/** Options for {@link decodeHca}. */
export interface DecodeOptions {
    /**
     * 64-bit HCA cipher key as a `bigint`. Unused for type-0
     * (unencrypted) and type-1 (static-table) cipher headers.
     */
    key?: bigint;
    /**
     * AWB sub-key. Combined with `key` for the final 64-bit
     * cipher seed when the HCA was extracted from an AWB.
     * Unused for standalone HCAs.
     */
    awbKey?: number;
    /** Volume multiplier; defaults to 1.0. */
    volume?: number;
}
export interface DecodedHca {
    channelCount: number;
    samplingRate: number;
    /** Total number of samples per channel (NOT total floats). */
    samplesPerChannel: number;
    /**
     * Interleaved Float32 PCM: `[ch0_s0, ch1_s0, ch0_s1, ...]`.
     * Length is `samplesPerChannel * channelCount`.
     */
    pcm: Float32Array;
    loopStart?: number;
    loopEnd?: number;
}
/**
 * Decode an HCA file end-to-end into a flat Float32 PCM buffer.
 */
export declare function decodeHca(bytes: Uint8Array, options?: DecodeOptions): DecodedHca;
/** Thrown when a block's CRC fails. */
export declare class HcaDecodeError extends Error {
    constructor(message: string);
}