Method mapBins

src/fl/audio/frequency_bin_mapper.cpp.hpp:121–165

}

void FrequencyBinMapper::mapBins(span<const float> fftBins, span<float> outputBins) const {
    const size numBins = static_cast<size>(mConfig.mode);

    // Validate output buffer size
    if (outputBins.size() < numBins) {
        FL_WARN("FrequencyBinMapper: output buffer too small (" << outputBins.size()
                << " < " << numBins << ")");
        return;
    }

    // Track maximum magnitude for stats
    float maxMag = 0.0f;
    u32 fftBinsUsed = 0;

    // Map fft::FFT bins to frequency bins by averaging
    for (size i = 0; i < numBins; ++i) {
        const BinMapping& mapping = mBinMappings[i];

        float sum = 0.0f;
        u32 count = 0;

        // Average fft::FFT bins in this range
        for (u32 j = mapping.startBin; j < mapping.endBin && j < fftBins.size(); ++j) {
            sum += fftBins[j];
            ++count;
            ++fftBinsUsed;

            if (fftBins[j] > maxMag) {
                maxMag = fftBins[j];
            }
        }

        // Calculate average
        if (count > 0) {
            outputBins[i] = sum / static_cast<float>(count);
        } else {
            outputBins[i] = 0.0f;
        }
    }

    // Update stats (mutable in const method for statistics)
    const_cast<FrequencyBinMapper*>(this)->mStats.binMappingCount++;
    const_cast<FrequencyBinMapper*>(this)->mStats.lastFFTBinsUsed = fftBinsUsed;
    const_cast<FrequencyBinMapper*>(this)->mStats.maxMagnitude = maxMag;
}

float FrequencyBinMapper::getBassEnergy(span<const float> frequencyBins) const {
    if (frequencyBins.size() < BASS_BIN_END) {