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d6c425fc58
Knowing the positioning and size of each frame in the composition can help applications optimize their rendering pipeline. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5652>
136 lines
4 KiB
C
136 lines
4 KiB
C
/* GStreamer
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* Copyright (C) 2013 Mathieu Duponchelle <mduponchelle1@gmail.com>
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* Copyright (C) 2013 Thibault Saunier <thibault.saunier@collabora.com>
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* Copyright (C) 2020 Thibault Saunier <tsaunier@igalia.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 Street, Suite 500,
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* Boston, MA 02110-1335, USA.
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*/
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/**
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* SECTION: gesframecompositionmeta
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* @title: GESFrameCompositionMeta interface
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* @short_description: A Meta providing positioning information for a given
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* video frame
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*
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* Since: 1.24
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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 "ges-frame-composition-meta.h"
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#include "gstframepositioner.h"
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static gboolean ges_frame_composition_meta_init (GstMeta * meta,
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gpointer params, GstBuffer * buffer);
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static gboolean ges_frame_composition_meta_transform (GstBuffer * dest,
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GstMeta * meta, GstBuffer * buffer, GQuark type, gpointer data);
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GType
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ges_frame_composition_meta_api_get_type (void)
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{
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static GType type;
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static const gchar *tags[] = { "video", NULL };
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if (g_once_init_enter (&type)) {
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GType _type = gst_meta_api_type_register ("GstFrameCompositionApi", 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 const GstMetaInfo *
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ges_frame_composition_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 ((GstMetaInfo **) & meta_info)) {
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const GstMetaInfo *meta =
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gst_meta_register (ges_frame_composition_meta_api_get_type (),
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"GESFrameCompositionMeta",
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sizeof (GESFrameCompositionMeta), ges_frame_composition_meta_init, NULL,
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ges_frame_composition_meta_transform);
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g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) meta);
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}
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return meta_info;
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}
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static gboolean
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ges_frame_composition_meta_init (GstMeta * meta, gpointer params,
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GstBuffer * buffer)
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{
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int default_operator_value = 0;
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GESFrameCompositionMeta *smeta;
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smeta = (GESFrameCompositionMeta *) meta;
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gst_compositor_operator_get_type_and_default_value (&default_operator_value);
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smeta->alpha = 0.0;
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smeta->posx = smeta->posy = smeta->height = smeta->width = 0;
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smeta->zorder = 0;
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smeta->operator = default_operator_value;
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return TRUE;
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}
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static gboolean
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ges_frame_composition_meta_transform (GstBuffer * dest, GstMeta * meta,
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GstBuffer * buffer, GQuark type, gpointer data)
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{
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GESFrameCompositionMeta *dmeta, *smeta;
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smeta = (GESFrameCompositionMeta *) meta;
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if (GST_META_TRANSFORM_IS_COPY (type)) {
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/* only copy if the complete data is copied as well */
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dmeta =
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(GESFrameCompositionMeta *) gst_buffer_add_meta (dest,
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ges_frame_composition_meta_get_info (), NULL);
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dmeta->alpha = smeta->alpha;
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dmeta->posx = smeta->posx;
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dmeta->posy = smeta->posy;
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dmeta->width = smeta->width;
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dmeta->height = smeta->height;
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dmeta->zorder = smeta->zorder;
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dmeta->operator = smeta->operator;
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}
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return TRUE;
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}
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/**
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* ges_buffer_add_frame_composition_meta:
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* @buffer: #GstBuffer to which protection metadata should be added.
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*
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* Attaches positioning metadata to a #GstBuffer.
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*
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* Returns: (transfer none): a pointer to the added #GESFrameCompositionMeta.
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*
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* Since: 1.24
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*/
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GESFrameCompositionMeta *
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ges_buffer_add_frame_composition_meta (GstBuffer * buffer)
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{
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GESFrameCompositionMeta *meta;
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meta =
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(GESFrameCompositionMeta *) gst_buffer_add_meta (buffer,
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ges_frame_composition_meta_get_info (), NULL);
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return meta;
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}
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