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[letv] Speedup M3U8 decryption

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This commit is contained in:
Yen Chi Hsuan 2016-02-27 00:57:35 +08:00
parent b78b292f0c
commit 2ebd2eac88
1 changed files with 8 additions and 9 deletions
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17
youtube_dl/extractor/letv.py
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@ -94,17 +94,16 @@ def decrypt_m3u8(encrypted_data):
return encrypted_data return encrypted_data
encrypted_data = encrypted_data[5:] encrypted_data = encrypted_data[5:]
_loc4_ = bytearray() _loc4_ = bytearray(2 * len(encrypted_data))
while encrypted_data: for idx, val in enumerate(encrypted_data):
b = compat_ord(encrypted_data[0]) b = compat_ord(val)
_loc4_.extend([b // 16, b & 0x0f]) _loc4_[2 * idx] = b // 16
encrypted_data = encrypted_data[1:] _loc4_[2 * idx + 1] = b % 16
idx = len(_loc4_) - 11 idx = len(_loc4_) - 11
_loc4_ = _loc4_[idx:] + _loc4_[:idx] _loc4_ = _loc4_[idx:] + _loc4_[:idx]
_loc7_ = bytearray() _loc7_ = bytearray(len(encrypted_data))
while _loc4_: for i in range(len(encrypted_data)):
_loc7_.append(_loc4_[0] * 16 + _loc4_[1]) _loc7_[i] = _loc4_[2 * i] * 16 + _loc4_[2 * i + 1]
_loc4_ = _loc4_[2:]
return bytes(_loc7_) return bytes(_loc7_)