SF_NormaliseArea.java

/* For Copyright and License see LICENSE.txt and COPYING.txt in the root directory */
package com.nerdscentral.audio.volume;

import com.nerdscentral.audio.core.SFSignal;
import com.nerdscentral.sython.Caster;
import com.nerdscentral.sython.SFMaths;
import com.nerdscentral.sython.SFPL_Operator;
import com.nerdscentral.sython.SFPL_RuntimeException;

/**
 * ?s1 Sf.Normalise !s1_normal... forwards an SFData normalised ...
 * 
 * @author AlexTu
 * 
 */

public class SF_NormaliseArea implements SFPL_Operator
{

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    @Override
    public Object Interpret(final Object input) throws SFPL_RuntimeException
    {
        SFSignal in = Caster.makeSFSignal(input);
        SFSignal data = Caster.makeSFSignal(input).replicateEmpty();
        // remove DC
        double dc = 0;
        int len = data.getLength();
        for (int i = 0; i < len; ++i)
        {
            dc += in.getSample(i);
        }
        dc = dc / len;
        for (int i = 0; i < len; ++i)
        {
            data.setSample(i, in.getSample(i) - dc);
        }
        double totalExcersion = 0;
        for (int i = 0; i < len; ++i)
        {
            totalExcersion += SFMaths.abs(data.getSample(i));
        }
        for (int i = 0; i < len; ++i)
        {
            data.setSample(i, data.getSample(i) / totalExcersion);
        }
        return data;
    }

    @Override
    public String Word()
    {
        return Messages.getString("SF_NormaliseArea.0"); //$NON-NLS-1$
    }

}