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videometa: add GstVideoAffineTransformationMeta

Browse source 
Adds a simple 4x4 affine transformations meta for passing arbitrary
transformations on buffers.

Based on patch by Matthieu Bouron

https://bugzilla.gnome.org/show_bug.cgi?id=731791
This commit is contained in:
Matthew Waters 2015-11-02 23:12:19 +11:00
parent ff6d1a2a25
commit 0b98ed32ce
6 changed files with 241 additions and 0 deletions
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1
docs/libs/gst-plugins-base-libs-docs.sgml
View file

@ -197,6 +197,7 @@
</para>
<xi:include href="xml/gstvideo.xml" />
<xi:include href="xml/gstvideometa.xml" />
<xi:include href="xml/gstvideoaffinetransformationmeta.xml" />
<xi:include href="xml/gstvideooverlaycomposition.xml" />
<xi:include href="xml/gstvideofilter.xml" />
<xi:include href="xml/gstvideodither.xml" />

12
docs/libs/gst-plugins-base-libs-sections.txt
View file

@ -2625,6 +2625,18 @@ gst_video_gl_texture_upload_meta_api_get_type
gst_video_gl_texture_upload_meta_get_info
</SECTION>
<SECTION>
<FILE>gstvideoaffinetransformationmeta</FILE>
<INCLUDE>gst/video/gstvideoaffinetransformationmeta.h</INCLUDE>
GstVideoAffineTransformationMeta
gst_buffer_add_video_affine_transformation_meta
gst_buffer_get_video_affine_transformation_meta
gst_video_affine_transformation_meta_apply_matrix
<SUBSECTION Standard>
gst_video_affine_transformation_meta_api_get_type
gst_video_affine_transformation_meta_get_info
</SECTION>
<SECTION>
<FILE>gstvideooverlaycomposition</FILE>
<INCLUDE>gst/video/video-overlay-composition.h</INCLUDE>

2
gst-libs/gst/video/Makefile.am
View file

@ -35,6 +35,7 @@ libgstvideo_@GST_API_VERSION@_la_SOURCES = \
gstvideosink.c \
gstvideofilter.c \
convertframe.c \
gstvideoaffinetransformationmeta.c \
gstvideometa.c \
gstvideopool.c \
videoorientation.c \
@ -69,6 +70,7 @@ libgstvideo_@GST_API_VERSION@include_HEADERS = \
gstvideosink.h \
gstvideofilter.h \
gstvideometa.h \
gstvideoaffinetransformationmeta.h \
gstvideopool.h \
videoorientation.h \
videooverlay.h \

152
gst-libs/gst/video/gstvideoaffinetransformationmeta.c Normal file
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@ -0,0 +1,152 @@
/* GStreamer
* Copyright (C) <2014> Collabora Ltd.
* Author: Matthieu Bouron <matthieu.bouron@gmail.com>
* Copyright (C) 2015, Matthew Waters <matthew@centricular.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "gstvideoaffinetransformationmeta.h"
#include <string.h>
GType
gst_video_affine_transformation_meta_api_get_type (void)
{
static volatile GType type = 0;
static const gchar *tags[] =
{ GST_META_TAG_VIDEO_STR, GST_META_TAG_VIDEO_ORIENTATION_STR,
GST_META_TAG_VIDEO_ORIENTATION_STR, NULL
};
if (g_once_init_enter (&type)) {
GType _type =
gst_meta_api_type_register ("GstVideoAffineTransformationAPI", tags);
g_once_init_leave (&type, _type);
}
return type;
}
static gboolean
gst_video_affine_transformation_meta_transform (GstBuffer * dest,
GstMeta * meta, GstBuffer * buffer, GQuark type, gpointer data)
{
GstVideoAffineTransformationMeta *dmeta, *smeta;
smeta = (GstVideoAffineTransformationMeta *) meta;
if (GST_META_TRANSFORM_IS_COPY (type)) {
dmeta =
(GstVideoAffineTransformationMeta *) gst_buffer_add_meta (dest,
GST_VIDEO_AFFINE_TRANSFORMATION_META_INFO, NULL);
if (!dmeta)
return FALSE;
memcpy (dmeta->matrix, smeta->matrix, sizeof (dmeta->matrix[0]) * 16);
}
return TRUE;
}
static gboolean
gst_video_affine_transformation_meta_init (GstMeta * meta, gpointer params,
GstBuffer * buffer)
{
GstVideoAffineTransformationMeta *af_meta =
(GstVideoAffineTransformationMeta *) meta;
gfloat matrix[] = {
1.0f, 0.0f, 0.0f, 0.0f,
0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f
};
memcpy (af_meta->matrix, matrix, sizeof (matrix[0]) * 16);
return TRUE;
}
const GstMetaInfo *
gst_video_affine_transformation_meta_get_info (void)
{
static const GstMetaInfo *info = NULL;
if (g_once_init_enter (&info)) {
const GstMetaInfo *meta =
gst_meta_register (GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE,
"GstVideoAffineTransformationMeta",
sizeof (GstVideoAffineTransformationMeta),
gst_video_affine_transformation_meta_init,
NULL,
gst_video_affine_transformation_meta_transform);
g_once_init_leave (&info, meta);
}
return info;
}
/**
* gst_buffer_add_video_affine_transformation_meta
* @buffer: a #GstBuffer
*
* Attaches GstVideoAffineTransformationMeta metadata to @buffer with
* the given parameters.
*
* Returns: the #GstVideoAffineTransformationMeta on @buffer.
*
* Since: 1.8
*/
GstVideoAffineTransformationMeta *
gst_buffer_add_video_affine_transformation_meta (GstBuffer * buffer)
{
GstVideoAffineTransformationMeta *meta;
g_return_val_if_fail (buffer != NULL, NULL);
meta =
(GstVideoAffineTransformationMeta *) gst_buffer_add_meta (buffer,
GST_VIDEO_AFFINE_TRANSFORMATION_META_INFO, NULL);
if (!meta)
return NULL;
return meta;
}
/**
* gst_video_affine_transformation_meta_apply_matrix:
* @meta: a #GstVideoAffineTransformationMeta
* @matrix: a 4x4 transformation matrix to be applied
*
* Apply a transformation using the given 4x4 transformation matrix
*
* Since: 1.8
*/
void gst_video_affine_transformation_meta_apply_matrix
(GstVideoAffineTransformationMeta * meta, const gfloat matrix[16])
{
gfloat res[16] = { 0.0f };
int i, j, k;
for (i = 0; i < 4; i++) {
for (j = 0; j < 4; j++) {
for (k = 0; k < 4; k++) {
res[i + (j * 4)] += meta->matrix[i + (k * 4)] * matrix[k + (j * 4)];
}
}
}
memcpy (meta->matrix, res, sizeof (meta->matrix[0]) * 16);
}

70
gst-libs/gst/video/gstvideoaffinetransformationmeta.h Normal file
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@ -0,0 +1,70 @@
/* GStreamer
* Copyright (C) Collabora Ltd.
* Author: Matthieu Bouron <matthieu.bouron@collabora.com>
* Copyright (C) 2015, Matthew Waters <matthew@centricular.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_VIDEO_AFFINE_TRANSFORMATION_META_H__
#define __GST_VIDEO_AFFINE_TRANSFORMATION_META_H__
#include <gst/gst.h>
#include <gst/video/video.h>
G_BEGIN_DECLS
#define GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE (gst_video_affine_transformation_meta_api_get_type())
#define GST_VIDEO_AFFINE_TRANSFORMATION_META_INFO (gst_video_affine_transformation_meta_get_info())
typedef struct _GstVideoAffineTransformationMeta GstVideoAffineTransformationMeta;
typedef gboolean (*GstVideoAffineTransformationGetMatrix) (GstVideoAffineTransformationMeta * meta, gfloat * matrix);
#define GST_CAPS_FEATURE_META_GST_VIDEO_AFFINE_TRANSFORMATION_META "meta:GstVideoAffineTransformation"
#define GST_BUFFER_POOL_OPTION_VIDEO_AFFINE_TRANSFORMATION_META "GstBufferPoolOptionVideoAffineTransformation"
/**
* GstVideoAffineTransformation:
* @meta: parent #GstMeta
* @matrix: the column-major 4x4 transformation matrix
*
* Extra buffer metadata for performing an affine transformation using a 4x4
* matrix. The transformation matrix can be composed with
* gst_video_affine_transformation_meta_apply_matrix().
*
* Since: 1.8
*/
struct _GstVideoAffineTransformationMeta
{
GstMeta meta;
gfloat matrix[16];
};
GType gst_video_affine_transformation_meta_api_get_type (void);
const GstMetaInfo *gst_video_affine_transformation_meta_get_info (void);
#define gst_buffer_get_video_affine_transformation_meta(b) \
((GstVideoAffineTransformationMeta *)gst_buffer_get_meta((b),GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE))
GstVideoAffineTransformationMeta *gst_buffer_add_video_affine_transformation_meta (GstBuffer * buffer);
void gst_video_affine_transformation_meta_apply_matrix (GstVideoAffineTransformationMeta * meta,
const gfloat matrix[16]);
G_END_DECLS
#endif /* __GST_VIDEO_AFFINE_TRANSFORMATION_META_H__ */

4
win32/common/libgstvideo.def
View file

@ -1,5 +1,6 @@
EXPORTS
_gst_video_decoder_error
gst_buffer_add_video_affine_transformation_meta
gst_buffer_add_video_gl_texture_upload_meta
gst_buffer_add_video_meta
gst_buffer_add_video_meta_full
@ -51,6 +52,9 @@ EXPORTS
gst_navigation_send_event
gst_navigation_send_key_event
gst_navigation_send_mouse_event
gst_video_affine_transformation_meta_api_get_type
gst_video_affine_transformation_meta_apply_matrix
gst_video_affine_transformation_meta_get_info
gst_video_alignment_reset
gst_video_alpha_mode_get_type
gst_video_blend