import EventEmitter from "wolfy87-eventemitter";
import { Stream } from "./models/stream";
import { RecordConfig } from "./types";
import { Track } from "./models/stream/track";
export declare class DeviceManager extends EventEmitter {
    /**
     * 当前浏览器识别到的所有媒体设备信息，包括 USB 设备
     * 查看 MediaDeviceInfo 了解详细的设备信息构成
     */
    deviceInfo?: MediaDeviceInfo[];
    private deviceMap;
    constructor();
    getLocalTracks(config?: RecordConfig): Promise<Track[]>;
    getLocalStream(config?: RecordConfig): Promise<Stream>;
    private getUserMedia;
    /**
     * getDisplayMedia 不支持同时录制屏幕和麦克风
     * 在这种情况下分 2 次请求 stream 之后合并
     */
    private getDisplayMedia;
    private updateDeivceInfo;
}
export declare const deviceManager: DeviceManager;