/**
 * Audio Processor - v1.0.0
 * Audio transcription/synthesis wrappers with format detection, duration, split.
 */
export type AudioFormat = 'wav' | 'mp3' | 'ogg' | 'flac' | 'webm' | 'aac' | 'unknown';
export interface TranscribeOptions {
    language?: string;
    model?: string;
    provider?: string;
}
export interface SynthesizeOptions {
    voice?: string;
    speed?: number;
    format?: AudioFormat;
    provider?: string;
}
export interface TranscribeResult {
    text: string;
    language?: string;
    duration?: number;
    segments?: {
        start: number;
        end: number;
        text: string;
    }[];
}
export interface SynthesizeResult {
    audio: Buffer;
    format: AudioFormat;
    duration?: number;
}
export type TranscribeFunction = (audio: Buffer, options?: TranscribeOptions) => Promise<TranscribeResult>;
export type SynthesizeFunction = (text: string, options?: SynthesizeOptions) => Promise<SynthesizeResult>;
export declare class AudioProcessor {
    private transcribeFn?;
    private synthesizeFn?;
    constructor(options?: {
        transcribe?: TranscribeFunction;
        synthesize?: SynthesizeFunction;
    });
    /** Detect audio format from buffer header */
    static detectFormat(audio: Buffer): AudioFormat;
    /** Estimate duration in seconds for WAV files (for others returns undefined) */
    static estimateDuration(audio: Buffer): number | undefined;
    /** Split audio buffer into chunks of roughly `chunkBytes` size */
    static split(audio: Buffer, chunkBytes: number): Buffer[];
    transcribe(audio: Buffer, options?: TranscribeOptions): Promise<TranscribeResult>;
    synthesize(text: string, options?: SynthesizeOptions): Promise<SynthesizeResult>;
}
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