CLAM-Development
1.1
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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