gstreamer/ext/ttml/subtitlemeta.c
Matthew Waters 640a65bf96 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-bad/-/merge_requests/2098>
2021-03-22 14:34:36 +11:00

102 lines
3 KiB
C

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