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[fragment,hls,f4m,dash,ism] improve fragment downloading

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- resume immediately
- no need to concatenate segments and decrypt them on every resume
- no need to save temp files for segments

and for hls downloader:
- no need to download keys for segments that already downloaded
This commit is contained in:
Remita Amine 2016-06-28 18:07:50 +01:00
parent 58f6ab72ed
commit 75a2485407
7 changed files with 111 additions and 123 deletions
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30
youtube_dl/downloader/ism.py
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@ -1,6 +1,5 @@
from __future__ import unicode_literals
import os
import time
import struct
import binascii
@ -8,10 +7,6 @@ import io
from .fragment import FragmentFD
from ..compat import compat_urllib_error
from ..utils import (
sanitize_open,
encodeFilename,
)
u8 = struct.Struct(b'>B')
@ -225,16 +220,15 @@ class IsmFD(FragmentFD):
self._prepare_and_start_frag_download(ctx)
segments_filenames = []
fragment_retries = self.params.get('fragment_retries', 0)
skip_unavailable_fragments = self.params.get('skip_unavailable_fragments', True)
track_written = False
frag_index = 0
for i, segment in enumerate(segments):
segment_url = segment['url']
segment_name = 'Frag%d' % i
target_filename = '%s-%s' % (ctx['tmpfilename'], segment_name)
frag_index += 1
if frag_index <= ctx['frag_index']:
continue
count = 0
while count <= fragment_retries:
try:
@ -242,33 +236,27 @@ class IsmFD(FragmentFD):
'url': segment_url,
'http_headers': info_dict.get('http_headers'),
})
success, frag_content = self._download_fragment(ctx, segment['url'], info_dict)
if not success:
return False
down, target_sanitized = sanitize_open(target_filename, 'rb')
down_data = down.read()
if not track_written:
tfhd_data = extract_box_data(down_data, [b'moof', b'traf', b'tfhd'])
tfhd_data = extract_box_data(frag_content, [b'moof', b'traf', b'tfhd'])
info_dict['_download_params']['track_id'] = u32.unpack(tfhd_data[4:8])[0]
write_piff_header(ctx['dest_stream'], info_dict['_download_params'])
track_written = True
ctx['dest_stream'].write(down_data)
down.close()
segments_filenames.append(target_sanitized)
self._append_fragment(ctx, frag_content)
break
except compat_urllib_error.HTTPError as err:
count += 1
if count <= fragment_retries:
self.report_retry_fragment(err, segment_name, count, fragment_retries)
self.report_retry_fragment(err, frag_index, count, fragment_retries)
if count > fragment_retries:
if skip_unavailable_fragments:
self.report_skip_fragment(segment_name)
self.report_skip_fragment(frag_index)
continue
self.report_error('giving up after %s fragment retries' % fragment_retries)
return False
self._finish_frag_download(ctx)
for segment_file in segments_filenames:
os.remove(encodeFilename(segment_file))
return True