diff options
Diffstat (limited to 'yt_dlp/downloader/hls.py')
| -rw-r--r-- | yt_dlp/downloader/hls.py | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/yt_dlp/downloader/hls.py b/yt_dlp/downloader/hls.py new file mode 100644 index 0000000..f2868dc --- /dev/null +++ b/yt_dlp/downloader/hls.py @@ -0,0 +1,365 @@ +import binascii +import io +import re +import urllib.parse + +from . import get_suitable_downloader +from .external import FFmpegFD +from .fragment import FragmentFD +from .. import webvtt +from ..dependencies import Cryptodome +from ..utils import ( + bug_reports_message, + parse_m3u8_attributes, + remove_start, + traverse_obj, + update_url_query, + urljoin, +) + + +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): + 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') + 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') + + can_download, message = self.can_download(s, info_dict, self.params.get('allow_unplayable_formats')), None + if can_download: + has_ffmpeg = FFmpegFD.available() + no_crypto = not Cryptodome.AES and '#EXT-X-KEY:METHOD=AES-128' in s + if no_crypto and has_ffmpeg: + can_download, message = False, 'The stream has AES-128 encryption and pycryptodomex is not available' + elif no_crypto: + message = ('The stream has AES-128 encryption and neither ffmpeg nor pycryptodomex are available; ' + 'Decryption will be performed natively, but will be extremely slow') + elif info_dict.get('extractor_key') == 'Generic' and re.search(r'(?m)#EXT-X-MEDIA-SEQUENCE:(?!0$)', s): + install_ffmpeg = '' if has_ffmpeg else 'install ffmpeg and ' + message = ('Live HLS streams are not supported by the native downloader. If this is a livestream, ' + f'please {install_ffmpeg}add "--downloader ffmpeg --hls-use-mpegts" to your command') + if not can_download: + has_drm = re.search('|'.join([ + r'#EXT-X-FAXS-CM:', # Adobe Flash Access + r'#EXT-X-(?:SESSION-)?KEY:.*?URI="skd://', # Apple FairPlay + ]), s) + if has_drm and not self.params.get('allow_unplayable_formats'): + self.report_error( + 'This video is DRM protected; Try selecting another format with --format or ' + 'add --check-formats to automatically fallback to the next best format') + return False + message = message or 'Unsupported features have been detected' + fd = FFmpegFD(self.ydl, self.params) + self.report_warning(f'{message}; extraction will be delegated to {fd.get_basename()}') + return fd.real_download(filename, info_dict) + elif message: + self.report_warning(message) + + 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_suitable_downloader( + info_dict, self.params, None, protocol='m3u8_frag_urls', to_stdout=(filename == '-')) + if real_downloader and not real_downloader.supports_manifest(s): + real_downloader = None + if real_downloader: + self.to_screen(f'[{self.FD_NAME}] Fragment downloads will be delegated to {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 = urllib.parse.parse_qs(extra_param_to_segment_url) + i = 0 + media_sequence = 0 + decrypt_info = {'METHOD': 'NONE'} + external_aes_key = traverse_obj(info_dict, ('hls_aes', 'key')) + if external_aes_key: + external_aes_key = binascii.unhexlify(remove_start(external_aes_key, '0x')) + assert len(external_aes_key) in (16, 24, 32), 'Invalid length for HLS AES-128 key' + external_aes_iv = traverse_obj(info_dict, ('hls_aes', 'iv')) + if external_aes_iv: + external_aes_iv = binascii.unhexlify(remove_start(external_aes_iv, '0x').zfill(32)) + 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 = 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, + }) + media_sequence += 1 + + 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 = urljoin(man_url, map_info.get('URI')) + if extra_query: + frag_url = update_url_query(frag_url, extra_query) + + 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]), + } + + fragments.append({ + 'frag_index': frag_index, + 'url': frag_url, + 'decrypt_info': decrypt_info, + 'byte_range': byte_range, + 'media_sequence': media_sequence + }) + 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 external_aes_iv: + decrypt_info['IV'] = external_aes_iv + elif 'IV' in decrypt_info: + decrypt_info['IV'] = binascii.unhexlify(decrypt_info['IV'][2:].zfill(32)) + if external_aes_key: + decrypt_info['KEY'] = external_aes_key + else: + decrypt_info['URI'] = 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 + + # 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_dict['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_dict) + + if is_webvtt: + def pack_fragment(frag_content, frag_index): + output = io.StringIO() + adjust = 0 + overflow = False + mpegts_last = None + for block in webvtt.parse_fragment(frag_content): + if isinstance(block, webvtt.CueBlock): + extra_state['webvtt_mpegts_last'] = mpegts_last + if overflow: + extra_state['webvtt_mpegts_adjust'] += 1 + overflow = False + block.start += adjust + block.end += adjust + + dedup_window = extra_state.setdefault('webvtt_dedup_window', []) + + ready = [] + + i = 0 + is_new = True + while i < len(dedup_window): + wcue = dedup_window[i] + wblock = webvtt.CueBlock.from_json(wcue) + i += 1 + if wblock.hinges(block): + wcue['end'] = block.end + is_new = False + continue + if wblock == block: + is_new = False + continue + if wblock.end > block.start: + continue + ready.append(wblock) + i -= 1 + del dedup_window[i] + + if is_new: + dedup_window.append(block.as_json) + for block in ready: + block.write_into(output) + + # we only emit cues once they fall out of the duplicate window + continue + 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): + overflow = True + block.mpegts += 1 << 33 + 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() + + def fin_fragments(): + dedup_window = extra_state.get('webvtt_dedup_window') + if not dedup_window: + return b'' + + output = io.StringIO() + for cue in dedup_window: + webvtt.CueBlock.from_json(cue).write_into(output) + + return output.getvalue().encode() + + self.download_and_append_fragments( + ctx, fragments, info_dict, pack_func=pack_fragment, finish_func=fin_fragments) + else: + return self.download_and_append_fragments(ctx, fragments, info_dict) |