_find_jwplayer_data() returns dict or None

This simplifies code for callers of `_find_jwplayer_data()` which no longer have
to run `_parse_json()` on the return value.

It also makes sure that `_find_jwplayer_data()` returns either a `dict` or
`None` and nothing else.

youtube_dl/extractor/common.py

@@ -2161,18 +2161,24 @@ class InfoExtractor(object):
                     })
         return formats
 
-    @staticmethod
-    def _find_jwplayer_data(webpage):
+    def _find_jwplayer_data(self, webpage, video_id=None, transform_source=js_to_json):
         mobj = re.search(
             r'jwplayer\((?P<quote>[\'"])[^\'" ]+(?P=quote)\)\.setup\s*\((?P<options>[^)]+)\)',
             webpage)
         if mobj:
-            return mobj.group('options')
+            try:
+                jwplayer_data = self._parse_json(mobj.group('options'),
+                                                 video_id=video_id,
+                                                 transform_source=transform_source)
+            except ExtractorError:
+                pass
+            else:
+                if isinstance(jwplayer_data, dict):
+                    return jwplayer_data
 
     def _extract_jwplayer_data(self, webpage, video_id, *args, **kwargs):
-        jwplayer_data = self._parse_json(
-            self._find_jwplayer_data(webpage), video_id,
-            transform_source=js_to_json)
+        jwplayer_data = self._find_jwplayer_data(
+            webpage, video_id, transform_source=js_to_json)
         return self._parse_jwplayer_data(
             jwplayer_data, video_id, *args, **kwargs)
 

youtube_dl/extractor/generic.py

@@ -2518,14 +2518,10 @@ class GenericIE(InfoExtractor):
                 self._sort_formats(entry['formats'])
             return self.playlist_result(entries)
 
-        jwplayer_data_str = self._find_jwplayer_data(webpage)
-        if jwplayer_data_str:
-            try:
-                jwplayer_data = self._parse_json(
-                    jwplayer_data_str, video_id, transform_source=js_to_json)
+        jwplayer_data = self._find_jwplayer_data(
+            webpage, video_id, transform_source=js_to_json)
+        if jwplayer_data:
             return self._parse_jwplayer_data(jwplayer_data, video_id)
-            except ExtractorError:
-                pass
 
         def check_video(vurl):
             if YoutubeIE.suitable(vurl):

youtube_dl/extractor/tvnoe.py

@@ -31,9 +31,8 @@ class TVNoeIE(InfoExtractor):
             r'<iframe[^>]+src="([^"]+)"', webpage, 'iframe URL')
 
         ifs_page = self._download_webpage(iframe_url, video_id)
-        jwplayer_data = self._parse_json(
-            self._find_jwplayer_data(ifs_page),
-            video_id, transform_source=js_to_json)
+        jwplayer_data = self._find_jwplayer_data(
+            ifs_page, video_id, transform_source=js_to_json)
         info_dict = self._parse_jwplayer_data(
             jwplayer_data, video_id, require_title=False, base_url=iframe_url)