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 "TimeStretch.h" 00020 00021 using namespace std; 00022 using namespace Marsyas; 00023 00024 TimeStretch::TimeStretch(mrs_string name):MarSystem("TimeStretch",name) 00025 { 00026 //type_ = "TimeStretch"; 00027 //name_ = name; 00028 00029 addControls(); 00030 } 00031 00032 TimeStretch::~TimeStretch() 00033 { 00034 } 00035 00036 MarSystem* 00037 TimeStretch::clone() const 00038 { 00039 return new TimeStretch(*this); 00040 } 00041 00042 void 00043 TimeStretch::addControls() 00044 { 00045 addctrl("mrs_real/factor", 1.0); 00046 } 00047 00048 void 00049 TimeStretch::myProcess(realvec& in, realvec& out) 00050 { 00051 //checkFlow(in,out); 00052 mrs_real factor = getctrl("mrs_real/factor")->to<mrs_real>(); 00053 mrs_natural inSamples = getctrl("mrs_natural/inSamples")->to<mrs_natural>(); 00054 00055 for (mrs_natural t=0; t < inSamples; t++) 00056 { 00057 // linear interpolation 00058 ni = t* factor; 00059 li = ((unsigned long)ni) % inSamples; 00060 ri = li + 1; 00061 00062 w_ = ni - li; 00063 if (ri < inSamples) 00064 out(0,t) = in(li) + w_ * (in(0,ri) - in(0,li)); 00065 else 00066 out(0,t) = in(li); 00067 } 00068 } 00069 00070 00071 00072 00073 00074 00075 00076 00077