diff options
Diffstat (limited to 'youtube_dl/downloader/hls.py')
| -rw-r--r-- | youtube_dl/downloader/hls.py | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/youtube_dl/downloader/hls.py b/youtube_dl/downloader/hls.py new file mode 100644 index 0000000..fd30452 --- /dev/null +++ b/youtube_dl/downloader/hls.py @@ -0,0 +1,204 @@ +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(s): + return (s.startswith('#ANVATO-SEGMENT-INFO') and 'type=ad' in s or + s.startswith('#UPLYNK-SEGMENT') and s.endswith(',ad')) + + 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(line): + ad_frags += 1 + ad_frag_next = True + continue + if ad_frag_next: + ad_frag_next = False + 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: + ad_frag_next = False + 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/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( + 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(line): + ad_frag_next = True + + self._finish_frag_download(ctx) + + return True |