mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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127 lines
3.9 KiB
C++
127 lines
3.9 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 <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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