demux: hls: don't compute duration from unloaded playlists

modules/demux/hls/playlist/M3U8.cpp

@@ -56,7 +56,7 @@ bool M3U8::isLive() const
             for(itr = adaptSet->getRepresentations().begin(); itr != adaptSet->getRepresentations().end(); ++itr)
             {
                 const Representation *rep = dynamic_cast<const Representation *>(*itr);
-                if(rep->isLive())
+                if(rep->initialized() && rep->isLive())
                     return true;
             }
         }

modules/demux/hls/playlist/Representation.cpp

@@ -60,6 +60,11 @@ bool Representation::isLive() const
     return b_live;
 }
 
+bool Representation::initialized() const
+{
+    return b_loaded;
+}
+
 void Representation::setPlaylistUrl(const std::string &uri)
 {
     playlistUrl = Url(uri);

modules/demux/hls/playlist/Representation.hpp

@@ -45,6 +45,7 @@ namespace hls
                 void setPlaylistUrl(const std::string &);
                 Url getPlaylistUrl() const;
                 bool isLive() const;
+                bool initialized() const;
                 virtual bool needsUpdate() const;  /* reimpl */
                 virtual void debug(vlc_object_t *, int) const;  /* reimpl */
                 virtual void runLocalUpdates(mtime_t, uint64_t); /* reimpl */