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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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3f4bfa097a
Can take multiple input streams and a qml scene and layout the input videos inside the qml scene. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4609>
127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
#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 <QDirIterator>
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#include <gst/gst.h>
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class SetPlaying : public QRunnable
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{
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public:
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SetPlaying(GstElement *);
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~SetPlaying();
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void run ();
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private:
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GstElement * pipeline_;
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};
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SetPlaying::SetPlaying (GstElement * pipeline)
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{
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this->pipeline_ = pipeline ? static_cast<GstElement *> (gst_object_ref (pipeline)) : NULL;
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}
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SetPlaying::~SetPlaying ()
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{
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if (this->pipeline_)
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gst_object_unref (this->pipeline_);
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}
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void
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SetPlaying::run ()
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{
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if (this->pipeline_)
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gst_element_set_state (this->pipeline_, GST_STATE_PLAYING);
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}
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static void
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on_mixer_scene_initialized (GstElement * mixer, gpointer unused)
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{
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QQuickItem *rootObject;
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GST_INFO ("scene initialized");
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g_object_get (mixer, "root-item", &rootObject, NULL);
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QQuickItem *videoItem0 = rootObject->findChild<QQuickItem *> ("inputVideoItem0");
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GstPad *sink0 = gst_element_get_static_pad (mixer, "sink_0");
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g_object_set (sink0, "widget", videoItem0, NULL);
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gst_clear_object (&sink0);
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QQuickItem *videoItem1 = rootObject->findChild<QQuickItem *> ("inputVideoItem1");
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GstPad *sink1 = gst_element_get_static_pad (mixer, "sink_1");
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g_object_set (sink1, "widget", videoItem1, NULL);
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gst_clear_object (&sink1);
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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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QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);
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GstElement *pipeline = gst_pipeline_new (NULL);
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GstElement *src0 = gst_element_factory_make ("videotestsrc", NULL);
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GstElement *glupload0 = gst_element_factory_make ("glupload", NULL);
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GstElement *src1 = gst_element_factory_make ("videotestsrc", NULL);
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gst_util_set_object_arg ((GObject *) src1, "pattern", "ball");
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GstElement *glupload1 = gst_element_factory_make ("glupload", NULL);
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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 *mixer = gst_element_factory_make ("qml6glmixer", NULL);
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GstElement *sink = gst_element_factory_make ("qml6glsink", NULL);
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g_assert (src0 && glupload0 && mixer && sink);
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gst_bin_add_many (GST_BIN (pipeline), src0, glupload0, src1, glupload1, mixer, sink, NULL);
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gst_element_link_many (src0, glupload0, mixer, sink, NULL);
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gst_element_link_many (src1, glupload1, mixer, NULL);
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/* load qmlglsink output */
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QQmlApplicationEngine engine;
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engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
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QQuickItem *videoItem;
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QQuickWindow *rootObject;
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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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videoItem = rootObject->findChild<QQuickItem *> ("videoItem");
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g_assert (videoItem);
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g_object_set(sink, "widget", videoItem, NULL);
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QDirIterator it(":", QDirIterator::Subdirectories);
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while (it.hasNext()) {
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qDebug() << it.next();
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}
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QFile f(":/mixer.qml");
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if(!f.open(QIODevice::ReadOnly)) {
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qWarning() << "error: " << f.errorString();
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return 1;
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}
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QByteArray overlay_scene = f.readAll();
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qDebug() << overlay_scene;
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/* load qmlgloverlay contents */
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g_signal_connect (mixer, "qml-scene-initialized", G_CALLBACK (on_mixer_scene_initialized), NULL);
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g_object_set (mixer, "qml-scene", overlay_scene.data(), NULL);
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rootObject->scheduleRenderJob (new SetPlaying (pipeline),
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QQuickWindow::BeforeSynchronizingStage);
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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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