From a38436e8898b6eca29d9279346e6e2136ec0bc8f Mon Sep 17 00:00:00 2001
From: Yen Chi Hsuan <yan12125@gmail.com>
Date: Fri, 17 Jul 2015 12:02:49 +0800
Subject: [PATCH] [extractor/common] Add 'transform_source' parameter to
 _extract_f4m_formats()

---
 youtube_dl/extractor/common.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/youtube_dl/extractor/common.py b/youtube_dl/extractor/common.py
index 271bf8596..5a2d0d995 100644
--- a/youtube_dl/extractor/common.py
+++ b/youtube_dl/extractor/common.py
@@ -836,13 +836,14 @@ def _sleep(self, timeout, video_id, msg_template=None):
         self.to_screen(msg)
         time.sleep(timeout)
 
-    def _extract_f4m_formats(self, manifest_url, video_id, preference=None, f4m_id=None):
+    def _extract_f4m_formats(self, manifest_url, video_id, preference=None, f4m_id=None,
+                             transform_source=lambda s: fix_xml_ampersands(s).strip()):
         manifest = self._download_xml(
             manifest_url, video_id, 'Downloading f4m manifest',
             'Unable to download f4m manifest',
             # Some manifests may be malformed, e.g. prosiebensat1 generated manifests
             # (see https://github.com/rg3/youtube-dl/issues/6215#issuecomment-121704244)
-            transform_source=lambda s: fix_xml_ampersands(s).strip())
+            transform_source=transform_source)
 
         formats = []
         manifest_version = '1.0'