在Weston下运行GTK窗口中嵌入的Gstreamer视频

#include <gtk/gtk.h>
#include <gst/gst.h>
#include <gst/video/videooverlay.h>

static void on_realize(GtkWidget *widget, gpointer data) {
  GstElement *pipeline;
  GstElement *videoSink;
  GstBus *bus;
  guint bus_watch_id;

  // 初始化GStreamer
  gst_init(NULL, NULL);

  // 创建GStreamer pipeline
  pipeline = gst_parse_launch("videotestsrc ! autovideosink", NULL);

  // 获取video sink元素
  videoSink = gst_bin_get_by_interface(GST_BIN(pipeline), GST_TYPE_VIDEO_OVERLAY);

  // 设置video sink的窗口
  gst_video_overlay_set_window_handle(GST_VIDEO_OVERLAY(videoSink), GDK_WINDOW_XID(gtk_widget_get_window(widget)));

  // 启动pipeline
  gst_element_set_state(pipeline, GST_STATE_PLAYING);

  // 监听GStreamer消息
  bus = gst_element_get_bus(pipeline);
  bus_watch_id = gst_bus_add_watch(bus, bus_callback, loop);
  gst_object_unref(bus);
}

int main(int argc, char *argv[]) {
  GtkWidget *window;

  // 初始化GTK
  gtk_init(&argc, &argv);

  // 创建窗口
  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_window_set_default_size(GTK_WINDOW(window), 640, 480);

  // 监听窗口的实现事件
  g_signal_connect(window, "realize", G_CALLBACK(on_realize), NULL);

  // 显示窗口
  gtk_widget_show_all(window);

  // 进入GTK主循环
  gtk_main();

  return 0;
}