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325 lines
14 KiB
Python
325 lines
14 KiB
Python
from __future__ import unicode_literals
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import re
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import io
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import binascii
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from ..downloader import _get_real_downloader
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from .fragment import FragmentFD, can_decrypt_frag
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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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)
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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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bug_reports_message,
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)
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from .. import webvtt
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class HlsFD(FragmentFD):
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"""
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Download segments in a m3u8 manifest. External downloaders can take over
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the fragment downloads by supporting the 'm3u8_frag_urls' protocol and
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re-defining 'supports_manifest' function
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"""
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FD_NAME = 'hlsnative'
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@staticmethod
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def can_download(manifest, info_dict, allow_unplayable_formats=False, with_crypto=can_decrypt_frag):
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UNSUPPORTED_FEATURES = [
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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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# r'#EXT-X-MAP:', # media initialization [5]
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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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# 5. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.5
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]
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if not allow_unplayable_formats:
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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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]
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def check_results():
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yield not info_dict.get('is_live')
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is_aes128_enc = '#EXT-X-KEY:METHOD=AES-128' in manifest
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yield with_crypto or not is_aes128_enc
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yield not (is_aes128_enc and r'#EXT-X-BYTERANGE' in manifest)
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for feature in UNSUPPORTED_FEATURES:
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yield not re.search(feature, 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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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, self.params.get('allow_unplayable_formats')):
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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('pycryptodome not found. Please install')
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return False
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if self.can_download(s, info_dict, with_crypto=True):
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self.report_warning('pycryptodome is needed to download this file natively')
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fd = FFmpegFD(self.ydl, self.params)
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self.report_warning(
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'%s detected unsupported features; extraction will be delegated to %s' % (self.FD_NAME, fd.get_basename()))
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# TODO: Make progress updates work without hooking twice
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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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is_webvtt = info_dict['ext'] == 'vtt'
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if is_webvtt:
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real_downloader = None # Packing the fragments is not currently supported for external downloader
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else:
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real_downloader = _get_real_downloader(info_dict, 'm3u8_frag_urls', self.params, None)
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if real_downloader and not real_downloader.supports_manifest(s):
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real_downloader = None
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if real_downloader:
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self.to_screen(
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'[%s] Fragment downloads will be delegated to %s' % (self.FD_NAME, real_downloader.get_basename()))
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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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fragments = []
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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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if real_downloader:
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self._prepare_external_frag_download(ctx)
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else:
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self._prepare_and_start_frag_download(ctx)
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extra_state = ctx.setdefault('extra_state', {})
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format_index = info_dict.get('format_index')
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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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discontinuity_count = 0
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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 format_index and discontinuity_count != format_index:
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continue
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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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fragments.append({
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'frag_index': frag_index,
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'url': frag_url,
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'decrypt_info': decrypt_info,
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'byte_range': byte_range,
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'media_sequence': media_sequence,
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})
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elif line.startswith('#EXT-X-MAP'):
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if format_index and discontinuity_count != format_index:
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continue
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if frag_index > 0:
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self.report_error(
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'Initialization fragment found after media fragments, unable to download')
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return False
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frag_index += 1
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map_info = parse_m3u8_attributes(line[11:])
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frag_url = (
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map_info.get('URI')
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if re.match(r'^https?://', map_info.get('URI'))
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else compat_urlparse.urljoin(man_url, map_info.get('URI')))
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if extra_query:
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frag_url = update_url_query(frag_url, extra_query)
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fragments.append({
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'frag_index': frag_index,
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'url': frag_url,
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'decrypt_info': decrypt_info,
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'byte_range': byte_range,
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'media_sequence': media_sequence
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})
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if map_info.get('BYTERANGE'):
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splitted_byte_range = map_info.get('BYTERANGE').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 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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elif line.startswith('#EXT-X-DISCONTINUITY'):
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discontinuity_count += 1
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i += 1
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media_sequence += 1
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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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fragments = [fragments[0] if fragments else None]
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if real_downloader:
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info_copy = info_dict.copy()
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info_copy['fragments'] = fragments
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fd = real_downloader(self.ydl, self.params)
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# TODO: Make progress updates work without hooking twice
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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_copy)
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if is_webvtt:
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def pack_fragment(frag_content, frag_index):
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output = io.StringIO()
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adjust = 0
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for block in webvtt.parse_fragment(frag_content):
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if isinstance(block, webvtt.CueBlock):
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block.start += adjust
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block.end += adjust
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dedup_window = extra_state.setdefault('webvtt_dedup_window', [])
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cue = block.as_json
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# skip the cue if an identical one appears
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# in the window of potential duplicates
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# and prune the window of unviable candidates
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i = 0
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skip = True
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while i < len(dedup_window):
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window_cue = dedup_window[i]
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if window_cue == cue:
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break
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if window_cue['end'] >= cue['start']:
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i += 1
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continue
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del dedup_window[i]
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else:
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skip = False
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if skip:
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continue
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# add the cue to the window
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dedup_window.append(cue)
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elif isinstance(block, webvtt.Magic):
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# take care of MPEG PES timestamp overflow
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if block.mpegts is None:
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block.mpegts = 0
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extra_state.setdefault('webvtt_mpegts_adjust', 0)
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block.mpegts += extra_state['webvtt_mpegts_adjust'] << 33
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if block.mpegts < extra_state.get('webvtt_mpegts_last', 0):
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extra_state['webvtt_mpegts_adjust'] += 1
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block.mpegts += 1 << 33
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extra_state['webvtt_mpegts_last'] = block.mpegts
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if frag_index == 1:
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extra_state['webvtt_mpegts'] = block.mpegts or 0
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extra_state['webvtt_local'] = block.local or 0
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# XXX: block.local = block.mpegts = None ?
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else:
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if block.mpegts is not None and block.local is not None:
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adjust = (
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(block.mpegts - extra_state.get('webvtt_mpegts', 0))
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- (block.local - extra_state.get('webvtt_local', 0))
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)
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continue
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elif isinstance(block, webvtt.HeaderBlock):
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if frag_index != 1:
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# XXX: this should probably be silent as well
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# or verify that all segments contain the same data
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self.report_warning(bug_reports_message(
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'Discarding a %s block found in the middle of the stream; '
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'if the subtitles display incorrectly,'
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% (type(block).__name__)))
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continue
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block.write_into(output)
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return output.getvalue().encode('utf-8')
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else:
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pack_fragment = None
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return self.download_and_append_fragments(ctx, fragments, info_dict, pack_fragment)
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