import { File } from "../file";
import { IAudioCodec, MediaTypes } from "../properties";
/**
 * This structure implements {@link IAudioCodec} and provides information about an ADTS AAC audio
 * stream. NOTE: This header type should not be used for MPEG-4 encapsulated audio files.
 */
export default class AacAudioHeader implements IAudioCodec {
    private static readonly SAMPLE_RATES;
    /**
     * An empty an unset header
     */
    static readonly UNKNOWN: AacAudioHeader;
    private readonly _audioBitrate;
    private readonly _audioChannels;
    private readonly _audioSampleRate;
    private readonly _mpeg4AudioTypeIndex;
    private _durationMilliseconds;
    private _streamLength;
    /**
     * Constructs and initializes a new instance of {@link AacAudioHeader} by populating it with the
     * specified values.
     * @param channels Number of channels in the audio stream
     * @param bitrate Bitrate of the audio stream
     * @param sampleRate Sample rate of the audio stream
     * @param mpegAudioType ID of the MPEG-4 audio type
     */
    constructor(channels: number, bitrate: number, sampleRate: number, mpegAudioType: number);
    /** @inheritDoc */
    get audioBitrate(): number;
    /** @inheritDoc */
    get audioChannels(): number;
    /** @inheritDoc */
    get audioSampleRate(): number;
    /** @inheritDoc */
    get description(): string;
    /**
     * @inheritDoc
     * @remarks
     *     Until the stream length has been set ({@link streamLength}), this will return
     *     `undefined`.
     */
    get durationMilliseconds(): number;
    /** @inheritDoc */
    get mediaTypes(): MediaTypes;
    /**
     * Sets the length of the audio stream represented by the current instance.
     * @desc Until this value has been set, {@link durationMilliseconds} will return an incorrect
     *     value.
     * @param value Length in bytes of the audio stream represented by the current instance
     */
    set streamLength(value: number);
    /**
     * Searches for an audio header in a {@link File} starting at a specified position and
     * searching through a specified number of bytes.
     * @param file File to search
     * @param position Seek position in `file` in which to start searching
     * @param length maximum number of bytes to search before aborting. Omit to search entire file.
     *     Searching the entire file may take a very long time, it is recommended to always use a
     *     reasonable length here
     * @returns Header found or `undefined` if a header could not be found
     */
    static find(file: File, position: number, length?: number): AacAudioHeader;
}