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042f8ac325
Add peak indicators to the mixer strips. They show the maximum peak value that was observed and can be reset by clicking on them. ## Implementation details The implementation works via a signal/slot mechanism. The `Fader` class has a new signal `peakChanged` which reports peak values as amplifications. A new class `PeakIndicator` is added which has a slot `updatePeak` which is connected to the new signal in `Fader`. The `PeakIndicator` inherits from `QLabel` and mainly deals with updating the label text from the current peak value. Add a `PeakIndicator` instance to `MixerChannelView`. Add a `reset` method to `MixerChannelView` so that the mixer channel can be reset on the loading of new projects, etc. The current implementation resets the peak indicator back to -inf dbFS. The `reset` method is called in `MixerView::clear`. Remove the clamping in `Fader::setPeak` so that all peaks are reported. Emit the new signal if the peak changes.
85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
/*
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* PeakIndicator.cpp - Peak indicator widget
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*
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* Copyright (c) 2024- Michael Gregorius
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*
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* This file is part of LMMS - https://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#include "PeakIndicator.h"
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#include "lmms_math.h"
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#include <QBoxLayout>
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#include <QMouseEvent>
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namespace lmms::gui
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{
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PeakIndicator::PeakIndicator(QWidget* parent) :
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QLabel(parent),
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m_peak(0.f)
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{
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setAlignment(Qt::AlignCenter);
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updatePeakDisplay();
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}
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void PeakIndicator::resetPeakToMinusInf()
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{
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m_peak = 0;
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updatePeakDisplay();
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}
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void PeakIndicator::updatePeak(float peak)
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{
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if (peak > m_peak)
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{
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m_peak = peak;
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updatePeakDisplay();
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}
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}
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void PeakIndicator::mousePressEvent(QMouseEvent* e)
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{
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if (e->buttons() & Qt::LeftButton)
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{
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resetPeakToMinusInf();
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}
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}
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void PeakIndicator::updatePeakDisplay()
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{
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// Treat everything below -144 dbFS as -inf. Otherwise some residual signals show up
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// in the form of very small dbFS values, e.g. -857.1 dbFS.
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// TODO Make the threshold configurable in the settings?
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if (m_peak <= dbfsToAmp(-144.))
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{
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setText(tr("-inf"));
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}
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else
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{
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auto dbfs = ampToDbfs(m_peak);
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setText(QString::number(dbfs, 'f', 1));
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}
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}
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} // namespace lmms::gui
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