import VbrHeader from "./vbrHeader";
import { File } from "../file";
import { IAudioCodec, MediaTypes } from "../properties";
import { ChannelMode, MpegVersion } from "./mpegEnums";
/**
 * Provides information about an MPEG audio stream. For more information and definition of the
 * header, see http://www.mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm
 */
export default class MpegAudioHeader implements IAudioCodec {
    private static readonly BITRATES;
    private static readonly BLOCK_SIZES;
    private static readonly SAMPLE_RATES;
    private readonly _bitrate;
    private readonly _channelMode;
    private readonly _layer;
    private readonly _isCopyrighted;
    private readonly _isOriginal;
    private readonly _isProtected;
    private readonly _sampleRate;
    private readonly _samplesPerFrame;
    private readonly _streamLength;
    private readonly _version;
    private readonly _versionString;
    private _vbrHeader;
    private constructor();
    /**
     * Constructs an MPEG audio header by searching the provided file for an MPEG sync signature
     * and reading the header that immediately follows.
     * @param file File from which to read the audio header
     * @param searchStart Offset into the file to begin searching
     * @param searchEnd Offset into the file to stop searching
     * @param streamBytes Total number of bytes in the audio stream. Used to calculate duration if
     *     a VBR header does not additionally specify it. If VBR header is not present and
     *     {@link streamBytes} is `undefined`, then duration will be 0.
     * @returns MpegAudioHeader Header as read from the file, `undefined` if not found.
     */
    static fromFile(file: File, searchStart: number, searchEnd: number, streamBytes?: number): MpegAudioHeader;
    /** @inheritDoc */
    get audioBitrate(): number;
    /** @inheritDoc */
    get audioChannels(): number;
    /** @inheritDoc */
    get audioSampleRate(): number;
    /**
     * Gets the MPEG audio channel mode of the audio represented by the current instance.
     */
    get channelMode(): ChannelMode;
    /** @inheritDoc */
    get description(): string;
    /** @inheritDoc */
    get durationMilliseconds(): number;
    /**
     * Whether the current audio is copyrighted.
     */
    get isCopyrighted(): boolean;
    /**
     * Whether the current audio is original.
     */
    get isOriginal(): boolean;
    /**
     * Gets whether the audio represented by the current instance is protected by CRC.
     */
    get isProtected(): boolean;
    /**
     * Gets the MPEG audio layer used to encode the audio represented by the current instance.
     */
    get layer(): number;
    /** @inheritDoc */
    get mediaTypes(): MediaTypes;
    /**
     * Gets the variable bitrate header (VBR) if the MPEG audio frame contains one.
     */
    get vbrHeader(): VbrHeader;
    /**
     * Gets the MPEG version used to encode the audio represented by the current instance.
     */
    get version(): MpegVersion;
    private static isHeaderValid;
}