Use gstreamer gtk signaling in QT application

monkfood

Hi i am writing a small Qt Application and part of that would be a webRTC video stream for which planned to use Gstreamer. This is where i can into problems.

Naturally my app is a QtApplication and is thus managed by Qt a processes. Now while planning the code I learned that The component webrtcbin from Gstreamer relies on GLib and the GTK signaling.

so things like g_signal_emit_by_name or g_signal_connect will run into nirvana without the GLib main loop.

Now after researching and getting a headache over this I hope that I overlooked something and that the power of the crowd-brain can help me with a hint.

An answer to any of the following would help

Is it possible to have Glib signaling inside a QT app?
Is it feasible/possible to run both main loops (QT and GLib)?
Is there a good example on how to connect a gstremer pipeline with pure webrtc (not using webrtcbin)

Christian Ehrlicher

@monkfood said in Use gstreamer gtk signaling in QT application:

g_main_loop_run

No need for this - g_main_context_iteration is enough. Otherwise QEventDispatcherGlib would somehow did not make sense when the glib functionality would not work.

Christian Ehrlicher

Normally Qt is compiled with glib support (QEventDispatcherGlib) so I don't see any problems.

monkfood

@Christian-Ehrlicher Hi, true that, but does that also mean that the signal loops are compatible? Meaning will the Glib signals work without running g_main_loop_run

Christian Ehrlicher

@monkfood said in Use gstreamer gtk signaling in QT application:

g_main_loop_run

No need for this - g_main_context_iteration is enough. Otherwise QEventDispatcherGlib would somehow did not make sense when the glib functionality would not work.

monkfood

@Christian-Ehrlicher OH that is very nice, so running the g_main_context_iteration manually in a regular Qtimer. I will try that

Christian Ehrlicher

@monkfood said in Use gstreamer gtk signaling in QT application:

so running the g_main_context_iteration manually in a regular Qtimer. I will try that

Why?
What do you think is QEventDispatcherGlib for? For handling messages from MS windows?

monkfood

@Christian-Ehrlicher to be honest, i have no idea what is about since I am unable to find any reference in the Qt Documentation. An on the web only some class diagram from Qt4. So i need to go with what I can find, learn, understand and then use.

However, I value your input a lot and will read some more in the direction of QAbstractEventDispatcher and QEventDispatcherGlib.