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/*
* gstvaapivideosink.c - VA sink interface
*
* gstreamer-vaapi (C) 2010-2011 Splitted-Desktop Systems
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:gstvaapivideosink
* @short_description: An interface for implementing VA-API sink elements
*/
#include "config.h"
#include "gstvaapivideosink.h"
static void
gst_vaapi_video_sink_base_init(gpointer g_class)
{
static gboolean is_initialized = FALSE;
if (!is_initialized) {
is_initialized = TRUE;
}
}
GType
gst_vaapi_video_sink_get_type(void)
{
static GType iface_type = 0;
if (G_UNLIKELY(!iface_type)) {
static const GTypeInfo info = {
sizeof(GstVaapiVideoSinkInterface),
gst_vaapi_video_sink_base_init, /* base_init */
NULL, /* base_finalize */
};
iface_type = g_type_register_static(
G_TYPE_INTERFACE,
"GstVaapiVideoSink",
&info,
0
);
}
return iface_type;
}
/**
* gst_vaapi_video_sink_get_display:
* @sink: a #GstElement
*
* Returns the #GstVaapiDisplay created by the VA-API @sink element.
*
* Return value: the #GstVaapiDisplay created by the @sink element
*/
GstVaapiDisplay *
gst_vaapi_video_sink_get_display(GstVaapiVideoSink *sink)
{
g_return_val_if_fail(GST_VAAPI_IS_VIDEO_SINK(sink), NULL);
return GST_VAAPI_VIDEO_SINK_GET_INTERFACE(sink)->get_display(sink);
}
/**
* gst_vaapi_video_sink_lookup:
* @element: a #GstElement
*
* Traverses the whole downstream elements chain and finds a suitable
* #GstVaapiDisplay. This is a helper function for intermediate VA-API
* elements that don't create a #GstVaapiDisplay but require one.
* e.g. the `vaapiconvert' element.
*
* Return value: the #GstVaapiDisplay created by a downstream sink
* element, or %NULL if none was found
*/
GstVaapiVideoSink *
gst_vaapi_video_sink_lookup(GstElement *element)
{
GstVaapiVideoSink *sink = NULL;
GstPad *pad, *peer;
g_return_val_if_fail(GST_IS_ELEMENT(element), NULL);
while (!sink) {
pad = gst_element_get_static_pad(element, "src");
if (!pad)
break;
peer = gst_pad_get_peer(pad);
g_object_unref(pad);
if (!peer)
break;
element = gst_pad_get_parent_element(peer);
g_object_unref(peer);
if (!element)
break;
if (GST_VAAPI_IS_VIDEO_SINK(element))
sink = GST_VAAPI_VIDEO_SINK(element);
g_object_unref(element);
}
return sink;
}
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