Marsyas
0.6.0-alpha
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00001 /* 00002 ** Copyright (C) 1998-2010 George Tzanetakis <gtzan@cs.uvic.ca> 00003 ** 00004 ** This program is free software; you can redistribute it and/or modify 00005 ** it under the terms of the GNU General Public License as published by 00006 ** the Free Software Foundation; either version 2 of the License, or 00007 ** (at your option) any later version. 00008 ** 00009 ** This program is distributed in the hope that it will be useful, 00010 ** but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 ** GNU General Public License for more details. 00013 ** 00014 ** You should have received a copy of the GNU General Public License 00015 ** along with this program; if not, write to the Free Software 00016 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00017 */ 00018 00019 #include "../common_source.h" 00020 #include "DPWOsc.h" 00021 #include "math.h" 00022 00023 using std::ostringstream; 00024 using namespace Marsyas; 00025 00026 DPWOsc::DPWOsc(mrs_string name) : MarSystem("DPWOsc", name) 00027 { 00028 currentValue_ = 0; 00029 incr_ = 0; 00030 cyclicRate_ = 0; 00031 israte_ = 0; 00032 frequency_ = 0; 00033 type_ = 0; 00034 00035 addControls(); 00036 } 00037 00038 DPWOsc::DPWOsc(const DPWOsc& a) : MarSystem(a) 00039 { 00040 // IMPORTANT! 00041 // All member MarControlPtr have to be explicitly reassigned in 00042 // the copy constructor. 00043 // Otherwise this would result in trying to deallocate them twice! 00044 } 00045 00046 00047 DPWOsc::~DPWOsc() 00048 { 00049 } 00050 00051 MarSystem* DPWOsc::clone() const 00052 { 00053 // Every MarSystem should do this. 00054 return new DPWOsc(*this); 00055 } 00056 00057 void DPWOsc::addControls() 00058 { 00059 addctrl("mrs_real/frequency", 440.0); 00060 addctrl("mrs_natural/type", 0); 00061 addctrl("mrs_real/cyclicrate", 0.0); 00062 addctrl("mrs_bool/cyclicin", false); 00063 00064 setctrlState("mrs_real/frequency", true); 00065 setctrlState("mrs_natural/type", true); 00066 setctrlState("mrs_real/cyclicrate", true); 00067 } 00068 00069 void DPWOsc::myUpdate(MarControlPtr sender) 00070 { 00071 MRSDIAG("DPWOsc.cpp - DPWOsc:myUpdate"); 00072 00073 // Start the default MarSystem setup with equal input/output stream format. 00074 MarSystem::myUpdate(sender); 00075 00076 // This sets the ouput channels to 1, as this is a mono oscillator 00077 ctrl_onObservations_->setValue(1, NOUPDATE); 00078 00079 // Because our range is from -1 to 1, and frequency / israte is 00080 // for the range 0 to 1. We need to double the frequency to 00081 // accomedate the larger range. 00082 frequency_ = 2 * (getctrl("mrs_real/frequency")->to<mrs_real>()); 00083 israte_ = (getctrl("mrs_real/israte")->to<mrs_real>()); 00084 cyclicIn_ = (getctrl("mrs_bool/cyclicin")->to<mrs_bool>()); 00085 c_ = israte_/(4 * frequency_ * (1 - (frequency_/israte_))); 00086 00087 incr_ = (frequency_ ) / israte_; 00088 type_ = (getctrl("mrs_natural/type")->to<mrs_natural>()); 00089 cyclicRate_ = (getctrl("mrs_real/cyclicrate")->to<mrs_real>()); 00090 } 00091 00092 void DPWOsc::myProcess(realvec& in, realvec& out) 00093 { 00094 for (mrs_natural t = 0; t < inSamples_; t++) 00095 { 00096 incr_ = (frequency_ * (in(0,t) + 1) ) / israte_; 00097 00098 currentValue_ += incr_; 00099 if (currentValue_ >= 1) 00100 { 00101 currentValue_ -= 2; 00102 } 00103 00104 out(0,t) = c_ * df(currentValue_ * currentValue_); 00105 } 00106 }