Function runSweep

tests/profile/audio/pitch_sweep_test.cpp:131–173

--------------------------------------------------------------------------- Run a single sweep for one (mode, window) pair Sweeps from fmin to sweepMax (Nyquist) in log-spaced steps. Points where inputFreq > fmax are marked as out-of-band. ---------------------------------------------------------------------------

// Points where inputFreq > fmax are marked as out-of-band.
// ---------------------------------------------------------------------------
static void runSweep(Mode mode, Window window,
                     int samples, int bands, float fmin, float fmax,
                     int sampleRate, int numSteps,
                     fl::vector<SweepPoint> &out) {
    Args args(samples, bands, fmin, fmax, sampleRate, mode, window);
    Impl fft(args);
    Bins bins(bands);
    fl::vector<fl::i16> signal;

    // Sweep from fmin to Nyquist in log-spaced steps
    float nyquist = static_cast<float>(sampleRate) / 2.0f;
    float logMin = fl::logf(fmin);
    float logMax = fl::logf(nyquist);

    int prevPeakBin = -1;
    float prevPeakFreq = -1.0f;

    out.clear();
    for (int step = 0; step < numSteps; step++) {
        float t = static_cast<float>(step) / static_cast<float>(numSteps - 1);
        float freq = fl::expf(logMin + t * (logMax - logMin));

        generateSine(signal, samples, sampleRate, freq);
        fft.run(signal, &bins);

        int peak = peakBin(bins.raw());
        float peakFreq = bins.binToFreq(peak);
        float conc = energyConcentration(bins.raw(), peak);

        SweepPoint pt;
        pt.inputFreq = freq;
        pt.peakBinIdx = peak;
        pt.peakBinFreq = peakFreq;
        pt.concentration = conc;
        pt.monotonic = (peak >= prevPeakBin);
        pt.aliased = (prevPeakFreq > 0.0f && peakFreq < prevPeakFreq * 0.8f);
        pt.inBand = (freq <= fmax);

        out.push_back(pt);
        prevPeakBin = peak;
        prevPeakFreq = peakFreq;
    }
}

// ---------------------------------------------------------------------------
// Compute summary stats for a subset of sweep points