/** Configuration for {@link UltravoxRealtime}. */
export type UltravoxLiveConfig = {
    /** Model id. Default `'fixie-ai/ultravox'`. */
    model?: string;
    /** Voice id. Default `null` (sent as empty string). */
    voice?: string | null;
    /** Language hint code. Default `'en'`. */
    languageHint?: string;
    /** Sampling temperature. Default `null` (omitted). */
    temperature?: number | null;
    /** Maximum session duration (e.g. `'300s'`). Default `null`. */
    maxDuration?: string | null;
    /** Message spoken when `maxDuration` is exceeded. Default `null`. */
    timeExceededMessage?: string | null;
    /** Sample rate (Hz) of the audio sent in. Default `48000`. */
    inputSampleRate?: number;
    /** Sample rate (Hz) of synthesized audio. Default `24000`. */
    outputSampleRate?: number;
    /** Client-side audio buffer size in ms. Default `30000`. */
    clientBufferSizeMs?: number;
    /** Silence (ms) before a turn ends. Default `800`; `null` omits the param. */
    vadTurnEndpointDelayMs?: number | null;
    /** Minimum turn duration in ms. Default `600`; `null` omits the param. */
    vadMinimumTurnDurationMs?: number | null;
    /** Minimum interruption duration in ms. Default `null`. */
    vadMinimumInterruptionDurationMs?: number | null;
    /** Per-frame VAD activation threshold in [0, 1]. Default `0.4`; `null` omits the param. */
    vadFrameActivationThreshold?: number | null;
    /** Who speaks first, e.g. `'FIRST_SPEAKER_USER'`. Default `'FIRST_SPEAKER_USER'`. */
    firstSpeaker?: string | null;
    /** Have the agent open with a greeting prompt. Default `false`. */
    enableGreetingPrompt?: boolean;
    /** Override the API base URL. Default `null`. */
    baseUrl?: string | null;
};
interface ResolvedConfig {
    model: string;
    voice: string | null;
    languageHint: string;
    temperature: number | null;
    maxDuration: string | null;
    timeExceededMessage: string | null;
    inputSampleRate: number;
    outputSampleRate: number;
    clientBufferSizeMs: number;
    vadTurnEndpointDelayMs: number | null;
    vadMinimumTurnDurationMs: number | null;
    vadMinimumInterruptionDurationMs: number | null;
    vadFrameActivationThreshold: number | null;
    firstSpeaker: string | null;
    enableGreetingPrompt: boolean;
    baseUrl: string | null;
}
declare class UltravoxRealtimeImpl {
    static readonly displayName = "UltravoxRealtime";
    _providerName: string;
    _isRealtimeModel: boolean;
    apiKey?: string;
    config: ResolvedConfig;
    model: string;
    voice: string;
    params: Record<string, string>;
    constructor(opts?: {
        apiKey?: string;
        config?: UltravoxLiveConfig | null;
        [key: string]: any;
    });
    close(): Promise<void>;
    cleanup(): Promise<void>;
    getRuntimeConfig(): Record<string, any>;
}
export type UltravoxRealtime = UltravoxRealtimeImpl;
/**
 * Ultravox realtime speech-to-speech (S2S) model.
 *
 * @param opts.apiKey Ultravox API key; defaults to the `ULTRAVOX_API_KEY` env var.
 * @param opts.config Session configuration; see {@link UltravoxLiveConfig}.
 */
export declare const UltravoxRealtime: (opts?: {
    apiKey?: string;
    config?: UltravoxLiveConfig | null;
    [key: string]: any;
}) => UltravoxRealtime;
export {};