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