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/* GStreamer
* Copyright (C) 2011 Collabora Ltd.
* Copyright (C) 2011 Intel
*
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstsurfacebuffer.h"
/**
* SECTION:gstsurfacebuffer
* @short_description: Accelerated surface base class
*
* This base class is used to abstract hardware accelerated buffers and enable
* generic conversion to standard types such as GL textures. The media type for
* those buffers is defined by #GST_VIDEO_CAPS_SURFACE. An implementation
* specific type must be set using the "type" key (e.g. type="vaapi").
* Available conversion types are specified using separate boolean
* arguments (e.g. opengl=true). Having this information in the capabilities
* allows easy negotiating of such features with other elements (e.g. a
* ClutterGstVideoSink can claim accpeting caps "video/x-surface,opengl=true").
* <note>
* The GstVideoContext interface is unstable API and may change in future.
* One can define GST_USE_UNSTABLE_API to acknowledge and avoid this warning.
* </note>
*/
G_DEFINE_TYPE (GstSurfaceBuffer, gst_surface_buffer, GST_TYPE_BUFFER);
static GstSurfaceConverter *
gst_surface_buffer_default_create_converter (GstSurfaceBuffer * surface,
const gchar * type, GValue * dest)
{
return NULL;
}
static void
gst_surface_buffer_class_init (GstSurfaceBufferClass * klass)
{
klass->create_converter = gst_surface_buffer_default_create_converter;
}
static void
gst_surface_buffer_init (GstSurfaceBuffer * surface)
{
/* Nothing to do */
}
/**
* gst_surface_buffer_create_converter:
* @buffer: a #GstSurfaceBuffer
* @type: the type to convert to
* @dest: a #GValue containing the destination to upload
*
* This method is used to create a type specific converter. The converter will
* serve as context to accelerate the data conversion. This converter object
* shall be discarded when the pipeline state changes to #GST_STATE_NULL and
* renewed when caps are changed.
*
* Returns: a newly allocated #GstSurfaceConverter
*/
GstSurfaceConverter *
gst_surface_buffer_create_converter (GstSurfaceBuffer * buffer,
const gchar * type, GValue * dest)
{
g_return_val_if_fail (GST_IS_SURFACE_BUFFER (buffer), FALSE);
return GST_SURFACE_BUFFER_GET_CLASS (buffer)->create_converter (buffer,
type, dest);
}
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