plugins: add gst_vaapi_driver_is_whitelisted()

Move some of the logic in gst_vaapi_plugin_base_driver_is_whitelisted() to a
new function gst_vaapi_driver_is_whitelisted(), in this way, it can be used
when registering the plugin's feature set with the test VA display.

https://bugzilla.gnome.org/show_bug.cgi?id=724352

gst/vaapi/gstvaapipluginbase.c

@@ -34,9 +34,6 @@
 /* Default debug category is from the subclass */
 #define GST_CAT_DEFAULT (plugin->debug_category)
 
-/* Environment variable for disable driver white-list */
-#define GST_VAAPI_ALL_DRIVERS_ENV "GST_VAAPI_ALL_DRIVERS"
-
 /* GstVideoContext interface */
 static void
 plugin_set_display (GstVaapiPluginBase * plugin, GstVaapiDisplay * display)
@@ -89,32 +86,12 @@ gst_vaapi_plugin_base_set_context (GstVaapiPluginBase * plugin,
 gboolean
 gst_vaapi_plugin_base_driver_is_whitelisted (GstVaapiPluginBase * plugin)
 {
-  const gchar *vendor;
-  guint i;
   GstVaapiDisplay *display;
-  static const gchar *whitelist[] = {
-    "Intel i965 driver",
-    "mesa gallium vaapi",
-    NULL
-  };
-
-  if (g_getenv (GST_VAAPI_ALL_DRIVERS_ENV))
-    return TRUE;
 
   display = GST_VAAPI_PLUGIN_BASE_DISPLAY (plugin);
   if (!display)
     goto no_display;
-  vendor = gst_vaapi_display_get_vendor_string (display);
-  if (!vendor)
-    goto no_vendor;
-  for (i = 0; whitelist[i]; i++) {
-    if (g_ascii_strncasecmp (vendor, whitelist[i], strlen (whitelist[i])) == 0)
-      return TRUE;
-  }
-
-  GST_ERROR ("Unsupported VA driver: %s. Export environment variable "
-      GST_VAAPI_ALL_DRIVERS_ENV " to bypass", vendor);
-  return FALSE;
+  return gst_vaapi_driver_is_whitelisted (display);
 
   /* ERRORS */
 no_display:
@@ -122,11 +99,6 @@ no_display:
     GST_WARNING_OBJECT (plugin, "no VA-API display available");
     return FALSE;
   }
-no_vendor:
-  {
-    GST_WARNING_OBJECT (plugin, "no VA-API driver vendor description");
-    return FALSE;
-  }
 }
 
 void

gst/vaapi/gstvaapipluginutil.c

@@ -42,6 +42,9 @@
 #include "gstvaapipluginutil.h"
 #include "gstvaapipluginbase.h"
 
+/* Environment variable for disable driver white-list */
+#define GST_VAAPI_ALL_DRIVERS_ENV "GST_VAAPI_ALL_DRIVERS"
+
 typedef GstVaapiDisplay *(*GstVaapiDisplayCreateFunc) (const gchar *);
 typedef GstVaapiDisplay *(*GstVaapiDisplayCreateFromHandleFunc) (gpointer);
 
@@ -722,3 +725,48 @@ gst_vaapi_create_test_display (void)
 {
   return gst_vaapi_create_display (GST_VAAPI_DISPLAY_TYPE_ANY, NULL);
 }
+
+/**
+ * gst_vaapi_driver_is_whitelisted:
+ * @display: a #GstVaapiDisplay
+ *
+ * Looks the VA-API driver vendors in an internal white-list.
+ *
+ * Returns: %TRUE if driver is in the white-list, otherwise %FALSE
+ **/
+gboolean
+gst_vaapi_driver_is_whitelisted (GstVaapiDisplay * display)
+{
+  const gchar *vendor;
+  guint i;
+  static const gchar *whitelist[] = {
+    "Intel i965 driver",
+    "mesa gallium vaapi",
+    NULL
+  };
+
+  g_return_val_if_fail (display, FALSE);
+
+  if (g_getenv (GST_VAAPI_ALL_DRIVERS_ENV))
+    return TRUE;
+
+  vendor = gst_vaapi_display_get_vendor_string (display);
+  if (!vendor)
+    goto no_vendor;
+
+  for (i = 0; whitelist[i]; i++) {
+    if (g_ascii_strncasecmp (vendor, whitelist[i], strlen (whitelist[i])) == 0)
+      return TRUE;
+  }
+
+  GST_ERROR ("Unsupported VA driver: %s. Export environment variable "
+      GST_VAAPI_ALL_DRIVERS_ENV " to bypass", vendor);
+  return FALSE;
+
+  /* ERRORS */
+no_vendor:
+  {
+    GST_WARNING ("no VA-API driver vendor description");
+    return FALSE;
+  }
+}

gst/vaapi/gstvaapipluginutil.h

@@ -135,4 +135,8 @@ G_GNUC_INTERNAL
 GstVaapiDisplay *
 gst_vaapi_create_test_display (void);
 
+G_GNUC_INTERNAL
+gboolean
+gst_vaapi_driver_is_whitelisted (GstVaapiDisplay * display);
+
 #endif /* GST_VAAPI_PLUGIN_UTIL_H */