/**
 * Shared ISO-BMFF (`ftyp`) image-brand detection.
 *
 * FileDetector and ImageProcessor must use the same brand tables and declared
 * box boundary when classifying AVIF, HEIC, and structural HEIF brands. Keeping
 * the scan here prevents the two consumers from drifting as new brands are
 * added.
 */
export declare const AVIF_FTYP_BRANDS: Set<string>;
export declare const HEIC_FTYP_BRANDS: Set<string>;
export declare const HEIF_STRUCTURAL_FTYP_BRANDS: Set<string>;
/**
 * Whether the buffer starts with an ISO-BMFF `ftyp` box signature.
 */
export declare function hasFtypBoxSignature(input: Buffer): boolean;
/**
 * Read compatible brands without scanning past the declared `ftyp` box.
 */
export declare function getCompatibleFtypBrands(input: Buffer): Set<string>;
/**
 * Return the image MIME type encoded by an ISO-BMFF `ftyp` box, or null when
 * the box belongs to a non-image ISO-BMFF flavor.
 */
export declare function detectIsoBmffImageMimeType(input: Buffer): string | null;