gstreamer/tests/examples/qt/qmlsink-dynamically-added/main.cpp

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#include <QApplication>
#include <QQmlApplicationEngine>
#include <QQuickWindow>
#include <QQuickItem>
#include <QRunnable>
#include <QTimer>
#include <gst/gst.h>
#include <gst/gl/gl.h>
static GstBusSyncReply
on_sync_bus_message (GstBus * bus, GstMessage * msg, gpointer data)
{
GstElement *pipeline = (GstElement *) data;
switch (GST_MESSAGE_TYPE (msg)) {
case GST_MESSAGE_HAVE_CONTEXT: {
GstContext *context;
gst_message_parse_have_context (msg, &context);
/* if you need specific behviour or a context from a specific element,
* you need to be selective about which context's you set on the
* pipeline */
if (gst_context_has_context_type (context, GST_GL_DISPLAY_CONTEXT_TYPE)) {
gst_println ("got have-context %p", context);
gst_element_set_context (pipeline, context);
}
if (context)
gst_context_unref (context);
gst_message_unref (msg);
return GST_BUS_DROP;
}
default:
break;
}
return GST_BUS_PASS;
}
static void
connect_tee (GstElement * tee, GstElement * queue)
{
gst_println ("attaching tee/queue %p %p", tee, queue);
gst_element_link (tee, queue);
}
static void
connect_qmlglsink (GstElement * pipeline, GstElement * tee, QQuickWindow * rootObject)
{
GstElement *queue = gst_element_factory_make ("queue", NULL);
GstElement *qmlglsink = gst_element_factory_make ("qmlglsink", NULL);
QQuickItem *videoItem;
gst_println ("attaching qmlglsink %s at %p", GST_OBJECT_NAME (qmlglsink), qmlglsink);
gst_bin_add (GST_BIN (pipeline), queue);
gst_bin_add (GST_BIN (pipeline), qmlglsink);
gst_element_link (queue, qmlglsink);
gst_element_set_state (queue, GST_STATE_PLAYING);
videoItem = rootObject->findChild<QQuickItem *> ("videoItem");
g_assert (videoItem);
g_object_set (qmlglsink, "widget", videoItem, NULL);
gst_element_set_state (qmlglsink, GST_STATE_PAUSED);
connect_tee (tee, queue);
gst_element_set_state (qmlglsink, GST_STATE_PLAYING);
}
int main(int argc, char *argv[])
{
int ret;
gst_init (&argc, &argv);
{
QGuiApplication app(argc, argv);
/* test a whole bunch of elements respect the change in display
* and therefore OpenGL context */
GstElement *pipeline = gst_parse_launch ("gltestsrc ! "
"capsfilter caps=video/x-raw(ANY),framerate=10/1 ! glupload ! "
"glcolorconvert ! glalpha noise-level=16 method=green angle=40 ! "
"glcolorbalance hue=0.25 ! gltransformation rotation-x=30 ! "
"glvideomixerelement ! glviewconvert output-mode-override=side-by-side ! "
"glstereosplit name=s "
"glstereomix name=m ! tee name=t ! queue ! fakesink sync=true "
"s.left ! queue ! m.sink_0 "
"s.right ! queue ! m.sink_1", NULL);
GstBus *bus = gst_element_get_bus (pipeline);
gst_bus_set_sync_handler (bus, on_sync_bus_message, pipeline, NULL);
gst_object_unref (bus);
/* the plugin must be loaded before loading the qml file to register the
* GstGLVideoItem qml item */
GstElement *sink = gst_element_factory_make ("qmlglsink", NULL);
g_assert (pipeline && sink);
gst_object_unref (sink);
QQuickWindow *rootObject;
/* The Qml scene starts out with the widget not connected to any qmlglsink
* element */
QQmlApplicationEngine engine;
engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
/* find and set the videoItem on the sink */
rootObject = static_cast<QQuickWindow *> (engine.rootObjects().first());
gst_element_set_state (pipeline, GST_STATE_PLAYING);
GstElement *t = gst_bin_get_by_name (GST_BIN (pipeline), "t");
gst_object_unref (t); /* ref held by pipeline */
/* add the qmlglsink element */
QTimer::singleShot(5000, [pipeline, t, rootObject]() { connect_qmlglsink (pipeline, t, rootObject); } );
ret = app.exec();
gst_element_set_state (pipeline, GST_STATE_NULL);
gst_object_unref (pipeline);
}
gst_deinit ();
return ret;
}