/**
 * 语音合成工具类
 * @class SpeechSynthesisUtil
 * @description 用于处理文字转语音的工具类,包含音频播放、合成等功能
 */
export declare enum EventType {
    STATE_CHANGE = "stateChange",
    SYNTHESIS_START = "synthesisStart",
    SYNTHESIS_END = "synthesisEnd",
    AUDIO_PLAY = "audioPlay",
    AUDIO_END = "audioEnd",
    ERROR = "error",
    PROGRESS = "progress",
    PAUSE = "pause",
    RESUME = "resume"
}
interface State {
    isInterrupted: boolean;
    isStartPlayQueue: boolean;
    isPlaying: boolean;
    isEnded: boolean;
    isError: boolean;
    isPaused: boolean;
    isSynthesizing: boolean;
    needsUserInteraction: boolean;
}
interface SpeechSynthesisOptions {
    API_KEY: string;
    GroupId: string;
    MAX_QUEUE_LENGTH?: number;
    modelConfig?: any;
}
declare class SpeechSynthesisUtil {
    private API_KEY;
    private GroupId;
    private modelConfig;
    private audioContext;
    private audioQueue;
    private audioTextQueue;
    private state;
    private fileManager;
    private pendingAudioUrl;
    private eventListeners;
    private timer;
    private modelContent;
    private MAX_QUEUE_LENGTH;
    private totalAudioCount;
    constructor(options: SpeechSynthesisOptions);
    /**
     * 文字转语音方法
     * @param text - 需要转换的文本
     */
    textToSpeech(text: string): Promise<void>;
    /**
     * 请求语音合成
     * @param text - 需要合成的文本
     * @private
     */
    private requestSynthesis;
    /**
     * 处理音频响应数据
     * @param response - 响应数据
     * @param text - 对应的文本内容
     * @private
     */
    private processAudioResponse;
    /**
     * 写入音频文件
     * @param filePath - 文件路径
     * @param buffer - 音频数据
     * @private
     */
    private writeAudioFile;
    /**
     * 开始播放音频队列
     * @private
     */
    private playAudioQueue;
    /**
     * 安全播放方法
     * @private
     */
    private safePlay;
    /**
     * 手动触发播放
     */
    manualPlay(): Promise<void>;
    /**
     * 绑定音频事件
     * @private
     */
    private bindAudioEvents;
    /**
     * 处理音频播放开始事件
     * @private
     */
    private handleAudioPlay;
    /**
     * 处理音频播放结束事件
     * @private
     */
    private handleAudioEnd;
    /**
     * 处理音频错误事件
     * @private
     */
    private handleAudioError;
    /**
     * 销毁音频上下文
     * @private
     */
    private destroyAudioContext;
    /**
     * 设置状态
     * @private
     */
    private setState;
    /**
     * 获取当前状态
     */
    getState(): State;
    /**
     * 重置所有状态
     */
    reset(): void;
    /**
     * 添加事件监听
     */
    on(event: EventType, callback: Function): void;
    /**
     * 移除事件监听
     */
    off(event: EventType, callback: Function): void;
    /**
     * 触发事件
     * @private
     */
    private emit;
    /**
     * 开始计时
     * @private
     */
    private startTimer;
    /**
     * 结束计时并返回时（毫秒）
     * @private
     */
    private endTimer;
    /**
     * 批量处理文本
     */
    processText(text: string): Promise<void>;
    /**
     * 处理文本分段
     * @private
     */
    private processContent;
    /**
     * 强制处理剩余文本
     */
    flushRemainingText(): Promise<void>;
    /**
     * 重置文本处理状态
     */
    resetTextProcessor(): void;
    /**
     * 暂停播放
     */
    pause(): void;
    /**
     * 恢复播放
     */
    resume(): void;
    /**
     * 切换播放/暂停状态
     */
    togglePlay(): void;
    /**
     * 如果需要，开始播放音频
     * @private
     */
    private startPlayingIfNeeded;
    /**
     * 处理错误
     * @private
     */
    private handleError;
    private calculateProgress;
    /**
     * 判断是否是合适的分段点
     * @private
     */
    private isGoodSplitPoint;
}
export default SpeechSynthesisUtil;