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