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[youtubedl] / 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 self.to_screen('[%s] Total fragments: %d' % (self.FD_NAME, ctx['total_frags']))
30 self.report_destination(ctx['filename'])
31 dl = HttpQuietDownloader(
32 self.ydl,
33 {
34 'continuedl': True,
35 'quiet': True,
36 'noprogress': True,
37 'ratelimit': self.params.get('ratelimit', None),
38 'retries': self.params.get('retries', 0),
39 'test': self.params.get('test', False),
40 }
41 )
42 tmpfilename = self.temp_name(ctx['filename'])
43 dest_stream, tmpfilename = sanitize_open(tmpfilename, 'wb')
44 ctx.update({
45 'dl': dl,
46 'dest_stream': dest_stream,
47 'tmpfilename': tmpfilename,
48 })
49
50 def _start_frag_download(self, ctx):
51 total_frags = ctx['total_frags']
52 # This dict stores the download progress, it's updated by the progress
53 # hook
54 state = {
55 'status': 'downloading',
56 'downloaded_bytes': 0,
57 'frag_index': 0,
58 'frag_count': total_frags,
59 'filename': ctx['filename'],
60 'tmpfilename': ctx['tmpfilename'],
61 }
62 start = time.time()
63 ctx['started'] = start
64
65 def frag_progress_hook(s):
66 if s['status'] not in ('downloading', 'finished'):
67 return
68
69 frag_total_bytes = s.get('total_bytes', 0)
70 if s['status'] == 'finished':
71 state['downloaded_bytes'] += frag_total_bytes
72 state['frag_index'] += 1
73
74 estimated_size = (
75 (state['downloaded_bytes'] + frag_total_bytes) /
76 (state['frag_index'] + 1) * total_frags)
77 time_now = time.time()
78 state['total_bytes_estimate'] = estimated_size
79 state['elapsed'] = time_now - start
80
81 if s['status'] == 'finished':
82 progress = self.calc_percent(state['frag_index'], total_frags)
83 else:
84 frag_downloaded_bytes = s['downloaded_bytes']
85 frag_progress = self.calc_percent(frag_downloaded_bytes,
86 frag_total_bytes)
87 progress = self.calc_percent(state['frag_index'], total_frags)
88 progress += frag_progress / float(total_frags)
89
90 state['eta'] = self.calc_eta(
91 start, time_now, estimated_size, state['downloaded_bytes'] + frag_downloaded_bytes)
92 state['speed'] = s.get('speed')
93 self._hook_progress(state)
94
95 ctx['dl'].add_progress_hook(frag_progress_hook)
96
97 return start
98
99 def _finish_frag_download(self, ctx):
100 ctx['dest_stream'].close()
101 elapsed = time.time() - ctx['started']
102 self.try_rename(ctx['tmpfilename'], ctx['filename'])
103 fsize = os.path.getsize(encodeFilename(ctx['filename']))
104
105 self._hook_progress({
106 'downloaded_bytes': fsize,
107 'total_bytes': fsize,
108 'filename': ctx['filename'],
109 'status': 'finished',
110 'elapsed': elapsed,
111 })