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ringbuffer: Improve audiosink startup performance

Browse source 
When we start the ringbuffer, immediatly continue processing samples if the
writer prepared some for us.

Fixes #545807
This commit is contained in:
Eero Nurkkala 2009-08-24 13:27:55 +02:00 committed by Wim Taymans
parent 066f9be5c9
commit 8ad8591e41
1 changed files with 19 additions and 8 deletions
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27
gst-libs/gst/audio/gstringbuffer.c
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@ -1399,6 +1399,9 @@ gst_ring_buffer_clear_all (GstRingBuffer * buf)
static gboolean
wait_segment (GstRingBuffer * buf)
{
gint segments;
gboolean wait = TRUE;
/* buffer must be started now or we deadlock since nobody is reading */
if (G_UNLIKELY (g_atomic_int_get (&buf->state) !=
GST_RING_BUFFER_STATE_STARTED)) {
@ -1407,7 +1410,13 @@ wait_segment (GstRingBuffer * buf)
goto no_start;
GST_DEBUG_OBJECT (buf, "start!");
segments = g_atomic_int_get (&buf->segdone);
gst_ring_buffer_start (buf);
/* After starting, the writer may have wrote segments already and then we
* don't need to wait anymore */
if (G_LIKELY (g_atomic_int_get (&buf->segdone) != segments))
wait = FALSE;
}
/* take lock first, then update our waiting flag */
@ -1419,16 +1428,18 @@ wait_segment (GstRingBuffer * buf)
GST_RING_BUFFER_STATE_STARTED))
goto not_started;
if (g_atomic_int_compare_and_exchange (&buf->waiting, 0, 1)) {
GST_DEBUG_OBJECT (buf, "waiting..");
GST_RING_BUFFER_WAIT (buf);
if (G_LIKELY (wait)) {
if (g_atomic_int_compare_and_exchange (&buf->waiting, 0, 1)) {
GST_DEBUG_OBJECT (buf, "waiting..");
GST_RING_BUFFER_WAIT (buf);
if (G_UNLIKELY (buf->abidata.ABI.flushing))
goto flushing;
if (G_UNLIKELY (buf->abidata.ABI.flushing))
goto flushing;
if (G_UNLIKELY (g_atomic_int_get (&buf->state) !=
GST_RING_BUFFER_STATE_STARTED))
goto not_started;
if (G_UNLIKELY (g_atomic_int_get (&buf->state) !=
GST_RING_BUFFER_STATE_STARTED))
goto not_started;
}
}
GST_OBJECT_UNLOCK (buf);