detectBeat()

void fl::audio::Reactive::detectBeat ( fl::u32 currentTimeMs )

private

Definition at line 367 of file audio_reactive.cpp.hpp.

                                                          {
    // Need minimum time since last beat
    if (currentTimeMs - mLastBeatTime < BEAT_COOLDOWN) {
        mCurrentData.beatDetected = false;
        return;
    }
    
    // Use raw volume for beat detection — it is proportional to amplitude.
    // Adaptive volume (mCurrentData.volume) converges toward a steady state,
    // masking the transient jumps that indicate beats.
    // NOTE: this runs BEFORE applyGain(), so beat detection is gain-independent.
    float currentVolume = mCurrentData.volumeRaw;
    
    // Beat detected if volume significantly increased
    if (currentVolume > mPreviousVolume + mVolumeThreshold && 
        currentVolume > 0.02f) {  // Minimum volume threshold
        mCurrentData.beatDetected = true;
        mLastBeatTime = currentTimeMs;
    } else {
        mCurrentData.beatDetected = false;
    }
    
    // Update previous volume for next comparison using attack/decay
    float beatAttackRate = mConfig.attack / 255.0f * 0.5f + 0.1f;   // 0.1 to 0.6
    float beatDecayRate = mConfig.decay / 255.0f * 0.3f + 0.05f;    // 0.05 to 0.35
    
    if (currentVolume > mPreviousVolume) {
        // Rising volume - use attack rate (faster tracking)
        mPreviousVolume = mPreviousVolume * (1.0f - beatAttackRate) + currentVolume * beatAttackRate;
    } else {
        // Falling volume - use decay rate (slower tracking)
        mPreviousVolume = mPreviousVolume * (1.0f - beatDecayRate) + currentVolume * beatDecayRate;
    }
}

References BEAT_COOLDOWN, fl::FL_NO_EXCEPT, mConfig, mCurrentData, mLastBeatTime, mPreviousVolume, and mVolumeThreshold.