how does a (custom) elements specific data get initialised ?

Michael Gruner michael.gruner at
Tue Mar 1 15:03:47 UTC 2022

Hey Tom

GStreamer elements are GObjects under the hood. Here’s a summary of the GObject lifycicle: <>

The constructor you’re looking for is gst_my_filter_init(). You want to initialize your struct there (or call your constructor).


> On 1 Mar 2022, at 04:32, tom via gstreamer-devel <gstreamer-devel at> wrote:
> In <>
> there is a structure that contains information of a particular instance of an element:
> (GstMyFilter)
> which later on in the tutorial gets used in for example:
> static gboolean
> gst_my_filter_sink_event (GstPad    *pad,
>                   GstObject *parent,
>                   GstEvent  *event)
> {
>   GstMyFilter *filter = GST_MY_FILTER (parent);
> but where does the structure 'GstMyFilter' get initialised ?
> I'm asking because i've added a default constructor in my structure, but it never gets called, but somehow the structure is initialised with 0's 
> how can I ensure that the data structure's constructor is used ?
> kind regards,
> tom

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