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elements: Fix pad callbacks so they handle when parent goes away

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1) We need to lock and get a strong ref to the parent, if still there.
2) If it has gone away, we need to handle that gracefully.

This is necessary in order to safely modify a running pipeline. Has been
observed when a streaming thread is doing a buffer_alloc() while an
application thread sends an event on a pad further downstream, and from
within a pad probe (holding STREAM_LOCK) carries out the pipeline plumbing
while the streaming thread has its buffer_alloc() in progress.
This commit is contained in:
Ole André Vadla Ravnås 2011-01-06 18:11:31 +01:00 committed by Sebastian Dröge
parent e7bf5484c7
commit 037efe8738
5 changed files with 64 additions and 9 deletions
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21
plugins/elements/gstfunnel.c
View file

@ -191,7 +191,10 @@ gst_funnel_sink_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** buf)
{
GstFunnel *funnel = GST_FUNNEL (gst_pad_get_parent_element (pad));
GstFlowReturn ret = GST_FLOW_OK;
GstFlowReturn ret;
if (G_UNLIKELY (funnel == NULL))
return GST_FLOW_WRONG_STATE;
ret = gst_pad_alloc_buffer (funnel->srcpad, offset, size, caps, buf);
@ -246,6 +249,9 @@ gst_funnel_sink_getcaps (GstPad * pad)
GstFunnel *funnel = GST_FUNNEL (gst_pad_get_parent (pad));
GstCaps *caps;
if (G_UNLIKELY (funnel == NULL))
return gst_caps_new_any ();
caps = gst_pad_peer_get_caps_reffed (funnel->srcpad);
if (caps == NULL)
caps = gst_caps_copy (gst_pad_get_pad_template_caps (pad));
@ -327,6 +333,11 @@ gst_funnel_sink_event (GstPad * pad, GstEvent * event)
gboolean forward = TRUE;
gboolean res = TRUE;
if (G_UNLIKELY (funnel == NULL)) {
gst_event_unref (event);
return FALSE;
}
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
@ -346,7 +357,6 @@ gst_funnel_sink_event (GstPad * pad, GstEvent * event)
GST_OBJECT_UNLOCK (funnel);
forward = FALSE;
gst_event_unref (event);
}
break;
case GST_EVENT_FLUSH_STOP:
@ -363,6 +373,8 @@ gst_funnel_sink_event (GstPad * pad, GstEvent * event)
if (forward)
res = gst_pad_push_event (funnel->srcpad, event);
else
gst_event_unref (event);
gst_object_unref (funnel);
@ -379,7 +391,10 @@ gst_funnel_src_event (GstPad * pad, GstEvent * event)
gboolean done = FALSE;
funnel = gst_pad_get_parent_element (pad);
g_return_val_if_fail (funnel != NULL, FALSE);
if (G_UNLIKELY (funnel == NULL)) {
gst_event_unref (event);
return FALSE;
}
iter = gst_element_iterate_sink_pads (funnel);

11
plugins/elements/gstinputselector.c
View file

@ -386,6 +386,10 @@ gst_selector_pad_event (GstPad * pad, GstEvent * event)
GstPad *active_sinkpad;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL)) {
gst_event_unref (event);
return FALSE;
}
selpad = GST_SELECTOR_PAD_CAST (pad);
GST_INPUT_SELECTOR_LOCK (sel);
@ -513,6 +517,8 @@ gst_selector_pad_getcaps (GstPad * pad)
GstCaps *caps;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL))
return gst_caps_new_any ();
GST_DEBUG_OBJECT (sel, "Getting caps of srcpad peer");
caps = gst_pad_peer_get_caps_reffed (sel->srcpad);
@ -531,6 +537,8 @@ gst_selector_pad_acceptcaps (GstPad * pad, GstCaps * caps)
gboolean res;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL))
return FALSE;
GST_DEBUG_OBJECT (sel, "Checking acceptcaps of srcpad peer");
res = gst_pad_peer_accept_caps (sel->srcpad, caps);
@ -550,6 +558,9 @@ gst_selector_pad_bufferalloc (GstPad * pad, guint64 offset,
GstSelectorPad *selpad;
sel = GST_INPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL))
return GST_FLOW_WRONG_STATE;
selpad = GST_SELECTOR_PAD_CAST (pad);
GST_LOG_OBJECT (pad, "received alloc");

16
plugins/elements/gstoutputselector.c
View file

@ -294,10 +294,13 @@ gst_output_selector_get_property (GObject * object, guint prop_id,
static GstCaps *
gst_output_selector_sink_getcaps (GstPad * pad)
{
GstOutputSelector *sel = GST_OUTPUT_SELECTOR (GST_PAD_PARENT (pad));
GstOutputSelector *sel = GST_OUTPUT_SELECTOR (gst_pad_get_parent (pad));
GstPad *active = NULL;
GstCaps *caps = NULL;
if (G_UNLIKELY (sel == NULL))
return gst_caps_new_any ();
GST_OBJECT_LOCK (sel);
if (sel->pending_srcpad)
active = gst_object_ref (sel->pending_srcpad);
@ -312,6 +315,8 @@ gst_output_selector_sink_getcaps (GstPad * pad)
if (caps == NULL) {
caps = gst_caps_new_any ();
}
gst_object_unref (sel);
return caps;
}
@ -363,7 +368,9 @@ gst_output_selector_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstFlowReturn res;
GstPad *allocpad;
sel = GST_OUTPUT_SELECTOR (GST_PAD_PARENT (pad));
sel = GST_OUTPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL))
return GST_FLOW_WRONG_STATE;
res = GST_FLOW_NOT_LINKED;
GST_OBJECT_LOCK (sel);
@ -390,6 +397,7 @@ gst_output_selector_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GST_DEBUG_OBJECT (sel, "buffer alloc finished: %s", gst_flow_get_name (res));
gst_object_unref (sel);
return res;
}
@ -579,6 +587,10 @@ gst_output_selector_handle_sink_event (GstPad * pad, GstEvent * event)
GstPad *output_pad = NULL;
sel = GST_OUTPUT_SELECTOR (gst_pad_get_parent (pad));
if (G_UNLIKELY (sel == NULL)) {
gst_event_unref (event);
return FALSE;
}
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:

20
plugins/elements/gstqueue.c
View file

@ -472,11 +472,15 @@ gst_queue_acceptcaps (GstPad * pad, GstCaps * caps)
GstQueue *queue;
GstPad *otherpad;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (G_UNLIKELY (queue == NULL))
return FALSE;
otherpad = (pad == queue->srcpad ? queue->sinkpad : queue->srcpad);
result = gst_pad_peer_accept_caps (otherpad, caps);
gst_object_unref (queue);
return result;
}
@ -545,11 +549,14 @@ gst_queue_bufferalloc (GstPad * pad, guint64 offset, guint size, GstCaps * caps,
GstQueue *queue;
GstFlowReturn result;
queue = GST_QUEUE (GST_PAD_PARENT (pad));
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (G_UNLIKELY (queue == NULL))
return GST_FLOW_WRONG_STATE;
/* Forward to src pad, without setting caps on the src pad */
result = gst_pad_alloc_buffer (queue->srcpad, offset, size, caps, buf);
gst_object_unref (queue);
return result;
}
@ -804,7 +811,11 @@ gst_queue_handle_sink_event (GstPad * pad, GstEvent * event)
{
GstQueue *queue;
queue = GST_QUEUE (GST_OBJECT_PARENT (pad));
queue = GST_QUEUE (gst_pad_get_parent (pad));
if (G_UNLIKELY (queue == NULL)) {
gst_event_unref (event);
return FALSE;
}
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
@ -865,6 +876,7 @@ gst_queue_handle_sink_event (GstPad * pad, GstEvent * event)
break;
}
done:
gst_object_unref (queue);
return TRUE;
/* ERRORS */
@ -873,6 +885,7 @@ out_flushing:
GST_CAT_LOG_OBJECT (queue_dataflow, queue,
"refusing event, we are flushing");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_object_unref (queue);
gst_event_unref (event);
return FALSE;
}
@ -880,6 +893,7 @@ out_eos:
{
GST_CAT_LOG_OBJECT (queue_dataflow, queue, "refusing event, we are EOS");
GST_QUEUE_MUTEX_UNLOCK (queue);
gst_object_unref (queue);
gst_event_unref (event);
return FALSE;
}

5
plugins/elements/gsttee.c
View file

@ -551,7 +551,9 @@ gst_tee_buffer_alloc (GstPad * pad, guint64 offset, guint size,
GstFlowReturn res;
GstPad *allocpad;
tee = GST_TEE_CAST (GST_PAD_PARENT (pad));
tee = GST_TEE_CAST (gst_pad_get_parent (pad));
if (G_UNLIKELY (tee == NULL))
return GST_FLOW_WRONG_STATE;
res = GST_FLOW_NOT_LINKED;
@ -587,6 +589,7 @@ gst_tee_buffer_alloc (GstPad * pad, guint64 offset, guint size,
}
GST_OBJECT_UNLOCK (tee);
gst_object_unref (tee);
return res;
}