/**
 * Segment-level perf bus.
 *
 * The transcoder publishes one `SegmentPerfStat` per fully transcoded media
 * segment so that plugin-level features (e.g. compute-aware ABR in the Shaka
 * and dash.js plugins) can react to transcode throughput without reaching
 * into the transcoder internals or the worker postMessage protocol.
 *
 * Producers: `SegmentTranscoder.processMediaSegment` (main-thread path) and
 * `TranscodeWorkerClient` on receipt of the worker's `transcoded` message.
 * The worker itself does not publish — listeners always live on the main
 * thread so the bus stays a single-thread broadcast.
 */
export interface SegmentPerfStat {
    /** Wall-clock time spent in demux + decode + encode (ms). */
    totalMs: number;
    /** Intrinsic duration of the source segment in media time (ms). */
    segDurMs: number;
    /** segDurMs / totalMs — > 1 means transcode runs faster than real-time. */
    speedX: number;
    /** Number of frames produced (display-order). */
    frames: number;
    /** Decoded frame width in pixels. */
    width: number;
    /** Decoded frame height in pixels. */
    height: number;
}
type Listener = (stat: SegmentPerfStat) => void;
export declare function publishSegmentStat(stat: SegmentPerfStat): void;
export declare function subscribeSegmentStat(l: Listener): () => void;
/** Test-only — drop all subscribers. */
export declare function _resetSegmentStatBus(): void;
export {};
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