_ 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     error_to_compat_str,
  10     encodeFilename,
  11     sanitize_open,
  12 )
  13
  14
  15 class HttpQuietDownloader(HttpFD):
  16     def to_screen(self, *args, **kargs):
  17         pass
  18
  19
  20 class FragmentFD(FileDownloader):
  21     """
  22     A base file downloader class for fragmented media (e.g. f4m/m3u8 manifests).
  23
  24     Available options:
  25
  26     fragment_retries:   Number of times to retry a fragment for HTTP error (DASH
  27                         and hlsnative only)
  28     skip_unavailable_fragments:
  29                         Skip unavailable fragments (DASH and hlsnative only)
  30     """
  31
  32     def report_retry_fragment(self, err, fragment_name, count, retries):
  33         self.to_screen(
  34             '[download] Got server HTTP error: %s. Retrying fragment %s (attempt %d of %s)...'
  35             % (error_to_compat_str(err), fragment_name, count, self.format_retries(retries)))
  36
  37     def report_skip_fragment(self, fragment_name):
  38         self.to_screen('[download] Skipping fragment %s...' % fragment_name)
  39
  40     def _prepare_and_start_frag_download(self, ctx):
  41         self._prepare_frag_download(ctx)
  42         self._start_frag_download(ctx)
  43
  44     def _prepare_frag_download(self, ctx):
  45         if 'live' not in ctx:
  46             ctx['live'] = False
  47         self.to_screen(
  48             '[%s] Total fragments: %s'
  49             % (self.FD_NAME, ctx['total_frags'] if not ctx['live'] else 'unknown (live)'))
  50         self.report_destination(ctx['filename'])
  51         dl = HttpQuietDownloader(
  52             self.ydl,
  53             {
  54                 'continuedl': True,
  55                 'quiet': True,
  56                 'noprogress': True,
  57                 'ratelimit': self.params.get('ratelimit'),
  58                 'retries': self.params.get('retries', 0),
  59                 'test': self.params.get('test', False),
  60             }
  61         )
  62         tmpfilename = self.temp_name(ctx['filename'])
  63         dest_stream, tmpfilename = sanitize_open(tmpfilename, 'wb')
  64         ctx.update({
  65             'dl': dl,
  66             'dest_stream': dest_stream,
  67             'tmpfilename': tmpfilename,
  68         })
  69
  70     def _start_frag_download(self, ctx):
  71         total_frags = ctx['total_frags']
  72         # This dict stores the download progress, it's updated by the progress
  73         # hook
  74         state = {
  75             'status': 'downloading',
  76             'downloaded_bytes': 0,
  77             'frag_index': 0,
  78             'frag_count': total_frags,
  79             'filename': ctx['filename'],
  80             'tmpfilename': ctx['tmpfilename'],
  81         }
  82
  83         start = time.time()
  84         ctx.update({
  85             'started': start,
  86             # Total complete fragments downloaded so far in bytes
  87             'complete_frags_downloaded_bytes': 0,
  88             # Amount of fragment's bytes downloaded by the time of the previous
  89             # frag progress hook invocation
  90             'prev_frag_downloaded_bytes': 0,
  91         })
  92
  93         def frag_progress_hook(s):
  94             if s['status'] not in ('downloading', 'finished'):
  95                 return
  96
  97             time_now = time.time()
  98             state['elapsed'] = time_now - start
  99             frag_total_bytes = s.get('total_bytes') or 0
 100             if not ctx['live']:
 101                 estimated_size = (
 102                     (ctx['complete_frags_downloaded_bytes'] + frag_total_bytes) /
 103                     (state['frag_index'] + 1) * total_frags)
 104                 state['total_bytes_estimate'] = estimated_size
 105
 106             if s['status'] == 'finished':
 107                 state['frag_index'] += 1
 108                 state['downloaded_bytes'] += frag_total_bytes - ctx['prev_frag_downloaded_bytes']
 109                 ctx['complete_frags_downloaded_bytes'] = state['downloaded_bytes']
 110                 ctx['prev_frag_downloaded_bytes'] = 0
 111             else:
 112                 frag_downloaded_bytes = s['downloaded_bytes']
 113                 state['downloaded_bytes'] += frag_downloaded_bytes - ctx['prev_frag_downloaded_bytes']
 114                 if not ctx['live']:
 115                     state['eta'] = self.calc_eta(
 116                         start, time_now, estimated_size,
 117                         state['downloaded_bytes'])
 118                 state['speed'] = s.get('speed') or ctx.get('speed')
 119                 ctx['speed'] = state['speed']
 120                 ctx['prev_frag_downloaded_bytes'] = frag_downloaded_bytes
 121             self._hook_progress(state)
 122
 123         ctx['dl'].add_progress_hook(frag_progress_hook)
 124
 125         return start
 126
 127     def _finish_frag_download(self, ctx):
 128         ctx['dest_stream'].close()
 129         elapsed = time.time() - ctx['started']
 130         self.try_rename(ctx['tmpfilename'], ctx['filename'])
 131         fsize = os.path.getsize(encodeFilename(ctx['filename']))
 132
 133         self._hook_progress({
 134             'downloaded_bytes': fsize,
 135             'total_bytes': fsize,
 136             'filename': ctx['filename'],
 137             'status': 'finished',
 138             'elapsed': elapsed,
 139         })