179 lines
7.6 KiB
Python
179 lines
7.6 KiB
Python
from __future__ import unicode_literals
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try:
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import concurrent.futures
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can_threaded_download = True
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except ImportError:
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can_threaded_download = False
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from ..downloader import _get_real_downloader
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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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sanitize_open,
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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. External downloaders can take over
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the fragment downloads by supporting the '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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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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real_downloader = _get_real_downloader(info_dict, 'frag_urls', self.params, None)
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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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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)
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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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fragments_to_download = []
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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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fragments_to_download.append({
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'frag_index': frag_index,
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'index': i,
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'url': fragment_url,
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})
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if real_downloader:
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self.to_screen(
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'[%s] Fragment downloads will be delegated to %s' % (self.FD_NAME, real_downloader.get_basename()))
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info_copy = info_dict.copy()
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info_copy['fragments'] = fragments_to_download
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fd = real_downloader(self.ydl, self.params)
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# TODO: Make progress updates work without hooking twice
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# for ph in self._progress_hooks:
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# fd.add_progress_hook(ph)
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success = fd.real_download(filename, info_copy)
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if not success:
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return False
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else:
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def download_fragment(fragment):
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i = fragment['index']
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frag_index = fragment['frag_index']
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fragment_url = fragment['url']
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ctx['fragment_index'] = frag_index
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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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count = 0
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while count <= fragment_retries:
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try:
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success, frag_content = self._download_fragment(ctx, fragment_url, info_dict)
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if not success:
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return False, frag_index
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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 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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count += 1
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if count <= fragment_retries:
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self.report_retry_fragment(err, frag_index, count, fragment_retries)
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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 own retry settings
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if not fatal:
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break
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raise
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if count > fragment_retries:
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if not fatal:
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return False, frag_index
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self.report_error('Giving up after %s fragment retries' % fragment_retries)
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return False, frag_index
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return frag_content, frag_index
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def append_fragment(frag_content, frag_index):
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if frag_content:
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fragment_filename = '%s-Frag%d' % (ctx['tmpfilename'], frag_index)
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try:
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file, frag_sanitized = sanitize_open(fragment_filename, 'rb')
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ctx['fragment_filename_sanitized'] = frag_sanitized
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file.close()
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self._append_fragment(ctx, frag_content)
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return True
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except FileNotFoundError:
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if skip_unavailable_fragments:
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self.report_skip_fragment(frag_index)
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return True
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else:
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self.report_error(
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'fragment %s not found, unable to continue' % frag_index)
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return False
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else:
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if skip_unavailable_fragments:
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self.report_skip_fragment(frag_index)
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return True
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else:
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self.report_error(
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'fragment %s not found, unable to continue' % frag_index)
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return False
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max_workers = self.params.get('concurrent_fragment_downloads', 1)
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if can_threaded_download and max_workers > 1:
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self.report_warning('The download speed shown is only of one thread. This is a known issue')
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with concurrent.futures.ThreadPoolExecutor(max_workers) as pool:
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futures = [pool.submit(download_fragment, fragment) for fragment in fragments_to_download]
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# timeout must be 0 to return instantly
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done, not_done = concurrent.futures.wait(futures, timeout=0)
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try:
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while not_done:
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# Check every 1 second for KeyboardInterrupt
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freshly_done, not_done = concurrent.futures.wait(not_done, timeout=1)
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done |= freshly_done
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except KeyboardInterrupt:
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for future in not_done:
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future.cancel()
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# timeout must be none to cancel
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concurrent.futures.wait(not_done, timeout=None)
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raise KeyboardInterrupt
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results = [future.result() for future in futures]
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for frag_content, frag_index in results:
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result = append_fragment(frag_content, frag_index)
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if not result:
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return False
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else:
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for fragment in fragments_to_download:
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frag_content, frag_index = download_fragment(fragment)
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result = append_fragment(frag_content, frag_index)
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if not result:
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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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