Method processBlock

src/fl/audio/audio.cpp.hpp:152–176

      mCurrentSpl(spl_floor) {}

void SoundLevelMeter::processBlock(const fl::i16 *samples, fl::size count) {
    // 1) compute block power → dBFS
    double sum_sq = 0.0;
    for (fl::size i = 0; i < count; ++i) {
        double s = samples[i] / 32768.0; // normalize to ±1
        sum_sq += s * s;
    }
    double p = sum_sq / count; // mean power
    double dbfs = 10.0 * log10(p + 1e-12);
    mCurrentDbfs = dbfs;

    // 2) update global floor (with optional smoothing)
    if (dbfs < mDbfsFloorGlobal) {
        if (mSmoothingAlpha <= 0.0) {
            mDbfsFloorGlobal = dbfs;
        } else {
            mDbfsFloorGlobal = mSmoothingAlpha * dbfs +
                                 (1.0 - mSmoothingAlpha) * mDbfsFloorGlobal;
        }
        mOffset = mSplFloor - mDbfsFloorGlobal;
    }

    // 3) estimate SPL
    mCurrentSpl = dbfs + mOffset;
}

void Sample::fft(fft::Bins *out) const {
    fl::span<const fl::i16> sample = pcm();