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import sys, os
import shutil
from Crypto.Cipher import AES
def parse_m3u8_file(m3u8_file):
with open(m3u8_file, 'rb') as fp:
current_line = fp.readline().rstrip('\n')
while (current_line):
if current_line.startswith('#EXT-X-KEY'):
comps = current_line.split(',')
URI = comps[1][5:-1]
IV = comps[2][5:].rstrip('\n')
with open(URI, 'rb') as urifp:
KEY = urifp.readline().rstrip('\n')
fp.readline()
ts_file = fp.readline().rstrip('\n')
yield (IV, KEY, ts_file)
current_line = fp.readline()
def decrypt(ciphertext, key, iv):
cipher = AES.new(key, AES.MODE_CBC, iv)
plaintext = cipher.decrypt(ciphertext[AES.block_size:])
return plaintext.rstrip(b"\0")
def decrypt_aes_128_ts_file(iv, key, ts_file):
print(iv, key, ts_file)
out = ts_file[:-2]+'.tsd'
if os.path.exists(out):
return out
with open(ts_file, 'rb') as fo:
ciphertext = fo.read()
dec = decrypt(ciphertext, key, iv.decode('hex'))
with open(out, 'wb') as fo:
fo.write(dec)
return out
if __name__ == '__main__':
if len(sys.argv) != 2:
print('Usage: python %s m3u8_file' % sys.argv[0])
sys.exit(1)
m3u8 = sys.argv[1]
if not os.path.exists(m3u8) or not m3u8.endswith('.m3u8'):
print('Input file should be a m3u8 file.')
sys.exit(1)
tsd_files = []
for (iv, key, ts_file) in parse_m3u8_file(m3u8):
tsd_files.append(decrypt_aes_128_ts_file(iv, key, ts_file))
with open(m3u8[:-4]+'ts', 'wb') as merged:
for ts_file in tsd_files:
with open(ts_file, 'rb') as mergefile:
shutil.copyfileobj(mergefile, merged)
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