Some maths operations with Time.

1 files changed, 127 insertions, 0 deletions

diff --git a/src/dcp_time.cc b/src/dcp_time.cc
index 0cc6b264..bc15c367 100644
--- a/src/dcp_time.cc
+++ b/src/dcp_time.cc
@@ -22,10 +22,15 @@
  */
 
 #include <iostream>
+#include <vector>
+#include <boost/algorithm/string.hpp>
+#include <boost/lexical_cast.hpp>
 #include <cmath>
 #include "dcp_time.h"
+#include "exceptions.h"
 
 using namespace std;
+using namespace boost;
 using namespace libdcp;
 
 Time::Time (int frame, int frames_per_second)
@@ -49,6 +54,20 @@ Time::Time (int frame, int frames_per_second)
 	}
 }
 
+Time::Time (string time)
+{
+	vector<string> b;
+	split (b, time, is_any_of (":"));
+	if (b.size() != 4) {
+		throw DCPReadError ("unrecognised time specification");
+	}
+	
+	h = lexical_cast<int> (b[0]);
+	m = lexical_cast<int> (b[1]);
+	s = lexical_cast<int> (b[2]);
+	t = lexical_cast<int> (b[3]);
+}
+
 bool
 libdcp::operator== (Time const & a, Time const & b)
 {
@@ -77,9 +96,117 @@ libdcp::operator<= (Time const & a, Time const & b)
 	return true;
 }
 
+bool
+libdcp::operator< (Time const & a, Time const & b)
+{
+	if (a.h != b.h) {
+		return a.h < b.h;
+	}
+
+	if (a.m != b.m) {
+		return a.m < b.m;
+	}
+
+	if (a.s != b.s) {
+		return a.s < b.s;
+	}
+
+	if (a.t != b.t) {
+		return a.t < b.t;
+	}
+
+	return true;
+}
+
+bool
+libdcp::operator> (Time const & a, Time const & b)
+{
+	if (a.h != b.h) {
+		return a.h > b.h;
+	}
+
+	if (a.m != b.m) {
+		return a.m > b.m;
+	}
+
+	if (a.s != b.s) {
+		return a.s > b.s;
+	}
+
+	if (a.t != b.t) {
+		return a.t > b.t;
+	}
+
+	return true;
+}
+
 ostream &
 libdcp::operator<< (ostream& s, Time const & t)
 {
 	s << t.h << ":" << t.m << ":" << t.s << "." << t.t;
 	return s;
 }
+
+libdcp::Time
+libdcp::operator+ (Time a, Time const & b)
+{
+	Time r;
+
+	r.t = a.t + b.t;
+	if (r.t >= 250) {
+		r.t -= 250;
+		r.s++;
+	}
+
+	r.s += a.s + b.s;
+	if (r.s >= 60) {
+		r.s -= 60;
+		r.m++;
+	}
+
+	r.m += a.m + b.m;
+	if (r.m >= 60) {
+		r.m -= 60;
+		r.h++;
+	}
+
+	r.h += a.h + b.h;
+
+	return r;
+}
+
+libdcp::Time
+libdcp::operator- (Time a, Time const & b)
+{
+	Time r;
+
+	r.t = a.t - b.t;
+	if (r.t < 0) {
+		r.t += 250;
+		r.s--;
+	}
+
+	r.s += (a.s - b.s);
+	if (r.s < 0) {
+		r.s += 60;
+		r.m--;
+	}
+
+	r.m += (a.m - b.m);
+	if (r.m < 0) {
+		r.m += 60;
+		r.h--;
+	}
+
+	r.h += (a.h - b.h);
+
+	return r;
+}
+
+float
+libdcp::operator/ (Time a, Time const & b)
+{
+	int64_t const at = a.h * 3600 * 250 + a.m * 60 * 250 + a.s * 250 + a.t;
+	int64_t const bt = b.h * 3600 * 250 + b.m * 60 * 250 + b.s * 250 + b.t;
+	return float (at) / bt;
+}