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 "3BandCompressor.hxx" 00023 #include "ProcessingFactory.hxx" 00024 00025 namespace CLAM 00026 { 00027 00028 namespace Hidden 00029 { 00030 static const char * metadata[] = { 00031 "key", "ThreeBandCompressor", 00032 "category", "Spectral Transformations", 00033 "description", "ThreeBandCompressor", 00034 0 00035 }; 00036 static FactoryRegistrator<ProcessingFactory, ThreeBandCompressor> reg = metadata; 00037 } 00038 00039 bool ThreeBandCompressor::Do(const Spectrum& in, Spectrum& out) 00040 { 00041 out = in; //even if out needs to be preserved, we need to copy content 00042 00043 DataArray& oMag = out.GetMagBuffer(); 00044 DataArray& iMag = in.GetMagBuffer(); 00045 00046 int spectrumSize = in.GetSize(); 00047 00048 TData spectralResolution = spectrumSize/in.GetSpectralRange(); 00049 00050 int lowCutoff = Round(mLowCutoffFreqCtl.GetLastValue()* spectralResolution); 00051 int highCutoff = Round(mHighCutoffFreqCtl.GetLastValue()* spectralResolution); 00052 00053 //note: control is supposed to be sent as dB's 00054 TData lowThreshold = log2lin(mLowThresholdCtl.GetLastValue()); 00055 TData midThreshold = log2lin(mMidThresholdCtl.GetLastValue()); 00056 TData highThreshold = log2lin(mHighThresholdCtl.GetLastValue()); 00057 00058 int i; 00059 TData currentThreshold = lowThreshold; 00060 for( i = 0; i<lowCutoff; i++) 00061 { 00062 if(iMag[i]>lowThreshold) 00063 oMag[i] = lowThreshold; 00064 } 00065 for( i = lowCutoff; i<highCutoff; i++) 00066 { 00067 if(iMag[i]>midThreshold) 00068 oMag[i] = midThreshold; 00069 } 00070 for( i = highCutoff; i<spectrumSize; i++) 00071 { 00072 if(iMag[i]>highThreshold) 00073 oMag[i] = highThreshold; 00074 } 00075 return true; 00076 } 00077 00078 00079 } 00080