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 "ResampleLinear.h" 00020 #include "../common_source.h" 00021 00022 using namespace std; 00023 using namespace Marsyas; 00024 00025 ResampleLinear::ResampleLinear(mrs_string name):MarSystem("ResampleLinear", name) 00026 { 00027 addControls(); 00028 } 00029 00030 ResampleLinear::ResampleLinear(const ResampleLinear& a) : MarSystem(a) 00031 { 00032 ctrl_stretch_ = getctrl("mrs_real/stretch"); 00033 ctrl_samplingRateAdjustmentMode_ = getctrl("mrs_bool/samplingRateAdjustmentMode"); 00034 } 00035 00036 00037 ResampleLinear::~ResampleLinear() 00038 { 00039 } 00040 00041 MarSystem* 00042 ResampleLinear::clone() const 00043 { 00044 return new ResampleLinear(*this); 00045 } 00046 00047 void 00048 ResampleLinear::addControls() 00049 { 00050 addctrl("mrs_real/stretch", 1.0, ctrl_stretch_); 00051 addctrl("mrs_bool/samplingRateAdjustmentMode", (mrs_bool)true , ctrl_samplingRateAdjustmentMode_); 00052 00053 setctrlState("mrs_real/stretch", true); 00054 setctrlState("mrs_bool/samplingRateAdjustmentMode",(mrs_bool)true); 00055 } 00056 00057 void 00058 ResampleLinear::myUpdate(MarControlPtr sender) 00059 { 00060 MarSystem::myUpdate(sender); 00061 MRSDIAG("ResampleLinear.cpp - ResampleLinear:myUpdate"); 00062 mrs_real alpha = ctrl_stretch_->to<mrs_real>(); 00063 ctrl_onSamples_->setValue((mrs_natural) (alpha * ctrl_inSamples_->to<mrs_natural>()), NOUPDATE); 00064 ctrl_onObservations_->setValue(ctrl_inObservations_->to<mrs_natural>()); 00065 00066 if (!(ctrl_samplingRateAdjustmentMode_->to<mrs_bool>())) 00067 { 00068 alpha=1.0; 00069 } 00070 00071 ctrl_osrate_->setValue(ctrl_israte_->to<mrs_real>()*alpha); 00072 00073 mrs_string inObsNames = ctrl_inObsNames_->to<mrs_string>(); 00074 // Add prefix to the observation names. 00075 ctrl_onObsNames_->setValue(obsNamesAddPrefix(inObsNames, "ResampleLinear_"), NOUPDATE); 00076 00077 } 00078 00079 void 00080 ResampleLinear::myProcess(realvec& in, realvec& out) 00081 { 00082 mrs_real tp; 00083 mrs_natural tl, tr; 00084 mrs_real alpha = ctrl_stretch_->to<mrs_real>(); 00085 mrs_natural o,t; 00086 00087 for (o=0; o < onObservations_; o++) 00088 { 00089 for (t = 0; t < onSamples_; t++) 00090 { 00091 tp = t / alpha; 00092 tl= (mrs_natural)tp; 00093 tr = tl + 1; 00094 if (tr<inSamples_) // check tr because tr == inSamples_ might happen 00095 { 00096 out(o,t) = (tr-tp) * in(o,tl) + (tp-tl) * in(o,tr); 00097 } 00098 else // reflect on boundary 00099 { 00100 out(o,t) = in(o,inSamples_-1); // alternative possibilities would include: 00101 00102 //periodic on boundary: 00103 //out(o,t) = in(o,0); 00104 00105 //zero pad on boundary: 00106 //out(o,t) == 0; 00107 } 00108 } 00109 } 00110 }