Handling of QoS in a BaseTransform subclass

[Jimmy De Pauw]

I am almost certain that BaseTransform ignore QoS because it does not have any segment timing to work with.
Therefore i wonder if it is possible to have QoS when the main sink is filesrc with a test file.

Considering the following pipeline :

filesrc ! decodebin ! queue ! videoconvert ! <my plugin> ! jpegenc ! multifilesink

In the debug log i have only one « gst_base_transform_chain ... we have a pending DISCONT»  but never twice.
I also never have a buffer dropped, looking at the code of GstBaseTransform i think this is because i don’t receive and segment information.

Is it possible to simulate a live feed from a video file with full QoS support so i can test my processing speed?

> On 18 Dec 2017, at 15:24, Nicolas Dufresne <nicolas at ndufresne.ca> wrote:
> 
> 
> 
> Le 18 déc. 2017 5:10 AM, "Jimmy De Pauw" <jimmy at dcode.eu <mailto:jimmy at dcode.eu>> a écrit :
> Hello,
> 
> I have been creating my own plugin using GstBaseTransform as the parent class.
> It works find but now i want to handle the QoS in my tranform method to know if i have to drop the buffer or not.
> 
> I can see that BaseTransform already listen to QoS event on its sink and set some properties in its priv structure.
> I would like to have access to the earliest_time property from my own transform method but i don’t know how to do it, if it is possible at all.
> It sounds like i have no access to it at all.
> 
> Looking at the videoconvert source code i don’t see how it handles QoS eventl.
> 
> It's entirely handled by the base class.  But you can catch the event on your srcpad, there is virtual functions for that.
> 
> 
> What is the proper way of using what is already there in the BaseTransform class to handle QoS on my own subclass?
> 
> Thanks
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