WeightingFilter.cpp

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#include "WeightingFilter.h"
 
//=====================================================================================
krotos::WeightingFilter::WeightingFilter()
{
    //
}
 
//=====================================================================================
void krotos::WeightingFilter::configure(double rate, FilterType filter_type)
{
 
    switch (filter_type)
    {
    case krotos::WeightingFilter::FilterType::KWeighting: {
        // K filtering as specified in EBU R-128 / ITU BS.1770-4
        // https://github.com/BrechtDeMan/loudness.py/blob/master/loudness.py
        // https://github.com/csteinmetz1/pyloudnorm/blob/master/pyloudnorm/meter.py
 
        m_highShelf.configure(rate, krotos::BiquadFilter::FilterType::HighShelfDeMan);
        m_highPass.configure(rate, krotos::BiquadFilter::FilterType::HighPassDeMan);
 
        configured = true;
 
        break;
    }
    }
}
 
//=====================================================================================
float krotos::WeightingFilter::processSample(float x)
{
    assert(configured);
 
    x = m_highShelf.processSample(x);
    x = m_highPass.processSample(x);
 
    return x;
}