Re: Gstreamermm using C Plugins

[Marcin Kolny <marcin kolny gmail com>]

Hi Franz,

You should be able to use any plugin from gstreamermm. Please have a look at the examples in the gstreamermm repository, for example the oggplayer [1]. As you can see there, we create filesrc element using ElementFactory class, which returns an object of type Gst::Element:

Glib::RefPtr<Gst::Element> source = Gst::ElementFactory::create_element("filesrc");

This object has bunch of methods, and the one you might be interested in is set_property which is equivalent to g_object_set and allows you setting property values, e.g.

source->set_property("location", "/my/file.mp4");

Please let me know if you have any questions

[1] https://gitlab.gnome.org/GNOME/gstreamermm/-/blob/master/examples/ogg_player/main.cc#L183

czw., 29 paź 2020 o 10:31 Franz Bender via gtkmm-list <gtkmm-list gnome org> napisał(a):

Dear gtkmm-Community,

I’m working on a C++ project involving GStreamer, which is why I use gstreamermm as a C++ bridge. My problem is that I have to interface with a gstreamer plugin which is not wrapped by gstreamermm. I was unable to figure out how to implement this into my pipeline.

Specifically I want to use NVidias nvinfer plugin (which is part of their deepstream-neural-network-efforts) in a C++ tool. What is the preferred way of adding these C-plugins to a Cpp-Gstreamermm Pipeline and setting their properties? Would I use the Gst::ElementFactory to create the Element?

I would really appreciate a tiny example on how I could add a C plugin to this minimal pipeline example:



Glib::RefPtr<Glib::MainLoop> mainLoop;
Glib::RefPtr<Gst::Pipeline> pipeline;

Gst::init();
mainLoop = Glib::MainLoop::create();
pipeline = Gst::Pipeline::create("Pipeline“);

// Add a pure C plugin, set a property to a value
// and maybe connect a signal

pipeline->set_state(Gst::STATE_PLAYING);
mainLoop->run();



Many thanks in advance for your efforts!

Best regards from Berlin,
Franz :)
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Marcin Kolny