/** @packageDocumentation Xing and VBRI VBR header parser for MPEG audio files, used to determine total frame count and stream size. */
import { ByteVector } from "../byteVector.js";
/**
 * Identifies the type of VBR header found in the first MPEG frame.
 */
export declare enum XingHeaderType {
    /** No valid VBR header was found. */
    Invalid = 0,
    /** A Xing or Info VBR header was found. */
    Xing = 1,
    /** A VBRI VBR header (Fraunhofer) was found. */
    VBRI = 2
}
/**
 * Parser for Xing and VBRI VBR headers found inside the first MPEG frame.
 */
export declare class XingHeader {
    /** The type of VBR header detected. */
    private _type;
    /** Total number of MPEG frames in the stream, as reported by the VBR header. */
    private _totalFrames;
    /** Total byte size of the audio stream, as reported by the VBR header. */
    private _totalSize;
    /**
     * Constructs an `XingHeader` by attempting to parse a Xing/Info or VBRI
     * header from the first frame's data.
     *
     * @param data - The raw bytes of the first MPEG audio frame (header + side information + payload).
     */
    constructor(data: ByteVector);
    /**
     * Gets whether this is a valid, usable VBR header (type is not `Invalid`
     * and both `totalFrames` and `totalSize` are non-zero).
     */
    get isValid(): boolean;
    /** Gets the total number of MPEG frames in the stream. */
    get totalFrames(): number;
    /** Gets the total byte size of the audio data. */
    get totalSize(): number;
    /** Gets the type of VBR header detected (`Xing`, `VBRI`, or `Invalid`). */
    get type(): XingHeaderType;
    /**
     * Attempts to locate and parse a Xing/Info or VBRI header in `data`.
     * @param data - The first MPEG frame's raw bytes.
     */
    private parse;
    /**
     * Parses a Xing or Info VBR header starting at `offset` within `data`.
     * Both the frame-count flag (0x01) and the size flag (0x02) must be set.
     *
     * @param data - The first MPEG frame's raw bytes.
     * @param offset - Byte offset of the "Xing"/"Info" magic within `data`.
     */
    private parseXing;
    /**
     * Parses a VBRI (Fraunhofer) VBR header starting at `offset` within `data`.
     * The total size is read at offset+10 and total frames at offset+14.
     *
     * @param data - The first MPEG frame's raw bytes.
     * @param offset - Byte offset of the "VBRI" magic within `data`.
     */
    private parseVBRI;
}
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