getHistoricalFFT()

const fft::Bins * fl::audio::Context::getHistoricalFFT

(

int

framesBack

)

const

Definition at line 120 of file audio_context.cpp.hpp.

                                                             {
    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];
}

References mFFTHistory, and mFFTHistoryIndex.