/* GStreamer

 * Copyright (C) <2010> Alexander Bokovoy <ab@samba.org>

 *

 * qtgv-xoverlay: demonstrate overlay handling using qt graphics view

 *

 * 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.

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include "qtgv-videooverlay.h"

#include <QApplication>

#include <QTimer>

#include <gst/video/videooverlay.h>

SinkPipeline::SinkPipeline(QGraphicsView *parent) : QObject(parent)

{

  GstStateChangeReturn sret;

  pipeline = gst_pipeline_new ("xvoverlay");

  src = gst_element_factory_make ("videotestsrc", NULL);

  if ((sink = gst_element_factory_make ("xvimagesink", NULL))) {

    sret = gst_element_set_state (sink, GST_STATE_READY);

    if (sret != GST_STATE_CHANGE_SUCCESS) {

      gst_element_set_state (sink, GST_STATE_NULL);

      gst_object_unref (sink);

    }

  } else if ((sink = gst_element_factory_make ("ximagesink", NULL))) {

    sret = gst_element_set_state (sink, GST_STATE_READY);

    if (sret != GST_STATE_CHANGE_SUCCESS) {

      gst_element_set_state (sink, GST_STATE_NULL);

      gst_object_unref (sink);

    }

  } else if (strcmp (DEFAULT_VIDEOSINK, "xvimagesink") != 0 &&

             strcmp (DEFAULT_VIDEOSINK, "ximagesink") != 0) {

    if ((sink = gst_element_factory_make (DEFAULT_VIDEOSINK, NULL))) {

      if (!GST_IS_BIN (sink)) {

        sret = gst_element_set_state (sink, GST_STATE_READY);

        if (sret != GST_STATE_CHANGE_SUCCESS) {

          gst_element_set_state (sink, GST_STATE_NULL);

          gst_object_unref (sink);

          sink = NULL;

        }

      } else {

        gst_object_unref (sink);

        sink = NULL;

      }

    }

  }

  if (sink == NULL)

    g_error ("Couldn't find a working video sink.");

  gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);

  gst_element_link (src, sink);

  xwinid = parent->winId();

}

SinkPipeline::~SinkPipeline()

{

  gst_element_set_state (pipeline, GST_STATE_NULL);

  gst_object_unref (pipeline);

}

void SinkPipeline::startPipeline()

{

  GstStateChangeReturn sret;

  /* we know what the video sink is in this case (xvimagesink), so we can

   * just set it directly here now (instead of waiting for a

   * prepare-window-handle element message in a sync bus handler and setting

   * it there) */

  gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (sink), xwinid);

  sret = gst_element_set_state (pipeline, GST_STATE_PLAYING);

  if (sret == GST_STATE_CHANGE_FAILURE) {

    gst_element_set_state (pipeline, GST_STATE_NULL);

    gst_object_unref (pipeline);

    /* Exit application */

    QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));

  }

}

int main( int argc, char **argv )

{

    QApplication app(argc, argv);

    QGraphicsScene scene;

    scene.setSceneRect( -100.0, -100.0, 200.0, 200.0 );

    QGraphicsView view( &scene );

    view.resize(320, 240);

    view.setWindowTitle("GstVideoOverlay Qt GraphicsView demo");

    view.show();

    gst_init (&argc, &argv);

    SinkPipeline pipeline(&view);

    pipeline.startPipeline();

    int ret = app.exec();

    view.hide();

    return ret;

}