/**
 * AudioAnalyzer.ts
 *
 * Real-time audio analysis: FFT spectrum, beat detection,
 * loudness metering, and audio-reactive parameter extraction.
 *
 * @module audio
 */
export interface SpectrumData {
    frequencies: Float32Array;
    binCount: number;
    sampleRate: number;
    peakFrequency: number;
    peakMagnitude: number;
}
export interface BeatDetectionConfig {
    sensitivity: number;
    minInterval: number;
    energyThreshold: number;
    frequencyRange: {
        low: number;
        high: number;
    };
}
export interface BeatEvent {
    timestamp: number;
    energy: number;
    bpm: number;
    strength: number;
}
export interface LoudnessMetrics {
    rms: number;
    peak: number;
    lufs: number;
    dynamicRange: number;
}
export interface AudioBand {
    name: string;
    low: number;
    high: number;
    energy: number;
}
export declare const DEFAULT_BANDS: AudioBand[];
export declare class AudioAnalyzer {
    private fftSize;
    private sampleRate;
    private currentSpectrum;
    private bands;
    private beatConfig;
    private beatHistory;
    private energyHistory;
    private lastBeatTime;
    private smoothedEnergy;
    private loudness;
    constructor(fftSize?: number, sampleRate?: number, beatConfig?: Partial<BeatDetectionConfig>);
    /**
     * Analyze a buffer of audio samples.
     */
    analyze(samples: Float32Array, currentTimeMs: number): void;
    private computeBands;
    private computeLoudness;
    private detectBeat;
    private estimateBPM;
    getSpectrum(): SpectrumData | null;
    getBands(): AudioBand[];
    getBandEnergy(bandName: string): number;
    getLoudness(): LoudnessMetrics;
    getBeats(): BeatEvent[];
    getLastBeat(): BeatEvent | null;
    getEstimatedBPM(): number;
    getSmoothedEnergy(): number;
    /**
     * Get a normalized 0-1 value for audio-reactive use.
     * Combines bass energy with beat strength.
     */
    getReactiveValue(): number;
    reset(): void;
}
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