/**
 * OpenAI TTS configuration parameters.
 */
export interface OpenAiTtsParams {
    /** OpenAI API key. Optional for preset-backed OpenAI TTS usage. */
    api_key?: string;
    /** Endpoint URL for the OpenAI TTS service. */
    base_url?: string;
    /** Voice name (e.g., "alloy", "echo", "fable", "onyx", "nova", "shimmer") */
    voice: string;
    /** Model name (e.g., "tts-1", "tts-1-hd") */
    model?: string;
    /** Custom instructions for voice style, accent, pace, and tone. */
    instructions?: string;
    /** Speaking rate multiplier. */
    speed?: number;
    /** Accepts any additional properties */
    [key: string]: any;
}