From 5c4292b019a298d58cc81220def422cd18be161d Mon Sep 17 00:00:00 2001
From: Guillaume Desmottes <guillaume.desmottes@collabora.com>
Date: Thu, 25 Jul 2019 21:21:26 +0530
Subject: [PATCH] gtkglsink: fix crash when widget is resized after element
 destruction

Prevent _size_changed_cb() to be called after gtkglsink has been finalized.

Fix #632
---
 ext/gtk/gstgtkglsink.c | 49 +++++++++++++++++++++++++++++++++++++++++-
 ext/gtk/gstgtkglsink.h |  3 +++
 2 files changed, 51 insertions(+), 1 deletion(-)

diff --git a/ext/gtk/gstgtkglsink.c b/ext/gtk/gstgtkglsink.c
index 22410f72ab..1102d47c9d 100644
--- a/ext/gtk/gstgtkglsink.c
+++ b/ext/gtk/gstgtkglsink.c
@@ -43,6 +43,8 @@ static gboolean gst_gtk_gl_sink_propose_allocation (GstBaseSink * bsink,
 static GstCaps *gst_gtk_gl_sink_get_caps (GstBaseSink * bsink,
     GstCaps * filter);
 
+static void gst_gtk_gl_sink_finalize (GObject * object);
+
 static GstStaticPadTemplate gst_gtk_gl_sink_template =
     GST_STATIC_PAD_TEMPLATE ("sink",
     GST_PAD_SINK,
@@ -61,14 +63,18 @@ G_DEFINE_TYPE_WITH_CODE (GstGtkGLSink, gst_gtk_gl_sink,
 static void
 gst_gtk_gl_sink_class_init (GstGtkGLSinkClass * klass)
 {
+  GObjectClass *gobject_class;
   GstElementClass *gstelement_class;
   GstBaseSinkClass *gstbasesink_class;
   GstGtkBaseSinkClass *gstgtkbasesink_class;
 
+  gobject_class = (GObjectClass *) klass;
   gstelement_class = (GstElementClass *) klass;
   gstbasesink_class = (GstBaseSinkClass *) klass;
   gstgtkbasesink_class = (GstGtkBaseSinkClass *) klass;
 
+  gobject_class->finalize = gst_gtk_gl_sink_finalize;
+
   gstbasesink_class->query = gst_gtk_gl_sink_query;
   gstbasesink_class->propose_allocation = gst_gtk_gl_sink_propose_allocation;
   gstbasesink_class->start = gst_gtk_gl_sink_start;
@@ -138,6 +144,20 @@ _size_changed_cb (GtkWidget * widget, GdkRectangle * rectangle,
   }
 }
 
+static void
+destroy_cb (GtkWidget * widget, GstGtkGLSink * gtk_sink)
+{
+  if (gtk_sink->size_allocate_sig_handler) {
+    g_signal_handler_disconnect (widget, gtk_sink->size_allocate_sig_handler);
+    gtk_sink->size_allocate_sig_handler = 0;
+  }
+
+  if (gtk_sink->widget_destroy_sig_handler) {
+    g_signal_handler_disconnect (widget, gtk_sink->widget_destroy_sig_handler);
+    gtk_sink->widget_destroy_sig_handler = 0;
+  }
+}
+
 static gboolean
 gst_gtk_gl_sink_start (GstBaseSink * bsink)
 {
@@ -152,8 +172,14 @@ gst_gtk_gl_sink_start (GstBaseSink * bsink)
   gst_widget = GTK_GST_GL_WIDGET (base_sink->widget);
 
   /* Track the allocation size */
-  g_signal_connect (gst_widget, "size-allocate", G_CALLBACK (_size_changed_cb),
+  gtk_sink->size_allocate_sig_handler =
+      g_signal_connect (gst_widget, "size-allocate",
+      G_CALLBACK (_size_changed_cb), gtk_sink);
+
+  gtk_sink->widget_destroy_sig_handler =
+      g_signal_connect (gst_widget, "destroy", G_CALLBACK (destroy_cb),
       gtk_sink);
+
   _size_changed_cb (GTK_WIDGET (gst_widget), NULL, gtk_sink);
 
   if (!gtk_gst_gl_widget_init_winsys (gst_widget)) {
@@ -315,3 +341,24 @@ gst_gtk_gl_sink_get_caps (GstBaseSink * bsink, GstCaps * filter)
 
   return result;
 }
+
+static void
+gst_gtk_gl_sink_finalize (GObject * object)
+{
+  GstGtkGLSink *gtk_sink = GST_GTK_GL_SINK (object);
+  GstGtkBaseSink *base_sink = GST_GTK_BASE_SINK (object);
+
+  if (gtk_sink->size_allocate_sig_handler) {
+    g_signal_handler_disconnect (base_sink->widget,
+        gtk_sink->size_allocate_sig_handler);
+    gtk_sink->size_allocate_sig_handler = 0;
+  }
+
+  if (gtk_sink->widget_destroy_sig_handler) {
+    g_signal_handler_disconnect (base_sink->widget,
+        gtk_sink->widget_destroy_sig_handler);
+    gtk_sink->widget_destroy_sig_handler = 0;
+  }
+
+  G_OBJECT_CLASS (parent_class)->finalize (object);
+}
diff --git a/ext/gtk/gstgtkglsink.h b/ext/gtk/gstgtkglsink.h
index 789cf33f66..fbe392a877 100644
--- a/ext/gtk/gstgtkglsink.h
+++ b/ext/gtk/gstgtkglsink.h
@@ -64,6 +64,9 @@ struct _GstGtkGLSink
   /* read/write with object lock */
   gint                  display_width;
   gint                  display_height;
+
+  gulong                size_allocate_sig_handler;
+  gulong                widget_destroy_sig_handler;
 };
 
 /**