filterio.cpp

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//=============================================================================================================
 
//=============================================================================================================
// INCLUDES
//=============================================================================================================
 
#include "filterio.h"
 
//=============================================================================================================
// QT INCLUDES
//=============================================================================================================
 
#include <QFile>
#include <QDebug>
#include <QStringList>
#include <QRegularExpression>
 
//=============================================================================================================
// USED NAMESPACES
//=============================================================================================================
 
using namespace RTPROCESSINGLIB;
using namespace Eigen;
 
//=============================================================================================================
// DEFINE MEMBER METHODS
//=============================================================================================================
 
FilterIO::FilterIO()
{
}
 
//=============================================================================================================
 
bool FilterIO::readFilter(QString path, FilterKernel &filter)
{
    //Open .txt file
    if(!path.contains(".txt"))
        return false;
 
    QFile file(path);
    if(!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug()<<"Error opening filter txt file for reading";
        return false;
    }
 
    //Start reading from file
    QTextStream in(&file);
    QVector<double> coefficientsTemp;
 
    while(!in.atEnd())
    {
        QString line = in.readLine();
 
        QStringList fields = line.split(QRegularExpression("\\s+"));
 
        //Delete last element if it is a blank character
        if(fields.at(fields.size()-1) == "")
            fields.removeLast();
 
        if(line.contains("#")) //Filter meta information commented areas in file
        {
            //Read filter sFreq
            if(line.contains("sFreq") && fields.size()==2)
                filter.setSamplingFrequency(fields.at(1).toDouble());
 
            //Read filter name
            if(line.contains("name")) {
                QString sFilterName;
                for(int i=1; i<fields.size(); i++)
                    sFilterName.append(fields.at(i));
                filter.setName(sFilterName);
            }
 
            //Read the filter order
            if(line.contains("order") && fields.size()==2)
                filter.setFilterOrder(fields.at(1).toInt());
 
            //Read the filter type
            if(line.contains("type") && fields.size()==2)
                filter.setFilterType(FilterKernel::m_filterTypes.indexOf(FilterParameter(fields.at(1))));
 
            //Read the filter LPFreq
            if(line.contains("LPFreq") && fields.size()==2)
                filter.setLowpassFreq(fields.at(1).toDouble());
 
            //Read the filter HPFreq
            if(line.contains("HPFreq") && fields.size()==2)
                filter.setHighpassFreq(fields.at(1).toDouble());
 
            //Read the filter CenterFreq
            if(line.contains("CenterFreq") && fields.size()==2)
                filter.setCenterFrequency(fields.at(1).toDouble());
 
            //Read the filter DesignMethod
            if(line.contains("DesignMethod") && fields.size()==2)
                filter.setDesignMethod(FilterKernel::m_designMethods.indexOf(FilterParameter(fields.at(1))));
 
        } else // Read filter coefficients
            coefficientsTemp.push_back(fields.join("").toDouble());
    }
    // Check if reading was successful and correct
    if(filter.getFilterOrder() != coefficientsTemp.size()) {
        filter.setFilterOrder(coefficientsTemp.size());
    }
 
    RowVectorXd vecCoeff = RowVectorXd::Zero(coefficientsTemp.size());
    for(int i=0; i < vecCoeff.cols(); i++) {
        vecCoeff(i) = coefficientsTemp.at(i);
    }
    filter.setCoefficients(vecCoeff);
 
    file.close();
 
    return true;
}
 
//=============================================================================================================
 
bool FilterIO::writeFilter(const QString &path, const FilterKernel &filter)
{
    // Open file dialog
    if(!path.isEmpty())
    {
        QFile file(path);
        if (!file.open(QIODevice::WriteOnly | QIODevice::Text)){
            qDebug()<<"Error opening filter txt file for writing";
            return false;
        }
 
        //Write coefficients to file
        QTextStream out(&file);
 
        out << "#sFreq " << filter.getSamplingFrequency() << "\n";
        out << "#name " << filter.getName() << "\n";
        out << "#type " << filter.getFilterType().getName() << "\n";
        out << "#order " << filter.getFilterOrder() << "\n";
        out << "#HPFreq " << filter.getHighpassFreq() << "\n";
        out << "#LPFreq " << filter.getLowpassFreq() << "\n";
        out << "#CenterFreq " << filter.getCenterFrequency() << "\n";
        out << "#DesignMethod " << filter.getDesignMethod().getName() << "\n";
 
        for(int i = 0 ; i<filter.getCoefficients().cols() ;i++)
            out << filter.getCoefficients()(i) << "\n";
 
        file.close();
 
        return true;
    }
 
    qDebug()<<"Error Filter File path is empty";
 
    return false;
}