- from __future__ import unicode_literals
-
- import os.path
- import re
- import binascii
- try:
- from Crypto.Cipher import AES
- can_decrypt_frag = True
- except ImportError:
- can_decrypt_frag = False
-
- from .fragment import FragmentFD
- from .external import FFmpegFD
-
- from ..compat import (
- compat_urllib_error,
- compat_urlparse,
- compat_struct_pack,
- )
- from ..utils import (
- encodeFilename,
- sanitize_open,
- parse_m3u8_attributes,
- update_url_query,
- )
-
-
- class HlsFD(FragmentFD):
- """ A limited implementation that does not require ffmpeg """
-
- FD_NAME = 'hlsnative'
-
- @staticmethod
- def can_download(manifest):
- UNSUPPORTED_FEATURES = (
- r'#EXT-X-KEY:METHOD=(?!NONE|AES-128)', # encrypted streams [1]
- r'#EXT-X-BYTERANGE', # playlists composed of byte ranges of media files [2]
-
- # Live streams heuristic does not always work (e.g. geo restricted to Germany
- # 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)
- # r'#EXT-X-MEDIA-SEQUENCE:(?!0$)', # live streams [3]
-
- # This heuristic also is not correct since segments may not be appended as well.
- # Twitch vods of finished streams have EXT-X-PLAYLIST-TYPE:EVENT despite
- # no segments will definitely be appended to the end of the playlist.
- # r'#EXT-X-PLAYLIST-TYPE:EVENT', # media segments may be appended to the end of
- # # event media playlists [4]
-
- # 1. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.4
- # 2. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.2
- # 3. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.2
- # 4. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.5
- )
- check_results = [not re.search(feature, manifest) for feature in UNSUPPORTED_FEATURES]
- check_results.append(can_decrypt_frag or '#EXT-X-KEY:METHOD=AES-128' not in manifest)
- return all(check_results)
-
- def real_download(self, filename, info_dict):
- man_url = info_dict['url']
- self.to_screen('[%s] Downloading m3u8 manifest' % self.FD_NAME)
- manifest = self.ydl.urlopen(man_url).read()
-
- s = manifest.decode('utf-8', 'ignore')
-
- if not self.can_download(s):
- self.report_warning(
- 'hlsnative has detected features it does not support, '
- 'extraction will be delegated to ffmpeg')
- fd = FFmpegFD(self.ydl, self.params)
- for ph in self._progress_hooks:
- fd.add_progress_hook(ph)
- return fd.real_download(filename, info_dict)
-
- total_frags = 0
- for line in s.splitlines():
- line = line.strip()
- if line and not line.startswith('#'):
- total_frags += 1
-
- ctx = {
- 'filename': filename,
- 'total_frags': total_frags,
- }
-
- self._prepare_and_start_frag_download(ctx)
-
- fragment_retries = self.params.get('fragment_retries', 0)
- skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
- test = self.params.get('test', False)
-
- extra_query = None
- extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url')
- if extra_param_to_segment_url:
- extra_query = compat_urlparse.parse_qs(extra_param_to_segment_url)
- i = 0
- media_sequence = 0
- decrypt_info = {'METHOD': 'NONE'}
- frags_filenames = []
- for line in s.splitlines():
- line = line.strip()
- if line:
- if not line.startswith('#'):
- frag_url = (
- line
- if re.match(r'^https?://', line)
- else compat_urlparse.urljoin(man_url, line))
- frag_name = 'Frag%d' % i
- frag_filename = '%s-%s' % (ctx['tmpfilename'], frag_name)
- if extra_query:
- frag_url = update_url_query(frag_url, extra_query)
- count = 0
- while count <= fragment_retries:
- try:
- success = ctx['dl'].download(frag_filename, {'url': frag_url})
- if not success:
- return False
- down, frag_sanitized = sanitize_open(frag_filename, 'rb')
- frag_content = down.read()
- down.close()
- break
- except compat_urllib_error.HTTPError as err:
- # Unavailable (possibly temporary) fragments may be served.
- # First we try to retry then either skip or abort.
- # See https://github.com/rg3/youtube-dl/issues/10165,
- # https://github.com/rg3/youtube-dl/issues/10448).
- count += 1
- if count <= fragment_retries:
- self.report_retry_fragment(err, frag_name, count, fragment_retries)
- if count > fragment_retries:
- if skip_unavailable_fragments:
- i += 1
- media_sequence += 1
- self.report_skip_fragment(frag_name)
- continue
- self.report_error(
- 'giving up after %s fragment retries' % fragment_retries)
- return False
- if decrypt_info['METHOD'] == 'AES-128':
- iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', media_sequence)
- frag_content = AES.new(
- decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content)
- ctx['dest_stream'].write(frag_content)
- frags_filenames.append(frag_sanitized)
- # We only download the first fragment during the test
- if test:
- break
- i += 1
- media_sequence += 1
- elif line.startswith('#EXT-X-KEY'):
- decrypt_info = parse_m3u8_attributes(line[11:])
- if decrypt_info['METHOD'] == 'AES-128':
- if 'IV' in decrypt_info:
- decrypt_info['IV'] = binascii.unhexlify(decrypt_info['IV'][2:].zfill(32))
- if not re.match(r'^https?://', decrypt_info['URI']):
- decrypt_info['URI'] = compat_urlparse.urljoin(
- man_url, decrypt_info['URI'])
- if extra_query:
- decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_query)
- decrypt_info['KEY'] = self.ydl.urlopen(decrypt_info['URI']).read()
- elif line.startswith('#EXT-X-MEDIA-SEQUENCE'):
- media_sequence = int(line[22:])
-
- self._finish_frag_download(ctx)
-
- for frag_file in frags_filenames:
- os.remove(encodeFilename(frag_file))
-
- return True
|
