]> git.bitcoin.ninja Git - youtube-dl/blob - youtube_dl/downloader/fragment.py
[arte] PEP 8
[youtube-dl] / 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         })