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204 lines
9.0 KiB
204 lines
9.0 KiB
from __future__ import unicode_literals |
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import re |
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import binascii |
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try: |
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from Crypto.Cipher import AES |
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can_decrypt_frag = True |
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except ImportError: |
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can_decrypt_frag = False |
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from .fragment import FragmentFD |
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from .external import FFmpegFD |
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from ..compat import ( |
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compat_urllib_error, |
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compat_urlparse, |
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compat_struct_pack, |
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) |
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from ..utils import ( |
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parse_m3u8_attributes, |
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update_url_query, |
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) |
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class HlsFD(FragmentFD): |
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""" A limited implementation that does not require ffmpeg """ |
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FD_NAME = 'hlsnative' |
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@staticmethod |
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def can_download(manifest, info_dict): |
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UNSUPPORTED_FEATURES = ( |
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r'#EXT-X-KEY:METHOD=(?!NONE|AES-128)', # encrypted streams [1] |
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# r'#EXT-X-BYTERANGE', # playlists composed of byte ranges of media files [2] |
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# Live streams heuristic does not always work (e.g. geo restricted to Germany |
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# 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) |
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# r'#EXT-X-MEDIA-SEQUENCE:(?!0$)', # live streams [3] |
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# This heuristic also is not correct since segments may not be appended as well. |
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# Twitch vods of finished streams have EXT-X-PLAYLIST-TYPE:EVENT despite |
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# no segments will definitely be appended to the end of the playlist. |
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# r'#EXT-X-PLAYLIST-TYPE:EVENT', # media segments may be appended to the end of |
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# # event media playlists [4] |
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# 1. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.4 |
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# 2. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.2.2 |
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# 3. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.2 |
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# 4. https://tools.ietf.org/html/draft-pantos-http-live-streaming-17#section-4.3.3.5 |
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) |
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check_results = [not re.search(feature, manifest) for feature in UNSUPPORTED_FEATURES] |
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is_aes128_enc = '#EXT-X-KEY:METHOD=AES-128' in manifest |
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check_results.append(can_decrypt_frag or not is_aes128_enc) |
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check_results.append(not (is_aes128_enc and r'#EXT-X-BYTERANGE' in manifest)) |
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check_results.append(not info_dict.get('is_live')) |
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return all(check_results) |
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def real_download(self, filename, info_dict): |
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man_url = info_dict['url'] |
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self.to_screen('[%s] Downloading m3u8 manifest' % self.FD_NAME) |
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urlh = self.ydl.urlopen(self._prepare_url(info_dict, man_url)) |
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man_url = urlh.geturl() |
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s = urlh.read().decode('utf-8', 'ignore') |
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if not self.can_download(s, info_dict): |
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if info_dict.get('extra_param_to_segment_url'): |
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self.report_error('pycrypto not found. Please install it.') |
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return False |
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self.report_warning( |
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'hlsnative has detected features it does not support, ' |
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'extraction will be delegated to ffmpeg') |
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fd = FFmpegFD(self.ydl, self.params) |
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for ph in self._progress_hooks: |
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fd.add_progress_hook(ph) |
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return fd.real_download(filename, info_dict) |
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def is_ad_fragment(s): |
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return (s.startswith('#ANVATO-SEGMENT-INFO') and 'type=ad' in s or |
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s.startswith('#UPLYNK-SEGMENT') and s.endswith(',ad')) |
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media_frags = 0 |
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ad_frags = 0 |
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ad_frag_next = False |
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for line in s.splitlines(): |
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line = line.strip() |
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if not line: |
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continue |
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if line.startswith('#'): |
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if is_ad_fragment(line): |
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ad_frags += 1 |
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ad_frag_next = True |
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continue |
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if ad_frag_next: |
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ad_frag_next = False |
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continue |
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media_frags += 1 |
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ctx = { |
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'filename': filename, |
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'total_frags': media_frags, |
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'ad_frags': ad_frags, |
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} |
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self._prepare_and_start_frag_download(ctx) |
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fragment_retries = self.params.get('fragment_retries', 0) |
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skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True) |
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test = self.params.get('test', False) |
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extra_query = None |
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extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url') |
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if extra_param_to_segment_url: |
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extra_query = compat_urlparse.parse_qs(extra_param_to_segment_url) |
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i = 0 |
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media_sequence = 0 |
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decrypt_info = {'METHOD': 'NONE'} |
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byte_range = {} |
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frag_index = 0 |
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ad_frag_next = False |
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for line in s.splitlines(): |
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line = line.strip() |
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if line: |
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if not line.startswith('#'): |
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if ad_frag_next: |
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ad_frag_next = False |
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continue |
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frag_index += 1 |
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if frag_index <= ctx['fragment_index']: |
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continue |
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frag_url = ( |
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line |
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if re.match(r'^https?://', line) |
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else compat_urlparse.urljoin(man_url, line)) |
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if extra_query: |
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frag_url = update_url_query(frag_url, extra_query) |
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count = 0 |
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headers = info_dict.get('http_headers', {}) |
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if byte_range: |
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headers['Range'] = 'bytes=%d-%d' % (byte_range['start'], byte_range['end']) |
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while count <= fragment_retries: |
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try: |
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success, frag_content = self._download_fragment( |
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ctx, frag_url, info_dict, headers) |
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if not success: |
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return False |
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break |
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except compat_urllib_error.HTTPError as err: |
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# Unavailable (possibly temporary) fragments may be served. |
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# First we try to retry then either skip or abort. |
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# See https://github.com/rg3/youtube-dl/issues/10165, |
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# https://github.com/rg3/youtube-dl/issues/10448). |
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count += 1 |
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if count <= fragment_retries: |
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self.report_retry_fragment(err, frag_index, count, fragment_retries) |
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if count > fragment_retries: |
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if skip_unavailable_fragments: |
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i += 1 |
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media_sequence += 1 |
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self.report_skip_fragment(frag_index) |
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continue |
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self.report_error( |
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'giving up after %s fragment retries' % fragment_retries) |
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return False |
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if decrypt_info['METHOD'] == 'AES-128': |
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iv = decrypt_info.get('IV') or compat_struct_pack('>8xq', media_sequence) |
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decrypt_info['KEY'] = decrypt_info.get('KEY') or self.ydl.urlopen( |
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self._prepare_url(info_dict, decrypt_info['URI'])).read() |
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frag_content = AES.new( |
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decrypt_info['KEY'], AES.MODE_CBC, iv).decrypt(frag_content) |
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self._append_fragment(ctx, frag_content) |
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# We only download the first fragment during the test |
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if test: |
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break |
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i += 1 |
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media_sequence += 1 |
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elif line.startswith('#EXT-X-KEY'): |
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decrypt_url = decrypt_info.get('URI') |
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decrypt_info = parse_m3u8_attributes(line[11:]) |
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if decrypt_info['METHOD'] == 'AES-128': |
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if 'IV' in decrypt_info: |
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decrypt_info['IV'] = binascii.unhexlify(decrypt_info['IV'][2:].zfill(32)) |
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if not re.match(r'^https?://', decrypt_info['URI']): |
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decrypt_info['URI'] = compat_urlparse.urljoin( |
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man_url, decrypt_info['URI']) |
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if extra_query: |
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decrypt_info['URI'] = update_url_query(decrypt_info['URI'], extra_query) |
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if decrypt_url != decrypt_info['URI']: |
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decrypt_info['KEY'] = None |
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elif line.startswith('#EXT-X-MEDIA-SEQUENCE'): |
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media_sequence = int(line[22:]) |
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elif line.startswith('#EXT-X-BYTERANGE'): |
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splitted_byte_range = line[17:].split('@') |
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sub_range_start = int(splitted_byte_range[1]) if len(splitted_byte_range) == 2 else byte_range['end'] |
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byte_range = { |
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'start': sub_range_start, |
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'end': sub_range_start + int(splitted_byte_range[0]), |
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} |
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elif is_ad_fragment(line): |
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ad_frag_next = True |
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self._finish_frag_download(ctx) |
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return True
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