93 lines
3.6 KiB
Python
93 lines
3.6 KiB
Python
from __future__ import unicode_literals
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import os
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import re
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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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sanitize_open,
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encodeFilename,
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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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base_url = info_dict['url']
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segment_urls = [info_dict['segment_urls'][0]] if self.params.get('test', False) else info_dict['segment_urls']
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initialization_url = info_dict.get('initialization_url')
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ctx = {
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'filename': filename,
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'total_frags': len(segment_urls) + (1 if initialization_url else 0),
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}
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self._prepare_and_start_frag_download(ctx)
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def combine_url(base_url, target_url):
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if re.match(r'^https?://', target_url):
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return target_url
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return '%s%s%s' % (base_url, '' if base_url.endswith('/') else '/', target_url)
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segments_filenames = []
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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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def process_segment(segment, tmp_filename, fatal):
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target_url, segment_name = segment
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target_filename = '%s-%s' % (tmp_filename, segment_name)
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count = 0
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while count <= fragment_retries:
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try:
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success = ctx['dl'].download(target_filename, {'url': combine_url(base_url, target_url)})
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if not success:
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return False
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down, target_sanitized = sanitize_open(target_filename, 'rb')
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ctx['dest_stream'].write(down.read())
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down.close()
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segments_filenames.append(target_sanitized)
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break
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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 attemps
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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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count += 1
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if count <= fragment_retries:
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self.report_retry_fragment(err, segment_name, count, fragment_retries)
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if count > fragment_retries:
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if not fatal:
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self.report_skip_fragment(segment_name)
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return True
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self.report_error('giving up after %s fragment retries' % fragment_retries)
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return False
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return True
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segments_to_download = [(initialization_url, 'Init')] if initialization_url else []
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segments_to_download.extend([
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(segment_url, 'Seg%d' % i)
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for i, segment_url in enumerate(segment_urls)])
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for i, segment in enumerate(segments_to_download):
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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 = i == 0 or not skip_unavailable_fragments
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if not process_segment(segment, ctx['tmpfilename'], fatal):
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return False
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self._finish_frag_download(ctx)
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for segment_file in segments_filenames:
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os.remove(encodeFilename(segment_file))
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return True
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