/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the Microsoft Live Share SDK License.
 */
import EventEmitter from "events";
import { IMediaPlayerState } from "../LiveMediaSessionCoordinator";
import { CoordinationWaitPoint, ExtendedMediaMetadata, ExtendedMediaSessionActionSource } from "../MediaSessionExtensions";
import { IGroupStateEvent } from "./interfaces";
/**
 * @hidden
 */
export interface IPlaybackTrack {
    metadata: ExtendedMediaMetadata | null;
    waitPoints: CoordinationWaitPoint[];
    timestamp: number;
    clientId: string;
}
/**
 * @hidden
 */
export declare enum GroupPlaybackTrackEvents {
    trackChange = "trackChange"
}
/**
 * @hidden
 */
export interface IPlaybackTrackChangeEvent extends IGroupStateEvent {
    metadata: ExtendedMediaMetadata | null;
}
/**
 * @hidden
 */
export declare class GroupPlaybackTrack extends EventEmitter {
    private readonly _getMediaPlayerState;
    private _current;
    constructor(getMediaPlayerState: () => IMediaPlayerState);
    get current(): Readonly<IPlaybackTrack>;
    get metadata(): ExtendedMediaMetadata | null;
    addWaitPoint(waitPoint: CoordinationWaitPoint): boolean;
    findNextWaitPoint(lastWaitPoint: CoordinationWaitPoint | undefined): CoordinationWaitPoint | undefined;
    updateTrack(track: IPlaybackTrack, source: ExtendedMediaSessionActionSource): boolean;
    compare(metadata: ExtendedMediaMetadata | null): boolean;
    static compareMetadata(current: ExtendedMediaMetadata | null, metadata: ExtendedMediaMetadata | null): boolean;
}
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