Subclassing GstSystemClock in Rust

[Sebastian Dröge]

On Fri, 2022-10-21 at 12:30 -0300, Rodrigo Santos via gstreamer-devel
wrote:
> Hey folks, I'm trying to create a CustomClock implementation in Rust
> that is a subclass of GstSystemClock. I found some examples of how
> one can create GstElements in Rust but none explaining how to
> subclass a GstSystemClock. 
> 
> Is it possible to create a custom clock implementation purely in
> Rust? 
> 
> The code below is the boilerplate I implemented so far. This code
> doesn't compiler, one of the error messages says: 
> 
> type ParentType = gst_sys::GstSystemClock; 
>     |                       ^^^^^^^^^^^^^^^^^^^^^^^ the trait
> `FromGlibPtrNone<*mut _>` is not implemented for `GstSystemClock`
> 
> I'm fairly new to create new GLib types and Gstreamer plugins in
> Rust, what am I missing? 

You would use `type ParentType = gst::SystemClock`. The one you
selected there is the plain C type.
In addition to that you'll also have to implement the SystemClockImpl
trait.

Once that is done, I think your code should compile like this unless I
missed something.

-- 
Sebastian Dröge, Centricular Ltd · https://www.centricular.com
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