int width() const;
int height() const;
+ // Returns -1 if undefined.
+ int rotation() const;
+
// Returns -1 or an empty string if the value is undefined.
const std::string& album() const;
const std::string& artist() const;
std::string encoded_by_;
std::string genre_;
std::string language_;
+ int rotation_;
std::string title_;
int track_;