Method update

src/fl/audio/detector/key.cpp.hpp:118–189

}

void KeyDetector::update(shared_ptr<Context> context) {
    // Get fft::FFT data
    mRetainedFFT = context->getFFT(32);  // Use more bins for better pitch resolution
    const fft::Bins& fft = *mRetainedFFT;
    u32 timestamp = context->getTimestamp();

    // Extract chroma features
    float chroma[12] = {0};
    extractChroma(fft, chroma);
    normalizeChroma(chroma);

    // Update temporal averaging
    updateChromaHistory(chroma);

    // Get averaged chroma for stable detection
    float avgChroma[12] = {0};
    getAveragedChroma(avgChroma);

    // Detect key from averaged chroma
    Key detectedKey = detectKey(avgChroma, timestamp);

    // Update key duration if same key
    if (mKeyActive && detectedKey == mCurrentKey) {
        mCurrentKey.duration = timestamp - mKeyStartTime;
    }

    // Check for key change
    if (detectedKey != mCurrentKey) {
        // Only accept key change if:
        // 1. Confidence is above threshold
        // 2. Previous key was held for minimum duration OR new key is much stronger
        bool acceptChange = false;

        if (detectedKey.confidence >= mConfidenceThreshold) {
            if (!mKeyActive) {
                // No previous key, accept new key
                acceptChange = true;
            } else if (mCurrentKey.duration >= mMinKeyDuration) {
                // Previous key held long enough, allow change
                acceptChange = true;
            } else if (detectedKey.confidence > mCurrentKey.confidence * 1.2f) {
                // New key is significantly stronger, allow early change
                acceptChange = true;
            }
        }

        if (acceptChange) {
            mPreviousKey = mCurrentKey;
            mCurrentKey = detectedKey;
            mKeyStartTime = timestamp;
            mKeyActive = true;

            FL_DBG("Key change: " << mCurrentKey.getRootName() << " "
                   << mCurrentKey.getQuality() << " (confidence: "
                   << mCurrentKey.confidence << ")");

            mFireKeyChange = true;
        }