/// <reference types="node" />
import type { trackType } from '../types';
export declare const getSongFileName: ({ MD5_ORIGIN, SNG_ID, MEDIA_VERSION }: trackType, quality: number) => string;
/**
 *
 * @param source Downloaded song from `getTrackDownloadUrl`
 * @param trackId Song ID as string
 */
export declare const decryptDownload: (source: Buffer, trackId: string) => Buffer;