hls.py (10181B)
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 r'#EXT-X-MAP:', # media initialization [5] 46 47 # 1. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.4 48 # 2. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.2 49 # 3. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.2 50 # 4. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.5 51 # 5. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.5 52 ) 53 check_results = [not re.search(feature, manifest) for feature in UNSUPPORTED_FEATURES] 54 is_aes128_enc = '#EXT-X-KEY:METHOD=AES-128' in manifest 55 check_results.append(can_decrypt_frag or not is_aes128_enc) 56 check_results.append(not (is_aes128_enc and r'#EXT-X-BYTERANGE' in manifest)) 57 check_results.append(not info_dict.get('is_live')) 58 return all(check_results) 59 60 def real_download(self, filename, info_dict): 61 man_url = info_dict['url'] 62 self.to_screen('[%s] Downloading m3u8 manifest' % self.FD_NAME) 63 64 urlh = self.ydl.urlopen(self._prepare_url(info_dict, man_url)) 65 man_url = urlh.geturl() 66 s = urlh.read().decode('utf-8', 'ignore') 67 68 if not self.can_download(s, info_dict): 69 if info_dict.get('extra_param_to_segment_url') or info_dict.get('_decryption_key_url'): 70 self.report_error('pycrypto not found. Please install it.') 71 return False 72 self.report_warning( 73 'hlsnative has detected features it does not support, ' 74 'extraction will be delegated to ffmpeg') 75 fd = FFmpegFD(self.ydl, self.params) 76 for ph in self._progress_hooks: 77 fd.add_progress_hook(ph) 78 return fd.real_download(filename, info_dict) 79 80 def is_ad_fragment_start(s): 81 return (s.startswith('#ANVATO-SEGMENT-INFO') and 'type=ad' in s 82 or s.startswith('#UPLYNK-SEGMENT') and s.endswith(',ad')) 83 84 def is_ad_fragment_end(s): 85 return (s.startswith('#ANVATO-SEGMENT-INFO') and 'type=master' in s 86 or s.startswith('#UPLYNK-SEGMENT') and s.endswith(',segment')) 87 88 media_frags = 0 89 ad_frags = 0 90 ad_frag_next = False 91 for line in s.splitlines(): 92 line = line.strip() 93 if not line: 94 continue 95 if line.startswith('#'): 96 if is_ad_fragment_start(line): 97 ad_frag_next = True 98 elif is_ad_fragment_end(line): 99 ad_frag_next = False 100 continue 101 if ad_frag_next: 102 ad_frags += 1 103 continue 104 media_frags += 1 105 106 ctx = { 107 'filename': filename, 108 'total_frags': media_frags, 109 'ad_frags': ad_frags, 110 } 111 112 self._prepare_and_start_frag_download(ctx) 113 114 fragment_retries = self.params.get('fragment_retries', 0) 115 skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True) 116 test = self.params.get('test', False) 117 118 extra_query = None 119 extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url') 120 if extra_param_to_segment_url: 121 extra_query = compat_urlparse.parse_qs(extra_param_to_segment_url) 122 i = 0 123 media_sequence = 0 124 decrypt_info = {'METHOD': 'NONE'} 125 byte_range = {} 126 frag_index = 0 127 ad_frag_next = False 128 for line in s.splitlines(): 129 line = line.strip() 130 if line: 131 if not line.startswith('#'): 132 if ad_frag_next: 133 continue 134 frag_index += 1 135 if frag_index <= ctx['fragment_index']: 136 continue 137 frag_url = ( 138 line 139 if re.match(r'^https?://', line) 140 else compat_urlparse.urljoin(man_url, line)) 141 if extra_query: 142 frag_url = update_url_query(frag_url, extra_query) 143 count = 0 144 headers = info_dict.get('http_headers', {}) 145 if byte_range: 146 headers['Range'] = 'bytes=%d-%d' % (byte_range['start'], byte_range['end'] - 1) 147 while count <= fragment_retries: 148 try: 149 success, frag_content = self._download_fragment( 150 ctx, frag_url, info_dict, headers) 151 if not success: 152 return False 153 break 154 except compat_urllib_error.HTTPError as err: 155 # Unavailable (possibly temporary) fragments may be served. 156 # First we try to retry then either skip or abort. 157 # See https://github.com/ytdl-org/youtube-dl/issues/10165, 158 # https://github.com/ytdl-org/youtube-dl/issues/10448). 159 count += 1 160 if count <= fragment_retries: 161 self.report_retry_fragment(err, frag_index, count, fragment_retries) 162 if count > fragment_retries: 163 if skip_unavailable_fragments: 164 i += 1 165 media_sequence += 1 166 self.report_skip_fragment(frag_index) 167 continue 168 self.report_error( 169 'giving up after %s fragment retries' % fragment_retries) 170 return False 171 if decrypt_info['METHOD'] == 'AES-128': 172 iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', media_sequence) 173 decrypt_info['KEY'] = decrypt_info.get('KEY') or self.ydl.urlopen( 174 self._prepare_url(info_dict, info_dict.get('_decryption_key_url') or decrypt_info['URI'])).read() 175 # Don't decrypt the content in tests since the data is explicitly truncated and it's not to a valid block 176 # size (see https://github.com/ytdl-org/youtube-dl/pull/27660). Tests only care that the correct data downloaded, 177 # not what it decrypts to. 178 if not test: 179 frag_content = AES.new( 180 decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content) 181 self._append_fragment(ctx, frag_content) 182 # We only download the first fragment during the test 183 if test: 184 break 185 i += 1 186 media_sequence += 1 187 elif line.startswith('#EXT-X-KEY'): 188 decrypt_url = decrypt_info.get('URI') 189 decrypt_info = parse_m3u8_attributes(line[11:]) 190 if decrypt_info['METHOD'] == 'AES-128': 191 if 'IV' in decrypt_info: 192 decrypt_info['IV'] = binascii.unhexlify(decrypt_info['IV'][2:].zfill(32)) 193 if not re.match(r'^https?://', decrypt_info['URI']): 194 decrypt_info['URI'] = compat_urlparse.urljoin( 195 man_url, decrypt_info['URI']) 196 if extra_query: 197 decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_query) 198 if decrypt_url != decrypt_info['URI']: 199 decrypt_info['KEY'] = None 200 elif line.startswith('#EXT-X-MEDIA-SEQUENCE'): 201 media_sequence = int(line[22:]) 202 elif line.startswith('#EXT-X-BYTERANGE'): 203 splitted_byte_range = line[17:].split('@') 204 sub_range_start = int(splitted_byte_range[1]) if len(splitted_byte_range) == 2 else byte_range['end'] 205 byte_range = { 206 'start': sub_range_start, 207 'end': sub_range_start + int(splitted_byte_range[0]), 208 } 209 elif is_ad_fragment_start(line): 210 ad_frag_next = True 211 elif is_ad_fragment_end(line): 212 ad_frag_next = False 213 214 self._finish_frag_download(ctx) 215 216 return True