+ LEFT = 0, ///< left
+ RIGHT = 1, ///< right
+ CENTRE = 2, ///< centre
+ LFE = 3, ///< low-frequency effects (sub)
+ LS = 4, ///< left surround
+ RS = 5, ///< right surround
+ HI = 6,
+ VI = 7,
+ LC = 8,
+ RC = 9,
+ BSL = 10,
+ BSR = 11
+};
+
+enum ContentKind
+{
+ FEATURE,
+ SHORT,
+ TRAILER,
+ TEST,
+ TRANSITIONAL,
+ RATING,
+ TEASER,
+ POLICY,
+ PUBLIC_SERVICE_ANNOUNCEMENT,
+ ADVERTISEMENT
+};
+
+enum Effect
+{
+ NONE,
+ BORDER,
+ SHADOW
+};
+
+extern std::string effect_to_string (Effect e);
+extern Effect string_to_effect (std::string s);
+
+enum HAlign
+{
+ HALIGN_LEFT, ///< horizontal position is distance from left of screen to left of subtitle
+ HALIGN_CENTER, ///< horizontal position is distance from centre of screen to centre of subtitle
+ HALIGN_RIGHT, ///< horizontal position is distance from right of screen to right of subtitle
+};
+
+extern std::string halign_to_string (HAlign a);
+extern HAlign string_to_halign (std::string s);
+
+enum VAlign
+{
+ VALIGN_TOP, ///< vertical position is distance from top of screen to top of subtitle
+ VALIGN_CENTER, ///< vertical position is distance from centre of screen to centre of subtitle
+ VALIGN_BOTTOM ///< vertical position is distance from bottom of screen to bottom of subtitle
+};
+
+extern std::string valign_to_string (VAlign a);
+extern VAlign string_to_valign (std::string s);
+
+enum Eye
+{
+ EYE_LEFT,
+ EYE_RIGHT
+};
+
+/** @class Fraction
+ * @brief A fraction (i.e. a thing with an integer numerator and an integer denominator).
+ */
+class Fraction
+{
+public:
+ /** Construct a fraction of 0/0 */
+ Fraction () : numerator (0), denominator (0) {}
+ Fraction (std::string s);
+ /** Construct a fraction with a specified numerator and denominator.
+ * @param n Numerator.
+ * @param d Denominator.
+ */
+ Fraction (int n, int d) : numerator (n), denominator (d) {}
+
+ float as_float () const {
+ return float (numerator) / denominator;
+ }
+
+ std::string as_string () const;
+
+ int numerator;
+ int denominator;
+};
+
+extern bool operator== (Fraction const & a, Fraction const & b);
+extern bool operator!= (Fraction const & a, Fraction const & b);
+extern std::ostream& operator<< (std::ostream& s, Fraction const & f);
+
+/** @struct EqualityOptions
+ * @brief A class to describe what "equality" means for a particular test.
+ *
+ * When comparing things, we want to be able to ignore some differences;
+ * this class expresses those differences.
+ */
+struct EqualityOptions
+{
+ /** Construct an EqualityOptions where nothing at all can differ */
+ EqualityOptions ()
+ : max_mean_pixel_error (0)
+ , max_std_dev_pixel_error (0)
+ , max_audio_sample_error (0)
+ , cpl_annotation_texts_can_differ (false)
+ , reel_annotation_texts_can_differ (false)
+ , reel_hashes_can_differ (false)
+ , issue_dates_can_differ (false)
+ , keep_going (false)
+ {}
+
+ /** The maximum allowable mean difference in pixel value between two images */
+ double max_mean_pixel_error;
+ /** The maximum standard deviation of the differences in pixel value between two images */
+ double max_std_dev_pixel_error;
+ /** The maximum difference in audio sample value between two soundtracks */
+ int max_audio_sample_error;
+ /** true if the <AnnotationText> nodes of CPLs are allowed to differ */
+ bool cpl_annotation_texts_can_differ;
+ /** true if the <AnnotationText> nodes of Reels are allowed to differ */
+ bool reel_annotation_texts_can_differ;
+ /** true if <Hash>es in Reels can differ */
+ bool reel_hashes_can_differ;
+ /** true if IssueDate nodes can differ */
+ bool issue_dates_can_differ;
+ bool keep_going;
+};
+
+/* I've been unable to make mingw happy with ERROR as a symbol, so
+ I'm using a DCP_ prefix here.
+*/
+enum NoteType {
+ DCP_PROGRESS,
+ DCP_ERROR,
+ DCP_NOTE
+};
+
+enum Standard {
+ INTEROP,
+ SMPTE