Add experimental API mixin

jellyfin_apiclient_python/api.py

@@ -797,6 +797,34 @@ def new_sync_play_v2(self, group_name):
         })
 
 
+class ExperimentalAPIMixin:
+    """
+    This is a location for testing proposed additions to the API Client.
+    """
+    def get_now_playing(self, session_id):
+        """
+        Simplified API to get now playing information for a session including the
+        play state.
+
+        References:
+            https://github.com/jellyfin/jellyfin/issues/9665
+        """
+        resp = self.sessions(params={
+            'Id': session_id,
+            'fields': ['PlayState']
+        })
+        found = None
+        for item in resp:
+            if item['Id'] == session_id:
+                found = item
+        if not found:
+            raise KeyError(f'No session_id={session_id}')
+        play_state = found['PlayState']
+        now_playing = found['NowPlayingItem']
+        now_playing['PlayState'] = play_state
+        return now_playing
+
+
 class API(InternalAPIMixin, BiggerAPIMixin, GranularAPIMixin,
           SyncPlayAPIMixin):
     """