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aggregator: Add create_new_pad() vfunc to allow subclasses to override the default behaviour

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Not all aggregator subclasses will have a single pad template called sink_%u
and might do something special depending on what the application requests.

https://bugzilla.gnome.org/show_bug.cgi?id=757018
This commit is contained in:
Sebastian Dröge 2015-10-23 15:42:24 +03:00 committed by Tim-Philipp Müller
parent 41b4a78b6b
commit bbd11aea40
2 changed files with 32 additions and 10 deletions
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37
libs/gst/base/gstaggregator.c
View file

@ -1308,23 +1308,19 @@ gst_aggregator_release_pad (GstElement * element, GstPad * pad)
SRC_UNLOCK (self);
}
static GstPad *
gst_aggregator_request_new_pad (GstElement * element,
static GstAggregatorPad *
gst_aggregator_default_create_new_pad (GstAggregator * self,
GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
{
GstAggregator *self;
GstAggregatorPad *agg_pad;
GstElementClass *klass = GST_ELEMENT_GET_CLASS (element);
GstAggregatorPrivate *priv = GST_AGGREGATOR (element)->priv;
self = GST_AGGREGATOR (element);
GstElementClass *klass = GST_ELEMENT_GET_CLASS (self);
GstAggregatorPrivate *priv = self->priv;
if (templ == gst_element_class_get_pad_template (klass, "sink_%u")) {
gint serial = 0;
gchar *name = NULL;
GST_OBJECT_LOCK (element);
GST_OBJECT_LOCK (self);
if (req_name == NULL || strlen (req_name) < 6
|| !g_str_has_prefix (req_name, "sink_")) {
/* no name given when requesting the pad, use next available int */
@ -1341,11 +1337,30 @@ gst_aggregator_request_new_pad (GstElement * element,
"name", name, "direction", GST_PAD_SINK, "template", templ, NULL);
g_free (name);
GST_OBJECT_UNLOCK (element);
GST_OBJECT_UNLOCK (self);
return agg_pad;
} else {
return NULL;
}
}
static GstPad *
gst_aggregator_request_new_pad (GstElement * element,
GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
{
GstAggregator *self;
GstAggregatorPad *agg_pad;
GstAggregatorClass *klass = GST_AGGREGATOR_GET_CLASS (element);
GstAggregatorPrivate *priv = GST_AGGREGATOR (element)->priv;
self = GST_AGGREGATOR (element);
agg_pad = klass->create_new_pad (self, templ, req_name, caps);
if (!agg_pad) {
GST_ERROR_OBJECT (element, "Couldn't create new pad");
return NULL;
}
GST_DEBUG_OBJECT (element, "Adding pad %s", GST_PAD_NAME (agg_pad));
self->priv->has_peer_latency = FALSE;
@ -1949,6 +1964,8 @@ gst_aggregator_class_init (GstAggregatorClass * klass)
klass->src_event = gst_aggregator_default_src_event;
klass->src_query = gst_aggregator_default_src_query;
klass->create_new_pad = gst_aggregator_default_create_new_pad;
gstelement_class->request_new_pad =
GST_DEBUG_FUNCPTR (gst_aggregator_request_new_pad);
gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_aggregator_send_event);

5
libs/gst/base/gstaggregator.h
View file

@ -245,6 +245,11 @@ struct _GstAggregatorClass {
GstClockTime (*get_next_time) (GstAggregator * aggregator);
GstAggregatorPad * (*create_new_pad) (GstAggregator * self,
GstPadTemplate * templ,
const gchar * req_name,
const GstCaps * caps);
/*< private >*/
gpointer _gst_reserved[GST_PADDING_LARGE];
};