SpectralDelay.cxx

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/*
 * Copyright (c) 2001-2004 MUSIC TECHNOLOGY GROUP (MTG)
 *                         UNIVERSITAT POMPEU FABRA
 *
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include "SpectralDelay.hxx"
#include "ProcessingFactory.hxx"

namespace CLAM
{

namespace Hidden
{
        static const char * metadata[] = {
                "key", "SpectralDelay",
                "category", "Spectral Transformations",
                "description", "SpectralDelay",
                0
        };
        static FactoryRegistrator<ProcessingFactory, SpectralDelay> reg = metadata;
}



bool SpectralDelay::Do(const Spectrum& in, Spectrum& out)
{
        if ( !mConfig.GetPreserveOuts() )
        {
                out = in; //TODO big cludge for streaming
        }
        
        //first convert from ms to token size
        //mFrameSize should  be set somehow in the configuration! It is the difference between one frame center and the next
        mFrameSize = 1024;
        
        
        TData lfDelay = mLowDelayCtl.GetLastValue() * in.GetSpectralRange() * 0.002 / mFrameSize;
        TData mfDelay = mMidDelayCtl.GetLastValue() * in.GetSpectralRange() * 0.002 / mFrameSize;
        TData hfDelay = mHighDelayCtl.GetLastValue() * in.GetSpectralRange() * 0.002 / mFrameSize;
        
        //these controls could just be connected at the beginning
        SendFloatToInControl(mLFDelay,"Delay Control",lfDelay);
        SendFloatToInControl(mMFDelay,"Delay Control",mfDelay);
        SendFloatToInControl(mHFDelay,"Delay Control",hfDelay);
        
        //now we are ready to get the appropriate spectrums
        mLFDelay.Do(in, mLFSpectrum);
        mMFDelay.Do(in, mMFSpectrum);
        mHFDelay.Do(in, mHFSpectrum);
        
        DataArray& hfMag = mHFSpectrum.GetMagBuffer();
        DataArray& hfPhase = mHFSpectrum.GetPhaseBuffer();
        DataArray& mfMag = mMFSpectrum.GetMagBuffer();
        DataArray& mfPhase = mMFSpectrum.GetPhaseBuffer();
        DataArray& lfMag = mLFSpectrum.GetMagBuffer();
        DataArray& lfPhase = mLFSpectrum.GetPhaseBuffer();
        
        DataArray& oMag = out.GetMagBuffer();
        DataArray& oPhase = out.GetPhaseBuffer();
        
        int spectrumSize = in.GetSize();
        
        TData spectralResolution = spectrumSize/in.GetSpectralRange();
        
        int lowCutoff = Round(mLowCutoffFreqCtl.GetLastValue()* spectralResolution);
        int highCutoff = Round(mHighCutoffFreqCtl.GetLastValue()* spectralResolution);

        for(int i = 0; i<spectrumSize; i++)
        {
                if(i>highCutoff) 
                {
                        oMag[i] = hfMag[i];
                        oPhase[i] = hfPhase[i];
                }
                else if(i>lowCutoff)
                {
                        oMag[i] = mfMag[i];
                        oPhase[i] = mfPhase[i];
                }
                else
                {
                        oMag[i] = lfMag[i];
                        oPhase[i] = lfPhase[i];
                }
        }
        return true;
}


}