/**
 * Utility functions for handling compressed base64 data from iOS audio recordings
 *
 * iOS returns base64 data in the following formats:
 * - "data:audio/m4a;base64,lzfse:COMPRESSED_DATA" (LZFSE compressed)
 * - "data:audio/m4a;base64,UNCOMPRESSED_DATA" (regular base64)
 */
export interface CompressedBase64Info {
    isCompressed: boolean;
    algorithm?: 'lzfse';
    data: string;
    mimeType: string;
}
/**
 * Parse base64 data to determine if it's compressed and extract metadata
 */
export declare function parseBase64Data(base64String: string): CompressedBase64Info;
/**
 * Get the raw base64 data without compression metadata
 */
export declare function getRawBase64Data(base64String: string): string;
/**
 * Check if base64 data is compressed
 */
export declare function isCompressedBase64(base64String: string): boolean;
/**
 * Get compression information for logging/debugging
 */
export declare function getCompressionInfo(base64String: string): {
    isCompressed: boolean;
    algorithm?: string;
    estimatedOriginalSize?: number;
    compressedSize?: number;
};
/**
 * Convert base64 string to Blob for file operations
 */
export declare function base64ToBlob(base64String: string): Blob;
/**
 * Convert base64 string to data URL for direct use in audio elements
 */
export declare function getDataURL(base64String: string): string;