MSDK: Use the VA display object to replace the raw display handle.

The VA display object from VA lib is a common defined object. which
contain the whole display things. It is easier to use, and more important,
we can share it with the other VA plugins and keep all the VA related
plugins working on the same GPU device.
We also delete the useless gst_msdk_context_get_fd() API.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1087>

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

@@ -37,6 +37,7 @@
 #include <xf86drm.h>
 #include <va/va_drm.h>
 #include <gudev/gudev.h>
+#include <gst/va/gstvadisplay_drm.h>
 #endif
 
 GST_DEBUG_CATEGORY_STATIC (gst_debug_msdkcontext);
@@ -54,8 +55,7 @@ struct _GstMsdkContextPrivate
   GList *child_session_list;
   GstMsdkContext *parent_context;
 #ifndef _WIN32
-  gint fd;
+  GstVaDisplay *display;
-  VADisplay dpy;
 #endif
 };
 
@@ -67,8 +67,8 @@ G_DEFINE_TYPE_WITH_CODE (GstMsdkContext, gst_msdk_context, GST_TYPE_OBJECT,
 
 #ifndef _WIN32
 
-static gint
+static char *
-get_device_id (void)
+get_device_path (void)
 {
   GUdevClient *client = NULL;
   GUdevEnumerator *e = NULL;
@@ -78,6 +78,7 @@ get_device_id (void)
   const gchar *devnode_files[2] = { "renderD[0-9]*", "card[0-9]*" };
   int fd = -1, i;
   const gchar *user_choice = g_getenv ("GST_MSDK_DRM_DEVICE");
+  gchar *ret_path = NULL;
 
   if (user_choice) {
     if (g_str_has_prefix (user_choice, "/dev/dri/"))
@@ -99,7 +100,12 @@ get_device_id (void)
       GST_ERROR ("The specified device isn't a valid drm device");
     }
 
-    return fd;
+    if (fd >= 0) {
+      ret_path = g_strdup (user_choice);
+      close (fd);
+    }
+
+    return ret_path;
   }
 
   client = g_udev_client_new (NULL);
@@ -131,6 +137,7 @@ get_device_id (void)
       if (fd < 0)
         continue;
       GST_DEBUG ("Opened the drm device node %s", devnode_path);
+      ret_path = g_strdup (devnode_path);
       break;
     }
 
@@ -141,42 +148,40 @@ get_device_id (void)
   }
 
 done:
+  if (fd >= 0)
+    close (fd);
+
   if (e)
     g_object_unref (e);
   if (client)
     g_object_unref (client);
 
-  return fd;
+  return ret_path;
 }
 
-
 static gboolean
 gst_msdk_context_use_vaapi (GstMsdkContext * context)
 {
-  gint fd;
+  char *path;
-  gint maj_ver, min_ver;
   VADisplay va_dpy = NULL;
-  VAStatus va_status;
+  GstVaDisplay *display_drm = NULL;
   mfxStatus status;
   GstMsdkContextPrivate *priv = context->priv;
 
-  fd = get_device_id ();
+  path = get_device_path ();
-  if (fd < 0) {
+  if (path == NULL) {
-    GST_WARNING ("Couldn't find a valid drm device node");
+    GST_ERROR ("Couldn't find a drm device node to open");
     return FALSE;
   }
 
-  va_dpy = vaGetDisplayDRM (fd);
+  display_drm = gst_va_display_drm_new_from_path (path);
-  if (!va_dpy) {
+  if (!display_drm) {
-    GST_ERROR ("Couldn't get a VA DRM display");
+    GST_ERROR ("Couldn't create a VA DRM display");
     goto failed;
   }
+  g_free (path);
 
-  va_status = vaInitialize (va_dpy, &maj_ver, &min_ver);
+  va_dpy = gst_va_display_get_va_dpy (display_drm);
-  if (va_status != VA_STATUS_SUCCESS) {
-    GST_ERROR ("Couldn't initialize VA DRM display");
-    goto failed;
-  }
 
   status = MFXVideoCORE_SetHandle (priv->session.session, MFX_HANDLE_VA_DISPLAY,
       (mfxHDL) va_dpy);
@@ -186,15 +191,14 @@ gst_msdk_context_use_vaapi (GstMsdkContext * context)
     goto failed;
   }
 
-  priv->fd = fd;
+  priv->display = display_drm;
-  priv->dpy = va_dpy;
 
   return TRUE;
 
 failed:
-  if (va_dpy)
+  if (display_drm)
-    vaTerminate (va_dpy);
+    gst_object_unref (display_drm);
-  close (fd);
+
   return FALSE;
 }
 #endif
@@ -217,8 +221,6 @@ gst_msdk_context_open (GstMsdkContext * context, gboolean hardware,
     goto failed;
 
 #ifndef _WIN32
-  priv->fd = -1;
-
   if (hardware) {
     if (!gst_msdk_context_use_vaapi (context))
       goto failed;
@@ -277,10 +279,8 @@ gst_msdk_context_finalize (GObject * obj)
   g_mutex_clear (&priv->mutex);
 
 #ifndef _WIN32
-  if (priv->dpy)
+  if (priv->display)
-    vaTerminate (priv->dpy);
+    gst_object_unref (priv->display);
-  if (priv->fd >= 0)
-    close (priv->fd);
 #endif
 
 done:
@@ -395,8 +395,7 @@ gst_msdk_context_new_with_parent (GstMsdkContext * parent)
   parent_priv->child_session_list =
       g_list_prepend (parent_priv->child_session_list, priv->session.session);
 #ifndef _WIN32
-  priv->dpy = parent_priv->dpy;
+  priv->display = parent_priv->display;
-  priv->fd = parent_priv->fd;
 #endif
   priv->parent_context = gst_object_ref (parent);
 
@@ -413,20 +412,20 @@ gpointer
 gst_msdk_context_get_handle (GstMsdkContext * context)
 {
 #ifndef _WIN32
-  return context->priv->dpy;
+  return gst_va_display_get_va_dpy (context->priv->display);
 #else
   return NULL;
 #endif
 }
 
-gint
+GstObject *
-gst_msdk_context_get_fd (GstMsdkContext * context)
+gst_msdk_context_get_display (GstMsdkContext * context)
 {
 #ifndef _WIN32
-  return context->priv->fd;
+  if (context->priv->display)
-#else
+    return gst_object_ref (GST_OBJECT_CAST (context->priv->display));
-  return -1;
 #endif
+  return NULL;
 }
 
 static gint

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

@@ -90,7 +90,7 @@ GstMsdkContext * gst_msdk_context_new_with_parent (GstMsdkContext * parent);
 mfxSession gst_msdk_context_get_session (GstMsdkContext * context);
 
 gpointer gst_msdk_context_get_handle (GstMsdkContext * context);
-gint gst_msdk_context_get_fd (GstMsdkContext * context);
+GstObject * gst_msdk_context_get_display (GstMsdkContext * context);
 
 /* GstMsdkContext contains mfxFrameAllocResponses,
  * if app calls MFXVideoCORE_SetFrameAllocator.