/// <reference types="node" />
import { Transform, TransformCallback } from 'stream';
import { Smp } from '../global';
/**
 * Transform stream for preparing overlapping/spaced chunks of audio for FFT.
 */
declare class Hopper extends Transform {
    iWindow: number;
    windowSize: Smp;
    windowBuffer: Float32Array;
    hopSize: Smp;
    iHop: number;
    hopCount: number;
    constructor(windowSize: Smp, hopSize?: Smp);
    _transform(audio: AudioBuffer, encoding: string, callback: TransformCallback): void;
    static streamifyBuffer(buffer: AudioBuffer, chunkSize?: number): Hopper;
}
export { Hopper };