from __future__ import unicode_literals 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_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) 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): 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) 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')) 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, } 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 ad_frag_next = False for line in s.splitlines(): line = line.strip() if line: if not line.startswith('#'): 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) 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/ytdl-org/youtube-dl/issues/10165, # https://github.com/ytdl-org/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( self._prepare_url(info_dict, 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]), } elif is_ad_fragment_start(line): ad_frag_next = True elif is_ad_fragment_end(line): ad_frag_next = False self._finish_frag_download(ctx) return True class WebVttHlsFD(FragmentFD): """ A downloader for HLS WebVTT subtitles. """ FD_NAME = 'hlswebvtt' @staticmethod def _parse_ts(ts): m = re.match('(?:(?:([0-9]+):)?([0-9]+):)?([0-9]+)(?:\.([0-9]+))?', ts) hrs, min, sec, msc = m.groups() return 90 * ( int(hrs or 0) * 3600000 + int(min or 0) * 60000 + int(sec or 0) * 1000 + int(msc or 0) ) @staticmethod def _format_ts(ts): ts = int(ts / 90) hrs = ts / 3600000 ts %= 3600000 min = ts / 60000 ts %= 60000 sec = ts / 1000 ts %= 1000 return '%02u:%02u:%02u.%03u' % (hrs, min, sec, ts) def real_download(self, filename, info_dict): url = info_dict['url'] self.to_screen('[%s] Downloading m3u8 manifest' % self.FD_NAME) data = self.ydl.urlopen(url).read() s = data.decode('utf-8', 'ignore') segment_urls = [] for line in s.splitlines(): line = line.strip() if line and not line.startswith('#'): segment_url = ( line if re.match(r'^https?://', line) else compat_urlparse.urljoin(url, line)) segment_urls.append(segment_url) ctx = { 'filename': filename, 'total_frags': len(segment_urls), } self._prepare_and_start_frag_download(ctx) cues = [] header = [] frags_filenames = [] for i, frag_url in enumerate(segment_urls): frag_name = 'Frag%d' % i frag_filename = '%s-%s' % (ctx['tmpfilename'], frag_name) success = ctx['dl'].download(frag_filename, {'url': frag_url}) if not success: return False down, frag_sanitized = sanitize_open(frag_filename, 'rb') lines = down.read().decode('utf-8', 'ignore').splitlines() down.close() frags_filenames.append(frag_sanitized) line_iter = iter(lines) line = next(line_iter) if not line.startswith('WEBVTT'): self.report_error('Not a valid WebVTT subtitles segment') if len(line) > 6 and not (line.startswith('WEBVTT ') or line.startswith('WEBVTT\t')): self.report_error('Not a valid WebVTT subtitles segment') try: # read header tsadj = 0 while True: line = next(line_iter) if line == '': break elif line.find('-->') != -1: break if line.startswith('X-TIMESTAMP-MAP='): m = re.search(r'LOCAL:([0-9:.]+)', line) locl_ts = self._parse_ts(m.group(1)) m = re.search(r'MPEGTS:([0-9]+)', line) mpeg_ts = int(m.group(1)) tsadj = mpeg_ts - locl_ts else: header.append(line) subtitle = None while True: while line == '': line = next(line_iter) cue = {} if line.find('-->') == -1: cue['id'] = line line = next(line_iter) if line == '': continue m = re.match(r'^([0-9:.]+\s*)-->\s*([0-9:.]+)(\s+.*)?', line) if m: ts_start = self._parse_ts(m.group(1)) ts_end = self._parse_ts(m.group(2)) cue['style'] = m.group(3) or '' else: continue ts_start += tsadj ts_end += tsadj cue['start_ts'] = self._format_ts(ts_start) cue['end_ts'] = self._format_ts(ts_end) line = next(line_iter) cue['text'] = '' try: while line != '': if line.find('-->') != -1: break cue['text'] += line + '\n' line = next(line_iter) finally: cues.append(cue) except StopIteration: pass cues.sort(key=lambda cue: cue['start_ts']) with ctx['dest_stream'] as outf: outf.write(b'WEBVTT\n') for item in header: outf.write(('%s\n' % item).encode('utf-8')) for cue in cues: outf.write(b'\n') if cue.get('id'): outf.write(('%s\n' % cue['id']).encode('utf-8')) outf.write( ('%s --> %s%s\n' % (cue['start_ts'], cue['end_ts'], cue['style'])) .encode('utf-8') ) outf.write(cue['text'].encode('utf-8')) self._finish_frag_download(ctx) for frag_file in frags_filenames: os.remove(encodeFilename(frag_file))