d3d11decoder: Remove duplicated class_init and property related code

Move them into the decoder helper code to remove duplication

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2525>

8 files changed, 190 insertions, 387 deletions

diff --git a/sys/d3d11/gstd3d11av1dec.cpp b/sys/d3d11/gstd3d11av1dec.cpp
index c47959899..e148dbb6c 100644
--- a/sys/d3d11/gstd3d11av1dec.cpp
+++ b/sys/d3d11/gstd3d11av1dec.cpp
@@ -350,14 +350,6 @@ typedef struct _GST_DXVA_Tile_AV1
 
 #pragma pack(pop)
 
-enum
-{
-  PROP_0,
-  PROP_ADAPTER,
-  PROP_DEVICE_ID,
-  PROP_VENDOR_ID,
-};
-
 /* reference list 8 + 4 margin */
 #define NUM_OUTPUT_VIEW 12
 
@@ -386,9 +378,7 @@ typedef struct _GstD3D11AV1Dec
 typedef struct _GstD3D11AV1DecClass
 {
   GstAV1DecoderClass parent_class;
-  guint adapter;
-  guint device_id;
-  guint vendor_id;
+  GstD3D11DecoderSubClassData class_data;
 } GstD3D11AV1DecClass;
 
 static GstElementClass *parent_class = NULL;
@@ -438,48 +428,17 @@ gst_d3d11_av1_dec_class_init (GstD3D11AV1DecClass * klass, gpointer data)
   GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
   GstAV1DecoderClass *av1decoder_class = GST_AV1_DECODER_CLASS (klass);
   GstD3D11DecoderClassData *cdata = (GstD3D11DecoderClassData *) data;
-  gchar *long_name;
 
   gobject_class->get_property = gst_d3d11_av1_dec_get_property;
   gobject_class->dispose = gst_d3d11_av1_dec_dispose;
 
-  g_object_class_install_property (gobject_class, PROP_ADAPTER,
-      g_param_spec_uint ("adapter", "Adapter",
-          "DXGI Adapter index for creating device",
-          0, G_MAXUINT32, cdata->adapter,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_DEVICE_ID,
-      g_param_spec_uint ("device-id", "Device Id",
-          "DXGI Device ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_VENDOR_ID,
-      g_param_spec_uint ("vendor-id", "Vendor Id",
-          "DXGI Vendor ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-
-  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
-
-  klass->adapter = cdata->adapter;
-  klass->device_id = cdata->device_id;
-  klass->vendor_id = cdata->vendor_id;
-
   element_class->set_context =
       GST_DEBUG_FUNCPTR (gst_d3d11_av1_dec_set_context);
 
-  long_name =
-      g_strdup_printf ("Direct3D11/DXVA AV1 %s Decoder", cdata->description);
-  gst_element_class_set_metadata (element_class, long_name,
-      "Codec/Decoder/Video/Hardware", "A Direct3D11/DXVA AV1 video decoder",
+  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
+  gst_d3d11_decoder_class_data_fill_subclass_data (cdata, &klass->class_data);
+  gst_d3d11_decoder_proxy_class_init (element_class, cdata,
       "Seungha Yang <seungha@centricular.com>");
-  g_free (long_name);
-
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
-          cdata->sink_caps));
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
-          cdata->src_caps));
-  gst_d3d11_decoder_class_data_free (cdata);
 
   decoder_class->open = GST_DEBUG_FUNCPTR (gst_d3d11_av1_dec_open);
   decoder_class->close = GST_DEBUG_FUNCPTR (gst_d3d11_av1_dec_close);
@@ -516,21 +475,9 @@ gst_d3d11_av1_dec_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstD3D11AV1DecClass *klass = GST_D3D11_AV1_DEC_GET_CLASS (object);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  switch (prop_id) {
-    case PROP_ADAPTER:
-      g_value_set_uint (value, klass->adapter);
-      break;
-    case PROP_DEVICE_ID:
-      g_value_set_uint (value, klass->device_id);
-      break;
-    case PROP_VENDOR_ID:
-      g_value_set_uint (value, klass->vendor_id);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
+  gst_d3d11_decoder_proxy_get_property (object, prop_id, value, pspec, cdata);
 }
 
 static void
@@ -548,8 +495,9 @@ gst_d3d11_av1_dec_set_context (GstElement * element, GstContext * context)
 {
   GstD3D11AV1Dec *self = GST_D3D11_AV1_DEC (element);
   GstD3D11AV1DecClass *klass = GST_D3D11_AV1_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  gst_d3d11_handle_set_context (element, context, klass->adapter,
+  gst_d3d11_handle_set_context (element, context, cdata->adapter,
       &self->device);
 
   GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
@@ -560,8 +508,9 @@ gst_d3d11_av1_dec_open (GstVideoDecoder * decoder)
 {
   GstD3D11AV1Dec *self = GST_D3D11_AV1_DEC (decoder);
   GstD3D11AV1DecClass *klass = GST_D3D11_AV1_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), klass->adapter,
+  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), cdata->adapter,
           &self->device)) {
     GST_ERROR_OBJECT (self, "Cannot create d3d11device");
     return FALSE;
@@ -1470,7 +1419,8 @@ gst_d3d11_av1_dec_register (GstPlugin * plugin, GstD3D11Device * device,
       "height", GST_TYPE_INT_RANGE, 1, resolution, NULL);
 
   type_info.class_data =
-      gst_d3d11_decoder_class_data_new (device, sink_caps, src_caps);
+      gst_d3d11_decoder_class_data_new (device, GST_D3D11_CODEC_AV1,
+      sink_caps, src_caps);
 
   type_name = g_strdup ("GstD3D11AV1Dec");
   feature_name = g_strdup ("d3d11av1dec");
diff --git a/sys/d3d11/gstd3d11decoder.cpp b/sys/d3d11/gstd3d11decoder.cpp
index 3ae416bda..a9f59e4ad 100644
--- a/sys/d3d11/gstd3d11decoder.cpp
+++ b/sys/d3d11/gstd3d11decoder.cpp
@@ -55,6 +55,7 @@
 #include "gstd3d11converter.h"
 #include "gstd3d11pluginutils.h"
 #include <string.h>
+#include <string>
 
 #ifdef HAVE_WINMM
 #include <timeapi.h>
@@ -1941,6 +1942,22 @@ gst_d3d11_decoder_supports_resolution (GstD3D11Decoder * decoder,
   return TRUE;
 }
 
+enum
+{
+  PROP_DECODER_ADAPTER = 1,
+  PROP_DECODER_DEVICE_ID,
+  PROP_DECODER_VENDOR_ID,
+};
+
+struct _GstD3D11DecoderClassData
+{
+  GstD3D11DecoderSubClassData subclass_data;
+  GstCaps *sink_caps;
+  GstCaps *src_caps;
+  gchar *description;
+  GstD3D11Codec codec;
+};
+
 /**
  * gst_d3d11_decoder_class_data_new:
  * @device: (transfer none): a #GstD3D11Device
@@ -1952,7 +1969,7 @@ gst_d3d11_decoder_supports_resolution (GstD3D11Decoder * decoder,
  * Returns: (transfer full): the new #GstD3D11DecoderClassData
  */
 GstD3D11DecoderClassData *
-gst_d3d11_decoder_class_data_new (GstD3D11Device * device,
+gst_d3d11_decoder_class_data_new (GstD3D11Device * device, GstD3D11Codec codec,
     GstCaps * sink_caps, GstCaps * src_caps)
 {
   GstD3D11DecoderClassData *ret;
@@ -1963,13 +1980,16 @@ gst_d3d11_decoder_class_data_new (GstD3D11Device * device,
 
   ret = g_new0 (GstD3D11DecoderClassData, 1);
 
+  ret->codec = codec;
+
   /* class data will be leaked if the element never gets instantiated */
   GST_MINI_OBJECT_FLAG_SET (sink_caps, GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
   GST_MINI_OBJECT_FLAG_SET (src_caps, GST_MINI_OBJECT_FLAG_MAY_BE_LEAKED);
 
-  g_object_get (device, "adapter", &ret->adapter,
-      "device-id", &ret->device_id, "vendor-id", &ret->vendor_id,
-      "description", &ret->description, NULL);
+  g_object_get (device, "adapter", &ret->subclass_data.adapter,
+      "device-id", &ret->subclass_data.device_id,
+      "vendor-id", &ret->subclass_data.vendor_id,
+      "description", &ret->description, nullptr);
   ret->sink_caps = sink_caps;
   ret->src_caps = src_caps;
 
@@ -1977,6 +1997,16 @@ gst_d3d11_decoder_class_data_new (GstD3D11Device * device,
 }
 
 void
+gst_d3d11_decoder_class_data_fill_subclass_data (GstD3D11DecoderClassData *
+    data, GstD3D11DecoderSubClassData * subclass_data)
+{
+  g_return_if_fail (data != nullptr);
+  g_return_if_fail (subclass_data != nullptr);
+
+  *subclass_data = data->subclass_data;
+}
+
+static void
 gst_d3d11_decoder_class_data_free (GstD3D11DecoderClassData * data)
 {
   if (!data)
@@ -1987,3 +2017,69 @@ gst_d3d11_decoder_class_data_free (GstD3D11DecoderClassData * data)
   g_free (data->description);
   g_free (data);
 }
+
+void
+gst_d3d11_decoder_proxy_class_init (GstElementClass * klass,
+    GstD3D11DecoderClassData * data, const gchar * author)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstD3D11DecoderSubClassData *cdata = &data->subclass_data;
+  std::string long_name;
+  std::string description;
+  const gchar *codec_name;
+
+  g_object_class_install_property (gobject_class, PROP_DECODER_ADAPTER,
+      g_param_spec_uint ("adapter", "Adapter",
+          "DXGI Adapter index for creating device",
+          0, G_MAXUINT32, cdata->adapter,
+          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
+
+  g_object_class_install_property (gobject_class, PROP_DECODER_DEVICE_ID,
+      g_param_spec_uint ("device-id", "Device Id",
+          "DXGI Device ID", 0, G_MAXUINT32, 0,
+          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
+
+  g_object_class_install_property (gobject_class, PROP_DECODER_VENDOR_ID,
+      g_param_spec_uint ("vendor-id", "Vendor Id",
+          "DXGI Vendor ID", 0, G_MAXUINT32, 0,
+          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
+
+  codec_name = gst_d3d11_codec_to_string (data->codec);
+  long_name = "Direct3D11/DXVA " + std::string (codec_name) + " " +
+      std::string (data->description) + " Decoder";
+  description = "Direct3D11/DXVA based " + std::string (codec_name) +
+      " video decoder";
+
+  gst_element_class_set_metadata (klass, long_name.c_str (),
+      "Codec/Decoder/Video/Hardware", description.c_str (), author);
+
+  gst_element_class_add_pad_template (klass,
+      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+          data->sink_caps));
+  gst_element_class_add_pad_template (klass,
+      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+          data->src_caps));
+
+  gst_d3d11_decoder_class_data_free (data);
+}
+
+void
+gst_d3d11_decoder_proxy_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec,
+    GstD3D11DecoderSubClassData * subclass_data)
+{
+  switch (prop_id) {
+    case PROP_DECODER_ADAPTER:
+      g_value_set_uint (value, subclass_data->adapter);
+      break;
+    case PROP_DECODER_DEVICE_ID:
+      g_value_set_uint (value, subclass_data->device_id);
+      break;
+    case PROP_DECODER_VENDOR_ID:
+      g_value_set_uint (value, subclass_data->vendor_id);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
diff --git a/sys/d3d11/gstd3d11decoder.h b/sys/d3d11/gstd3d11decoder.h
index 7d49def4b..f7ec66131 100644
--- a/sys/d3d11/gstd3d11decoder.h
+++ b/sys/d3d11/gstd3d11decoder.h
@@ -30,7 +30,7 @@ G_BEGIN_DECLS
 G_DECLARE_FINAL_TYPE (GstD3D11Decoder,
     gst_d3d11_decoder, GST, D3D11_DECODER, GstObject);
 
-typedef struct _GstD3D11DecoderPrivate GstD3D11DecoderPrivate;
+typedef struct _GstD3D11DecoderClassData GstD3D11DecoderClassData;
 
 typedef enum
 {
@@ -48,13 +48,10 @@ typedef enum
 
 typedef struct
 {
-  GstCaps *sink_caps;
-  GstCaps *src_caps;
   guint adapter;
   guint device_id;
   guint vendor_id;
-  gchar *description;
-} GstD3D11DecoderClassData;
+} GstD3D11DecoderSubClassData;
 
 GstD3D11Decoder * gst_d3d11_decoder_new (GstD3D11Device * device);
 
@@ -130,11 +127,23 @@ gboolean          gst_d3d11_decoder_supports_resolution (GstD3D11Decoder * decod
                                                          guint width,
                                                          guint height);
 
-GstD3D11DecoderClassData * gst_d3d11_decoder_class_data_new (GstD3D11Device * device,
-                                                             GstCaps * sink_caps,
-                                                             GstCaps * src_caps);
+GstD3D11DecoderClassData *  gst_d3d11_decoder_class_data_new  (GstD3D11Device * device,
+                                                               GstD3D11Codec codec,
+                                                               GstCaps * sink_caps,
+                                                               GstCaps * src_caps);
 
-void              gst_d3d11_decoder_class_data_free (GstD3D11DecoderClassData * data);
+void  gst_d3d11_decoder_class_data_fill_subclass_data (GstD3D11DecoderClassData * data,
+                                                       GstD3D11DecoderSubClassData * subclass_data);
+
+void  gst_d3d11_decoder_proxy_class_init              (GstElementClass * klass,
+                                                       GstD3D11DecoderClassData * data,
+                                                       const gchar * author);
+
+void  gst_d3d11_decoder_proxy_get_property            (GObject * object,
+                                                       guint prop_id,
+                                                       GValue * value,
+                                                       GParamSpec * pspec,
+                                                       GstD3D11DecoderSubClassData * subclass_data);
 
 G_END_DECLS
 
diff --git a/sys/d3d11/gstd3d11h264dec.cpp b/sys/d3d11/gstd3d11h264dec.cpp
index f1a3d548f..5723fa2ac 100644
--- a/sys/d3d11/gstd3d11h264dec.cpp
+++ b/sys/d3d11/gstd3d11h264dec.cpp
@@ -82,14 +82,6 @@
 GST_DEBUG_CATEGORY_EXTERN (gst_d3d11_h264_dec_debug);
 #define GST_CAT_DEFAULT gst_d3d11_h264_dec_debug
 
-enum
-{
-  PROP_0,
-  PROP_ADAPTER,
-  PROP_DEVICE_ID,
-  PROP_VENDOR_ID,
-};
-
 typedef struct _GstD3D11H264Dec
 {
   GstH264Decoder parent;
@@ -125,9 +117,7 @@ typedef struct _GstD3D11H264Dec
 typedef struct _GstD3D11H264DecClass
 {
   GstH264DecoderClass parent_class;
-  guint adapter;
-  guint device_id;
-  guint vendor_id;
+  GstD3D11DecoderSubClassData class_data;
 } GstD3D11H264DecClass;
 
 static GstElementClass *parent_class = NULL;
@@ -179,49 +169,17 @@ gst_d3d11_h264_dec_class_init (GstD3D11H264DecClass * klass, gpointer data)
   GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
   GstH264DecoderClass *h264decoder_class = GST_H264_DECODER_CLASS (klass);
   GstD3D11DecoderClassData *cdata = (GstD3D11DecoderClassData *) data;
-  gchar *long_name;
 
   gobject_class->get_property = gst_d3d11_h264_dec_get_property;
   gobject_class->dispose = gst_d3d11_h264_dec_dispose;
 
-  g_object_class_install_property (gobject_class, PROP_ADAPTER,
-      g_param_spec_uint ("adapter", "Adapter",
-          "DXGI Adapter index for creating device",
-          0, G_MAXUINT32, cdata->adapter,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_DEVICE_ID,
-      g_param_spec_uint ("device-id", "Device Id",
-          "DXGI Device ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_VENDOR_ID,
-      g_param_spec_uint ("vendor-id", "Vendor Id",
-          "DXGI Vendor ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-
-  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
-
-  klass->adapter = cdata->adapter;
-  klass->device_id = cdata->device_id;
-  klass->vendor_id = cdata->vendor_id;
-
   element_class->set_context =
       GST_DEBUG_FUNCPTR (gst_d3d11_h264_dec_set_context);
 
-  long_name = g_strdup_printf ("Direct3D11/DXVA H.264 %s Decoder",
-      cdata->description);
-  gst_element_class_set_metadata (element_class, long_name,
-      "Codec/Decoder/Video/Hardware",
-      "A Direct3D11/DXVA H.264 video decoder",
+  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
+  gst_d3d11_decoder_class_data_fill_subclass_data (cdata, &klass->class_data);
+  gst_d3d11_decoder_proxy_class_init (element_class, cdata,
       "Seungha Yang <seungha.yang@navercorp.com>");
-  g_free (long_name);
-
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
-          cdata->sink_caps));
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
-          cdata->src_caps));
-  gst_d3d11_decoder_class_data_free (cdata);
 
   decoder_class->open = GST_DEBUG_FUNCPTR (gst_d3d11_h264_dec_open);
   decoder_class->close = GST_DEBUG_FUNCPTR (gst_d3d11_h264_dec_close);
@@ -258,21 +216,9 @@ gst_d3d11_h264_dec_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstD3D11H264DecClass *klass = GST_D3D11_H264_DEC_GET_CLASS (object);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  switch (prop_id) {
-    case PROP_ADAPTER:
-      g_value_set_uint (value, klass->adapter);
-      break;
-    case PROP_DEVICE_ID:
-      g_value_set_uint (value, klass->device_id);
-      break;
-    case PROP_VENDOR_ID:
-      g_value_set_uint (value, klass->vendor_id);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
+  gst_d3d11_decoder_proxy_get_property (object, prop_id, value, pspec, cdata);
 }
 
 static void
@@ -293,8 +239,9 @@ gst_d3d11_h264_dec_set_context (GstElement * element, GstContext * context)
 {
   GstD3D11H264Dec *self = GST_D3D11_H264_DEC (element);
   GstD3D11H264DecClass *klass = GST_D3D11_H264_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  gst_d3d11_handle_set_context (element, context, klass->adapter,
+  gst_d3d11_handle_set_context (element, context, cdata->adapter,
       &self->device);
 
   GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
@@ -320,8 +267,9 @@ gst_d3d11_h264_dec_open (GstVideoDecoder * decoder)
 {
   GstD3D11H264Dec *self = GST_D3D11_H264_DEC (decoder);
   GstD3D11H264DecClass *klass = GST_D3D11_H264_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), klass->adapter,
+  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), cdata->adapter,
           &self->device)) {
     GST_ERROR_OBJECT (self, "Cannot create d3d11device");
     return FALSE;
@@ -1301,7 +1249,8 @@ gst_d3d11_h264_dec_register (GstPlugin * plugin, GstD3D11Device * device,
       "height", GST_TYPE_INT_RANGE, 1, resolution, NULL);
 
   type_info.class_data =
-      gst_d3d11_decoder_class_data_new (device, sink_caps, src_caps);
+      gst_d3d11_decoder_class_data_new (device, GST_D3D11_CODEC_H264,
+      sink_caps, src_caps);
 
   type_name = g_strdup ("GstD3D11H264Dec");
   feature_name = g_strdup ("d3d11h264dec");
diff --git a/sys/d3d11/gstd3d11h265dec.cpp b/sys/d3d11/gstd3d11h265dec.cpp
index 00826bfaf..3a8a37b21 100644
--- a/sys/d3d11/gstd3d11h265dec.cpp
+++ b/sys/d3d11/gstd3d11h265dec.cpp
@@ -52,14 +52,6 @@
 GST_DEBUG_CATEGORY_EXTERN (gst_d3d11_h265_dec_debug);
 #define GST_CAT_DEFAULT gst_d3d11_h265_dec_debug
 
-enum
-{
-  PROP_0,
-  PROP_ADAPTER,
-  PROP_DEVICE_ID,
-  PROP_VENDOR_ID,
-};
-
 typedef struct _GstD3D11H265Dec
 {
   GstH265Decoder parent;
@@ -95,9 +87,7 @@ typedef struct _GstD3D11H265Dec
 typedef struct _GstD3D11H265DecClass
 {
   GstH265DecoderClass parent_class;
-  guint adapter;
-  guint device_id;
-  guint vendor_id;
+  GstD3D11DecoderSubClassData class_data;
 } GstD3D11H265DecClass;
 
 static GstElementClass *parent_class = NULL;
@@ -153,49 +143,17 @@ gst_d3d11_h265_dec_class_init (GstD3D11H265DecClass * klass, gpointer data)
   GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
   GstH265DecoderClass *h265decoder_class = GST_H265_DECODER_CLASS (klass);
   GstD3D11DecoderClassData *cdata = (GstD3D11DecoderClassData *) data;
-  gchar *long_name;
 
   gobject_class->get_property = gst_d3d11_h265_dec_get_property;
   gobject_class->dispose = gst_d3d11_h265_dec_dispose;
 
-  g_object_class_install_property (gobject_class, PROP_ADAPTER,
-      g_param_spec_uint ("adapter", "Adapter",
-          "DXGI Adapter index for creating device",
-          0, G_MAXUINT32, cdata->adapter,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_DEVICE_ID,
-      g_param_spec_uint ("device-id", "Device Id",
-          "DXGI Device ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_VENDOR_ID,
-      g_param_spec_uint ("vendor-id", "Vendor Id",
-          "DXGI Vendor ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-
-  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
-
-  klass->adapter = cdata->adapter;
-  klass->device_id = cdata->device_id;
-  klass->vendor_id = cdata->vendor_id;
-
   element_class->set_context =
       GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_set_context);
 
-  long_name = g_strdup_printf ("Direct3D11/DXVA H.265 %s Decoder",
-      cdata->description);
-  gst_element_class_set_metadata (element_class, long_name,
-      "Codec/Decoder/Video/Hardware",
-      "A Direct3D11/DXVA H.265 video decoder",
+  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
+  gst_d3d11_decoder_class_data_fill_subclass_data (cdata, &klass->class_data);
+  gst_d3d11_decoder_proxy_class_init (element_class, cdata,
       "Seungha Yang <seungha.yang@navercorp.com>");
-  g_free (long_name);
-
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
-          cdata->sink_caps));
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
-          cdata->src_caps));
-  gst_d3d11_decoder_class_data_free (cdata);
 
   decoder_class->open = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_open);
   decoder_class->close = GST_DEBUG_FUNCPTR (gst_d3d11_h265_dec_close);
@@ -230,21 +188,9 @@ gst_d3d11_h265_dec_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstD3D11H265DecClass *klass = GST_D3D11_H265_DEC_GET_CLASS (object);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  switch (prop_id) {
-    case PROP_ADAPTER:
-      g_value_set_uint (value, klass->adapter);
-      break;
-    case PROP_DEVICE_ID:
-      g_value_set_uint (value, klass->device_id);
-      break;
-    case PROP_VENDOR_ID:
-      g_value_set_uint (value, klass->vendor_id);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
+  gst_d3d11_decoder_proxy_get_property (object, prop_id, value, pspec, cdata);
 }
 
 static void
@@ -265,8 +211,9 @@ gst_d3d11_h265_dec_set_context (GstElement * element, GstContext * context)
 {
   GstD3D11H265Dec *self = GST_D3D11_H265_DEC (element);
   GstD3D11H265DecClass *klass = GST_D3D11_H265_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  gst_d3d11_handle_set_context (element, context, klass->adapter,
+  gst_d3d11_handle_set_context (element, context, cdata->adapter,
       &self->device);
 
   GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
@@ -277,8 +224,9 @@ gst_d3d11_h265_dec_open (GstVideoDecoder * decoder)
 {
   GstD3D11H265Dec *self = GST_D3D11_H265_DEC (decoder);
   GstD3D11H265DecClass *klass = GST_D3D11_H265_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), klass->adapter,
+  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), cdata->adapter,
           &self->device)) {
     GST_ERROR_OBJECT (self, "Cannot create d3d11device");
     return FALSE;
@@ -1527,7 +1475,8 @@ gst_d3d11_h265_dec_register (GstPlugin * plugin, GstD3D11Device * device,
   gst_caps_unref (src_caps_copy);
 
   type_info.class_data =
-      gst_d3d11_decoder_class_data_new (device, sink_caps, src_caps);
+      gst_d3d11_decoder_class_data_new (device, GST_D3D11_CODEC_H265,
+      sink_caps, src_caps);
 
   type_name = g_strdup ("GstD3D11H265Dec");
   feature_name = g_strdup ("d3d11h265dec");
diff --git a/sys/d3d11/gstd3d11mpeg2dec.cpp b/sys/d3d11/gstd3d11mpeg2dec.cpp
index 8a6ceed73..b1e1b8ba1 100644
--- a/sys/d3d11/gstd3d11mpeg2dec.cpp
+++ b/sys/d3d11/gstd3d11mpeg2dec.cpp
@@ -52,14 +52,6 @@
 GST_DEBUG_CATEGORY_EXTERN (gst_d3d11_mpeg2_dec_debug);
 #define GST_CAT_DEFAULT gst_d3d11_mpeg2_dec_debug
 
-enum
-{
-  PROP_0,
-  PROP_ADAPTER,
-  PROP_DEVICE_ID,
-  PROP_VENDOR_ID,
-};
-
 /* reference list 2 + 4 margin */
 #define NUM_OUTPUT_VIEW 6
 
@@ -90,9 +82,7 @@ typedef struct _GstD3D11Mpeg2Dec
 typedef struct _GstD3D11Mpeg2DecClass
 {
   GstMpeg2DecoderClass parent_class;
-  guint adapter;
-  guint device_id;
-  guint vendor_id;
+  GstD3D11DecoderSubClassData class_data;
 } GstD3D11Mpeg2DecClass;
 
 static GstElementClass *parent_class = NULL;
@@ -146,48 +136,17 @@ gst_d3d11_mpeg2_dec_class_init (GstD3D11Mpeg2DecClass * klass, gpointer data)
   GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
   GstMpeg2DecoderClass *mpeg2decoder_class = GST_MPEG2_DECODER_CLASS (klass);
   GstD3D11DecoderClassData *cdata = (GstD3D11DecoderClassData *) data;
-  gchar *long_name;
 
   gobject_class->get_property = gst_d3d11_mpeg2_dec_get_property;
   gobject_class->finalize = gst_d3d11_mpeg2_dec_finalize;
 
-  g_object_class_install_property (gobject_class, PROP_ADAPTER,
-      g_param_spec_uint ("adapter", "Adapter",
-          "DXGI Adapter index for creating device",
-          0, G_MAXUINT32, cdata->adapter,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_DEVICE_ID,
-      g_param_spec_uint ("device-id", "Device Id",
-          "DXGI Device ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_VENDOR_ID,
-      g_param_spec_uint ("vendor-id", "Vendor Id",
-          "DXGI Vendor ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-
-  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
-
-  klass->adapter = cdata->adapter;
-  klass->device_id = cdata->device_id;
-  klass->vendor_id = cdata->vendor_id;
-
   element_class->set_context =
       GST_DEBUG_FUNCPTR (gst_d3d11_mpeg2_dec_set_context);
 
-  long_name =
-      g_strdup_printf ("Direct3D11/DXVA MPEG2 %s Decoder", cdata->description);
-  gst_element_class_set_metadata (element_class, long_name,
-      "Codec/Decoder/Video/Hardware", "A Direct3D11/DXVA MPEG2 video decoder",
+  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
+  gst_d3d11_decoder_class_data_fill_subclass_data (cdata, &klass->class_data);
+  gst_d3d11_decoder_proxy_class_init (element_class, cdata,
       "Seungha Yang <seungha@centricular.com>");
-  g_free (long_name);
-
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
-          cdata->sink_caps));
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
-          cdata->src_caps));
-  gst_d3d11_decoder_class_data_free (cdata);
 
   decoder_class->open = GST_DEBUG_FUNCPTR (gst_d3d11_mpeg2_dec_open);
   decoder_class->close = GST_DEBUG_FUNCPTR (gst_d3d11_mpeg2_dec_close);
@@ -236,21 +195,9 @@ gst_d3d11_mpeg2_dec_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstD3D11Mpeg2DecClass *klass = GST_D3D11_MPEG2_DEC_GET_CLASS (object);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  switch (prop_id) {
-    case PROP_ADAPTER:
-      g_value_set_uint (value, klass->adapter);
-      break;
-    case PROP_DEVICE_ID:
-      g_value_set_uint (value, klass->device_id);
-      break;
-    case PROP_VENDOR_ID:
-      g_value_set_uint (value, klass->vendor_id);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
+  gst_d3d11_decoder_proxy_get_property (object, prop_id, value, pspec, cdata);
 }
 
 static void
@@ -258,8 +205,9 @@ gst_d3d11_mpeg2_dec_set_context (GstElement * element, GstContext * context)
 {
   GstD3D11Mpeg2Dec *self = GST_D3D11_MPEG2_DEC (element);
   GstD3D11Mpeg2DecClass *klass = GST_D3D11_MPEG2_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  gst_d3d11_handle_set_context (element, context, klass->adapter,
+  gst_d3d11_handle_set_context (element, context, cdata->adapter,
       &self->device);
 
   GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
@@ -270,8 +218,9 @@ gst_d3d11_mpeg2_dec_open (GstVideoDecoder * decoder)
 {
   GstD3D11Mpeg2Dec *self = GST_D3D11_MPEG2_DEC (decoder);
   GstD3D11Mpeg2DecClass *klass = GST_D3D11_MPEG2_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), klass->adapter,
+  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), cdata->adapter,
           &self->device)) {
     GST_ERROR_OBJECT (self, "Cannot create d3d11device");
     return FALSE;
@@ -997,7 +946,8 @@ gst_d3d11_mpeg2_dec_register (GstPlugin * plugin, GstD3D11Device * device,
       "height", GST_TYPE_INT_RANGE, 1, 1920, NULL);
 
   type_info.class_data =
-      gst_d3d11_decoder_class_data_new (device, sink_caps, src_caps);
+      gst_d3d11_decoder_class_data_new (device, GST_D3D11_CODEC_MPEG2,
+      sink_caps, src_caps);
 
   type_name = g_strdup ("GstD3D11Mpeg2Dec");
   feature_name = g_strdup ("d3d11mpeg2dec");
diff --git a/sys/d3d11/gstd3d11vp8dec.cpp b/sys/d3d11/gstd3d11vp8dec.cpp
index fd6c00e22..cdb2761a5 100644
--- a/sys/d3d11/gstd3d11vp8dec.cpp
+++ b/sys/d3d11/gstd3d11vp8dec.cpp
@@ -52,14 +52,6 @@
 GST_DEBUG_CATEGORY_EXTERN (gst_d3d11_vp8_dec_debug);
 #define GST_CAT_DEFAULT gst_d3d11_vp8_dec_debug
 
-enum
-{
-  PROP_0,
-  PROP_ADAPTER,
-  PROP_DEVICE_ID,
-  PROP_VENDOR_ID,
-};
-
 /* reference list 4 + 4 margin */
 #define NUM_OUTPUT_VIEW 8
 
@@ -77,9 +69,7 @@ typedef struct _GstD3D11Vp8Dec
 typedef struct _GstD3D11Vp8DecClass
 {
   GstVp8DecoderClass parent_class;
-  guint adapter;
-  guint device_id;
-  guint vendor_id;
+  GstD3D11DecoderSubClassData class_data;
 } GstD3D11Vp8DecClass;
 
 static GstElementClass *parent_class = NULL;
@@ -125,47 +115,16 @@ gst_d3d11_vp8_dec_class_init (GstD3D11Vp8DecClass * klass, gpointer data)
   GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
   GstVp8DecoderClass *vp8decoder_class = GST_VP8_DECODER_CLASS (klass);
   GstD3D11DecoderClassData *cdata = (GstD3D11DecoderClassData *) data;
-  gchar *long_name;
 
   gobject_class->get_property = gst_d3d11_vp8_dec_get_property;
 
-  g_object_class_install_property (gobject_class, PROP_ADAPTER,
-      g_param_spec_uint ("adapter", "Adapter",
-          "DXGI Adapter index for creating device",
-          0, G_MAXUINT32, cdata->adapter,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_DEVICE_ID,
-      g_param_spec_uint ("device-id", "Device Id",
-          "DXGI Device ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_VENDOR_ID,
-      g_param_spec_uint ("vendor-id", "Vendor Id",
-          "DXGI Vendor ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-
-  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
-
-  klass->adapter = cdata->adapter;
-  klass->device_id = cdata->device_id;
-  klass->vendor_id = cdata->vendor_id;
-
   element_class->set_context =
       GST_DEBUG_FUNCPTR (gst_d3d11_vp8_dec_set_context);
 
-  long_name =
-      g_strdup_printf ("Direct3D11/DXVA VP8 %s Decoder", cdata->description);
-  gst_element_class_set_metadata (element_class, long_name,
-      "Codec/Decoder/Video/Hardware", "A Direct3D11/DXVA VP8 video decoder",
+  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
+  gst_d3d11_decoder_class_data_fill_subclass_data (cdata, &klass->class_data);
+  gst_d3d11_decoder_proxy_class_init (element_class, cdata,
       "Seungha Yang <seungha.yang@navercorp.com>");
-  g_free (long_name);
-
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
-          cdata->sink_caps));
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
-          cdata->src_caps));
-  gst_d3d11_decoder_class_data_free (cdata);
 
   decoder_class->open = GST_DEBUG_FUNCPTR (gst_d3d11_vp8_dec_open);
   decoder_class->close = GST_DEBUG_FUNCPTR (gst_d3d11_vp8_dec_close);
@@ -199,21 +158,9 @@ gst_d3d11_vp8_dec_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstD3D11Vp8DecClass *klass = GST_D3D11_VP8_DEC_GET_CLASS (object);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  switch (prop_id) {
-    case PROP_ADAPTER:
-      g_value_set_uint (value, klass->adapter);
-      break;
-    case PROP_DEVICE_ID:
-      g_value_set_uint (value, klass->device_id);
-      break;
-    case PROP_VENDOR_ID:
-      g_value_set_uint (value, klass->vendor_id);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
+  gst_d3d11_decoder_proxy_get_property (object, prop_id, value, pspec, cdata);
 }
 
 static void
@@ -221,8 +168,9 @@ gst_d3d11_vp8_dec_set_context (GstElement * element, GstContext * context)
 {
   GstD3D11Vp8Dec *self = GST_D3D11_VP8_DEC (element);
   GstD3D11Vp8DecClass *klass = GST_D3D11_VP8_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  gst_d3d11_handle_set_context (element, context, klass->adapter,
+  gst_d3d11_handle_set_context (element, context, cdata->adapter,
       &self->device);
 
   GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
@@ -233,8 +181,9 @@ gst_d3d11_vp8_dec_open (GstVideoDecoder * decoder)
 {
   GstD3D11Vp8Dec *self = GST_D3D11_VP8_DEC (decoder);
   GstD3D11Vp8DecClass *klass = GST_D3D11_VP8_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), klass->adapter,
+  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), cdata->adapter,
           &self->device)) {
     GST_ERROR_OBJECT (self, "Cannot create d3d11device");
     return FALSE;
@@ -894,7 +843,8 @@ gst_d3d11_vp8_dec_register (GstPlugin * plugin, GstD3D11Device * device,
       "height", GST_TYPE_INT_RANGE, 1, resolution, NULL);
 
   type_info.class_data =
-      gst_d3d11_decoder_class_data_new (device, sink_caps, src_caps);
+      gst_d3d11_decoder_class_data_new (device, GST_D3D11_CODEC_VP8,
+      sink_caps, src_caps);
 
   type_name = g_strdup ("GstD3D11Vp8Dec");
   feature_name = g_strdup ("d3d11vp8dec");
diff --git a/sys/d3d11/gstd3d11vp9dec.cpp b/sys/d3d11/gstd3d11vp9dec.cpp
index 09c15bfab..a769c21d1 100644
--- a/sys/d3d11/gstd3d11vp9dec.cpp
+++ b/sys/d3d11/gstd3d11vp9dec.cpp
@@ -82,14 +82,6 @@
 GST_DEBUG_CATEGORY_EXTERN (gst_d3d11_vp9_dec_debug);
 #define GST_CAT_DEFAULT gst_d3d11_vp9_dec_debug
 
-enum
-{
-  PROP_0,
-  PROP_ADAPTER,
-  PROP_DEVICE_ID,
-  PROP_VENDOR_ID,
-};
-
 /* reference list 8 + 4 margin */
 #define NUM_OUTPUT_VIEW 12
 
@@ -109,9 +101,7 @@ typedef struct _GstD3D11Vp9Dec
 typedef struct _GstD3D11Vp9DecClass
 {
   GstVp9DecoderClass parent_class;
-  guint adapter;
-  guint device_id;
-  guint vendor_id;
+  GstD3D11DecoderSubClassData class_data;
 } GstD3D11Vp9DecClass;
 
 static GstElementClass *parent_class = NULL;
@@ -159,47 +149,16 @@ gst_d3d11_vp9_dec_class_init (GstD3D11Vp9DecClass * klass, gpointer data)
   GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
   GstVp9DecoderClass *vp9decoder_class = GST_VP9_DECODER_CLASS (klass);
   GstD3D11DecoderClassData *cdata = (GstD3D11DecoderClassData *) data;
-  gchar *long_name;
 
   gobject_class->get_property = gst_d3d11_vp9_dec_get_property;
 
-  g_object_class_install_property (gobject_class, PROP_ADAPTER,
-      g_param_spec_uint ("adapter", "Adapter",
-          "DXGI Adapter index for creating device",
-          0, G_MAXUINT32, cdata->adapter,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_DEVICE_ID,
-      g_param_spec_uint ("device-id", "Device Id",
-          "DXGI Device ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-  g_object_class_install_property (gobject_class, PROP_VENDOR_ID,
-      g_param_spec_uint ("vendor-id", "Vendor Id",
-          "DXGI Vendor ID", 0, G_MAXUINT32, 0,
-          (GParamFlags) (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)));
-
-  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
-
-  klass->adapter = cdata->adapter;
-  klass->device_id = cdata->device_id;
-  klass->vendor_id = cdata->vendor_id;
-
   element_class->set_context =
       GST_DEBUG_FUNCPTR (gst_d3d11_vp9_dec_set_context);
 
-  long_name =
-      g_strdup_printf ("Direct3D11/DXVA VP9 %s Decoder", cdata->description);
-  gst_element_class_set_metadata (element_class, long_name,
-      "Codec/Decoder/Video/Hardware", "A Direct3D11/DXVA VP9 video decoder",
+  parent_class = (GstElementClass *) g_type_class_peek_parent (klass);
+  gst_d3d11_decoder_class_data_fill_subclass_data (cdata, &klass->class_data);
+  gst_d3d11_decoder_proxy_class_init (element_class, cdata,
       "Seungha Yang <seungha.yang@navercorp.com>");
-  g_free (long_name);
-
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
-          cdata->sink_caps));
-  gst_element_class_add_pad_template (element_class,
-      gst_pad_template_new ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
-          cdata->src_caps));
-  gst_d3d11_decoder_class_data_free (cdata);
 
   decoder_class->open = GST_DEBUG_FUNCPTR (gst_d3d11_vp9_dec_open);
   decoder_class->close = GST_DEBUG_FUNCPTR (gst_d3d11_vp9_dec_close);
@@ -235,21 +194,9 @@ gst_d3d11_vp9_dec_get_property (GObject * object, guint prop_id,
     GValue * value, GParamSpec * pspec)
 {
   GstD3D11Vp9DecClass *klass = GST_D3D11_VP9_DEC_GET_CLASS (object);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  switch (prop_id) {
-    case PROP_ADAPTER:
-      g_value_set_uint (value, klass->adapter);
-      break;
-    case PROP_DEVICE_ID:
-      g_value_set_uint (value, klass->device_id);
-      break;
-    case PROP_VENDOR_ID:
-      g_value_set_uint (value, klass->vendor_id);
-      break;
-    default:
-      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
-      break;
-  }
+  gst_d3d11_decoder_proxy_get_property (object, prop_id, value, pspec, cdata);
 }
 
 static void
@@ -257,8 +204,9 @@ gst_d3d11_vp9_dec_set_context (GstElement * element, GstContext * context)
 {
   GstD3D11Vp9Dec *self = GST_D3D11_VP9_DEC (element);
   GstD3D11Vp9DecClass *klass = GST_D3D11_VP9_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  gst_d3d11_handle_set_context (element, context, klass->adapter,
+  gst_d3d11_handle_set_context (element, context, cdata->adapter,
       &self->device);
 
   GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
@@ -269,8 +217,9 @@ gst_d3d11_vp9_dec_open (GstVideoDecoder * decoder)
 {
   GstD3D11Vp9Dec *self = GST_D3D11_VP9_DEC (decoder);
   GstD3D11Vp9DecClass *klass = GST_D3D11_VP9_DEC_GET_CLASS (self);
+  GstD3D11DecoderSubClassData *cdata = &klass->class_data;
 
-  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), klass->adapter,
+  if (!gst_d3d11_ensure_element_data (GST_ELEMENT_CAST (self), cdata->adapter,
           &self->device)) {
     GST_ERROR_OBJECT (self, "Cannot create d3d11device");
     return FALSE;
@@ -1093,7 +1042,8 @@ gst_d3d11_vp9_dec_register (GstPlugin * plugin, GstD3D11Device * device,
       "height", GST_TYPE_INT_RANGE, 1, resolution, NULL);
 
   type_info.class_data =
-      gst_d3d11_decoder_class_data_new (device, sink_caps, src_caps);
+      gst_d3d11_decoder_class_data_new (device, GST_D3D11_CODEC_VP9,
+      sink_caps, src_caps);
 
   type_name = g_strdup ("GstD3D11Vp9Dec");
   feature_name = g_strdup ("d3d11vp9dec");