Fix Plex Companion device restarting playback when reconnecting to PKC

resources/lib/playlist_func.py

@@ -129,6 +129,21 @@ class Playqueue_Object(object):
         self.kodi_playlist_playback = False
         LOG.debug('Playlist cleared: %s', self)
 
+    def position_from_plex_id(self, plex_id):
+        """
+        Returns the position [int] for the very first item with plex_id [int]
+        (Plex seems uncapable of adding the same element multiple times to a
+        playqueue or playlist)
+
+        Raises KeyError if not found
+        """
+        for position, item in enumerate(self.items):
+            if item.plex_id == plex_id:
+                break
+        else:
+            raise KeyError('Did not find plex_id %s in %s', plex_id, self)
+        return position
+
 
 class Playlist_Item(object):
     """

resources/lib/plex_companion.py

@@ -55,7 +55,16 @@ def update_playqueue_from_PMS(playqueue,
         except AttributeError:
             LOG.error('Could now download playqueue %s', playqueue_id)
             return
-        playqueue.clear()
+        if playqueue.id == playqueue_id:
+            # This seems to be happening ONLY if a Plex Companion device
+            # reconnects and Kodi is already playing something - silly, really
+            # For all other cases, a new playqueue is generated by Plex
+            LOG.debug('Update for existing playqueue detected')
+            new = False
+        else:
+            new = True
+            playqueue.clear()
+        # Get new metadata for the playqueue first
         try:
             PL.get_playlist_details_from_xml(playqueue, xml)
         except PL.PlaylistError:
@@ -63,10 +72,33 @@ def update_playqueue_from_PMS(playqueue,
             return
         playqueue.repeat = 0 if not repeat else int(repeat)
         playqueue.plex_transient_token = transient_token
-        playback.play_xml(playqueue,
+        if new:
-                          xml,
+            playback.play_xml(playqueue,
-                          offset=offset,
+                              xml,
-                          start_plex_id=start_plex_id)
+                              offset=offset,
+                              start_plex_id=start_plex_id)
+            return
+        # Updates to playqueues could potentially become a bit more ugly...
+        if app.APP.is_playing:
+            try:
+                playerid = js.get_player_ids()[0]
+            except IndexError:
+                LOG.error('Unexpectately could not get Kodi player id')
+                return
+            if app.PLAYSTATE.player_states[playerid]['plex_id'] == start_plex_id:
+                # Nothing to do - let's not seek to avoid jumps in playback
+                return
+            pos = playqueue.position_from_plex_id(start_plex_id)
+            LOG.debug('Skipping to position %s for %s', pos, playqueue)
+            js.skipto(pos)
+            if offset:
+                js.seek_to(offset)
+            return
+        # Need to initiate playback again using our existing playqueue
+        app.APP.player.play(playqueue.kodi_pl,
+                            None,
+                            False,
+                            playqueue.position_from_plex_id(start_plex_id))
 
 
 class PlexCompanion(backgroundthread.KillableThread):
@@ -165,7 +197,7 @@ class PlexCompanion(backgroundthread.KillableThread):
         update_playqueue_from_PMS(playqueue,
                                   playqueue_id=container_key,
                                   repeat=query.get('repeat'),
-                                  offset=data.get('offset'),
+                                  offset=utils.cast(int, data.get('offset')),
                                   transient_token=data.get('token'),
                                   start_plex_id=key)