+ # The following extraction logic is proposed by @Belderak and @gdkchan
+ # and declared to be used freely in youtube-dl
+ # See https://github.com/rg3/youtube-dl/issues/9706
+
+ numbers_js = self._download_webpage(
+ 'https://openload.co/assets/js/obfuscator/n.js', video_id,
+ note='Downloading signature numbers')
+ signums = self._search_regex(
+ r'window\.signatureNumbers\s*=\s*[\'"](?P<data>[a-z]+)[\'"]',
+ numbers_js, 'signature numbers', group='data')
+
+ linkimg_uri = self._search_regex(
+ r'<img[^>]+id="linkimg"[^>]+src="([^"]+)"', webpage, 'link image')
+ linkimg = self._request_webpage(
+ linkimg_uri, video_id, note=False).read()
+
+ width, height, pixels = decode_png(linkimg)
+
+ output = ''
+ for y in range(height):
+ for x in range(width):
+ r, g, b = pixels[y][3 * x:3 * x + 3]
+ if r == 0 and g == 0 and b == 0:
+ break
+ else:
+ output += compat_chr(r)
+ output += compat_chr(g)
+ output += compat_chr(b)
+
+ img_str_length = len(output) // 200
+ img_str = [[0 for x in range(img_str_length)] for y in range(10)]
+
+ sig_str_length = len(signums) // 260
+ sig_str = [[0 for x in range(sig_str_length)] for y in range(10)]
+
+ for i in range(10):
+ for j in range(img_str_length):
+ begin = i * img_str_length * 20 + j * 20
+ img_str[i][j] = output[begin:begin + 20]
+ for j in range(sig_str_length):
+ begin = i * sig_str_length * 26 + j * 26
+ sig_str[i][j] = signums[begin:begin + 26]
+
+ parts = []
+ # TODO: find better names for str_, chr_ and sum_
+ str_ = ''
+ for i in [2, 3, 5, 7]:
+ str_ = ''
+ sum_ = float(99)
+ for j in range(len(sig_str[i])):
+ for chr_idx in range(len(img_str[i][j])):
+ if sum_ > float(122):
+ sum_ = float(98)
+ chr_ = compat_chr(int(math.floor(sum_)))
+ if sig_str[i][j][chr_idx] == chr_ and j >= len(str_):
+ sum_ += float(2.5)
+ str_ += img_str[i][j][chr_idx]
+ parts.append(str_.replace(',', ''))
+
+ video_url = 'https://openload.co/stream/%s~%s~%s~%s' % (parts[3], parts[1], parts[2], parts[0])