Marsyas
0.6.0-alpha
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00001 /* 00002 ** Copyright (C) 1998-2006 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 "OnePole.h" 00020 00021 using std::ostringstream; 00022 using namespace Marsyas; 00023 00024 00025 OnePole::OnePole(mrs_string name) : MarSystem("OnePole", name) 00026 { 00027 addControls(); 00028 } 00029 00030 00031 OnePole::~OnePole() 00032 { 00033 } 00034 00035 00036 MarSystem* 00037 OnePole::clone() const 00038 { 00039 return new OnePole(*this); 00040 } 00041 00042 void 00043 OnePole::addControls() 00044 { 00045 addControl("mrs_real/alpha", 0.9); 00046 setControlState("mrs_real/alpha", true); 00047 } 00048 00049 00050 void 00051 OnePole::myUpdate(MarControlPtr sender) 00052 { 00053 // Use the default MarSystem setup with equal input/output stream format. 00054 MarSystem::myUpdate(sender); 00055 00056 // Cache the alpha and gain value. 00057 alpha_ = getControl("mrs_real/alpha")->to<mrs_real>(); 00058 gain_ = 1.0 - alpha_; 00059 00060 // Allocate and initialize the buffer for previous output samples. 00061 mrs_natural rows = ctrl_inObservations_->to<mrs_natural>(); 00062 previousOutputSamples_.stretch(rows, 1); 00063 previousOutputSamples_.setval(0.0); 00064 } 00065 00066 void 00067 OnePole::myProcess(realvec& in, realvec& out) 00068 { 00069 mrs_natural t,o; 00070 for (o = 0; o < inObservations_; o++) 00071 { 00072 // Use the last sample from the previous slice for the first sample of 00073 // this slice. 00074 t = 0; 00075 out(o, t) = gain_ * in(o, t) + alpha_ * previousOutputSamples_(o, 0); 00076 00077 // Do the remaining samples. 00078 for (t = 1; t < inSamples_; t++) 00079 { 00080 out(o, t) = gain_ * in(o, t) + alpha_ * out(o, t - 1); 00081 } 00082 00083 // Store the last sample for usage in next process() call. 00084 previousOutputSamples_(o, 0) = out(o, inSamples_ - 1); 00085 } 00086 }