Marsyas
0.6.0-alpha
|
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 "AliasingOsc.h" 00021 00022 using std::ostringstream; 00023 using namespace Marsyas; 00024 00025 AliasingOsc::AliasingOsc(mrs_string name) : MarSystem("AliasingOsc", name) 00026 { 00027 currentValue_ = 0; 00028 incr_ = 0; 00029 cyclicRate_ = 0; 00030 israte_ = 0; 00031 frequency_ = 0; 00032 type_ = 0; 00033 00034 addControls(); 00035 } 00036 00037 AliasingOsc::AliasingOsc(const AliasingOsc& a) : MarSystem(a) 00038 { 00039 // IMPORTANT! 00040 // All member MarControlPtr have to be explicitly reassigned in 00041 // the copy constructor. 00042 // Otherwise this would result in trying to deallocate them twice! 00043 } 00044 00045 00046 AliasingOsc::~AliasingOsc() 00047 { 00048 } 00049 00050 MarSystem* AliasingOsc::clone() const 00051 { 00052 // Every MarSystem should do this. 00053 return new AliasingOsc(*this); 00054 } 00055 00056 void AliasingOsc::addControls() 00057 { 00058 addctrl("mrs_real/frequency", 440.0); 00059 addctrl("mrs_natural/type", 0); 00060 addctrl("mrs_real/cyclicrate", 0.0); 00061 addctrl("mrs_bool/cyclicin", false); 00062 00063 setctrlState("mrs_real/frequency", true); 00064 setctrlState("mrs_natural/type", true); 00065 setctrlState("mrs_real/cyclicrate", true); 00066 } 00067 00068 void AliasingOsc::myUpdate(MarControlPtr sender) 00069 { 00070 MRSDIAG("AliasingOsc.cpp - AliasingOsc:myUpdate"); 00071 00072 // Start the default MarSystem setup with equal input/output stream format. 00073 MarSystem::myUpdate(sender); 00074 00075 // This sets the ouput channels to 1, as this is a mono oscillator 00076 ctrl_onObservations_->setValue(1, NOUPDATE); 00077 00078 // Because our range is from -1 to 1, and frequency / israte is 00079 // for the range 0 to 1. We need to double the frequency to 00080 // accomedate the larger range. 00081 frequency_ = (getctrl("mrs_real/frequency")->to<mrs_real>()); 00082 israte_ = (getctrl("mrs_real/israte")->to<mrs_real>()); 00083 cyclicIn_ = (getctrl("mrs_bool/cyclicin")->to<mrs_bool>()); 00084 00085 type_ = (getctrl("mrs_natural/type")->to<mrs_natural>()); 00086 cyclicRate_ = (getctrl("mrs_real/cyclicrate")->to<mrs_real>()); 00087 } 00088 00089 void AliasingOsc::myProcess(realvec& in, realvec& out) 00090 { 00091 mrs_natural t; 00092 00093 for (t = 0; t < inSamples_; t++) 00094 { 00095 00096 incr_ = (frequency_ * (in(0,t) + 1) ) / israte_; 00097 00098 currentValue_ += incr_; 00099 if (currentValue_ >= 1) 00100 { 00101 currentValue_ -= 2; 00102 } 00103 00104 // Logic for different oscillator types 00105 switch(type_) 00106 { 00107 case 0: // Saw 00108 out(0,t) = currentValue_; 00109 break; 00110 case 1: // PWM 00111 if (currentValue_ >= (cyclicIn_ ? in(1,t) : cyclicRate_)) 00112 { 00113 out(0,t) = 0.9; 00114 } 00115 else 00116 { 00117 out(0,t) = -0.9; 00118 } 00119 break; 00120 } 00121 } 00122 }