84 lines
3.3 KiB
Python
84 lines
3.3 KiB
Python
from __future__ import unicode_literals
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import itertools
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from .fragment import FragmentFD
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from ..compat import compat_urllib_error
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from ..utils import (
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DownloadError,
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urljoin,
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)
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class DashSegmentsFD(FragmentFD):
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"""
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Download segments in a DASH manifest
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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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fragment_base_url = info_dict.get('fragment_base_url')
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fragments = info_dict['fragments'][:1] if self.params.get(
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'test', False) else info_dict['fragments']
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ctx = {
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'filename': filename,
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'total_frags': len(fragments),
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}
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self._prepare_and_start_frag_download(ctx)
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fragment_retries = self.params.get('fragment_retries', 0)
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skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
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for frag_index, fragment in enumerate(fragments, 1):
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if frag_index <= ctx['fragment_index']:
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continue
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success = False
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# In DASH, the first segment contains necessary headers to
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# generate a valid MP4 file, so always abort for the first segment
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fatal = frag_index == 1 or not skip_unavailable_fragments
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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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headers = info_dict.get('http_headers')
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fragment_range = fragment.get('range')
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if fragment_range:
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headers = headers.copy() if headers else {}
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headers['Range'] = 'bytes=%s' % (fragment_range,)
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for count in itertools.count():
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try:
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success, frag_content = self._download_fragment(ctx, fragment_url, info_dict, headers)
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if not success:
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return False
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self._append_fragment(ctx, frag_content)
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except compat_urllib_error.HTTPError as err:
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# YouTube may often return 404 HTTP error for a fragment causing the
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# whole download to fail. However if the same fragment is immediately
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# retried with the same request data this usually succeeds (1-2 attempts
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# is usually enough) thus allowing to download the whole file successfully.
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# To be future-proof we will retry all fragments that fail with any
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# HTTP error.
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if count < fragment_retries:
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self.report_retry_fragment(err, frag_index, count + 1, fragment_retries)
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continue
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except DownloadError:
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# Don't retry fragment if error occurred during HTTP downloading
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# itself since it has its own retry settings
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if fatal:
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raise
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break
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if not success:
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if not fatal:
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self.report_skip_fragment(frag_index)
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continue
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self.report_error('giving up after %s fragment retries' % count)
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return False
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self._finish_frag_download(ctx)
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return True
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