export interface AudioOutputState {
    deviceId: string;
}
type AudioOutputChangeCallback = (state: AudioOutputState) => void;
export declare class AudioOutputController {
    private state;
    private callbacks;
    private availableDevices;
    private registeredElements;
    registerAudioElement: (element: HTMLAudioElement | HTMLVideoElement) => VoidFunction;
    setAvailableDevices(devices: MediaDeviceInfo[]): void;
    setOutputDevice: (deviceId: string) => Promise<void>;
    private applyToRegisteredElements;
    private findSpeakerphone;
    autoSelectSpeakerphone(): Promise<boolean>;
    getOutputState(): AudioOutputState;
    isOutputSelectionSupported(): boolean;
    onChange: (callback: AudioOutputChangeCallback) => VoidFunction;
    private _notifyState;
    playTestSound(options?: {
        url?: string;
        duration?: number;
    }): Promise<void>;
    private playTestSoundFromUrl;
    private playGeneratedTone;
    destroy(): void;
}
export {};