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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') or info_dict.get('_decryption_key_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 is_ad_fragment_start(s):
79 return (s.startswith('#ANVATO-SEGMENT-INFO') and 'type=ad' in s
80 or s.startswith('#UPLYNK-SEGMENT') and s.endswith(',ad'))
81
82 def is_ad_fragment_end(s):
83 return (s.startswith('#ANVATO-SEGMENT-INFO') and 'type=master' in s
84 or s.startswith('#UPLYNK-SEGMENT') and s.endswith(',segment'))
85
86 media_frags = 0
87 ad_frags = 0
88 ad_frag_next = False
89 for line in s.splitlines():
90 line = line.strip()
91 if not line:
92 continue
93 if line.startswith('#'):
94 if is_ad_fragment_start(line):
95 ad_frag_next = True
96 elif is_ad_fragment_end(line):
97 ad_frag_next = False
98 continue
99 if ad_frag_next:
100 ad_frags += 1
101 continue
102 media_frags += 1
103
104 ctx = {
105 'filename': filename,
106 'total_frags': media_frags,
107 'ad_frags': ad_frags,
108 }
109
110 self._prepare_and_start_frag_download(ctx)
111
112 fragment_retries = self.params.get('fragment_retries', 0)
113 skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
114 test = self.params.get('test', False)
115
116 extra_query = None
117 extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url')
118 if extra_param_to_segment_url:
119 extra_query = compat_urlparse.parse_qs(extra_param_to_segment_url)
120 i = 0
121 media_sequence = 0
122 decrypt_info = {'METHOD': 'NONE'}
123 byte_range = {}
124 frag_index = 0
125 ad_frag_next = False
126 for line in s.splitlines():
127 line = line.strip()
128 if line:
129 if not line.startswith('#'):
130 if ad_frag_next:
131 continue
132 frag_index += 1
133 if frag_index <= ctx['fragment_index']:
134 continue
135 frag_url = (
136 line
137 if re.match(r'^https?://', line)
138 else compat_urlparse.urljoin(man_url, line))
139 if extra_query:
140 frag_url = update_url_query(frag_url, extra_query)
141 count = 0
142 headers = info_dict.get('http_headers', {})
143 if byte_range:
144 headers['Range'] = 'bytes=%d-%d' % (byte_range['start'], byte_range['end'])
145 while count <= fragment_retries:
146 try:
147 success, frag_content = self._download_fragment(
148 ctx, frag_url, info_dict, headers)
149 if not success:
150 return False
151 break
152 except compat_urllib_error.HTTPError as err:
153 # Unavailable (possibly temporary) fragments may be served.
154 # First we try to retry then either skip or abort.
155 # See https://github.com/ytdl-org/youtube-dl/issues/10165,
156 # https://github.com/ytdl-org/youtube-dl/issues/10448).
157 count += 1
158 if count <= fragment_retries:
159 self.report_retry_fragment(err, frag_index, count, fragment_retries)
160 if count > fragment_retries:
161 if skip_unavailable_fragments:
162 i += 1
163 media_sequence += 1
164 self.report_skip_fragment(frag_index)
165 continue
166 self.report_error(
167 'giving up after %s fragment retries' % fragment_retries)
168 return False
169 if decrypt_info['METHOD'] == 'AES-128':
170 iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', media_sequence)
171 decrypt_info['KEY'] = decrypt_info.get('KEY') or self.ydl.urlopen(
172 self._prepare_url(info_dict, info_dict.get('_decryption_key_url') or decrypt_info['URI'])).read()
173 frag_content = AES.new(
174 decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content)
175 self._append_fragment(ctx, frag_content)
176 # We only download the first fragment during the test
177 if test:
178 break
179 i += 1
180 media_sequence += 1
181 elif line.startswith('#EXT-X-KEY'):
182 decrypt_url = decrypt_info.get('URI')
183 decrypt_info = parse_m3u8_attributes(line[11:])
184 if decrypt_info['METHOD'] == 'AES-128':
185 if 'IV' in decrypt_info:
186 decrypt_info['IV'] = binascii.unhexlify(decrypt_info['IV'][2:].zfill(32))
187 if not re.match(r'^https?://', decrypt_info['URI']):
188 decrypt_info['URI'] = compat_urlparse.urljoin(
189 man_url, decrypt_info['URI'])
190 if extra_query:
191 decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_query)
192 if decrypt_url != decrypt_info['URI']:
193 decrypt_info['KEY'] = None
194 elif line.startswith('#EXT-X-MEDIA-SEQUENCE'):
195 media_sequence = int(line[22:])
196 elif line.startswith('#EXT-X-BYTERANGE'):
197 splitted_byte_range = line[17:].split('@')
198 sub_range_start = int(splitted_byte_range[1]) if len(splitted_byte_range) == 2 else byte_range['end']
199 byte_range = {
200 'start': sub_range_start,
201 'end': sub_range_start + int(splitted_byte_range[0]),
202 }
203 elif is_ad_fragment_start(line):
204 ad_frag_next = True
205 elif is_ad_fragment_end(line):
206 ad_frag_next = False
207
208 self._finish_frag_download(ctx)
209
210 return True