import { VAD } from '../../agents/providers.js';
/**
 * Options for {@link SileroVAD}.
 *
 * Unknown keys are ignored for forward compatibility; a few extra keys are
 * accepted but inert.
 */
export type SileroVADOptions = {
    /** Speech-probability threshold to start speech, in [0, 1]. Default `0.4`. */
    threshold?: number;
    /** Overrides {@link threshold} when set. Default `null`. */
    startThreshold?: number | null;
    /** Overrides {@link stopThreshold} when set. Default `null`. */
    endThreshold?: number | null;
    /** Probability below which speech ends, in [0, 1]. Default `0.25`. */
    stopThreshold?: number;
    /** Minimum speech duration in seconds. Default `0.3`. */
    minSpeechDuration?: number;
    /** Minimum trailing silence to end a turn, in seconds. Default `0.4`. */
    minSilenceDuration?: number;
    /** Audio padding around detected speech, in seconds. Default `0.5`. */
    paddingDuration?: number;
    /** Maximum buffered speech, in seconds. Default `60.0`. */
    maxBufferedSpeech?: number;
    /** Model sample rate in Hz (used unless {@link modelSampleRate} is set). Default `16000`. */
    sampleRate?: number;
    /** Sample rate (Hz) of the incoming audio. Default `null` (treated as `48000`). */
    inputSampleRate?: number | null;
    /** Overrides {@link sampleRate} as the model sample rate. Default `null`. */
    modelSampleRate?: number | null;
    /** Exponential smoothing factor for speech probability. Default `0.35`. */
    smoothingFactor?: number;
    /** Force CPU inference. Default `false`. */
    forceCpu?: boolean;
    /** Minimum input volume gate; ignored unless {@link energyFilterEnabled}. Default `0.0`. */
    minVolume?: number;
    /** Enable the energy/volume gate. Default `true`. When `false`, `minVolume` is forced to `0.0`. */
    energyFilterEnabled?: boolean;
    [key: string]: any;
};
declare class SileroVADImpl extends VAD {
    static readonly displayName = "SileroVAD";
    _providerName: string;
    _stopThreshold: number;
    _paddingDuration: number;
    paddingDuration: number;
    _maxBufferedSpeech: number;
    maxBufferedSpeech: number;
    _inputSampleRate: number;
    _smoothingFactor: number;
    smoothingFactor: number;
    _forceCpu: boolean;
    forceCpu: boolean;
    _minVolume: number;
    minVolume: number;
    constructor(opts?: SileroVADOptions);
    getRuntimeConfig(): Record<string, any>;
}
export type SileroVAD = SileroVADImpl;
/** Silero voice-activity detector (VAD). */
export declare const SileroVAD: (opts?: SileroVADOptions) => SileroVAD;
/** No-op; kept for API compatibility (model loading is handled server-side). */
export declare function preDownloadModel(..._args: any[]): void;
export {};