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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 manifest = self.ydl.urlopen(self._prepare_url(info_dict, man_url)).read()
63
64 s = manifest.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 total_frags = 0
79 for line in s.splitlines():
80 line = line.strip()
81 if line and not line.startswith('#'):
82 total_frags += 1
83
84 ctx = {
85 'filename': filename,
86 'total_frags': total_frags,
87 }
88
89 self._prepare_and_start_frag_download(ctx)
90
91 fragment_retries = self.params.get('fragment_retries', 0)
92 skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
93 test = self.params.get('test', False)
94
95 extra_query = None
96 extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url')
97 if extra_param_to_segment_url:
98 extra_query = compat_urlparse.parse_qs(extra_param_to_segment_url)
99 i = 0
100 media_sequence = 0
101 decrypt_info = {'METHOD': 'NONE'}
102 byte_range = {}
103 frag_index = 0
104 for line in s.splitlines():
105 line = line.strip()
106 if line:
107 if not line.startswith('#'):
108 frag_index += 1
109 if frag_index <= ctx['fragment_index']:
110 continue
111 frag_url = (
112 line
113 if re.match(r'^https?://', line)
114 else compat_urlparse.urljoin(man_url, line))
115 if extra_query:
116 frag_url = update_url_query(frag_url, extra_query)
117 count = 0
118 headers = info_dict.get('http_headers', {})
119 if byte_range:
120 headers['Range'] = 'bytes=%d-%d' % (byte_range['start'], byte_range['end'])
121 while count <= fragment_retries:
122 try:
123 success, frag_content = self._download_fragment(
124 ctx, frag_url, info_dict, headers)
125 if not success:
126 return False
127 break
128 except compat_urllib_error.HTTPError as err:
129 # Unavailable (possibly temporary) fragments may be served.
130 # First we try to retry then either skip or abort.
131 # See https://github.com/rg3/youtube-dl/issues/10165,
132 # https://github.com/rg3/youtube-dl/issues/10448).
133 count += 1
134 if count <= fragment_retries:
135 self.report_retry_fragment(err, frag_index, count, fragment_retries)
136 if count > fragment_retries:
137 if skip_unavailable_fragments:
138 i += 1
139 media_sequence += 1
140 self.report_skip_fragment(frag_index)
141 continue
142 self.report_error(
143 'giving up after %s fragment retries' % fragment_retries)
144 return False
145 if decrypt_info['METHOD'] == 'AES-128':
146 iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', media_sequence)
147 decrypt_info['KEY'] = decrypt_info.get('KEY') or self.ydl.urlopen(decrypt_info['URI']).read()
148 frag_content = AES.new(
149 decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content)
150 self._append_fragment(ctx, frag_content)
151 # We only download the first fragment during the test
152 if test:
153 break
154 i += 1
155 media_sequence += 1
156 elif line.startswith('#EXT-X-KEY'):
157 decrypt_url = decrypt_info.get('URI')
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 if decrypt_url != decrypt_info['URI']:
168 decrypt_info['KEY'] = None
169 elif line.startswith('#EXT-X-MEDIA-SEQUENCE'):
170 media_sequence = int(line[22:])
171 elif line.startswith('#EXT-X-BYTERANGE'):
172 splitted_byte_range = line[17:].split('@')
173 sub_range_start = int(splitted_byte_range[1]) if len(splitted_byte_range) == 2 else byte_range['end']
174 byte_range = {
175 'start': sub_range_start,
176 'end': sub_range_start + int(splitted_byte_range[0]),
177 }
178
179 self._finish_frag_download(ctx)
180
181 return True