--- /dev/null
+/* GStreamer
+ *
+ * stepping.c: stepping sample application
+ *
+ * Copyright (C) 2009 Wim Taymans <wim.taymans@gmail.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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include <stdlib.h>
+#include <math.h>
+
+#include <gst/gst.h>
+
+static GMainLoop *loop;
+
+static gdouble period = 0.0;
+
+static gboolean
+do_step (GstElement * bin)
+{
+ gdouble length;
+
+ length = sin (period);
+
+ period += M_PI / 40;
+
+ length += 1.1;
+ length *= 100 * GST_MSECOND;
+
+ gst_element_send_event (bin,
+ gst_event_new_step (GST_FORMAT_TIME, length, 1.0, TRUE, FALSE));
+
+ return FALSE;
+}
+
+static gboolean
+handle_message (GstBus * bus, GstMessage * message, gpointer data)
+{
+ GstElement *bin = GST_ELEMENT_CAST (data);
+
+ switch (message->type) {
+ case GST_MESSAGE_EOS:
+ g_message ("got EOS");
+ g_main_loop_quit (loop);
+ break;
+ case GST_MESSAGE_WARNING:
+ case GST_MESSAGE_ERROR:
+ {
+ GError *gerror;
+ gchar *debug;
+
+ if (message->type == GST_MESSAGE_ERROR)
+ gst_message_parse_error (message, &gerror, &debug);
+ else
+ gst_message_parse_warning (message, &gerror, &debug);
+
+ gst_object_default_error (GST_MESSAGE_SRC (message), gerror, debug);
+ g_error_free (gerror);
+ g_free (debug);
+ g_main_loop_quit (loop);
+ break;
+ }
+ case GST_MESSAGE_ASYNC_DONE:
+ g_timeout_add (40, (GSourceFunc) do_step, bin);
+ break;
+ default:
+ break;
+ }
+ return TRUE;
+}
+
+int
+main (int argc, char *argv[])
+{
+ GstElement *bin;
+ GstBus *bus;
+
+ gst_init (&argc, &argv);
+
+ if (argc < 2) {
+ g_print ("usage: %s <uri>\n", argv[0]);
+ return -1;
+ }
+
+ /* create a new bin to hold the elements */
+ bin = gst_element_factory_make ("playbin2", "bin");
+ g_assert (bin);
+ g_object_set (bin, "uri", argv[1], NULL);
+
+ bus = gst_pipeline_get_bus (GST_PIPELINE (bin));
+ gst_bus_add_watch (bus, handle_message, bin);
+
+ /* go to the PAUSED state and wait for preroll */
+ g_message ("prerolling first frame");
+ gst_element_set_state (bin, GST_STATE_PAUSED);
+ gst_element_get_state (bin, NULL, NULL, -1);
+
+ loop = g_main_loop_new (NULL, TRUE);
+ g_main_loop_run (loop);
+
+ g_message ("finished");
+
+ /* stop the bin */
+ gst_element_set_state (bin, GST_STATE_NULL);
+
+ g_main_loop_unref (loop);
+ gst_object_unref (bus);
+
+ exit (0);
+}