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640a65bf96
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-bad/-/merge_requests/2098>
103 lines
3 KiB
C
103 lines
3 KiB
C
/* GStreamer
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* Copyright (C) <2015> British Broadcasting Corporation
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* Author: Chris Bass <dash@rd.bbc.co.uk>
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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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/**
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* SECTION:gstsubtitlemeta
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* @title: GstSubtitleMeta
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* @short_description: Metadata class for timed-text subtitles.
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*
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* The GstSubtitleMeta class enables the layout and styling information needed
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* to render subtitle text to be attached to a #GstBuffer containing that text.
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*/
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#include "subtitlemeta.h"
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GType
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gst_subtitle_meta_api_get_type (void)
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{
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static GType type;
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static const gchar *tags[] = { "memory", NULL };
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if (g_once_init_enter (&type)) {
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GType _type = gst_meta_api_type_register ("GstSubtitleMetaAPI", 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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gboolean
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gst_subtitle_meta_init (GstMeta * meta, gpointer params, GstBuffer * buffer)
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{
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GstSubtitleMeta *subtitle_meta = (GstSubtitleMeta *) meta;
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subtitle_meta->regions = NULL;
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return TRUE;
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}
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void
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gst_subtitle_meta_free (GstMeta * meta, GstBuffer * buffer)
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{
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GstSubtitleMeta *subtitle_meta = (GstSubtitleMeta *) meta;
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if (subtitle_meta->regions)
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g_ptr_array_unref (subtitle_meta->regions);
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}
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const GstMetaInfo *
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gst_subtitle_meta_get_info (void)
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{
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static const GstMetaInfo *subtitle_meta_info = NULL;
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if (g_once_init_enter (&subtitle_meta_info)) {
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const GstMetaInfo *meta =
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gst_meta_register (GST_SUBTITLE_META_API_TYPE, "GstSubtitleMeta",
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sizeof (GstSubtitleMeta), gst_subtitle_meta_init,
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gst_subtitle_meta_free, (GstMetaTransformFunction) NULL);
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g_once_init_leave (&subtitle_meta_info, meta);
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}
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return subtitle_meta_info;
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}
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/**
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* gst_buffer_add_subtitle_meta:
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* @buffer: (transfer none): #GstBuffer holding subtitle text, to which
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* subtitle metadata should be added.
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* @regions: (transfer full): A #GPtrArray of #GstSubtitleRegions.
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*
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* Attaches subtitle metadata to a #GstBuffer.
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*
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* Returns: A pointer to the added #GstSubtitleMeta if successful; %NULL if
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* unsuccessful.
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*/
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GstSubtitleMeta *
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gst_buffer_add_subtitle_meta (GstBuffer * buffer, GPtrArray * regions)
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{
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GstSubtitleMeta *meta;
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g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
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g_return_val_if_fail (regions != NULL, NULL);
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meta = (GstSubtitleMeta *) gst_buffer_add_meta (buffer,
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GST_SUBTITLE_META_INFO, NULL);
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meta->regions = regions;
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return meta;
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}
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