1/****************************************************************************
2**
3** Copyright (C) 2016 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "qgstreamervideorenderer_p.h"
41#include <private/qvideosurfacegstsink_p.h>
42#include <private/qgstutils_p.h>
43#include <qabstractvideosurface.h>
44#include <QtCore/qdebug.h>
45
46#include <gst/gst.h>
47
48static inline void resetSink(GstElement *&element, GstElement *v = nullptr)
49{
50 if (element)
51 gst_object_unref(GST_OBJECT(element));
52
53 if (v)
54 qt_gst_object_ref_sink(GST_OBJECT(v));
55
56 element = v;
57}
58
59QGstreamerVideoRenderer::QGstreamerVideoRenderer(QObject *parent)
60 : QVideoRendererControl(parent)
61{
62}
63
64QGstreamerVideoRenderer::~QGstreamerVideoRenderer()
65{
66 resetSink(element&: m_videoSink);
67}
68
69void QGstreamerVideoRenderer::setVideoSink(GstElement *sink)
70{
71 if (!sink)
72 return;
73
74 resetSink(element&: m_videoSink, v: sink);
75 emit sinkChanged();
76}
77
78GstElement *QGstreamerVideoRenderer::videoSink()
79{
80 if (!m_videoSink && m_surface) {
81 auto sink = reinterpret_cast<GstElement *>(QVideoSurfaceGstSink::createSink(surface: m_surface));
82 resetSink(element&: m_videoSink, v: sink);
83 }
84
85 return m_videoSink;
86}
87
88void QGstreamerVideoRenderer::stopRenderer()
89{
90 if (m_surface)
91 m_surface->stop();
92}
93
94QAbstractVideoSurface *QGstreamerVideoRenderer::surface() const
95{
96 return m_surface;
97}
98
99void QGstreamerVideoRenderer::setSurface(QAbstractVideoSurface *surface)
100{
101 if (m_surface != surface) {
102 resetSink(element&: m_videoSink);
103
104 if (m_surface) {
105 disconnect(sender: m_surface.data(), SIGNAL(supportedFormatsChanged()),
106 receiver: this, SLOT(handleFormatChange()));
107 }
108
109 bool wasReady = isReady();
110
111 m_surface = surface;
112
113 if (m_surface) {
114 connect(sender: m_surface.data(), SIGNAL(supportedFormatsChanged()),
115 receiver: this, SLOT(handleFormatChange()));
116 }
117
118 if (wasReady != isReady())
119 emit readyChanged(isReady());
120
121 emit sinkChanged();
122 }
123}
124
125void QGstreamerVideoRenderer::handleFormatChange()
126{
127 setVideoSink(nullptr);
128}
129

source code of qtmultimedia/src/gsttools/qgstreamervideorenderer.cpp