/**
 * Detail object emitted with the 'play' event.
 * Contains playback time, formatted time, and percentage played.
 */
export interface PlayEventDetail {
    /** Seconds played so far. */
    timePlayed: number;
    /** Formatted time string (mm:ss). */
    formattedTimePlayed: string;
    /** Percentage of buffer played (0-100). */
    percentagePlayed: number;
}
/**
 * Listener for custom playback events.
 */
interface EventListener {
    /** Event name (e.g. 'play'). */
    name: string;
    /** Callback for event detail. */
    cb: (detail: PlayEventDetail) => void;
}
/**
 * High-level wrapper for real-time pitch shifting using ScriptProcessorNode.
 * Handles buffering, playback tracking, and parameter control.
 *
 * @remarks
 * Provides pitch, rate, and tempo control for an AudioBuffer source.
 * Emits 'play' events for playback progress.
 */
export default class PitchShifter {
    /** Internal SoundTouch processor. */
    private _soundtouch;
    /** Internal filter for sample processing. */
    private _filter;
    /** Internal ScriptProcessorNode for audio output. */
    _node: ScriptProcessorNode;
    /** Seconds played so far. */
    timePlayed: number;
    /** Current sample position in buffer. */
    sourcePosition: number;
    /** Duration of the source buffer (seconds). */
    duration: number;
    /** Sample rate of the audio context. */
    sampleRate: number;
    /** Registered event listeners. */
    listeners: EventListener[];
    /**
     * Creates a PitchShifter instance for an AudioBuffer.
     * @param context AudioContext or OfflineAudioContext
     * @param buffer Source AudioBuffer
     * @param bufferSize Size of ScriptProcessorNode buffer
     * @param onEnd Callback when playback ends
     */
    constructor(context: BaseAudioContext, buffer: AudioBuffer, bufferSize: number, onEnd?: () => void);
    /**
     * Returns formatted duration string (mm:ss).
     */
    get formattedDuration(): string;
    /**
     * Returns formatted time played string (mm:ss).
     */
    get formattedTimePlayed(): string;
    /**
     * Returns percentage of buffer played (0-100).
     */
    get percentagePlayed(): number;
    /**
     * Sets playback position by percentage.
     * @param perc Percentage (0-100).
     */
    set percentagePlayed(perc: number);
    /**
     * Returns the ScriptProcessorNode for audio output.
     */
    get node(): ScriptProcessorNode;
    /**
     * Sets pitch factor.
     * @param pitch Pitch factor.
     */
    set pitch(pitch: number);
    /**
     * Sets pitch in semitones.
     * @param semitone Pitch semitones.
     */
    set pitchSemitones(semitone: number);
    /**
     * Sets playback rate.
     * @param rate Rate factor.
     */
    set rate(rate: number);
    /**
     * Sets playback tempo.
     * @param tempo Tempo factor.
     */
    set tempo(tempo: number);
    /**
     * Connects the ScriptProcessorNode to another AudioNode.
     * @param toNode Destination AudioNode.
     */
    connect(toNode: AudioNode): void;
    /**
     * Disconnects the ScriptProcessorNode from its destination.
     */
    disconnect(): void;
    /**
     * Registers an event listener for custom playback events.
     * @param eventName Event name (e.g. 'play').
     * @param cb Callback for event detail.
     */
    on(eventName: string, cb: (detail: PlayEventDetail) => void): void;
    /**
     * Removes event listeners for custom playback events.
     * @param eventName Event name to remove (or all if null).
     */
    off(eventName?: string | null): void;
}
export {};
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