export type MediaStreamFilter = (input: MediaStream) => MediaStreamFilterResult;
export type MediaStreamFilterCleanup = () => void;
export interface MediaStreamFilterResult {
    /**
     * Transformed media stream. If the filter is asynchronous, a promise which
     * resolves with a transformed media stream.
     */
    output: MediaStream | Promise<MediaStream>;
    /**
     * An optional cleanup callback. It is called when the filter is stopped, and
     * when it is unregistered.
     */
    stop?: MediaStreamFilterCleanup;
}
export interface MediaStreamFilterEntry {
    start: MediaStreamFilter;
    /**
     * When the filter is running, it holds a cleanup callback returned when the filter
     * was started.
     */
    stop: MediaStreamFilterCleanup | undefined;
}
export interface MediaStreamFilterRegistrationResult {
    /**
     * Promise that resolves when the filter is applied to the stream.
     */
    registered: Promise<void>;
    /**
     * Function that can be called to unregister the filter.
     */
    unregister: () => Promise<void>;
}