[limelight] Improve embeds extraction (closes #12761)

* Move extraction code to extractor
* Add extraction for LimelightEmbeddedPlayerFlash embeds
* Extract multiple video

youtube_dl/extractor/generic.py

@@ -85,6 +85,7 @@ from .ustream import UstreamIE
 from .openload import OpenloadIE
 from .videopress import VideoPressIE
 from .rutube import RutubeIE
+from .limelight import LimelightBaseIE
 
 
 class GenericIE(InfoExtractor):
@@ -2483,6 +2484,11 @@ class GenericIE(InfoExtractor):
             return self.url_result(piksel_url, PikselIE.ie_key())
 
         # Look for Limelight embeds
+        limelight_urls = LimelightBaseIE._extract_urls(webpage, url)
+        if limelight_urls:
+            return self.playlist_result(
+                limelight_urls, video_id, video_title, video_description)
+
         mobj = re.search(r'LimelightPlayer\.doLoad(Media|Channel|ChannelList)\(["\'](?P<id>[a-z0-9]{32})', webpage)
         if mobj:
             lm = {