LinGui: fix crash when necessary gstreamer plugin is not installed

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@3166 b64f7644-9d1e-0410-96f1-a4d463321fa5

2 files changed, 37 insertions, 12 deletions

diff --git a/gtk/src/ghb.ui b/gtk/src/ghb.ui
index 3ace356ca..3d7d9a53b 100644
--- a/gtk/src/ghb.ui
+++ b/gtk/src/ghb.ui
@@ -6068,7 +6068,7 @@ The classic deinterlace filter is applied to all frames. Frames that are not int
                   </packing>
                 </child>
                 <child>
-                  <object class="GtkHBox" id="hbox70">
+                  <object class="GtkHBox" id="live_preview_box">
                     <property name="visible">True</property>
                     <property name="spacing">5</property>
                     <child>
@@ -6152,7 +6152,7 @@ The classic deinterlace filter is applied to all frames. Frames that are not int
                     <property name="visible">True</property>
                     <property name="spacing">10</property>
                     <child>
-                      <object class="GtkHBox" id="hbox60">
+                      <object class="GtkHBox" id="live_preview_duration_box">
                         <property name="visible">True</property>
                         <property name="spacing">2</property>
                         <child>
diff --git a/gtk/src/preview.c b/gtk/src/preview.c
index 07ae765df..2171f8ac8 100644
--- a/gtk/src/preview.c
+++ b/gtk/src/preview.c
@@ -62,6 +62,7 @@ struct preview_s
 	gint encode_frame;
 	gint live_id;
 	gchar *current;
+	gint live_enabled;
 };
 
 #if defined(_ENABLE_GST)
@@ -82,6 +83,9 @@ ghb_screen_par(signal_user_data_t *ud, gint *par_n, gint *par_d)
 	GObjectClass *klass;
 	GParamSpec *pspec;
 
+	if (!ud->preview->live_enabled)
+		goto fail;
+
 	g_value_init(&disp_par, GST_TYPE_FRACTION);
 	gst_value_set_fraction(&disp_par, 1, 1);
 	g_object_get(ud->preview->play, "video-sink", &xover, NULL);
@@ -169,7 +173,7 @@ ghb_preview_init(signal_user_data_t *ud)
 	//xover = gst_element_factory_make("xvimagesink", "xover");
 	//xover = gst_element_factory_make("ximagesink", "xover");
 	xover = gst_element_factory_make("gconfvideosink", "xover");
-	if (xover == NULL)
+	if (ud->preview->play == NULL || xover == NULL)
 	{
 		GtkWidget *widget = GHB_WIDGET(ud->builder, "live_preview_box");
 		gtk_widget_hide (widget);
@@ -177,16 +181,19 @@ ghb_preview_init(signal_user_data_t *ud)
 		gtk_widget_hide (widget);
 		return;
 	}
+	else
+	{
 
-	g_object_set(G_OBJECT(ud->preview->play), "video-sink", xover, NULL);
-	g_object_set(ud->preview->play, "subtitle-font-desc", 
-				"sans bold 20", NULL);
-	//g_object_set(G_OBJECT(xover), "force-aspect-ratio", TRUE, NULL);
+		g_object_set(G_OBJECT(ud->preview->play), "video-sink", xover, NULL);
+		g_object_set(ud->preview->play, "subtitle-font-desc", 
+					"sans bold 20", NULL);
 
-	bus = gst_pipeline_get_bus(GST_PIPELINE(ud->preview->play));
-	gst_bus_add_watch(bus, live_preview_cb, ud);
-	gst_bus_set_sync_handler(bus, create_window, ud->preview);
-	gst_object_unref(bus);
+		bus = gst_pipeline_get_bus(GST_PIPELINE(ud->preview->play));
+		gst_bus_add_watch(bus, live_preview_cb, ud);
+		gst_bus_set_sync_handler(bus, create_window, ud->preview);
+		gst_object_unref(bus);
+		ud->preview->live_enabled = 1;
+	}
 #else
 	widget = GHB_WIDGET(ud->builder, "live_preview_box");
 	gtk_widget_hide (widget);
@@ -445,6 +452,9 @@ live_preview_start(signal_user_data_t *ud)
 	GtkImage *img;
 	gchar *uri;
 
+	if (!ud->preview->live_enabled)
+		return;
+
 	img = GTK_IMAGE(GHB_WIDGET(ud->builder, "live_preview_play_image"));
 	if (!ud->preview->encoded[ud->preview->frame])
 	{
@@ -468,6 +478,9 @@ live_preview_pause(signal_user_data_t *ud)
 {
 	GtkImage *img;
 
+	if (!ud->preview->live_enabled)
+		return;
+
 	img = GTK_IMAGE(GHB_WIDGET(ud->builder, "live_preview_play_image"));
 	gtk_image_set_from_stock(img, "gtk-media-play", GTK_ICON_SIZE_BUTTON);
 	gst_element_set_state(ud->preview->play, GST_STATE_PAUSED);
@@ -481,6 +494,9 @@ live_preview_stop(signal_user_data_t *ud)
 	GtkImage *img;
 	GtkRange *progress;
 
+	if (!ud->preview->live_enabled)
+		return;
+
 	img = GTK_IMAGE(GHB_WIDGET(ud->builder, "live_preview_play_image"));
 	gtk_image_set_from_stock(img, "gtk-media-play", GTK_ICON_SIZE_BUTTON);
 #if defined(_ENABLE_GST)
@@ -605,6 +621,9 @@ ghb_live_preview_progress(signal_user_data_t *ud)
 	GstFormat fmt = GST_FORMAT_TIME;
 	gint64 len = -1, pos = -1;
 
+	if (!ud->preview->live_enabled)
+		return;
+
 	if (ud->preview->state != PREVIEW_STATE_LIVE || ud->preview->seek_lock)
 		return;
 
@@ -654,6 +673,9 @@ live_preview_seek_cb(GtkWidget *widget, signal_user_data_t *ud)
 	gdouble dval;
 	gint64 pos;
 
+	if (!ud->preview->live_enabled)
+		return;
+
 	if (ud->preview->progress_lock)
 		return;
 
@@ -757,6 +779,9 @@ delayed_expose_cb(signal_user_data_t *ud)
 	GstElement *vsink;
 	GstXOverlay *xover;
 
+	if (!ud->preview->live_enabled)
+		return FALSE;
+
 	g_object_get(ud->preview->play, "video-sink", &vsink, NULL);
 	if (vsink == NULL)
 		return FALSE;
@@ -780,7 +805,7 @@ preview_expose_cb(
 	signal_user_data_t *ud)
 {
 #if defined(_ENABLE_GST)
-	if (ud->preview->state == PREVIEW_STATE_LIVE)
+	if (ud->preview->live_enabled && ud->preview->state == PREVIEW_STATE_LIVE)
 	{
 		if (GST_STATE(ud->preview->play) >= GST_STATE_PAUSED)
 		{