & mask]; + float d2 = dlybuf[irdphaseb & mask]; + ZXP(nout) = lininterp(frac, d1, d2); + iwrphase++; + } + m_dsamp = dsamp; + changed = false; + } + else + { + long idsamp = (long)dsamp; + float frac = dsamp - idsamp; + for (int i = 0; i!= n;++i) + { + dlybuf[iwrphase & mask] = ZXP(nin); + long irdphase = iwrphase - idsamp; + long irdphaseb = irdphase - 1; + float d1 = dlybuf[irdphase & mask]; + float d2 = dlybuf[irdphaseb & mask]; + ZXP(nout) = lininterp(frac, d1, d2); + iwrphase++; + } + + } + m_iwrphase = iwrphase; +} + +/* todo: DelayL for control rate ? */ |