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Level Meter: changed rms to avg to be generic

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This commit is contained in:
f4exb
2016-12-04 06:44:37 +01:00
parent 373a99e575
commit 76932e6627
2 changed files with 11 additions and 9 deletions
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sdrbase/gui/levelmeter.cpp
+8 -7
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@@ -4,6 +4,7 @@
* - use the widget horizontally
* - differentiate each area with a different color
* - allow overload by 25% with indication of 100% threshold and overload
* - make it generic to fit many cases: VU, signal strength ...
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
@@ -58,13 +59,13 @@ const int PeakHoldLevelDuration = 2000; // ms
LevelMeter::LevelMeter(QWidget *parent)
: QWidget(parent)
, m_rmsLevel(0.0)
, m_avgLevel(0.0)
, m_peakLevel(0.0)
, m_decayedPeakLevel(0.0)
, m_peakDecayRate(PeakDecayRate)
, m_peakHoldLevel(0.0)
, m_redrawTimer(new QTimer(this))
, m_rmsColor(QColor(0x97, 0x54, 0x00)) // color mapper 59%
, m_avgColor(QColor(0x97, 0x54, 0x00)) // color mapper 59%
, m_decayedPeakColor(QColor(0xff, 0x8b, 0x00)) // color mapper foreground
, m_peakColor(255, 0, 0, 255) // just red
{
@@ -82,16 +83,16 @@ LevelMeter::~LevelMeter()
void LevelMeter::reset()
{
m_rmsLevel = 0.0;
m_avgLevel = 0.0;
m_peakLevel = 0.0;
update();
}
void LevelMeter::levelChanged(qreal rmsLevel, qreal peakLevel, int numSamples)
void LevelMeter::levelChanged(qreal avgLevel, qreal peakLevel, int numSamples)
{
// Smooth the RMS signal
const qreal smooth = pow(qreal(0.9), static_cast<qreal>(numSamples) / 256); // TODO: remove this magic number
m_rmsLevel = (m_rmsLevel * smooth) + (rmsLevel * (1.0 - smooth));
m_avgLevel = (m_avgLevel * smooth) + (avgLevel * (1.0 - smooth));
if (peakLevel > m_decayedPeakLevel) {
m_peakLevel = peakLevel;
@@ -172,6 +173,6 @@ void LevelMeterVU::render(QPainter *painter)
bar.setRight(rect().right() - (1.0 - 0.75*m_decayedPeakLevel) * rect().width());
painter->fillRect(bar, m_decayedPeakColor);
bar.setRight(rect().right() - (1.0 - 0.75*m_rmsLevel) * rect().width());
painter->fillRect(bar, m_rmsColor);
bar.setRight(rect().right() - (1.0 - 0.75*m_avgLevel) * rect().width());
painter->fillRect(bar, m_avgColor);
}