Add timecode methods to Time

[dcpomatic.git] / src / lib / dcpomatic_time.h

diff --git a/src/lib/dcpomatic_time.h b/src/lib/dcpomatic_time.h
index 1421040733f8c7d709723bc2085828a667354554..4afc9ab40623e09a226965ce8cdfb7e7a77d7784 100644 (file)
--- a/src/lib/dcpomatic_time.h
+++ b/src/lib/dcpomatic_time.h
@@ -22,6 +22,8 @@
 
 #include <cmath>
 #include <ostream>
+#include <sstream>
+#include <iomanip>
 #include <stdint.h>
 #include "frame_rate_change.h"
 
@@ -56,6 +58,42 @@ public:
                return rint (_t * r / HZ);
        }
 
+       template <typename T>
+       void split (T r, int& h, int& m, int& s, int& f) const
+       {
+               /* Do this calculation with frames so that we can round
+                  to a frame boundary at the start rather than the end.
+               */
+               int64_t ff = frames (r);
+               
+               h = ff / (3600 * r);
+               ff -= h * 3600 * r;
+               m = ff / (60 * r);
+               ff -= m * 60 * r;
+               s = ff / r;
+               ff -= s * r;
+
+               f = static_cast<int> (ff);
+       }
+
+       template <typename T>
+       std::string timecode (T r) const {
+               int h;
+               int m;
+               int s;
+               int f;
+               split (r, h, m, s, f);
+
+               std::ostringstream o;
+               o.width (2);
+               o.fill ('0');
+               o << std::setw(2) << std::setfill('0') << h << ":"
+                 << std::setw(2) << std::setfill('0') << m << ":"
+                 << std::setw(2) << std::setfill('0') << s << ":"
+                 << std::setw(2) << std::setfill('0') << f;
+               return o.str ();
+       }
+
 protected:
        friend class dcptime_round_up_test;