view layer/SpectrumLayer.cpp @ 1386:fc3d89f88690 spectrogramparam

Use log-frequency rather than log-bin for calculating x coord in spectrum. This has the advantage that frequency positions don't move when we change the window size or oversampling ratio, but it does give us an unhelpfully large amount of space for very low frequencies - to be considered

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    This file copyright 2006-2007 QMUL.
    
    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.  See the file
    COPYING included with this distribution for more information.
*/

#include "SpectrumLayer.h"

#include "data/model/FFTModel.h"
#include "view/View.h"
#include "base/AudioLevel.h"
#include "base/Preferences.h"
#include "base/RangeMapper.h"
#include "base/Pitch.h"
#include "base/Strings.h"

#include "ColourMapper.h"
#include "PaintAssistant.h"
#include "PianoScale.h"
#include "HorizontalFrequencyScale.h"

#include <QPainter>
#include <QTextStream>


SpectrumLayer::SpectrumLayer() :
    m_originModel(0),
    m_channel(-1),
    m_channelSet(false),
    m_windowSize(4096),
    m_windowType(HanningWindow),
    m_windowHopLevel(3),
    m_oversampling(1),
    m_showPeaks(false),
    m_newFFTNeeded(true)
{
    Preferences *prefs = Preferences::getInstance();
    connect(prefs, SIGNAL(propertyChanged(PropertyContainer::PropertyName)),
            this, SLOT(preferenceChanged(PropertyContainer::PropertyName)));
    setWindowType(prefs->getWindowType());

    setBinScale(LogBins);
}

SpectrumLayer::~SpectrumLayer()
{
    Model *m = const_cast<Model *>
        (static_cast<const Model *>(m_sliceableModel));
    if (m) m->aboutToDelete();
    m_sliceableModel = 0;
    delete m;
}

void
SpectrumLayer::setModel(DenseTimeValueModel *model)
{
    SVDEBUG << "SpectrumLayer::setModel(" << model << ") from " << m_originModel << endl;
    
    if (m_originModel == model) return;

    m_originModel = model;

    if (m_sliceableModel) {
        Model *m = const_cast<Model *>
            (static_cast<const Model *>(m_sliceableModel));
        m->aboutToDelete();
        setSliceableModel(0);
        delete m;
    }

    m_newFFTNeeded = true;

    emit layerParametersChanged();
}

void
SpectrumLayer::setChannel(int channel)
{
    SVDEBUG << "SpectrumLayer::setChannel(" << channel << ") from " << m_channel << endl;
    
    m_channelSet = true;
    
    if (m_channel == channel) return;

    m_channel = channel;

    m_newFFTNeeded = true;

    emit layerParametersChanged();
}

void
SpectrumLayer::setupFFT()
{
    if (m_sliceableModel) {
        Model *m = const_cast<Model *>
            (static_cast<const Model *>(m_sliceableModel));
        m->aboutToDelete();
        setSliceableModel(0);
        delete m;
    }

    if (!m_originModel) {
        return;
    }

    int fftSize = getFFTSize();

    FFTModel *newFFT = new FFTModel(m_originModel,
                                    m_channel,
                                    m_windowType,
                                    m_windowSize,
                                    getWindowIncrement(),
                                    fftSize);

    setSliceableModel(newFFT);

    m_biasCurve.clear();
    for (int i = 0; i < fftSize; ++i) {
        m_biasCurve.push_back(1.f / (float(fftSize)/2.f));
    }

    m_newFFTNeeded = false;
}

Layer::PropertyList
SpectrumLayer::getProperties() const
{
    PropertyList list = SliceLayer::getProperties();
    list.push_back("Window Size");
    list.push_back("Window Increment");
    list.push_back("Oversampling");
    list.push_back("Show Peak Frequencies");
    return list;
}

QString
SpectrumLayer::getPropertyLabel(const PropertyName &name) const
{
    if (name == "Window Size") return tr("Window Size");
    if (name == "Window Increment") return tr("Window Overlap");
    if (name == "Oversampling") return tr("Oversampling");
    if (name == "Show Peak Frequencies") return tr("Show Peak Frequencies");
    return SliceLayer::getPropertyLabel(name);
}

QString
SpectrumLayer::getPropertyIconName(const PropertyName &name) const
{
    if (name == "Show Peak Frequencies") return "show-peaks";
    return SliceLayer::getPropertyIconName(name);
}

Layer::PropertyType
SpectrumLayer::getPropertyType(const PropertyName &name) const
{
    if (name == "Window Size") return ValueProperty;
    if (name == "Window Increment") return ValueProperty;
    if (name == "Oversampling") return ValueProperty;
    if (name == "Show Peak Frequencies") return ToggleProperty;
    return SliceLayer::getPropertyType(name);
}

QString
SpectrumLayer::getPropertyGroupName(const PropertyName &name) const
{
    if (name == "Window Size" ||
        name == "Window Increment" ||
        name == "Oversampling") return tr("Window");
    if (name == "Show Peak Frequencies") return tr("Bins");
    return SliceLayer::getPropertyGroupName(name);
}

int
SpectrumLayer::getPropertyRangeAndValue(const PropertyName &name,
                                        int *min, int *max, int *deflt) const
{
    int val = 0;

    int garbage0, garbage1, garbage2;
    if (!min) min = &garbage0;
    if (!max) max = &garbage1;
    if (!deflt) deflt = &garbage2;

    if (name == "Window Size") {

        *min = 0;
        *max = 15;
        *deflt = 5;
        
        val = 0;
        int ws = m_windowSize;
        while (ws > 32) { ws >>= 1; val ++; }

    } else if (name == "Window Increment") {
        
        *min = 0;
        *max = 5;
        *deflt = 2;
        
        val = m_windowHopLevel;
    
    } else if (name == "Oversampling") {

        *min = 0;
        *max = 3;
        *deflt = 0;

        val = 0;
        int ov = m_oversampling;
        while (ov > 1) { ov >>= 1; val ++; }
        
    } else if (name == "Show Peak Frequencies") {

        return m_showPeaks ? 1 : 0;

    } else {

        val = SliceLayer::getPropertyRangeAndValue(name, min, max, deflt);
    }

    return val;
}

QString
SpectrumLayer::getPropertyValueLabel(const PropertyName &name,
                                    int value) const
{
    if (name == "Window Size") {
        return QString("%1").arg(32 << value);
    }
    if (name == "Window Increment") {
        switch (value) {
        default:
        case 0: return tr("None");
        case 1: return tr("25 %");
        case 2: return tr("50 %");
        case 3: return tr("75 %");
        case 4: return tr("87.5 %");
        case 5: return tr("93.75 %");
        }
    }
    if (name == "Oversampling") {
        switch (value) {
        default:
        case 0: return tr("1x");
        case 1: return tr("2x");
        case 2: return tr("4x");
        case 3: return tr("8x");
        }
    }
    return SliceLayer::getPropertyValueLabel(name, value);
}

RangeMapper *
SpectrumLayer::getNewPropertyRangeMapper(const PropertyName &name) const
{
    return SliceLayer::getNewPropertyRangeMapper(name);
}

void
SpectrumLayer::setProperty(const PropertyName &name, int value)
{
    if (name == "Window Size") {
        setWindowSize(32 << value);
    } else if (name == "Window Increment") {
        setWindowHopLevel(value);
    } else if (name == "Oversampling") {
        setOversampling(1 << value);
    } else if (name == "Show Peak Frequencies") {
        setShowPeaks(value ? true : false);
    } else {
        SliceLayer::setProperty(name, value);
    }
}

void
SpectrumLayer::setWindowSize(int ws)
{
    if (m_windowSize == ws) return;
    m_windowSize = ws;
    m_newFFTNeeded = true;
    emit layerParametersChanged();
}

void
SpectrumLayer::setWindowHopLevel(int v)
{
    if (m_windowHopLevel == v) return;
    m_windowHopLevel = v;
    m_newFFTNeeded = true;
    emit layerParametersChanged();
}

void
SpectrumLayer::setWindowType(WindowType w)
{
    if (m_windowType == w) return;
    m_windowType = w;
    m_newFFTNeeded = true;
    emit layerParametersChanged();
}

void
SpectrumLayer::setOversampling(int oversampling)
{
    if (m_oversampling == oversampling) return;
    m_oversampling = oversampling;
    m_newFFTNeeded = true;
    emit layerParametersChanged();
}

int
SpectrumLayer::getOversampling() const
{
    return m_oversampling;
}

void
SpectrumLayer::setShowPeaks(bool show)
{
    if (m_showPeaks == show) return;
    m_showPeaks = show;
    emit layerParametersChanged();
}

void
SpectrumLayer::preferenceChanged(PropertyContainer::PropertyName name)
{
    if (name == "Window Type") {
        auto type = Preferences::getInstance()->getWindowType();
        SVDEBUG << "SpectrumLayer::preferenceChanged: Window type changed to "
                << type << endl;
        setWindowType(type);
        return;
    }
}

double
SpectrumLayer::getBinForFrequency(double freq) const
{
    if (!m_sliceableModel) return 0;
    double bin = (freq * getFFTSize()) / m_sliceableModel->getSampleRate();
    // we assume the frequency of a bin corresponds to the centre of
    // its visual range
    bin += 0.5;
    return bin;
}

double
SpectrumLayer::getBinForX(const LayerGeometryProvider *v, double x) const
{
    if (!m_sliceableModel) return 0;
    double bin = getBinForFrequency(getFrequencyForX(v, x));
    return bin;
}

double
SpectrumLayer::getFrequencyForX(const LayerGeometryProvider *v, double x) const
{
    if (!m_sliceableModel) return 0;
    double freq = getScalePointForX(v, x,
                                    getFrequencyForBin(m_minbin),
                                    getFrequencyForBin(m_maxbin));
    return freq;
}

double
SpectrumLayer::getFrequencyForBin(double bin) const
{
    if (!m_sliceableModel) return 0;
    // we assume the frequency of a bin corresponds to the centre of
    // its visual range
    bin -= 0.5;
    double freq = (bin * m_sliceableModel->getSampleRate()) / getFFTSize();
    return freq;
}

double
SpectrumLayer::getXForBin(const LayerGeometryProvider *v, double bin) const
{
    if (!m_sliceableModel) return 0;
    double x = getXForFrequency(v, getFrequencyForBin(bin));
    return x;
}

double
SpectrumLayer::getXForFrequency(const LayerGeometryProvider *v, double freq) const
{
    if (!m_sliceableModel) return 0;
    double x = getXForScalePoint(v, freq,
                                 getFrequencyForBin(m_minbin),
                                 getFrequencyForBin(m_maxbin));
    return x;
}

bool
SpectrumLayer::getXScaleValue(const LayerGeometryProvider *v, int x, 
                              double &value, QString &unit) const
{
    value = getFrequencyForX(v, x);
    unit = "Hz";
    return true;
}

bool
SpectrumLayer::getYScaleValue(const LayerGeometryProvider *v, int y,
                              double &value, QString &unit) const
{
    value = getValueForY(v, y);

    if (m_energyScale == dBScale || m_energyScale == MeterScale) {

        if (value > 0.0) {
            value = 10.0 * log10(value);
            if (value < m_threshold) value = m_threshold;
        } else value = m_threshold;

        unit = "dBV";

    } else {
        unit = "V";
    }

    return true;
}

bool
SpectrumLayer::getYScaleDifference(const LayerGeometryProvider *v, int y0, int y1,
                                   double &diff, QString &unit) const
{
    bool rv = SliceLayer::getYScaleDifference(v, y0, y1, diff, unit);
    if (rv && (unit == "dBV")) unit = "dB";
    return rv;
}


bool
SpectrumLayer::getCrosshairExtents(LayerGeometryProvider *v, QPainter &paint,
                                   QPoint cursorPos,
                                   std::vector<QRect> &extents) const
{
    QRect vertical(cursorPos.x(), cursorPos.y(), 1, v->getPaintHeight() - cursorPos.y());
    extents.push_back(vertical);

    QRect horizontal(0, cursorPos.y(), v->getPaintWidth(), 12);
    extents.push_back(horizontal);

    int hoffset = 2;
    if (m_binScale == LogBins) hoffset = 13;

    int sw = getVerticalScaleWidth(v, false, paint);

    QRect value(sw, cursorPos.y() - paint.fontMetrics().ascent() - 2,
                paint.fontMetrics().width("0.0000001 V") + 2,
                paint.fontMetrics().height());
    extents.push_back(value);

    QRect log(sw, cursorPos.y() + 2,
              paint.fontMetrics().width("-80.000 dBV") + 2,
              paint.fontMetrics().height());
    extents.push_back(log);

    QRect freq(cursorPos.x(),
               v->getPaintHeight() - paint.fontMetrics().height() - hoffset,
               paint.fontMetrics().width("123456 Hz") + 2,
               paint.fontMetrics().height());
    extents.push_back(freq);

    int w(paint.fontMetrics().width("C#10+50c") + 2);
    QRect pitch(cursorPos.x() - w,
                v->getPaintHeight() - paint.fontMetrics().height() - hoffset,
                w,
                paint.fontMetrics().height());
    extents.push_back(pitch);

    return true;
}

void
SpectrumLayer::paintCrosshairs(LayerGeometryProvider *v, QPainter &paint,
                               QPoint cursorPos) const
{
    if (!m_sliceableModel) return;

    paint.save();
    QFont fn = paint.font();
    if (fn.pointSize() > 8) {
        fn.setPointSize(fn.pointSize() - 1);
        paint.setFont(fn);
    }

    ColourMapper mapper(m_colourMap, m_colourInverted, 0, 1);
    paint.setPen(mapper.getContrastingColour());

    int xorigin = m_xorigins[v->getId()];
    paint.drawLine(xorigin, cursorPos.y(), v->getPaintWidth(), cursorPos.y());
    paint.drawLine(cursorPos.x(), cursorPos.y(), cursorPos.x(), v->getPaintHeight());
    
    double fundamental = getFrequencyForX(v, cursorPos.x());

    int hoffset = 2;
    if (m_binScale == LogBins) hoffset = 13;

    PaintAssistant::drawVisibleText(v, paint,
                                    cursorPos.x() + 2,
                                    v->getPaintHeight() - 2 - hoffset,
                                    QString("%1 Hz").arg(fundamental),
                                    PaintAssistant::OutlinedText);

    if (Pitch::isFrequencyInMidiRange(fundamental)) {
        QString pitchLabel = Pitch::getPitchLabelForFrequency(fundamental);
        PaintAssistant::drawVisibleText(v, paint,
                                        cursorPos.x() -
                                        paint.fontMetrics().width(pitchLabel) - 2,
                                        v->getPaintHeight() - 2 - hoffset,
                                        pitchLabel,
                                        PaintAssistant::OutlinedText);
    }

    double value = getValueForY(v, cursorPos.y());
    double thresh = m_threshold;
    double db = thresh;
    if (value > 0.0) db = 10.0 * log10(value);
    if (db < thresh) db = thresh;

    PaintAssistant::drawVisibleText(v, paint,
                       xorigin + 2,
                       cursorPos.y() - 2,
                       QString("%1 V").arg(value),
                       PaintAssistant::OutlinedText);

    PaintAssistant::drawVisibleText(v, paint,
                       xorigin + 2,
                       cursorPos.y() + 2 + paint.fontMetrics().ascent(),
                       QString("%1 dBV").arg(db),
                       PaintAssistant::OutlinedText);
    
    int harmonic = 2;

    while (harmonic < 100) {

        int hx = int(lrint(getXForFrequency(v, fundamental * harmonic)));

        if (hx < xorigin || hx > v->getPaintWidth()) break;
        
        int len = 7;

        if (harmonic % 2 == 0) {
            if (harmonic % 4 == 0) {
                len = 12;
            } else {
                len = 10;
            }
        }

        paint.drawLine(hx,
                       cursorPos.y(),
                       hx,
                       cursorPos.y() + len);

        ++harmonic;
    }

    paint.restore();
}

QString
SpectrumLayer::getFeatureDescription(LayerGeometryProvider *v, QPoint &p) const
{
    if (!m_sliceableModel) return "";

    int minbin = 0, maxbin = 0, range = 0;
    QString genericDesc = SliceLayer::getFeatureDescriptionAux
        (v, p, false, minbin, maxbin, range);

    if (genericDesc == "") return "";

    int i0 = minbin - m_minbin;
    int i1 = maxbin - m_minbin;
        
    float minvalue = 0.0;
    if (in_range_for(m_values, i0)) minvalue = m_values[i0];

    float maxvalue = minvalue;
    if (in_range_for(m_values, i1)) maxvalue = m_values[i1];
    
    if (minvalue > maxvalue) std::swap(minvalue, maxvalue);
    
    QString binstr;
    QString hzstr;
    int minfreq = int(lrint((minbin * m_sliceableModel->getSampleRate()) /
                            getFFTSize()));
    int maxfreq = int(lrint((std::max(maxbin, minbin)
                             * m_sliceableModel->getSampleRate()) /
                            getFFTSize()));

    if (maxbin != minbin) {
        binstr = tr("%1 - %2").arg(minbin+1).arg(maxbin+1);
    } else {
        binstr = QString("%1").arg(minbin+1);
    }
    if (minfreq != maxfreq) {
        hzstr = tr("%1 - %2 Hz").arg(minfreq).arg(maxfreq);
    } else {
        hzstr = tr("%1 Hz").arg(minfreq);
    }
    
    QString valuestr;
    if (maxvalue != minvalue) {
        valuestr = tr("%1 - %2").arg(minvalue).arg(maxvalue);
    } else {
        valuestr = QString("%1").arg(minvalue);
    }
    
    QString dbstr;
    double mindb = AudioLevel::multiplier_to_dB(minvalue);
    double maxdb = AudioLevel::multiplier_to_dB(maxvalue);
    QString mindbstr;
    QString maxdbstr;
    if (mindb == AudioLevel::DB_FLOOR) {
        mindbstr = Strings::minus_infinity;
    } else {
        mindbstr = QString("%1").arg(lrint(mindb));
    }
    if (maxdb == AudioLevel::DB_FLOOR) {
        maxdbstr = Strings::minus_infinity;
    } else {
        maxdbstr = QString("%1").arg(lrint(maxdb));
    }
    if (lrint(mindb) != lrint(maxdb)) {
        dbstr = tr("%1 - %2").arg(mindbstr).arg(maxdbstr);
    } else {
        dbstr = tr("%1").arg(mindbstr);
    }

    QString description;

    if (range > int(m_sliceableModel->getResolution())) {
        description = tr("%1\nBin:\t%2 (%3)\n%4 value:\t%5\ndB:\t%6")
            .arg(genericDesc)
            .arg(binstr)
            .arg(hzstr)
            .arg(m_samplingMode == NearestSample ? tr("First") :
                 m_samplingMode == SampleMean ? tr("Mean") : tr("Peak"))
            .arg(valuestr)
            .arg(dbstr);
    } else {
        description = tr("%1\nBin:\t%2 (%3)\nValue:\t%4\ndB:\t%5")
            .arg(genericDesc)
            .arg(binstr)
            .arg(hzstr)
            .arg(valuestr)
            .arg(dbstr);
    }
    
    return description;
}

void
SpectrumLayer::paint(LayerGeometryProvider *v, QPainter &paint, QRect rect) const
{
    if (!m_originModel || !m_originModel->isOK() ||
        !m_originModel->isReady()) {
        SVDEBUG << "SpectrumLayer::paint: no origin model, or origin model not OK or not ready" << endl;
        return;
    }

    if (m_newFFTNeeded) {
        SVDEBUG << "SpectrumLayer::paint: new FFT needed, calling setupFFT" << endl;
        const_cast<SpectrumLayer *>(this)->setupFFT(); //ugh
    }

    FFTModel *fft = dynamic_cast<FFTModel *>
        (const_cast<DenseThreeDimensionalModel *>(m_sliceableModel));

    double thresh = (pow(10, -6) / m_gain) * (getFFTSize() / 2.0); // -60dB adj

    int xorigin = getVerticalScaleWidth(v, false, paint) + 1;
    int scaleHeight = getHorizontalScaleHeight(v, paint);

    if (fft && m_showPeaks) {

        // draw peak lines

        int col = int(v->getCentreFrame() / fft->getResolution());

        paint.save();
        paint.setRenderHint(QPainter::Antialiasing, false);

        ColourMapper mapper =
            hasLightBackground() ?
            ColourMapper(ColourMapper::BlackOnWhite, m_colourInverted, 0, 1) :
            ColourMapper(ColourMapper::WhiteOnBlack, m_colourInverted, 0, 1);
        
        int peakminbin = 0;
        int peakmaxbin = fft->getHeight() - 1;
        double peakmaxfreq = Pitch::getFrequencyForPitch(128);
        peakmaxbin = int(((peakmaxfreq * fft->getHeight() * 2) / fft->getSampleRate()));
        
        FFTModel::PeakSet peaks = fft->getPeakFrequencies
            (FFTModel::MajorPitchAdaptivePeaks, col, peakminbin, peakmaxbin);

        BiasCurve curve;
        getBiasCurve(curve);
        int cs = int(curve.size());

        for (FFTModel::PeakSet::iterator i = peaks.begin();
             i != peaks.end(); ++i) {

            int bin = i->first;
            
//            cerr << "bin = " << bin << ", thresh = " << thresh << ", value = " << fft->getMagnitudeAt(col, bin) << endl;

            double value = fft->getValueAt(col, bin);
            if (value < thresh) continue;
            if (bin < cs) value *= curve[bin];
            
            double freq = i->second;
            int x = int(lrint(getXForFrequency(v, freq)));
            
            double norm = 0.f;
            // don't need return value, need norm:            
            (void)getYForValue(v, value, norm);

            paint.setPen(mapper.map(norm));
            paint.drawLine(x, 0, x, v->getPaintHeight() - scaleHeight - 1);
        }

        paint.restore();
    }
    
    paint.save();
    
    SliceLayer::paint(v, paint, rect);
    
    paintHorizontalScale(v, paint, xorigin);

    paint.restore();
}

int
SpectrumLayer::getHorizontalScaleHeight(LayerGeometryProvider *v,
                                        QPainter &paint) const
{
    int pkh = int(paint.fontMetrics().height() * 0.7 + 0.5);
    if (pkh < 10) pkh = 10;

    int scaleh = HorizontalFrequencyScale().getHeight(v, paint);

    return pkh + scaleh;
}

void
SpectrumLayer::paintHorizontalScale(LayerGeometryProvider *v,
                                    QPainter &paint,
                                    int xorigin) const
{
    //!!! All of this stuff relating to depicting frequencies
    // (keyboard, crosshairs etc) should be applicable to any slice
    // layer whose model has a vertical scale unit of Hz.  However,
    // the dense 3d model at the moment doesn't record its vertical
    // scale unit -- we need to fix that and hoist this code as
    // appropriate.  Same really goes for any code in SpectrogramLayer
    // that could be relevant to Colour3DPlotLayer with unit Hz, but
    // that's a bigger proposition.

    if (!v->getViewManager()->shouldShowHorizontalValueScale()) {
        return;
    }
    
    int totalScaleHeight = getHorizontalScaleHeight(v, paint); // inc piano
    int freqScaleHeight = HorizontalFrequencyScale().getHeight(v, paint);
    int paintHeight = v->getPaintHeight();
    int paintWidth = v->getPaintWidth();

    PianoScale().paintPianoHorizontal
        (v, this, paint,
         QRect(xorigin, paintHeight - totalScaleHeight - 1,
               paintWidth - 1, totalScaleHeight - freqScaleHeight));

    int scaleLeft = int(getXForBin(v, 1));
    
    paint.drawLine(int(getXForBin(v, 0)), paintHeight - freqScaleHeight,
                   scaleLeft, paintHeight - freqScaleHeight);

    QString hz = tr("Hz");
    int hzw = paint.fontMetrics().width(hz);
    if (scaleLeft > hzw + 5) {
        paint.drawText
            (scaleLeft - hzw - 5,
             paintHeight - freqScaleHeight + paint.fontMetrics().ascent() + 5,
             hz);
    }

    HorizontalFrequencyScale().paintScale
        (v, this, paint,
         QRect(scaleLeft, paintHeight - freqScaleHeight,
               paintWidth, totalScaleHeight),
         m_binScale == LogBins);
}

void
SpectrumLayer::getBiasCurve(BiasCurve &curve) const
{
    curve = m_biasCurve;
}

void
SpectrumLayer::toXml(QTextStream &stream,
                     QString indent, QString extraAttributes) const
{
    QString s = QString("windowSize=\"%1\" "
                        "windowHopLevel=\"%2\" "
                        "oversampling=\"%3\" "
                        "showPeaks=\"%4\" ")
        .arg(m_windowSize)
        .arg(m_windowHopLevel)
        .arg(m_oversampling)
        .arg(m_showPeaks ? "true" : "false");

    SliceLayer::toXml(stream, indent, extraAttributes + " " + s);
}

void
SpectrumLayer::setProperties(const QXmlAttributes &attributes)
{
    SliceLayer::setProperties(attributes);

    bool ok = false;

    int windowSize = attributes.value("windowSize").toUInt(&ok);
    if (ok) setWindowSize(windowSize);

    int windowHopLevel = attributes.value("windowHopLevel").toUInt(&ok);
    if (ok) setWindowHopLevel(windowHopLevel);

    int oversampling = attributes.value("oversampling").toUInt(&ok);
    if (ok) setOversampling(oversampling);

    bool showPeaks = (attributes.value("showPeaks").trimmed() == "true");
    setShowPeaks(showPeaks);
}