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