[PATCH spice-gtk 2/2] Let user rank gstreamer element

[Snir Sheriber <ssheribe@xxxxxxxxxx>]

User can now rank a gstreamer element with high rank
by setting SPICE_GST_RANK_HIGH to the element's name.
This can be used to prioritize specific decoder to
be chosen by playbin.
---
 src/channel-display-gst.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/channel-display-gst.c b/src/channel-display-gst.c
index af87fb5..fe3918d 100644
--- a/src/channel-display-gst.c
+++ b/src/channel-display-gst.c
@@ -340,6 +340,27 @@ static void app_source_setup(GstElement *pipeline G_GNUC_UNUSED,
     gst_caps_unref(caps);
     decoder->appsrc = GST_APP_SRC(gst_object_ref(source));
 }
+
+static void gst_factory_rank_high(void) {
+    GstRegistry *registry = NULL;
+    GstElementFactory *factory = NULL;
+    const gchar *name = NULL;
+
+
+    registry = gst_registry_get ();
+    if (!registry) return;
+
+    name = g_getenv("SPICE_GST_RANK_HIGH");
+    if (!name) return;
+
+    factory = gst_element_factory_find (name);
+    if (!factory) return;
+
+    gst_plugin_feature_set_rank (GST_PLUGIN_FEATURE (factory), GST_RANK_PRIMARY + 1);
+
+    gst_registry_add_feature (registry, GST_PLUGIN_FEATURE (factory));
+    return;
+}
 #endif
 
 static gboolean create_pipeline(SpiceGstDecoder *decoder)
@@ -358,6 +379,8 @@ static gboolean create_pipeline(SpiceGstDecoder *decoder)
         return FALSE;
     }
 
+    gst_factory_rank_high();
+
     convert = gst_element_factory_make("autovideoconvert", "autovideoconvert");
     download = gst_element_factory_make("gldownload", "gldownload");
     appsink = gst_element_factory_make("appsink", "appsink");
-- 
2.9.5

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