msdkallocator_d3d: add d3d11 video memory and import it to msdk surface

This patch introduces d3d11 texture and index to GstMsdkMemoryID and
implements gst_msdk_import_to_msdk_surface in order to wrap the surface
to mfxMemId.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3231>

subprojects/gst-plugins-bad/sys/msdk/gstmsdkallocator.h

@@ -49,9 +49,8 @@ struct _GstMsdkMemoryID {
   VAImage image;
   VADRMPRIMESurfaceDescriptor desc;
 #else
-  /* TODO: This is just to avoid compile errors on Windows.
+  ID3D11Texture2D *texture;
-   * Implement handling Windows-specific video-memory.
+  guint subresource_index;
-   */
   gint pitch;
   guint offset;
 #endif

subprojects/gst-plugins-bad/sys/msdk/gstmsdkallocator_d3d.c

@@ -30,8 +30,22 @@
  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <gst/d3d11/gstd3d11.h>
 #include "gstmsdkallocator.h"
 
+#define GST_MSDK_FRAME_SURFACE gst_msdk_frame_surface_quark_get ()
+static GQuark
+gst_msdk_frame_surface_quark_get (void)
+{
+  static gsize g_quark;
+
+  if (g_once_init_enter (&g_quark)) {
+    gsize quark = (gsize) g_quark_from_static_string ("GstMsdkFrameSurface");
+    g_once_init_leave (&g_quark, quark);
+  }
+  return g_quark;
+}
+
 mfxStatus
 gst_msdk_frame_alloc (mfxHDL pthis, mfxFrameAllocRequest * req,
     mfxFrameAllocResponse * resp)
@@ -74,6 +88,62 @@ gst_msdk_frame_get_hdl (mfxHDL pthis, mfxMemId mid, mfxHDL * hdl)
   return MFX_ERR_NONE;
 }
 
+GstMsdkSurface *
+gst_msdk_import_to_msdk_surface (GstBuffer * buf, GstMsdkContext * msdk_context,
+    GstVideoInfo * vinfo, guint map_flag)
+{
+  GstMemory *mem = NULL;
+  mfxFrameInfo frame_info = { 0, };
+  GstMsdkSurface *msdk_surface = NULL;
+  mfxFrameSurface1 *mfx_surface = NULL;
+  GstMsdkMemoryID *msdk_mid = NULL;
+  GstMapInfo map_info;
+
+  mem = gst_buffer_peek_memory (buf, 0);
+  msdk_surface = g_slice_new0 (GstMsdkSurface);
+
+  if (!gst_is_d3d11_memory (mem) || gst_buffer_n_memory (buf) > 1) {
+    /* d3d11 buffer should hold single memory object */
+    g_slice_free (GstMsdkSurface, msdk_surface);
+    return NULL;
+  }
+
+  if (!gst_buffer_map (buf, &map_info, map_flag | GST_MAP_D3D11)) {
+    GST_ERROR ("Failed to map buffer");
+    g_slice_free (GstMsdkSurface, msdk_surface);
+    return NULL;
+  }
+
+  /* If buffer has qdata pointing to mfxFrameSurface1, directly extract it */
+  if ((mfx_surface = gst_mini_object_get_qdata (GST_MINI_OBJECT_CAST (mem),
+              GST_MSDK_FRAME_SURFACE))) {
+    msdk_surface->from_qdata = TRUE;
+    msdk_surface->surface = mfx_surface;
+    gst_buffer_unmap (buf, &map_info);
+    return msdk_surface;
+  }
+
+  mfx_surface = g_slice_new0 (mfxFrameSurface1);
+  msdk_mid = g_slice_new0 (GstMsdkMemoryID);
+  mfx_surface->Data.MemId = (mfxMemId) msdk_mid;
+
+  msdk_mid->texture = (ID3D11Texture2D *) (gpointer) map_info.data;
+  msdk_mid->subresource_index = GPOINTER_TO_UINT (map_info.user_data[0]);
+
+  gst_buffer_unmap (buf, &map_info);
+
+  gst_msdk_set_mfx_frame_info_from_video_info (&frame_info, vinfo);
+  mfx_surface->Info = frame_info;
+
+  /* Set mfxFrameSurface1 as qdata in buffer */
+  gst_mini_object_set_qdata (GST_MINI_OBJECT_CAST (mem),
+      GST_MSDK_FRAME_SURFACE, mfx_surface, NULL);
+
+  msdk_surface->surface = mfx_surface;
+
+  return msdk_surface;
+}
+
 void
 gst_msdk_set_frame_allocator (GstMsdkContext * context)
 {

subprojects/gst-plugins-bad/sys/msdk/gstmsdkenc.c

@@ -1684,14 +1684,13 @@ gst_msdkenc_get_surface_from_frame (GstMsdkEnc * thiz,
     msdk_surface->surface = gst_msdk_get_surface_from_buffer (inbuf);
     return msdk_surface;
   }
-#ifndef _WIN32
+
   msdk_surface = gst_msdk_import_to_msdk_surface (inbuf, thiz->context,
-      &thiz->input_state->info, 0);
+      &thiz->input_state->info, GST_MAP_READ);
   if (msdk_surface) {
     msdk_surface->buf = gst_buffer_ref (inbuf);
     return msdk_surface;
   }
-#endif
 
   /* If upstream hasn't accpeted the proposed msdk bufferpool,
    * just copy frame to msdk buffer and take a surface from it.