/** @packageDocumentation Audio properties for the Ogg Speex format, parsed from the Speex identification header (packet 0). */
import { AudioProperties } from "../../audioProperties.js";
import { ReadStyle } from "../../toolkit/types.js";
import type { OggFile } from "../oggFile.js";
/**
 * Audio properties for Ogg Speex files, parsed from the Speex identification
 * header (packet 0).
 *
 * Speex header layout:
 *   "Speex   "(8) + speexVersion(20) + speexVersionId(4 LE) +
 *   headerSize(4 LE) + rate(4 LE) + mode(4 LE) +
 *   modeBitstreamVersion(4 LE) + nbChannels(4 LE) + bitrate(4 LE) +
 *   frameSize(4 LE) + vbr(4 LE) + framesPerPacket(4 LE)
 */
export declare class SpeexProperties extends AudioProperties {
    /** Stream duration in milliseconds, computed from first and last granule positions. */
    private _lengthInMs;
    /** Average bitrate in kilobits per second, computed from stream data. */
    private _bitrate;
    /** Sample rate in Hz as declared in the Speex identification header. */
    private _sampleRate;
    /** Number of audio channels as declared in the Speex identification header. */
    private _channels;
    /** Nominal bitrate from the Speex header in bits per second; `-1` for VBR, `0` if unset. */
    private _bitrateNominal;
    /**
     * Constructs a SpeexProperties instance with the given read style.
     * @param readStyle - Level of detail for property parsing.
     */
    constructor(readStyle?: ReadStyle);
    /**
     * Asynchronously parse and return audio properties from the given Ogg Speex file.
     * @param file - The {@link OggFile} to read properties from.
     * @param readStyle - Level of detail for property parsing.
     * @returns A populated {@link SpeexProperties} instance.
     */
    static create(file: OggFile, readStyle?: ReadStyle): Promise<SpeexProperties>;
    /** Stream duration in milliseconds, computed from first and last granule positions. */
    get lengthInMilliseconds(): number;
    /** Average bitrate in kilobits per second, computed from audio data size and duration. */
    get bitrate(): number;
    /** Sample rate in Hz as declared in the Speex identification header. */
    get sampleRate(): number;
    /** Number of audio channels as declared in the Speex identification header. */
    get channels(): number;
    /**
     * Nominal bitrate from the Speex header in bits per second.
     * `-1` indicates variable-bitrate (VBR); `0` indicates not set.
     */
    get bitrateNominal(): number;
    /**
     * Reads and populates audio properties from the Speex identification header (packet 0).
     * @param file - The {@link OggFile} to read from.
     */
    private read;
}
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