notify when a device is added or removed

[Michiel Konstapel]

On 06-09-2022 07:40, 136_B4_USAMA _TAHSEEN via gstreamer-devel wrote:
>    I can get all available cameras and mics using
>    GList *devices = gst_device_monitor_get_devices(monitor);
> I want an event to be called whenever a new device is added or an 
> existing device is disconnected.
> 

I have not used the device monitor, but looking at the docs: 
https://gstreamer.freedesktop.org/documentation/gstreamer/gstdevicemonitor.html?gi-language=c#gst_device_monitor_start

"Starts monitoring the devices, one this has succeeded, the 
GST_MESSAGE_DEVICE_ADDED and GST_MESSAGE_DEVICE_REMOVED messages will be 
emitted on the bus when the list of devices changes."

So you'll have to listen for messages on the bus, which is a messaging 
system attached to the pipeline: 
https://gstreamer.freedesktop.org/documentation/application-development/basics/bus.html

HTH,
Michiel