1 files changed, 19 insertions, 4 deletions
diff --git a/src/lib/dcpomatic_time.h b/src/lib/dcpomatic_time.h
index 05b4e1a5d..b19a94ad7 100644
--- a/src/lib/dcpomatic_time.h
+++ b/src/lib/dcpomatic_time.h
@@ -21,6 +21,7 @@
 #define DCPOMATIC_TIME_H
 
 #include <cmath>
+#include <ostream>
 #include <stdint.h>
 #include "frame_rate_change.h"
 
@@ -55,10 +56,6 @@ public:
 		return rint (_t * r / HZ);
 	}
 
-	operator bool () const {
-		return _t != 0;
-	}
-
 protected:
 	friend class dcptime_round_up_test;
 	
@@ -109,6 +106,10 @@ public:
 		return *this;
 	}
 
+	ContentTime operator- () const {
+		return ContentTime (-_t);
+	}
+
 	ContentTime operator- (ContentTime const & o) const {
 		return ContentTime (_t - o._t);
 	}
@@ -118,6 +119,17 @@ public:
 		return *this;
 	}
 
+	/** Round up to the nearest sampling interval
+	 *  at some sampling rate.
+	 *  @param r Sampling rate.
+	 */
+	ContentTime round_up (int r) {
+		int64_t const n = HZ / r;
+		int64_t const a = _t + n - 1;
+		return ContentTime (a - (a % n));
+	}
+	
+
 	static ContentTime from_seconds (double s) {
 		return ContentTime (s * HZ);
 	}
@@ -128,6 +140,8 @@ public:
 	}
 };
 
+std::ostream& operator<< (std::ostream& s, ContentTime t);
+
 class DCPTime : public Time
 {
 public:
@@ -210,5 +224,6 @@ public:
 };
 
 DCPTime min (DCPTime a, DCPTime b);
+std::ostream& operator<< (std::ostream& s, DCPTime t);
 
 #endif