1 /* GStreamer
2 * Copyright (C) <2010> Alexander Bokovoy <ab@samba.org>
3 *
4 * qtgv-xoverlay: demonstrate overlay handling using qt graphics view
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 */
21
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25
26 #include "qtgv-videooverlay.h"
27
28 #include <QApplication>
29 #include <QTimer>
30
31 #include <gst/video/videooverlay.h>
32
SinkPipeline(QGraphicsView * parent)33 SinkPipeline::SinkPipeline(QGraphicsView *parent) : QObject(parent)
34 {
35 GstStateChangeReturn sret;
36
37 pipeline = gst_pipeline_new ("xvoverlay");
38 src = gst_element_factory_make ("videotestsrc", NULL);
39
40 if ((sink = gst_element_factory_make ("xvimagesink", NULL))) {
41 sret = gst_element_set_state (sink, GST_STATE_READY);
42 if (sret != GST_STATE_CHANGE_SUCCESS) {
43 gst_element_set_state (sink, GST_STATE_NULL);
44 gst_object_unref (sink);
45 }
46 } else if ((sink = gst_element_factory_make ("ximagesink", NULL))) {
47 sret = gst_element_set_state (sink, GST_STATE_READY);
48 if (sret != GST_STATE_CHANGE_SUCCESS) {
49 gst_element_set_state (sink, GST_STATE_NULL);
50 gst_object_unref (sink);
51 }
52 } else if (strcmp (DEFAULT_VIDEOSINK, "xvimagesink") != 0 &&
53 strcmp (DEFAULT_VIDEOSINK, "ximagesink") != 0) {
54 if ((sink = gst_element_factory_make (DEFAULT_VIDEOSINK, NULL))) {
55 if (!GST_IS_BIN (sink)) {
56 sret = gst_element_set_state (sink, GST_STATE_READY);
57 if (sret != GST_STATE_CHANGE_SUCCESS) {
58 gst_element_set_state (sink, GST_STATE_NULL);
59 gst_object_unref (sink);
60 sink = NULL;
61 }
62 } else {
63 gst_object_unref (sink);
64 sink = NULL;
65 }
66 }
67 }
68
69 if (sink == NULL)
70 g_error ("Couldn't find a working video sink.");
71
72 gst_bin_add_many (GST_BIN (pipeline), src, sink, NULL);
73 gst_element_link (src, sink);
74 xwinid = parent->winId();
75 }
76
~SinkPipeline()77 SinkPipeline::~SinkPipeline()
78 {
79 gst_element_set_state (pipeline, GST_STATE_NULL);
80 gst_object_unref (pipeline);
81 }
82
startPipeline()83 void SinkPipeline::startPipeline()
84 {
85 GstStateChangeReturn sret;
86
87 /* we know what the video sink is in this case (xvimagesink), so we can
88 * just set it directly here now (instead of waiting for a
89 * prepare-window-handle element message in a sync bus handler and setting
90 * it there) */
91 gst_video_overlay_set_window_handle (GST_VIDEO_OVERLAY (sink), xwinid);
92
93 sret = gst_element_set_state (pipeline, GST_STATE_PLAYING);
94 if (sret == GST_STATE_CHANGE_FAILURE) {
95 gst_element_set_state (pipeline, GST_STATE_NULL);
96 gst_object_unref (pipeline);
97 /* Exit application */
98 QTimer::singleShot(0, QApplication::activeWindow(), SLOT(quit()));
99 }
100 }
101
main(int argc,char ** argv)102 int main( int argc, char **argv )
103 {
104 QApplication app(argc, argv);
105
106 QGraphicsScene scene;
107 scene.setSceneRect( -100.0, -100.0, 200.0, 200.0 );
108
109 QGraphicsView view( &scene );
110 view.resize(320, 240);
111 view.setWindowTitle("GstVideoOverlay Qt GraphicsView demo");
112 view.show();
113
114 gst_init (&argc, &argv);
115 SinkPipeline pipeline(&view);
116 pipeline.startPipeline();
117
118 int ret = app.exec();
119
120 view.hide();
121
122 return ret;
123 }
124