import os
import time
+import json
from .common import FileDownloader
from .http import HttpFD
from ..utils import (
+ error_to_compat_str,
encodeFilename,
sanitize_open,
+ sanitized_Request,
)
class FragmentFD(FileDownloader):
"""
A base file downloader class for fragmented media (e.g. f4m/m3u8 manifests).
+
+ Available options:
+
+ fragment_retries: Number of times to retry a fragment for HTTP error (DASH
+ and hlsnative only)
+ skip_unavailable_fragments:
+ Skip unavailable fragments (DASH and hlsnative only)
+ keep_fragments: Keep downloaded fragments on disk after downloading is
+ finished
+
+ For each incomplete fragment download youtube-dl keeps on disk a special
+ bookkeeping file with download state and metadata (in future such files will
+ be used for any incomplete download handled by youtube-dl). This file is
+ used to properly handle resuming, check download file consistency and detect
+ potential errors. The file has a .ytdl extension and represents a standard
+ JSON file of the following format:
+
+ extractor:
+ Dictionary of extractor related data. TBD.
+
+ downloader:
+ Dictionary of downloader related data. May contain following data:
+ current_fragment:
+ Dictionary with current (being downloaded) fragment data:
+ index: 0-based index of current fragment among all fragments
+ fragment_count:
+ Total count of fragments
+
+ This feature is experimental and file format may change in future.
"""
+ def report_retry_fragment(self, err, frag_index, count, retries):
+ self.to_screen(
+ '[download] Got server HTTP error: %s. Retrying fragment %d (attempt %d of %s)...'
+ % (error_to_compat_str(err), frag_index, count, self.format_retries(retries)))
+
+ def report_skip_fragment(self, frag_index):
+ self.to_screen('[download] Skipping fragment %d...' % frag_index)
+
+ def _prepare_url(self, info_dict, url):
+ headers = info_dict.get('http_headers')
+ return sanitized_Request(url, None, headers) if headers else url
+
def _prepare_and_start_frag_download(self, ctx):
self._prepare_frag_download(ctx)
self._start_frag_download(ctx)
+ @staticmethod
+ def __do_ytdl_file(ctx):
+ return not ctx['live'] and not ctx['tmpfilename'] == '-'
+
+ def _read_ytdl_file(self, ctx):
+ assert 'ytdl_corrupt' not in ctx
+ stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r')
+ try:
+ ctx['fragment_index'] = json.loads(stream.read())['downloader']['current_fragment']['index']
+ except Exception:
+ ctx['ytdl_corrupt'] = True
+ finally:
+ stream.close()
+
+ def _write_ytdl_file(self, ctx):
+ frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w')
+ downloader = {
+ 'current_fragment': {
+ 'index': ctx['fragment_index'],
+ },
+ }
+ if ctx.get('fragment_count') is not None:
+ downloader['fragment_count'] = ctx['fragment_count']
+ frag_index_stream.write(json.dumps({'downloader': downloader}))
+ frag_index_stream.close()
+
+ def _download_fragment(self, ctx, frag_url, info_dict, headers=None):
+ fragment_filename = '%s-Frag%d' % (ctx['tmpfilename'], ctx['fragment_index'])
+ success = ctx['dl'].download(fragment_filename, {
+ 'url': frag_url,
+ 'http_headers': headers or info_dict.get('http_headers'),
+ })
+ if not success:
+ return False, None
+ down, frag_sanitized = sanitize_open(fragment_filename, 'rb')
+ ctx['fragment_filename_sanitized'] = frag_sanitized
+ frag_content = down.read()
+ down.close()
+ return True, frag_content
+
+ def _append_fragment(self, ctx, frag_content):
+ try:
+ ctx['dest_stream'].write(frag_content)
+ ctx['dest_stream'].flush()
+ finally:
+ if self.__do_ytdl_file(ctx):
+ self._write_ytdl_file(ctx)
+ if not self.params.get('keep_fragments', False):
+ os.remove(encodeFilename(ctx['fragment_filename_sanitized']))
+ del ctx['fragment_filename_sanitized']
+
def _prepare_frag_download(self, ctx):
if 'live' not in ctx:
ctx['live'] = False
+ if not ctx['live']:
+ total_frags_str = '%d' % ctx['total_frags']
+ ad_frags = ctx.get('ad_frags', 0)
+ if ad_frags:
+ total_frags_str += ' (not including %d ad)' % ad_frags
+ else:
+ total_frags_str = 'unknown (live)'
self.to_screen(
- '[%s] Total fragments: %s'
- % (self.FD_NAME, ctx['total_frags'] if not ctx['live'] else 'unknown (live)'))
+ '[%s] Total fragments: %s' % (self.FD_NAME, total_frags_str))
self.report_destination(ctx['filename'])
dl = HttpQuietDownloader(
self.ydl,
'noprogress': True,
'ratelimit': self.params.get('ratelimit'),
'retries': self.params.get('retries', 0),
+ 'nopart': self.params.get('nopart', False),
'test': self.params.get('test', False),
}
)
tmpfilename = self.temp_name(ctx['filename'])
- dest_stream, tmpfilename = sanitize_open(tmpfilename, 'wb')
+ open_mode = 'wb'
+ resume_len = 0
+
+ # Establish possible resume length
+ if os.path.isfile(encodeFilename(tmpfilename)):
+ open_mode = 'ab'
+ resume_len = os.path.getsize(encodeFilename(tmpfilename))
+
+ # Should be initialized before ytdl file check
+ ctx.update({
+ 'tmpfilename': tmpfilename,
+ 'fragment_index': 0,
+ })
+
+ if self.__do_ytdl_file(ctx):
+ if os.path.isfile(encodeFilename(self.ytdl_filename(ctx['filename']))):
+ self._read_ytdl_file(ctx)
+ is_corrupt = ctx.get('ytdl_corrupt') is True
+ is_inconsistent = ctx['fragment_index'] > 0 and resume_len == 0
+ if is_corrupt or is_inconsistent:
+ message = (
+ '.ytdl file is corrupt' if is_corrupt else
+ 'Inconsistent state of incomplete fragment download')
+ self.report_warning(
+ '%s. Restarting from the beginning...' % message)
+ ctx['fragment_index'] = resume_len = 0
+ if 'ytdl_corrupt' in ctx:
+ del ctx['ytdl_corrupt']
+ self._write_ytdl_file(ctx)
+ else:
+ self._write_ytdl_file(ctx)
+ assert ctx['fragment_index'] == 0
+
+ dest_stream, tmpfilename = sanitize_open(tmpfilename, open_mode)
+
ctx.update({
'dl': dl,
'dest_stream': dest_stream,
'tmpfilename': tmpfilename,
+ # Total complete fragments downloaded so far in bytes
+ 'complete_frags_downloaded_bytes': resume_len,
})
def _start_frag_download(self, ctx):
# hook
state = {
'status': 'downloading',
- 'downloaded_bytes': 0,
- 'frag_index': 0,
- 'frag_count': total_frags,
+ 'downloaded_bytes': ctx['complete_frags_downloaded_bytes'],
+ 'fragment_index': ctx['fragment_index'],
+ 'fragment_count': total_frags,
'filename': ctx['filename'],
'tmpfilename': ctx['tmpfilename'],
}
start = time.time()
ctx.update({
'started': start,
- # Total complete fragments downloaded so far in bytes
- 'complete_frags_downloaded_bytes': 0,
# Amount of fragment's bytes downloaded by the time of the previous
# frag progress hook invocation
'prev_frag_downloaded_bytes': 0,
if not ctx['live']:
estimated_size = (
(ctx['complete_frags_downloaded_bytes'] + frag_total_bytes) /
- (state['frag_index'] + 1) * total_frags)
+ (state['fragment_index'] + 1) * total_frags)
state['total_bytes_estimate'] = estimated_size
if s['status'] == 'finished':
- state['frag_index'] += 1
+ state['fragment_index'] += 1
+ ctx['fragment_index'] = state['fragment_index']
state['downloaded_bytes'] += frag_total_bytes - ctx['prev_frag_downloaded_bytes']
ctx['complete_frags_downloaded_bytes'] = state['downloaded_bytes']
ctx['prev_frag_downloaded_bytes'] = 0
state['eta'] = self.calc_eta(
start, time_now, estimated_size,
state['downloaded_bytes'])
- state['speed'] = s.get('speed')
+ state['speed'] = s.get('speed') or ctx.get('speed')
+ ctx['speed'] = state['speed']
ctx['prev_frag_downloaded_bytes'] = frag_downloaded_bytes
self._hook_progress(state)
def _finish_frag_download(self, ctx):
ctx['dest_stream'].close()
+ if self.__do_ytdl_file(ctx):
+ ytdl_filename = encodeFilename(self.ytdl_filename(ctx['filename']))
+ if os.path.isfile(ytdl_filename):
+ os.remove(ytdl_filename)
elapsed = time.time() - ctx['started']
- self.try_rename(ctx['tmpfilename'], ctx['filename'])
- fsize = os.path.getsize(encodeFilename(ctx['filename']))
+
+ if ctx['tmpfilename'] == '-':
+ downloaded_bytes = ctx['complete_frags_downloaded_bytes']
+ else:
+ self.try_rename(ctx['tmpfilename'], ctx['filename'])
+ downloaded_bytes = os.path.getsize(encodeFilename(ctx['filename']))
self._hook_progress({
- 'downloaded_bytes': fsize,
- 'total_bytes': fsize,
+ 'downloaded_bytes': downloaded_bytes,
+ 'total_bytes': downloaded_bytes,
'filename': ctx['filename'],
'status': 'finished',
'elapsed': elapsed,
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