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videoflip: fix concurrent access when modifying the tag list

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We were checking if the tag list is writable, but it may actually be
shared through the same event (tee upstream or multiple consumers).

Fix a bug where multiple branches have a videoflip element checking the
taglist. The first one was changing the orientation back to rotate-0
which was resetting the other instances.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5099>
This commit is contained in:
Guillaume Desmottes 2023-07-25 15:15:58 +02:00 committed by Tim-Philipp Müller
parent 1a3deef85f
commit bbca6cc8c8
1 changed files with 7 additions and 11 deletions
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18
subprojects/gst-plugins-good/gst/videofilter/gstvideoflip.c
View file

@ -1790,19 +1790,15 @@ gst_video_flip_sink_event (GstBaseTransform * trans, GstEvent * event)
gst_video_flip_set_method (vf, method, TRUE);
if (vf->method == GST_VIDEO_ORIENTATION_AUTO) {
/* update the orientation tag as we rotate the video accordingly */
if (gst_tag_list_is_writable (taglist)) {
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
"image-orientation", "rotate-0", NULL);
} else {
taglist = gst_tag_list_copy (taglist);
/* Update the orientation tag as we rotate the video accordingly.
* The event (and so the tag list) can be shared so always copy both. */
taglist = gst_tag_list_copy (taglist);
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
"image-orientation", "rotate-0", NULL);
gst_tag_list_add (taglist, GST_TAG_MERGE_REPLACE,
"image-orientation", "rotate-0", NULL);
gst_event_unref (event);
event = gst_event_new_tag (taglist);
}
gst_event_unref (event);
event = gst_event_new_tag (taglist);
}
}
break;