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VolumeFader::VolumeFader()
{
peak = 0;
volslider = new QSlider();
volslider->setRange(-60 * SCALAR , 10 * SCALAR);
volslider->setOrientation(Qt::Horizontal);
volumepeak = new QLabel();
volume = new QLabel();
connect(volslider, SIGNAL(valueChanged(int)), this, SLOT(handleValueChanged()));
QVBoxLayout* lo = new QVBoxLayout();
lo->addWidget(volslider);
lo->addWidget(volumepeak);
lo->addWidget(volume);
setLayout(lo);
}
VolumeFader::~VolumeFader()
{
}
void VolumeFader::updatePeakDb(double db)
{
}
void VolumeFader::updatePeakPower(double newpeak)
{
peak = (newpeak * (1.0-P) + peak * P);
volumepeak->setText("Peak " + QString::number(peak, 'f', 5));
handleValueChanged();
}
void VolumeFader::setVolumeDb(double db)
{
volslider->setValue(db*SCALAR);
handleValueChanged();
}
void VolumeFader::setVolumePower(double power)
{
double db = 20 * log10(power);
setVolumeDb(db);
handleValueChanged();
}
void VolumeFader::handleValueChanged()
{
double db = ((double)volslider->value())/((double)SCALAR);
double power = pow(10, db/20);
emit volumeChangedDb(db);
emit volumeChangedPower(power);
volume->setText("Gain " + QString::number(volslider->value()/SCALAR) + " dB");
}
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