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BaseTransform: Add a query vfunc

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This commit is contained in:
Sjoerd Simons 2011-08-25 11:02:16 +01:00 committed by Sebastian Dröge
parent 341d7a4c0d
commit 63a21ca8b1
2 changed files with 33 additions and 6 deletions
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32
libs/gst/base/gstbasetransform.c
View file

@ -350,6 +350,8 @@ static gboolean gst_base_transform_setcaps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_base_transform_buffer_alloc (GstPad * pad,
guint64 offset, guint size, GstCaps * caps, GstBuffer ** buf);
static gboolean gst_base_transform_query (GstPad * pad, GstQuery * query);
static gboolean gst_base_transform_default_query (GstBaseTransform * trans,
GstPad * pad, GstQuery * query);
static const GstQueryType *gst_base_transform_query_type (GstPad * pad);
/* static guint gst_base_transform_signals[LAST_SIGNAL] = { 0 }; */
@ -397,6 +399,7 @@ gst_base_transform_class_init (GstBaseTransformClass * klass)
klass->src_event = GST_DEBUG_FUNCPTR (gst_base_transform_src_eventfunc);
klass->accept_caps =
GST_DEBUG_FUNCPTR (gst_base_transform_acceptcaps_default);
klass->query = GST_DEBUG_FUNCPTR (gst_base_transform_default_query);
}
static void
@ -1234,15 +1237,12 @@ failed_configure:
}
static gboolean
gst_base_transform_query (GstPad * pad, GstQuery * query)
gst_base_transform_default_query (GstBaseTransform * trans,
GstPad * pad, GstQuery * query)
{
gboolean ret = FALSE;
GstBaseTransform *trans;
GstPad *otherpad;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
if (G_UNLIKELY (trans == NULL))
return FALSE;
otherpad = (pad == trans->srcpad) ? trans->sinkpad : trans->srcpad;
switch (GST_QUERY_TYPE (query)) {
@ -1274,7 +1274,29 @@ gst_base_transform_query (GstPad * pad, GstQuery * query)
break;
}
return ret;
}
static gboolean
gst_base_transform_query (GstPad * pad, GstQuery * query)
{
GstBaseTransform *trans;
GstBaseTransformClass *bclass;
gboolean ret;
trans = GST_BASE_TRANSFORM (gst_pad_get_parent (pad));
if (G_UNLIKELY (trans == NULL))
return FALSE;
bclass = GST_BASE_TRANSFORM_GET_CLASS (trans);
if (bclass->query)
ret = bclass->query (trans, pad, query);
else
ret = gst_pad_query_default (pad, query);
gst_object_unref (trans);
return ret;
}

7
libs/gst/base/gstbasetransform.h
View file

@ -190,6 +190,10 @@ struct _GstBaseTransform {
* Subclasses can override this method to check if @caps can be
* handled by the element. The default implementation might not be
* the most optimal way to check this in all cases.
* @query: Optional Since 0.10.36
* Handle a requested query. Subclasses that implement this
* should must chain up to the parent if they didn't handle the
* query
*
* Subclasses can override any of the available virtual methods or not, as
* needed. At minimum either @transform or @transform_ip need to be overridden.
@ -243,9 +247,10 @@ struct _GstBaseTransformClass {
gboolean (*accept_caps) (GstBaseTransform *trans, GstPadDirection direction,
GstCaps *caps);
gboolean (*query) (GstBaseTransform *trans, GstPad *pad, GstQuery *query);
/*< private >*/
gpointer _gst_reserved[GST_PADDING_LARGE - 3];
gpointer _gst_reserved[GST_PADDING_LARGE - 4];
};
GType gst_base_transform_get_type (void);