/* GStreamer

 * Copyright (C) <2005> Julien Moutte <julien@moutte.net>

 *

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <gst/gst.h>

#include <gst/interfaces/xoverlay.h>

#include <X11/Xlib.h>

#include <X11/Xutil.h>

#include <math.h>

#include <sys/time.h>

static GMainLoop *loop;

static Display *disp;

static Window root, win = 0;

static GC gc;

static gint width = 320, height = 240, x = 0, y = 0;

static gint disp_width, disp_height;

static inline long

myclock (void)

{

  struct timeval tv;

  gettimeofday (&tv, NULL);

  return (tv.tv_sec * 1000 + tv.tv_usec / 1000);

}

static void

open_display (void)

{

  gint screen_num;

  disp = XOpenDisplay (NULL);

  root = DefaultRootWindow (disp);

  screen_num = DefaultScreen (disp);

  disp_width = DisplayWidth (disp, screen_num);

  disp_height = DisplayHeight (disp, screen_num);

}

static void

close_display (void)

{

  XCloseDisplay (disp);

}

static gboolean

resize_window (GstPipeline * pipeline)

{

  width = (sin (myclock () / 300.0) * 200) + 640;

  height = (sin (myclock () / 300.0) * 200) + 480;

  XResizeWindow (disp, win, width, height);

  XSync (disp, FALSE);

  return TRUE;

}

static gboolean

move_window (GstPipeline * pipeline)

{

  x += 5;

  y = disp_height - height + (sin (myclock () / 300.0) * height);

  if (x > disp_width)

    x = 0;

  XMoveWindow (disp, win, x, y);

  XSync (disp, FALSE);

  return TRUE;

}

static gboolean

toggle_events (GstXOverlay * ov)

{

  static gboolean events_toggled;

  gst_x_overlay_handle_events (ov, events_toggled);

  if (events_toggled) {

    g_print ("Events are handled\n");

    events_toggled = FALSE;

  } else {

    g_print ("Events are NOT handled\n");

    events_toggled = TRUE;

  }

  return TRUE;

}

static gboolean

cycle_window (GstXOverlay * ov)

{

  XGCValues values;

  Window old_win = win;

  GC old_gc = gc;

  win = XCreateSimpleWindow (disp, root, 0, 0, width, height, 0, 0, 0);

  XSetWindowBackgroundPixmap (disp, win, None);

  gc = XCreateGC (disp, win, 0, &values);

  XMapRaised (disp, win);

  XSync (disp, FALSE);

  gst_x_overlay_set_xwindow_id (ov, win);

  if (old_win) {

    XDestroyWindow (disp, old_win);

    XFreeGC (disp, old_gc);

    XSync (disp, FALSE);

  }

  return TRUE;

}

static GstBusSyncReply

create_window (GstBus * bus, GstMessage * message, GstPipeline * pipeline)

{

  const GstStructure *s;

  GstXOverlay *ov = NULL;

  s = gst_message_get_structure (message);

  if (!gst_structure_has_name (s, "prepare-xwindow-id")) {

    return GST_BUS_PASS;

  }

  ov = GST_X_OVERLAY (GST_MESSAGE_SRC (message));

  g_print ("Creating our own window\n");

  cycle_window (ov);

  g_timeout_add (50, (GSourceFunc) resize_window, pipeline);

  g_timeout_add (50, (GSourceFunc) move_window, pipeline);

  g_timeout_add (100, (GSourceFunc) cycle_window, ov);

  g_timeout_add (2000, (GSourceFunc) toggle_events, ov);

  return GST_BUS_DROP;

}

#if 0

static gboolean

terminate_playback (GstElement * pipeline)

{

  g_print ("Terminating playback\n");

  g_main_loop_quit (loop);

  return FALSE;

}

#endif

static gboolean

pause_playback (GstElement * pipeline)

{

  g_print ("Pausing playback\n");

  gst_element_set_state (pipeline, GST_STATE_PAUSED);

  return FALSE;

}

static gboolean

start_playback (GstElement * pipeline)

{

  g_print ("Starting playback\n");

  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  return FALSE;

}

int

main (int argc, char **argv)

{

  GstElement *pipeline;

  GstBus *bus;

#ifndef GST_DISABLE_PARSE

  GError *error = NULL;

#endif

  gst_init (&argc, &argv);

  if (argc != 2) {

    g_print ("Usage: %s \"pipeline description with launch format\"\n",

        argv[0]);

    g_print ("The pipeline should contain an element implementing XOverlay.\n");

    g_print ("Example: %s \"videotestsrc ! ximagesink\"\n", argv[0]);

    return -1;

  }

#ifdef GST_DISABLE_PARSE

  g_print ("GStreamer was built without pipeline parsing capabilities.\n");

  g_print

      ("Please rebuild GStreamer with pipeline parsing capabilities activated to use this example.\n");

  return 1;

#else

  pipeline = gst_parse_launch (argv[1], &error);

  if (error) {

    g_print ("Error while parsing pipeline description: %s\n", error->message);

    return -1;

  }

#endif

  loop = g_main_loop_new (NULL, FALSE);

  open_display ();

  bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));

  gst_bus_set_sync_handler (bus, (GstBusSyncHandler) create_window, pipeline);

  gst_element_set_state (pipeline, GST_STATE_PLAYING);

  /* We want to get out after */

  //g_timeout_add (500000, (GSourceFunc) terminate_playback, pipeline);

  g_timeout_add (10000, (GSourceFunc) pause_playback, pipeline);

  g_timeout_add (20000, (GSourceFunc) start_playback, pipeline);

  g_main_loop_run (loop);

  close_display ();

  g_main_loop_unref (loop);

  return 0;

}