export default abstract class VbrHeader {
    private readonly _bitrateKilobytes;
    private readonly _durationMilliseconds;
    private readonly _totalFrames;
    private readonly _totalBytes;
    protected constructor(totalFrames?: number, totalBytes?: number, durationSeconds?: number, bitrateBytes?: number);
    /**
     * Gets the bitrate of the ile in kilobytes per second, if it could be calculated using the
     * current instance. `undefined`, otherwise.
     */
    get bitrateKilobytes(): number | undefined;
    /**
     * Gets the duration of the file in milliseconds, if it could be calculated using the current
     * instance. `undefined`, otherwise.
     */
    get durationMilliseconds(): number | undefined;
    /**
     * Gets the total number of frames in the file, as indicated by the current instance.
     */
    get totalFrames(): number | undefined;
    /**
     * Gets the total size of the file in bytes, as indicated by the current instance.
     */
    get totalBytes(): number | undefined;
}