Function is_media_file_callback

apps/backend/utils.js:73–84

* @brief Check if file is a supported media type (callback version) * * @param file_path [in] Path to media file to check * @param callback [in] Function(err, is_media) * - err: Error object if operation failed * - is_media: Boolean indicating if file is supported * * Supported Ty

(file_path, callback)

 * @note Checks both file existence and MIME type
 */
function is_media_file_callback(file_path, callback) {
  fs.access(file_path, (err) => {
    if (err) {
      logger(LOG_LEVEL.ERROR, `Error accessing audio source file ${err.message}`);
      return callback(null, false);
    }

    const mime_type = mime.lookup(file_path);
    
    callback(null, cfg.media_mime_types.includes(mime_type));
  });
}

/**
 * @brief Get media file duration and metadata (callback version)