--- /dev/null
+/* GStreamer
+ * Copyright (C) <2014> William Manley <will@williammanley.net>
+ *
+ * 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:gstnetcontrolmessagemeta
+ * @short_description: Network Control Message Meta
+ *
+ * #GstNetControlMessageMeta can be used to store control messages (ancillary
+ * data) which was received with or is to be sent alongside the buffer data.
+ * When used with socket sinks and sources which understand this meta it allows
+ * sending and receiving ancillary data such as unix credentials (See
+ * #GUnixCredentialsMessage) and Unix file descriptions (See #GUnixFDMessage).
+ */
+
+#include <string.h>
+
+#include "gstnetcontrolmessagemeta.h"
+
+static gboolean
+net_control_message_meta_init (GstMeta * meta, gpointer params,
+ GstBuffer * buffer)
+{
+ GstNetControlMessageMeta *nmeta = (GstNetControlMessageMeta *) meta;
+
+ nmeta->message = NULL;
+
+ return TRUE;
+}
+
+static gboolean
+net_control_message_meta_transform (GstBuffer * transbuf, GstMeta * meta,
+ GstBuffer * buffer, GQuark type, gpointer data)
+{
+ GstNetControlMessageMeta *nmeta = (GstNetControlMessageMeta *) meta;
+
+ /* we always copy no matter what transform */
+ gst_buffer_add_net_control_message_meta (transbuf, nmeta->message);
+
+ return TRUE;
+}
+
+static void
+net_control_message_meta_free (GstMeta * meta, GstBuffer * buffer)
+{
+ GstNetControlMessageMeta *nmeta = (GstNetControlMessageMeta *) meta;
+
+ if (nmeta->message)
+ g_object_unref (nmeta->message);
+ nmeta->message = NULL;
+}
+
+GType
+gst_net_control_message_meta_api_get_type (void)
+{
+ static volatile GType type;
+ static const gchar *tags[] = { "origin", NULL };
+
+ if (g_once_init_enter (&type)) {
+ GType _type =
+ gst_meta_api_type_register ("GstNetControlMessageMetaAPI", tags);
+ g_once_init_leave (&type, _type);
+ }
+ return type;
+}
+
+const GstMetaInfo *
+gst_net_control_message_meta_get_info (void)
+{
+ static const GstMetaInfo *meta_info = NULL;
+
+ if (g_once_init_enter (&meta_info)) {
+ const GstMetaInfo *mi =
+ gst_meta_register (GST_NET_CONTROL_MESSAGE_META_API_TYPE,
+ "GstNetControlMessageMeta",
+ sizeof (GstNetControlMessageMeta),
+ net_control_message_meta_init,
+ net_control_message_meta_free,
+ net_control_message_meta_transform);
+ g_once_init_leave (&meta_info, mi);
+ }
+ return meta_info;
+}
+
+/**
+ * gst_buffer_add_net_control_message_meta:
+ * @buffer: a #GstBuffer
+ * @message: a @GSocketControlMessage to attach to @buffer
+ *
+ * Attaches @message as metadata in a #GstNetControlMessageMeta to @buffer.
+ *
+ * Returns: (transfer none): a #GstNetControlMessageMeta connected to @buffer
+ */
+GstNetControlMessageMeta *
+gst_buffer_add_net_control_message_meta (GstBuffer * buffer,
+ GSocketControlMessage * message)
+{
+ GstNetControlMessageMeta *meta;
+
+ g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
+ g_return_val_if_fail (G_IS_SOCKET_CONTROL_MESSAGE (message), NULL);
+
+ meta =
+ (GstNetControlMessageMeta *) gst_buffer_add_meta (buffer,
+ GST_NET_CONTROL_MESSAGE_META_INFO, NULL);
+
+ meta->message = g_object_ref (message);
+
+ return meta;
+}
--- /dev/null
+/* GStreamer
+ * Copyright (C) <2014> William Manley <will@williammanley.net>
+ *
+ * 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.
+ */
+
+#ifndef __GST_NET_CONTROL_MESSAGE_META_H__
+#define __GST_NET_CONTROL_MESSAGE_META_H__
+
+#include <gst/gst.h>
+#include <gio/gio.h>
+
+G_BEGIN_DECLS
+
+typedef struct _GstNetControlMessageMeta GstNetControlMessageMeta;
+
+/**
+ * GstNetControlMessageMeta:
+ * @meta: the parent type
+ * @addr: a #GSocketControlMessage stored as metadata
+ *
+ * Buffer metadata for GSocket control messages, AKA ancillary data attached to
+ * data sent across a socket.
+ */
+struct _GstNetControlMessageMeta {
+ GstMeta meta;
+
+ GSocketControlMessage *message;
+};
+
+GType gst_net_control_message_meta_api_get_type (void);
+#define GST_NET_CONTROL_MESSAGE_META_API_TYPE \
+ (gst_net_control_message_meta_api_get_type())
+
+#define gst_buffer_get_net_control_message_meta(b) ((GstNetControlMessageMeta*)\
+ gst_buffer_get_meta((b),GST_NET_CONTROL_MESSAGE_META_API_TYPE))
+
+/* implementation */
+const GstMetaInfo *gst_net_control_message_meta_get_info (void);
+#define GST_NET_CONTROL_MESSAGE_META_INFO \
+ (gst_net_control_message_meta_get_info())
+
+GstNetControlMessageMeta * gst_buffer_add_net_control_message_meta (
+ GstBuffer *buffer, GSocketControlMessage *addr);
+
+G_END_DECLS
+
+#endif /* __GST_NET_CONTROL_MESSAGE_META_H__ */
+