gstreamer/examples/autoplug/autoplug.c

#include <gst/gst.h>
#include <gnome.h>

static void
gst_play_have_type (GstElement *typefind, GstCaps *caps, GstElement *pipeline)
{
  GstElement *osssink, *videosink;
  GtkWidget *appwindow;
  GstElement *new_element;
  GstAutoplug *autoplug;
  GtkWidget *socket;
  GstElement *autobin;
  GstElement *disksrc;
  GstElement *cache;

  GST_DEBUG (0,"GstPipeline: play have type\n");

  gst_element_set_state (pipeline, GST_STATE_PAUSED);

  disksrc = gst_bin_get_by_name (GST_BIN (pipeline), "disk_source");
  autobin = gst_bin_get_by_name (GST_BIN (pipeline), "autobin");
  cache = gst_bin_get_by_name (GST_BIN (autobin), "cache");

  // disconnect the typefind from the pipeline and remove it
  gst_element_disconnect (cache, "src", typefind, "sink");
  gst_bin_remove (GST_BIN (autobin), typefind);
      
  /* and an audio sink */
  osssink = gst_elementfactory_make("osssink", "play_audio");
  g_assert(osssink != NULL);

  /* and an video sink */
  videosink = gst_elementfactory_make("xvideosink", "play_video");
  g_assert(videosink != NULL);

  autoplug = gst_autoplugfactory_make ("staticrender");
  g_assert (autoplug != NULL);

  new_element = gst_autoplug_to_renderers (autoplug,
           caps,
           videosink,
           osssink,
           NULL);

  if (!new_element) {
    g_print ("could not autoplug, no suitable codecs found...\n");
    exit (-1);
  }

  gst_element_set_name (new_element, "new_element");

  gst_bin_add (GST_BIN (autobin), new_element);

  gtk_object_set (GTK_OBJECT (cache), "reset", TRUE, NULL);

  gst_element_connect (cache, "src", new_element, "sink");

  appwindow = gnome_app_new ("autoplug demo","autoplug demo");

  socket = gtk_socket_new ();
  gtk_widget_show (socket);

  gnome_app_set_contents (GNOME_APP (appwindow),
    		GTK_WIDGET (socket));

  gtk_widget_realize (socket);
  gtk_socket_steal (GTK_SOCKET (socket), 
		    gst_util_get_int_arg (GTK_OBJECT (videosink), "xid"));

  gtk_widget_show_all (appwindow);

  gst_element_set_state (pipeline, GST_STATE_PLAYING);
      
  xmlSaveFile("xmlTest.gst", gst_xml_write (GST_ELEMENT (pipeline)));
}

gboolean 
idle_func (gpointer data)
{
  return gst_bin_iterate (GST_BIN (data));
}

static void
gst_play_cache_empty (GstElement *element, GstElement *pipeline)
{
  GstElement *autobin;
  GstElement *disksrc;
  GstElement *cache;
  GstElement *new_element;

  fprintf (stderr, "have cache empty\n");

  gst_element_set_state (pipeline, GST_STATE_PAUSED);

  disksrc = gst_bin_get_by_name (GST_BIN (pipeline), "disk_source");
  autobin = gst_bin_get_by_name (GST_BIN (pipeline), "autobin");
  cache = gst_bin_get_by_name (GST_BIN (autobin), "cache");
  new_element = gst_bin_get_by_name (GST_BIN (autobin), "new_element");

  gst_element_disconnect (disksrc, "src", cache, "sink");
  gst_element_disconnect (cache, "src", new_element, "sink");
  gst_bin_remove (GST_BIN (autobin), cache);
  gst_element_connect (disksrc, "src", new_element, "sink");

  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  fprintf (stderr, "done with cache_empty\n");
}

int main(int argc,char *argv[]) 
{
  GstElement *disksrc;
  GstElement *pipeline;
  GstElement *autobin;
  GstElement *typefind;
  GstElement *cache;

  g_thread_init(NULL);
  gst_init(&argc,&argv);
  gnome_init("autoplug","0.0.1", argc,argv);

  if (argc != 2) {
    g_print("usage: %s <filename>\n", argv[0]);
    exit(-1);
  }

  /* create a new pipeline to hold the elements */
  pipeline = gst_pipeline_new("pipeline");
  g_assert(pipeline != NULL);

  /* create a disk reader */
  disksrc = gst_elementfactory_make("disksrc", "disk_source");
  g_assert(disksrc != NULL);
  gtk_object_set(GTK_OBJECT(disksrc),"location", argv[1],NULL);
  gst_bin_add (GST_BIN (pipeline), disksrc);

  autobin = gst_bin_new ("autobin");
  cache = gst_elementfactory_make ("autoplugcache", "cache");
  gtk_signal_connect (GTK_OBJECT (cache), "cache_empty", GTK_SIGNAL_FUNC (gst_play_cache_empty), pipeline);

  typefind = gst_elementfactory_make ("typefind", "typefind");
  gtk_signal_connect (GTK_OBJECT (typefind), "have_type", GTK_SIGNAL_FUNC (gst_play_have_type), pipeline);
  gst_bin_add (GST_BIN (autobin), cache);
  gst_bin_add (GST_BIN (autobin), typefind);

  gst_element_connect (cache, "src", typefind, "sink");
  gst_element_add_ghost_pad (autobin, gst_element_get_pad (cache, "sink"), "sink");

  gst_bin_add (GST_BIN( pipeline), autobin);
  gst_element_connect (disksrc, "src", autobin, "sink");

  /* start playing */
  gst_element_set_state( GST_ELEMENT (pipeline), GST_STATE_PLAYING);

  gtk_idle_add (idle_func, pipeline);
  gst_main ();

  /* stop the pipeline */
  gst_element_set_state (GST_ELEMENT (pipeline), GST_STATE_NULL);

  gst_object_unref (GST_OBJECT (pipeline));

  exit(0);
}