Method getHistoricalFFT

src/fl/audio/audio_context.cpp.hpp:120–130

}

const fft::Bins* Context::getHistoricalFFT(int framesBack) const {
    if (framesBack < 0 || framesBack >= static_cast<int>(mFFTHistory.size())) {
        return nullptr;
    }
    // Ring buffer lookup: walk backwards from the most-recently-written slot.
    // Adding history.size() before the modulo avoids negative values from
    // the subtraction, since C++ modulo of negative ints is implementation-defined.
    const int n = static_cast<int>(mFFTHistory.size());
    int index = (mFFTHistoryIndex - 1 - framesBack + n) % n;
    return &mFFTHistory[index];
}

void Context::setSample(const Sample& sample) {
    // Save current fft::FFT to history (use first cached entry if available)