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Apply threading lock to HLS DRM preparation

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Without this, if two threads started at the same time there was a very good chance they would run the code and license twice, which is unnecessary.
This commit is contained in:
rlaphoenix 2023-03-04 11:41:10 +00:00
parent 0bceb772c2
commit f8166f098c
1 changed files with 32 additions and 29 deletions
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61
devine/core/manifests/hls.py
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@ -11,7 +11,7 @@ from functools import partial
from hashlib import md5
from pathlib import Path
from queue import Queue
from threading import Event
from threading import Event, Lock
from typing import Any, Callable, Optional, Union
import m3u8
@ -214,6 +214,8 @@ class HLS:
log.error("Track's HLS playlist has no segments, expecting an invariant M3U8 playlist.")
sys.exit(1)
drm_lock = Lock()
def download_segment(filename: str, segment: m3u8.Segment, init_data: Queue, segment_key: Queue) -> int:
if stop_event.is_set():
# the track already started downloading, but another failed or was stopped
@ -221,34 +223,35 @@ class HLS:
segment_save_path = (save_dir / filename).with_suffix(".mp4")
newest_segment_key = segment_key.get()
try:
if segment.key and newest_segment_key[1] != segment.key:
try:
drm = HLS.get_drm(
# TODO: We append master.keys because m3u8 class only puts the last EXT-X-KEY
# to the segment.key property, not supporting multi-drm scenarios.
# By re-adding every single EXT-X-KEY found, we can at least try to get
# a suitable key. However, it may not match the right segment/timeframe!
# It will try to use the first key provided where possible.
keys=[segment.key] + master.keys,
proxy=proxy
)
except NotImplementedError as e:
log.error(str(e))
sys.exit(1)
else:
if drm:
drm = drm[0] # just use the first supported DRM system for now
log.debug("Got segment key, %s", drm)
if isinstance(drm, Widevine):
# license and grab content keys
if not license_widevine:
raise ValueError("license_widevine func must be supplied to use Widevine DRM")
license_widevine(drm)
newest_segment_key = (drm, segment.key)
finally:
segment_key.put(newest_segment_key)
with drm_lock:
newest_segment_key = segment_key.get()
try:
if segment.key and newest_segment_key[1] != segment.key:
try:
drm = HLS.get_drm(
# TODO: We append master.keys because m3u8 class only puts the last EXT-X-KEY
# to the segment.key property, not supporting multi-drm scenarios.
# By re-adding every single EXT-X-KEY found, we can at least try to get
# a suitable key. However, it may not match the right segment/timeframe!
# It will try to use the first key provided where possible.
keys=[segment.key] + master.keys,
proxy=proxy
)
except NotImplementedError as e:
log.error(str(e))
sys.exit(1)
else:
if drm:
drm = drm[0] # just use the first supported DRM system for now
log.debug("Got segment key, %s", drm)
if isinstance(drm, Widevine):
# license and grab content keys
if not license_widevine:
raise ValueError("license_widevine func must be supplied to use Widevine DRM")
license_widevine(drm)
newest_segment_key = (drm, segment.key)
finally:
segment_key.put(newest_segment_key)
if callable(track.OnSegmentFilter) and track.OnSegmentFilter(segment):
return 0