/** @format */
import { MemoryImage } from '../image/image.js';
import { Decoder, DecoderDecodeOptions } from './decoder.js';
import { ImageFormat } from './image-format.js';
import { JpegInfo } from './jpeg/jpeg-info.js';
/**
 * Decode a jpeg encoded image.
 */
export declare class JpegDecoder implements Decoder {
    /**
     * Input buffer for the JPEG data.
     */
    private _input?;
    /**
     * Information about the JPEG image.
     */
    private _info?;
    /**
     * Get the image format.
     * @returns {ImageFormat} The format of the image, which is JPEG.
     */
    get format(): ImageFormat;
    /**
     * Get the number of frames in the JPEG image.
     * @returns {number} The number of frames.
     */
    get numFrames(): number;
    /**
     * Is the given file a valid JPEG image?
     * @param {Uint8Array} bytes - The bytes of the file to validate.
     * @returns {boolean} True if the file is a valid JPEG image, false otherwise.
     */
    isValidFile(bytes: Uint8Array): boolean;
    /**
     * Start decoding the JPEG image.
     * @param {Uint8Array} bytes - The bytes of the JPEG image.
     * @returns {JpegInfo | undefined} Information about the JPEG image, or undefined if decoding fails.
     */
    startDecode(bytes: Uint8Array): JpegInfo | undefined;
    /**
     * Decode a specific frame of the JPEG image.
     * @param {number} _ - The frame index (currently only single frame JPEGs are supported).
     * @returns {MemoryImage | undefined} The decoded image, or undefined if decoding fails.
     * @throws {LibError} If the JPEG contains more than one frame.
     */
    decodeFrame(_: number): MemoryImage | undefined;
    /**
     * Decode the JPEG image.
     * @param {DecoderDecodeOptions} opt - The options for decoding.
     * @param {Uint8Array} opt.bytes - The bytes of the JPEG image.
     * @returns {MemoryImage | undefined} The decoded image, or undefined if decoding fails.
     * @throws {LibError} If the JPEG contains more than one frame.
     */
    decode(opt: DecoderDecodeOptions): MemoryImage | undefined;
}