Method tickMeters

src/gui/StripFinalOutputPanel.cpp:1131–1269

}

void StripFinalOutputPanel::tickMeters()
{
    if (!m_audio) return;
    auto* lim = m_audio->clientFinalLimiterTx();
    if (!lim) return;

    const float inPeak   = lim->inputPeakDb();
    const float outPeak  = lim->outputPeakDb();
    const float outRms   = lim->outputRmsDb();
    const float gr       = lim->gainReductionDb();
    const bool  active   = lim->active();
    const float activity = lim->limiterActivityPct();
    const quint64 clipCount = lim->clipPreLimiterCount();

    // Feed the smoothers in normalised [0, 1] space — setTarget every
    // tick with the latest accessor value, no "only rise" guard.  The
    // smoother's asymmetric attack/release does the right thing on
    // its own (matches ClientCompMeter, ClientCompApplet, etc.).
    // GR is mapped via -gr/30 so a 30 dB cut reads as a full bar
    // (matches the existing red-fill overlay scale in HorizMeter).
    auto dbRatio = [](float db) {
        if (db <= kMeterMinDb) return 0.0f;
        if (db >= kMeterMaxDb) return 1.0f;
        return (db - kMeterMinDb) / (kMeterMaxDb - kMeterMinDb);
    };
    m_inPeakSmooth.setTarget(dbRatio(inPeak));
    m_outPeakSmooth.setTarget(dbRatio(outPeak));
    m_outRmsSmooth.setTarget(dbRatio(outRms));
    m_grSmooth.setTarget(std::clamp(-gr / 30.0f, 0.0f, 1.0f));

    const qint64 dt = m_animClock.restart();
    m_inPeakSmooth.tick(dt);
    m_outPeakSmooth.tick(dt);
    m_outRmsSmooth.tick(dt);
    m_grSmooth.tick(dt);

    constexpr float kRange = kMeterMaxDb - kMeterMinDb;
    m_inPeakDb  = kMeterMinDb + m_inPeakSmooth.value()  * kRange;
    m_outPeakDb = kMeterMinDb + m_outPeakSmooth.value() * kRange;
    m_outRmsDb  = kMeterMinDb + m_outRmsSmooth.value()  * kRange;
    m_grDb      = -m_grSmooth.value() * 30.0f;

    m_active = active;

    // OVR latch — clip count is monotonic; any increase since last
    // tick lights the LED for ~1.5 s.
    const qint64 nowMs = QDateTime::currentMSecsSinceEpoch();
    if (clipCount > m_lastClipCount) {
        m_ovrLatchUntilMs = nowMs + 1500;
        m_lastClipCount = clipCount;
    }
    const bool ovrActive = nowMs < m_ovrLatchUntilMs;

    auto fmtDb = [](float v) {
        if (v <= -100.0f) return QString("-∞");
        return QString::number(v, 'f', 1);
    };
    // Peak-hold latches worst-case-since-engaged (#2887). PK / RMS