1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qgstreamervideooverlay_p.h"
#include <QtGui/qguiapplication.h>
#include <QtMultimedia/private/qtmultimediaglobal_p.h>
#include <common/qglist_helper_p.h>
#include <common/qgst_p.h>
#include <common/qgstreamermessage_p.h>
#include <common/qgstreamervideosink_p.h>
#include <common/qgstutils_p.h>
#include <gst/video/videooverlay.h>
QT_BEGIN_NAMESPACE
struct ElementMap
{
QStringView qtPlatform;
const char *gstreamerElement = nullptr;
};
// Ordered by descending priority
static constexpr ElementMap elementMap[] = {
{ u"xcb", "xvimagesink" },
{ u"xcb", "ximagesink" },
// wayland
{ u"wayland", "waylandsink" },
};
static bool qt_gst_element_is_functioning(QGstElement element)
{
GstStateChangeReturn ret = element.setState(GST_STATE_READY);
if (ret == GST_STATE_CHANGE_SUCCESS) {
element.setState(GST_STATE_NULL);
return true;
}
return false;
}
static QGstElement findBestVideoSink()
{
using namespace Qt::StringLiterals;
QString platform = QGuiApplication::platformName();
// First, try some known video sinks, depending on the Qt platform plugin in use.
for (const auto &i : elementMap) {
if (platform != i.qtPlatform)
continue;
QGstElement choice = QGstElement::createFromFactory(i.gstreamerElement, i.gstreamerElement);
if (choice.isNull())
continue;
if (qt_gst_element_is_functioning(choice))
return choice;
}
// We need a native window ID to use the GstVideoOverlay interface.
// Bail out if the Qt platform plugin in use cannot provide a sensible WId.
if (platform != QStringView{ u"xcb" } && platform != QStringView{ u"wayland" })
return {};
QGstElement choice;
// If none of the known video sinks are available, try to find one that implements the
// GstVideoOverlay interface and has autoplugging rank.
GList *list = qt_gst_video_sinks();
for (GstElementFactory *f : QGstUtils::GListRangeAdaptor<GstElementFactory *>(list)) {
if (!gst_element_factory_has_interface(f, "GstVideoOverlay"))
continue;
choice = QGstElement(gst_element_factory_create(f, nullptr), QGstElement::NeedsRef);
if (choice.isNull())
continue;
if (qt_gst_element_is_functioning(choice))
break;
choice = {};
}
gst_plugin_feature_list_free(list);
if (choice.isNull())
qWarning() << "Could not find a valid windowed video sink";
return choice;
}
QGstreamerVideoOverlay::QGstreamerVideoOverlay(QGstreamerVideoSink *parent, const QByteArray &elementName)
: QObject(parent)
, QGstreamerBufferProbe(QGstreamerBufferProbe::ProbeCaps)
, m_gstreamerVideoSink(parent)
{
QGstElement sink;
if (!elementName.isEmpty())
sink = QGstElement::createFromFactory(elementName.constData());
else
sink = findBestVideoSink();
setVideoSink(sink);
}
QGstreamerVideoOverlay::~QGstreamerVideoOverlay()
{
if (!m_videoSink.isNull()) {
QGstPad pad = m_videoSink.staticPad("sink");
removeProbeFromPad(pad.pad());
}
}
QGstElement QGstreamerVideoOverlay::videoSink() const
{
return m_videoSink;
}
void QGstreamerVideoOverlay::setVideoSink(QGstElement sink)
{
if (sink.isNull())
return;
m_videoSink = std::move(sink);
QGstPad pad = m_videoSink.staticPad("sink");
addProbeToPad(pad.pad());
auto *klass = G_OBJECT_GET_CLASS(m_videoSink.object());
m_hasForceAspectRatio = g_object_class_find_property(klass, "force-aspect-ratio");
m_hasFullscreen = g_object_class_find_property(klass, "fullscreen");
}
QSize QGstreamerVideoOverlay::nativeVideoSize() const
{
return m_nativeVideoSize;
}
void QGstreamerVideoOverlay::setWindowHandle(WId id)
{
m_windowId = id;
if (!m_videoSink.isNull() && GST_IS_VIDEO_OVERLAY(m_videoSink.object())) {
applyRenderRect();
// Properties need to be reset when changing the winId.
setAspectRatioMode(m_aspectRatioMode);
setFullScreen(m_fullScreen);
applyRenderRect();
}
}
void QGstreamerVideoOverlay::setRenderRectangle(const QRect &rect)
{
renderRect = rect;
applyRenderRect();
}
void QGstreamerVideoOverlay::applyRenderRect()
{
if (!m_windowId)
return;
int x = -1;
int y = -1;
int w = -1;
int h = -1;
if (!renderRect.isEmpty()) {
x = renderRect.x();
y = renderRect.y();
w = renderRect.width();
h = renderRect.height();
QSize scaledVideo = m_nativeVideoSize.scaled(w, h, m_aspectRatioMode);
x += (w - scaledVideo.width())/2;
y += (h - scaledVideo.height())/2;
w = scaledVideo.width();
h = scaledVideo.height();
}
if (!m_videoSink.isNull() && GST_IS_VIDEO_OVERLAY(m_videoSink.object()))
gst_video_overlay_set_render_rectangle(GST_VIDEO_OVERLAY(m_videoSink.object()), x, y, w, h);
}
void QGstreamerVideoOverlay::probeCaps(GstCaps *caps)
{
QSize size = QGstCaps(caps, QGstCaps::NeedsRef).at(0).resolution();
if (size != m_nativeVideoSize) {
m_nativeVideoSize = size;
m_gstreamerVideoSink->setNativeSize(m_nativeVideoSize);
applyRenderRect();
}
}
void QGstreamerVideoOverlay::setAspectRatioMode(Qt::AspectRatioMode mode)
{
m_aspectRatioMode = mode;
if (m_hasForceAspectRatio)
m_videoSink.set("force-aspect-ratio", (mode == Qt::KeepAspectRatio));
}
void QGstreamerVideoOverlay::setFullScreen(bool fullscreen)
{
m_fullScreen = fullscreen;
if (m_hasFullscreen)
m_videoSink.set("fullscreen", fullscreen);
}
bool QGstreamerVideoOverlay::processSyncMessage(const QGstreamerMessage &message)
{
if (!gst_is_video_overlay_prepare_window_handle_message(message.message()))
return false;
gst_video_overlay_set_window_handle(GST_VIDEO_OVERLAY(m_videoSink.object()), m_windowId);
return true;
}
QT_END_NAMESPACE
#include "moc_qgstreamervideooverlay_p.cpp"
|
