/**
 * handlers/mp3.ts — MP3/ID3v2 handler
 *
 * MP3 files typically begin with an ID3v2 tag.
 * We embed the signature as a TXXX (user-defined text) frame with
 * description "MAJIK-SIGNATURE" and value = signature JSON.
 *
 * If no ID3v2 header exists, we create one.
 *
 * ID3v2.3 frame layout:
 *   [4B frame_id][4B size (not syncsafe in v2.3)][2B flags][encoding(0x03=UTF-8)][description\0][value]
 *
 * ID3v2 header:
 *   "ID3" [1B major_ver=3][1B revision=0][1B flags=0][4B syncsafe_size]
 */
import { FormatHandler } from "../../types";
export declare class Mp3Handler implements FormatHandler {
    readonly name = "MP3";
    readonly supportedMimeTypes: readonly ["audio/mpeg", "audio/mp3"];
    canHandle(bytes: Uint8Array, mimeType?: string): boolean;
    embed(bytes: Uint8Array, signatureJson: string): Promise<Uint8Array>;
    extract(bytes: Uint8Array): Promise<string | null>;
    strip(bytes: Uint8Array): Promise<Uint8Array>;
    private _readSyncsafeInt;
    private _writeSyncsafeInt;
    private _parseID3v2Frames;
    private _buildTXXXFrame;
    private _readTXXXFrame;
    private _buildID3v2Header;
    private _buildID3v2HeaderFromFrames;
    private _injectFrame;
}