import { Talk, VoicepeakEmotionInput } from '../types/voice';
import { VoiceEngine } from './VoiceEngine';
/**
 * VoicePeak voice synthesis engine
 */
export declare class VoicePeakEngine implements VoiceEngine {
    private apiEndpoint;
    private emotionOverride?;
    private speedOverride?;
    private pitchOverride?;
    fetchAudio(input: Talk, speaker: string): Promise<ArrayBuffer>;
    /**
     * Map emotion style to VoicePeak's emotion parameters
     */
    private mapEmotionStyle;
    getTestMessage(textVoiceText?: string): string;
    /**
     * Set custom API endpoint URL
     * @param apiUrl custom API endpoint URL
     */
    setApiEndpoint(apiUrl: string): void;
    setEmotion(emotion?: VoicepeakEmotionInput): void;
    setSpeed(speed?: number): void;
    setPitch(pitch?: number): void;
    private normalizeInteger;
    private serializeWeights;
    private normalizeEmotionParam;
    private buildUrl;
}