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videorate: Avoid overflow in calculations

Browse source 
base_ts and next_end_ts are both guint64. Use explicit check to avoid "negative"
timestamps (which would overflow, not be negative).

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8286>
This commit is contained in:
Edward Hervey 2025-01-03 11:59:43 +01:00 committed by GStreamer Marge Bot
parent 84f995dd90
commit 344ef36b5a
1 changed files with 6 additions and 2 deletions
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8
subprojects/gst-plugins-base/gst/videorate/gstvideorate.c
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@ -1921,8 +1921,12 @@ gst_video_rate_transform_ip (GstBaseTransform * trans, GstBuffer * buffer)
next_ts = videorate->base_ts - (
(videorate->base_ts - next_ts) * videorate->rate);
next_end_ts = videorate->base_ts - (MAX (0,
(videorate->base_ts - next_end_ts)) * videorate->rate);
if (videorate->base_ts > next_end_ts)
next_end_ts =
videorate->base_ts - ((videorate->base_ts -
next_end_ts) * videorate->rate);
else
next_end_ts = videorate->base_ts;
diff1 = ABSDIFF (prev_endtime, next_end_ts);
diff2 = ABSDIFF (in_endtime, next_end_ts);