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

   1 from __future__ import unicode_literals
   2
   3 import re
   4
   5 from .common import FileDownloader
   6 from ..compat import compat_urllib_request
   7
   8
   9 class DashSegmentsFD(FileDownloader):
  10     """
  11     Download segments in a DASH manifest
  12     """
  13     def real_download(self, filename, info_dict):
  14         self.report_destination(filename)
  15         tmpfilename = self.temp_name(filename)
  16         base_url = info_dict['url']
  17         segment_urls = info_dict['segment_urls']
  18
  19         is_test = self.params.get('test', False)
  20         remaining_bytes = self._TEST_FILE_SIZE if is_test else None
  21         byte_counter = 0
  22
  23         def append_url_to_file(outf, target_url, target_name, remaining_bytes=None):
  24             self.to_screen('[DashSegments] %s: Downloading %s' % (info_dict['id'], target_name))
  25             req = compat_urllib_request.Request(target_url)
  26             if remaining_bytes is not None:
  27                 req.add_header('Range', 'bytes=0-%d' % (remaining_bytes - 1))
  28
  29             data = self.ydl.urlopen(req).read()
  30
  31             if remaining_bytes is not None:
  32                 data = data[:remaining_bytes]
  33
  34             outf.write(data)
  35             return len(data)
  36
  37         def combine_url(base_url, target_url):
  38             if re.match(r'^https?://', target_url):
  39                 return target_url
  40             return '%s%s%s' % (base_url, '' if base_url.endswith('/') else '/', target_url)
  41
  42         with open(tmpfilename, 'wb') as outf:
  43             append_url_to_file(
  44                 outf, combine_url(base_url, info_dict['initialization_url']),
  45                 'initialization segment')
  46             for i, segment_url in enumerate(segment_urls):
  47                 segment_len = append_url_to_file(
  48                     outf, combine_url(base_url, segment_url),
  49                     'segment %d / %d' % (i + 1, len(segment_urls)),
  50                     remaining_bytes)
  51                 byte_counter += segment_len
  52                 if remaining_bytes is not None:
  53                     remaining_bytes -= segment_len
  54                     if remaining_bytes <= 0:
  55                         break
  56
  57         self.try_rename(tmpfilename, filename)
  58
  59         self._hook_progress({
  60             'downloaded_bytes': byte_counter,
  61             'total_bytes': byte_counter,
  62             'filename': filename,
  63             'status': 'finished',
  64         })
  65
  66         return True