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identity: With sync=true, don't pre-roll

Browse source 
To act like a real live element, block the streaming when paused, and
return NO_PREROLL.

https://bugzilla.gnome.org/show_bug.cgi?id=601853
This commit is contained in:
Olivier Crête 2015-04-20 19:31:37 -04:00
parent 7807296afd
commit 5ea338907c
2 changed files with 27 additions and 0 deletions
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25
plugins/elements/gstidentity.c
View file

@ -127,6 +127,7 @@ gst_identity_finalize (GObject * object)
identity = GST_IDENTITY (object);
g_free (identity->last_message);
g_cond_clear (&identity->blocked_cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
@ -259,6 +260,7 @@ gst_identity_init (GstIdentity * identity)
identity->dump = DEFAULT_DUMP;
identity->last_message = NULL;
identity->signal_handoffs = DEFAULT_SIGNAL_HANDOFFS;
g_cond_init (&identity->blocked_cond);
gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM_CAST (identity), TRUE);
}
@ -568,6 +570,11 @@ gst_identity_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
GstClock *clock;
GST_OBJECT_LOCK (identity);
while (identity->blocked)
g_cond_wait (&identity->blocked_cond, GST_OBJECT_GET_LOCK (identity));
if ((clock = GST_ELEMENT (identity)->clock)) {
GstClockReturn cret;
GstClockTime timestamp;
@ -840,13 +847,23 @@ gst_identity_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstIdentity *identity = GST_IDENTITY (element);
gboolean no_preroll = FALSE;
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_OBJECT_LOCK (identity);
identity->blocked = TRUE;
GST_OBJECT_UNLOCK (identity);
if (identity->sync)
no_preroll = TRUE;
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_OBJECT_LOCK (identity);
identity->blocked = FALSE;
g_cond_broadcast (&identity->blocked_cond);
GST_OBJECT_UNLOCK (identity);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_OBJECT_LOCK (identity);
@ -856,6 +873,8 @@ gst_identity_change_state (GstElement * element, GstStateChange transition)
gst_clock_id_unref (identity->clock_id);
identity->clock_id = NULL;
}
identity->blocked = FALSE;
g_cond_broadcast (&identity->blocked_cond);
GST_OBJECT_UNLOCK (identity);
break;
default:
@ -868,7 +887,10 @@ gst_identity_change_state (GstElement * element, GstStateChange transition)
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_OBJECT_LOCK (identity);
identity->upstream_latency = 0;
identity->blocked = TRUE;
GST_OBJECT_UNLOCK (identity);
if (identity->sync)
no_preroll = TRUE;
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
break;
@ -878,5 +900,8 @@ gst_identity_change_state (GstElement * element, GstStateChange transition)
break;
}
if (no_preroll && ret == GST_STATE_CHANGE_SUCCESS)
ret = GST_STATE_CHANGE_NO_PREROLL;
return ret;
}

2
plugins/elements/gstidentity.h
View file

@ -73,6 +73,8 @@ struct _GstIdentity {
guint64 offset;
gboolean signal_handoffs;
GstClockTime upstream_latency;
GCond blocked_cond;
gboolean blocked;
};
struct _GstIdentityClass {