_ Git - youtube-dl/blob - youtube_dl/downloader/dash.py

   1 from __future__ import unicode_literals
   2
   3 import os
   4 import re
   5
   6 from .fragment import FragmentFD
   7 from ..compat import compat_urllib_error
   8 from ..utils import (
   9     sanitize_open,
  10     encodeFilename,
  11 )
  12
  13
  14 class DashSegmentsFD(FragmentFD):
  15     """
  16     Download segments in a DASH manifest
  17     """
  18
  19     FD_NAME = 'dashsegments'
  20
  21     def real_download(self, filename, info_dict):
  22         base_url = info_dict['url']
  23         segment_urls = [info_dict['segment_urls'][0]] if self.params.get('test', False) else info_dict['segment_urls']
  24         initialization_url = info_dict.get('initialization_url')
  25
  26         ctx = {
  27             'filename': filename,
  28             'total_frags': len(segment_urls) + (1 if initialization_url else 0),
  29         }
  30
  31         self._prepare_and_start_frag_download(ctx)
  32
  33         def combine_url(base_url, target_url):
  34             if re.match(r'^https?://', target_url):
  35                 return target_url
  36             return '%s%s%s' % (base_url, '' if base_url.endswith('/') else '/', target_url)
  37
  38         segments_filenames = []
  39
  40         fragment_retries = self.params.get('fragment_retries', 0)
  41         skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
  42
  43         def append_url_to_file(target_url, tmp_filename, segment_name):
  44             target_filename = '%s-%s' % (tmp_filename, segment_name)
  45             count = 0
  46             while count <= fragment_retries:
  47                 try:
  48                     success = ctx['dl'].download(target_filename, {'url': combine_url(base_url, target_url)})
  49                     if not success:
  50                         return False
  51                     down, target_sanitized = sanitize_open(target_filename, 'rb')
  52                     ctx['dest_stream'].write(down.read())
  53                     down.close()
  54                     segments_filenames.append(target_sanitized)
  55                     break
  56                 except compat_urllib_error.HTTPError:
  57                     # YouTube may often return 404 HTTP error for a fragment causing the
  58                     # whole download to fail. However if the same fragment is immediately
  59                     # retried with the same request data this usually succeeds (1-2 attemps
  60                     # is usually enough) thus allowing to download the whole file successfully.
  61                     # To be future-proof we will retry all fragments that fail with any
  62                     # HTTP error.
  63                     count += 1
  64                     if count <= fragment_retries:
  65                         self.report_retry_fragment(segment_name, count, fragment_retries)
  66             if count > fragment_retries:
  67                 if skip_unavailable_fragments:
  68                     self.report_skip_fragment(segment_name)
  69                     return
  70                 self.report_error('giving up after %s fragment retries' % fragment_retries)
  71                 return False
  72
  73         if initialization_url:
  74             append_url_to_file(initialization_url, ctx['tmpfilename'], 'Init')
  75         for i, segment_url in enumerate(segment_urls):
  76             append_url_to_file(segment_url, ctx['tmpfilename'], 'Seg%d' % i)
  77
  78         self._finish_frag_download(ctx)
  79
  80         for segment_file in segments_filenames:
  81             os.remove(encodeFilename(segment_file))
  82
  83         return True