[c56] Support videos hosted on Sohu (closes #8073)

youtube_dl/extractor/c56.py

@@ -4,12 +4,13 @@
 import re
 
 from .common import InfoExtractor
+from ..utils import js_to_json
 
 
 class C56IE(InfoExtractor):
     _VALID_URL = r'https?://(?:(?:www|player)\.)?56\.com/(?:.+?/)?(?:v_|(?:play_album.+-))(?P<textid>.+?)\.(?:html|swf)'
     IE_NAME = '56.com'
-    _TEST = {
+    _TESTS = [{
         'url': 'http://www.56.com/u39/v_OTM0NDA3MTY.html',
         'md5': 'e59995ac63d0457783ea05f93f12a866',
         'info_dict': {
@@ -18,12 +19,29 @@ class C56IE(InfoExtractor):
             'title': '网事知多少 第32期：车怒',
             'duration': 283.813,
         },
-    }
+    }, {
+        'url': 'http://www.56.com/u47/v_MTM5NjQ5ODc2.html',
+        'md5': '',
+        'info_dict': {
+            'id': '82247482',
+            'title': '爱的诅咒之杜鹃花开',
+        },
+        'playlist_count': 7,
+        'add_ie': ['Sohu'],
+    }]
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url, flags=re.VERBOSE)
         text_id = mobj.group('textid')
 
+        webpage = self._download_webpage(url, text_id)
+        sohu_video_info_str = self._search_regex(
+            r'var\s+sohuVideoInfo\s*=\s*({[^}]+});', webpage, 'Sohu video info', default=None)
+        if sohu_video_info_str:
+            sohu_video_info = self._parse_json(
+                sohu_video_info_str, text_id, transform_source=js_to_json)
+            return self.url_result(sohu_video_info['url'], 'Sohu')
+
         page = self._download_json(
             'http://vxml.56.com/json/%s/' % text_id, text_id, 'Downloading video info')