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Member "gstreamer-1.16.1/libs/gst/net/gstnetcontrolmessagemeta.c" (19 Apr 2019, 3987 Bytes) of package /linux/misc/gstreamer-1.16.1.tar.xz:


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    1 /* GStreamer
    2  * Copyright (C) <2014> William Manley <will@williammanley.net>
    3  *
    4  * This library is free software; you can redistribute it and/or
    5  * modify it under the terms of the GNU Library General Public
    6  * License as published by the Free Software Foundation; either
    7  * version 2 of the License, or (at your option) any later version.
    8  *
    9  * This library is distributed in the hope that it will be useful,
   10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   12  * Library General Public License for more details.
   13  *
   14  * You should have received a copy of the GNU Library General Public
   15  * License along with this library; if not, write to the
   16  * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
   17  * Boston, MA 02110-1301, USA.
   18  */
   19 
   20 /**
   21  * SECTION:gstnetcontrolmessagemeta
   22  * @title: GstNetControlMessageMeta
   23  * @short_description: Network Control Message Meta
   24  *
   25  * #GstNetControlMessageMeta can be used to store control messages (ancillary
   26  * data) which was received with or is to be sent alongside the buffer data.
   27  * When used with socket sinks and sources which understand this meta it allows
   28  * sending and receiving ancillary data such as unix credentials (See
   29  * #GUnixCredentialsMessage) and Unix file descriptions (See #GUnixFDMessage).
   30  */
   31 #ifdef HAVE_CONFIG_H
   32 #include "config.h"
   33 #endif
   34 
   35 #include <string.h>
   36 
   37 #include "gstnetcontrolmessagemeta.h"
   38 
   39 static gboolean
   40 net_control_message_meta_init (GstMeta * meta, gpointer params,
   41     GstBuffer * buffer)
   42 {
   43   GstNetControlMessageMeta *nmeta = (GstNetControlMessageMeta *) meta;
   44 
   45   nmeta->message = NULL;
   46 
   47   return TRUE;
   48 }
   49 
   50 static gboolean
   51 net_control_message_meta_transform (GstBuffer * transbuf, GstMeta * meta,
   52     GstBuffer * buffer, GQuark type, gpointer data)
   53 {
   54   GstNetControlMessageMeta *smeta, *dmeta;
   55   smeta = (GstNetControlMessageMeta *) meta;
   56 
   57   /* we always copy no matter what transform */
   58   dmeta = gst_buffer_add_net_control_message_meta (transbuf, smeta->message);
   59   if (!dmeta)
   60     return FALSE;
   61 
   62   return TRUE;
   63 }
   64 
   65 static void
   66 net_control_message_meta_free (GstMeta * meta, GstBuffer * buffer)
   67 {
   68   GstNetControlMessageMeta *nmeta = (GstNetControlMessageMeta *) meta;
   69 
   70   if (nmeta->message)
   71     g_object_unref (nmeta->message);
   72   nmeta->message = NULL;
   73 }
   74 
   75 GType
   76 gst_net_control_message_meta_api_get_type (void)
   77 {
   78   static volatile GType type;
   79   static const gchar *tags[] = { "origin", NULL };
   80 
   81   if (g_once_init_enter (&type)) {
   82     GType _type =
   83         gst_meta_api_type_register ("GstNetControlMessageMetaAPI", tags);
   84     g_once_init_leave (&type, _type);
   85   }
   86   return type;
   87 }
   88 
   89 const GstMetaInfo *
   90 gst_net_control_message_meta_get_info (void)
   91 {
   92   static const GstMetaInfo *meta_info = NULL;
   93 
   94   if (g_once_init_enter ((GstMetaInfo **) & meta_info)) {
   95     const GstMetaInfo *mi =
   96         gst_meta_register (GST_NET_CONTROL_MESSAGE_META_API_TYPE,
   97         "GstNetControlMessageMeta",
   98         sizeof (GstNetControlMessageMeta),
   99         net_control_message_meta_init,
  100         net_control_message_meta_free,
  101         net_control_message_meta_transform);
  102     g_once_init_leave ((GstMetaInfo **) & meta_info, (GstMetaInfo *) mi);
  103   }
  104   return meta_info;
  105 }
  106 
  107 /**
  108  * gst_buffer_add_net_control_message_meta:
  109  * @buffer: a #GstBuffer
  110  * @message: a @GSocketControlMessage to attach to @buffer
  111  *
  112  * Attaches @message as metadata in a #GstNetControlMessageMeta to @buffer.
  113  *
  114  * Returns: (transfer none): a #GstNetControlMessageMeta connected to @buffer
  115  */
  116 GstNetControlMessageMeta *
  117 gst_buffer_add_net_control_message_meta (GstBuffer * buffer,
  118     GSocketControlMessage * message)
  119 {
  120   GstNetControlMessageMeta *meta;
  121 
  122   g_return_val_if_fail (GST_IS_BUFFER (buffer), NULL);
  123   g_return_val_if_fail (G_IS_SOCKET_CONTROL_MESSAGE (message), NULL);
  124 
  125   meta =
  126       (GstNetControlMessageMeta *) gst_buffer_add_meta (buffer,
  127       GST_NET_CONTROL_MESSAGE_META_INFO, NULL);
  128 
  129   meta->message = g_object_ref (message);
  130 
  131   return meta;
  132 }