/**
 * H264Encoder — Wraps WebCodecs VideoEncoder to transcode YUV frames to H.264.
 *
 * Pipeline: HEVCFrame (Uint16Array YUV planes) → VideoFrame(I420) → VideoEncoder → EncodedVideoChunk
 */
import type { HEVCFrame } from "./types.js";
export interface H264EncoderConfig {
    width: number;
    height: number;
    fps?: number;
    bitrate?: number;
}
export interface EncodedChunk {
    data: Uint8Array;
    timestamp: number;
    duration: number;
    isKeyframe: boolean;
}
export declare class H264Encoder {
    private _encoder;
    private _width;
    private _height;
    private _fps;
    private _codecDescription;
    /** Callback invoked for each encoded chunk */
    onChunk: ((chunk: EncodedChunk) => void) | null;
    /** Callback invoked when codec description (avcC) is available */
    onCodecDescription: ((desc: Uint8Array) => void) | null;
    constructor(config: H264EncoderConfig);
    /** Get the H.264 codec string used by this encoder */
    get codec(): string;
    /** Get the avcC codec description (available after first keyframe) */
    get codecDescription(): Uint8Array | null;
    /**
     * Encode a decoded HEVC frame.
     * Converts Uint16Array YUV planes to I420 Uint8Array, creates VideoFrame, encodes.
     */
    encode(frame: HEVCFrame, timestampUs: number, keyFrame?: boolean): void;
    /** Flush the encoder — waits for all pending chunks to be output */
    flush(): Promise<void>;
    /** Close the encoder and release resources */
    close(): void;
    /** Check if VideoEncoder is supported in the current environment */
    static isSupported(): boolean;
    /**
     * Async capability probe — checks that VideoEncoder can actually encode H.264.
     * Firefox exposes VideoEncoder but may not support H.264 encoding.
     * Returns false if the API is missing or the config is not supported.
     */
    static checkSupport(): Promise<boolean>;
    private _handleOutput;
}
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