/**
 * Main-thread client for the TranscodeWorker.
 *
 * Provides the same interface as SegmentTranscoder but delegates all
 * heavy work to a Web Worker via postMessage.
 */
import type { SegmentTranscoderConfig, TranscodedInit } from "./segment-transcoder.js";
type PerfEnvelope = {
    demuxMs: number;
    decodeMs: number;
    encodeMs: number;
    frames: number;
    segDurMs: number;
    width: number;
    height: number;
};
export interface TranscodeWorkerClientConfig extends SegmentTranscoderConfig {
    /** URL to the worker script (transcode-worker.js). */
    workerUrl: string;
}
export declare class TranscodeWorkerClient {
    private _workerReady;
    private _ready;
    private _initParsed;
    private _initResult;
    private _segmentId;
    private _pendingResolves;
    private _pendingPrepareInit;
    private _readyPromise;
    private _readyResolve;
    private _initParsedPromise;
    private _initParsedResolve;
    private _initParsedReject;
    private _lastPerfStats;
    constructor(config: TranscodeWorkerClientConfig);
    get isInitialized(): boolean;
    get isInitParsed(): boolean;
    get initResult(): TranscodedInit | null;
    get lastPerfStats(): PerfEnvelope | null;
    /** Wait for the WASM decoder to be ready inside the worker */
    waitReady(): Promise<void>;
    /** Send an init segment (ftyp + moov) to the worker for parsing */
    processInitSegment(data: Uint8Array): Promise<void>;
    /**
     * Process an HEVC init segment and return a matching H.264 fMP4 init
     * segment (warmup-encoder path inside the worker). Required by
     * transmuxer plugins that must hand an init segment back to the host
     * player before any media has been seen (Shaka 4.x's Transmuxer
     * contract).
     */
    prepareInit(data: Uint8Array): Promise<TranscodedInit>;
    /** Send a media segment to the worker for transcoding */
    processMediaSegment(data: Uint8Array): Promise<Uint8Array | null>;
    /** Send a media segment for streaming transcoding — onChunk called for each partial result */
    processMediaSegmentStreaming(data: Uint8Array, onChunk: (h264: Uint8Array, initSegment: Uint8Array | null, codec: string | null) => Promise<void> | void): Promise<void>;
    /** Abort current transcoding, reset state for seek */
    abort(): void;
    /** Destroy the worker */
    destroy(): void;
    private _onMessage;
}
export {};
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