flac: 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>

ext/flac/gstflac.c

@@ -21,36 +21,18 @@
 #include "config.h"
 #endif
 
-#include "gstflacenc.h"
-#include "gstflacdec.h"
-#include "gstflactag.h"
-
-#include <gst/tag/tag.h>
-#include <gst/gst-i18n-plugin.h>
+#include "gstflacelements.h"
 
 static gboolean
 plugin_init (GstPlugin * plugin)
 {
-#ifdef ENABLE_NLS
-  GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
-      LOCALEDIR);
-  bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
-  bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
-#endif
+  gboolean ret = FALSE;
 
-  if (!gst_element_register (plugin, "flacenc", GST_RANK_PRIMARY,
-          GST_TYPE_FLAC_ENC))
-    return FALSE;
-  if (!gst_element_register (plugin, "flacdec", GST_RANK_PRIMARY,
-          GST_TYPE_FLAC_DEC))
-    return FALSE;
-  if (!gst_element_register (plugin, "flactag", GST_RANK_PRIMARY,
-          gst_flac_tag_get_type ()))
-    return FALSE;
+  ret |= GST_ELEMENT_REGISTER (flacdec, plugin);
+  ret |= GST_ELEMENT_REGISTER (flacenc, plugin);
+  ret |= GST_ELEMENT_REGISTER (flactag, plugin);
 
-  gst_tag_register_musicbrainz_tags ();
-
-  return TRUE;
+  return ret;
 }
 
 GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,

ext/flac/gstflacdec.c

@@ -47,6 +47,8 @@
 #include <gst/gst-i18n-plugin.h>
 #include <gst/tag/tag.h>
 
+#include "gstflacelements.h"
+
 /* Taken from http://flac.sourceforge.net/format.html#frame_header */
 static const GstAudioChannelPosition channel_positions[8][8] = {
   {GST_AUDIO_CHANNEL_POSITION_MONO},
@@ -114,6 +116,9 @@ static GstFlowReturn gst_flac_dec_handle_frame (GstAudioDecoder * audio_dec,
     GstBuffer * buf);
 
 G_DEFINE_TYPE (GstFlacDec, gst_flac_dec, GST_TYPE_AUDIO_DECODER);
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (flacdec, "flacdec", GST_RANK_PRIMARY,
+    GST_TYPE_FLAC_DEC, flac_element_init (plugin));
+
 
 #if G_BYTE_ORDER == G_LITTLE_ENDIAN
 #define FORMATS "{ S8, S16LE, S24_32LE, S32LE } "

ext/flac/gstflacelement.c

@@ -0,0 +1,43 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstflacelements.h"
+
+#include <gst/tag/tag.h>
+#include <gst/gst-i18n-plugin.h>
+
+void
+flac_element_init (GstPlugin * plugin)
+{
+  static gsize res = FALSE;
+  if (g_once_init_enter (&res)) {
+#ifdef ENABLE_NLS
+    GST_DEBUG ("binding text domain %s to locale dir %s", GETTEXT_PACKAGE,
+        LOCALEDIR);
+    bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
+    bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+#endif
+    gst_tag_register_musicbrainz_tags ();
+    g_once_init_leave (&res, TRUE);
+  }
+}

ext/flac/gstflacelements.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2020 Huawei Technologies Co., Ltd.
+ *   @Author: Julian Bouzas <julian.bouzas@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.
+ */
+
+#ifndef __GST_FLAC_ELEMENTS_H__
+#define __GST_FLAC_ELEMENTS_H__
+
+#include <gst/gst.h>
+
+G_BEGIN_DECLS
+
+
+void flac_element_init (GstPlugin * plugin);
+
+GST_ELEMENT_REGISTER_DECLARE (flacenc);
+GST_ELEMENT_REGISTER_DECLARE (flacdec);
+GST_ELEMENT_REGISTER_DECLARE (flactag);
+
+G_END_DECLS
+
+#endif /* __GST_FLAC_ELEMENTS_H__ */

ext/flac/gstflacenc.c

@@ -55,6 +55,8 @@
 #include <gst/tag/tag.h>
 #include <gst/gsttagsetter.h>
 
+#include "gstflacelements.h"
+
 /* Taken from http://flac.sourceforge.net/format.html#frame_header */
 static const GstAudioChannelPosition channel_positions[8][8] = {
   {GST_AUDIO_CHANNEL_POSITION_MONO},
@@ -131,6 +133,8 @@ G_DEFINE_TYPE_WITH_CODE (GstFlacEnc, gst_flac_enc, GST_TYPE_AUDIO_ENCODER,
     G_IMPLEMENT_INTERFACE (GST_TYPE_TAG_SETTER, NULL)
     G_IMPLEMENT_INTERFACE (GST_TYPE_TOC_SETTER, NULL)
     );
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (flacenc, "flacenc", GST_RANK_PRIMARY,
+    GST_TYPE_FLAC_ENC, flac_element_init (plugin));
 
 static gboolean gst_flac_enc_start (GstAudioEncoder * enc);
 static gboolean gst_flac_enc_stop (GstAudioEncoder * enc);

ext/flac/gstflactag.c

@@ -54,6 +54,7 @@
 #include <gst/tag/tag.h>
 #include <string.h>
 
+#include "gstflacelements.h"
 #include "gstflactag.h"
 
 GST_DEBUG_CATEGORY_STATIC (flactag_debug);
@@ -89,6 +90,8 @@ static gboolean gst_flac_tag_sink_event (GstPad * pad, GstObject * parent,
 #define gst_flac_tag_parent_class parent_class
 G_DEFINE_TYPE_WITH_CODE (GstFlacTag, gst_flac_tag, GST_TYPE_ELEMENT,
     G_IMPLEMENT_INTERFACE (GST_TYPE_TAG_SETTER, NULL));
+GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (flactag, "flactag", GST_RANK_PRIMARY,
+    GST_TYPE_FLAC_TAG, flac_element_init (plugin));
 
 
 static void

ext/flac/meson.build

@@ -1,5 +1,6 @@
 flac_sources = [
   'gstflac.c',
+  'gstflacelement.c',
   'gstflacdec.c',
   'gstflacenc.c',
   'gstflactag.c',