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queue2: Defer downstream bitrate query to the streaming thread.

Browse source 
When we want to perform a downstream bitrate query, just
set the reconfigure flag on the srcpad and get the streaming
thread to do it. That avoids emitting a downstream query
when receiving the upstream RECONFIGURE event - which can
lead to deadlocks if downstream is sending the event from
within a lock - e.g. input-selector.

If querying the downstream bitrate changes the cached
value, then make sure to update our buffering state
and potentially post a BUFFERING message to the application.

Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/566
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/501>
This commit is contained in:
Jan Schmidt 2020-05-27 03:41:37 +10:00 committed by GStreamer Merge Bot
parent f2478618b5
commit 8e670a23b0
1 changed files with 23 additions and 5 deletions
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28
plugins/elements/gstqueue2.c
View file

@ -314,6 +314,7 @@ static void update_cur_level (GstQueue2 * queue, GstQueue2Range * range);
static void update_in_rates (GstQueue2 * queue, gboolean force);
static GstMessage *gst_queue2_get_buffering_message (GstQueue2 * queue,
gint * percent);
static void update_buffering (GstQueue2 * queue);
static void gst_queue2_post_buffering (GstQueue2 * queue);
typedef enum
@ -833,6 +834,7 @@ query_downstream_bitrate (GstQueue2 * queue)
{
GstQuery *query = gst_query_new_bitrate ();
guint downstream_bitrate = 0;
gboolean changed;
if (gst_pad_peer_query (queue->srcpad, query)) {
gst_query_parse_bitrate (query, &downstream_bitrate);
@ -845,10 +847,17 @@ query_downstream_bitrate (GstQueue2 * queue)
gst_query_unref (query);
GST_QUEUE2_MUTEX_LOCK (queue);
changed = queue->downstream_bitrate != downstream_bitrate;
queue->downstream_bitrate = downstream_bitrate;
GST_QUEUE2_MUTEX_UNLOCK (queue);
g_object_notify_by_pspec (G_OBJECT (queue), obj_props[PROP_BITRATE]);
if (changed) {
if (queue->use_buffering)
update_buffering (queue);
gst_queue2_post_buffering (queue);
g_object_notify_by_pspec (G_OBJECT (queue), obj_props[PROP_BITRATE]);
}
}
/* take a buffer and update segment, updating the time level of the queue. */
@ -3052,6 +3061,11 @@ next:
GST_QUEUE2_MUTEX_UNLOCK (queue);
gst_queue2_post_buffering (queue);
if (gst_pad_check_reconfigure (queue->srcpad)) {
/* If the pad was reconfigured, do a new bitrate query */
query_downstream_bitrate (queue);
}
if (item_type == GST_QUEUE2_ITEM_TYPE_BUFFER) {
GstBuffer *buffer;
@ -3274,6 +3288,10 @@ gst_queue2_handle_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
GST_QUEUE2_MUTEX_LOCK (queue);
/* assume downstream is linked now and try to push again */
if (queue->srcresult == GST_FLOW_NOT_LINKED) {
/* Mark the pad as needing reconfiguration, and
* the loop will re-query downstream bitrate
*/
gst_pad_mark_reconfigure (pad);
queue->srcresult = GST_FLOW_OK;
queue->sinkresult = GST_FLOW_OK;
if (GST_PAD_MODE (pad) == GST_PAD_MODE_PUSH) {
@ -3284,9 +3302,6 @@ gst_queue2_handle_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
}
GST_QUEUE2_MUTEX_UNLOCK (queue);
/* force a new bitrate query to be performed */
query_downstream_bitrate (queue);
res = gst_pad_push_event (queue->sinkpad, event);
break;
default:
@ -3787,7 +3802,10 @@ gst_queue2_change_state (GstElement * element, GstStateChange transition)
queue->starting_segment = NULL;
gst_event_replace (&queue->stream_start_event, NULL);
GST_QUEUE2_MUTEX_UNLOCK (queue);
query_downstream_bitrate (queue);
/* Mark the srcpad as reconfigured to trigger querying
* the downstream bitrate next time it tries to push */
gst_pad_mark_reconfigure (queue->srcpad);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
break;