From b8063133961334e3c9b8b89caaaa3789723ab7a7 Mon Sep 17 00:00:00 2001
From: George Kiagiadakis <george.kiagiadakis@collabora.com>
Date: Fri, 23 May 2014 13:09:27 +0300
Subject: [PATCH] wayland: add public API for creating & using the display
 handle GstContext

---
 ext/wayland/gstwaylandsink.c   | 10 ++++------
 gst-libs/gst/wayland/wayland.c | 39 +++++++++++++++++++++++++++++++++++++++
 gst-libs/gst/wayland/wayland.h |  7 +++++++
 3 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/ext/wayland/gstwaylandsink.c b/ext/wayland/gstwaylandsink.c
index 63f348d..1a37d6d 100644
--- a/ext/wayland/gstwaylandsink.c
+++ b/ext/wayland/gstwaylandsink.c
@@ -265,9 +265,7 @@ gst_wayland_sink_find_display (GstWaylandSink * sink)
         } else {
           /* inform the world about the new display */
           context =
-              gst_context_new (GST_WAYLAND_DISPLAY_HANDLE_CONTEXT_TYPE, FALSE);
-          gst_structure_set (gst_context_writable_structure (context),
-              "handle", G_TYPE_POINTER, sink->display->display, NULL);
+              gst_wayland_display_handle_context_new (sink->display->display);
           msg = gst_message_new_have_context (GST_OBJECT_CAST (sink), context);
           gst_element_post_message (GST_ELEMENT_CAST (sink), msg);
         }
@@ -345,13 +343,13 @@ gst_wayland_sink_set_context (GstElement * element, GstContext * context)
 
   if (gst_context_has_context_type (context,
           GST_WAYLAND_DISPLAY_HANDLE_CONTEXT_TYPE)) {
-    const GstStructure *s;
     struct wl_display *display;
     GError *error = NULL;
 
-    s = gst_context_get_structure (context);
-    gst_structure_get (s, "handle", G_TYPE_POINTER, &display, NULL);
+    g_clear_object (&sink->display);
+    display = gst_wayland_display_handle_context_get_handle (context);
     sink->display = gst_wl_display_new_existing (display, FALSE, &error);
+
     if (error) {
       GST_ELEMENT_WARNING (sink, RESOURCE, OPEN_READ_WRITE,
           ("Could not set display handle"),
diff --git a/gst-libs/gst/wayland/wayland.c b/gst-libs/gst/wayland/wayland.c
index 9ede5b8..81c673f 100644
--- a/gst-libs/gst/wayland/wayland.c
+++ b/gst-libs/gst/wayland/wayland.c
@@ -25,6 +25,45 @@
 #include <gst/wayland/wayland.h>
 #include <gst/video/videooverlay.h>
 
+gboolean
+gst_is_wayland_display_handle_need_context_message (GstMessage * msg)
+{
+  const gchar *type = NULL;
+
+  g_return_val_if_fail (GST_IS_MESSAGE (msg), FALSE);
+
+  if (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_NEED_CONTEXT &&
+      gst_message_parse_context_type (msg, &type)) {
+    return !g_strcmp0 (type, GST_WAYLAND_DISPLAY_HANDLE_CONTEXT_TYPE);
+  }
+
+  return FALSE;
+}
+
+GstContext *
+gst_wayland_display_handle_context_new (struct wl_display * display)
+{
+  GstContext *context =
+      gst_context_new (GST_WAYLAND_DISPLAY_HANDLE_CONTEXT_TYPE, TRUE);
+  gst_structure_set (gst_context_writable_structure (context),
+      "handle", G_TYPE_POINTER, display, NULL);
+  return context;
+}
+
+struct wl_display *
+gst_wayland_display_handle_context_get_handle (GstContext * context)
+{
+  const GstStructure *s;
+  struct wl_display *display;
+
+  g_return_val_if_fail (GST_IS_CONTEXT (context), NULL);
+
+  s = gst_context_get_structure (context);
+  gst_structure_get (s, "handle", G_TYPE_POINTER, &display, NULL);
+  return display;
+}
+
+
 G_DEFINE_INTERFACE (GstWaylandVideo, gst_wayland_video, GST_TYPE_VIDEO_OVERLAY);
 
 static void
diff --git a/gst-libs/gst/wayland/wayland.h b/gst-libs/gst/wayland/wayland.h
index 81611cc..49e57a7 100644
--- a/gst-libs/gst/wayland/wayland.h
+++ b/gst-libs/gst/wayland/wayland.h
@@ -30,6 +30,13 @@ G_BEGIN_DECLS
  * from the application to the sink */
 #define GST_WAYLAND_DISPLAY_HANDLE_CONTEXT_TYPE "GstWaylandDisplayHandleContextType"
 
+gboolean gst_is_wayland_display_handle_need_context_message (GstMessage * msg);
+GstContext *
+gst_wayland_display_handle_context_new (struct wl_display * display);
+struct wl_display *
+gst_wayland_display_handle_context_get_handle (GstContext * context);
+
+
 #define GST_TYPE_WAYLAND_VIDEO \
     (gst_wayland_video_get_type ())
 #define GST_WAYLAND_VIDEO(obj) \
-- 
2.7.4