examples/wayland: Add wayland multi-thread client example

This is for testing race condition with multi-thread wayland client
environment. The race condition will be resolved with wayland proxy
wrapper API when handling event queue.

tests/examples/waylandsink/Makefile.am

@@ -1,5 +1,7 @@
-noinst_PROGRAMS = gtkwaylandsink
+GST_WAYLANDSINK_UI_FILES = window.ui
+if HAVE_GTK3_WAYLAND
 
+GST_WAYLANDSINK_GTK_EXAMPLE = gtkwaylandsink
 gtkwaylandsink_SOURCES = main.c
 
 gtkwaylandsink_CFLAGS=-I$(top_srcdir)/gst-libs -I$(top_builddir)/gst-libs \
@@ -7,5 +9,17 @@ gtkwaylandsink_CFLAGS=-I$(top_srcdir)/gst-libs -I$(top_builddir)/gst-libs \
 gtkwaylandsink_LDADD=$(GTK3_LIBS) $(GST_PLUGINS_BASE_LIBS) $(GST_LIBS) \
 	-lgstvideo-$(GST_API_VERSION) \
 	$(top_builddir)/gst-libs/gst/wayland/libgstwayland-$(GST_API_VERSION).la
+else
+GST_WAYLANDSINK_GTK_EXAMPLE =
+endif
 
-EXTRA_DIST = window.ui
+wayland_threads_SOURCES = wayland-threads.c
+wayland_threads_CFLAGS=-I$(top_srcdir)/gst-libs -I$(top_builddir)/gst-libs \
+	$(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS) $(WAYLAND_CFLAGS)
+wayland_threads_LDADD=$(GST_PLUGINS_BASE_LIBS) $(GST_LIBS) $(WAYLAND_LIBS)\
+	-lgstvideo-$(GST_API_VERSION) \
+	$(top_builddir)/gst-libs/gst/wayland/libgstwayland-$(GST_API_VERSION).la
+
+noinst_PROGRAMS = $(GST_WAYLANDSINK_GTK_EXAMPLE) wayland_threads
+
+EXTRA_DIST = $(GST_WAYLANDSINK_UI_FILES)

tests/examples/waylandsink/meson.build

@@ -1,7 +1,8 @@
 gtk_dep = dependency('gtk+-3.0', required : get_option('examples'))
 gtk_wayland_dep = dependency('gtk+-wayland-3.0', required : get_option('examples'))
 
-if use_wayland and gtk_dep.found() and gtk_wayland_dep.found()
+if use_wayland
+  if gtk_dep.found() and gtk_wayland_dep.found()
     executable('waylandsink',
       'main.c',
       extra_files: ['window.ui'],
@@ -11,3 +12,11 @@ if use_wayland and gtk_dep.found() and gtk_wayland_dep.found()
       c_args : ['-DHAVE_CONFIG_H=1', '-DGST_USE_UNSTABLE_API=1'],
     )
   endif
+  executable('wayland_threads',
+    'wayland-threads.c',
+    install: false,
+    include_directories : [configinc],
+    dependencies : [gst_dep, gstwayland_dep, wl_client_dep],
+    c_args : ['-DHAVE_CONFIG_H=1', '-DGST_USE_UNSTABLE_API=1'],
+  )
+endif

tests/examples/waylandsink/wayland-threads.c

@@ -0,0 +1,212 @@
+/*
+ * Copyright (C) 2018 LG Electronics
+ *   @author Wonchul Lee <w.lee@lge.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include <gst/gst.h>
+
+#include <gst/video/videooverlay.h>
+#include <gst/wayland/wayland.h>
+
+static gint retry = 100;
+
+typedef struct
+{
+  struct wl_display *display;
+  struct wl_display *display_wrapper;
+  struct wl_registry *registry;
+  struct wl_compositor *compositor;
+  struct wl_event_queue *queue;
+
+  GThread *thread;
+
+  GstElement *pipeline1;
+  GstElement *pipeline2;
+  GstVideoOverlay *overlay;
+  GMainLoop *loop;
+} App;
+
+static gboolean
+message_cb (GstBus * bus, GstMessage * message, gpointer user_data)
+{
+  App *app = user_data;
+  switch (GST_MESSAGE_TYPE (message)) {
+    case GST_MESSAGE_ERROR:{
+      GError *err = NULL;
+      gchar *debug = NULL;
+
+      gst_message_parse_error (message, &err, &debug);
+      gst_printerrln ("Error message received: %s", err->message);
+      gst_printerrln ("Debug info: %s", debug);
+      g_error_free (err);
+      g_free (debug);
+    }
+    case GST_MESSAGE_EOS:
+      if (retry <= 0)
+        g_main_loop_quit (app->loop);
+      gst_element_set_state (GST_ELEMENT (GST_MESSAGE_SRC (message)),
+          GST_STATE_NULL);
+      gst_element_set_state (GST_ELEMENT (GST_MESSAGE_SRC (message)),
+          GST_STATE_PLAYING);
+      retry--;
+      break;
+    default:
+      break;
+  }
+  return TRUE;
+}
+
+static GstBusSyncReply
+bus_sync_handler (GstBus * bus, GstMessage * message, gpointer user_data)
+{
+  App *app = user_data;
+
+  if (gst_is_wayland_display_handle_need_context_message (message)) {
+    GstContext *context;
+    context = gst_wayland_display_handle_context_new (app->display);
+    gst_element_set_context (GST_ELEMENT (GST_MESSAGE_SRC (message)), context);
+
+    goto drop;
+  }
+  return GST_BUS_PASS;
+
+drop:
+  gst_message_unref (message);
+  return GST_BUS_DROP;
+}
+
+static void
+registry_handle (void *data, struct wl_registry *registry,
+    uint32_t id, const char *interface, uint32_t version)
+{
+  App *app = data;
+
+  if (g_strcmp0 (interface, "wl_compositor") == 0) {
+    app->compositor =
+        wl_registry_bind (app->registry, id, &wl_compositor_interface,
+        MIN (version, 3));
+  }
+}
+
+static const struct wl_registry_listener registry_listener = {
+  registry_handle
+};
+
+static gpointer
+wl_main_thread_run (gpointer data)
+{
+  App *app = data;
+  while (wl_display_dispatch_queue (app->display, app->queue) != -1)
+    return NULL;
+
+  return NULL;
+}
+
+static GstElement *
+build_pipeline (App * app, gint num_buffers)
+{
+  GstElement *pipeline;
+  GstBus *bus;
+  gchar *str;
+
+  str =
+      g_strdup_printf ("videotestsrc num-buffers=%d ! waylandsink",
+      num_buffers);
+
+  pipeline = gst_parse_launch (str, NULL);
+  g_free (str);
+  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
+  gst_bus_add_signal_watch (bus);
+  g_signal_connect (bus, "message", G_CALLBACK (message_cb), app);
+  gst_bus_set_sync_handler (bus, bus_sync_handler, app, NULL);
+  gst_object_unref (bus);
+
+  return pipeline;
+}
+
+int
+main (int argc, char **argv)
+{
+  App *app;
+  GError *error = NULL;
+
+  gst_init (&argc, &argv);
+
+  app = g_slice_new0 (App);
+
+  app->loop = g_main_loop_new (NULL, FALSE);
+
+  app->display = wl_display_connect (NULL);
+  if (!app->display)
+    goto done;
+  app->display_wrapper = wl_proxy_create_wrapper (app->display);
+  app->queue = wl_display_create_queue (app->display);
+  wl_proxy_set_queue ((struct wl_proxy *) app->display_wrapper, app->queue);
+  app->registry = wl_display_get_registry (app->display_wrapper);
+  wl_registry_add_listener (app->registry, &registry_listener, app);
+
+  wl_display_roundtrip_queue (app->display, app->queue);
+  wl_display_roundtrip_queue (app->display, app->queue);
+
+  if (!app->compositor) {
+    g_set_error (&error, g_quark_from_static_string ("waylandMultiThreads"), 0,
+        "Could not bind to wl_compositor interface");
+    goto done;
+  }
+
+  app->thread =
+      g_thread_try_new ("WlMainThread", wl_main_thread_run, app, &error);
+  if (error) {
+    gst_printerrln ("error: %s", error->message);
+    g_error_free (error);
+    goto done;
+  }
+
+  app->pipeline1 = build_pipeline (app, 30);
+  app->pipeline2 = build_pipeline (app, 40);
+
+  gst_element_set_state (app->pipeline1, GST_STATE_PLAYING);
+  gst_element_set_state (app->pipeline2, GST_STATE_PLAYING);
+
+  g_main_loop_run (app->loop);
+
+  gst_element_set_state (app->pipeline1, GST_STATE_NULL);
+  gst_element_set_state (app->pipeline2, GST_STATE_NULL);
+
+  gst_object_unref (app->pipeline1);
+  gst_object_unref (app->pipeline2);
+
+done:
+  if (app->thread)
+    g_thread_join (app->thread);
+
+  if (app->compositor)
+    wl_compositor_destroy (app->compositor);
+  if (app->registry)
+    wl_registry_destroy (app->registry);
+  if (app->queue)
+    wl_event_queue_destroy (app->queue);
+  if (app->display_wrapper)
+    wl_proxy_wrapper_destroy (app->display_wrapper);
+  if (app->display) {
+    wl_display_flush (app->display);
+    wl_display_disconnect (app->display);
+  }
+  g_slice_free (App, app);
+  return 0;
+}