Function testStaticRatio

tests/client_comp_test.cpp:150–181

4:1 ratio, hard knee, threshold -20. Drive at -10 dBFS peak. Expected output peak: -20 + (10/4) = -17.5 dBFS steady-state. Uses long attack/release so the log-domain envelope settles to the peak instead of riding the 1kHz sine waveform.

// Uses long attack/release so the log-domain envelope settles to the
// peak instead of riding the 1kHz sine waveform.
void testStaticRatio()
{
    ClientComp comp;
    comp.prepare(kSampleRate);
    comp.setEnabled(true);
    comp.setThresholdDb(-20.0f);
    comp.setRatio(4.0f);
    comp.setKneeDb(0.0f);
    comp.setMakeupDb(0.0f);
    comp.setAttackMs(50.0f);
    comp.setReleaseMs(500.0f);
    comp.setLimiterEnabled(false);

    const float amp = std::pow(10.0f, -10.0f / 20.0f);  // -10 dBFS peak

    // Warmup: envelope τ = 500ms, settle over 3s.
    const int warm = static_cast<int>(kSampleRate) * 3;
    auto warmBuf = makeTone(1000.0, warm, amp);
    processBlocks(comp, warmBuf.data(), warm);

    const int frames = static_cast<int>(kSampleRate);
    auto buf = makeTone(1000.0, frames, amp);
    processBlocks(comp, buf.data(), frames);

    const float measPeak  = peakAbsStereo(buf.data(), frames);
    const float measDbfs  = linToDb(measPeak);
    const float errDb     = measDbfs - (-17.5f);
    report("4:1 ratio above threshold: -10 dBFS in -> -17.5 dBFS out",
           std::fabs(errDb) < 1.0f,
           "measured=" + std::to_string(measDbfs) + " dBFS, err="
               + std::to_string(errDb) + " dB");
}

// High ratio (20:1) clamps near threshold.
void testLimitRatio()