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