schmittlauch/youtube-dl
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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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57
youtube_dl/downloader/fragment.py
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@ -2,6 +2,7 @@ from __future__ import division, unicode_literals
import os
import time
import io
from .common import FileDownloader
from .http import HttpFD
@ -10,6 +11,7 @@ from ..utils import (
encodeFilename,
sanitize_open,
sanitized_Request,
compat_str,
)
@ -30,13 +32,13 @@ class FragmentFD(FileDownloader):
Skip unavailable fragments (DASH and hlsnative only)
"""
def report_retry_fragment(self, err, fragment_name, count, retries):
def report_retry_fragment(self, err, frag_index, count, retries):
self.to_screen(
'[download] Got server HTTP error: %s. Retrying fragment %s (attempt %d of %s)...'
% (error_to_compat_str(err), fragment_name, count, self.format_retries(retries)))
'[download] Got server HTTP error: %s. Retrying fragment %d (attempt %d of %s)...'
% (error_to_compat_str(err), frag_index, count, self.format_retries(retries)))
def report_skip_fragment(self, fragment_name):
self.to_screen('[download] Skipping fragment %s...' % fragment_name)
def report_skip_fragment(self, frag_index):
self.to_screen('[download] Skipping fragment %d...' % frag_index)
def _prepare_url(self, info_dict, url):
headers = info_dict.get('http_headers')
@ -46,6 +48,25 @@ class FragmentFD(FileDownloader):
self._prepare_frag_download(ctx)
self._start_frag_download(ctx)
def _download_fragment(self, ctx, frag_url, info_dict, headers=None):
down = io.BytesIO()
success = ctx['dl'].download(down, {
'url': frag_url,
'http_headers': headers or info_dict.get('http_headers'),
})
if not success:
return False, None
frag_content = down.getvalue()
down.close()
return True, frag_content
def _append_fragment(self, ctx, frag_content):
ctx['dest_stream'].write(frag_content)
if not (ctx.get('live') or ctx['tmpfilename'] == '-'):
frag_index_stream, _ = sanitize_open(ctx['tmpfilename'] + '.fragindex', 'w')
frag_index_stream.write(compat_str(ctx['frag_index']))
frag_index_stream.close()
def _prepare_frag_download(self, ctx):
if 'live' not in ctx:
ctx['live'] = False
@ -66,11 +87,26 @@ class FragmentFD(FileDownloader):
}
)
tmpfilename = self.temp_name(ctx['filename'])
dest_stream, tmpfilename = sanitize_open(tmpfilename, 'wb')
open_mode = 'wb'
resume_len = 0
frag_index = 0
# Establish possible resume length
if os.path.isfile(encodeFilename(tmpfilename)):
open_mode = 'ab'
resume_len = os.path.getsize(encodeFilename(tmpfilename))
if os.path.isfile(encodeFilename(tmpfilename + '.fragindex')):
frag_index_stream, _ = sanitize_open(tmpfilename + '.fragindex', 'r')
frag_index = int(frag_index_stream.read())
frag_index_stream.close()
dest_stream, tmpfilename = sanitize_open(tmpfilename, open_mode)
ctx.update({
'dl': dl,
'dest_stream': dest_stream,
'tmpfilename': tmpfilename,
'frag_index': frag_index,
# Total complete fragments downloaded so far in bytes
'complete_frags_downloaded_bytes': resume_len,
})
def _start_frag_download(self, ctx):
@ -79,8 +115,8 @@ class FragmentFD(FileDownloader):
# hook
state = {
'status': 'downloading',
'downloaded_bytes': 0,
'frag_index': 0,
'downloaded_bytes': ctx['complete_frags_downloaded_bytes'],
'frag_index': ctx['frag_index'],
'frag_count': total_frags,
'filename': ctx['filename'],
'tmpfilename': ctx['tmpfilename'],
@ -89,8 +125,6 @@ class FragmentFD(FileDownloader):
start = time.time()
ctx.update({
'started': start,
# Total complete fragments downloaded so far in bytes
'complete_frags_downloaded_bytes': 0,
# Amount of fragment's bytes downloaded by the time of the previous
# frag progress hook invocation
'prev_frag_downloaded_bytes': 0,
@ -111,6 +145,7 @@ class FragmentFD(FileDownloader):
if s['status'] == 'finished':
state['frag_index'] += 1
ctx['frag_index'] = state['frag_index']
state['downloaded_bytes'] += frag_total_bytes - ctx['prev_frag_downloaded_bytes']
ctx['complete_frags_downloaded_bytes'] = state['downloaded_bytes']
ctx['prev_frag_downloaded_bytes'] = 0
@ -132,6 +167,8 @@ class FragmentFD(FileDownloader):
def _finish_frag_download(self, ctx):
ctx['dest_stream'].close()
if os.path.isfile(encodeFilename(ctx['tmpfilename'] + '.fragindex')):
os.remove(encodeFilename(ctx['tmpfilename'] + '.fragindex'))
elapsed = time.time() - ctx['started']
self.try_rename(ctx['tmpfilename'], ctx['filename'])
fsize = os.path.getsize(encodeFilename(ctx['filename']))