/**
 * Create WAV header for 16-bit PCM audio
 */
export declare function createWavHeader(dataLength: number, sampleRate: number): Buffer;
/**
 * Convert Int16Array to Buffer
 */
export declare function int16ArrayToBuffer(samples: number[]): Buffer;
/**
 * Create and save WAV file
 */
export declare function createWav(audioBuffer: number[], sampleRate: number, filename: string): void;
/**
 * Play a WAV buffer by streaming it into ffplay over stdin.
 *
 * ffplay ships with ffmpeg and is cross-platform (macOS/Linux/Windows), so
 * we avoid the old "write to /tmp then shell out to afplay/aplay/powershell"
 * dance — no temp files, no platform switch, no hardcoded /tmp path (which
 * doesn't exist on Windows). Requires ffplay on PATH.
 */
/**
 * Play one mono s16le PCM chunk (as a minimal WAV) and wait for the player to finish.
 * Chunks are played sequentially when awaited in order — suitable for streaming TTS output.
 */
export declare function playPcmInt16Chunk(samples: number[], sampleRate: number): Promise<void>;
export declare function playAudio(audioBuffer: Buffer): void;
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