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test/qml: add an dynamically adding qmlglsink element
The example shows how to add qmlglsink to an already running pipeline with pre-existing OpenGL elements.
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subdir('qmlsink')
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subdir('qmlsink')
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subdir('qmlsink-dynamically-added')
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subdir('qmlsrc')
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subdir('qmlsrc')
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4
tests/examples/qt/qmlsink-dynamically-added/.gitignore
vendored
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4
tests/examples/qt/qmlsink-dynamically-added/.gitignore
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deployment.pri
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play
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qrc_qmlsink.cpp
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*.o
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127
tests/examples/qt/qmlsink-dynamically-added/main.cpp
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127
tests/examples/qt/qmlsink-dynamically-added/main.cpp
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#include <QApplication>
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#include <QQmlApplicationEngine>
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#include <QQuickWindow>
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#include <QQuickItem>
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#include <QRunnable>
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#include <QTimer>
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#include <gst/gst.h>
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#include <gst/gl/gl.h>
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static GstBusSyncReply
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on_sync_bus_message (GstBus * bus, GstMessage * msg, gpointer data)
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{
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GstElement *pipeline = (GstElement *) data;
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switch (GST_MESSAGE_TYPE (msg)) {
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case GST_MESSAGE_HAVE_CONTEXT: {
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GstContext *context;
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gst_message_parse_have_context (msg, &context);
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/* if you need specific behviour or a context from a specific element,
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* you need to be selective about which context's you set on the
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* pipeline */
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if (gst_context_has_context_type (context, GST_GL_DISPLAY_CONTEXT_TYPE)) {
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gst_println ("got have-context %p", context);
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gst_element_set_context (pipeline, context);
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}
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if (context)
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gst_context_unref (context);
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gst_message_unref (msg);
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return GST_BUS_DROP;
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}
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default:
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break;
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}
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return GST_BUS_PASS;
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}
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static void
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connect_tee (GstElement * tee, GstElement * queue)
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{
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gst_println ("attaching tee/queue %p %p", tee, queue);
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gst_element_link (tee, queue);
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}
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static void
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connect_qmlglsink (GstElement * pipeline, GstElement * tee, QQuickWindow * rootObject)
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{
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GstElement *queue = gst_element_factory_make ("queue", NULL);
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GstElement *qmlglsink = gst_element_factory_make ("qmlglsink", NULL);
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QQuickItem *videoItem;
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gst_println ("attaching qmlglsink %s at %p", GST_OBJECT_NAME (qmlglsink), qmlglsink);
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gst_bin_add (GST_BIN (pipeline), queue);
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gst_bin_add (GST_BIN (pipeline), qmlglsink);
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gst_element_link (queue, qmlglsink);
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gst_element_set_state (queue, GST_STATE_PLAYING);
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videoItem = rootObject->findChild<QQuickItem *> ("videoItem");
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g_assert (videoItem);
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g_object_set (qmlglsink, "widget", videoItem, NULL);
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gst_element_set_state (qmlglsink, GST_STATE_PAUSED);
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connect_tee (tee, queue);
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gst_element_set_state (qmlglsink, GST_STATE_PLAYING);
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}
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int main(int argc, char *argv[])
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{
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int ret;
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gst_init (&argc, &argv);
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{
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QGuiApplication app(argc, argv);
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/* test a whole bunch of elements respect the change in display
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* and therefore OpenGL context */
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GstElement *pipeline = gst_parse_launch ("gltestsrc ! "
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"capsfilter caps=video/x-raw(ANY),framerate=10/1 ! glupload ! "
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"glcolorconvert ! glalpha noise-level=16 method=green angle=40 ! "
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"glcolorbalance hue=0.25 ! gltransformation rotation-x=30 ! "
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"glvideomixerelement ! glviewconvert output-mode-override=side-by-side ! "
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"glstereosplit name=s "
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"glstereomix name=m ! tee name=t ! queue ! fakesink sync=true "
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"s.left ! queue ! m.sink_0 "
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"s.right ! queue ! m.sink_1", NULL);
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GstBus *bus = gst_element_get_bus (pipeline);
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gst_bus_set_sync_handler (bus, on_sync_bus_message, pipeline, NULL);
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gst_object_unref (bus);
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/* the plugin must be loaded before loading the qml file to register the
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* GstGLVideoItem qml item */
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GstElement *sink = gst_element_factory_make ("qmlglsink", NULL);
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g_assert (pipeline && sink);
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gst_object_unref (sink);
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QQuickWindow *rootObject;
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/* The Qml scene starts out with the widget not connected to any qmlglsink
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* element */
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QQmlApplicationEngine engine;
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engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
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/* find and set the videoItem on the sink */
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rootObject = static_cast<QQuickWindow *> (engine.rootObjects().first());
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gst_element_set_state (pipeline, GST_STATE_PLAYING);
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GstElement *t = gst_bin_get_by_name (GST_BIN (pipeline), "t");
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gst_object_unref (t); /* ref held by pipeline */
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/* add the qmlglsink element */
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QTimer::singleShot(5000, [pipeline, t, rootObject]() { connect_qmlglsink (pipeline, t, rootObject); } );
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ret = app.exec();
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gst_element_set_state (pipeline, GST_STATE_NULL);
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gst_object_unref (pipeline);
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}
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gst_deinit ();
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return ret;
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}
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60
tests/examples/qt/qmlsink-dynamically-added/main.qml
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60
tests/examples/qt/qmlsink-dynamically-added/main.qml
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import QtQuick 2.4
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import QtQuick.Controls 1.1
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import QtQuick.Controls.Styles 1.3
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import QtQuick.Dialogs 1.2
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import QtQuick.Window 2.1
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import org.freedesktop.gstreamer.GLVideoItem 1.0
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ApplicationWindow {
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id: window
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visible: true
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width: 640
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height: 480
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x: 30
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y: 30
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color: "black"
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Item {
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anchors.fill: parent
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GstGLVideoItem {
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id: video
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objectName: "videoItem"
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anchors.centerIn: parent
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width: parent.width
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height: parent.height
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}
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Rectangle {
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color: Qt.rgba(1, 1, 1, 0.7)
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border.width: 1
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border.color: "white"
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anchors.bottom: video.bottom
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anchors.bottomMargin: 15
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anchors.horizontalCenter: parent.horizontalCenter
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width : parent.width - 30
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height: parent.height - 30
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radius: 8
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MouseArea {
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id: mousearea
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anchors.fill: parent
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hoverEnabled: true
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onEntered: {
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parent.opacity = 1.0
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hidetimer.start()
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}
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}
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Timer {
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id: hidetimer
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interval: 5000
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onTriggered: {
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parent.opacity = 0.0
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stop()
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}
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}
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}
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}
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}
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20
tests/examples/qt/qmlsink-dynamically-added/meson.build
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tests/examples/qt/qmlsink-dynamically-added/meson.build
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sources = [
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'main.cpp',
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]
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if have_cxx and build_gstgl and gstgl_dep.found()
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qt5_mod = import('qt5')
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qt5qml_deps = dependency('qt5', modules : ['Core', 'Gui', 'Widgets', 'Qml', 'Quick'],
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required: get_option('examples'))
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# FIXME Add a way to get that information out of the qt5 module
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moc = find_program('moc-qt5', 'moc', required : get_option('examples'))
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if qt5qml_deps.found() and moc.found()
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qt_preprocessed = qt5_mod.preprocess(qresources : 'qmlsink.qrc')
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executable('qmlsink-dynamically-added', sources, qt_preprocessed,
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dependencies : [gst_dep, gstgl_dep, qt5qml_deps],
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c_args : gst_plugins_good_args,
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include_directories : [configinc],
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install: false)
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endif
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endif
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20
tests/examples/qt/qmlsink-dynamically-added/play.pro
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tests/examples/qt/qmlsink-dynamically-added/play.pro
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TEMPLATE = app
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QT += qml quick widgets
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QT_CONFIG -= no-pkg-config
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CONFIG += link_pkgconfig debug
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PKGCONFIG = \
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gstreamer-1.0 \
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gstreamer-video-1.0
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DEFINES += GST_USE_UNSTABLE_API
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INCLUDEPATH += ../lib
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SOURCES += main.cpp
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RESOURCES += qmlsink.qrc
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# Additional import path used to resolve QML modules in Qt Creator's code model
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QML_IMPORT_PATH =
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5
tests/examples/qt/qmlsink-dynamically-added/qmlsink.qrc
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5
tests/examples/qt/qmlsink-dynamically-added/qmlsink.qrc
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<RCC>
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<qresource prefix="/">
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<file>main.qml</file>
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</qresource>
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</RCC>
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