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 "Differentiator.h" 00020 #include "../common_source.h" 00021 00022 using std::ostringstream; 00023 using namespace Marsyas; 00024 00025 Differentiator::Differentiator(mrs_string name):MarSystem("Differentiator", name) 00026 { 00027 } 00028 00029 Differentiator::Differentiator(const Differentiator& a) : MarSystem(a) 00030 { 00031 } 00032 00033 00034 Differentiator::~Differentiator() 00035 { 00036 } 00037 00038 MarSystem* 00039 Differentiator::clone() const 00040 { 00041 return new Differentiator(*this); 00042 } 00043 00044 void 00045 Differentiator::myUpdate(MarControlPtr sender) 00046 { 00047 MRSDIAG("Differentiator.cpp - Differentiator:myUpdate"); 00048 00049 // Use the default matching of the output slice format and rate 00050 // with the input slice format and rate. 00051 MarSystem::myUpdate(sender); 00052 00053 // Allocate the buffer_ based on inObservations. 00054 buffer_.stretch(inObservations_); 00055 buffer_.setval(0); 00056 } 00057 00058 void 00059 Differentiator::myProcess(realvec& in, realvec& out) 00060 { 00061 mrs_natural t,o; 00062 for (o=0; o < inObservations_; o++) 00063 { 00064 // Calculate the difference of the first sample with the last sample of 00065 // the previous slice. 00066 out(o,0) = in(o,0) - buffer_(o); 00067 // Calculate the differences for the other samples. 00068 for (t = 1; t < inSamples_; t++) 00069 { 00070 out(o, t) = in(o, t) - in(o, t-1); 00071 } 00072 // Store the last sample in the buffer. 00073 buffer_(o) = in(o, inSamples_-1); 00074 } 00075 }