interface Description {
    type: RTCSdpType;
    sdp: string;
}

interface Options {
    numOfLayers?: number;
}

/**
 * This class handles SDP munging for enabling simulcast for local video streams in Unified plan. A set of random SSRCs
 * are generated for the higher layer streams and they are cached for a given mid. The cached SSRCs are then reused on
 * the subsequent iterations while munging the local description. This class also handles imploding of the simulcast
 * SSRCs for remote endpoints into the primary FID group in remote description since Jicofo signals all SSRCs relevant
 * to a given endpoint.
 */
export default class SdpSimulcast {
    /**
     * Creates a new instance.
     *
     * @param options
     */
    constructor(options: Options);
    /**
     * Munges the given media description to enable simulcast for the video media sections that are in either have
     * SENDRECV or SENDONLY as the media direction thereby ignoring all the RECVONLY transceivers created for remote
     * endpoints.
     * NOTE: This needs to be called only when simulcast is enabled.
     *
     * @param description
     * @returns
     */
    mungeLocalDescription(description: Description): Description;
    /**
     * Munges the given media description by removing the SSRCs and related FID groups for the higher layer streams.
     *
     * @param description
     * @returns
     */
    mungeRemoteDescription(description: Description): Description;
}