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96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/* GStreamer
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* Copyright (C) 2011 Collabora Ltd.
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* Copyright (C) 2011 Intel
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*
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* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstsurfacemeta.h"
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/**
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* SECTION:gstsurfacemeta
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* @short_description: Accelerated surface metadata
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*
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* This meta data is used to abstract hardware accelerated buffers and enable
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* generic convertion to standard type such as GL textures. The media type for
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* those buffers is defined by #GST_VIDEO_CAPS_SURFACE. An implementation
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* specific type must be set using the "type" key (e.g. type="vaapi").
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* Available convertion type are speficied using seperate boolean
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* arguement (e.g. opengl=true). Having this information in the capabilities
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* allow easy negotiating of such feature with other elements (e.g. a
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* ClutterGstVideoSink can claim accpeting caps "video/x-surface,opengl=true").
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* <note>
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* The GstSurfaceMeta interface is unstable API and may change in future.
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* One can define GST_USE_UNSTABLE_API to acknowledge and avoid this warning.
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* </note>
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*/
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GType
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gst_surface_meta_api_get_type (void)
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{
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static volatile GType type;
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static const gchar *tags[] = { "memory", NULL };
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if (g_once_init_enter (&type)) {
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GType _type = gst_meta_api_type_register ("GstSurfaceMetaAPI", tags);
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g_once_init_leave (&type, _type);
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}
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return type;
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}
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const GstMetaInfo *
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gst_surface_meta_get_info (void)
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{
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static const GstMetaInfo *meta_info = NULL;
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if (g_once_init_enter (&meta_info)) {
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const GstMetaInfo *meta =
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gst_meta_register (GST_SURFACE_META_API_TYPE, "GstSurfaceMeta",
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sizeof (GstSurfaceMeta),
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(GstMetaInitFunction) NULL,
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(GstMetaFreeFunction) NULL, (GstMetaTransformFunction) NULL);
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g_once_init_leave (&meta_info, meta);
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}
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return meta_info;
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}
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/**
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* gst_surface_meta_create_converter:
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* @meta: a #GstSurfaceMeta
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* @type: the type to convert to
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* @dest: a #GValue containing the destination to upload
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*
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* This method is used to create a type specific converter. The converter will
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* serve as context to accelerate the data convertion. This converter object
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* shall be discarded when the pipeline state changes to NULL and renewed when
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* caps are changed.
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*
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* Returns: newly allocated #GstSurfaceConverter
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*/
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GstSurfaceConverter *
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gst_surface_meta_create_converter (GstSurfaceMeta * meta,
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const gchar * type, GValue * dest)
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{
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g_return_val_if_fail (meta != NULL, FALSE);
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return meta->create_converter (meta, type, dest);
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}
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