/**
 * Represents a single phoneme and its merging behavior.
 */
export interface PhonemeToken {
    phoneme: string;
    mergeWithNext: boolean;
}
/**
 * Interface for analyzing text into phoneme tokens.
 */
export interface TextAnalyzer {
    analyze(text: string): PhonemeToken[][];
}
/**
 * Interface for providing audio samples for phonemes.
 */
export interface Sampler {
    sampleRate: number | undefined;
    load(): Promise<void>;
    getSample(phoneme: string): Promise<Float32Array | undefined>;
    loadSample(phoneme: string, buffer: Float32Array): Promise<void>;
    isCached(phoneme: string): boolean;
}
/**
 * Interface for applying audio effects like pitch shifting.
 */
export interface AudioEffect {
    pitch?: number;
    speed?: number;
    randomness?: number;
    calculatePitch(charIndex: number): number;
    apply(buffer: Float32Array, pitchRatio: number): Float32Array;
}
/**
 * Interface for playing synthesized audio buffers.
 */
export interface PlaybackStrategy {
    volume: number;
}
export interface AudioPlaybackStrategy extends PlaybackStrategy {
    play(buffer: Float32Array): Promise<void>;
    drainAndPlay(buffers: Float32Array[]): Promise<void>;
}
export interface FilePlaybackStrategy extends PlaybackStrategy {
    play(buffer: Float32Array, outputDir: string): Promise<string>;
    drainAndPlay(buffers: Float32Array[], outputDir: string): Promise<string>;
}
/**
 * Represents the output of a single synthesized character.
 */
export interface SynthesisOutput {
    char: string;
    phoneme: string;
    pitch: number;
    buffer: Float32Array | Int16Array;
}