glvideomixer: fix vertex_buffer leak

We call the base class first as this will remove the pad from
the aggregator, thus stopping misc callbacks from being called,
one of which (process_textures) will recreate the vertex_buffer
if it is destroyed

https://bugzilla.gnome.org/show_bug.cgi?id=760873

diff --git a/ext/gl/gstglvideomixer.c b/ext/gl/gstglvideomixer.c
index 487bf2fe16dafdc3dd3acf4afcffd9f30f372731..78b5d06c51e7a05eea6e5596223dcebd85f74fad 100644 (file)
--- a/ext/gl/gstglvideomixer.c
+++ b/ext/gl/gstglvideomixer.c
@@ -841,14 +841,20 @@ static void
 gst_gl_video_mixer_release_pad (GstElement * element, GstPad * p)
 {
   GstGLVideoMixerPad *pad = GST_GL_VIDEO_MIXER_PAD (p);
+
+  /* we call the base class first as this will remove the pad from
+   * the aggregator, thus stopping misc callbacks from being called,
+   * one of which (process_textures) will recreate the vertex_buffer
+   * if it is destroyed */
+  GST_ELEMENT_CLASS (g_type_class_peek_parent (G_OBJECT_GET_CLASS (element)))
+      ->release_pad (element, p);
+
   if (pad->vertex_buffer) {
     GstGLBaseMixer *mix = GST_GL_BASE_MIXER (element);
     gst_gl_context_thread_add (mix->context, (GstGLContextThreadFunc)
         _del_buffer, &pad->vertex_buffer);
     pad->vertex_buffer = 0;
   }
-  GST_ELEMENT_CLASS (g_type_class_peek_parent (G_OBJECT_GET_CLASS (element)))
-      ->release_pad (element, p);
 }
 
 static void