libs: display: redirect logging at initialize

Redirect libva's logs to GStreamer logging mechanism. This is
particularly useful when VA is initialized, because it always logs
out the drivers details.

In order to achieve this a new helper function was added as a wrapper
for the vaInitialize() function.

https://bugzilla.gnome.org/show_bug.cgi?id=777115

gst-libs/gst/vaapi/gstvaapidisplay.c

@@ -900,8 +900,6 @@ gst_vaapi_display_create_unlocked (GstVaapiDisplay * display,
   GstVaapiDisplayPrivate *const priv = GST_VAAPI_DISPLAY_GET_PRIVATE (display);
   const GstVaapiDisplayClass *const klass =
       GST_VAAPI_DISPLAY_GET_CLASS (display);
-  gint major_version, minor_version;
-  VAStatus status;
   GstVaapiDisplayInfo info;
   const GstVaapiDisplayInfo *cached_info = NULL;
 
@@ -947,10 +945,8 @@ gst_vaapi_display_create_unlocked (GstVaapiDisplay * display,
   }
 
   if (!priv->parent) {
-    status = vaInitialize (priv->display, &major_version, &minor_version);
+    if (!vaapi_initialize (priv->display))
-    if (!vaapi_check_status (status, "vaInitialize()"))
       return FALSE;
-    GST_DEBUG ("VA-API version %d.%d", major_version, minor_version);
   }
 
   if (!cached_info) {

gst-libs/gst/vaapi/gstvaapidisplay_drm.c

@@ -63,13 +63,12 @@ supports_vaapi (int fd)
 {
   gboolean ret;
   VADisplay va_dpy;
-  int major, minor;
 
   va_dpy = vaGetDisplayDRM (fd);
   if (!va_dpy)
     return FALSE;
 
-  ret = (vaInitialize (va_dpy, &major, &minor) == VA_STATUS_SUCCESS);
+  ret = vaapi_initialize (va_dpy);
   vaTerminate (va_dpy);
   return ret;
 }

gst-libs/gst/vaapi/gstvaapiutils.c

@@ -45,6 +45,39 @@
 #define STRCASEP(p, x)  STRCASE(CONCAT(p, x))
 #define STRCASE(x)      case x: return STRINGIFY(x)
 
+#if VA_CHECK_VERSION (0,39,4)
+static void
+gst_vaapi_log (const char *message)
+{
+  gchar *msg;
+
+  msg = g_strdup (message);
+  if (!msg)
+    return;
+  g_strchomp (msg);
+  GST_INFO ("%s", msg);
+  g_free (msg);
+}
+#endif
+
+gboolean
+vaapi_initialize (VADisplay dpy)
+{
+  gint major_version, minor_version;
+  VAStatus status;
+
+#if VA_CHECK_VERSION (0,39,4)
+  vaSetInfoCallback (gst_vaapi_log);
+#endif
+
+  status = vaInitialize (dpy, &major_version, &minor_version);
+  if (!vaapi_check_status (status, "vaInitialize()"))
+    return FALSE;
+
+  GST_INFO ("VA-API version %d.%d", major_version, minor_version);
+  return TRUE;
+}
+
 /* Check VA status for success or print out an error */
 gboolean
 vaapi_check_status (VAStatus status, const gchar * msg)

gst-libs/gst/vaapi/gstvaapiutils.h

@@ -30,6 +30,11 @@
 #include <glib.h>
 #include <va/va.h>
 
+/** calls vaInitialize() redirecting the logging mechanism */
+G_GNUC_INTERNAL
+gboolean
+vaapi_initialize (VADisplay dpy);
+
 /** Check VA status for success or print out an error */
 G_GNUC_INTERNAL
 gboolean