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Release the group lock when setting states

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Release the group lock while we perform the state changes on the uridecodebins
because that might trigger callbacks that we need to handle with the group lock
taken. Avoids a possible deadly embrace in some id3/flac files.
Fixes #567396.
This commit is contained in:
Wim Taymans 2009-02-25 10:08:29 +01:00
parent 0b2238b70b
commit dbfc80cd6c
1 changed files with 11 additions and 2 deletions
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13
gst/playback/gstplaybin2.c
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@ -2185,6 +2185,7 @@ notify_source_cb (GstElement * uridecodebin, GParamSpec * pspec,
g_object_notify (G_OBJECT (playbin), "source");
}
/* must be called with the group lock */
static gboolean
group_set_locked_state_unlocked (GstPlayBin * playbin, GstSourceGroup * group,
gboolean locked)
@ -2311,7 +2312,14 @@ activate_group (GstPlayBin * playbin, GstSourceGroup * group)
/* we have 2 pending no-more-pads */
group->pending = 2;
}
/* release the group lock before setting the state of the decodebins, they
* might fire signals in this thread that we need to handle with the
* group_lock taken. */
GST_SOURCE_GROUP_UNLOCK (group);
if (suburidecodebin) {
if (gst_element_set_state (suburidecodebin,
GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE)
goto suburidecodebin_failure;
@ -2320,6 +2328,7 @@ activate_group (GstPlayBin * playbin, GstSourceGroup * group)
GST_STATE_PAUSED) == GST_STATE_CHANGE_FAILURE)
goto uridecodebin_failure;
GST_SOURCE_GROUP_LOCK (group);
/* alow state changes of the playbin2 affect the group elements now */
group_set_locked_state_unlocked (playbin, group, FALSE);
group->active = TRUE;
@ -2336,13 +2345,11 @@ no_decodebin:
suburidecodebin_failure:
{
GST_DEBUG_OBJECT (playbin, "failed state change of subtitle uridecodebin");
GST_SOURCE_GROUP_UNLOCK (group);
return FALSE;
}
uridecodebin_failure:
{
GST_DEBUG_OBJECT (playbin, "failed state change of uridecodebin");
GST_SOURCE_GROUP_UNLOCK (group);
return FALSE;
}
}
@ -2546,6 +2553,8 @@ gst_play_bin_change_state (GstElement * element, GstStateChange transition)
save_current_group (playbin);
break;
case GST_STATE_CHANGE_READY_TO_NULL:
/* make sure the groups don't perform a state change anymore until we
* enable them again */
groups_set_locked_state (playbin, TRUE);
break;
default: