RandomPhase.cxx

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00001 /*
00002  * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
00003  *                         UNIVERSITAT POMPEU FABRA
00004  *
00005  *
00006  * This program is free software; you can redistribute it and/or modify
00007  * it under the terms of the GNU General Public License as published by
00008  * the Free Software Foundation; either version 2 of the License, or
00009  * (at your option) any later version.
00010  *
00011  * This program is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014  * GNU General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU General Public License
00017  * along with this program; if not, write to the Free Software
00018  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00019  *
00020  */
00021 
00022 #include "RandomPhase.hxx"
00023 #include "ProcessingFactory.hxx"
00024 
00025 namespace CLAM
00026 {
00027 namespace Hidden
00028 {
00029         static const char * metadata[] = {
00030                 "key", "RandomPhase",
00031         //      "category", "Spectral Transformations",
00032         //      "description", "RandomPhase",
00033                 0
00034         };
00035         static FactoryRegistrator<ProcessingFactory, RandomPhase> reg = metadata;
00036 }
00037 
00038 
00039 bool RandomPhase::Do(const Spectrum& in, Spectrum& out)
00040 {
00041         srand(time(0));
00042 
00043         out = in; 
00044 
00045         float amount = mAmount.GetLastValue() * 0.01;
00046         float invAmount = 1. - amount;
00047         DataArray& oPhase = out.GetPhaseBuffer();
00048         
00049         int spectrumSize = in.GetSize();
00050         
00051         int k = TWO_PI / RAND_MAX;
00052         for(int i = 0; i<spectrumSize; i++)
00053         {
00054                 oPhase[i] = oPhase[i]*invAmount + rand()* k * amount;
00055         }
00056         return true;
00057 }
00058 
00059 
00060 
00061 }
00062 
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