youtube-dl

commit 2ebd2eac880e21e0fe9751e6cef28ac009f69d79
parent b78b292f0c51323edaf3e18ae4f45927a55e9198
Author: Yen Chi Hsuan <yan12125@gmail.com>
Date:   Sat, 27 Feb 2016 00:57:35 +0800

[letv] Speedup M3U8 decryption

Diffstat:
M
youtube_dl/extractor/letv.py
 | 
17
++++++++---------

1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/youtube_dl/extractor/letv.py b/youtube_dl/extractor/letv.py
@@ -94,17 +94,16 @@ class LetvIE(InfoExtractor):
             return encrypted_data
         encrypted_data = encrypted_data[5:]
 
-        _loc4_ = bytearray()
-        while encrypted_data:
-            b = compat_ord(encrypted_data[0])
-            _loc4_.extend([b // 16, b & 0x0f])
-            encrypted_data = encrypted_data[1:]
+        _loc4_ = bytearray(2 * len(encrypted_data))
+        for idx, val in enumerate(encrypted_data):
+            b = compat_ord(val)
+            _loc4_[2 * idx] = b // 16
+            _loc4_[2 * idx + 1] = b % 16
         idx = len(_loc4_) - 11
         _loc4_ = _loc4_[idx:] + _loc4_[:idx]
-        _loc7_ = bytearray()
-        while _loc4_:
-            _loc7_.append(_loc4_[0] * 16 + _loc4_[1])
-            _loc4_ = _loc4_[2:]
+        _loc7_ = bytearray(len(encrypted_data))
+        for i in range(len(encrypted_data)):
+            _loc7_[i] = _loc4_[2 * i] * 16 + _loc4_[2 * i + 1]
 
         return bytes(_loc7_)