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[youtubedl] / youtube_dl / downloader / hls.py
1 from __future__ import unicode_literals
2
3 import re
4 import binascii
5 try:
6 from Crypto.Cipher import AES
7 can_decrypt_frag = True
8 except ImportError:
9 can_decrypt_frag = False
10
11 from .fragment import FragmentFD
12 from .external import FFmpegFD
13
14 from ..compat import (
15 compat_urllib_error,
16 compat_urlparse,
17 compat_struct_pack,
18 )
19 from ..utils import (
20 parse_m3u8_attributes,
21 update_url_query,
22 )
23
24
25 class HlsFD(FragmentFD):
26 """ A limited implementation that does not require ffmpeg """
27
28 FD_NAME = 'hlsnative'
29
30 @staticmethod
31 def can_download(manifest, info_dict):
32 UNSUPPORTED_FEATURES = (
33 r'#EXT-X-KEY:METHOD=(?!NONE|AES-128)', # encrypted streams [1]
34 # r'#EXT-X-BYTERANGE', # playlists composed of byte ranges of media files [2]
35
36 # Live streams heuristic does not always work (e.g. geo restricted to Germany
37 # 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)
38 # r'#EXT-X-MEDIA-SEQUENCE:(?!0$)', # live streams [3]
39
40 # This heuristic also is not correct since segments may not be appended as well.
41 # Twitch vods of finished streams have EXT-X-PLAYLIST-TYPE:EVENT despite
42 # no segments will definitely be appended to the end of the playlist.
43 # r'#EXT-X-PLAYLIST-TYPE:EVENT', # media segments may be appended to the end of
44 # # event media playlists [4]
45
46 # 1. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.4
47 # 2. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.2
48 # 3. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.2
49 # 4. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.5
50 )
51 check_results = [not re.search(feature, manifest) for feature in UNSUPPORTED_FEATURES]
52 is_aes128_enc = '#EXT-X-KEY:METHOD=AES-128' in manifest
53 check_results.append(can_decrypt_frag or not is_aes128_enc)
54 check_results.append(not (is_aes128_enc and r'#EXT-X-BYTERANGE' in manifest))
55 check_results.append(not info_dict.get('is_live'))
56 return all(check_results)
57
58 def real_download(self, filename, info_dict):
59 man_url = info_dict['url']
60 self.to_screen('[%s] Downloading m3u8 manifest' % self.FD_NAME)
61
62 urlh = self.ydl.urlopen(self._prepare_url(info_dict, man_url))
63 man_url = urlh.geturl()
64 s = urlh.read().decode('utf-8', 'ignore')
65
66 if not self.can_download(s, info_dict):
67 if info_dict.get('extra_param_to_segment_url'):
68 self.report_error('pycrypto not found. Please install it.')
69 return False
70 self.report_warning(
71 'hlsnative has detected features it does not support, '
72 'extraction will be delegated to ffmpeg')
73 fd = FFmpegFD(self.ydl, self.params)
74 for ph in self._progress_hooks:
75 fd.add_progress_hook(ph)
76 return fd.real_download(filename, info_dict)
77
78 def anvato_ad(s):
79 return s.startswith('#ANVATO-SEGMENT-INFO') and 'type=ad' in s
80
81 media_frags = 0
82 ad_frags = 0
83 ad_frag_next = False
84 for line in s.splitlines():
85 line = line.strip()
86 if not line:
87 continue
88 if line.startswith('#'):
89 if anvato_ad(line):
90 ad_frags += 1
91 continue
92 if ad_frag_next:
93 ad_frag_next = False
94 continue
95 media_frags += 1
96
97 ctx = {
98 'filename': filename,
99 'total_frags': media_frags,
100 'ad_frags': ad_frags,
101 }
102
103 self._prepare_and_start_frag_download(ctx)
104
105 fragment_retries = self.params.get('fragment_retries', 0)
106 skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
107 test = self.params.get('test', False)
108
109 extra_query = None
110 extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url')
111 if extra_param_to_segment_url:
112 extra_query = compat_urlparse.parse_qs(extra_param_to_segment_url)
113 i = 0
114 media_sequence = 0
115 decrypt_info = {'METHOD': 'NONE'}
116 byte_range = {}
117 frag_index = 0
118 ad_frag_next = False
119 for line in s.splitlines():
120 line = line.strip()
121 if line:
122 if not line.startswith('#'):
123 if ad_frag_next:
124 ad_frag_next = False
125 continue
126 frag_index += 1
127 if frag_index <= ctx['fragment_index']:
128 continue
129 frag_url = (
130 line
131 if re.match(r'^https?://', line)
132 else compat_urlparse.urljoin(man_url, line))
133 if extra_query:
134 frag_url = update_url_query(frag_url, extra_query)
135 count = 0
136 headers = info_dict.get('http_headers', {})
137 if byte_range:
138 headers['Range'] = 'bytes=%d-%d' % (byte_range['start'], byte_range['end'])
139 while count <= fragment_retries:
140 try:
141 success, frag_content = self._download_fragment(
142 ctx, frag_url, info_dict, headers)
143 if not success:
144 return False
145 break
146 except compat_urllib_error.HTTPError as err:
147 # Unavailable (possibly temporary) fragments may be served.
148 # First we try to retry then either skip or abort.
149 # See https://github.com/rg3/youtube-dl/issues/10165,
150 # https://github.com/rg3/youtube-dl/issues/10448).
151 count += 1
152 if count <= fragment_retries:
153 self.report_retry_fragment(err, frag_index, count, fragment_retries)
154 if count > fragment_retries:
155 if skip_unavailable_fragments:
156 i += 1
157 media_sequence += 1
158 self.report_skip_fragment(frag_index)
159 continue
160 self.report_error(
161 'giving up after %s fragment retries' % fragment_retries)
162 return False
163 if decrypt_info['METHOD'] == 'AES-128':
164 iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', media_sequence)
165 decrypt_info['KEY'] = decrypt_info.get('KEY') or self.ydl.urlopen(decrypt_info['URI']).read()
166 frag_content = AES.new(
167 decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content)
168 self._append_fragment(ctx, frag_content)
169 # We only download the first fragment during the test
170 if test:
171 break
172 i += 1
173 media_sequence += 1
174 elif line.startswith('#EXT-X-KEY'):
175 decrypt_url = decrypt_info.get('URI')
176 decrypt_info = parse_m3u8_attributes(line[11:])
177 if decrypt_info['METHOD'] == 'AES-128':
178 if 'IV' in decrypt_info:
179 decrypt_info['IV'] = binascii.unhexlify(decrypt_info['IV'][2:].zfill(32))
180 if not re.match(r'^https?://', decrypt_info['URI']):
181 decrypt_info['URI'] = compat_urlparse.urljoin(
182 man_url, decrypt_info['URI'])
183 if extra_query:
184 decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_query)
185 if decrypt_url != decrypt_info['URI']:
186 decrypt_info['KEY'] = None
187 elif line.startswith('#EXT-X-MEDIA-SEQUENCE'):
188 media_sequence = int(line[22:])
189 elif line.startswith('#EXT-X-BYTERANGE'):
190 splitted_byte_range = line[17:].split('@')
191 sub_range_start = int(splitted_byte_range[1]) if len(splitted_byte_range) == 2 else byte_range['end']
192 byte_range = {
193 'start': sub_range_start,
194 'end': sub_range_start + int(splitted_byte_range[0]),
195 }
196 elif anvato_ad(line):
197 ad_frag_next = True
198
199 self._finish_frag_download(ctx)
200
201 return True