82 lines
3.3 KiB
C
82 lines
3.3 KiB
C
/* GStreamer
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* Copyright (C) Collabora Ltd.
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* Author: Matthieu Bouron <matthieu.bouron@collabora.com>
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* Copyright (C) 2015, Matthew Waters <matthew@centricular.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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#ifndef __GST_VIDEO_AFFINE_TRANSFORMATION_META_H__
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#define __GST_VIDEO_AFFINE_TRANSFORMATION_META_H__
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#include <gst/gst.h>
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#include <gst/video/video.h>
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G_BEGIN_DECLS
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#define GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE (gst_video_affine_transformation_meta_api_get_type())
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#define GST_VIDEO_AFFINE_TRANSFORMATION_META_INFO (gst_video_affine_transformation_meta_get_info())
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typedef struct _GstVideoAffineTransformationMeta GstVideoAffineTransformationMeta;
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typedef gboolean (*GstVideoAffineTransformationGetMatrix) (GstVideoAffineTransformationMeta * meta, gfloat * matrix);
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#define GST_CAPS_FEATURE_META_GST_VIDEO_AFFINE_TRANSFORMATION_META "meta:GstVideoAffineTransformation"
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#define GST_BUFFER_POOL_OPTION_VIDEO_AFFINE_TRANSFORMATION_META "GstBufferPoolOptionVideoAffineTransformation"
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/**
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* GstVideoAffineTransformationMeta:
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* @meta: parent #GstMeta
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* @matrix: the column-major 4x4 transformation matrix
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*
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* Extra buffer metadata for performing an affine transformation using a 4x4
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* matrix. The transformation matrix can be composed with
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* gst_video_affine_transformation_meta_apply_matrix().
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*
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* The vertices operated on are all in the range 0 to 1, not in
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* Normalized Device Coordinates (-1 to +1). Transforming points in this space
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* are assumed to have an origin at (0.5, 0.5, 0.5) in a left-handed coordinate
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* system with the x-axis moving horizontally (positive values to the right),
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* the y-axis moving vertically (positive values up the screen) and the z-axis
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* perpendicular to the screen (positive values into the screen).
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*
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* Since: 1.8
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*/
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struct _GstVideoAffineTransformationMeta
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{
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GstMeta meta;
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gfloat matrix[16];
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};
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GST_VIDEO_API
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GType gst_video_affine_transformation_meta_api_get_type (void);
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GST_VIDEO_API
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const GstMetaInfo *gst_video_affine_transformation_meta_get_info (void);
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#define gst_buffer_get_video_affine_transformation_meta(b) \
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((GstVideoAffineTransformationMeta *)gst_buffer_get_meta((b),GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE))
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GST_VIDEO_API
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GstVideoAffineTransformationMeta *gst_buffer_add_video_affine_transformation_meta (GstBuffer * buffer);
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GST_VIDEO_API
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void gst_video_affine_transformation_meta_apply_matrix (GstVideoAffineTransformationMeta * meta,
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const gfloat matrix[16]);
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G_END_DECLS
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#endif /* __GST_VIDEO_AFFINE_TRANSFORMATION_META_H__ */
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