gstreamer/subprojects/gst-plugins-good/tests/examples/qt6/qmlmixer/main.cpp

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#include <QApplication>
#include <QQmlApplicationEngine>
#include <QQuickWindow>
#include <QQuickItem>
#include <QRunnable>
#include <QDirIterator>
#include <gst/gst.h>
class SetPlaying : public QRunnable
{
public:
SetPlaying(GstElement *);
~SetPlaying();
void run ();
private:
GstElement * pipeline_;
};
SetPlaying::SetPlaying (GstElement * pipeline)
{
this->pipeline_ = pipeline ? static_cast<GstElement *> (gst_object_ref (pipeline)) : NULL;
}
SetPlaying::~SetPlaying ()
{
if (this->pipeline_)
gst_object_unref (this->pipeline_);
}
void
SetPlaying::run ()
{
if (this->pipeline_)
gst_element_set_state (this->pipeline_, GST_STATE_PLAYING);
}
static void
on_mixer_scene_initialized (GstElement * mixer, gpointer unused)
{
QQuickItem *rootObject;
GST_INFO ("scene initialized");
g_object_get (mixer, "root-item", &rootObject, NULL);
QQuickItem *videoItem0 = rootObject->findChild<QQuickItem *> ("inputVideoItem0");
GstPad *sink0 = gst_element_get_static_pad (mixer, "sink_0");
g_object_set (sink0, "widget", videoItem0, NULL);
gst_clear_object (&sink0);
QQuickItem *videoItem1 = rootObject->findChild<QQuickItem *> ("inputVideoItem1");
GstPad *sink1 = gst_element_get_static_pad (mixer, "sink_1");
g_object_set (sink1, "widget", videoItem1, NULL);
gst_clear_object (&sink1);
}
int main(int argc, char *argv[])
{
int ret;
gst_init (&argc, &argv);
{
QGuiApplication app(argc, argv);
QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);
GstElement *pipeline = gst_pipeline_new (NULL);
GstElement *src0 = gst_element_factory_make ("videotestsrc", NULL);
GstElement *glupload0 = gst_element_factory_make ("glupload", NULL);
GstElement *src1 = gst_element_factory_make ("videotestsrc", NULL);
gst_util_set_object_arg ((GObject *) src1, "pattern", "ball");
GstElement *glupload1 = gst_element_factory_make ("glupload", NULL);
/* the plugin must be loaded before loading the qml file to register the
* GstGLVideoItem qml item */
GstElement *mixer = gst_element_factory_make ("qml6glmixer", NULL);
GstElement *sink = gst_element_factory_make ("qml6glsink", NULL);
g_assert (src0 && glupload0 && mixer && sink);
gst_bin_add_many (GST_BIN (pipeline), src0, glupload0, src1, glupload1, mixer, sink, NULL);
gst_element_link_many (src0, glupload0, mixer, sink, NULL);
gst_element_link_many (src1, glupload1, mixer, NULL);
/* load qmlglsink output */
QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
QQuickItem *videoItem;
QQuickWindow *rootObject;
/* find and set the videoItem on the sink */
rootObject = static_cast<QQuickWindow *> (engine.rootObjects().first());
videoItem = rootObject->findChild<QQuickItem *> ("videoItem");
g_assert (videoItem);
g_object_set(sink, "widget", videoItem, NULL);
QDirIterator it(":", QDirIterator::Subdirectories);
while (it.hasNext()) {
qDebug() << it.next();
}
QFile f(":/mixer.qml");
if(!f.open(QIODevice::ReadOnly)) {
qWarning() << "error: " << f.errorString();
return 1;
}
QByteArray overlay_scene = f.readAll();
qDebug() << overlay_scene;
/* load qmlgloverlay contents */
g_signal_connect (mixer, "qml-scene-initialized", G_CALLBACK (on_mixer_scene_initialized), NULL);
g_object_set (mixer, "qml-scene", overlay_scene.data(), NULL);
rootObject->scheduleRenderJob (new SetPlaying (pipeline),
QQuickWindow::BeforeSynchronizingStage);
ret = app.exec();
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
}
gst_deinit ();
return ret;
}