/**
 * TTS Audio Processing Utilities
 *
 * Stateless utility functions for WAV and MP3 audio manipulation.
 * Provides binary-level audio processing without external dependencies.
 */
/**
 * Merge binary WAV data chunks into a single WAV file.
 *
 * Extracts audio data from each chunk, combines them, and creates a new
 * WAV header with correct file size information. Preserves audio format
 * parameters (channels, sample rate, etc.) from the first chunk.
 *
 * @param audioChunks - Array of binary WAV data to merge
 * @returns Merged WAV file as binary data
 */
export declare function mergeWavBinary(audioChunks: Uint8Array[]): Uint8Array;
/**
 * Merge MP3 audio chunks using simple concatenation.
 *
 * This is a practical approach for MP3 merging. For more advanced
 * MP3 merging with proper frame handling, consider using external libraries.
 *
 * @param audioChunks - Array of binary MP3 data to merge
 * @returns Concatenated MP3 data
 */
export declare function mergeMp3Binary(audioChunks: Uint8Array[]): Uint8Array;
/**
 * Remove WAV header from audio data.
 *
 * Used for intermediate chunks when merging multiple WAV files.
 * Finds the "data" chunk and returns only the audio data portion.
 *
 * @param audioData - Binary WAV data with header
 * @returns Binary audio data without header
 */
export declare function removeWavHeader(audioData: Uint8Array): Uint8Array;
/**
 * Remove MP3 ID3 tags (v1 and v2) from audio data.
 *
 * Handles both ID3v2 tags (at the beginning) and ID3v1 tags (at the end).
 * Returns pure MPEG audio data without metadata.
 *
 * @param mp3Data - Binary MP3 data with headers
 * @returns Binary MP3 data without ID3 tags
 */
export declare function removeMp3Header(mp3Data: Uint8Array): Uint8Array;
/**
 * Detect audio format from binary data.
 *
 * Examines the first few bytes to determine if the data is WAV, MP3,
 * or unknown format.
 *
 * @param audioData - Binary audio data
 * @returns Format string: 'wav', 'mp3', or 'unknown'
 */
export declare function detectAudioFormat(audioData: Uint8Array): string;
/**
 * Extract audio data from response object.
 *
 * Handles ReadableStream and direct content types.
 *
 * @param response - Response object
 * @returns Binary audio data
 */
export declare function extractAudioFromResponse(response: any): Promise<Uint8Array>;
/**
 * Extract audio data from multiple responses.
 *
 * @param responses - Array of response objects
 * @returns Array of extracted binary audio data
 */
export declare function extractAudioFromResponses(responses: any[]): Promise<Uint8Array[]>;
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