/** @packageDocumentation Audio properties for MP4/M4A/AAC/ALAC files. */
import { AudioProperties } from "../audioProperties.js";
import type { IOStream } from "../toolkit/ioStream.js";
import { ReadStyle } from "../toolkit/types.js";
import type { Mp4Atoms } from "./mp4Atoms.js";
export declare enum Mp4Codec {
    Unknown = 0,
    AAC = 1,
    ALAC = 2
}
export declare class Mp4Properties extends AudioProperties {
    private _lengthMs;
    private _bitrate;
    private _sampleRate;
    private _channels;
    private _bitsPerSample;
    private _encrypted;
    private _codec;
    private constructor();
    static create(stream: IOStream, atoms: Mp4Atoms, readStyle?: ReadStyle): Promise<Mp4Properties>;
    get lengthInMilliseconds(): number;
    get bitrate(): number;
    get sampleRate(): number;
    get channels(): number;
    get bitsPerSample(): number;
    get isEncrypted(): boolean;
    get codec(): Mp4Codec;
    private read;
}
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