/**
 * [[MediaStreamBrokerObserver]] can be registered with a [[MediaStreamBroker]] to receive callbacks on media stream
 * change events.
 */
export default interface MediaStreamBrokerObserver {
    /**
     * Called when the video input stream is changed.
     * @param videoStream The new video input media stream
     */
    videoInputDidChange?(videoStream: MediaStream | undefined): void;
    /**
     * Called when the audio input stream is changed.
     * @param audioStream The new audio input media stream
     */
    audioInputDidChange?(audioStream: MediaStream | undefined): void;
    /**
     * Called when the audio output is changed
     * @param device The new audio output device
     */
    audioOutputDidChange?(device: MediaDeviceInfo | null): void;
}