Function prewarmFFTCache

tests/profile/audio_detector_performance.cpp:26–48

Pre-warm function: Prime the FFT cache before profiling This simulates real-world usage where FFT is computed first, then all detector reuse the cached result.

// This simulates real-world usage where FFT is computed first,
// then all detector reuse the cached result.
void prewarmFFTCache(int sampleRate = 16000) {
    // Create a temporary processor with all FFT-dependent detector
    // to populate the FFT cache for this sample rate/config
    fl::audio::Processor warmup;
    warmup.setSampleRate(sampleRate);

    // Register all callbacks to activate detector
    warmup.onEnergy([](float) {});
    warmup.onFrequencyBands([](float, float, float) {});  // ← Triggers FFT caching
    warmup.onBeat([]() {});
    warmup.onTempo([](float) {});
    warmup.onPitch([](float) {});
    warmup.onVocal([](fl::u8) {});
    warmup.onTransient([]() {});
    warmup.onVibeLevels([](const fl::audio::detector::VibeLevels&) {});

    // Generate and process a few samples to warm the cache
    SynthAudioGenerator gen(sampleRate);
    for (int i = 0; i < 20; i++) {
        warmup.update(gen.generateSample());
    }
    // warmup goes out of scope, cache persists in Processor instances
}

// Synthetic audio sample generator for consistent testing
class SynthAudioGenerator {