import { Audio } from './audio';
/**
 * Create a AudioAnalyser object, which uses an AnalyserNode to analyse audio data.
 * This uses the Web Audio API.
 */
export declare class AudioAnalyser {
    /** An AnalyserNode used to analyze audio. */
    analyser: AnalyserNode;
    /** A Uint8Array with size determined by analyser.frequencyBinCount used to hold analysis data. */
    data: Uint8Array;
    /**
     * An [AnalyserNode](https://developer.mozilla.org/en-US/docs/Web/API/AnalyserNode) used to analyze audio.
     * @param audio
     * @param fftSize A non-zero power of two up to 2048, representing the size of the FFT (Fast Fourier Transform) to be used to determine the frequency domain. See this page for details.
     */
    constructor(audio: Audio, fftSize?: number);
    /** Uses the Web Audio's getByteFrequencyData method. See that page. */
    getFrequencyData(): Uint8Array;
    /** Get the average of the frequencies returned by the getFrequencyData method. */
    getAverageFrequency(): number;
}
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