/**
 * MSE Controller — Manages MediaSource and SourceBuffer for H.264 fMP4 playback.
 */
export declare class MSEController {
    private _video;
    private _mediaSource;
    private _sourceBuffer;
    private _queue;
    private _updating;
    private _initDone;
    constructor(video: HTMLVideoElement);
    /**
     * Initialize: create MediaSource, attach to video, create SourceBuffer.
     * @param initSegment The fMP4 init segment (ftyp + moov)
     * @param codec MIME codec string (default: avc1.42001f)
     */
    init(initSegment: Uint8Array, codec?: string): Promise<void>;
    /**
     * Append a media segment. Queues if a previous append is still in progress.
     */
    appendSegment(segment: Uint8Array): Promise<void>;
    /**
     * Remove buffered data older than keepSeconds before current time.
     */
    trimBuffer(keepSeconds?: number): Promise<void>;
    /** Signal end of stream */
    endOfStream(): void;
    /** Get buffered time ranges */
    get buffered(): TimeRanges | null;
    /** Get media duration */
    get duration(): number;
    /** Clean up resources */
    destroy(): void;
    private _append;
    private _onUpdateEnd;
}
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