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decodebin: Shut down all elements explicitly to NULL state before freeing the decode chain

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Due to transient locked state during autoplugging, some elements might be
ignored by the GstBin::change_state() and might still be running. Which could
then cause pad-added and similar accessing decodebin state that does not exist
anymore, and crash.

https://bugzilla.gnome.org/show_bug.cgi?id=763625
This commit is contained in:
Sebastian Dröge 2016-03-14 17:06:53 +02:00
parent 65390b5129
commit 9c2d76fb9f
1 changed files with 75 additions and 0 deletions
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75
gst/playback/gstdecodebin2.c
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@ -5165,6 +5165,80 @@ unblock_pads (GstDecodeBin * dbin)
dbin->blocked_pads = NULL;
}
static void
gst_decode_chain_stop (GstDecodeBin * dbin, GstDecodeChain * chain,
GQueue * elements)
{
GQueue *internal_elements, internal_elements_ = G_QUEUE_INIT;
GList *l;
CHAIN_MUTEX_LOCK (chain);
if (elements) {
internal_elements = elements;
} else {
internal_elements = &internal_elements_;
}
for (l = chain->next_groups; l; l = l->next) {
GstDecodeGroup *group = l->data;
GList *m;
for (m = group->children; m; m = m->next) {
GstDecodeChain *chain2 = m->data;
gst_decode_chain_stop (dbin, chain2, internal_elements);
}
if (group->multiqueue)
g_queue_push_head (internal_elements, gst_object_ref (group->multiqueue));
}
if (chain->active_group) {
for (l = chain->active_group->children; l; l = l->next) {
GstDecodeChain *chain2 = l->data;
gst_decode_chain_stop (dbin, chain2, internal_elements);
}
if (chain->active_group->multiqueue)
g_queue_push_head (internal_elements,
gst_object_ref (chain->active_group->multiqueue));
}
for (l = chain->old_groups; l; l = l->next) {
GstDecodeGroup *group = l->data;
GList *m;
for (m = group->children; m; m = m->next) {
GstDecodeChain *chain2 = m->data;
gst_decode_chain_stop (dbin, chain2, internal_elements);
}
if (group->multiqueue)
g_queue_push_head (internal_elements, gst_object_ref (group->multiqueue));
}
for (l = chain->elements; l; l = l->next) {
GstDecodeElement *delem = l->data;
if (delem->capsfilter)
g_queue_push_head (internal_elements, gst_object_ref (delem->capsfilter));
g_queue_push_head (internal_elements, gst_object_ref (delem->element));
}
CHAIN_MUTEX_UNLOCK (chain);
if (!elements) {
GstElement *element;
EXPOSE_UNLOCK (dbin);
/* Shut down from bottom to top */
while ((element = g_queue_pop_tail (internal_elements))) {
/* The bin must never ever change the state of this element anymore */
gst_element_set_locked_state (element, TRUE);
gst_element_set_state (element, GST_STATE_NULL);
gst_object_unref (element);
}
g_queue_clear (internal_elements);
EXPOSE_LOCK (dbin);
}
}
static GstStateChangeReturn
gst_decode_bin_change_state (GstElement * element, GstStateChange transition)
{
@ -5229,6 +5303,7 @@ gst_decode_bin_change_state (GstElement * element, GstStateChange transition)
do_async_done (dbin);
EXPOSE_LOCK (dbin);
if (dbin->decode_chain) {
gst_decode_chain_stop (dbin, dbin->decode_chain, NULL);
chain_to_free = dbin->decode_chain;
gst_decode_chain_free_internal (dbin->decode_chain, TRUE);
dbin->decode_chain = NULL;