Adding a timestamp to Session instanciation

Used to compute runtime of a session

Session.cpp

@@ -59,6 +59,7 @@ Session::Session() : active_(true), filename_(""), failedSource_(nullptr), fadin
     config_[View::TEXTURE]->translation_ = Settings::application.views[View::TEXTURE].default_translation;
 
     snapshots_.xmlDoc_ = new tinyxml2::XMLDocument;
+    start_time_ = gst_util_get_timestamp ();
 }
 
 
@@ -87,6 +88,11 @@ Session::~Session()
     delete snapshots_.xmlDoc_;
 }
 
+uint64_t Session::runtime() const
+{
+    return gst_util_get_timestamp () - start_time_;
+}
+
 void Session::setActive (bool on)
 {
     if (active_ != on) {

Session.h

@@ -74,6 +74,7 @@ public:
 
     // update all sources and mark sources which failed
     void update (float dt);
+    uint64_t runtime() const;
 
     // update mode (active or not)
     void setActive (bool on);
@@ -159,6 +160,7 @@ protected:
     float fading_target_;
     std::mutex access_;
     FrameBufferImage *thumbnail_;
+    uint64_t start_time_;
 };