demux: dash: handle Period Id

modules/demux/dash/mpd/IsoffMainParser.cpp

@@ -99,6 +99,8 @@ void IsoffMainParser::parsePeriods(Node *root)
         parseSegmentInformation(*it, period);
         if((*it)->hasAttribute("start"))
             period->startTime.Set(IsoTime((*it)->getAttributeValue("start")));
+        if((*it)->hasAttribute("id"))
+            period->setId((*it)->getAttributeValue("id"));
         setAdaptationSets(*it, period);
         mpd->addPeriod(period);
     }

modules/demux/dash/mpd/Period.h

@@ -39,7 +39,8 @@ namespace dash
     {
         class MPD;
 
-        class Period : public SegmentInformation
+        class Period : public SegmentInformation,
+                       public UniqueNess<Period>
         {
             public:
                 Period(MPD *);