Fix progress for Plex media_players (#22224)

* Return current position and last updated timestamp needed by UI

* Add throttling to position updating

* Simplify logic, don't clear position when refreshing

* Use seconds

* Update homeassistant/components/plex/media_player.py

Co-Authored-By: jjlawren <jjlawren@users.noreply.github.com>

* Add throttling to position updating

* Simplify logic, don't clear position when refreshing

homeassistant/components/plex/media_player.py

@@ -322,6 +322,7 @@ def __init__(self, config, device, session, plex_sessions,
         self._media_image_url = None
         self._media_title = None
         self._media_position = None
+        self._media_position_updated_at = None
         # Music
         self._media_album_artist = None
         self._media_album_name = None
@@ -361,7 +362,6 @@ def _clear_media_details(self):
         self._media_duration = None
         self._media_image_url = None
         self._media_title = None
-        self._media_position = None
         # Music
         self._media_album_artist = None
         self._media_album_name = None
@@ -417,7 +417,21 @@ def refresh(self, device, session):
                 self._make = self._player.device
             else:
                 self._is_player_available = False
-            self._media_position = self._session.viewOffset
+
+            # Calculate throttled position for proper progress display.
+            position = int(self._session.viewOffset / 1000)
+            now = dt_util.utcnow()
+            if self._media_position is not None:
+                pos_diff = (position - self._media_position)
+                time_diff = now - self._media_position_updated_at
+                if (pos_diff != 0 and
+                        abs(time_diff.total_seconds() - pos_diff) > 5):
+                    self._media_position_updated_at = now
+                    self._media_position = position
+            else:
+                self._media_position_updated_at = now
+                self._media_position = position
+
             self._media_content_id = self._session.ratingKey
             self._media_content_rating = getattr(
                 self._session, 'contentRating', None)
@@ -426,7 +440,7 @@ def refresh(self, device, session):
 
         if self._is_player_active and self._session is not None:
             self._session_type = self._session.type
-            self._media_duration = self._session.duration
+            self._media_duration = int(self._session.duration / 1000)
             #  title (movie name, tv episode name, music song name)
             self._media_title = self._session.title
             # media type
@@ -621,6 +635,16 @@ def media_duration(self):
         """Return the duration of current playing media in seconds."""
         return self._media_duration
 
+    @property
+    def media_position(self):
+        """Return the duration of current playing media in seconds."""
+        return self._media_position
+
+    @property
+    def media_position_updated_at(self):
+        """When was the position of the current playing media valid."""
+        return self._media_position_updated_at
+
     @property
     def media_image_url(self):
         """Return the image URL of current playing media."""