/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the Microsoft Live Share SDK License.
 */
import { LiveShareRuntime } from "@microsoft/live-share";
import EventEmitter from "events";
import { IMediaPlayerState } from "../LiveMediaSessionCoordinator";
import { ExtendedMediaSessionPlaybackState, ExtendedMediaSessionAction, ExtendedMediaSessionActionSource } from "../MediaSessionExtensions";
import { GroupPlaybackTrack } from "./GroupPlaybackTrack";
import { IGroupStateEvent } from "./interfaces";
import { GroupPlaybackRate } from "./GroupPlaybackRate";
/**
 * @hidden
 */
export interface ITransportState {
    playbackState: ExtendedMediaSessionPlaybackState;
    startPosition: number;
    timestamp: number;
    clientId: string;
}
/**
 * @hidden
 */
export declare enum GroupTransportStateEvents {
    transportStateChange = "transportStateChange"
}
/**
 * @hidden
 */
export interface ITransportStateChangeEvent extends IGroupStateEvent {
    action: ExtendedMediaSessionAction;
    seekTime?: number;
}
/**
 * @hidden
 */
export declare class GroupTransportState extends EventEmitter {
    private readonly _getMediaPlayerState;
    private _track;
    private _playbackRate;
    private readonly _liveRuntime;
    private _current;
    constructor(track: GroupPlaybackTrack, playbackRate: GroupPlaybackRate, getMediaPlayerState: () => IMediaPlayerState, liveRuntime: LiveShareRuntime);
    get current(): Readonly<ITransportState>;
    get playbackState(): ExtendedMediaSessionPlaybackState;
    get startPosition(): number;
    get timestamp(): number;
    get track(): GroupPlaybackTrack;
    compare(state: ITransportState): boolean;
    updateState(state: ITransportState, source: ExtendedMediaSessionActionSource): boolean;
}
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