d3d11: Add support for MPEG-2 video decoding

Add DXVA/Direct3D11 API based MPEG-2 decoder element

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1969>

sys/d3d11/gstd3d11decoder.c

@@ -627,6 +627,10 @@ gst_d3d11_decoder_open (GstD3D11Decoder * decoder, GstD3D11Codec codec,
       else
         alignment = 16;
       break;
+    case GST_D3D11_CODEC_MPEG2:
+      /* XXX: ffmpeg does this */
+      alignment = 32;
+      break;
     default:
       alignment = 16;
       break;
@@ -676,6 +680,7 @@ gst_d3d11_decoder_open (GstD3D11Decoder * decoder, GstD3D11Codec codec,
       case GST_D3D11_CODEC_H265:
       case GST_D3D11_CODEC_VP9:
       case GST_D3D11_CODEC_VP8:
+      case GST_D3D11_CODEC_MPEG2:
         if (config_list[i].ConfigBitstreamRaw == 1)
           best_config = &config_list[i];
         break;

sys/d3d11/gstd3d11decoder.h

@@ -39,6 +39,7 @@ typedef enum
   GST_D3D11_CODEC_VP9,
   GST_D3D11_CODEC_H265,
   GST_D3D11_CODEC_VP8,
+  GST_D3D11_CODEC_MPEG2,
 
   /* the last of supported codec */
   GST_D3D11_CODEC_LAST

sys/d3d11/gstd3d11mpeg2dec.h

@@ -0,0 +1,34 @@
+/* GStreamer
+ * Copyright (C) 2021 Seungha Yang <seungha@centricular.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_D3D11_MPEG2_DEC_H__
+#define __GST_D3D11_MPEG2_DEC_H__
+
+#include "gstd3d11decoder.h"
+
+G_BEGIN_DECLS
+
+void  gst_d3d11_mpeg2_dec_register (GstPlugin * plugin,
+                                    GstD3D11Device * device,
+                                    GstD3D11Decoder * decoder,
+                                    guint rank);
+
+G_END_DECLS
+
+#endif /* __GST_D3D11_MPEG2_DEC_H__ */

sys/d3d11/meson.build

@@ -21,6 +21,7 @@ d3d11_dec_sources = [
   'gstd3d11h264dec.c',
   'gstd3d11vp9dec.c',
   'gstd3d11h265dec.c',
+  'gstd3d11mpeg2dec.c',
   'gstd3d11vp8dec.c',
 ]
 

sys/d3d11/plugin.c

@@ -36,6 +36,7 @@
 #include "gstd3d11h265dec.h"
 #include "gstd3d11vp9dec.h"
 #include "gstd3d11vp8dec.h"
+#include "gstd3d11mpeg2dec.h"
 #endif
 #ifdef HAVE_DXGI_DESKTOP_DUP
 #include "gstd3d11desktopdupsrc.h"
@@ -57,6 +58,7 @@ GST_DEBUG_CATEGORY (gst_d3d11_h264_dec_debug);
 GST_DEBUG_CATEGORY (gst_d3d11_h265_dec_debug);
 GST_DEBUG_CATEGORY (gst_d3d11_vp9_dec_debug);
 GST_DEBUG_CATEGORY (gst_d3d11_vp8_dec_debug);
+GST_DEBUG_CATEGORY (gst_d3d11_mpeg2_dec_debug);
 #endif
 
 #ifdef HAVE_DXGI_DESKTOP_DUP
@@ -109,6 +111,8 @@ plugin_init (GstPlugin * plugin)
         "d3d11h265dec", 0, "Direct3D11 H.265 Video Decoder");
     GST_DEBUG_CATEGORY_INIT (gst_d3d11_vp8_dec_debug,
         "d3d11vp8dec", 0, "Direct3D11 VP8 Decoder");
+    GST_DEBUG_CATEGORY_INIT (gst_d3d11_mpeg2_dec_debug,
+        "d3d11mpeg2dec", 0, "Direct3D11 MPEG2 Decoder");
   }
 #endif
 
@@ -156,6 +160,8 @@ plugin_init (GstPlugin * plugin)
             GST_RANK_SECONDARY);
         gst_d3d11_vp8_dec_register (plugin, device, decoder,
             GST_RANK_SECONDARY);
+        gst_d3d11_mpeg2_dec_register (plugin, device, decoder,
+            GST_RANK_SECONDARY);
       }
 
     done: