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gtk: Marshall state changes in the main thread

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Gtk is not MT safe thus we need to make sure that everything is done
in the main thread when working with it.

https://bugzilla.gnome.org/show_bug.cgi?id=755251
This commit is contained in:
Thibault Saunier 2015-09-24 10:51:31 +02:00
parent afdea505a0
commit c3f7272929
1 changed files with 90 additions and 7 deletions
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97
ext/gtk/gstgtkbasesink.c
View file

@ -77,6 +77,54 @@ G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstGtkBaseSink, gst_gtk_base_sink,
GST_DEBUG_CATEGORY_INIT (gst_debug_gtk_base_sink,
"gtkbasesink", 0, "Gtk Video Sink base class"));
struct invoke_context
{
GThreadFunc func;
gpointer data;
GMutex lock;
GCond cond;
gboolean fired;
gpointer res;
};
static gboolean
_invoke_func (struct invoke_context *info)
{
g_mutex_lock (&info->lock);
info->res = info->func (info->data);
info->fired = TRUE;
g_cond_signal (&info->cond);
g_mutex_unlock (&info->lock);
return G_SOURCE_REMOVE;
}
static gpointer
_invoke_on_main (GThreadFunc func, gpointer data)
{
GMainContext *main_context = g_main_context_default ();
struct invoke_context info;
g_mutex_init (&info.lock);
g_cond_init (&info.cond);
info.fired = FALSE;
info.func = func;
info.data = data;
g_main_context_invoke (main_context, (GSourceFunc) _invoke_func, &info);
g_mutex_lock (&info.lock);
while (!info.fired)
g_cond_wait (&info.cond, &info.lock);
g_mutex_unlock (&info.lock);
g_mutex_clear (&info.lock);
g_cond_clear (&info.cond);
return info.res;
}
static void
gst_gtk_base_sink_class_init (GstGtkBaseSinkClass * klass)
{
@ -207,8 +255,21 @@ gst_gtk_base_sink_get_property (GObject * object, guint prop_id,
switch (prop_id) {
case PROP_WIDGET:
g_value_set_object (value, gst_gtk_base_sink_get_widget (gtk_sink));
{
GObject *widget = NULL;
GST_OBJECT_LOCK (gtk_sink);
if (gtk_sink->widget != NULL)
widget = G_OBJECT (gtk_sink->widget);
GST_OBJECT_UNLOCK (gtk_sink);
if (!widget)
widget = _invoke_on_main ((GThreadFunc) gst_gtk_base_sink_get_widget,
gtk_sink);
g_value_set_object (value, widget);
break;
}
case PROP_FORCE_ASPECT_RATIO:
g_value_set_boolean (value, gtk_sink->force_aspect_ratio);
break;
@ -273,7 +334,7 @@ gst_gtk_base_sink_navigation_interface_init (GstNavigationInterface * iface)
}
static gboolean
gst_gtk_base_sink_start (GstBaseSink * bsink)
gst_gtk_base_sink_start_on_main (GstBaseSink * bsink)
{
GstGtkBaseSink *gst_sink = GST_GTK_BASE_SINK (bsink);
GstGtkBaseSinkClass *klass = GST_GTK_BASE_SINK_GET_CLASS (bsink);
@ -303,7 +364,14 @@ gst_gtk_base_sink_start (GstBaseSink * bsink)
}
static gboolean
gst_gtk_base_sink_stop (GstBaseSink * bsink)
gst_gtk_base_sink_start (GstBaseSink * bsink)
{
return ! !_invoke_on_main ((GThreadFunc) gst_gtk_base_sink_start_on_main,
bsink);
}
static gboolean
gst_gtk_base_sink_stop_on_main (GstBaseSink * bsink)
{
GstGtkBaseSink *gst_sink = GST_GTK_BASE_SINK (bsink);
@ -317,11 +385,17 @@ gst_gtk_base_sink_stop (GstBaseSink * bsink)
}
static gboolean
_show_window_cb (GstGtkBaseSink * gtk_sink)
gst_gtk_base_sink_stop (GstBaseSink * bsink)
{
gtk_widget_show_all (gtk_sink->window);
return ! !_invoke_on_main ((GThreadFunc) gst_gtk_base_sink_stop_on_main,
bsink);
}
return FALSE;
static void
gst_gtk_widget_show_all_and_unref (GtkWidget * widget)
{
gtk_widget_show_all (widget);
g_object_unref (widget);
}
static GstStateChangeReturn
@ -340,11 +414,20 @@ gst_gtk_base_sink_change_state (GstElement * element, GstStateChange transition)
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
{
GtkWindow *window = NULL;
GST_OBJECT_LOCK (gtk_sink);
if (gtk_sink->window)
g_idle_add ((GSourceFunc) _show_window_cb, gtk_sink);
window = g_object_ref (gtk_sink->window);
GST_OBJECT_UNLOCK (gtk_sink);
if (window)
_invoke_on_main ((GThreadFunc) gst_gtk_widget_show_all_and_unref,
window);
break;
}
case GST_STATE_CHANGE_PAUSED_TO_READY:
GST_OBJECT_LOCK (gtk_sink);
if (gtk_sink->widget)