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queue: Fix handling of min-threshold and serialized queries

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Only consider the queue empty if the minimum thresholds
are not reached and data is at the queue head. Otherwise
we would block forever on serialized queries.

This also makes sending of serialized events, like caps, happen
faster and potentially improves negotiation performance.

Fixes bug #679458.
This commit is contained in:
Sebastian Dröge 2012-07-09 15:37:28 +02:00
parent f6e8786be8
commit af73f3fc02
1 changed files with 10 additions and 0 deletions
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10
plugins/elements/gstqueue.c
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@ -821,9 +821,19 @@ out_flushing:
static gboolean
gst_queue_is_empty (GstQueue * queue)
{
GstMiniObject *head;
if (queue->queue->length == 0)
return TRUE;
/* Only consider the queue empty if the minimum thresholds
* are not reached and data is at the queue head. Otherwise
* we would block forever on serialized queries.
*/
head = queue->queue->array[queue->queue->head];
if (!GST_IS_BUFFER (head) && !GST_IS_BUFFER_LIST (head))
return FALSE;
/* It is possible that a max size is reached before all min thresholds are.
* Therefore, only consider it empty if it is not filled. */
return ((queue->min_threshold.buffers > 0 &&