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160 lines
4.5 KiB
C
160 lines
4.5 KiB
C
/* GStreamer
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* Copyright (C) <2014> Collabora Ltd.
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* Author: Matthieu Bouron <matthieu.bouron@gmail.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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#include "gstvideoaffinetransformationmeta.h"
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#include <string.h>
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/**
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* SECTION:gstvideoaffinetransformationmeta
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* @title: GstVideoAffineTransformationMeta
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* @short_description: GstMeta for video affine transformation
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*
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*/
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GType
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gst_video_affine_transformation_meta_api_get_type (void)
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{
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static volatile GType type = 0;
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static const gchar *tags[] =
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{ GST_META_TAG_VIDEO_STR, GST_META_TAG_VIDEO_ORIENTATION_STR,
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GST_META_TAG_VIDEO_ORIENTATION_STR, NULL
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};
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if (g_once_init_enter (&type)) {
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GType _type =
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gst_meta_api_type_register ("GstVideoAffineTransformationAPI", 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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static gboolean
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gst_video_affine_transformation_meta_transform (GstBuffer * dest,
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GstMeta * meta, GstBuffer * buffer, GQuark type, gpointer data)
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{
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GstVideoAffineTransformationMeta *dmeta, *smeta;
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smeta = (GstVideoAffineTransformationMeta *) meta;
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if (GST_META_TRANSFORM_IS_COPY (type)) {
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dmeta =
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(GstVideoAffineTransformationMeta *) gst_buffer_add_meta (dest,
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GST_VIDEO_AFFINE_TRANSFORMATION_META_INFO, NULL);
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if (!dmeta)
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return FALSE;
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memcpy (dmeta->matrix, smeta->matrix, sizeof (dmeta->matrix[0]) * 16);
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}
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return TRUE;
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}
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static gboolean
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gst_video_affine_transformation_meta_init (GstMeta * meta, gpointer params,
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GstBuffer * buffer)
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{
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GstVideoAffineTransformationMeta *af_meta =
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(GstVideoAffineTransformationMeta *) meta;
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gfloat matrix[] = {
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1.0f, 0.0f, 0.0f, 0.0f,
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0.0f, 1.0f, 0.0f, 0.0f,
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0.0f, 0.0f, 1.0f, 0.0f,
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0.0f, 0.0f, 0.0f, 1.0f
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};
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memcpy (af_meta->matrix, matrix, sizeof (matrix[0]) * 16);
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return TRUE;
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}
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const GstMetaInfo *
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gst_video_affine_transformation_meta_get_info (void)
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{
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static const GstMetaInfo *info = NULL;
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if (g_once_init_enter ((GstMetaInfo **) & info)) {
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const GstMetaInfo *meta =
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gst_meta_register (GST_VIDEO_AFFINE_TRANSFORMATION_META_API_TYPE,
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"GstVideoAffineTransformationMeta",
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sizeof (GstVideoAffineTransformationMeta),
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gst_video_affine_transformation_meta_init,
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NULL,
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gst_video_affine_transformation_meta_transform);
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g_once_init_leave ((GstMetaInfo **) & info, (GstMetaInfo *) meta);
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}
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return info;
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}
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/**
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* gst_buffer_add_video_affine_transformation_meta:
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* @buffer: a #GstBuffer
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*
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* Attaches GstVideoAffineTransformationMeta metadata to @buffer with
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* the given parameters.
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*
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* Returns: (transfer none): the #GstVideoAffineTransformationMeta on @buffer.
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*
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* Since: 1.8
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*/
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GstVideoAffineTransformationMeta *
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gst_buffer_add_video_affine_transformation_meta (GstBuffer * buffer)
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{
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GstVideoAffineTransformationMeta *meta;
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g_return_val_if_fail (buffer != NULL, NULL);
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meta =
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(GstVideoAffineTransformationMeta *) gst_buffer_add_meta (buffer,
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GST_VIDEO_AFFINE_TRANSFORMATION_META_INFO, NULL);
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if (!meta)
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return NULL;
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return meta;
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}
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/**
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* gst_video_affine_transformation_meta_apply_matrix:
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* @meta: a #GstVideoAffineTransformationMeta
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* @matrix: a 4x4 transformation matrix to be applied
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*
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* Apply a transformation using the given 4x4 transformation matrix.
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* Performs the multiplication, meta->matrix X matrix.
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*
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* Since: 1.8
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*/
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void gst_video_affine_transformation_meta_apply_matrix
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(GstVideoAffineTransformationMeta * meta, const gfloat matrix[16])
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{
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gfloat res[16] = { 0.0f };
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int i, j, k;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++) {
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for (k = 0; k < 4; k++) {
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res[i + (j * 4)] += meta->matrix[i + (k * 4)] * matrix[k + (j * 4)];
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}
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}
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}
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memcpy (meta->matrix, res, sizeof (meta->matrix[0]) * 16);
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}
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