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Diffstat (limited to 'sc4pd/source/DelayN.cpp')
| -rw-r--r-- | sc4pd/source/DelayN.cpp | 238 |
1 files changed, 238 insertions, 0 deletions
diff --git a/sc4pd/source/DelayN.cpp b/sc4pd/source/DelayN.cpp new file mode 100644 index 0000000..6bbbb18 --- /dev/null +++ b/sc4pd/source/DelayN.cpp @@ -0,0 +1,238 @@ +/* sc4pd + DelayN~ + + 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: + +*/ + +#include "sc4pd.hpp" +#include "DelayUnit.hpp" + +class DelayN_ar : private DelayUnit_ar +{ + FLEXT_HEADER(DelayN_ar,DelayUnit_ar); + + DelayN_ar (int argc, t_atom *argv); + ~DelayN_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("DelayN~",DelayN_ar); + +DelayN_ar::DelayN_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(); +} + +DelayN_ar::~DelayN_ar () +{ + DelayUnit_Dtor(); +} + +void DelayN_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 irdphase = iwrphase - (long)dsamp; + + dlybuf[iwrphase & mask] = ZXP(nin); + if (irdphase < 0) + { + ZXP(nout) = 0.f; + } + else + { + ZXP(nout) = dlybuf[irdphase & mask]; + } + iwrphase++; + } + m_dsamp = dsamp; + changed = false; + } + else + { + long irdphase = iwrphase - (long)dsamp; + float* dlybuf1 = dlybuf - ZOFF; + float* dlyN = dlybuf1 + m_idelaylen; + 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) + { + for (int i = 0; i!= nsmps;++i) + { + ZXP(dlywr) = ZXP(nin); + ZXP(nout) = 0.f; + } + } + else + { + for (int i = 0; i!= nsmps;++i) + { + ZXP(dlywr) = ZXP(nin); + ZXP(nout) = ZXP(dlyrd); + } + } + iwrphase += nsmps; + irdphase += nsmps; + } + } + + m_iwrphase = iwrphase; + + m_numoutput += n; + + if (m_numoutput >= m_idelaylen) + { + SETSIGFUN(m_signal_fun,SIGFUN(m_signal_)); + } +} + +void DelayN_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; + ++iwrphase; + long irdphase = iwrphase - (long)dsamp; + ZXP(nout) = dlybuf[irdphase & mask]; + } + m_dsamp = dsamp; + 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; + 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) + { + ZXP(dlywr) = ZXP(nin); + ZXP(nout) = ZXP(dlyrd); + } + if (dlyrd == dlyN) dlyrd = dlybuf1; + if (dlywr == dlyN) dlywr = dlybuf1; + } + iwrphase += n; + } + m_iwrphase = iwrphase; +} + +/* todo: DelayN for control rate ? */ |