/**
 * TTS Phoneme Processing Utilities
 *
 * Stateless utility functions for phoneme data merging and timing adjustment.
 * These functions handle the synchronization of phoneme timing data across
 * multiple audio chunks.
 */
export interface PhonemeData {
    symbols: string[];
    durations_seconds: number[];
    start_times_seconds: number[];
}
/**
 * Merge multiple phoneme data chunks with automatic time offset adjustment.
 *
 * Handles the merging of phoneme data from multiple TTS chunks, ensuring
 * continuous timing by adjusting start times and maintaining duration
 * offsets. The first chunk's start time is normalized to 0, and
 * subsequent chunks are offset accordingly.
 *
 * @param phonemeChunks - Array of phoneme dictionaries
 * @returns Merged phoneme dictionary with adjusted timing
 */
export declare function mergePhonemeData(phonemeChunks: Partial<PhonemeData>[]): PhonemeData;
/**
 * Apply time offset to phoneme start times.
 *
 * Creates a new phoneme dictionary with start times shifted by the
 * specified offset. Useful for sequential streaming scenarios.
 *
 * @param phonemeData - Phoneme dictionary with timing data
 * @param offset - Time offset in seconds to add to all start times
 * @returns New phoneme dictionary with adjusted start times
 */
export declare function adjustPhonemeTiming(phonemeData: Partial<PhonemeData>, offset: number): PhonemeData;
/**
 * Create an empty phoneme dictionary with standard structure.
 *
 * @returns Empty phoneme dictionary
 */
export declare function createEmptyPhonemeDict(): PhonemeData;
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