[gthumb] gstreamer: use gtksink if gtkglsink could not be created

[Paolo Bacchilega <paobac src gnome org>]

commit 871b5a144008cad17aebba3308291672e9114de5
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Fri May 21 09:15:05 2021 +0200

    gstreamer: use gtksink if gtkglsink could not be created

 extensions/gstreamer_tools/gth-media-viewer-page.c | 26 ++++++++++++++++------
 1 file changed, 19 insertions(+), 7 deletions(-)
---
diff --git a/extensions/gstreamer_tools/gth-media-viewer-page.c 
b/extensions/gstreamer_tools/gth-media-viewer-page.c
index 8e7ee0a0..5a2eda46 100644
--- a/extensions/gstreamer_tools/gth-media-viewer-page.c
+++ b/extensions/gstreamer_tools/gth-media-viewer-page.c
@@ -833,6 +833,7 @@ static void
 create_playbin (GthMediaViewerPage *self)
 {
        GstElement *scaletempo;
+       gboolean    sink_created;
        GstBus     *bus;
 
        if (self->priv->playbin != NULL)
@@ -844,18 +845,29 @@ create_playbin (GthMediaViewerPage *self)
        if (scaletempo != NULL)
                g_object_set (self->priv->playbin, "audio-filter", scaletempo, NULL);
 
+       sink_created = FALSE;
        if (g_settings_get_boolean (self->priv->settings, PREF_GSTREAMER_USE_HARDWARE_ACCEL)) {
-               GstElement *glsinkbin;
                GstElement *gtkglsink;
 
-               glsinkbin = gst_element_factory_make ("glsinkbin", "");
                gtkglsink = gst_element_factory_make ("gtkglsink", "sink");
-               g_object_set (glsinkbin, "sink", gtkglsink, NULL);
-               g_object_set (self->priv->playbin, "video-sink", glsinkbin, NULL);
-
-               g_object_get (gtkglsink, "widget", &self->priv->video_area, NULL);
+               if (gtkglsink != NULL) {
+                       GstElement *glsinkbin;
+
+                       glsinkbin = gst_element_factory_make ("glsinkbin", "");
+                       if (glsinkbin != NULL) {
+                               g_object_set (glsinkbin,
+                                             "enable-last-sample", TRUE,
+                                             "sink", gtkglsink,
+                                             NULL);
+                               g_object_set (self->priv->playbin, "video-sink", glsinkbin, NULL);
+                               g_object_get (gtkglsink, "widget", &self->priv->video_area, NULL);
+
+                               sink_created = TRUE;
+                       }
+               }
        }
-       else {
+
+       if (! sink_created) {
                GstElement *gtksink;
 
                gtksink = gst_element_factory_make ("gtksink", "sink");