Use GStreamer with Qt

tham

Using GStreamer with Qt, so far so good if do not work with gui.
GStreamer with the event loop by default, that means if I do not want to let the GStreamer block my main thread, the solution I got is

sleep periodic in the while loop
Use QTimer to pop the message out from the main thread
Create a QThread, pass the pointer of bus into the class, execute the while loop in the thread and emit the signal when receive message

I prefer solution 3
Qt-GStreamer is not a choice since this project is dead. Thanks

Supplement:

1.I init the gstreamer in main function, before QApplication

gst_init (&argc, &argv);
QApplication app(argc, argv);

Intent to create a class inherit QThread and execute the while loop in the run function

do {
        unique_gst_msg msg(gst_bus_timed_pop_filtered (bus.get(), GST_CLOCK_TIME_NONE,
                                                       GstMessageType(GST_MESSAGE_STATE_CHANGED | GST_MESSAGE_ERROR | GST_MESSAGE_EOS)));

        //cout<<"Parse message"<<endl;
        if(msg){
            GError *err;
            gchar *debug_info;

            switch (GST_MESSAGE_TYPE (msg.get())) {
            case GST_MESSAGE_ERROR:
                emit message_error(.....)
            default:
                cout<<"We should not reach here"<<endl;
                g_printerr ("Unexpected message received.\n");
                break;
            }
        }
    } while(!terminate);

ps : Looks like only the bus need to rely on the event loop of glib?

kuzulis

You can look how it is implemented e.g. in QtMM module.