import { TTS } from '../../agents/providers.js';
import type { SarvamAITTSModel } from './models.js';
/**
 * Options for {@link SarvamAITTS}.
 *
 * Passing an unknown option throws a `TypeError`.
 */
export type SarvamAITTSOptions = {
    /** Sarvam AI API key. Defaults to the `SARVAM_API_KEY` environment variable. */
    apiKey?: string;
    /** TTS model id. Default `'bulbul:v3'`. */
    model?: SarvamAITTSModel | string;
    /** Language code. Default `'en-IN'`. */
    language?: string;
    /** Speaker/voice id. Default `'shubh'`. */
    speaker?: string;
    /** Stream audio as it is synthesized. Default `true`. */
    streaming?: boolean;
    /** Output audio sample rate in Hz. Default `24000`. */
    sampleRate?: number;
    /** Output audio codec. */
    outputAudioCodec?: string;
    /** Pitch adjustment. Default `0.0`. */
    pitch?: number | null;
    /** Speaking pace multiplier. Default `1.0`. */
    pace?: number | null;
    /** Loudness multiplier. Default `1.0`. */
    loudness?: number | null;
    /** Sampling temperature. Default `0.6`. */
    temperature?: number | null;
    /** Output audio bitrate. Default `'128k'`. */
    bitrate?: string;
    /** Minimum buffer size before emitting audio. */
    minBufferSize?: number;
    /** Maximum characters per synthesis chunk. */
    maxChunkLength?: number;
    /** Enable text preprocessing/normalization. Default `false`. */
    preprocessing?: boolean;
    [key: string]: any;
};
declare class SarvamAITTSImpl extends TTS {
    static readonly displayName = "SarvamAITTS";
    _providerName: string;
    apiKey?: string;
    voiceId: string;
    voice: string;
    model: string;
    language: string;
    streaming: boolean;
    pitch: number | null;
    pace: number | null;
    loudness: number | null;
    temperature: number | null;
    preprocessing: boolean;
    bitrate: string;
    constructor(opts?: SarvamAITTSOptions);
    getRuntimeConfig(): Record<string, any>;
}
export type SarvamAITTS = SarvamAITTSImpl;
/** Sarvam AI text-to-speech (TTS) synthesizer. */
export declare const SarvamAITTS: (opts?: SarvamAITTSOptions) => SarvamAITTS;
export {};