rtsp: allow per feature registration

Split plugin into features including
dynamic types which can be indiviually
registered during a static build.

More details here:

https://gitlab.freedesktop.org/gstreamer/gst-build/-/merge_requests/199
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/661

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/876>

gst/rtsp/gstrtpdec.c

@@ -56,6 +56,7 @@
 #include <gst/rtp/gstrtcpbuffer.h>
 #endif
 
+#include "gstrtspelements.h"
 #include "gstrtpdec.h"
 #include <stdio.h>
 
@@ -196,6 +197,8 @@ static guint gst_rtp_dec_signals[LAST_SIGNAL] = { 0 };
 
 #define gst_rtp_dec_parent_class parent_class
 G_DEFINE_TYPE (GstRTPDec, gst_rtp_dec, GST_TYPE_ELEMENT);
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtpdec, "rtpdec", GST_RANK_NONE,
+    GST_TYPE_RTP_DEC, rtsp_element_init (plugin));
 
 static void
 gst_rtp_dec_class_init (GstRTPDecClass * g_class)

gst/rtsp/gstrtsp.c

@@ -45,26 +45,17 @@
 #include "config.h"
 #endif
 
-#include "gst/gst-i18n-plugin.h"
-
-#include "gstrtpdec.h"
-#include "gstrtspsrc.h"
+#include "gstrtspelements.h"
 
 static gboolean
 plugin_init (GstPlugin * plugin)
 {
-#ifdef ENABLE_NLS
-  bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
-  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
-#endif /* ENABLE_NLS */
+  gboolean ret = FALSE;
 
-  if (!gst_element_register (plugin, "rtspsrc", GST_RANK_NONE,
-          GST_TYPE_RTSPSRC))
-    return FALSE;
-  if (!gst_element_register (plugin, "rtpdec", GST_RANK_NONE, GST_TYPE_RTP_DEC))
-    return FALSE;
+  ret |= GST_ELEMENT_REGISTER (rtspsrc, plugin);
+  ret |= GST_ELEMENT_REGISTER (rtpdec, plugin);
 
-  return TRUE;
+  return ret;
 }
 
 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,

gst/rtsp/gstrtspelement.c

@@ -0,0 +1,65 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *               <2006> Wim Taymans <wim@fluendo.com>
+ * Copyright (C) 2020 Huawei Technologies Co., Ltd.
+ *   @Author: Stéphane Cerveau <stephane.cerveau@collabora.com>
+ *
+ * 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.
+ */
+/*
+ * Unless otherwise indicated, Source Code is licensed under MIT license.
+ * See further explanation attached in License Statement (distributed in the file
+ * LICENSE).
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is furnished to do
+ * so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gst/gst-i18n-plugin.h"
+
+#include "gstrtspelements.h"
+
+void
+rtsp_element_init (GstPlugin * plugin)
+{
+  static gsize res = FALSE;
+  if (g_once_init_enter (&res)) {
+#ifdef ENABLE_NLS
+    bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
+    bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+#endif /* ENABLE_NLS */
+    g_once_init_leave (&res, TRUE);
+  }
+}

gst/rtsp/gstrtspelements.h

@@ -41,13 +41,22 @@
  * SOFTWARE.
  */
 
-#ifndef __GST_RTSP_H__
-#define __GST_RTSP_H__
+#ifndef __GST_RTSP_ELEMENTS_H__
+#define __GST_RTSP_ELEMENTS_H__
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
 
 G_BEGIN_DECLS
 
+void rtsp_element_init (GstPlugin * plugin);
+
+GST_ELEMENT_REGISTER_DECLARE (rtspsrc);
+GST_ELEMENT_REGISTER_DECLARE (rtpdec);
 
 G_END_DECLS
 
-#endif /* __GST_RTSP_H__ */
-
+#endif /* __GST_RTSP_ELEMENTS_H__ */

gst/rtsp/gstrtspsrc.c

@@ -114,6 +114,7 @@
 
 #include "gst/gst-i18n-plugin.h"
 
+#include "gstrtspelements.h"
 #include "gstrtspsrc.h"
 
 GST_DEBUG_CATEGORY_STATIC (rtspsrc_debug);
@@ -479,6 +480,8 @@ static guint gst_rtspsrc_signals[LAST_SIGNAL] = { 0 };
 #define gst_rtspsrc_parent_class parent_class
 G_DEFINE_TYPE_WITH_CODE (GstRTSPSrc, gst_rtspsrc, GST_TYPE_BIN,
     G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_rtspsrc_uri_handler_init));
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (rtspsrc, "rtspsrc", GST_RANK_NONE,
+    GST_TYPE_RTSPSRC, rtsp_element_init (plugin));
 
 #ifndef GST_DISABLE_GST_DEBUG
 static inline const char *

gst/rtsp/meson.build

@@ -1,4 +1,5 @@
 rtsp_sources = [
+  'gstrtspelement.c',
   'gstrtsp.c',
   'gstrtspsrc.c',
   'gstrtpdec.c',