demux: adaptative: add segment comparison

modules/demux/adaptative/playlist/Segment.cpp

@@ -112,6 +112,26 @@ bool ISegment::contains(size_t byte) const
             (!endByte || byte <= endByte) );
 }
 
+int ISegment::compare(ISegment *other) const
+{
+    if(startTime.Get() != VLC_TS_INVALID)
+    {
+        int64_t diff = startTime.Get() - other->startTime.Get();
+        if(diff)
+            return diff / diff;
+    }
+
+    size_t diff = startByte - other->startByte;
+    if(diff)
+        return diff / diff;
+
+    diff = endByte - other->endByte;
+    if(diff)
+        return diff / diff;
+
+    return 0;
+}
+
 int ISegment::getClassId() const
 {
     return classId;

modules/demux/adaptative/playlist/Segment.h

@@ -58,6 +58,7 @@ namespace adaptative
                 virtual void                            addSubSegment   (SubSegment *) = 0;
                 virtual void                            debug           (vlc_object_t *,int = 0) const;
                 virtual bool                            contains        (size_t byte) const;
+                virtual int                             compare         (ISegment *) const;
                 int                                     getClassId      () const;
                 Property<mtime_t>       startTime;
                 Property<mtime_t>       duration;