import { Seconds } from "../global";
declare type IOICluster = {
    ioi: Seconds;
    size: number;
    score?: number;
};
/**
 * An object which collects an histogram of inter onset interval (ioi) clusters
 * based on series of time points.
 */
declare class IOIHistogram {
    widthThreshold: Seconds;
    maxIOI: Seconds;
    minIOI: Seconds;
    maxTempi: number;
    mergeOnTheFly: boolean;
    minBeatInterval: Seconds;
    maxBeatInterval: Seconds;
    i: number;
    buffer: Seconds[];
    clusters: IOICluster[];
    constructor({ widthThreshold, // 25ms
    maxIOI, // seconds
    minIOI, // seconds
    mergeOnTheFly, maxTempi, minBeatInterval, // 200bpm
    maxBeatInterval, }?: {
        widthThreshold?: number | undefined;
        maxIOI?: number | undefined;
        minIOI?: number | undefined;
        mergeOnTheFly?: boolean | undefined;
        maxTempi?: number | undefined;
        minBeatInterval?: number | undefined;
        maxBeatInterval?: number | undefined;
    });
    /** Pass peak data to the IOI histogram */
    data(t: Seconds | Seconds[]): this;
    /** Flush the buffer at the end of passing peak data to the histogram.  */
    flush(): this;
    /** Process (and remove) the first data point in the buffer. */
    private processForward;
    /** Merge all similar clusters. */
    mergeClusters(): void;
    /**
     * Recursizely merges adjacent clusters to the given index if they are within the widthThreshold.
     * Returns the new index of the index argument
     */
    mergeAdjacent(i: number): number;
    /**
     * Calculate/recaculate salience scores for each cluster.
     */
    refreshScores(): void;
    /**
     * Shortlist indexes of the largest clusters.
     */
    readonly shortlist: number[];
    /**
     * Creates a list of hypothetical tempos (expressed as beat intervals in
     * seconds).
     */
    createTempoList(): number[];
}
export default IOIHistogram;