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_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) extra_param_to_segment_url = info_dict.get('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_filename = '%s-Frag%d' % (ctx['tmpfilename'], i) if extra_param_to_segment_url: frag_url = update_url_query(frag_url, extra_param_to_segment_url) 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() 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 self.params.get('test', False): 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:]) if not re.match(r'^https?://', decrypt_info['URI']): decrypt_info['URI'] = compat_urlparse.urljoin( man_url, decrypt_info['URI']) if extra_param_to_segment_url: decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_param_to_segment_url) 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