import { MediaChannel } from './media-channel';
import { Call } from './call';
export interface Device {
    deviceId: string;
    groupId: string;
    label: string;
}
/**
 * IO Service allow your to quickly manager your inputs and outputs
 */
export declare class IOService {
    input?: Device;
    output?: Device;
    volume: number;
    private inputs;
    private outputs;
    private calls;
    onDevicesUpdatedListeners: Function[];
    constructor(calls: Call[]);
    onDevicesUpdated(fn: Function): void;
    meetsRequirement(): boolean;
    useDefaultInput(): void;
    useDefaultOutput(): void;
    getChannel(): Promise<MediaChannel | undefined>;
    useInput(device: Device, withRetryIfFailed?: boolean): Promise<void>;
    useOutput(device: Device): Promise<void>;
    /**
     * return all the available input medias
     */
    getInputs(): Device[];
    /**
     * return all the available output medias
     */
    getOutputs(): Device[];
    setVolume(vol: number): void;
    load(): Promise<void>;
    private emitDevicesUpdatedListeners;
    private listenForDevicesUpdate;
    private onInputListUpdated;
    private onOutputlistUpdated;
    private getDevices;
}