jpeg: 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/jpeg/gstjpeg.c

@@ -21,16 +21,12 @@
 #endif
 
 #include <string.h>
+#include <stdio.h>
 
+#include <jpeglib.h>
 #include <gst/gst.h>
 
 #include "gstjpeg.h"
-#include "gstjpegdec.h"
-#include "gstjpegenc.h"
-#if 0
-#include "gstsmokeenc.h"
-#include "gstsmokedec.h"
-#endif
 
 GType
 gst_idct_method_get_type (void)
@@ -48,34 +44,3 @@ gst_idct_method_get_type (void)
   }
   return idct_method_type;
 }
-
-static gboolean
-plugin_init (GstPlugin * plugin)
-{
-
-  if (!gst_element_register (plugin, "jpegenc", GST_RANK_PRIMARY,
-          GST_TYPE_JPEGENC))
-    return FALSE;
-
-  if (!gst_element_register (plugin, "jpegdec", GST_RANK_PRIMARY,
-          GST_TYPE_JPEG_DEC))
-    return FALSE;
-
-#if 0
-  if (!gst_element_register (plugin, "smokeenc", GST_RANK_PRIMARY,
-          GST_TYPE_SMOKEENC))
-    return FALSE;
-
-  if (!gst_element_register (plugin, "smokedec", GST_RANK_PRIMARY,
-          GST_TYPE_SMOKEDEC))
-    return FALSE;
-#endif
-
-  return TRUE;
-}
-
-GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
-    GST_VERSION_MINOR,
-    jpeg,
-    "JPeg plugin library",
-    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

ext/jpeg/gstjpegdec.c

@@ -38,8 +38,9 @@
 #endif
 #include <string.h>
 
-#include "gstjpegdec.h"
 #include "gstjpeg.h"
+#include "gstjpegdec.h"
+#include "gstjpegelements.h"
 #include <gst/video/video.h>
 #include <gst/video/gstvideometa.h>
 #include <gst/video/gstvideopool.h>
@@ -109,6 +110,8 @@ static gboolean gst_jpeg_dec_sink_event (GstVideoDecoder * bdec,
 
 #define gst_jpeg_dec_parent_class parent_class
 G_DEFINE_TYPE (GstJpegDec, gst_jpeg_dec, GST_TYPE_VIDEO_DECODER);
+GST_ELEMENT_REGISTER_DEFINE (jpegdec, "jpegdec", GST_RANK_PRIMARY,
+    GST_TYPE_JPEG_DEC);
 
 static void
 gst_jpeg_dec_finalize (GObject * object)

ext/jpeg/gstjpegelements.h

@@ -0,0 +1,37 @@
+/* GStreamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ * Copyright (C) 2020 Huawei Technologies Co., Ltd.
+ *   @Author: Stéphane Cerveau <scerveau@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_JPEG_ELEMENTS_H__
+#define __GST_JPEG_ELEMENTS_H__
+
+G_BEGIN_DECLS
+
+GST_ELEMENT_REGISTER_DECLARE (jpegenc);
+GST_ELEMENT_REGISTER_DECLARE (jpegdec);
+#if 0
+GST_ELEMENT_REGISTER_DECLARE (smokeenc);
+GST_ELEMENT_REGISTER_DECLARE (smokedec);
+#endif
+
+G_END_DECLS
+
+#endif /* __GST_JPEG_ELEMENTS_H__ */

ext/jpeg/gstjpegenc.c

@@ -37,8 +37,9 @@
 #endif
 #include <string.h>
 
-#include "gstjpegenc.h"
 #include "gstjpeg.h"
+#include "gstjpegenc.h"
+#include "gstjpegelements.h"
 #include <gst/video/video.h>
 #include <gst/video/gstvideometa.h>
 #include <gst/base/base.h>
@@ -93,6 +94,8 @@ static gboolean gst_jpegenc_propose_allocation (GstVideoEncoder * encoder,
 
 #define gst_jpegenc_parent_class parent_class
 G_DEFINE_TYPE (GstJpegEnc, gst_jpegenc, GST_TYPE_VIDEO_ENCODER);
+GST_ELEMENT_REGISTER_DEFINE (jpegenc, "jpegenc", GST_RANK_PRIMARY,
+    GST_TYPE_JPEGENC);
 
 /* *INDENT-OFF* */
 static GstStaticPadTemplate gst_jpegenc_sink_pad_template =

ext/jpeg/gstjpegplugin.c

@@ -0,0 +1,52 @@
+
+/* 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 <string.h>
+#include <stdio.h>
+
+#include <jpeglib.h>
+#include <gst/gst.h>
+
+#include "gstjpegelements.h"
+
+static gboolean
+plugin_init (GstPlugin * plugin)
+{
+  gboolean ret = FALSE;
+
+  ret |= GST_ELEMENT_REGISTER (jpegenc, plugin);
+  ret |= GST_ELEMENT_REGISTER (jpegdec, plugin);
+
+#if 0
+  ret |= GST_ELEMENT_REGISTER (smokeenc, plugin);
+  ret |= GST_ELEMENT_REGISTER (smokedec, plugin);
+#endif
+
+  return ret;
+}
+
+GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
+    GST_VERSION_MINOR,
+    jpeg,
+    "JPeg plugin library",
+    plugin_init, VERSION, "LGPL", GST_PACKAGE_NAME, GST_PACKAGE_ORIGIN)

ext/jpeg/gstsmokedec.c

@@ -86,6 +86,9 @@ gst_smokedec_get_type (void)
   return smokedec_type;
 }
 
+GST_ELEMENT_REGISTER_DEFINE (smokedec, "smokedec", GST_RANK_PRIMARY,
+    GST_TYPE_SMOKEDEC);
+
 static GstStaticPadTemplate gst_smokedec_src_pad_template =
 GST_STATIC_PAD_TEMPLATE ("src",
     GST_PAD_SRC,

ext/jpeg/gstsmokeenc.c

@@ -103,6 +103,9 @@ gst_smokeenc_get_type (void)
   return smokeenc_type;
 }
 
+GST_ELEMENT_REGISTER_DEFINE (smokeenc, "smokeenc", GST_RANK_PRIMARY,
+    GST_TYPE_SMOKEENC);
+
 static GstStaticPadTemplate gst_smokeenc_sink_pad_template =
 GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,

ext/jpeg/meson.build

@@ -1,5 +1,6 @@
 jpeg_sources = [
   'gstjpeg.c',
+  'gstjpegplugin.c',
   'gstjpegenc.c',
   'gstjpegdec.c',
 ]