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discoverer: Drop new stream tags once preroll is done

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This makes sure we do not touch the stream taglist once the pipeline has
been prerolled. Adding of stream tags happens in the pad event probe
which runs in a different thread from discoverer stream processing, so
modifying the tag list while discoverer might be processing it can
sometimes cause a crash.

https://bugzilla.gnome.org/show_bug.cgi?id=639778
This commit is contained in:
Arun Raghavan 2011-01-18 01:09:53 +05:30 committed by Tim-Philipp Müller
parent 65a298fdee
commit 6ac2e5d384
1 changed files with 12 additions and 4 deletions
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16
gst-libs/gst/pbutils/gstdiscoverer.c
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@ -393,10 +393,15 @@ _event_probe (GstPad * pad, GstEvent * event, PrivateStream * ps)
gst_event_parse_tag (event, &tl);
GST_DEBUG_OBJECT (pad, "tags %" GST_PTR_FORMAT, tl);
DISCO_LOCK (ps->dc);
tmp = gst_tag_list_merge (ps->tags, tl, GST_TAG_MERGE_APPEND);
if (ps->tags)
gst_tag_list_free (ps->tags);
ps->tags = tmp;
/* If preroll is complete, drop these tags - the collected information is
* possibly already being processed and adding more tags would be racy */
if (G_LIKELY (ps->dc->priv->processing)) {
tmp = gst_tag_list_merge (ps->tags, tl, GST_TAG_MERGE_APPEND);
if (ps->tags)
gst_tag_list_free (ps->tags);
ps->tags = tmp;
} else
GST_DEBUG_OBJECT (ps->dc, "Dropping tags since preroll is done");
DISCO_UNLOCK (ps->dc);
}
@ -1143,7 +1148,10 @@ discoverer_bus_cb (GstBus * bus, GstMessage * msg, GstDiscoverer * dc)
if (dc->priv->processing) {
if (handle_message (dc, msg)) {
GST_DEBUG ("Stopping asynchronously");
/* Serialise with _event_probe() */
DISCO_LOCK (dc);
dc->priv->processing = FALSE;
DISCO_UNLOCK (dc);
discoverer_collect (dc);
discoverer_cleanup (dc);
}