export declare const VIDEO_CONSTRAINS: {
    qvga: {
        width: number;
        height: number;
    };
    vga: {
        width: number;
        height: number;
    };
    hd: {
        width: number;
        height: number;
    };
    fullhd: {
        width: number;
        height: number;
    };
};
export declare const SpatialLayer: {
    LOW: number;
    MEDIUM: number;
    HIGH: number;
};
export declare const TemporalLayer: {
    BASE: number;
    MIDDLE: number;
    HIGH: number;
};