mapFFTBinsToFrequencyChannels()

void fl::AudioReactive::mapFFTBinsToFrequencyChannels ( )

private

Definition at line 102 of file audio_reactive.cpp.

                                                  {
    // Copy FFT results to frequency bins array
    for (int i = 0; i < 16; ++i) {
        if (i < static_cast<int>(mFFTBins.bins_raw.size())) {
            mCurrentData.frequencyBins[i] = mFFTBins.bins_raw[i];
        } else {
            mCurrentData.frequencyBins[i] = 0.0f;
        }
    }
    
    // Apply pink noise compensation (from WLED)
    for (int i = 0; i < 16; ++i) {
        mCurrentData.frequencyBins[i] *= PINK_NOISE_COMPENSATION[i];
    }
    
    // Find dominant frequency
    float maxMagnitude = 0.0f;
    int maxBin = 0;
    for (int i = 0; i < 16; ++i) {
        if (mCurrentData.frequencyBins[i] > maxMagnitude) {
            maxMagnitude = mCurrentData.frequencyBins[i];
            maxBin = i;
        }
    }
    
    // Convert bin index to approximate frequency
    // Rough approximation based on WLED frequency mapping
    const float binCenterFrequencies[16] = {
        64.5f,   // Bin 0: 43-86 Hz
        107.5f,  // Bin 1: 86-129 Hz  
        172.5f,  // Bin 2: 129-216 Hz
        258.5f,  // Bin 3: 216-301 Hz
        365.5f,  // Bin 4: 301-430 Hz
        495.0f,  // Bin 5: 430-560 Hz
        689.0f,  // Bin 6: 560-818 Hz
        969.0f,  // Bin 7: 818-1120 Hz
        1270.5f, // Bin 8: 1120-1421 Hz
        1658.0f, // Bin 9: 1421-1895 Hz
        2153.5f, // Bin 10: 1895-2412 Hz
        2713.5f, // Bin 11: 2412-3015 Hz
        3359.5f, // Bin 12: 3015-3704 Hz
        4091.5f, // Bin 13: 3704-4479 Hz
        5792.5f, // Bin 14: 4479-7106 Hz
        8182.5f  // Bin 15: 7106-9259 Hz
    };
    
    mCurrentData.dominantFrequency = binCenterFrequencies[maxBin];
    mCurrentData.magnitude = maxMagnitude;
}

References mCurrentData, mFFTBins, and PINK_NOISE_COMPENSATION.

Referenced by processFFT().

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