gstreamer/gst-libs/gst/video/gstvideoaffinetransformationmeta.c
Matthew Waters 98249a57db gst: don't use volatile to mean atomic
volatile is not sufficient to provide atomic guarantees and real atomics
should be used instead.  GCC 11 has started warning about using volatile
with atomic operations.

https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719

Discovered in https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/868

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1073>
2021-03-19 04:20:19 +00:00

163 lines
4.5 KiB
C

/* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstvideoaffinetransformationmeta.h"
#include <string.h>
/**
* SECTION:gstvideoaffinetransformationmeta
* @title: GstVideoAffineTransformationMeta
* @short_description: GstMeta for video affine transformation
*
*/
GType
gst_video_affine_transformation_meta_api_get_type (void)
{
static 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 ((GstMetaInfo **) & 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 ((GstMetaInfo **) & info, (GstMetaInfo *) meta);
}
return info;
}
/**
* gst_buffer_add_video_affine_transformation_meta:
* @buffer: a #GstBuffer
*
* Attaches GstVideoAffineTransformationMeta metadata to @buffer with
* the given parameters.
*
* Returns: (transfer none): 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: (array fixed-size=16): a 4x4 transformation matrix to be applied
*
* Apply a transformation using the given 4x4 transformation matrix.
* Performs the multiplication, meta->matrix X 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);
}