import AudioVideoController from '../audiovideocontroller/AudioVideoController';
/**
 * Media controllers acquire media streams from the [[MediaStreamBroker]], which
 * fulfills the requests either through direct getUserMedia requests or a
 * higher-level intermediary such as a [[DeviceController]]. When a media
 * controller no longer needs a media stream it calls [[releaseMediaStream]].
 */
export default interface MediaStreamBroker {
    /**
     * Called when the session needs to attach an audio input to the peer
     * connection.
     */
    acquireAudioInputStream(): Promise<MediaStream>;
    /**
     * Called when the session needs to attach a video input to the peer
     * connection.
     */
    acquireVideoInputStream(): Promise<MediaStream>;
    /**
     * Called when the session needs to acquire a display input device for screen sharing.
     */
    acquireDisplayInputStream(streamConstraints: MediaStreamConstraints): Promise<MediaStream>;
    /**
     * Called when a media stream is no longer being used and can be cleaned up
     * or cached for later used.
     */
    releaseMediaStream(mediaStreamToRelease: MediaStream): void;
    /**
     * Binds the media stream broker to the audio video controller. This is called
     * automatically by the meeting session constructor.
     */
    bindToAudioVideoController(audioVideoController: AudioVideoController): void;
}