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from __future__ import unicode_literals
import reimport binasciitry: from Crypto.Cipher import AES can_decrypt_frag = Trueexcept ImportError: can_decrypt_frag = False
from .fragment import FragmentFDfrom .external import FFmpegFD
from ..compat import ( compat_urllib_error, compat_urlparse, compat_struct_pack,)from ..utils import ( 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, info_dict): 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] is_aes128_enc = '#EXT-X-KEY:METHOD=AES-128' in manifest check_results.append(can_decrypt_frag or not is_aes128_enc) check_results.append(not (is_aes128_enc and r'#EXT-X-BYTERANGE' in manifest)) check_results.append(not info_dict.get('is_live')) 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(self._prepare_url(info_dict, man_url)).read()
s = manifest.decode('utf-8', 'ignore')
if not self.can_download(s, info_dict): if info_dict.get('extra_param_to_segment_url'): self.report_error('pycrypto not found. Please install it.') return False 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'} byte_range = {} frag_index = 0 for line in s.splitlines(): line = line.strip() if line: if not line.startswith('#'): frag_index += 1 if frag_index <= ctx['fragment_index']: continue frag_url = ( line if re.match(r'^https?://', line) else compat_urlparse.urljoin(man_url, line)) if extra_query: frag_url = update_url_query(frag_url, extra_query) count = 0 headers = info_dict.get('http_headers', {}) if byte_range: headers['Range'] = 'bytes=%d-%d' % (byte_range['start'], byte_range['end']) while count <= fragment_retries: try: success, frag_content = self._download_fragment( ctx, frag_url, info_dict, headers) if not success: return False 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_index, count, fragment_retries) if count > fragment_retries: if skip_unavailable_fragments: i += 1 media_sequence += 1 self.report_skip_fragment(frag_index) 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) decrypt_info['KEY'] = decrypt_info.get('KEY') or self.ydl.urlopen(decrypt_info['URI']).read() frag_content = AES.new( decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content) self._append_fragment(ctx, frag_content) # We only download the first fragment during the test if test: break i += 1 media_sequence += 1 elif line.startswith('#EXT-X-KEY'): decrypt_url = decrypt_info.get('URI') 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) if decrypt_url != decrypt_info['URI']: decrypt_info['KEY'] = None elif line.startswith('#EXT-X-MEDIA-SEQUENCE'): media_sequence = int(line[22:]) elif line.startswith('#EXT-X-BYTERANGE'): splitted_byte_range = line[17:].split('@') sub_range_start = int(splitted_byte_range[1]) if len(splitted_byte_range) == 2 else byte_range['end'] byte_range = { 'start': sub_range_start, 'end': sub_range_start + int(splitted_byte_range[0]), }
self._finish_frag_download(ctx)
return True
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