import IOggCodec from "./iOggCodec";
import XiphComment from "../../xiph/xiphComment";
import { ByteVector } from "../../byteVector";
import { IAudioCodec, MediaTypes } from "../../properties";
/**
 * Represents an Ogg Opus bitstream for use within an Ogg file.
 */
export default class Opus implements IOggCodec, IAudioCodec {
    private static readonly HEADER_IDENTIFIER;
    private static readonly COMMENT_IDENTIFIER;
    private readonly _channelCount;
    private readonly _inputSampleRate;
    private readonly _opusVersion;
    private readonly _preSkip;
    private readonly _streamCount;
    private _commentData;
    private _durationMilliseconds;
    /**
     * Constructs and initializes a new instance using the provided header packet to read the
     * codec's header information.
     * @param headerPacket Packet containing the header of the stream
     */
    constructor(headerPacket: ByteVector);
    /**
     * @inheritDoc
     * @remarks
     *     Always returns zero since bitrate is variable and no information is stored in the
     *     Ogg header (unlike Vorbis).
     */
    get audioBitrate(): number;
    /**
     * @inheritDoc
     * @remarks
     *     This is the *input* sample rate used when the file was created. Opus uses a variety
     *     of sample rates internally, and as such the output sample rate is dependent on the
     *     decoder used. In most modern hardware cases, this will be 48kHz.
     */
    get audioSampleRate(): number;
    /** @inheritDoc */
    get audioChannels(): number;
    /**
     * Gets the raw Xiph comment data contained in the codec.
     */
    get commentData(): ByteVector;
    /** @inheritDoc */
    get description(): string;
    /** @inheritDoc */
    get durationMilliseconds(): number;
    /** @inheritDoc */
    get mediaTypes(): MediaTypes;
    /**
     * Gets the number of streams contained in the bitstream.
     */
    get streamCount(): number;
    /**
     * Determines whether an Opus header packet based on the presence of the Opus header
     * packet magic signature.
     * @param headerPacket Packet to check
     */
    static isHeaderPacket(headerPacket: ByteVector): boolean;
    /** @inheritDoc */
    readPacket(packet: ByteVector): boolean;
    /** @inheritDoc */
    writeCommentPacket(packets: ByteVector[], comment: XiphComment): void;
    setDuration(firstGranularPosition: ByteVector, lastGranularPosition: ByteVector): void;
}