mirror of
https://github.com/l1ving/youtube-dl
synced 2024-11-20 21:15:35 +08:00
6e65a2a67e
The end of the byte range is the first byte that is NOT part of the to be downloaded range. So don't include it into the requested HTTP download range, as this additional byte leads to a broken TS packet and subsequently to e.g. visible video corruption. Fixes #14748.
211 lines
9.4 KiB
Python
211 lines
9.4 KiB
Python
from __future__ import unicode_literals
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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_urllib_error,
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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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parse_m3u8_attributes,
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update_url_query,
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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, info_dict):
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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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is_aes128_enc = '#EXT-X-KEY:METHOD=AES-128' in manifest
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check_results.append(can_decrypt_frag or not is_aes128_enc)
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check_results.append(not (is_aes128_enc and r'#EXT-X-BYTERANGE' in manifest))
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check_results.append(not info_dict.get('is_live'))
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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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urlh = self.ydl.urlopen(self._prepare_url(info_dict, man_url))
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man_url = urlh.geturl()
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s = urlh.read().decode('utf-8', 'ignore')
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if not self.can_download(s, info_dict):
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if info_dict.get('extra_param_to_segment_url') or info_dict.get('_decryption_key_url'):
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self.report_error('pycrypto not found. Please install it.')
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return False
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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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def is_ad_fragment_start(s):
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return (s.startswith('#ANVATO-SEGMENT-INFO') and 'type=ad' in s
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or s.startswith('#UPLYNK-SEGMENT') and s.endswith(',ad'))
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def is_ad_fragment_end(s):
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return (s.startswith('#ANVATO-SEGMENT-INFO') and 'type=master' in s
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or s.startswith('#UPLYNK-SEGMENT') and s.endswith(',segment'))
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media_frags = 0
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ad_frags = 0
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ad_frag_next = False
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for line in s.splitlines():
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line = line.strip()
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if not line:
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continue
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if line.startswith('#'):
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if is_ad_fragment_start(line):
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ad_frag_next = True
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elif is_ad_fragment_end(line):
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ad_frag_next = False
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continue
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if ad_frag_next:
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ad_frags += 1
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continue
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media_frags += 1
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ctx = {
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'filename': filename,
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'total_frags': media_frags,
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'ad_frags': ad_frags,
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}
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self._prepare_and_start_frag_download(ctx)
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fragment_retries = self.params.get('fragment_retries', 0)
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skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
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test = self.params.get('test', False)
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extra_query = None
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extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url')
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if extra_param_to_segment_url:
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extra_query = compat_urlparse.parse_qs(extra_param_to_segment_url)
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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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byte_range = {}
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frag_index = 0
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ad_frag_next = False
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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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if ad_frag_next:
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continue
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frag_index += 1
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if frag_index <= ctx['fragment_index']:
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continue
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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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if extra_query:
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frag_url = update_url_query(frag_url, extra_query)
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count = 0
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headers = info_dict.get('http_headers', {})
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if byte_range:
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headers['Range'] = 'bytes=%d-%d' % (byte_range['start'], byte_range['end'] - 1)
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while count <= fragment_retries:
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try:
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success, frag_content = self._download_fragment(
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ctx, frag_url, info_dict, headers)
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if not success:
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return False
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break
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except compat_urllib_error.HTTPError as err:
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# Unavailable (possibly temporary) fragments may be served.
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# First we try to retry then either skip or abort.
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# See https://github.com/ytdl-org/youtube-dl/issues/10165,
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# https://github.com/ytdl-org/youtube-dl/issues/10448).
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count += 1
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if count <= fragment_retries:
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self.report_retry_fragment(err, frag_index, count, fragment_retries)
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if count > fragment_retries:
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if skip_unavailable_fragments:
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i += 1
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media_sequence += 1
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self.report_skip_fragment(frag_index)
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continue
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self.report_error(
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'giving up after %s fragment retries' % fragment_retries)
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return False
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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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decrypt_info['KEY'] = decrypt_info.get('KEY') or self.ydl.urlopen(
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self._prepare_url(info_dict, info_dict.get('_decryption_key_url') or decrypt_info['URI'])).read()
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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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self._append_fragment(ctx, frag_content)
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# We only download the first fragment during the test
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if test:
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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_url = decrypt_info.get('URI')
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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:].zfill(32))
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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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if extra_query:
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decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_query)
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if decrypt_url != decrypt_info['URI']:
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decrypt_info['KEY'] = None
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elif line.startswith('#EXT-X-MEDIA-SEQUENCE'):
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media_sequence = int(line[22:])
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elif line.startswith('#EXT-X-BYTERANGE'):
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splitted_byte_range = line[17:].split('@')
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sub_range_start = int(splitted_byte_range[1]) if len(splitted_byte_range) == 2 else byte_range['end']
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byte_range = {
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'start': sub_range_start,
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'end': sub_range_start + int(splitted_byte_range[0]),
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}
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elif is_ad_fragment_start(line):
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ad_frag_next = True
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elif is_ad_fragment_end(line):
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ad_frag_next = False
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self._finish_frag_download(ctx)
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return True
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