X-Git-Url: https://main.carlh.net/gitweb/?p=dcpomatic.git;a=blobdiff_plain;f=src%2Flib%2Fdcpomatic_time.h;h=897b725bd3e63587ba9390f194234847e01aedd1;hp=da903cf09316e0e34865e62a5443a7ff1ba5b64e;hb=8f12e84009d7c2685bb2eeb32665876463d4e6e5;hpb=37494990bbe81f41f581de8258dc7353b82d662d

diff --git a/src/lib/dcpomatic_time.h b/src/lib/dcpomatic_time.h
index da903cf09..897b725bd 100644
--- a/src/lib/dcpomatic_time.h
+++ b/src/lib/dcpomatic_time.h
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2014-2016 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2014-2018 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -28,16 +28,20 @@
 #include "frame_rate_change.h"
 #include "dcpomatic_assert.h"
 #include <boost/optional.hpp>
+#include <boost/foreach.hpp>
 #include <stdint.h>
 #include <cmath>
 #include <ostream>
 #include <iomanip>
 #include <cstdio>
 
-class dcpomatic_round_up_test;
+struct dcpomatic_time_ceil_test;
+struct dcpomatic_time_floor_test;
+
+namespace dcpomatic {
 
 /** A time in seconds, expressed as a number scaled up by Time::HZ.  We want two different
- *  versions of this class, ContentTime and DCPTime, and we want it to be impossible to
+ *  versions of this class, dcpomatic::ContentTime and dcpomatic::DCPTime, and we want it to be impossible to
  *  convert implicitly between the two.  Hence there's this template hack.  I'm not
  *  sure if it's the best way to do it.
  *
@@ -114,14 +118,24 @@ public:
 		return *this;
 	}
 
+	Time<S, O> operator/ (int o) const {
+		return Time<S, O> (_t / o);
+	}
+
 	/** Round up to the nearest sampling interval
 	 *  at some sampling rate.
 	 *  @param r Sampling rate.
 	 */
-	Time<S, O> round_up (float r) const {
-		Type const n = llrintf (HZ / r);
-		Type const a = _t + n - 1;
-		return Time<S, O> (a - (a % n));
+	Time<S, O> ceil (double r) const {
+		return Time<S, O> (llrint (HZ * frames_ceil(r) / r));
+	}
+
+	Time<S, O> floor (double r) const {
+		return Time<S, O> (llrint (HZ * frames_floor(r) / r));
+	}
+
+	Time<S, O> round (double r) const {
+		return Time<S, O> (llrint (HZ * frames_round(r) / r));
 	}
 
 	double seconds () const {
@@ -143,7 +157,7 @@ public:
 
 	template <typename T>
 	int64_t frames_floor (T r) const {
-		return floor (_t * r / HZ);
+		return ::floor (_t * r / HZ);
 	}
 
 	template <typename T>
@@ -152,10 +166,16 @@ public:
 		   the calculation will round down before we get the chance
 		   to ceil().
 		*/
-		return ceil (_t * double(r) / HZ);
+		return ::ceil (_t * double(r) / HZ);
 	}
 
-	/** @param r Frames per second */
+	/** Split a time into hours, minutes, seconds and frames.
+	 *  @param r Frames per second.
+	 *  @param h Returned hours.
+	 *  @param m Returned minutes.
+	 *  @param s Returned seconds.
+	 *  @param f Returned frames.
+	 */
 	template <typename T>
 	void split (T r, int& h, int& m, int& s, int& f) const
 	{
@@ -210,11 +230,13 @@ public:
 		return Time<S, O> (INT64_MAX);
 	}
 
+	static const int HZ = 96000;
+
 private:
-	friend struct dcptime_round_up_test;
+	friend struct ::dcpomatic_time_ceil_test;
+	friend struct ::dcpomatic_time_floor_test;
 
 	Type _t;
-	static const int HZ = 96000;
 };
 
 class ContentTimeDifferentiator {};
@@ -257,7 +279,7 @@ public:
 		return TimePeriod<T> (from + o, to + o);
 	}
 
-	boost::optional<TimePeriod<T> > overlap (TimePeriod<T> const & other) {
+	boost::optional<TimePeriod<T> > overlap (TimePeriod<T> const & other) const {
 		T const max_from = std::max (from, other.from);
 		T const min_to = std::min (to, other.to);
 
@@ -272,6 +294,13 @@ public:
 		return (from <= other && other < to);
 	}
 
+	bool operator< (TimePeriod<T> const & o) const {
+		if (from != o.from) {
+			return from < o.from;
+		}
+		return to < o.to;
+	}
+
 	bool operator== (TimePeriod<T> const & other) const {
 		return from == other.from && to == other.to;
 	}
@@ -281,6 +310,47 @@ public:
 	}
 };
 
+/** @param A Period which is subtracted from.
+ *  @param B Periods to subtract from `A', must be in ascending order of start time and must not overlap.
+ */
+template <class T>
+std::list<TimePeriod<T> > subtract (TimePeriod<T> A, std::list<TimePeriod<T> > const & B)
+{
+	std::list<TimePeriod<T> > result;
+	result.push_back (A);
+
+	BOOST_FOREACH (TimePeriod<T> i, B) {
+		std::list<TimePeriod<T> > new_result;
+		BOOST_FOREACH (TimePeriod<T> j, result) {
+			boost::optional<TimePeriod<T> > ov = i.overlap (j);
+			if (ov) {
+				if (*ov == i) {
+					/* A contains all of B */
+					if (i.from != j.from) {
+						new_result.push_back (TimePeriod<T> (j.from, i.from));
+					}
+					if (i.to != j.to) {
+						new_result.push_back (TimePeriod<T> (i.to, j.to));
+					}
+				} else if (*ov == j) {
+					/* B contains all of A */
+				} else if (i.from < j.from) {
+					/* B overlaps start of A */
+					new_result.push_back (TimePeriod<T> (i.to, j.to));
+				} else if (i.to > j.to) {
+					/* B overlaps end of A */
+					new_result.push_back (TimePeriod<T> (j.from, i.from));
+				}
+			} else {
+				new_result.push_back (j);
+			}
+		}
+		result = new_result;
+	}
+
+	return result;
+}
+
 typedef TimePeriod<ContentTime> ContentTimePeriod;
 typedef TimePeriod<DCPTime> DCPTimePeriod;
 
@@ -292,4 +362,6 @@ std::string to_string (ContentTime t);
 std::string to_string (DCPTime t);
 std::string to_string (DCPTimePeriod p);
 
+}
+
 #endif