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parse: Don't hold element's object lock while querying element pads' caps

Browse source 
This can easily deadlock if the element uses the object lock for
something internally, like posting an error message. Use an GstIterator
for iterating over the pads instead.

https://bugzilla.gnome.org/show_bug.cgi?id=777449
This commit is contained in:
Sebastian Dröge 2017-01-18 15:07:58 +02:00
parent b3296183fc
commit 80c5fd50db
1 changed files with 28 additions and 16 deletions
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44
gst/parse/grammar.y
View file

@ -587,32 +587,44 @@ static gboolean
gst_parse_element_can_do_caps (GstElement * e, GstPadDirection dir,
GstCaps * link_caps)
{
gboolean can_do = FALSE;
GList *pads;
gboolean can_do = FALSE, done = FALSE;
GstIterator *it;
GST_OBJECT_LOCK (e);
it = (dir == GST_PAD_SRC) ? gst_element_iterate_src_pads (e) : gst_element_iterate_sink_pads (e);
pads = (dir == GST_PAD_SRC) ? e->srcpads : e->sinkpads;
while (!can_do && pads != NULL) {
GstPad *pad = pads->data;
while (!done && !can_do) {
GValue v = G_VALUE_INIT;
GstPad *pad;
GstCaps *caps;
caps = gst_pad_get_current_caps (pad);
if (caps == NULL)
caps = gst_pad_query_caps (pad, NULL);
switch (gst_iterator_next (it, &v)) {
case GST_ITERATOR_OK:
pad = g_value_get_object (&v);
can_do = gst_caps_can_intersect (caps, link_caps);
caps = gst_pad_get_current_caps (pad);
if (caps == NULL)
caps = gst_pad_query_caps (pad, NULL);
GST_TRACE ("can_do: %d for %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT,
can_do, caps, link_caps);
can_do = gst_caps_can_intersect (caps, link_caps);
gst_caps_unref (caps);
GST_TRACE ("can_do: %d for %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT,
can_do, caps, link_caps);
pads = pads->next;
gst_caps_unref (caps);
g_value_unset (&v);
break;
case GST_ITERATOR_DONE:
case GST_ITERATOR_ERROR:
done = TRUE;
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (it);
break;
}
}
GST_OBJECT_UNLOCK (e);
gst_iterator_free (it);
return can_do;
}