1 from __future__ import unicode_literals
7 from Crypto.Cipher import AES
8 can_decrypt_frag = True
10 can_decrypt_frag = False
12 from .fragment import FragmentFD
13 from .external import FFmpegFD
15 from ..compat import (
22 parse_m3u8_attributes,
27 class HlsFD(FragmentFD):
28 """ A limited implementation that does not require ffmpeg """
33 def can_download(manifest):
34 UNSUPPORTED_FEATURES = (
35 r'#EXT-X-KEY:METHOD=(?!NONE|AES-128)', # encrypted streams [1]
36 r'#EXT-X-BYTERANGE', # playlists composed of byte ranges of media files [2]
38 # Live streams heuristic does not always work (e.g. geo restricted to Germany
39 # http://hls-geo.daserste.de/i/videoportal/Film/c_620000/622873/format,716451,716457,716450,716458,716459,.mp4.csmil/index_4_av.m3u8?null=0)
40 # r'#EXT-X-MEDIA-SEQUENCE:(?!0$)', # live streams [3]
42 # This heuristic also is not correct since segments may not be appended as well.
43 # Twitch vods of finished streams have EXT-X-PLAYLIST-TYPE:EVENT despite
44 # no segments will definitely be appended to the end of the playlist.
45 # r'#EXT-X-PLAYLIST-TYPE:EVENT', # media segments may be appended to the end of
46 # # event media playlists [4]
48 # 1. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.4
49 # 2. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.2
50 # 3. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.2
51 # 4. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.5
53 check_results = [not re.search(feature, manifest) for feature in UNSUPPORTED_FEATURES]
54 check_results.append(can_decrypt_frag or '#EXT-X-KEY:METHOD=AES-128' not in manifest)
55 return all(check_results)
57 def real_download(self, filename, info_dict):
58 man_url = info_dict['url']
59 self.to_screen('[%s] Downloading m3u8 manifest' % self.FD_NAME)
60 manifest = self.ydl.urlopen(man_url).read()
62 s = manifest.decode('utf-8', 'ignore')
64 if not self.can_download(s):
66 'hlsnative has detected features it does not support, '
67 'extraction will be delegated to ffmpeg')
68 fd = FFmpegFD(self.ydl, self.params)
69 for ph in self._progress_hooks:
70 fd.add_progress_hook(ph)
71 return fd.real_download(filename, info_dict)
74 for line in s.splitlines():
76 if line and not line.startswith('#'):
81 'total_frags': total_frags,
84 self._prepare_and_start_frag_download(ctx)
87 extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url')
88 if extra_param_to_segment_url:
89 extra_query = compat_urlparse.parse_qs(extra_param_to_segment_url)
92 decrypt_info = {'METHOD': 'NONE'}
94 for line in s.splitlines():
97 if not line.startswith('#'):
100 if re.match(r'^https?://', line)
101 else compat_urlparse.urljoin(man_url, line))
102 frag_filename = '%s-Frag%d' % (ctx['tmpfilename'], i)
104 frag_url = update_url_query(frag_url, extra_query)
105 success = ctx['dl'].download(frag_filename, {'url': frag_url})
108 down, frag_sanitized = sanitize_open(frag_filename, 'rb')
109 frag_content = down.read()
111 if decrypt_info['METHOD'] == 'AES-128':
112 iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', media_sequence)
113 frag_content = AES.new(
114 decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content)
115 ctx['dest_stream'].write(frag_content)
116 frags_filenames.append(frag_sanitized)
117 # We only download the first fragment during the test
118 if self.params.get('test', False):
122 elif line.startswith('#EXT-X-KEY'):
123 decrypt_info = parse_m3u8_attributes(line[11:])
124 if decrypt_info['METHOD'] == 'AES-128':
125 if 'IV' in decrypt_info:
126 decrypt_info['IV'] = binascii.unhexlify(decrypt_info['IV'][2:].zfill(32))
127 if not re.match(r'^https?://', decrypt_info['URI']):
128 decrypt_info['URI'] = compat_urlparse.urljoin(
129 man_url, decrypt_info['URI'])
131 decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_query)
132 decrypt_info['KEY'] = self.ydl.urlopen(decrypt_info['URI']).read()
133 elif line.startswith('#EXT-X-MEDIA-SEQUENCE'):
134 media_sequence = int(line[22:])
136 self._finish_frag_download(ctx)
138 for frag_file in frags_filenames:
139 os.remove(encodeFilename(frag_file))