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import time
import urllib.parse
from . import get_suitable_downloader
from .fragment import FragmentFD
from ..utils import update_url_query, urljoin
class DashSegmentsFD(FragmentFD):
"""
Download segments in a DASH manifest. External downloaders can take over
the fragment downloads by supporting the 'dash_frag_urls' protocol
"""
FD_NAME = 'dashsegments'
def real_download(self, filename, info_dict):
if 'http_dash_segments_generator' in info_dict['protocol'].split('+'):
real_downloader = None # No external FD can support --live-from-start
else:
if info_dict.get('is_live'):
self.report_error('Live DASH videos are not supported')
real_downloader = get_suitable_downloader(
info_dict, self.params, None, protocol='dash_frag_urls', to_stdout=(filename == '-'))
real_start = time.time()
requested_formats = [{**info_dict, **fmt} for fmt in info_dict.get('requested_formats', [])]
args = []
for fmt in requested_formats or [info_dict]:
try:
fragment_count = 1 if self.params.get('test') else len(fmt['fragments'])
except TypeError:
fragment_count = None
ctx = {
'filename': fmt.get('filepath') or filename,
'live': 'is_from_start' if fmt.get('is_from_start') else fmt.get('is_live'),
'total_frags': fragment_count,
}
if real_downloader:
self._prepare_external_frag_download(ctx)
else:
self._prepare_and_start_frag_download(ctx, fmt)
ctx['start'] = real_start
extra_query = None
extra_param_to_segment_url = info_dict.get('extra_param_to_segment_url')
if extra_param_to_segment_url:
extra_query = urllib.parse.parse_qs(extra_param_to_segment_url)
fragments_to_download = self._get_fragments(fmt, ctx, extra_query)
if real_downloader:
self.to_screen(
f'[{self.FD_NAME}] Fragment downloads will be delegated to {real_downloader.get_basename()}')
info_dict['fragments'] = list(fragments_to_download)
fd = real_downloader(self.ydl, self.params)
return fd.real_download(filename, info_dict)
args.append([ctx, fragments_to_download, fmt])
return self.download_and_append_fragments_multiple(*args, is_fatal=lambda idx: idx == 0)
def _resolve_fragments(self, fragments, ctx):
fragments = fragments(ctx) if callable(fragments) else fragments
return [next(iter(fragments))] if self.params.get('test') else fragments
def _get_fragments(self, fmt, ctx, extra_query):
fragment_base_url = fmt.get('fragment_base_url')
fragments = self._resolve_fragments(fmt['fragments'], ctx)
frag_index = 0
for i, fragment in enumerate(fragments):
frag_index += 1
if frag_index <= ctx['fragment_index']:
continue
fragment_url = fragment.get('url')
if not fragment_url:
assert fragment_base_url
fragment_url = urljoin(fragment_base_url, fragment['path'])
if extra_query:
fragment_url = update_url_query(fragment_url, extra_query)
yield {
'frag_index': frag_index,
'fragment_count': fragment.get('fragment_count'),
'index': i,
'url': fragment_url,
}
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