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queue2: Post buffering messages earlier in ringbuffer mode

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In ringbuffer mode we need to make sure we post buffering messages *before*
blocking to wait for data to be drained.

Without this, we would end up in situations like this:
* pipeline is pre-rolling
* Downstream demuxer/decoder has pushed data to all sinks, and demuxer thread
  is blocking downstream (i.e. not pulling from upstream/queue2).
* Therefore pipeline has pre-rolled ...
* ... but queue2 hasn't filled up yet, therefore the application waits for
  the buffering 100% messages before setting the pipeline to PLAYING
* But queue2 can't post that message, since the 100% message will be posted
  *after* there is room available for that last buffer.

https://bugzilla.gnome.org/show_bug.cgi?id=769802
This commit is contained in:
Edward Hervey 2016-08-12 16:15:25 +02:00 committed by Edward Hervey
parent 5f021759b3
commit 5154dcfbdc
1 changed files with 27 additions and 5 deletions
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32
plugins/elements/gstqueue2.c
View file

@ -275,6 +275,7 @@ static gboolean gst_queue2_is_filled (GstQueue2 * queue);
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);
static void gst_queue2_post_buffering (GstQueue2 * queue);
typedef enum
@ -1002,13 +1003,12 @@ get_buffering_stats (GstQueue2 * queue, gint percent, GstBufferingMode * mode,
}
}
static void
gst_queue2_post_buffering (GstQueue2 * queue)
/* Called with the lock taken */
static GstMessage *
gst_queue2_get_buffering_message (GstQueue2 * queue)
{
GstMessage *msg = NULL;
g_mutex_lock (&queue->buffering_post_lock);
GST_QUEUE2_MUTEX_LOCK (queue);
if (queue->percent_changed) {
gint percent = queue->buffering_percent;
@ -1020,6 +1020,18 @@ gst_queue2_post_buffering (GstQueue2 * queue)
gst_message_set_buffering_stats (msg, queue->mode, queue->avg_in,
queue->avg_out, queue->buffering_left);
}
return msg;
}
static void
gst_queue2_post_buffering (GstQueue2 * queue)
{
GstMessage *msg = NULL;
g_mutex_lock (&queue->buffering_post_lock);
GST_QUEUE2_MUTEX_LOCK (queue);
msg = gst_queue2_get_buffering_message (queue);
GST_QUEUE2_MUTEX_UNLOCK (queue);
if (msg != NULL)
@ -2028,8 +2040,18 @@ gst_queue2_create_write (GstQueue2 * queue, GstBuffer * buffer)
update_cur_level (queue, queue->current);
/* update the buffering status */
if (queue->use_buffering)
if (queue->use_buffering) {
GstMessage *msg;
update_buffering (queue);
msg = gst_queue2_get_buffering_message (queue);
if (msg) {
GST_QUEUE2_MUTEX_UNLOCK (queue);
g_mutex_lock (&queue->buffering_post_lock);
gst_element_post_message (GST_ELEMENT_CAST (queue), msg);
g_mutex_unlock (&queue->buffering_post_lock);
GST_QUEUE2_MUTEX_LOCK (queue);
}
}
GST_INFO_OBJECT (queue, "cur_level.bytes %u (max %" G_GUINT64_FORMAT ")",
queue->cur_level.bytes, QUEUE_MAX_BYTES (queue));