playlist提取，优化streamUrl设置

Common.py

@@ -311,7 +311,17 @@ def loginBilibili(force=False):
 
 
 class downloader(XiGuaLiveApi):
-    playlist = None
+    __playlist = None
+
+    @property
+    def playlist(self):
+        return self.__playlist
+
+    @playlist.setter
+    def playlist(self, value):
+        global streamUrl
+        self.__playlist = value
+        streamUrl = value
 
     def _checkUsernameIsMatched(self, compare=None):
         return True
@@ -332,11 +342,9 @@ class downloader(XiGuaLiveApi):
         return _result
 
     def updPlayList(self):
-        global streamUrl
         if self.isLive and "stream_url" in self._rawRoomInfo:
             if 'rtmp_pull_url' in self._rawRoomInfo["stream_url"]:
                 self.playlist = self._rawRoomInfo["stream_url"]['rtmp_pull_url']
-                streamUrl = self.playlist
             elif 'flv_pull_url' in self._rawRoomInfo["stream_url"]:
                 _playlist = self._rawRoomInfo["stream_url"]["flv_pull_url"]
                 if type(_playlist) is dict:
@@ -344,9 +352,7 @@ class downloader(XiGuaLiveApi):
                         self.playlist = _
                         break
                 self.playlist = self.playlist.replace("_hd5", "").replace("_sd5", "").replace("_ld5", "").replace("_md", "")
-                streamUrl = self.playlist
         else:
-            streamUrl = None
             self.playlist = None