[extractor/common] Add expected_type in json ld routines

youtube_dl/extractor/common.py

@@ -805,15 +805,17 @@ class InfoExtractor(object):
         return self._html_search_meta('twitter:player', html,
                                       'twitter card player')
 
-    def _search_json_ld(self, html, video_id, **kwargs):
+    def _search_json_ld(self, html, video_id, expected_type=None, **kwargs):
         json_ld = self._search_regex(
             r'(?s)<script[^>]+type=(["\'])application/ld\+json\1[^>]*>(?P<json_ld>.+?)</script>',
             html, 'JSON-LD', group='json_ld', **kwargs)
         if not json_ld:
             return {}
-        return self._json_ld(json_ld, video_id, fatal=kwargs.get('fatal', True))
+        return self._json_ld(
+            json_ld, video_id, fatal=kwargs.get('fatal', True),
+            expected_type=expected_type)
 
-    def _json_ld(self, json_ld, video_id, fatal=True):
+    def _json_ld(self, json_ld, video_id, fatal=True, expected_type=None):
         if isinstance(json_ld, compat_str):
             json_ld = self._parse_json(json_ld, video_id, fatal=fatal)
         if not json_ld:
@@ -821,6 +823,8 @@ class InfoExtractor(object):
         info = {}
         if json_ld.get('@context') == 'http://schema.org':
             item_type = json_ld.get('@type')
+            if expected_type is not None and expected_type != item_type:
+                return info
             if item_type == 'TVEpisode':
                 info.update({
                     'episode': unescapeHTML(json_ld.get('name')),