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

   1 from __future__ import division, unicode_literals
   2
   3 import os
   4 import time
   5
   6 from .common import FileDownloader
   7 from .http import HttpFD
   8 from ..utils import (
   9     encodeFilename,
  10     sanitize_open,
  11 )
  12
  13
  14 class HttpQuietDownloader(HttpFD):
  15     def to_screen(self, *args, **kargs):
  16         pass
  17
  18
  19 class FragmentFD(FileDownloader):
  20     """
  21     A base file downloader class for fragmented media (e.g. f4m/m3u8 manifests).
  22     """
  23
  24     def _prepare_and_start_frag_download(self, ctx):
  25         self._prepare_frag_download(ctx)
  26         self._start_frag_download(ctx)
  27
  28     def _prepare_frag_download(self, ctx):
  29         if 'live' not in ctx:
  30             ctx['live'] = False
  31         self.to_screen(
  32             '[%s] Total fragments: %s'
  33             % (self.FD_NAME, ctx['total_frags'] if not ctx['live'] else 'unknown (live)'))
  34         self.report_destination(ctx['filename'])
  35         dl = HttpQuietDownloader(
  36             self.ydl,
  37             {
  38                 'continuedl': True,
  39                 'quiet': True,
  40                 'noprogress': True,
  41                 'ratelimit': self.params.get('ratelimit'),
  42                 'retries': self.params.get('retries', 0),
  43                 'test': self.params.get('test', False),
  44             }
  45         )
  46         tmpfilename = self.temp_name(ctx['filename'])
  47         dest_stream, tmpfilename = sanitize_open(tmpfilename, 'wb')
  48         ctx.update({
  49             'dl': dl,
  50             'dest_stream': dest_stream,
  51             'tmpfilename': tmpfilename,
  52         })
  53
  54     def _start_frag_download(self, ctx):
  55         total_frags = ctx['total_frags']
  56         # This dict stores the download progress, it's updated by the progress
  57         # hook
  58         state = {
  59             'status': 'downloading',
  60             'downloaded_bytes': 0,
  61             'frag_index': 0,
  62             'frag_count': total_frags,
  63             'filename': ctx['filename'],
  64             'tmpfilename': ctx['tmpfilename'],
  65         }
  66
  67         start = time.time()
  68         ctx.update({
  69             'started': start,
  70             # Total complete fragments downloaded so far in bytes
  71             'complete_frags_downloaded_bytes': 0,
  72             # Amount of fragment's bytes downloaded by the time of the previous
  73             # frag progress hook invocation
  74             'prev_frag_downloaded_bytes': 0,
  75         })
  76
  77         def frag_progress_hook(s):
  78             if s['status'] not in ('downloading', 'finished'):
  79                 return
  80
  81             time_now = time.time()
  82             state['elapsed'] = time_now - start
  83             frag_total_bytes = s.get('total_bytes') or 0
  84             if not ctx['live']:
  85                 estimated_size = (
  86                     (ctx['complete_frags_downloaded_bytes'] + frag_total_bytes) /
  87                     (state['frag_index'] + 1) * total_frags)
  88                 state['total_bytes_estimate'] = estimated_size
  89
  90             if s['status'] == 'finished':
  91                 state['frag_index'] += 1
  92                 state['downloaded_bytes'] += frag_total_bytes - ctx['prev_frag_downloaded_bytes']
  93                 ctx['complete_frags_downloaded_bytes'] = state['downloaded_bytes']
  94                 ctx['prev_frag_downloaded_bytes'] = 0
  95             else:
  96                 frag_downloaded_bytes = s['downloaded_bytes']
  97                 state['downloaded_bytes'] += frag_downloaded_bytes - ctx['prev_frag_downloaded_bytes']
  98                 if not ctx['live']:
  99                     state['eta'] = self.calc_eta(
 100                         start, time_now, estimated_size,
 101                         state['downloaded_bytes'])
 102                 state['speed'] = s.get('speed')
 103                 ctx['prev_frag_downloaded_bytes'] = frag_downloaded_bytes
 104             self._hook_progress(state)
 105
 106         ctx['dl'].add_progress_hook(frag_progress_hook)
 107
 108         return start
 109
 110     def _finish_frag_download(self, ctx):
 111         ctx['dest_stream'].close()
 112         elapsed = time.time() - ctx['started']
 113         self.try_rename(ctx['tmpfilename'], ctx['filename'])
 114         fsize = os.path.getsize(encodeFilename(ctx['filename']))
 115
 116         self._hook_progress({
 117             'downloaded_bytes': fsize,
 118             'total_bytes': fsize,
 119             'filename': ctx['filename'],
 120             'status': 'finished',
 121             'elapsed': elapsed,
 122         })