FreqShift.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 "FreqShift.hxx"
00023 #include "ProcessingFactory.hxx"
00024 
00025 namespace CLAM
00026 {
00027 
00028 namespace Hidden
00029 {
00030         static const char * metadata[] = {
00031                 "key", "FreqShift",
00032         //      "category", "Spectral Transformations",
00033         //      "description", "FreqShift",
00034                 0
00035         };
00036         static FactoryRegistrator<ProcessingFactory, FreqShift> reg = metadata;
00037 }
00038 
00039 
00040 bool FreqShift::Do(const Spectrum& in, Spectrum& out)
00041 {
00042 
00043         if ( !mConfig.GetPreserveOuts() )
00044         {
00045                 out = in; //TODO big cludge for streaming
00046         }
00047 
00048         //xamat: todo, we just hope the spectrum is in mag/phase format
00049         DataArray& iMagArray =  in.GetMagBuffer();
00050         DataArray& iPhaseArray = in.GetPhaseBuffer();
00051         TSize spectrumSize = in.GetSize();
00052         //I need to keep a copy of the magnitude array to guarantee inplace processing is possible
00053         mOMagArray.Resize(spectrumSize);
00054         mOMagArray.SetSize(spectrumSize);
00055         mOPhaseArray.Resize(spectrumSize);
00056         mOPhaseArray.SetSize(spectrumSize);
00057         
00058         //actually this is one over the spectral resolution, but it will be better for what I need afterwords
00059         TData spectralResolution = spectrumSize/in.GetSpectralRange();
00060         int amount = Round(mShiftAmount.GetLastValue() * spectralResolution);
00061         
00062         for(int i = 0; i<spectrumSize; i++)
00063         {
00064                 if(i<amount)
00065                 {
00066                         mOMagArray[i] = 0;
00067                         mOPhaseArray[i] = 0;
00068                 }
00069                 else if(i>spectrumSize+amount)
00070                 {
00071                         mOMagArray[i] = 0;
00072                         mOPhaseArray[i] = 0;
00073                 }
00074                 else
00075                 {
00076                         mOMagArray[i] = iMagArray[i-amount];
00077                         mOPhaseArray[i] = iPhaseArray[i-amount];
00078                 }
00079         }
00080         out.SetMagBuffer(mOMagArray);
00081         out.SetPhaseBuffer(mOPhaseArray);
00082         return true;
00083 }
00084 
00085 
00086 }
00087 
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