updateSpectralFlux()

void fl::audio::Reactive::updateSpectralFlux ( )

private

Definition at line 621 of file audio_reactive.cpp.hpp.

                                  {
    // Compute spectral flux from Reactive's own previous magnitudes.
    //
    // IMPORTANT ordering contract (called from processSample):
    //   Step 7: updateSpectralFlux()   — uses & updates Reactive::mPreviousMagnitudes
    //   Step 9: detectEnhancedBeats()  — calls SpectralFluxDetector::detectOnset()
    //           which uses & updates SpectralFluxDetector::mPreviousMagnitudes
    //
    // Both arrays converge to the same values (both set to mCurrentData.frequencyBins
    // each frame), but they are separate to avoid a state-ordering bug: calling
    // mSpectralFluxDetector->calculateSpectralFlux() here would update the
    // detector's internal state and cause detectOnset() to see zero flux.
    float flux = 0.0f;
    for (int i = 0; i < 16; ++i) {
        float diff = mCurrentData.frequencyBins[i] - mPreviousMagnitudes[i];
        if (diff > 0.0f) {
            flux += diff;
        }
    }
    mCurrentData.spectralFlux = flux;
 
    // Update previous magnitudes for next frame
    for (int i = 0; i < 16; ++i) {
        mPreviousMagnitudes[i] = mCurrentData.frequencyBins[i];
    }
}

References mCurrentData, and mPreviousMagnitudes.

Referenced by processSample().

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