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Refactor fragments interface and dash segments downloader

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- Eliminate segment_urls and initialization_url
+ Introduce manifest_url (manifest may contain unfragmented data in this case url will be used for direct media URL and manifest_url for manifest itself correspondingly)
* Rewrite dashsegments downloader to use fragments data
* Improve generic mpd extraction
This commit is contained in:
Sergey M․
2016-09-17 20:35:22 +07:00
parent 21d21b0c72
commit 86f4d14f81
3 changed files with 26 additions and 44 deletions
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35
youtube_dl/downloader/dash.py
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@@ -1,7 +1,6 @@
from __future__ import unicode_literals
import os
import re
from .fragment import FragmentFD
from ..compat import compat_urllib_error
@@ -19,34 +18,32 @@ class DashSegmentsFD(FragmentFD):
FD_NAME = 'dashsegments'
def real_download(self, filename, info_dict):
base_url = info_dict['url']
segment_urls = [info_dict['segment_urls'][0]] if self.params.get('test', False) else info_dict['segment_urls']
initialization_url = info_dict.get('initialization_url')
segments = info_dict['fragments'][:1] if self.params.get(
'test', False) else info_dict['fragments']
ctx = {
'filename': filename,
'total_frags': len(segment_urls) + (1 if initialization_url else 0),
'total_frags': len(segments),
}
self._prepare_and_start_frag_download(ctx)
def combine_url(base_url, target_url):
if re.match(r'^https?://', target_url):
return target_url
return '%s%s%s' % (base_url, '' if base_url.endswith('/') else '/', target_url)
segments_filenames = []
fragment_retries = self.params.get('fragment_retries', 0)
skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
def process_segment(segment, tmp_filename, fatal):
target_url, segment_name = segment
def process_segment(segment, tmp_filename, num):
segment_url = segment['url']
segment_name = 'Frag%d' % num
target_filename = '%s-%s' % (tmp_filename, segment_name)
# In DASH, the first segment contains necessary headers to
# generate a valid MP4 file, so always abort for the first segment
fatal = num == 0 or not skip_unavailable_fragments
count = 0
while count <= fragment_retries:
try:
success = ctx['dl'].download(target_filename, {'url': combine_url(base_url, target_url)})
success = ctx['dl'].download(target_filename, {'url': segment_url})
if not success:
return False
down, target_sanitized = sanitize_open(target_filename, 'rb')
@@ -72,16 +69,8 @@ class DashSegmentsFD(FragmentFD):
return False
return True
segments_to_download = [(initialization_url, 'Init')] if initialization_url else []
segments_to_download.extend([
(segment_url, 'Seg%d' % i)
for i, segment_url in enumerate(segment_urls)])
for i, segment in enumerate(segments_to_download):
# In DASH, the first segment contains necessary headers to
# generate a valid MP4 file, so always abort for the first segment
fatal = i == 0 or not skip_unavailable_fragments
if not process_segment(segment, ctx['tmpfilename'], fatal):
for i, segment in enumerate(segments):
if not process_segment(segment, ctx['tmpfilename'], i):
return False
self._finish_frag_download(ctx)